Entries |
Document | Title | Date |
20080198634 | Resonant Dc/Dc Converter With Zero Current Switching - A resonant DC/DC converter for supplying an output power comprises a switching device ( | 08-21-2008 |
20080239761 | Forward power converter controllers - This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). | 10-02-2008 |
20080239762 | Forward power converter controllers - This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). | 10-02-2008 |
20080266908 | Control of a Resonant Converter - The invention deals with the control of a resonant LLC converter by use of control parameters. The primary current flowing in the resonant tank and a voltage at a predetermined point in the resonant tank are monitored and control parameters are set for a high side conduction interval and control parameters are set for a low side conduction interval, the control parameters for the two conduction intervals being: a peak current of the interval and a predetermined voltage of the interval. The resonant converter comprises series-arranged controllable switches to be connected to the supply source. The resonant converter is operated by setting up criteria for turning off a switch in accordance with criteria including the four control parameters. | 10-30-2008 |
20080291702 | SWITCHING POWER SUPPLY APPARATUS - In a switching power supply apparatus, an inductor, a transformer, a first switching circuit, a second switching circuit, and a capacitor are connected to each other so that a first switching element and a second switching element can be alternately turned on and off, an output can be obtained from a secondary winding of the transformer, and an output voltage can be controlled by controlling the ON period of the first switching element. The secondary winding of the transformer is connected to a first rectifying and smoothing circuit. A first control circuit is configured to operate using a DC voltage supplied from a second rectifying and smoothing circuit. After the second switching element has been turned on, the second switching element is forcefully turned off at a predetermined time set by a turn-off circuit included in a second control circuit that operates using an AC voltage. | 11-27-2008 |
20080316776 | RESONANT-TYPE SWITCHING POWER SUPPLY DEVICE - There is provided a switching power supply device having one half-wave rectifying circuit made up of switching elements complementarily turned on or off, a reactor, a current resonance capacitor, a transformer, and a rectifying diode and another half-wave rectifying circuit made up of switching elements complementarily turned on or off, a reactor, a current resonance capacitor, a transformer, and a rectifying diode and configured so that the half-wave rectifying circuits commonly charges a smoothing capacitor. The switching elements are turned on or off according to a voltage of the smoothing capacitor and other switching elements are turned on or off based on a difference between a charging voltage of the current resonance capacitor and a charging voltage of the current resonance capacitor. As a result, power energy fed from the half-wave rectifying circuits connected in parallel is made equal. | 12-25-2008 |
20090059623 | Switched-mode Power Supply With EMI Isolation - Embodiments disclosed herein describe a switched-mode power supply with the EMI isolated from a input power, by disconnecting the input power from the switched-mode power supply when the switched-mode power supply is switching. | 03-05-2009 |
20090154200 | CONTROLLER CIRCUIT AND SYSTEM HAVING SUCH A CONTROLLER CIRCUIT - A controller circuit is specified, having a step-up controller, a resonant converter connected downstream of the step-up controller on the output side, a transformer, a rectifier, which rectifier is connected to the secondary winding of the transformer on the input side, and a CLL resonant circuit connected to the resonant converter and to the primary winding of the transformer, which CLL resonant circuit has a resonance capacitance and a first and a second resonance inductance. In order to reduce the switching losses, the CLL resonant circuit is embodied as a “T” circuit. | 06-18-2009 |
20090196074 | Resonant Converter - A resonant converter includes a square wave generator including a first switch and a second switch, and generating a first square wave corresponding to an input voltage by alternately turning on/off the first and second switches; a resonator including a first coil of a primary coil of a transformer, and generating a resonance waveform corresponding to the first square wave; and an output unit including a second coil of a secondary coil of the transformer, and outputting a voltage corresponding to a current generated in the second coil corresponding to the resonance waveform. The square wave generator includes a pulse frequency modulation controller for turning on/off the first and second switches, comparing a first voltage linearly increased while the second switch maintains the turn-on state and a second voltage corresponding to an integration value on the time of the current flowing to the second switch when the second switch is turned off, and changing on/off drive frequencies of the first and second switches according to a comparison result. Therefore, a resonant converter driven with safety is realized. | 08-06-2009 |
20090231887 | PARALLEL-CONNECTED RESONANT CONVERTER CIRCUIT AND CONTROLLING METHOD THEREOF - The configurations of a parallel-connected resonant converter circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a plurality of resonant converters, each of which has two input terminals and two output terminals, wherein all the two input terminals of the plurality of resonant converters are electrically series-connected, and all the two output terminals of the plurality of resonant converters are electrically parallel-connected. | 09-17-2009 |
20090251929 | Convertor and Driving Method Thereof - A converter and a driving method thereof are provided. The converter includes first and second switches, and generates a square wave signal according to operations of the first and second switches. The converter includes a first capacitor and a primary coil, and resonates a driving voltage by using a driving voltage with the first capacitor and the primary coil so as to generate a driving current. The converter includes a secondary coil that forms the primary coil and the transformer, and generates output power by rectifying a current and a voltage generated in the secondary coil. In addition, the converter detects the phase of the driving current, and increases switching frequencies of the first and second switches if a phase difference of the phase of the driving current and that of the driving voltage is smaller than a predetermined value. | 10-08-2009 |
20090284990 | VOLTAGE-CONVERTER CIRCUIT AND METHOD FOR CLOCKED SUPPLY OF ENERGY TO AN ENERGY STORAGE - The present invention provides a voltage converter circuit for the clocked supplying of energy to an energy storage, based on an input voltage present at an input of the voltage converter circuit. The voltage converter circuit comprises an energy storage and a switch assembly, the switch assembly comprising a first switch and a second switch connected in parallel and coupled to the energy storage. The first switch of the switch assembly exhibits, according to magnitude, a smaller turn-on voltage than the second switch, wherein a control terminal of the first switch is switched such that the first switch is active in a starting phase of the voltage converter circuit in order to supply the energy storage with energy, and wherein a control terminal of the second switch is switched such that the second switch is active after the starting phase in order to supply the energy storage with energy in a clocked manner. | 11-19-2009 |
20090284991 | Switching power supply - A switching power supply includes a control circuit controlling ON and OFF of switching devices Q | 11-19-2009 |
20090290389 | SERIES RESONANT CONVERTER - A series resonant converter of the present invention includes an inverter circuit having at least a pair of a first and second switching device connected between two input terminals, a transformer having a primary winding and a secondary winding connected to the inverter circuit, a first and second resonant capacitor connected to a secondary side of the transformer and connected in series to each other between two output terminals, a first and second unidirectional device connected in series to each other, and a resonant induction device that is operated along with the first and second resonant capacitor and resonates in series. The first and second unidirectional device are configured such that current does not flow from the first and second resonant capacitor to the input terminal by preventing electric charge of the first and second resonant capacitor from being discharged to a primary side of the transformer. | 11-26-2009 |
20100008107 | DC/DC CONVERTER - A direct current-direct current (DC/DC) converter operated in the resonant mode of operation for converting a direct input voltage into a direct output voltage with a bridge circuit located on the input side and incorporating switching elements, with a resonance circuit incorporating a resonance inductance and a resonance capacitance as well as with a high-frequency transformer for galvanic separation is disclosed, the transformer incorporates at least one primary winding and at least one secondary winding with at least two winding terminals each. The alternating current (AC) output of the bridge circuit is connected to the primary winding and a rectifier bridge with diodes to the secondary winding. A voltage boosting circuit array is connected downstream of the resonant circuit in such a manner that at least one additionally controllable switching element is contained, which is connected in parallel or in series to at least one additional diode or to at least one diode of the rectifier bridge on the secondary side, this array being connected in parallel to the high-frequency transformer so that the additional switching element short-circuits the resonance circuit in a triggered condition so that energy is stored in the resonance inductance and is delivered in the non-triggered condition. | 01-14-2010 |
20100046251 | MULTIPLE-OUTPUT SWITCHING POWER SOURCE APPARATUS - A multiple-output switching power source apparatus has a series resonant circuit connected in parallel with a switch Q | 02-25-2010 |
20100061123 | TWO TERMINALS QUASI RESONANT TANK CIRCUIT - A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy source for a transformer resonance. The auxiliary switch effectively exchanges energy between the primary inductance of the transformer and the first and second resonant capacitors. The auxiliary switch effectively switches the transformer resonance between two distinct frequencies. In one embodiment of the invention, the power converter can be, but is not limited to, a flyback converter and further includes a comparator and a driver. The comparator is for detecting the voltage across the second resonance capacitor and the driver is configured to drive the auxiliary switch based on the output state of the comparator. The resonant nature of the converter provides zero voltage (ZVS) for the primary switch as well as for the auxiliary switch. | 03-11-2010 |
20100067261 | SWITCHING POWER SUPPLY DEVICE OF HALF-WAVE RECTIFICATION CURRENT RESONANCE TYPE AND METHOD FOR STARTING SAME - Object of this invention is to prevent deviating increase of switching frequency of a switching element for a half-wave rectification current resonance type switching power supply device in the process of a soft start operation. To solve the object, between output terminals of a direct current power source, a first switching element Q | 03-18-2010 |
20100091525 | POWER CONVERTERS - We describe a resonant discontinuous power converter including a magnetic energy storage device, and a bipolar junction transistor (BJT) switch having a collector terminal coupled to repetitively switch power from the input on and off to said magnetic energy storage device such that power is transferred from the input to the output. During an off-period of said BJT switch a voltage on said magnetic energy storage device and on said collector terminal of said BJT is at least partially resonant. The power converter includes a voltage clamping circuit to clamp a base voltage on a base terminal of said BJT during a resonant portion of said off-period to limit an excursion of a collector voltage on said collector terminal of said BJT towards or beyond an emitter voltage of said BJT during said resonant portion of said off-period, in particular to inhibit reverse bias of a base emitter junction of the transistor. | 04-15-2010 |
20100103704 | CONTROL DEVICE FOR RECTIFIERS OF SWITCHING CONVERTERS - A control device for a rectifier of a switching converter, the converter powered by an input voltage and suitable for providing an output current. The rectifier is suitable for rectifying an output current of the converter and includes at least one transistor. The control device is suitable for driving the at least one transistor. The control device has a first circuit suitable for identifying the start and the end of every converter switching half-cycle and measuring the duration thereof, a second circuit suitable for generating a signal for turning on the transistor after a given number of measured converter switching half-cycles and when the output current of the converter becomes greater than a reference current. | 04-29-2010 |
20100124079 | OFFLINE SYNCHRONOUS RECTIFIER WITH CAUSAL CIRCUIT FOR RESONANT SWITCHING POWER CONVERTER - A synchronous rectifier of a resonant switching power converter is provided to improve efficiency. The synchronous rectifier includes a power transistor and a diode connected to a transformer and an output of the resonant switching power converter for ratifications. A controller generates a drive signal to control the power transistor in response to an on signal and an off signal. A causal circuit is developed to generate the off signal in accordance with the on signal. The on signal is enabled once the diode is forward biased. The on signal is coupled to enable the drive signal for switching on the power transistor. The off signal is coupled to disable the drive signal for switching off the power transistor. The off signal is enabled before the on signal is disabled. | 05-20-2010 |
20100142229 | Switching power source device and switching power source control circuit - A switching power source device which has main switch elements which switch a current path of the series resonant circuit, and a transformer which induces a current to a secondary side, controls the main switch elements on a primary side. Synchronous rectification switch elements are turned ON and OFF in response to one of the main switch elements. A synchronous control circuit which turns the synchronous rectification switch element ON in synchronization with an ON timing of the main switch element, or a conduction timing of internal diodes in the synchronous rectification switch elements detected by an inter-terminal voltage signal of the synchronous rectification switch element, whichever timing is later, determines a maximum ON width of the synchronous rectification switch element in accordance with a delay time of the conduction timing of the internal diodes with respect to the ON timing of the main switch element. | 06-10-2010 |
20100165668 | HIGH EFFICIENCY UNIVERSAL INPUT SWITCHING POWER SUPPLY - A universal input switching power supply has the rectifier, a signal detecting unit detecting a voltage of an external AC power and outputting a detecting signal, a PFC circuit converts a first DC power from the rectifier to a second DC power with different voltage according to the detecting signal; and a parallel and serial type DC to DC converter converting the second DC power with different voltage to a constant voltage of the third DC power. The parallel and serial type DC to DC converter has a transformer having a primary and secondary coils and physically changes a turn ratio of the primary and secondary coils of a transformer thereof according to a voltage ratio of the second DC power and the third DC power. Accordingly, the universal input switching power supply has good transforming efficiency at different AC power source conditions. | 07-01-2010 |
20100172156 | OFFLINE SYNCHRONOUS RECTIFIER CIRCUIT WITH TURNED-ON ARBITER AND PHASE-LOCK FOR SWITCHING POWER CONVERTERS - A synchronous rectifier circuit of a switching power converter is provided and includes first and second power transistors and first and second diodes connected to a transformer and an output of the power converter for rectifying. An arbiter circuit generates a lock signal to prevent the second power transistor from being turned on when the first diode the first power transistor is turned on. A controller generates a drive signal to control the first power transistor according to an on signal and an off signal. A phase-lock circuit generates the off signal according to the on signal. The on signal is enabled once the first diode is forward biased. The one signal enables the drive signal for turning on the first power transistor. The off signal disables the drive signal for turning off the first power transistor. The off signal is enabled before the disabling of the on signal. | 07-08-2010 |
20100172157 | SWITCHING POWER SUPPLY DEVICE AND SWITCHING POWER SUPPLY CONTROL CIRCUIT - The invention provides a switching power supply device which can detect a light load state on a pulse-by-pulse basis without worsening power efficiency. In a synchronous control circuit, for each timing of the turning-on of main switching elements, the delay time Tdif of the conduction timing of internal diodes Ds determined according to the magnitude of the load LD is detected by a comparator, a reference time pulse Tsrs having a prescribed time width is generated by a load judgment circuit, and the logical product of the two is generated by an AND circuit. By this means, the load is regarded as being a light load when the delay time Tdif is longer than the reference time pulse Tsrs, and the synchronous rectification MOSFETs Qs are not turned on. | 07-08-2010 |
20100177537 | POWER SUPPLY CIRCUIT AND POWER SUPPLY SYSTEM - To provide a power supply circuit which can be applied worldwide without using a high withstand voltage switching element and can supply a load device with stable power. A charging section is arranged between a turn-off capacitor and a load coil. The charging section has the anode connected to the positive terminal of a feedback coil and the cathode connected to the cathode of a zener diode. Thus, when a voltage of a commercial power supply is high, the charging section operates, the turn-off capacitor is quickly charged, an on-period of a transistor is shortened, and an excessive voltage is prevented from being applied between the drain and the source of the transistor. At the same time, an output characteristic indicating relationship between the voltage of the commercial power supply and a current flowing in the load device is permitted to be flat. | 07-15-2010 |
20100182803 | RESONANT CONVERTER EQUIPPED WITH A PHASE SHIFTING OUTPUT CIRCUIT - A resonant converter equipped with a phase shifting output circuit includes a resonant circuit to receive input power and regulate to become at least one resonant power, a switch unit to switch an ON period for the input power to pass through the resonant circuit and a power transformation circuit to regulate the resonant power and output a transformed power. The resonant converter further has a primary output circuit and at least one secondary output circuit. The primary output circuit regulates the transformed power to become a primary output power. A resonant control unit captures a feedback signal from the primary output circuit and generates a resonant control signal. A phase shifting control unit receives the resonant control signal and regulate to become a phase shifting driving signal. The secondary output circuit is controlled by the phase shifting driving signal and provides a secondary output power. | 07-22-2010 |
20100182804 | SWITCHING CIRCUIT FOR PRIMARY-SIDE REGULATED RESONANT POWER CONVERTERS - The present invention provides a switching circuit to regulate an output voltage and a maximum output current at the primary side of a resonant power converter. The switching circuit includes a pair of switching devices and a controller. The controller is coupled to a transformer to sample a voltage signal thereof and generates switching signals to control the switching devices. The switching frequency of the switching signals is increased in response to the decrease of the output voltage. The increase of the switching frequency of the switching signals decreases the power delivered to the output of the resonant power converter. The output current is therefore regulated. | 07-22-2010 |
20100182805 | SWITCHING POWER SUPPLY - A plurality of power supply circuits Z | 07-22-2010 |
20100188870 | CHARGE MODE CONTROL - An apparatus and a method for converting power from a power input to an DC output voltage or current, which apparatus has a serial resonance converter, where a first feedback circuit is connected from the output terminal to an error amplifier, where the apparatus further has a second feedback circuit with at least one first resistor that is connected to a coil and to ground, which second feed back circuit connects the line between the first resistor and the coil and towards an inverting integrator, the output of which is connected through a second capacitor to a second input at a control circuit. As a result, the oscillating frequency is under influence of a signal that depends on the voltage generated in the resistor connected in serial to the coil or transformer. | 07-29-2010 |
20100202162 | ASYMMETRICAL RESONANT POWER CONVERTERS - A resonant power converter is provided and includes a capacitor, an inductive device, a first transistor, a second transistor, and a control circuit. The capacitor and the inductive device develop a resonant tank. The first transistor and the second transistor are coupled to switch the resonant tank. The control circuit generates a first signal and a second signal to control the first transistor and the second transistor respectively. Frequencies of the first signal and the second signal are changed for regulating output of the resonant power converter. The control circuit is further coupled to detect an input voltage of the resonant power converter. A pulse width of the second signal is modulated in response to change of the input voltage. | 08-12-2010 |
20100232183 | CONTROL CIRCUIT OF RESONANT POWER CONVERTER WITH ASYMMETRICAL PHASE SHIFT TO IMPROVE THE OPERATION - A control circuit of the resonant power converter according to the present invention comprises a frequency modulation circuit modulating a switching frequency of a switching signal in response to a feedback signal in a first operation range. A phase-shift circuit performs a phase-shift modulation to the switching signal in response to the feedback signal in a second operation range. A burst circuit performs a burst modulation to the switching signal in response to the feedback signal in a third operation range. The control circuit is operated in the first operation range when the feedback signal is higher than a first threshold. The control circuit is operated in the second operation range when the feedback signal is lower than the first threshold and higher than a second threshold. The control circuit is operated in the third operation range when the feedback signal is lower than the second threshold. | 09-16-2010 |
20100259954 | METHOD AND CIRCUIT FOR AVOIDING HARD SWITCHING IN RESONANT CONVERTERS - A resonant dc-dc converter converts dc input voltage to a dc output voltage. The converter includes switching, switching driving, conversion, and disabling circuits. The switching circuit receives the input voltage and generates a square wave voltage oscillating between the input voltage and a low value, at a frequency with a duty cycle. The switching driving circuit drives the switching circuit and includes a timing circuit for setting the frequency and the duty cycle. The timing circuit sets the value of the duty cycle to about 50% when the converter operates in steady state. The conversion circuit generates the output voltage from the square wave voltage based on the frequency and the duty cycle. The disabling circuit temporarily halts the timing circuit after a power on in such a way to temporarily vary the duty cycle of the square wave voltage during a period of the square wave voltage. | 10-14-2010 |
20100277955 | Boost Device For Voltage Boosting - A boost device boosts an input voltage to an output voltage across an output capacitor, and includes an output diode coupled to the output capacitor, and a transformer coupled to a first switch, a clamp circuit and a boost circuit. The clamp circuit is coupled across a first winding of the transformer, and includes a clamp capacitor coupled in series to a second switch. The output capacitor is capable of being charged through the output diode with an induced voltage across a second winding of the transformer. The boost circuit is capable of being charged with the induced voltage across the second winding, and of charging the output capacitor so as to boost the output voltage across the output capacitor. | 11-04-2010 |
20100290256 | RESONANCE CONVERTING APPARATUS AND SYNCHRONOUS RECTIFICATION CIRCUIT - Provided is a resonance converting apparatus. The resonance converting apparatus preferably includes a resonant circuit, a bridge-type converter, and a synchronous rectification circuit. In which the resonant circuit has a transformer. The bridge-type converter connects with a primary side of the transformer, and operates open or close according to a switching signal. The synchronous rectification circuit further includes a pair of rectification transistors and driving circuits. The driving circuits correspondingly connect with channels to the rectification transistors, and respectively examine the current passing through the rectification transistors. A sensing signal is then generated. In accordance with the switching signal and the sensing signal, a driving signal is generated for driving the rectification transistor. Consequently the apparatus can raise the efficiency of the resonance converting apparatus. | 11-18-2010 |
20100321959 | CONVERTER - A converter includes a control unit configured to turn ON, when an output voltage is set to a low voltage, a switching element according to a pulse voltage induced in a first auxiliary winding of a transformer. The control unit operates based on a direct current voltage output by rectifying and smoothing a pulse voltage induced in a second auxiliary winding of the transformer. | 12-23-2010 |
20100328967 | RESONANT POWER CONVERTER - A resonant power converter including synchronous rectifiers adapted to operate with an overlapping conduction phase and a fixed frequency. | 12-30-2010 |
20100328968 | MULTI-PHASE RESONANT CONVERTER AND METHOD OF CONTROLLING IT - A PWM controlled multi-phase resonant voltage converter may include a plurality of primary windings powered through respective half-bridges, and as many secondary windings connected to an output terminal of the converter and magnetically coupled to the respective primary windings. The primary or secondary windings may be connected such that a real or virtual neutral point is floating. | 12-30-2010 |
20110002145 | METHOD OF OPERATING A RESONANT POWER CONVERTER AND A CONTROLLER THEREFOR - A method of operating a resonant power converter( | 01-06-2011 |
20110007526 | FREQUENCY LIMITATION METHOD WITH TIME HYSTERESIS USED IN QUASI-RESONANT CONTROL - A frequency limitation method used in quasi-resonant control of a switching regulator is disclosed. The switching frequency is limited through setting a minimum time limit, such as a minimum switching period or a minimum OFF time. The minimum time limit may be a first time limit or a second time limit. The minimum time limit is changed into another value if the minimum voltage point approaches the minimum time limit point, so as to eliminate the audible noise. | 01-13-2011 |
20110007527 | MULTI-PHASE SWITCHING POWER CONVERSION CIRCUIT - A multi-phase switching power conversion circuit has at least three phases and includes a plurality of switching circuits, a plurality of transformers, a plurality of output rectifier circuits, a resonant network and a control circuit. The resonant network includes a plurality of symmetrical terminals and a plurality of phase branches, which are connected in a multi-phase symmetrical relationship. Each of the symmetrical terminals is connected to the output side of respective switching circuits. The phase branches are connected to a resonant common terminal such that the phase branches are in a star connection. The resonant common terminal is different from the positive terminal and the first reference terminal of the input voltage source. The control circuit is connected to an output terminal of the multi-phase switching power conversion circuit and a plurality of the control terminals of the plurality of switching circuits. The switching circuits are conducted or shut off according to the output voltage under control of the control circuit, so that the electrical energy of the input voltage source is selectively transmitted to the resonant network. | 01-13-2011 |
20110026275 | VOLTAGE-REGULATING CIRCUIT WITH INPUT VOLTAGE DETECTING CIRCUIT AND PARALLEL VOLTAGE-REGULATING CIRCUIT SYSTEM USING THE SAME - A voltage-regulating circuit according to the present invention includes a power conversion circuit, an input voltage detecting circuit and a feedback circuit. The power conversion circuit includes at least one switch element, wherein during operation of the at least one switch element, an input voltage is converted into a transition voltage. The input voltage detecting circuit is connected to the power conversion circuit for outputting a detected voltage signal corresponding to the input voltage. The feedback circuit is connected to the power conversion circuit and the input voltage detecting circuit for generating a feedback control signal. In such way, as the input voltage is changed, the feedback circuit will adjust to make the transition voltage changed as with the change of the detected voltage signal corresponding to the input voltage. | 02-03-2011 |
20110044074 | CONTROL ARRANGEMENT FOR A RESONANT MODE POWER CONVERTER - A resonant mode power converter is controlled with a control unit including a feedback circuit coupled to generate a first current representative of an output of the power converter. A current limiting circuit is coupled to receive the first current and a second current generated in response to a reference voltage. The current limiting circuit is coupled to limit the first current in response to the second current. An oscillator is coupled to receive the first current to generate a control signal having a control frequency in response to the first current. An output voltage of the power converter is controlled in response to the control frequency of the control signal. | 02-24-2011 |
20110051464 | Compensation Device For Synchronous Rectifier Control And Method Thereof - The configurations of a compensation device configured in a circuit having a synchronous rectifier (SR), a controller and a load, and a compensation method thereof are provided in the present invention. In the proposed circuit, the SR includes a first terminal, a first inductor electrically connected to the first terminal in series, a second terminal and a second inductor electrically connected to the second terminal in series, the controller is coupled to the first and the second inductors, and the device includes a voltage source having a positive terminal coupled to the controller and a negative terminal coupled to the second inductor and providing a compensation voltage to reduce or eliminate the influence of the first and the second inductors towards a voltage value across the first and the second terminals. | 03-03-2011 |
20110051465 | RESONANT SWITCHING POWER SUPPLY DEVICE - Provided is a technique of making the leakage inductance of a transformer serve as a current resonant reactor and connecting a stray capacitance Cf | 03-03-2011 |
20110051466 | POWER UNIT AND IMAGE FORMING APPARATUS - A power unit includes: a frequency divider to divide a clock signal in a second frequency-division ratio based on a first frequency-division ratio and to output a driving pulse; a switching device driven by the driving pulse; a piezoelectric transformer to output an alternating-current high voltage when receiving an intermittent voltage from the switching device; a comparison device to compare a digital signal corresponding to the piezoelectric transformer output voltage with a target voltage and to output a comparison result; a controller to control the first frequency-division ratio based on the comparison result; a first holding device to hold the controlled first frequency-division ratio; a first computing device to determine the second frequency-division ratio by performing computation using a first correction value and the first frequency-division ratio held by the first holding device; and a second holding device to hold the second frequency-division ratio determined by the first computing device. | 03-03-2011 |
20110051467 | RESONANT SWITCHING POWER SUPPLY DEVICE - Provided is a resonant switching power supply device that can reduce a common mode noise as well as an increase in frequency when a load is light. | 03-03-2011 |
20110051468 | SWITCHING POWER-SUPPLY APPARATUS - A switching power-supply apparatus includes a first converter | 03-03-2011 |
20110069514 | DC CONVERSION APPARATUS - A DC conversion apparatus includes a plurality of current resonant converters. Each of the current resonant converters has two switching elements connected in series, a transformer having primary and secondary windings, a series resonant circuit including a resonant reactor, the primary winding of the transformer, and a resonant capacitor, and a rectifying circuit to rectify a voltage generated by the secondary winding of the transformer. The DC conversion apparatus also includes a smoothing circuit having a reactor L | 03-24-2011 |
20110080757 | POWER CONVERTER - The present invention relates to a power converter ( | 04-07-2011 |
20110085354 | BURST MODE RESONANT POWER CONVERTER WITH HIGH CONVERSION EFFICIENCY - A burst mode resonant power converter with high conversion efficiency has a rectifier, a power factor correction circuit, a resonant circuit, a controller, and a burst mode triggering unit. The maximum frequency switching end of the controller is connected to a maximum frequency variable circuit. When the load is medium or heavy, the maximum frequency variable circuit increases the maximum switch frequency of the controller. When the load is in the no-load or the light conditions, it reduces the maximum switch frequency thereof. Therefore, the controller reduces the number of times that the resonant circuit switches the bridge switch circuit. The conduction cycle of the 50% pulse signal output to the bridge switch circuit becomes longer. Larger energy can be transmitted at a time to the secondary coil of the transformer. This increases the overall efficiency. | 04-14-2011 |
20110090717 | Two-stage insulated bidirectional DC/DC power converter using a constant duty ratio LLC resonant converter - A two-stage insulated bidirectional DC/DC power converter is disclosed. A two-stage insulated bidirectional DC/DC power converter according to an embodiment of the invention has the characteristic of including: an LLC resonant converter operating at a constant duty ratio; a bidirectional converter joined to a front part of the LLC resonant converter and configured to perform a booster converter function of outputting the input voltage at a consistent input voltage for the LLC resonant converter, and a buck converter function of reducing the voltage by way of the LLC resonant converter and then outputting a consistent voltage; and a bidirectional converter control unit configured to control changes in an input voltage of the bidirectional converter and regulate an output voltage of the LLC resonant converter to thereby maintain a consistent input voltage of the LLC resonant converter, such that the LLC resonant converter operates at a constant duty ratio. | 04-21-2011 |
20110103100 | ISOLATED SWITCHING POWER SUPPLY APPARATUS - In an isolated switching power supply apparatus, by performing on/off control of a first switching device and a second switching device, energy is transmitted from the primary side to the secondary side using a second primary winding and a second secondary winding while the first switching device is on, and energy is transmitted by a first primary winding and a first secondary winding while the second switching device is on. The first secondary winding and the second secondary winding are connected in series with one another, and an inductor is inserted in series to the second secondary winding. An output current is made to flow through the inductor irrespective of whether the first switching device is on or the second switching device is on. | 05-05-2011 |
20110134662 | BLOCKING OSCILLATOR TYPE CONVERTER - A blocking-oscillator-type converter circuit works with a transformer that has only one primary winding and one secondary winding. The transformer contains no reaction coupling winding for the blocking oscillator. | 06-09-2011 |
20110149607 | Controller for a Power Converter - A power converter employing a controller configured to increase a dead time between conduction periods of first and second power switches therein and method of operating the same. In one embodiment, the power converter includes first and second power switches coupled to an input thereof, and a sensor configured to provide a sensed signal representative of at least one of a current level and a power level of the power converter. The power converter also includes a controller configured to increase a dead time between conduction periods of the first and second power switches when the sensed signal indicates a decrease of at least one of the current level and the power level of the power converter. | 06-23-2011 |
20110149608 | ELECTRICAL POWER CONVERTERS AND METHODS OF OPERATION - An electrical power converter includes a transformer ( | 06-23-2011 |
20110176334 | CARRIER WAVE AMPLITUDE CONTROL IN POWER SOURCE FOR STABILIZING DC VOLTAGE BY UTILIZING FREQUENCY DEPENDENCE OF RESONANCE - In the power supply composed of a driver circuit generating the carrier, a resonance circuit driven by the carrier and a rectification circuit generating the dc. voltage by rectifying the amplitude-modulated carrier supplied by the resonance circuit and stabilizing the output voltage by the feeding back the voltage error between the output voltage and a reference voltage externally supplied to set up the output voltage, to the frequency and the amplitude of the carrier, the frequency response of the dc. power supply is improved both by providing the pole located at the origin with a transfer function where the dc. voltage, generated by rectifying and smoothing the output of the resonance circuit, is fed back to the frequency of the carrier and by not providing the pole at the origin with a transfer function where the dc. voltage is fed back to the amplitude of the carrier. | 07-21-2011 |
20110176335 | RESONANT CONVERTERS AND BURST MODE CONTROL METHOD THEREOF - A burst mode control method for a resonant converter is provided, in which at least one first regulation pulse is provided to pre-adjust a magnetizing inductor current and a resonant capacitor voltage in a resonant circuit during a burst mode working period. After the first regulation pulse is completed, at least one pulse group including a plurality of driving pulses is provided to intermittently turn on switching elements of a square wave generator. The first regulation pulse adjusts the magnetizing inductor current and the resonant capacitor voltage, such that the magnitude of the magnetizing inductor current is essentially the same and the magnitude of the resonant capacitor voltage is essentially the same at each rising edge of each driving pulse of the pulse group. | 07-21-2011 |
20110205761 | Controller for a Resonant Power Converter - This invention relates to circuits and methods for controlling a resonant power converter. Control of the power converter may comprise comparing an output voltage or current of the converter to at least one reference voltage or current; enabling primary side switching signals based on a first selected result of the comparison; and disabling primary side switching signals based on a second selected result of the comparison; wherein a primary side switching signal for each primary side switch includes at least one off-on-off transition. | 08-25-2011 |
20110211370 | Systems and Methods of Resonant DC/DC Conversion - Systems and methods of resonant DC/DC conversion disclosed herein improve the basic resonant converter designs by proactively setting and coordinating the gate drive timings between the primary side and secondary side. By proactively setting and coordinating gate drives timings between the primary side and secondary side, both efficiency and transient performance optimizations may be achieved with or without diode emulation mode, depending on whether the switching frequency is below resonance or above resonance, and the nature of the load characteristics. If the switching frequency of the converter is determined to be at or below the resonance frequency, the output transistors may be configured to be fully active at or above a predetermined output load current. The turn-on timing of the output transistors is dependant on the load for a given output voltage, and is almost independent of input voltage. Turn-on timing may be significantly different at light load to no load. | 09-01-2011 |
20110222317 | CONVERTER CIRCUIT AND UNIT AND SYSTEM COMPRISING SUCH CONVERTER CIRCUIT - A converter circuit has a first resonant converter that is connected on the DC voltage side to a first energy storage circuit, and a transformer. A second resonant converter is connected on the AC voltage side to the secondary winding of the transformer and on the DC voltage side to a load converter, and a CLL resonant circuit is connected to the first resonant converter and to the primary winding of the transformer. The CLL resonant circuit has a resonant capacitance, a first resonant inductance and a second resonant inductance. | 09-15-2011 |
20110228566 | Series resonant converter with overload delay and short-circuit protection mechanisms - The present invention is to provide a series resonant converter with an overload delay and short-circuit protection mechanism, which includes a voltage sensing circuit for sensing a voltage ripple level on a primary side of a transformer thereof, that corresponds to a load on a secondary side of the transformer, and generating and sending a DC detection level to an overload delay circuit and a short-circuit protection circuit thereof accordingly. The overload delay circuit and the short-circuit protection circuit are able control the converter through a resonant controller chip to output different currents according to magnitude of the load on the secondary side and maintain stable operation for a predetermined delay time even if the secondary side is overloaded, however, once the secondary side is short-circuited, the converter is turned off instantly. Thus, the converter is effectively prevented from damage which may otherwise result from sustained overload or short circuit. | 09-22-2011 |
20110249473 | RESONANT CONVERTING DEVICE, AND CONTROL MODULE AND METHOD FOR CONTROLLING A RESONANT CONVERTER - A method for controlling operation of a resonant converter is to be implemented by a control module that generates a drive signal for controlling a power switch of the resonant converter to thereby control an output voltage and an output current provided by the resonant converter to a load. The method includes: (A) configuring the control module to determine if the load is operating in a first mode or a second mode; (B) configuring the control module to generate the drive signal according to the output voltage when the control module determines that the load is operating in the first mode; and (C) configuring the control module to generate the drive signal according to the output current when the control module determines that the load is operating in the second mode. | 10-13-2011 |
20110261592 | CURRENT RESONANCE POWER SUPPLY - A current resonance power supply includes a current detecting unit detecting a current flowing through a primary side of a transformer and a current compensating unit compensating the current detected by the current detecting unit in accordance with a variation in voltage input into the primary side of the transformer. The current resonance power supply detects overcurrent on the basis of an output from the current compensating unit. | 10-27-2011 |
20110261593 | Power Converter for a Power Generator - Provided are methods, circuits, and systems for obtaining power from a power generator such as a photovoltaic cell or a fuel cell. The methods, circuits, and systems comprise converting substantially DC output power from the power generator into a high frequency AC voltage while rejecting or minimizing oscillations in the output power from the power generator; converting the high frequency AC voltage into a high frequency substantially sinusoidal voltage or current; and converting the high frequency substantially sinusoidal AC voltage or current into (i) a DC voltage or current, and (ii) a low frequency substantially sinusoidal AC voltage or current; wherein the high frequency substantially sinusoidal AC voltage or current is isolated from the DC voltage or current or the low frequency substantially sinusoidal AC voltage or current. | 10-27-2011 |
20110267844 | Controller for a Resonant Switched-Mode Power Converter - An embodiment of the invention relates to an LLC power converter including a controller configured to regulate an output characteristic of the power converter by controlling a power converter switching frequency. In a first mode of operation, the controller turns off a secondary-side power switch earlier than a turn-off time of a primary-side power switch by a time difference that is controlled by a resistor coupled to an external circuit node. In a second mode of operation, the controller turns on a secondary-side power switch at substantially the same time as the primary-side power switch, and turns off the secondary-side power switch after a maximum on time that is a nonlinear function of a load current of the power converter. The nonlinear function is a substantially constant function of the load current for a value of the load current higher than a threshold value. | 11-03-2011 |
20110267845 | PARALLEL-CONNECTED RESONANT CONVERTER CIRCUIT AND CONTROLLING METHOD THEREOF - The configurations of a parallel-connected resonant converter circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a plurality of resonant converters, each of which has two input terminals and two output terminals, wherein all the two input terminals of the plurality of resonant converters are electrically series-connected, and all the two output terminals of the plurality of resonant converters are electrically parallel-connected. | 11-03-2011 |
20110273911 | DC/DC CONVERTER - The present invention relates to a DC/DC converter ( | 11-10-2011 |
20110280047 | Switching power adaptor circuit - An improved structure for a switching power adaptor circuit, primarily providing a switching power adaptor circuit for a RCC (Ringing Choke Converter) system, in which a control circuit is mainly structured from a bipolar junction transistor, a stable voltage sensing circuit, an over current protection circuit and an over voltage protection circuit, thereby providing the present invention with multiple protection effectiveness, which is able to ensure that the voltage at secondary winding output terminals is maintained at a stable value, thus improving safety in the use of electrical appliance products, and achieving effectiveness to reduce size and lower manufacturing costs. | 11-17-2011 |
20110292688 | RESONANT CONVERSION SYSTEM WITH OVER-CURRENT PROTECTION PROCESSES - A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process. | 12-01-2011 |
20110292689 | DRIVING CIRCUIT FOR POWER SWITCHING DEVICE, DRIVING METHOD THEREOF, AND SWITCHING POWER SUPPLY APPARATUS - A driving circuit includes a generator configured to generate a driving signal having plural levels of voltage at which a power switching device is turned on. The driving circuit also includes a switching controller configured to switch between the plural levels of voltage at which the power switching device is turned on. The driving circuit further includes a load current detector configured to output a load current detection signal to the switching controller, the load current detection signal indicating whether or not a current flowing through the power switching device exceeds a threshold, wherein the switching controller is configured to perform the switching based on the load current detection. | 12-01-2011 |
20110299303 | Inverter of new and renewable energy storage system - Provided is an inverter of a renewable energy storage system, which has an input port and an output port electrically insulated, and is compact and low-priced, while having a simplified circuit. The inverter includes a DC-DC converting unit connected to the DC link, and an inverting unit connected between the DC-DC converting unit and the power system, wherein the DC-DC converting unit is an unregulated DC-DC bus converter. | 12-08-2011 |
20110305044 | SWEEPING FREQUENCY LLC RESONANT POWER REGULATOR - An LLC resonant power regulator system ( | 12-15-2011 |
20110305045 | RESONANT POWER CONVERTING CIRCUIT - A resonant power converting circuit is provided, which includes a resonant converting unit, a control unit, a current detecting unit and a frequency modulation unit. The control unit outputs switching signals to the resonant converting unit to adjust an output thereof. The current detecting unit is configured to detect an output current of the resonant converting unit. The frequency modulation unit may adjust a lowest switching frequency of the control unit according to the detected output current so as to increase a gain of the resonant converting unit and an output stability of the resonant converting unit. | 12-15-2011 |
20110305046 | RESONANT POWER CONVERTING CIRCUIT - A resonant power converting circuit is provided, which includes a resonant converting unit, a control unit, a voltage detecting unit and a frequency modulation unit. The control unit outputs switching signals to the resonant converting unit to adjust an output of the resonant converting unit. The voltage detecting unit is configured to detect an output voltage of the resonant converting unit. The frequency modulation unit may adjust a lowest switching frequency of the control unit according to the detected output voltage so as to increase a gain of the resonant converting unit and an output stability of the resonant converting unit. | 12-15-2011 |
20110305047 | Control System for a Power Converter and Method of Operating the Same - A power converter employing a control system configured to make multiple functional use of a circuit node therein and method of operating the same. In one embodiment, the power converter includes a power train including at least one power switch. The power converter also includes a control system including an opto-isolator circuit, including a resistor, configured to receive an output signal from the power converter and provide a feedback signal to a feedback node for the control system to provide a switch control signal for the at least one power switch. The control system also includes a current source configured to produce multiple voltage levels at the feedback node in accordance with the resistor, thereby enabling multiple functional uses of the feedback node. | 12-15-2011 |
20110310638 | POWER FACTOR CORRECTOR AND DRIVING METHOD THEREOF - The present invention relates to a power factor corrector and a driving method thereof. | 12-22-2011 |
20110317452 | BI-DIRECTIONAL POWER CONVERTER WITH REGULATED OUTPUT AND SOFT SWITCHING - A resonant, bi-directional, DC to DC voltage converter with loss-less (soft) switching having regulated output and capable of converting power between two, high-potential and low-potential DC voltage sources. The converter's semiconductor and magnetic components provide both, output regulation and soft switching in both (step-down and step-up) directions of power conversion which reduces total component count, cost and volume and enhances power conversion efficiency. | 12-29-2011 |
20120020119 | AC-DC CONVERTER AND CONTROL CIRCUIT THEREOF - The invention discloses a control circuit for an AC-DC converter. The control circuit includes a power control circuit for comparing an input current sensing signal generated by sensing an input current of the AC-DC converter and a power level control input and in response thereto generating a frequency modulation control signal, in which the frequency modulation control signal is used to control the output power of the AC-DC converter and suppress harmonics of the input current, and a square wave generator connected to the power control circuit for generating a driving signal used to drive the switch circuit of the AC-DC converter according to the frequency modulation control signal, in which the frequency of the driving signal is varied with the frequency modulation control signal, thereby suppressing harmonics of the input current and regulating the switching frequency the AC-DC converter, and regulating the output power of the AC-DC converter. | 01-26-2012 |
20120033451 | CONVERTER - A converter includes a rectifying circuit of an AC voltage of an AC power source into a rectified voltage, an input smoothing capacitor Ci, a first series circuit connected to the input smoothing capacitor and including a first and a second switching elements, a second series circuit connected to a connection point of the first and second switching elements and a first end of the input smoothing capacitor and including a primary winding of a transformer and a first capacitor Cri, a controller to alternately turn on/off the first and second switching elements, a rectifying-smoothing circuit (D | 02-09-2012 |
20120033452 | DC/DC CONVERTER - The present invention relates to a DC/DC converter ( | 02-09-2012 |
20120033453 | Controller for a Resonant Switched-Mode Power Converter - In accordance with an embodiment, a switch controller for a switched-mode power supply includes an oscillator, an advance timing generator, and a dead zone generator. The advance timing generator generates an advance timing output pulse having a first pulse width that is asserted when the oscillator reaches a first phase. The dead zone generator produces a dead zone output having a second pulse width when the advance timing output pulse is de-asserted. This dead zone output pulse is coupled to a freeze input of the oscillator that freezes the phase accumulation of the oscillator when asserted. The controller also has a primary switch logic circuit that produces primary switch drive signals having a dead zone coincident with the dead zone output, and a secondary switch logic circuit that generates a secondary switch drive signal that is de-asserted when the advance timing output pulse becomes asserted. | 02-09-2012 |
20120044721 | Series resonant converter using power switches with relatively low rated voltages and currents - The present invention is to provide a series resonant converter, which includes a transformer, two power switches connected to primary side of the transformer, a resonant control chip having two control pins connected to gates of the two power switches respectively, a resonant capacitor having one end connected to one end of the primary side and the other end connected to source of one power switch, a resonant inductor having one end connected to the other end of the primary side and the other end connected to a line between the two power switches, and at least one bypass resistor connected in parallel to the resonant capacitor, so as to allow voltage of the resonant capacitor to be rapidly released to ground when the converter is turned off and effectively lower inrush current of the resonant capacitor generated at an instant when the converter is turned on from off. | 02-23-2012 |
20120057374 | DUTY ADJUSTER CIRCUIT AND CONVERTER INCLUDING THE SAME - The present invention relates to a duty adjuster circuit and a converter. | 03-08-2012 |
20120063173 | Common Mode Noise Reduction Apparatus and Method - An embodiment common mode noise reduction apparatus comprises a common mode choke, a balance inductor, a first capacitor and a second capacitor. The common mode choke is placed between an input dc source and a primary side network of an isolated power converter. The balance inductor is coupled between an upper terminal of a primary winding of the isolated power converter and a negative terminal of the input dc source. The first capacitor is coupled between the upper terminal of a primary side of a transformer and an upper terminal of a secondary side of the transformer of the isolated power converter. The second capacitor is coupled between a lower terminal of the primary side of the transformer and a lower terminal of the secondary side of the transformer of the isolated power converter. | 03-15-2012 |
20120063174 | POWER FACTOR CORRECT CURRENT RESONANCE CONVERTER - A power factor correct current resonance converter is disclosed which eliminates interference of switching operations between two cascade-connected converter circuits. The power factor correct current resonance converter includes a current resonance converter circuit having switches, a resonance capacitor, a resonance inductor, a transformer, diodes, a smoothing capacitor, and a control circuit. The power factor correct current resonance converter also includes a power factor correct converter circuit having a choke coil, a diode, a smoothing capacitor, and a switch. The switch is turned on or off in response to a voltage produced in a winding of the transformer. Thus, the switching operation of the power factor correct converter circuit is performed in synchronization with the switching operation of the current resonance converter circuit, so that interference of the switching operations is eliminated. In addition, since a dedicated control circuit is not required, the cost can be reduced. | 03-15-2012 |
20120069605 | SAMPLED CHARGE CONTROL FOR RESONANT CONVERTER - This document discusses, among other things, apparatus and methods for controlling a converter. In an example, a voltage-controlled oscillator (VCO) can be configured to provide a first pulse train to control the converter. The frequency of the first pulse train of the VCO can be modulated using information indicative of an operating condition of the converter to maintain a desired DC voltage at an output. In an example, the VCO can include a frequency divider configured to provide a second pulse train to the output using information from the first pulse train. | 03-22-2012 |
20120069606 | VERY HIGH FREQUENCY SWITCHING CELL-BASED POWER CONVERTER - In an aspect, the present invention provides a high frequency switching power converter. The high frequency switching power converter may include a plurality of soft-switchable power cells flexibly connected to receive an input signal in series and provide an output. The high frequency switching power converter may further include a controller for configuring the flexible connection and for controlling the power cells to receive the input signal. In an embodiment, each of the plurality of power cells may be separately controllable by the controller. Further, a portion of the plurality of power cells may be arranged with parallel outputs. Additionally, at least one of the plurality of cells may include one or more switched capacitors. In another embodiment, the at least one of the plurality of cells may include at least one switched capacitor and a DC/DC regulating converter. | 03-22-2012 |
20120075888 | DUTY BALANCING OSCILATOR - The present invention relates to an oscillator that is capable of realizing duty balancing. | 03-29-2012 |
20120087155 | AC-DC CONVERTER - An AC-DC converter is disclosed. The AC-DC converter includes an OFF-time clamping circuit. The OFF time clamping circuit outputs a triggering signal when a main switch circuit of the AC-DC converter is switched from ON state to OFF state. When an input AC voltage is too small, and a terminal voltage at a first current-conducting terminal of the main switch circuit of the AC-DC converter is lower than a specific voltage such that a switching control circuit can not turn on the main switch circuit again, the switching control circuit can still turn on the main switch circuit again by the triggering signal. Therefore, the OFF time of the main switch circuit is clamped. The switching control circuit can control the switching operation of the main switch circuit. | 04-12-2012 |
20120106206 | POWER SUPPLY WITH SINGLE STAGE CONVERTER FOR PERFORMING POWER FACTOR CORRECTION AND RESONANT CONVERSION - The invention discloses a power supply having a single stage converter for performing power factor correction to reduce high-frequency harmonics in the input current and performing resonant conversion to achieve zero-voltage switching or zero-current switching for power conversion. The inventive single stage converter includes a switching circuit, a resonant circuit, a power control circuit, and a square wave generator. The switching circuit includes at least one switch and the resonant circuit includes a LLC resonant tank. The power control circuit includes a proportional differential circuit such as a power amplifier configured in a negative feedback topology, and the square wave generator is configured to generate driving signals based on the frequency modulation control signal generated by the comparison of the sensed input current and a user-defined power level input, thereby allowing the square wave generator to regulate the switching operation of the switching circuit. | 05-03-2012 |
20120106207 | RESONANT TRANSFORMER AND RESONANT CONVERTER EMPLOYING SAME - A resonant transformer and resonant converter are disclosed. The resonant transformer includes a first bobbin, a first primary winding coil, plural first secondary winding coils, a second bobbin, a second primary winding coil, plural second secondary winding coils and a magnetic core assembly. The first bobbin includes a first winding section and plural single-trough second winding sections. Plural pins are arranged at the first winding section. The first primary winding coil is wound around the first winding section and connected with the pins. The first secondary winding coils are wound around respective single-trough second winding sections. The second bobbin includes a third winding section and plural single-trough fourth winding sections. The second primary winding coil are wound around the third winding section and connected with the pins at the first winding section of the first bobbin. The second secondary winding coils are wound around respective single-trough fourth winding sections. | 05-03-2012 |
20120113686 | VIRTUAL PARAMETRIC HIGH SIDE MOSFET DRIVER - A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The converter circuit comprises a primary and an auxiliary switch for selectively determining a resonant frequency. The auxiliary switch is enabled by a driver having an independent power source so as to allow as strong a driver as necessary to drive a large auxiliary switch. | 05-10-2012 |
20120113687 | LOOSELY REGULATED FEEDBACK CONTROL FOR HIGH EFFICIENCY ISOLATED DC-DC CONVERTERS - The improved DC-DC converter apparatus includes a primary side circuit and a secondary side circuit that is galvanically isolated from the primary. The primary side induces a voltage in the secondary side that provides an output voltage for driving POLs. A flux-control device measures the transformer primary side flux to control the primary side duty cycle, thereby loosely regulating the output voltage of the secondary side circuit, | 05-10-2012 |
20120127761 | CIRCUIT FOR A RESONANT CONVERTER - A circuit ( | 05-24-2012 |
20120163037 | RESONANT CONVERTER - Disclosed herein is a resonant converter, including: a power conversion circuit alternately switching applied DC power to output a predetermined level of output power; and a control circuit fixing an operating frequency and controlling the level of the output power by varying the comparison voltage level that is a comparison target of the operating frequency, by determining that a short circuit occurs when the output current of the power conversion circuit is a reference current or more by comparing the output current of the power conversion circuit with the reference current. By this configuration, the output current can be constantly controlled even when the short circuit occurs in the output of the resonant converter. | 06-28-2012 |
20120163038 | CONTROL CIRCUIT OF LLC RESONANT CONVERTER AND LLC RESONANT CONVERTER USING THE SAME - The present invention provides a control circuit of an LLC resonant converter including a minimum switching frequency variable circuit of varying a minimum switching frequency corresponding to an AC input voltage of the LLC resonant converter; and a first pulse signal generating unit and a second pulse signal generating unit to generate a first pulse signal and a second pulse signal based on a switching frequency limited by the minimum switching frequency variable circuit. | 06-28-2012 |
20120163039 | CONTROLLER FOR A RESONANT CONVERTER - A controller for a resonant converter, wherein the controller is configured to operate the resonant converter in a high power mode of operation by adjusting a first control parameter to vary the output power and a low power mode of operation by adjusting a second control parameter to vary the output power. The controller is configured to set the value of the first control parameter when changing between the high power mode of operation and the low power mode of operation such that the output power is substantially consistent during the changeover. | 06-28-2012 |
20120176817 | DC-DC CONVERTER - A DC-DC converter has at least first and second power converters, with the inputs of the power converters connected in series so that DC current through the input of the first power converter also flows through the input of the second power converter, and the outputs of the power converters are connected in parallel. | 07-12-2012 |
20120188797 | SWITCHING POWER SOURCE APPARATUS - A switching power source apparatus includes a first series circuit including a first switch element and a second switch element, a second series circuit including a resonant capacitor, a resonant reactor, and a primary winding of a transformer, a rectifying-smoothing circuit of a voltage of a secondary winding of the transformer, a controller of the first and second switch elements, a current detector detecting a current of the resonant capacitor Cri when the first switch element is ON, an integration circuit of the current of the current detector integrating the voltage signal over a period in which the voltage signal is equal to or greater than a first reference voltage, and an overcurrent protector of the first switch element if an output voltage of the integration circuit is equal to or greater than a second reference voltage. | 07-26-2012 |
20120201055 | POWER SUPPLY AND APPARATUS AND METHOD FOR CONTROLLING LINK VOLTAGE CONTROL SWITCH - A power supply includes a rectifier for rectifying an AC line voltage to generate a link voltage, a link capacitor for charging the link voltage, a control switch for controlling charge of the link capacitor, a converter for converting the link voltage to a DC voltage, and a switch controller. When the converter operates in a standby operation mode, the switch controller controls on-off of the control switch through a pulse signal having an on-time determined based on a peak value of a detected AC line voltage. | 08-09-2012 |
20120206943 | VERY HIGH FREQUENCY SWITCHING RESONANT SYNCHRONOUS RECTIFICATION - A VHF switching power converter comprising one or more VHF switching frequency resonant synchronous rectifiers receives an output from an inverter and delivers a DC output to a load. The power converter includes a controller for controlling at least one of the one or more VHF switching frequency resonant synchronous rectifiers based on feedback derived from a waveform of at least one of the rectifiers. The controller controls a phase angle of at least one of the rectifiers with a delay locked loop. The power converter delivers a regulated DC output via adjustment of a phase shift between at least one of the one or more rectifiers and the inverter. | 08-16-2012 |
20120243266 | METHOD AND APPARATUS FOR HIGH-SIDE INPUT WINDING REGULATION - A controller for use in a power converter includes a control circuit coupled to control switching of a power switch coupled between a positive input supply rail of the power converter and an energy transfer element input of the power converter. A sampling circuit is coupled to the control circuit and is coupled to receive a signal across the energy transfer element input during an off time of the power switch to provide a sampled output of the converter. The sampled output of the power converter is disabled from being resampled by the sampling circuit during an on time of the power switch. A switch conduction scheduling circuit is included in the control circuit and is coupled to the sampling circuit such that the control circuit is coupled to switch the power switch in response to the sampled output of the power converter. | 09-27-2012 |
20120250360 | LLC CONTROLLER WITH PROGRAMMABLE FRACTIONAL BURST FREQUENCY - A controller for use in an LLC resonant converter is disclosed. An example controller is controlled by detecting a maximum frequency signal to set a maximum switching frequency of the LLC resonant converter. A burst stop frequency and a burst start frequency are programmed in response to the maximum switching frequency. The burst stop frequency and the burst start frequency are fractions of the maximum switching frequency. The LLC resonant converter is switched in response to a feedback signal to regulate an output of the LLC resonant converter. The steps of switching the LLC resonant converter in a burst mode in response to the feedback signal reaching a value corresponding to the programmed burst start frequency and of stopping the switching of the LLC resonant converter in the burst mode in response to the feedback signal reaching a value corresponding to the programmed burst stop frequency are repeated. | 10-04-2012 |
20120250361 | DC/DC CONVERTER, POWER CONVERTER AND CONTROL METHOD THEREOF - A DC/DC converter, a power converter and a control method thereof are disclosed, where the DC/DC converter includes an output circuit having a load, a rectangular wave generator having a bridge arm, a resonant tank, a detection unit and a control unit. The bridge arm includes a first and a second switches connected each other. The detection unit detects a signal related to a state of the load. When the state of the load is a light-load or a no-load, the control unit controls ON/OFF state of the first and second switches by pulse width modulation mode to convert an input voltage into at least one rectangular wave for the resonant tank. A duty ratio of the first switch is within a first or second predetermined range, and a duty ratio of the second switch is complementary to the duty ratio of the first switch, whereby a voltage gain of the DC/DC converter is greater than 1. | 10-04-2012 |
20120262954 | OFF LINE RESONANT CONVERTER WITH MERGED LINE RECTIFICATION AND POWER FACTOR CORRECTION - An off line resonant converter with improved power factor and merged line rectification is disclosed. An example off line resonant converter includes a boost storage inductance circuit to be coupled to receive an ac input line voltage. A switcher circuit is coupled to the boost storage inductance circuit. The switcher circuit includes stacked first and second passive switching devices coupled to the boost storage inductance circuit. The switcher circuit further includes stacked first and second active bidirectional switching devices coupled to the stacked first and second passive switching devices. The stacked first and second active bidirectional switching devices are controlled to generate a square wave signal and to alternately store energy in and receive energy from the boost storage inductance circuit such that a pulsating current is conducted between the boost storage inductance circuit and the switcher circuit. The pulsating current is bidirectional and flows in a first direction when the ac input line voltage is at a first polarity. The pulsating current flows in an opposite second direction when the ac input line voltage is at a second polarity. A resonant circuit is coupled to an output of the switcher circuit to receive the square wave signal from the switcher circuit to generate an output of the resonant converter. | 10-18-2012 |
20120262955 | CONVERTER WITH INPUT VOLTAGE BALANCE CIRCUIT - In one aspect of the present invention, a converter circuit with input voltage balance includes a plurality of modules having inputs electrically series-connected to each other and outputs electrically parallel-connected to each other and a plurality of switching circuits with each electrically connected to an input connection node of a corresponding module and its immediate next module, and configured such that when an input voltage of the corresponding module or its immediate next module is in a desired range from a first predetermine value to a second predetermined value greater then the first predetermined value, the switching circuit operates in an open state, while when the input voltage is out of the desired range, the switching circuit operates in a conductive state so as to regulate the input voltage of the corresponding module or its immediate next module in the desired range. | 10-18-2012 |
20120275197 | LAYOUTS OF MULTIPLE TRANSFORMERS AND MULTIPLE RECTIFIERS OF INTERLEAVING CONVERTER - The present invention relates to multi-phase parallel-interleaved converter circuits with each phase having two or more transformers and two or more rectifiers electrically coupled to the two or more transformers, and layouts of the transformers and the rectifiers of the multi-phase parallel-interleaved converter circuits. In the layouts, the multiple transformers and the multiple rectifiers of the multi-phase converters are interleavingly arranged to be symmetrical to common output polarized capacitor(s) so as to ensure the rectifier outputs of each phase relative to the common output polarized capacitors is symmetrical, thereby reducing the output ripples of the current of the output capacitors. | 11-01-2012 |
20120281434 | METHOD AND APPARATUS FOR CONTROLLING RESONANT POWER CONVERTER - A control circuit of a resonant power converter is disclosed. The control circuit comprises a first transistor and a second transistor for switching a transformer and a resonant tank comprising a capacitor and an inductor. A controller is configured to receive a feedback signal correlated to the output of the power converter for generating a first switching signal and a second switching signal to drive the first transistor and the second transistor, respectively. A diode coupled to the first transistor and the resonant tank for detecting the state of the first transistor and generating a detection signal for the controller. The detection signal indicates if the transistors are in a zero voltage switching (ZVS) state. If the transistors are not in the ZVS state, the switching frequency of the transistors will be increased. | 11-08-2012 |
20120281435 | DC-DC CONVERTER - A DC-DC converter ( | 11-08-2012 |
20120287680 | SYSTEMS AND METHODS FOR CONSTANT CURRENT CONTROL IN AN LLC RESONANT POWER REGULATOR - One embodiment relates to an LLC resonant power converter system. The system includes a transformer comprising a primary inductor and a secondary inductor and a switch control stage configured to generate a plurality of switching signals having a duty-cycle. The system also includes an input stage comprising the primary inductor and a plurality of switches that are controlled in response to the respective plurality of switching signals to generate a primary resonant current and an output stage comprising the secondary inductor and being configured to conduct an output current through a load based on a secondary resonant current to generate an output voltage. The system further includes a controller configured to limit a magnitude of the output current to a predetermined magnitude in response to variations of the load. | 11-15-2012 |
20120294047 | Resonant Converter - A resonant converter includes first and second input terminals for applying an input voltage and first and second output terminals for providing an output voltage. A transformer includes a primary winding and a secondary winding, where both the primary winding and the secondary winding have a first and a second terminal. A series resonant circuit includes a capacitive element and the primary winding of the transformer. A switching circuit is connected between the input terminals and the series resonant circuit. A rectifier circuit is connected between the secondary winding and the output terminals. A clamping circuit is connected between one of the first and second terminals of the primary winding and the input terminals. | 11-22-2012 |
20120300503 | CONTROL CIRCUIT WITH ZVS-LOCK AND ASYMMETRICAL PWM FOR RESONANT POWER CONVERTER - A control circuit for a resonant power converter and a control method thereof are disclosed. The control circuit comprises a first transistor and a second transistor switching a transformer through a resonant tank. A controller receives a feedback signal for generating a first switching signal and a second switching signal coupled to drive the first transistor and the second transistor respectively. The feedback signal is correlated to an output of the resonant power converter. A diode is coupled to the second transistor for detecting the state of the second transistor for the controller. The first switching signal and the second switching signal are modulated to achieve a zero voltage switching (ZVS) for the second transistor. | 11-29-2012 |
20120300504 | PARALLEL-CONNECTED RESONANT CONVERTER CIRCUIT AND CONTROLLING METHOD THEREOF - The configurations of a parallel-connected resonant converter circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a plurality of resonant converters, each of which has two input terminals and two output terminals, wherein all the two input terminals of the plurality of resonant converters are electrically series-connected, and all the two output terminals of the plurality of resonant converters are electrically parallel-connected. | 11-29-2012 |
20120314455 | ISOLATED SEPIC POWER CONVERTER FOR LIGHT EMITTING DIODES AND OTHER APPLICATIONS - A system includes a load and a single-ended primary-inductance converter (SEPIC) power converter configured to provide power to the load. The SEPIC power converter includes a primary side and a secondary side that are electrically isolated by a transformer. The transformer includes a primary coil and a secondary coil. The primary side includes (i) a capacitor coupled to a first end of the primary coil and (ii) an inductor and a switch coupled to a second end of the primary coil. The primary side of the SEPIC power converter could also include a diode coupled between the inductor and the switch, where the diode is coupled to the second end of the primary coil. The capacitor could be configured to transfer energy to the secondary side of the SEPIC power converter through the transformer during valleys associated with a rectified input voltage. | 12-13-2012 |
20120314456 | SYNCHRONOUS AC RECTIFIED FLYBACK CONVERTER UTILIZING BOOST INDUCTOR - A flyback converter utilizes a boost inductor coupled between a source of AC power and a synchronous rectifier to provide power factor correction. The synchronous rectifier includes four field-effect transistors configured in a bridge arrangement. Control circuitry controls the on/off states of opposite pairs of the FETs to provide synchronous rectification of the AC power. A primary winding of the flyback transformer is coupled in series with a storage capacitor across the output of the synchronous rectifier. A circuit, which includes a switching transistor, is also coupled across the output of the synchronous rectifier to provide a low resistance path when the switch is closed. The cores of the boost inductor and the transformer are loaded with energy when the switch is closed. When the switch opens, the energy stored in the magnetic cores is transferred to the output via the transformer secondary winding and rectification circuitry. In one embodiment, a separate switching transistor is not used and its function is performed by the rectifier FETs. | 12-13-2012 |
20120314457 | CONTROL ARRANGEMENT FOR A RESONANT MODE POWER CONVERTER - A resonant mode converter includes a PFC power converter having an input coupled to receive an input voltage. An LLC power converter is cascaded with the PFC power converter. The LLC power converter includes a transformer coupled to generate an output of the resonant mode converter. A feedback circuit is coupled to generate a first current representative of the output of the resonant mode converter. A control unit includes a current limiting circuit coupled to receive the first current and a second current generated in response to a reference voltage. The current limiting circuit is coupled to limit the first current in response to the second current. The control unit further includes an oscillator coupled to generate a control signal having a control frequency in response to the first current. The resonant mode converter output is controlled in response to the control frequency. | 12-13-2012 |
20120320635 | MAXIMIZE EFFICIENCY METHOD FOR RESONANT CONVERTER WITH SELF-ADJUSTING SWITCHING POINTS - A maximize efficiency method for resonant converter with self-adjusting switching points is disclosed. The method is operated by a resonant converter, which comprises a transformer and a field effect transistor (FET). When the transistor is turned on, energy is stored in the transformer. When the transistor is turned off, a resonant signal is generated at a drain of the transistor. At this time, a suitable trigger time has to be found to turn on the transistor, so as to reduce switching power loss. The method measures the slope of the resonant signal at the trigger time. This is used as a reference to adjust the next cycle's trigger time. If the slope is negative at the time of trigger, a delta time is added to the trigger time in the next cycle, If the slope is positive, a delta time is subtracted from the trigger time for the next cycle. | 12-20-2012 |
20120320636 | SWITCHING POWER SUPPLY APPARATUS - A control circuit performs at least one of detecting whether the resonance current detected by the current detection unit is beyond a first detection level over a predetermined time period, and detecting, when detecting that the resonance current is beyond the first detection level over the predetermined time period, that the resonance current falls below a second detection level, and detecting whether the resonance current detected by the current detection unit is below a first detection level over a predetermined time period, and detecting, when detecting that the resonance current is below the first detection level over the predetermined time period, that the resonance current exceeds a second detection level, and inverts, when detecting that the resonance current falls below or exceeds the second detection level, the levels of the drive control signal at which the first switching element and the second switching element are turned on or off. | 12-20-2012 |
20120320637 | SWITCHING POWER SOURCE APPARATUS - A switching power source apparatus has a pulse generator of a first pulse. A first resonant series circuit receives the first pulse signal and passes a current having a 90-degree phase delay with respect to the first pulse signal. The current of the first resonant series circuit turns on/off a switching element Q | 12-20-2012 |
20120320638 | RESONANT CIRCUIT AND RESONANT DC/DC CONVERTER - The present disclosure relates to a resonant circuit ( | 12-20-2012 |
20130003423 | MULTI-INPUT BIDIRECTIONAL DC-DC CONVERTER WITH HIGH VOLTAGE CONVERSION RATIO - A multi-input bidirectional DC-DC converter with a high voltage conversion ratio is provided. The multi-input bidirectional DC-DC converter with a high voltage conversion ratio implements phase control loops independent from one another so as to realize independent control of charge and discharge in a plurality of energy storage modules, and thus a failure in one of energy storage modules does not affect the other energy storage modules. In addition, it is possible to easily add or remove a control loop that is controlled independently from other control loops. | 01-03-2013 |
20130010501 | BISYNCHRONOUS RESONANT SWITCHING-TYPE DIRECT CURRENT POWER SUPPLY - A bisynchronous resonant switching-type direct current power supply includes a power supply unit, a power factor correcting unit, a resonant converting unit, and a synchronous rectifying unit. The power supply unit includes a power supply circuit to receive an alternating current signal, and a rectifying-and-filtering circuit operable to obtain a direct current voltage output from the alternating current signal. The power factor correcting unit includes a voltage booster, an active power factor correcting chip circuit and two transistor control circuits. The resonant converting unit includes a power switch circuit, a resonant chip circuit, and a voltage converting circuit. The voltage converting circuit has primary and secondary windings. The synchronous rectifying unit includes first and second resonant bridge rectifier circuits and a supply voltage output circuit. | 01-10-2013 |
20130010502 | SWITCHING REGULATOR AND CONTROL DEVICE THEREOF - A switching regulator related to aspects of the invention can include an auxiliary winding for monitoring the voltage across the primary winding of a transformer, a differentiation detecting circuit that detects the timing of reversal start or reversal end of the signal detected by the auxiliary winding and a dead time adjusting circuit that receives a signal to trigger turn OFF of a switch or a switch and, after passing a predetermined delay time from the detection of the signal, generates a signal to trigger turn ON of the switch or the switch. The differentiation detecting circuit can confirm current transfer between body diodes. The dead time adjusting circuit can adjust a dead time to deliver the signal after a predetermined time from the confirmation of the current transfer. In some aspects of the invention, occurrence of hard switching and short-circuit current can be suppressed. | 01-10-2013 |
20130016533 | RESONANT CONVERTER CONTROLAANM Halberstadt; HansAACI GroesbeekAACO NLAAGP Halberstadt; Hans Groesbeek NL - Consistent with an example embodiment there is a method of controlling a resonant power converter; the power converter includes first and second series connected switches connected between a supply voltage line and a ground line and a resonance circuit, having a capacitor and an inductor. The resonance circuit is connected to a node connecting the first and second switches. The method comprises repeated sequential steps of closing the first switch to start a conduction interval; sampling a voltage across the capacitor to obtain a sampled voltage level; and opening the first switch to end the conduction interval when a voltage across the capacitor crosses a voltage level determined by addition of the sampled voltage level with a predetermined voltage difference; wherein controlling the predetermined voltage difference determines a power output of the resonant power converter. | 01-17-2013 |
20130016534 | RESONANT CONVERTERAANM ISHIKURA; KeitaAACI SaitamaAACO JPAAGP ISHIKURA; Keita Saitama JPAANM ASO; ShinjiAACI SaitamaAACO JPAAGP ASO; Shinji Saitama JP - A resonant converter includes: a first switching element and a second switching element, which are connected in series; a series resonant circuit, which includes a primary coil of a transformer having leakage inductance and a current resonant capacitor, and which is connected in parallel to one of the first switching element and the second switching element; a rectifying-and-smoothing circuit, which is connected to a secondary coil of the transformer, wherein an output voltage is to be supplied to a load; and a clamp circuit, which clamps a voltage between both ends of the current resonant capacitor to a predetermined voltage value, wherein, when an output current supplied from the rectifying-and-smoothing circuit to the load is higher than the predetermined current value, an output characteristic is set so that, as the output current is increased, the output voltage is decreased. | 01-17-2013 |
20130058135 | Adaptive Driver Delay Compensation - Peak current in a switching converter is controlled using a closed loop to compensate for error caused by delay time in the switching transistor and control logic. A reference value is established that represents a target current value. A compensated reference value is derived from the reference value by the closed loop. A periodic inductor current is formed in the switching converter in response to the compensated reference value. An error signal is formed that is indicative of an amount of time the inductor current exceeds the target current value. The compensated reference value is dynamically adjusted by the compensation closed loop to minimize the error signal. | 03-07-2013 |
20130077356 | DC-DC CONVERTERS - A DC-DC converter includes a waveform generator that generates an output waveform for the DC-DC converter based on a DC input voltage. A rectifier rectifies the output waveform from the waveform generator to generate a rectified voltage for the DC-DC converter. A tank circuit having an inductor and a capacitor can be configured to have a resonant frequency that is correlated with a frequency of the output waveform, wherein the capacitor of the tank circuit also functions as a filter for the DC-DC converter. | 03-28-2013 |
20130083564 | RESONANT POWER CONVERSION APPARATUS - A resonant power conversion apparatus including a transformer-based resonant converter and first and second switch control units is provided. The transformer-based resonant converter includes a primary switch circuit and a secondary output circuit configured to provide an output voltage to a load. The first switch control unit is configured to control an ON/OFF operation of the primary switch circuit in response to a status of the load. The second switch control unit is configured to determine whether to activate or inactivate the first switch control unit. When the status of the load is the light-loading or the no-loading, the first switch control unit intermittently controls the ON/OFF operation of the primary switch circuit, and meanwhile, the first switch control unit is inactivated during the primary switch circuit is disabled, so as to substantially reduce the light-loading or no-loading loss of the resonant power conversion apparatus. | 04-04-2013 |
20130094250 | DOWN CONVERTER - A down converter for converting an input DC voltage (Vin) into a lower output DC voltage (Vout). The down converter has on the primary side ( | 04-18-2013 |
20130100709 | Magnetron Power Supply - A power supply for a magnetron has a high voltage converter, a microprocessor and a resistor. The high voltage converter comprises an integrated circuit oscillator, switching transistors, an inductance L | 04-25-2013 |
20130121036 | RESONANT CONVERTING CIRCUIT AND RESONANT CONTROLLER - The resonant converting circuit comprises a resonant circuit, a current detecting circuit and the resonant controller. The resonant controller controls a power conversion of the resonant circuit for converting an input voltage into an output voltage and the resonant controller comprises an over current judgment unit and an over current protection unit. The over current judgment unit determines whether the resonant current is higher than an over current value according to a current detecting signal generated by the current detecting circuit. The over current protection unit generates a protection signal in response to a determined result of the over current judgment unit and an indication signal indicative of an operating state of the resonant controller. The resonant controller executes a corresponding protecting process in response to the protection signal. | 05-16-2013 |
20130148383 | DC-AC CONVERTER AND CONVERSION CIRCUIT - A DC-AC converter is provided. The DC-AC converter includes a time-varying DC power generating circuit, an AC power generating circuit and a transmission capacitor. The time-varying DC power generating circuit is controlled by a pulse width modulation (PWM) signal to transform a DC source into a time-varying DC power. With reference to the time-varying DC power, the AC power generating circuit is controlled by a first polarity switching and a second polarity switching signal to generate an AC power. The transmission capacitor, coupled to the time-varying DC power generating circuit and the AC power generating circuit, transmits the time-varying DC power from the time-varying DC generating circuit to the AC power generating circuit. | 06-13-2013 |
20130148384 | INTEGRATED RESONANCE AND POWER FACTOR CORRECTION CONTROL INTEGRATED CIRCUIT AND POWER CONVERTER - Provided are a resonance and PFC integrated control IC and a power converter. The resonance and PFC integrated control IC includes an interleave PFC control block and a resonance control block. The interleave PFC control block is configured to control first and second switches of an interleave switching converter and correct a power factor. The interleave switching converter includes a first converter comprising the first switch and a second converter comprising the second switch, and the first converter and the second converter are connected in parallel. The resonance control block is configured to resonate and control a Direct Current (DC)-DC converter that receives and converts the output of the interleave switching converter. | 06-13-2013 |
20130163290 | POWER SUPPLY APPARATUS - There is provided an LLC type power supply apparatus for controlling switching of a secondary side rectifier based on primary side current, particularly, controlling switching of the secondary-side rectifier based on primary side resonance current and magnetizing current. The power supply apparatus includes: a switching unit switching input power; a transformer unit transforming the switched power from the switching unit; a rectifying unit including a rectifier turned on and turned off in response to a control signal to rectify the transformed power; a controlling unit controlling the switching of the switching unit, based on an output power of the rectifying unit; and a switching controlling unit controlling turning-on and turning-off of the rectifier of the rectifying unit, based on current flowing in the transformer unit. | 06-27-2013 |
20130170252 | ELECTRIC POWER SUPPLY APPARATUS - An electric power supply apparatus, which enables a driving frequency of a switching circuit connected to a primary side of a transformer constant and output of a secondary side variable, comprises a transformer ( | 07-04-2013 |
20130182462 | LINEAR SYNCHRONOUS RECTIFIER DRIVE CIRCUIT - A drive circuit arranged to drive a synchronous rectifier of a power converter includes a differential amplifier stage connected to the synchronous rectifier and arranged to supply a drive signal to the synchronous rectifier to turn the synchronous rectifier on and off and a high voltage blocking stage connected between the synchronous rectifier and the differential amplifier stage. The differential amplifier stage is arranged such that a voltage level of the drive signal depends on a load of the power converter. | 07-18-2013 |
20130194832 | CONVERTER DRIVING CIRCUIT, DUAL-MODE LLC RESONANT CONVERTER SYSTEM, AND METHOD OF DRIVING DUAL-MODE LLC RESONANT CONVERTER - Disclosed herein are a converter driving circuit for adjusting a variable range of a driving control voltage according to an amplitude and frequency change of a feedback voltage, a dual-mode LLC resonant converter system, and a method of driving the dual-mode LLC resonant converter. | 08-01-2013 |
20130250625 | SWITCHING POWER SUPPLY APPARATUS - In a switching power supply apparatus, a low-side switching device is connected in series with a primary winding. A high-side switching device and the primary winding define a closed loop. A voltage induced in a high-side drive winding is applied to the high-side switching device to turn on the high-side switching device. A transistor, which is turned on/off in accordance with the voltage across a capacitor charged by the voltage induced in the high-side drive winding, is connected to the gate terminal of the high-side switching device. When the capacitor is charged and the transistor is turned on, the high-side switching device is turned off. The capacitor is discharged by the voltage induced in the high-side drive winding, during the ON period of the low-side switching device. | 09-26-2013 |
20130250626 | SWITCHING POWER-SUPPLY CIRCUIT - A switching power-supply circuit includes a transformer, a first switching element, a first rectifying/smoothing circuit generating a first output voltage by rectifying and smoothing the output of a first secondary winding, a second rectifying/smoothing circuit generating a second output voltage by rectifying and smoothing the output of a second secondary winding, a first feedback circuit generating a feedback signal according to the first output voltage, and a first switching control circuit. When the voltage of the second secondary winding is greater than the second output voltage and the second output voltage is less than the voltage of a reference-voltage circuit, a second rectifier circuit turns on a rectifier switch element, and stabilizes the second output voltage by controlling the number of pulses per unit time in a pulse current flowing through the second rectifier circuit. | 09-26-2013 |
20130258720 | RESONANT POWER SUPPLY WITH AN INTEGRATED INDUCTOR - A resonant-mode power supply comprising an integrated inductor (ZER), the integrated inductor (ZER) comprising an inductor (IR) and a transformer (TR). The main internal winding ( | 10-03-2013 |
20130279205 | HOLD-UP TIME ENHANCEMENT CIRCUIT FOR LLC RESONANT CONVERTER - An open loop half-bridge LLC power converter includes circuitry to reliably increase hold-up time without sacrificing efficiency. An LLC resonant circuit includes resonant inductance, a primary transformer winding, and resonant capacitance. An auxiliary circuit includes an auxiliary transformer winding, an inductor, and a third switching element coupled in series. A controller is coupled across a voltage sensor and effective thereby to determine a holdup time condition. In a “normal” operating condition the controller generates switch driver signals to turn OFF the third switching element and disable the auxiliary circuit, and in a hold-up time condition the controller turns ON the third switching element and enables the auxiliary circuit wherein the output voltage is increased via current supplied from the auxiliary winding. In various embodiments the auxiliary winding may be an auxiliary primary or secondary, or a secondary to an auxiliary primary winding of a second transformer. | 10-24-2013 |
20130301305 | LLC CONTROLLER WITH PROGRAMMABLE FRACTIONAL BURST FREQUENCY - A method of controlling an LLC resonant converter includes programming a burst stop frequency and a burst start frequency in response to a maximum switching frequency of the LLC resonant converter. The burst stop frequency and the burst start frequency are fractions of the maximum switching frequency. The LLC resonant converter is switched in response to a feedback signal to regulate an output of the LLC resonant converter. The steps of switching the LLC resonant converter in a run state in response to the feedback signal reaching a value corresponding to the programmed burst start frequency, and stopping the switching of the LLC resonant converter in a stop state in response to the feedback signal reaching a value corresponding to the programmed burst stop frequency are repeated. | 11-14-2013 |
20130301306 | SWITCHING POWER SUPPLY DEVICE - In a switching power supply device with reduced size and increased power conversion efficiency, a secondary-side rectifier circuit includes an adder-rectifier circuit that stores a voltage generated in a secondary winding in a capacitor as electrostatic energy in an on period of one of a high-side and low-side switching circuits or, and adds the voltage in the capacitor and the voltage generated in the secondary winding and outputs the sum as a direct-current voltage during in an on period of the other of the high-side and low-side switching circuits. A switching control circuit adjusts an output power to be output from the secondary-side rectifier circuit, by using on-period ratio controller that controls a proportion of periods during which the respective high-side side and low-side switching elements are brought into a conductive state. | 11-14-2013 |
20130301307 | RESONANT POWER CONVERTER - A resonant power converter includes a resonance tank formed by a capacitance component and an inductance component, at least two switches connected to the resonance tank and a voltages source in a bridge configuration, a number of snubber capacitors connected in parallel to each of the switches, a controller configured to control ON and OFF timings of the at least two switches so as to excite the resonance tank, and a voltage sensor configured to sense a voltage drop across at least one of the switches. The controller is configured to switch the at least one of the switches to the ON state when the absolute value of the sensed voltage drop reaches a minimum. | 11-14-2013 |
20130314951 | RESONANT CONVERTER AND METHODS OF OPERATING - A resonant converter including: a resonant tank, a switching circuit that connects the resonant tank to a power supply according to a first switching sequence, a synchronous rectifier circuit that supplies power to an output, wherein the rectifier circuit is switched according to a second switching sequence, and a phase delay module arranged to delay the second switching sequence with respect to the first switching sequence to achieve a desired power output, and a method of controlling the same. | 11-28-2013 |
20130329464 | DIGITAL POWER CONTROL CIRCUIT FOR POWER CONVERTER AND CONTROL CIRCUIT FOR POWER CONVERTER - A control circuit for a power converter and a digital power control circuit for a power converter are provided. The control circuit comprises a microcontroller, an oscillation circuit, an analog-to-digital converter and a signal generator. The microcontroller comprises a flash memory. The oscillation circuit comprises a phase lock loop for generating a clock signal. The analog-to-digital converter generates a digital feedback signal for the microcontroller corresponding to an output of the power converter. The signal generator is configured to receive the clock signal and data of the microcontroller for generating a switching signal. The switching signal is configured to switch a transformer for regulating the output of the power converter corresponding to the output of the microcontroller. | 12-12-2013 |
20130336016 | SWITCHING POWER-SUPPLY DEVICE - A half-bridge converter circuit generates an output voltage from an input voltage, by switching first and second FETs. A subsequent-stage switching control circuit alternately subjects the first and second FETs in the half-bridge converter circuit to on/off control with a fixed on-duty ratio and with a switching frequency corresponding to the weight of a load and a dead time sandwiched therebetween. A boost converter circuit includes an inductor, a smoothing capacitor, and a third FET switching the energization of the inductor. A previous-stage switching control circuit subjects the third FET in the boost converter circuit to on/off control with a controlled on-duty ratio, and adjusts the output voltage of the half-bridge converter circuit. | 12-19-2013 |
20130336017 | SWITCHING POWER-SUPPLY DEVICE - A resonant converter circuit generates an output voltage from an input voltage by switching first and second FETs. A subsequent-stage switching control circuit alternately subjects the first and second FETs in the resonant converter circuit to on/off control with a fixed on-duty ratio and a fixed switching frequency. A boost converter circuit includes an inductor, a smoothing capacitor, and a third FET arranged to switch the energization of the inductor. A previous-stage switching control circuit subjects the third FET in the boost converter circuit to on/off control with a controlled on-duty ratio, and adjusts an output voltage to the resonant converter circuit. | 12-19-2013 |
20130343096 | CONTROL CIRCUIT FOR A RESONANT CONVERTER OR THE LIKE AND METHOD THEREFOR - An integrated circuit includes a first pin for receiving a feedback signal, a second pin for receiving a current signal indicative of a current in a primary of a transformer, and a switching circuit coupled to the first and second pins and responsive to the feedback signal to determine a frequency at which to provide an upper drive signal and a lower drive signal, and further responsive to the current signal to change a value of the feedback signal when the current signal exceeds a first threshold, and to stop providing the upper and lower drive signals when the current signal exceeds a second threshold, the second. threshold higher than the first threshold. | 12-26-2013 |
20130343097 | SWITCHING POWER SUPPLY - A switching power supply achieves simultaneously achieves suppression of surge voltage and satisfactory transient response. The switching power supply comprises a switching element connected to a primary winding of an isolation transformer, a resonance capacitor connected to the switching element, an output capacitor connected to a secondary winding of the isolation transformer through a rectifying diode, and a control circuit ON/OFF driving the switching element. The control circuit includes a restart circuit that delivers a restart signal to turn ON the switching element after a predetermined time from turning OFF of the switching element has passed. The control circuit also includes an initial operation setting circuit that sets a delay time in the restart circuit to be longer in a start up period of the power supply than in a normal operation time after the end of the startup period. | 12-26-2013 |
20140003094 | POWER SUPPLY COMPRISING A STAND BY FEATURE | 01-02-2014 |
20140016361 | Circuit Arrangement with a Rectifier Circuit - A rectifier circuit includes first and second load terminals, a first semiconductor device having a load path and configured to receive a drive signal, and a plurality of second semiconductor devices each having a load path and each configured to receive a drive signal. The load paths of the second semiconductor devices are connected in series, and connected in series to the load path of the first semiconductor device. A series circuit with the first semiconductor device and the second semiconductor devices is connected between the load terminals. Each of the second semiconductor devices is configured to receive as a drive voltage either a load-path voltage of at least one of the second semiconductor devices, or a load-path of at least the first semiconductor device. The first semiconductor device is configured to receive as a drive voltage a load-path-voltage of at least one of the second semiconductor devices. | 01-16-2014 |
20140016362 | BURST-MODE CONTROL METHOD FOR LOW INPUT POWER CONSUMPTION IN RESONANT CONVERTERS AND RELATED CONTROL DEVICE - An effective method enhances energy saving at low load in a resonant converter with a hysteretic control scheme for implementing burst-mode at light load. The method causes a current controlled oscillator of the converter to stop oscillating when a feedback control current of the output voltage of the converter reaches a first threshold value, and introduces a nonlinearity in the functional relation between the frequency of oscillation and said feedback control current or in a derivative of the functional relation, while the control current is between a lower, second threshold value and the first threshold value, such that the frequency of oscillation remains equal or smaller than the frequency of oscillation when the control current is equal to the second threshold value. Several circuital implementations are illustrated, all of simple realization without requiring any costly microcontroller. | 01-16-2014 |
20140016363 | SWITCHING POWER SUPPLY - Aspects of the invention provide a switching power supply that exhibits an improved conversion efficiency. In aspects of the invention, a load condition detecting circuit sets a threshold voltage for determining the magnitude of the load on the DC-DC converter based on the maximum value of the output voltage of the power factor correction converter in a suspended period of the power factor correction converter. An operation permission signal is delivered when a feedback voltage that indicates the magnitude of the load of the DC-DC converter exceeds the threshold voltage. When the feedback voltage exceeds a threshold voltage that is set at a value higher than the threshold voltage, the operation permission signal is delivered. | 01-16-2014 |
20140016364 | SWITCHING POWER SUPPLY DEVICE - In some aspects of the invention, a load state detecting circuit is configured so that a threshold voltage for determining the size of a load of a DC-DC converter is set in the load state detecting circuit based on a maximum value of an output voltage of a power factor correction converter in an operation-stopped state of the power factor correction converter, so that the load state detecting circuit outputs an operation-enable signal when a feedback voltage indicating the size of the load of the DC-DC converter exceeds the threshold voltage. Thus, by way of some aspects of the invention, it is possible to provide a switching power supply device which can control enabling and stopping operation of a power factor correction converter reliably in accordance with a load state of a DC-DC converter obtaining a predetermined DC output voltage by switching an output voltage of the correction converter. | 01-16-2014 |
20140016365 | CONTROL CIRCUT OF A QUASI-RESONANCE SWITCHING POWER SUPPLY - Aspects of the provide a control circuit of a quasi-resonant switching power supply in which the switching frequency can be adequately reduced under a light load condition. Some aspects include a control circuit of a quasi-resonant switching power supply that performs switching operation of a switching element based on a bottom detection signal. The control circuit of the switching power supply can include a dummy signal generating circuit that generates a dummy signal for replacing the bottom detection signal when the bottom detection becomes unable due to damping of a resonant waveform with decrease of switching frequency, or when the number of bottoms in the resonant waveform exceeds a predetermined times. The use of the dummy signal can increase the number of skips and thus, reduces the switching frequency. | 01-16-2014 |
20140029312 | HIGH POWER CONVERTER ARCHITECTURE - The power converter is an integration of three topologies which include a forward converter topology, a flyback converter topology, and a resonant circuit topology. The combination of these three topologies functions to transfer energy using three different modes. A first mode, or forward mode, is a forward energy transfer that forwards energy from the input supply to the output load in a manner similar to a forward converter. A second mode, or flyback mode, stores and releases energy in a manner similar to a flyback converter. A third mode, or resonant mode, stores and releases energy from the resonant tank using a resonant circuit and a secondary side forward-type converter topologies. An output circuit of the power converter is configured as a forward-type converter including two diodes and an inductor. The output circuit is coupled to a secondary winding of a converter transformer. | 01-30-2014 |
20140029313 | HIGH POWER CONVERTER ARCHITECTURE - The power converter is an integration of three topologies which include a forward converter topology, a flyback converter topology, and a resonant circuit topology. The combination of these three topologies functions to transfer energy using three different modes. A first mode, or forward mode, is a forward energy transfer that forwards energy from the input supply to the output load in a manner similar to a forward converter. A second mode, or flyback mode, stores and releases energy in a manner similar to a flyback converter. A third mode, or resonant mode, stores and releases energy from the resonant tank using a resonant circuit and a secondary side forward-type converter topologies. | 01-30-2014 |
20140036546 | POWER SUPPLY APPARATUS, IMAGE FORMING APPARATUS, AND INTEGRATED CIRCUIT - The power supply apparatus is configured to detect the output voltage of a piezoelectric transformer and controls the frequency of a pulse signal to drive the piezoelectric transformer based on the detected output voltage and a preset target voltage so as to perform feedback control of the output voltage of the piezoelectric transformer, the gain when performing the feedback control is switched in accordance with the target voltage. | 02-06-2014 |
20140036547 | POWER SUPPLY DEVICE - A power supply device includes a control unit performing PFM control for a switching element, a voltage detection unit detecting an output voltage of a converter, and a signal generation circuit. The control unit calculates a first control command value based on the output voltage, calculates a new first control command value adjusting the output voltage to a target voltage, calculates a difference value therebetween, and outputs a voltage, which has a polarity corresponding to the difference value, for a first output period corresponding to the difference value. The signal generation circuit generates a pulse signal in which a frequency increases or decreases in accordance with a first command value voltage corresponding to a charged voltage at a storage element according to the new first control command value. The switching element is driven by the pulse signal that has a finer adjustment unit frequency. | 02-06-2014 |
20140056034 | DC/DC CONVERTER, ELECTRONIC APPARATUS HAVING THE SAME AND DC/DC CONVERSION METHOD THEREOF - A multi-output DC/DC converter, which may be included in an electronic apparatus, performs sync switching control using a simplified configuration. The DC/DC converter may include a first switching unit which alternately switches input DC power and converts the DC power into AC power, a converter which converts the AC power and outputs first power and second power, a first output unit which receives the first power and outputs an output voltage, a second output unit which includes a second switching unit, and receives and switches the second power through the second switching unit and outputs an output voltage, and a controller which detects a voltage applied to a winding wire of the first output unit, generates a sync signal by using the detected voltage, compares the sync signal with a predetermined reference and controls the second switching unit to synchronize the second switching unit with the first switching unit. | 02-27-2014 |
20140063863 | ENERGY TRANSFER ASSEMBLY WITH TUNED LEAKAGE INDUCTANCE AND COMMON MODE NOISE COMPENSATION - An energy transfer assembly includes first and second windings wound around a bobbin. The first winding has a first number of layers proximate to a first end and a second number of layers proximate to a second end of the bobbin. The second winding has a third number of layers proximate to the first end and a fourth number of layers proximate to the second end. At least a portion of one of the first and second windings overlaps at least a portion of the other one of the first and second windings. A degree of overlap between the first and second windings is non-uniform. An isolation barrier is between the first and second windings and around the bobbin. A distance between the isolation barrier and an axis of the bobbin varies along the length of the bobbin. | 03-06-2014 |
20140078787 | SWITCHING POWER SOURCE DEVICE - A switching power source device IS capable of guaranteeing a normal switching operation even when the input of a coil voltage used for adjusting a dead time is eliminated. The switching power source device includes a dead time adjustment circuit that generates an ON trigger signal that regulates an ON timing of one of the first and second switching elements after elapse of a predetermined dead time from an OFF timing of the other switching element and that adjusts the dead time according to a temporal change of a terminal voltage detected from an auxiliary coil of an inductor; and a disable control circuit that detects a temporal change of the coil voltage during activation and disables a function of the dead time adjustment circuit adjusting the dead time when the coil voltage does not temporally change. | 03-20-2014 |
20140098574 | SWITCHING POWER SUPPLY DEVICE - A switching power supply includes a series resonant circuit that includes a resonant inductor and a resonant capacitor connected in series with a primary winding of a converter transformer. By controlling turning on and off of first and second switching elements in a complementary manner, current is supplied to the series resonant circuit. A third switching element connected on the secondary side of the converter transformer is synchronized with the first switching element, and a fourth switching element is synchronized with the second switching element. If a switching frequency is less than a resonant frequency, turning on of the third and fourth switching elements is synchronized with turning on of the first and second switching elements, and turning off of the third and fourth switching elements is controlled, without being synchronized with turning off of the first and second switching elements, after half a resonant period has elapsed. | 04-10-2014 |
20140098575 | High Voltage DC/DC Converter With Cascaded Resonant Tanks - A converter, for use in high voltage direct and alternating current power transmission comprises a primary charge transfer converter. The charge transfer converter includes first and second primary terminals for connection to one or more electrical networks. The primary charge transfer converter also includes a plurality of charge transfer elements and a plurality of primary switching elements which are connected in a cascade circuit between the first and second primary terminals. Each charge transfer element includes at least one resonant circuit. The primary switching elements are operable to selectively cause charging and discharging of each resonant circuit to transfer charge between the charge transfer elements and thereby create a voltage difference between the first and second primary terminals. | 04-10-2014 |
20140104893 | ISOLATED INTERLEAVED DC CONVERTER - An isolated interleaved DC converter has a main circuit architecture integrating a transformer, a dual-phase interleaved step-up circuit, a voltage type auto charge pump circuit with a double-voltage rectifier circuit. The circuit of the invention integrates with the transformer, and combines the dual-phase interleaved boost circuit and the voltage type auto charge pump circuit at a primary side of the transformer to reduce the input current ripple. At a secondary side of the transformer, the circuit of the invention further combines the double-voltage rectifier circuit. The active switching elements can be further integrated in the dual-phase interleaved boost circuit to realize the soft switching technology while reducing EMI and the switching loss and increasing the circuit conversion efficiency. | 04-17-2014 |
20140112026 | RESONANT DC CONVERTER - A resonant DC converter, combines a voltage type auto charge pump circuit with a full-bridge or half-bridge resonant DC conversion circuit at a primary side of a transformer, combines a double-voltage rectifier circuit at a secondary side of the transformer, and grants the circuit of the invention with characteristics of variable circuit architecture by means of the design of circuit parameters and the action of the LC resonant circuit. Integration of switching elements of the converter circuit and the use of characteristics of automatically changing the circuit architecture contribute to reduce the switching losses and increase the circuit conversion efficiency. Low output voltage ripple enables the circuit of the invention to avoid using large-capacitance electrolytic capacitors and be able to extend the service life of the transformer. The operation of the circuit of the invention at boost or buck mode can be controlled by adjusting the circuit parameters. | 04-24-2014 |
20140119062 | SWITCHING POWER SUPPLY - A switching power supply determines the order n (a natural number) of the power supply higher harmonic component near the receiving frequency fc of an AM radio broadcast, and judges whether the higher harmonic component of the order n is higher or lower than the receiving frequency fc of the AM radio broadcast. According to the judgment result, the switching power supply determines an upper limit value and a lower limit value for the power supply frequency fs that does not interfere with the receiving frequency fc of the AM radio broadcast from the values of the fundamental power supply frequency fso of the switching operation, the order n of the higher harmonic component, the receiving frequency fc of the AM radio broadcast, and the bandwidth BW of the receiving frequency. The power supply frequency fs is set within the range specified by the upper and lower limit values. | 05-01-2014 |
20140133189 | RESONANT-MODE POWER SUPPLY WITH A MULTI-WINDING INDUCTOR - A resonant-mode power supply, comprising an assembly of switches connected in a bridge or a half-bridge configuration, a series resonant circuit connected in the bridge or half bridge diagonal, a part of which is formed by a multi-winding inductor by means of which a load is connected, and a controller configured to stabilize output voltages or currents by controlling the switching frequency of the assembly of switches. The series resonant circuit comprises an energy recirculation circuit (ERC1) for limiting the resonant circuit quality factor, connected through the diode rectifier (DR2) to the supply voltage node and a current monitoring circuit (CMC) configured to monitor the recirculation circuit current (Ilim) and, by means of the controller (C), to change the switching frequency of the assembly of switches (K1, K2, K3, K4) in order to reduce power supplied to the resonant circuit upon exceeding the threshold value by the current (Ilim) in the energy recirculation circuit (ERC1). | 05-15-2014 |
20140146576 | DUAL GATE DRIVE CIRCUIT FOR REDUCING EMI OF POWER CONVERTERS AND CONTROL METHOD THEREOF - A dual gate drive circuit for a power converter and a control method are provided for reducing EMI of the power converter. The dual gate drive circuit comprises a switch and a switching control circuit. The switch is coupled to a transformer of the power converter to switch the transformer for regulating an output of the power converter. The switching control circuit generates a first switching signal and a second switching signal in response to a feedback signal to switch the switch for switching the transformer. The feedback signal is correlated to the output of the power converter. The second switching signal is enabled after a time delay once the first switching signal is enabled. | 05-29-2014 |
20140146577 | SWITCHING POWER SUPPLY APPARATUS - A resonant capacitor and an inductor are connected in series between a primary winding of a transformer and a second switching element. A first rectifying and smoothing circuit including a first rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a first secondary winding of the transformer, and takes out a first output voltage. A second rectifying and smoothing circuit including a second rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a second secondary winding of the transformer, and takes out a second output voltage. A control circuit controls an on-time of a first switching element and an on-time of the second switching element in accordance with the first output voltage and the second output voltage, respectively. | 05-29-2014 |
20140153293 | Double-Output Half-Bridge LLC Serial Resonant Converter - The present invention relates to a double-output half-bridge LLC serial resonant converter, comprising: a half-bridge rectifying unit, a first resonant unit, a first transformer unit, a first rectifying unit, a first output unit, a second resonant unit, a second transformer unit, a second rectifying unit, a second output unit, a voltage dividing unit, a voltage regulating unit, a light-coupling isolation unit, and a control unit. In the present invention, the double-output half-bridge LLC serial resonant converter has an inventive circuit framework, which can not only solve the unbalance load current and the output voltage cross regulation occurred in the conventional double-output convertor, but also normally modulate the no-load or light-load output voltage; therefore the output voltage deviation can be effectively controlled. | 06-05-2014 |
20140160805 | HYSTERETIC-MODE PULSE FREQUENCY MODULATED (HM-PFM) RESONANT AC TO DC CONVERTER - The disclosed embodiments provide an AC/DC power converter that converts an AC input voltage into a DC output voltage. This AC/DC power converter includes an input rectifier stage which rectifies an AC input voltage into a first rectified voltage. The AC/DC power converter also includes a switching resonant stage which is directly coupled to the output of the input rectifier stage. The switching resonant stage converts the rectified voltage into a first high frequency AC voltage of a first amplitude. This AC/DC power converter additionally includes a transformer which is coupled to the output of the switching resonant stage and is configured to down-convert the first high frequency AC voltage into a second high frequency AC voltage of a second amplitude. Furthermore, the AC/DC power converter includes an output rectifier stage which is coupled to the output of the transformer, wherein the output rectifier stage rectifies the second high frequency AC voltage into a DC output voltage. | 06-12-2014 |
20140160806 | MULTI-OUTPUT POWER SUPPLY APPARATUS - There is provided a multi-output power supply apparatus capable of maintaining multiple output voltages in a balanced state by limiting a variable range of a switching duty according to a load state. The multi-output power supply apparatus includes: a power supply unit switching input power to output a plurality of voltages whose power levels are determined according to the switching operation; and a controller detecting power states of at least some of the plurality of voltages from the power supply unit, and limiting a range of a switching duty of the power supply unit to a pre-set range when the detected power states correspond to a pre-set limited power state. | 06-12-2014 |
20140160807 | POWER SUPPLY APPARATUS - There is provided a power supply apparatus capable of precisely control a primary side switching frequency at a secondary side by receiving fed-back information regarding a power state at the secondary side without a separate expensive circuit or a complicated circuit. The power supply apparatus includes: a power supplying unit having a primary side and a secondary side having different ground electrical characteristics, switching power input to the primary side, and transferring the switched power to the second side electrically insulated from the primary side to supply the power; a controlling unit provided on the secondary side and receiving fed-back information regarding a power state of the power supplying unit to control a maximum value and a minimum value of a switching frequency of the primary side; and a transferring unit transferring a control signal from the controlling unit to the primary side of the power supplying unit. | 06-12-2014 |
20140160808 | DC/DC CONVERTER, CONTROL CIRCUIT THEREOF, POWER SUPPLY, POWER ADAPTER AND ELECTRONIC APPARATUS USING THE SAME - A control circuit of a DC/DC converter having a transformer, a switching transistor, and a detector includes: a feedback terminal receiving a feedback voltage corresponding to an output voltage of the DC/DC converter; a current detection terminal receiving a detection voltage generated in the detection resistor; a conversion circuit configured to amplify, attenuate and/or level-shift at least one of the feedback voltage and the detection voltage, wherein a gain and/or a shift of the conversion circuit are variable; and a gain controller configured to control the gain and/or the shift of the conversion circuit. | 06-12-2014 |
20140185330 | DC to DC POWER CONVERTING DEVICE - A power converting device includes a switching unit, a resonant unit, a converting unit, a rectifying and filtering unit, an inductance-sensing unit, and a driver. The resonant unit is electrically connected to the switching unit and includes a resonant capacitor, a resonant inductor, and a variable magnetizing-inductor having at least two inductances, the resonant inductor is electrically connected to the resonant capacitor and the variable magnetizing-inductor. The converting unit is electrically connected to the resonant unit. The rectifying and filtering unit is electrically connected to the converting unit. The inductance-sensing unit is electrically connected to the rectifying and filtering unit, the inductance-sensing unit instantaneously senses inductances of the variable magnetizing-inductor. The driver is electrically connected to the inductance-sensing unit and the switching unit, the driver is configured for controlling a switching frequency of the switching unit according to an inductance instantaneously sensed by the inductance-sensing unit. | 07-03-2014 |
20140204622 | RECONSTRUCTION PULSE SHAPE INTEGRITY IN FEEDBACK CONTROL ENVIRONMENT - A switched mode power converter includes a closed loop feedback control mechanism for regulating an output characteristic and a resonant type circuit for inclusion of resonant energy delivery. The characteristic impedance of the resonant type circuit is modified from an optimal energy transfer configuration to one that dampens fluctuations in a feedback signal used by the closed loop feedback mechanism. The modified characteristic impedance functions to dampen those fluctuations in the feedback signal resulting from leakage inductance energy provided by the resonant type circuit. | 07-24-2014 |
20140211515 | DC-DC CONVERTER AND POWER SUPPLY DEVICE HAVING DC-DC CONVERTER - A DC-DC converter is configured with a step-down converter that outputs a output voltage having the same voltage value as an input voltage when a step-down operation stops and that outputs the first output voltage having a lower voltage value than the input voltage when the step-down operation is performed, and a resonant converter in which a voltage transfer factor is adjusted by a switching frequency of a switching element through which a resonance current flows. A step-down operation of the step-down converter is performed when the switching frequency, the voltage transfer factor and a target value for the output voltage satisfy a predetermined condition. According to the above configuration, it is possible to decrease switching loss of the step-down converter. | 07-31-2014 |
20140233267 | POWER CONVERTER AND METHOD OF CONVERTING POWER - A power converter and a method of converting power are provided. The power converter includes a resonant converting circuit and a control circuit. The resonant converting circuit converts an input power into an output power, and provides the output power to a load. The control circuit receives a feedback signal corresponding to the output power and the load, and outputs a driving signal according to the feedback signal to drive the resonant converting circuit. The control circuit selectively adjusts a duty period and an operating frequency of the driving signal according to a power required by the load. | 08-21-2014 |
20140247626 | HOLD-UP TIME ENHANCEMENT CIRCUIT FOR LLC RESONANT CONVERTER - An open loop half-bridge LLC power converter includes circuitry to reliably increase hold-up time without sacrificing efficiency. An LLC resonant circuit includes resonant inductance, a primary transformer winding, and resonant capacitance. An auxiliary circuit includes an auxiliary transformer winding, an inductor, and a third switching element coupled in series. A controller is coupled across a voltage sensor and effective thereby to determine a holdup time condition. In a “normal” operating condition the controller generates switch driver signals to turn OFF the third switching element and disable the auxiliary circuit, and in a hold-up time condition the controller turns ON the third switching element and enables the auxiliary circuit wherein the output voltage is increased via current supplied from the auxiliary winding. In various embodiments the auxiliary winding may be an auxiliary primary or secondary, or a secondary to an auxiliary primary winding of a second transformer. | 09-04-2014 |
20140254208 | Auxiliary Resonant Apparatus for LLC Converters - A resonant tank comprises a series resonant inductor coupled to a switching network and a transformer, a series resonant capacitor coupled to the switching network and the transformer, a first parallel inductor implemented as a magnetizing inductance of the transformer, a second parallel inductor implement as a separate inductor, wherein a first inductance of the first parallel inductor is greater than a second inductance of the second parallel inductor and a switch connected in series with the second parallel inductor. | 09-11-2014 |
20140268902 | SINGLE STAGE BOOST-ASYMMETRIC LLC - An AC/DC power converter utilizing a single stage boost-asymmetric LLC topology is disclosed. The converter uses a combined pulse width modulation (PWM) and frequency modulation (FM) to achieve dual control for a single main magnetic element (transformer). The transformer provides an output voltage regulation throughout the primary-secondary isolation operating in resonant mode (LLC) by means of frequency modulation, while at the same time its magnetizing inductance is conditioning the input current and providing a boosted high voltage for energy storage purpose by means of duty cycle control. A single pair of complementary primary switches is used to drive the primary winding of the transformer in order to achieve both voltage regulation and power conditioning. The secondary side capacitors and the resonant inductor, which may be either integrated into the transformer or external to the transformer, achieve the resonant function of the transformer. | 09-18-2014 |
20140268903 | System and Method for a Switched-Mode Power Converter - In accordance with an embodiment, a power converter includes an H-bridge switching arrangement, a transformer having a primary winding coupled to an output of the H-bridge switching arrangement, a first switch coupled between a power input of the H-bridge switching arrangement and a first power supply node, and a second switch coupled between a center-tap of the primary winding of the transformer and a low impedance node. | 09-18-2014 |
20140268904 | METHODS AND SYSTEMS FOR CALIBRATING A RESONANT CONVERTER - Methods and systems for calibrating an inductor-inductor-capacitor (LLC) resonant converter are provided herein. The method includes calculating input voltage mathematically as a function of at least one of an output voltage, a load current, and tolerances of components of the LLC resonant converter and operating the LLC resonant converter in an open loop mode at a nominal resonant frequency. The method also includes measuring output voltage of the LLC resonant converter and comparing the measured output voltage to the calculated input voltage. | 09-18-2014 |
20140268905 | METHODS AND SYSTEMS FOR IMPROVING LOAD TRANSIENT RESPONSE IN LLC CONVERTERS - Methods and systems for improving load transient response in LLC converters are provided herein. The method includes coupling a current sensing circuit to an output of the LLC converter, sensing load current of the LLC converter, and increasing a setpoint voltage for a power factor correction (PFC) circuit output based on the sensed load current. | 09-18-2014 |
20140268906 | INTERLEAVED LLC CONVERTERS AND CURRENT SHARING METHOD THEREOF - Methods and systems for current sharing using interleaved LLC power converters are described herein. The method provides for current sharing between a first LLC power converter interleaved with a second LLC power converter. The method includes determining an expected output voltage for at least one of the first and second LLC power converters and measuring an output voltage of at least one of the first and second LLC power converters. The method also includes increasing a dead-time of at least one of the first and second LLC power converters when the measured output voltage exceeds the expected output voltage. Finally, the method includes interleaving the first and second LLC power converters, wherein an output current of the first LLC power converter is substantially equal to an output current of the second LLC power converter. | 09-18-2014 |
20140268907 | MULTIPHASE CONVERTER WITH ACTIVE AND PASSIVE INTERNAL CURRENT SHARING - A multiphase DC-DC converter includes multiple groups of first and second LLC power trains coupled in parallel which collectively provide an output voltage to a load. A voltage feedback control loop senses an output voltage for the LLC converter and generates an identical reference current signal for each of the multiple groups of power trains, the signals representing a reference current based on the sensed output voltage, wherein an active current sharing operation is provided between each of the groups. A local current control loop for each of the groups generates PWM control signals to each of the respective first and second power trains based on the reference current, the PWM control signals having an identical frequency but out of phase with respect to each other, wherein a passive current sharing operation is provided within each of the plurality of power groups. | 09-18-2014 |
20140293658 | POWER CONVERTER AND POWER CONVERSION METHOD - A power converter includes a switching circuit, a power conversion circuit that receives an input voltage via the switching circuit and converts the input voltage into an output voltage, an input voltage sense circuit that detects the input voltage and generates an input voltage sense signal, and a PWM controller that adjusts a duty cycle of the switching circuit based at least in part on the input voltage sense signal. The power converter also includes an output sense circuit that detects the output voltage and generates an output voltage sense signal, wherein the PWM controller adjusts the duty cycle of the switching circuit based at least in part on the input voltage sense signal and the output voltage sense signal. | 10-02-2014 |
20140307482 | Apparatus and Method for Resonant Converters - A method for improving a power converter's efficiency comprises providing a resonant converter, wherein the resonant converter comprises an input coupled to a power source, a plurality of power switches coupled to the input, a resonant tank coupled to the plurality of power switches and a controller coupled to the power switches and generating a plurality of gate drive signals for the power switches, wherein the gate drive signals are arranged such that a switching frequency of the resonant converter is in a frequency band. | 10-16-2014 |
20140307483 | Power Converters And Methods Of Improving Efficiency Thereof - A multi-stage power converter includes a pre-regulator circuit configured to provide a regulated output voltage, at least one DC/DC converter, and a control circuit coupled to the pre-regulator circuit and the DC/DC converter. The DC/DC converter is configured to provide an output voltage and an output current to a load. The DC/DC converter includes an input, an output, and at least one power switch. The input of the DC/DC converter is coupled to the pre-regulator circuit. The control circuit is configured to regulate the output voltage of the DC/DC converter and vary the regulated output voltage of the pre-regulator circuit as a function of the output current of the DC/DC converter. | 10-16-2014 |
20140313790 | Optimal Trajectory Control for LLC Resonant Converter for Soft Start-Up - By setting switching instants of a switching circuit of a resonant power converter based on current in a resonant circuit reaching a current limit of a current limitation band, soft start-up of the power converter can be achieved to avoid or limit electrical stress with full control over a trade-off between time required to settle to a full load steady-state mode of operation and the amount of electrical stress permitted while soft start up switching frequency is automatically optimized. | 10-23-2014 |
20140321168 | RESONANCE-TYPE POWER SUPPLY APPARATUS - There is provided a resonance-type power supply apparatus capable of controlling primary side switching by estimating output power based on resonance current of the primary side. The resonance-type power supply apparatus includes a switching unit switching input power, a transformer including a primary winding receiving the power switched by the switching unit and a secondary winding magnetically coupled to the first winding and having a preset turns ratio, and transforming the received switched power according to the turns ratio, a resonance unit electrically connected between the switching unit and the transformer and providing a resonance tank resonating with inductance from the transformer, and a controlling unit controlling the switching of the switching unit based on resonance power information input to the primary winding of the transformer by the resonance unit. | 10-30-2014 |
20140321169 | CIRCUIT CONFIGURATION HAVING A RESONANT CONVERTER, AND METHOD FOR OPERATING A RESONANT CONVERTER - A circuit configuration contains a resonant converter feeding energy into a primary winding of a transformer, a control circuit for controlling the resonant converter and a plurality of modules. The modules include a frequency generator controllable with variable frequency, a short circuit monitoring unit configured to protect components of the resonant converter, and an open circuit detection unit. The open circuit detection unit is configured to shut down the resonant converter if a secondary side interacting with the primary winding of the transformer is open circuit, without having information from the secondary side. | 10-30-2014 |
20140334194 | Resonant Transition Controlled Flyback - A new and useful method and inductive circuit is provided that provides a resonant transition control that involves shorting the winding of an inductor or transformer to delay the natural ringing transition. The present invention provides for controlling the natural ring of an inductive circuit has a choke that stores and releases energy, a switch device having a closed state in which it causes the choke to store energy and another switch device having a closed state in which it causes the choke to release energy. The inductive circuit is configured with parasitic capacitance that would normally produce natural ringing when energy in the choke has been substantially released. The invention is characterized in that it provides for shorting the choke to trap and hold current and pause the natural ringing until power is directed to the inductive circuit to release shorting of the choke and initiate storage of energy in the choke. | 11-13-2014 |
20140340942 | RESONANT POWER CONVERSION CIRCUIT - An apparatus and system for power conversion. In one embodiment, the apparatus comprises a transformer having a primary winding and a plurality of secondary windings; and a cyclo-converter comprising a plurality of switch pairs for converting an alternating current to an AC current, wherein each switch pair in the plurality of switch pairs (i) is coupled between two lines of an AC output and (ii) has a different secondary winding of the plurality of secondary windings coupled between its switches. | 11-20-2014 |
20140369081 | POWER CONVERTER - LLC power converters are disclosed that operate in the soft switching region and are defined by a range of frequencies within which soft switching occurs. The LLC power converters include an LLC tank circuit in which the values of the inductors and the capacitors are scaled by a frequency scaling factor and a power scaling factor based on selected design parameters for the LLC power converter. The switching frequency of the disclosed LLC power converters can be varied by an output voltage to switching frequency controller. | 12-18-2014 |
20140369082 | POWER SUPPLY DEVICE - There is provided a power supply device, including an insulating direct current to direct current (DC/DC) converter unit including a primary side winding and a secondary side winding inductively coupled to the primary side winding and inducing a voltage in the secondary side winding in a first direction or a second direction, and a boost unit including a first boost converter boosting the voltage induced in the secondary side winding, in a first mode in which the voltage is induced in the secondary side winding in the first direction, and a second boost converter boosting the voltage induced in the secondary side winding, in a second mode in which the voltage is induced in the secondary side winding in the second direction. | 12-18-2014 |
20140376272 | CONTROL CIRCUIT FOR A SYNCHRONOUS RECTIFICATION CIRCUIT, LLC RESONANT CONVERTER AND ASSOCIATED METHOD - A control circuit for a synchronous rectification circuit, a LLC resonant converter and a control method. The control circuit has a first comparing circuit, a second comparing circuit, a blanking circuit, a first logic circuit and a second logic circuit. The blanking circuit is configured to provide a first blanking signal and a second blanking signal to avoid one or more repeated conduction of a first synchronous rectifier and a second synchronous rectifier respectively, and the first blanking signal and the second blanking signal are logic complementary. | 12-25-2014 |
20140376273 | SWITCHING POWER SUPPLY APPARATUS - In a switching power supply apparatus, when it is detected at time t1 that a voltage Vis has exceeded a first threshold Vth1, a timer counting a period of time T1 is started, and the number times the input voltage Vis does not exceed Vth1 is started to be counted. When the timer expires before the count reaches a predetermined number, a first overcurrent protection operation is performed. When it is detected at time t2 that Vis has exceeded a second threshold Vth2, a second overcurrent protection operation is immediately performed. As a result, appropriate overcurrent protection is performed in accordance with the operating state of a load. | 12-25-2014 |
20140376274 | SWITCHING POWER SUPPLY DEVICE - In a switching power supply device, a partition portion that includes a slit divides a winding portion of a bobbin. A primary winding of a transformer is wound to a height h1 in a first section, and a secondary winding is wound to a height h2 in a second section. A low side drive winding and a high side drive winding are wound around the primary winding to a height h3 with the high side drive winding being located toward the secondary winding. | 12-25-2014 |
20140376275 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus includes: a dead time circuit that receives an output control signal and generates dead time signal to specify a time width when both first and second switching elements are turned OFF; an output signal generation circuit that generates first and second output signals which specify the ON time of the first and second switching elements respectively in accordance with the output control signal and the dead time signal; and a dead time adjustment circuit that adjusts the turn ON timings of the first and second switching elements by changing the time width of the dead time signal in accordance with the change of voltage of the DC input power or the change of the output voltage of the capacitor. | 12-25-2014 |
20140376276 | SWITCHING POWER SUPPLY DEVICE - Included are a switching power supply device main body, and a frequency control circuit that controls the switching frequency of a switching element in accordance with a feedback signal in accordance with the output voltage of the switching power supply device main body. The frequency control circuit is divided into a frequency control region wherein the amount of the feedback signal is greater than a predetermined boundary value and a frequency control region wherein the amount is less, linear frequency control whereby the switching frequency of the switching element is caused to change linearly in accordance with the feedback signal is executed in the frequency control region wherein the feedback amount is less, and linear cycle control whereby the switching cycle of the switching element is caused to change linearly in accordance with the feedback signal is executed in the frequency control region wherein the feedback amount is greater. | 12-25-2014 |
20150009716 | POWER CONVERSION DEVICE AND METHOD FOR DRIVING SAME - An electric power conversion device includes a primary circuit having a resonance inductor, a switch unit, and a primary winding of a transformer. A secondary circuit supplies an electric power to primary winding of transformer to supply an energy generated on secondary winding to a load. Switch unit includes first and second diodes connected in parallel to each other, first and second switching elements and a resonance capacitor. Furthermore, secondary circuit includes an output inductor between secondary windings and load. This structure achieves reductions of a loss, a size, and a cost and makes possible to suppress a destruction possibility of semiconductor elements and a worsening of a power factor. | 01-08-2015 |
20150009717 | SWITCHING POWER SUPPLY - A switching power supply of certain aspects of the invention includes a minimum dead time generating circuit that generates a minimum dead time from an OFF timing of an ON pulse detected from the voltage across an auxiliary winding of the transformer by a differentiating circuit. An ON width-determining means of a voltage control oscillator is started, after this minimum dead time, into operation to determine the ON width of the semiconductor switch. | 01-08-2015 |
20150016152 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS - The power supply apparatus includes a transformer; a switching unit that causes two switching elements connected in series to drive the primary winding of the transformer; a detection unit that detects current flowing on the primary side of the transformer; a correction unit that corrects a detection result of the detection unit according to an input voltage input into the transformer; and a nonlinear correction unit that corrects the detection result such that correction by the correction unit is nonlinear to the input voltage. | 01-15-2015 |
20150023066 | CONTROL DEVICE OF A SWITCHING POWER SUPPLY - A control section for a current resonant converter section controls a DC output voltage of a current resonant converter section to settle to a target voltage by varying a resonant period between predetermined two resonant periods based on an error signal between the DC output voltage and the target voltage. A gain converter is provided in a preceding stage of a frequency generator for generating a square waveform signal with a duty ratio of 50% and the gain converter has a setting of a nonlinear gain characteristic that cancels nonlinearity in the input-output characteristics of the current resonant converter section. The nonlinear gain characteristic can be a characteristic of continuous gain conversion or discrete gain conversion. | 01-22-2015 |
20150043248 | POWER SUPPLYING DEVICE - A power supplying device is electrically connected to an alternating current (AC) power supplier and an electronic system. The power supplying device includes a rectifier, a power converter, a controller, a power manager, and a switch component. The power converter is electrically connected to the rectifier and includes a first electric power outputting terminal and a standby electric power outputting terminal. The standby electric power outputting terminal is electrically connected to the electronic system. The controller is electrically connected to the power converter. The power manager is electrically connected to the controller and the electronic system. The switch component is electrically connected to the first electric power outputting terminal, the power manager, and the electronic system. The switch component conducts or cuts-off an electric power outputted form the first electric power outputting terminal and transmitting to the electronic system according to controls of the power manager. | 02-12-2015 |
20150049519 | Single Switch Infinite-Level Power Inverters - An electrical power converter includes a circuit with a single switching transistor that is electrically connected to a direct current power source, a first inductor-capacitor (LC) circuit electrically connected to the single switching transistor, a second LC circuit electrically connected to the first LC circuit and configured to provide an output signal to a load. A controller is operatively connected to the single switching transistor. The controller identifies an error between the output signal of the circuit and a reference signal and adjusts a duty cycle of a pulse width modulation (PWM) switching signal to switch the single switching transistor at a predetermined frequency with the adjusted duty cycle to reduce the identified error. | 02-19-2015 |
20150049520 | RESONANT CONVERTER AND CONTROLLING METHOD THEREOF - A resonant converter and its controlling method are provided. The resonant converter includes a bridge switching circuit receiving a DC input voltage through its power terminal, a resonant and transforming circuit, a rectifying and filtering circuit, and an over-current protecting circuit. The resonant and transforming circuit has at least one resonant capacitor charged/discharged in response to the switching of the bridge switching circuit. The rectifying and filtering circuit rectifies and filters outputs of the resonant and transforming circuit, and generates a driving voltage accordingly. The over-current protecting circuit is coupled to the power terminal and crosses over the resonant capacitor to form a clamp path. The over-current protecting circuit detects a current flowing through the resonant and transforming circuit or a load and determines whether to conduct/cut off the clamp path according to the detection result to limit a cross voltage of the resonant capacitor within a first voltage range. | 02-19-2015 |
20150049521 | CONTROL DEVICE FOR A RECTIFIER OF A SWITCHING CONVERTER - A control device for a rectifier of a switching converter that includes a rectifier with at least one MOS transistor and a control device that is configured to generate a turn on and off signal for the at least one transistor. The control device also includes a measuring circuit to measure the conduction time of the body diode of the at least one transistor during each converter switching half-cycle. The control device is configured to, cycle by cycle: verify if the drain-source voltage of the at least one transistor is greater or less than a voltage threshold, and if the drain-source voltage is greater than the voltage threshold to turn off the at least one transistor, measure the conduction time of the body diode and increase the voltage threshold by a quantity in the next switching cycle. | 02-19-2015 |
20150055376 | OPEN LOOP POWER CONVERSION APPARATUS - An open loop power conversion apparatus is applied to a load apparatus and an input power. The open loop power conversion apparatus outputs a predetermined voltage to the load apparatus. The open loop power conversion apparatus includes a resonant inductor, a magnetic inductor, a resonant capacitor, and a transformer. The resonant inductor has a non-uniform air gap. An inductance of the resonant inductor is decreasing when a current outputted from the open loop power conversion apparatus to the load apparatus is increasing. An output voltage gain of the open loop power conversion apparatus is increasing, so that the predetermined voltage is increasing. | 02-26-2015 |
20150062973 | DC-DC CONVERTER DEVICE - A DC-DC converter device and method for controlling the DC-DC converter device includes controlling gate drivers connected to the respective gate of first and second resonant circuit switches of a resonant circuit, controlling gate drivers connected to the respective gate of first and second rectifier switches of a synchronous rectifier, and detecting whether a shutdown criteria is fulfilled or not. If the shutdown criteria is fulfilled, the method is further includes the step of sending a shutdown signal to a shutdown device. | 03-05-2015 |
20150085535 | LLC single stage power factor correction converter - A single stage PFC LLC power converter is consist of two transformer, one forward transformer, one main transformer. The first winding of the forward transformer is connected with a capacitor in series then paralleled with another capacitor and this circuit is connected with the primary winding of the main transformer in series as primary load circuit in LLC power converter, the energy through the main transformer is transferred to the secondary circuit and the energy through the first winding of the forward transformer is transferred to the second winding of the forward transformer to correct the input current waveform. | 03-26-2015 |
20150092453 | CURRENT RESONANCE TYPE POWER SUPPLY DEVICE - The present invention includes: a series circuit formed of a reactor Lr, a primary winding P of a transformer T, and a capacitor C | 04-02-2015 |
20150098254 | CONTROLLER FOR USE WITH A POWER CONVERTER AND METHOD OF OPERATING THE SAME - A controller for use with a power converter and method of operating the same. In one embodiment, the controller includes a gate drive terminal configured to provide a gate drive signal to enable conductivity of a power switch during a first portion of a switching interval and to disable conductivity of the power switch during a second portion of the switching interval. The controller also includes a current sense terminal configured to receive a power switch signal indicative of a current in the power switch during the first portion of the switching interval, and receive a control signal to operate the power converter or provide a status signal indicative of an operating condition of the power converter during the second portion of the switching interval. | 04-09-2015 |
20150103564 | PARALLEL RESONANT CONVERTER AND CONTROL METHOD THEREOF - A parallel resonant converter including a control circuit and at least two resonant conversion circuits connected in parallel between an input bus and an output bus is provided by the invention. The control circuit is configured to provide a switching frequency signal to the at least two resonant conversion circuits. Moreover, the control circuit is further configured to control the voltage of the output bus to linearly vary along with the switching frequency signal in a rated range by using a linear current-balancing curve (gain-frequency), and thus achieving the purpose of current-balancing for the at least two resonant conversion circuits. The invention is capable of controlling the output voltage of the parallel resonant converter, so as to reduce the ripple on the output voltage of the power supply system. | 04-16-2015 |
20150124492 | Apparatus and Method for High Efficiency LLC Resonant Converters - A method comprises providing a resonant converter, wherein the resonant converter comprises an input switch network coupled to a power source, wherein the input switch network comprises a plurality of power switches, a resonant tank coupled to the plurality of power switches, a transformer coupled to the resonant tank and an output stage coupled to the transformer, wherein the output stage comprises a synchronous rectifier formed by a first switch and a second switch, detecting a drain voltage of the first switch, comparing the drain voltage with a predetermined voltage threshold, wherein the drain voltage is coupled to a negative input of a comparator and the predetermined voltage threshold is coupled to a positive input of the comparator, generating a logic state based upon an output of the comparator and adjusting, by a control circuit, a switching frequency of the resonant converter based upon the logic state. | 05-07-2015 |
20150131336 | DUAL-EDGE TRACKING SYNCHRONOUS RECTIFIER CONTROL TECHNIQUES FOR A RESONANT CONVERTER - This disclosure provides control techniques for a resonant converter. In one control technique, for switching speeds that are below the resonant frequency of the primary stage of the converter, the switches of the synchronous rectifier (SR) portion (SR switches) of the resonant converter are controlled based on a rising edge of the corresponding primary side switch and the turn off time of a corresponding SR switch. In general, for below resonance operation, each corresponding SR switch will be turned off prior to the falling edge of each corresponding primary side switch, while each corresponding SR switch will be turned on at the rising edge of the each corresponding primary side switch. The conduction time of respective SR switches is generally constant for below resonance operation. In another control technique, for switching speeds that are above the resonant frequency of the primary stage of the converter, the SR switches are controlled based on the falling and rising edges of the voltage across the each corresponding SR switch. In general, for above resonance operation, each corresponding SR switch will be turned off after the falling edge of each corresponding primary side switch, while each corresponding SR switch will be turned on after the rising edge of the each corresponding primary side switch. | 05-14-2015 |
20150303792 | INTEGRATED-TYPE TRANSFORMER - An integrated-type transformer according to an embodiment includes a linear-type magnetic member; a power factor correction circuit disposed to a left of the linear-type magnetic member and including an inductor; and a transformer disposed to a right of the linear-type magnetic member and including a primary coil and a secondary coil. | 10-22-2015 |
20150303813 | AC-TO-DC POWER CONVERTING DEVICE - A power converting device includes a filter filtering an AC input voltage to generate a filtered voltage, a power factor corrector boosting the filtered voltage to generate a boosted voltage, and a step-down converter reducing the boosted voltage to generate a DC output voltage. The power factor corrector includes a capacitor, an inductor, two diodes and two switches. The inductor has a first terminal coupled to the filter, and a second terminal. The diodes are coupled in series across the capacitor. A common node between the diodes is coupled to the second terminal of the inductor. The switches are coupled in series across the capacitor. A voltage across one of the switches serves as the boosted voltage. | 10-22-2015 |
20150311807 | POWER SUPPLY AND METHOD FOR CONTROLLING A POWER SUPPLY - A power supply having a transformer, a magnetizing current regulation circuit, and a device for controlling the regulation circuit intended to switch the regulation circuit alternately from the magnetizing state to the demagnetizing state is disclosed. The control device is intended to prolong the magnetization phase for a magnetization time (T | 10-29-2015 |
20150318778 | INRUSH CURRENT CONTROL DURING STARTING OF RESONANT CONVERTERS - A converter with soft start includes a transformer; first and second switches connected to the transformer to supply power to the transformer; a controller connected to the first and second transistors and arranged to, during startup of the converter, switch the first switch with a variable duty cycle and switch the second switch with either a fixed duty cycle or a variable duty cycle with pulses larger than pulses of the variable duty cycle of the first switch; and a bleed device arranged to set initial conditions of the converter before startup of the converter by discharging a capacitor in the converter before startup. | 11-05-2015 |
20150326103 | SWITCH CONTROL CIRCUIT AND POWER SUPPLY DEVICE INCLUDING THE SAME - A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. The first dead time information is information about a dead time of a first switch and a second switch controlling power supply, the second dead time information is information about a dead time for synchronous rectification, and the protection mode includes an auto-restart mode and a latch mode. | 11-12-2015 |
20150326133 | MULTI-MODE ACTIVE CLAMPING POWER CONVERTER - A multi-mode active clamping power converter comprises an input inductor, a down-bridge switch, an up-bridge switch, a first energy-storing capacitor, a clamping capacitor, a resonant inductor, a magnetizing inductor, a transformer, an output diode and an output capacitor. The input inductor has a boundary inductance value, wherein an input voltage source is operated between a first voltage and a second voltage and the boundary inductance value is set according to the first voltage and a heavy load so as to be served as an initial condition of the multi-mode active clamping power converter, and then the input inductor is operated in a boundary conduction mode. | 11-12-2015 |
20150349627 | LLC RESONANT POWER CONVERTER - A LLC resonant power converter for converting an input voltage from a direct current power source into an output voltage includes a first power switch, a second power switch, a transformer, a rectifying filter circuit, a LLC resonant circuit including a resonant inductor, a magnetizing inductor, and a variable capacitor that are electrically connected in series, a controller that controls the first power switch and the second power switch to be alternately switched to an on-state and that controls the variable capacitor to have a first capacitance value or a second capacitance value when the controller determines that the input voltage is within a first voltage range or a second voltage range, respectively. | 12-03-2015 |
20150357921 | INTERLEAVED LLC CURRENT EQUALIZING CONVERTER - The present invention discloses an interleaved LLC convertor with current sharing. The interleaved LLC convertor with current sharing comprises: an interleaved LLC circuit, consisting of an even number of LLC circuits connected in parallel; and a plurality of windings with the same quantity as that of the LLC circuits, wherein all first polarization terminals from each of LLC circuits at its DC output side together constitute a first output terminal; all first terminals from each of the windings together constitute a second output terminal; a first half of the plurality of windings surround a magnetic core in a first direction, and a second half of the plurality of windings surround the magnetic core in a second direction; each of the plurality of windings has the same inductance, and the first half of the plurality of windings are inversely coupled with the second half of the plurality of windings; and the second polarization terminal of each LLC circuit at its DC output side connects to a second terminal of one of the windings. | 12-10-2015 |
20150357922 | DIRECT CURRENT VOLTAGE CONVERSION DEVICE - A direct current voltage conversion device includes a buck converter receiving a direct current input voltage and outputting a direct current first voltage according to a first control signal, a series resonant converter outputting an alternating current second voltage according to a second control signal and a third control signal, a transformer that receives the alternating current second voltage, a rectifier, and an output capacitor electrically coupled with the rectifier. The rectifier generates a direct current output voltage according to a fourth control signal and a fifth control signal, which is outputted across the output capacitor. | 12-10-2015 |
20150357927 | Multi-Mode Operation and Control of a Resonant Converter - In accordance with an embodiment, a method of controlling a switched-mode power includes generating a feedback signal proportional to an output of the switched-mode power supply, and operating the switched-mode power supply in a normal mode. If the feedback signal crosses a first threshold, the switched-mode power operates in a second operating mode. In the first operating mode the pulse modulated signal is adjusted to regulate a feedback signal to a first signal level, and in the second operating mode, a dead-time of the pulse modulated signal is adjusted to signal to regulate a feedback signal to a second signal level different from the first signal level. The method further includes driving a switch of the switched-mode power supply with the pulse modulated signal. | 12-10-2015 |
20150365006 | CONDUCTION DETECTING CIRCUIT, RECTIFYING SWITCH CONTROLLING CIRCUIT INCLUDING THE CONDUCTION DETECTING CIRCUIT AND POWER SUPPLY FOR THE RECTIFYING SWITCH CONTROLLING CIRCUIT TO BE APPLIED - A circuit configured to detect the conduction of a first body diode and a second body diode of the first and second synchronous rectification transistors is provided. The circuit includes a low-pass filter configured to generate a filtered voltage by receiving a detection voltage based on a drain voltage of the first synchronous rectification transistor and low-pass filtering the received drain voltage, a first comparator configured to compare whether the filtered voltage is higher than the detection voltage, and a second comparator configured to compare whether the detection voltage is higher than the filtered voltage. A time point of ending a first synchronous rectification conduction interval of the first body diode and a time point of a second synchronous rectification conduction interval of the second body diode are determined, according to outputs from the first and second comparators. | 12-17-2015 |
20150372607 | PARALLEL RESONANT CONVERTER CIRCUIT WITH CURRENT-EQUALIZATION FUNCTION - A parallel resonant converter circuit with current-equalization function includes a power input terminal, a power output terminal, an output capacitor, first and second resonant converters and a third transformer. The first resonant converter is electrically coupled between the power input terminal and the output capacitor/power output terminal. The first resonant converter includes a first transformer. The second resonant converter is electrically coupled between the power input terminal and the output capacitor. The first resonant converter and the second resonant converter are coupled in parallel. The second resonant converter includes a second transformer. The third transformer includes a first coil winding set and a second coil winding set. The first coil winding set is electrically coupled between the power input terminal and the first transformer in series. The second coil winding set is electrically coupled between the power input terminal and the second transformer in series. | 12-24-2015 |
20150381055 | Switching Power-Supply Device - A switching power-supply device which includes a control unit configured to perform a switching control; and a resonance current detection unit configured to detect the resonance current flowing through the series resonance circuit. | 12-31-2015 |
20150381059 | ACTIVATION CIRCUIT OF A RESONANCE CONVERTER - An activation circuit for activating a power bridge circuit of a resonance converter, including an inductive activation transformer that transfers a pulsed control signal generated via a CMOS driver to the power bridge circuit, wherein a clamping circuit is arranged at the output of each CMOS driver, where the clamping circuit clamps a primary winding of the activation transformer to a ground potential during the dead time between two pulses of the pulsed control signal such that overvoltages, which otherwise arise when switching the activation transformer inductance, are thus clamped during a dead time and a circuit breaker switches off securely. | 12-31-2015 |
20150381061 | CURRENT SAMPLING METHOD AND CURRENT SAMPLING APPARATUS FOR ISOLATED POWER CONVERTER - Disclosed are a current sampling apparatus and a current sampling method for an isolated power converter. The isolated power converter includes a square wave generator, an isolated transformer, and a primary side filter circuit coupled therebetween. The current sampling apparatus includes: a first sampling circuit coupled to the primary side of the isolated transformer and sampling a total current of the primary side of the isolated transformer and outputting a first sampling current; and a shunt circuit receiving the first sampling current. The shunt circuit includes a first shunt branch circuit through which the first sampling current is transformed into an excitation sampling current and a second shunt branch circuit through which the first sampling current is transformed into a current to be sampled. | 12-31-2015 |
20160006356 | WIRELESS POWER TRANSFER SYSTEMS USING LOAD FEEDBACK - A system includes an AC input port configured to be coupled to an AC power source, a first AC/DC converter circuit having a first port coupled to the AC input port, and a first resonant circuit coupled to the first port of the first AC/DC converter circuit. The system further includes a second resonant circuit inductively coupled to the first resonant circuit, a second AC/DC converter circuit coupled to the second resonant circuit and a control circuit configured to control the first AC/DC converter circuit responsive to an output of the second AC/DC converter circuit. | 01-07-2016 |
20160013714 | A METHOD OF CONTROL FOR SYNCHRONOUS RECTIFIERS | 01-14-2016 |
20160013722 | DEVICE FOR AVOIDING HARD SWITCHING IN RESONANT CONVERTER AND RELATED METHOD | 01-14-2016 |
20160013724 | Multiphase DC/DC Converters And Control Circuits For Controlling Converters Using Fixed And/Or Variable Frequencies | 01-14-2016 |
20160065075 | CURRENT RESONANT POWER SUPPLY DEVICE - First and second switch are connected in series to both terminals of a DC power source. A series circuit comprising a reactor, a primary winding of a transformer, and a capacitor connected in series, and is connected to a node between the first and second switches and one terminal of the DC power source. A rectifier smoothing circuit rectifies and smoothens a voltage generated across a secondary winding of the transformer and outputs a DC voltage. A control circuit alternately turns the first and second switches on and off. A voltage detection circuit detects the DC voltage from the rectifier smoothing circuit. A signal generation circuit generates a feedback signal from the DC voltage detected by the voltage detection circuit, and outputs the signal for turning the first and second switches on and off. A load current detection circuit detects load current contained in resonance current flowing through the capacitor. | 03-03-2016 |
20160072392 | Power Supplies - Circuits and techniques for improving power converter efficiencies and controllability are disclosed. For example, a first converter stage includes a push-pull circuit topology and an isolating element including a magnetizing inductance for isolating a primary side of the first converter stage from a secondary side of the first converter stage. The magnetizing inductance may vary as a function of a current flowing in the primary side of the first converter stage. For example, the isolating element can be a transformer with a stepped gap core and have a varying magnetizing inductance profile. | 03-10-2016 |
20160079862 | LLC Resonant Converter Apparatus And Method - An output voltage of an LLC resonant converter circuit is received. The received output voltage is analyzed to determine whether the received output voltage is within an acceptable operational range. When the output voltage is not within the acceptable operational range and the operational frequency is below a maximum predetermined frequency, the operational frequency of the LLC resonant converter circuit is adjusted. The adjustment of the operational frequency is effective to change the output voltage to a value that is within the acceptable operational range. When the output voltage is not within the acceptable operational range and the operational frequency is above the maximum predetermined frequency, a phase shift in the LLC resonant converter circuit is adjusted. This adjustment is effective to change the output voltage to a value that is within the acceptable operational range. | 03-17-2016 |
20160087544 | SWITCHING MODE POWER SUPPLY AND THE CONTROLLER AND THE METHOD THEREOF - A switching mode power supply with resonant technology. The switching mode power supply current uses current polarity evaluation to avoid capacitive mode by triggering the capacitive protection if the evaluation indicates that the system will enter capacitive mode. | 03-24-2016 |
20160094135 | Serial Hybrid Converter Apparatus and Method - An apparatus comprises an isolated power converter coupled to an input dc power source, wherein the isolated power converter comprises a primary switching network operating at a fixed switching frequency, a secondary resonant tank including a dc blocking capacitor and a rectifier having two input terminals coupled to the secondary resonant tank, an output capacitor coupled between a first output terminal of the rectifier and a load and a dc/dc converter coupled between a second output terminal of the rectifier and the load. | 03-31-2016 |
20160094136 | Resonant Converter Apparatus and Method - A converter comprises a non-isolated stage coupled to an input dc power source, wherein the non-isolated stage is configured to operate at a buck converter mode in response to a first input voltage and operate at a boost converter mode in response to a second input voltage, a resonant stage coupled between the non-isolated stage and a load, wherein the resonant stage is configured to operate at a resonant mode and a capacitor coupled between the non-isolated stage and the resonant stage. | 03-31-2016 |
20160111964 | SWITCH DRIVING CIRCUIT AND SWITCHING POWER DEVICE USING THE SAME - A switch driving circuit is provided, wherein the switch driving circuit has a function of periodically updating a simultaneous OFF time prepared to soft-switch an upper switch and a lower switch of a switching output circuit, and is configured to monitor how an output power or an input power of the switching output circuit is changed depending on previous updating of the simultaneous OFF time to determine new updated contents. | 04-21-2016 |
20160126847 | CURRENT SENSORLESS MPPT FOR PV MICRO-INVERTERS - Systems, methods, and devices for use with photovoltaic micro-inverters. A control system for controlling power switches in a full bridge inverter in a DC/DC converter uses an estimate of the output current of a photovoltaic (PV) panel. The estimate is provided by a current estimator that takes as input the output voltage of the PV panel as well as the bus voltage of the DC/DC converter. Also used as input to the current estimator are two of the control signals for specific power switches in the full bridge inverter in the DC/DC converter. | 05-05-2016 |
20160141951 | System and Method for a Startup Cell Circuit - According to an embodiment, a circuit comprising includes a first switching circuit coupled to a power supply input, a second switching circuit coupled to an output of the first switching circuit, a supply capacitor coupled to the second switching circuit, and a startup cell coupled to the power supply input and the supply capacitor. The startup cell is configured to electrically couple the power supply input to the supply capacitor when the second switching circuit is not actively switching. The startup cell is also configured to electrically decouple the power supply input from the supply capacitor when the second switching circuit is actively switching. | 05-19-2016 |
20160141964 | System and Method for a Switched-Mode Power Supply - In accordance with an embodiment, a method of operating a power supply includes detecting a loss of at least one of an AC input voltage an AC input power at an input of the power supply, and increasing a switching frequency of the power supply upon detection of the loss of the AC input voltage or AC input power. | 05-19-2016 |
20160149501 | Parallel Hybrid Converter Apparatus and Method - An apparatus comprises an isolated power converter coupled between an input dc power source, wherein the isolated power converter comprises a first switch network coupled to a first transformer winding through a first resonant tank and a second switch network coupled to a second transformer winding through a second resonant tank and a dc/dc converter coupled to the second switch network. | 05-26-2016 |
20160156270 | Control Arrangement | 06-02-2016 |
20160164423 | Quasi-Resonant Magnetron Power Supply - A power supply comprises at least one input to couple the power supply to a power source. The power supply also comprises at least one switched-mode power circuit configured to extract electrical energy from the power source, the electrical energy to be transferred to a load. The power supply additionally comprises at least one control module coupled between the at least one input and the at least one switched-mode power circuit. The control module is configured to control operation of the switched-mode power circuit to regulate a voltage-to-current ratio at the at least one input of the power supply. | 06-09-2016 |
20160172841 | PROTECTION MODE CONTROL CIRCUIT, SWITCH CONTROL CIRCUIT INCLUDING THE PROTECTION MODE CONTROL CIRCUIT AND POWER SUPPLY DEVICE INCLUDING THE SWITCH CONTROL CIRCUIT | 06-16-2016 |
20160172843 | SHORT-CIRCUIT PROTECTION METHOD AND DEVICE FOR A HALF-BRIDGE RESONANT CONVERTER | 06-16-2016 |
20160172958 | MODULATION MODE CONTROL CIRCUIT, SWITCH CONTROL CIRCUIT INCLUDING THE MODULATION MODE CONTROL CIRCUIT AND POWER SUPPLY DEVICE INCLUDING THE SWITCH CONTROL CIRCUIT | 06-16-2016 |
20160181927 | System and Method for a Switched-Mode Power Supply | 06-23-2016 |
20160190946 | Resonant Converters with Synchronous Rectifier Feedback - A method comprises detecting a signal representing a drain-to-source voltage of a switch of a synchronous rectifier of an inductor-inductor-capacitor (LLC) resonant converter, comparing the signal with a predetermined threshold, generating a first logic state if the drain-to-source voltage is greater than the predetermined threshold, generating a second logic state if the drain-to-source voltage is less than the predetermined threshold and in response to the first logic state and the second logic state, adjusting a switching frequency of the LLC resonant converter such that the switching frequency moves back and forth across a boundary of body diode conduction, wherein a frequency difference between the switching frequency and a resonant frequency of the LLC resonant converter is less than or equal to one frequency adjustment step. | 06-30-2016 |
20160254755 | MAGNETIZING CURRENT BASED CONTROL OF RESONANT CONVERTERS | 09-01-2016 |
20160254756 | MAGNETIC INTEGRATED DEVICE AND POWER CONVERSION CIRCUIT | 09-01-2016 |
20160380544 | Power Converters And Methods For Reducing Voltage Changes At An Output Of A Power Converter - Example switching power converters and methods for reducing voltage changes at an output of a power converter are generally disclosed. According to one aspect, a switching power converter includes an input, an output for providing an output voltage, at least one switch capable of causing a voltage overshoot of the output voltage when the switch is turned on, and a controller. The controller is configured to sense the output voltage, compare the sensed output voltage to a voltage reference, and adjust operation of the power converter based on the comparison of the sensed output voltage and the voltage reference to maintain the output voltage. The controller is further configured to decrease the voltage reference from a normal operation value to an overshoot reduction value before turning on the switch to decrease the output voltage and reduce an overshoot of the output voltage in response to turning on the switch. | 12-29-2016 |
20160380548 | RESONANT CONVERTER - A resonant converter includes: a transformer including a first primary winding, a second primary winding and a secondary winding, each primary winding having a first end terminal and a second end terminal; a first switch coupled to the first end terminal of the first primary winding; a resonant inductor and a resonant capacitor connected in series between the second end terminal of the first primary winding and the first end terminal of the second primary winding; a second switch coupled between the first end terminals of the first and second primary windings; and a third switch coupled between the second end terminals of the first and second primary windings. | 12-29-2016 |
20170237356 | SWITCHING POWER SUPPLY APPARATUS | 08-17-2017 |
20190149058 | SWITCHED MODE POWER SUPPLY CONTROLLER | 05-16-2019 |