Entries |
Document | Title | Date |
20080212341 | DC-DC CONVERTER AND TRANSFORMER - A DC-DC converter using a plurality of transformers capable of decreasing the loss, preventing heat generation of transformers, and improving the heat transfer property of the core, and an integrated type transformer used in this DC-DC converter. A terminal T | 09-04-2008 |
20080239764 | Forward power converter controllers - This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). | 10-02-2008 |
20080310191 | METHOD AND SYSTEM FOR PULSE FREQUENCY MODULATED SWITCHING MODE POWER SUPPLIES - A pulse frequency modulation (PFM) controller for controlling a switching mode power supply. The controller includes an output terminal for providing a control signal to turn on and off a current in the power supply to regulate an output of the power supply. A first input terminal receives a feedback signal related to the output of the power supply, the feedback signal exhibiting a ringing waveform when the current in the power supply is turned off. The controller also includes a control circuit configured to provide the control signal in response to the feedback signal. The control signal is adapted to turn on the current in the power supply when the feedback signal is substantially at a valley of the ringing waveform of the feedback signal. In an embodiment, such a PFM controller can reduce turn-on transition loss in a power supply and provides frequency dithering to reduce electromagnetic interference. | 12-18-2008 |
20090122579 | MIXED FLYBACK-FORWARD TOPOLOGY CONVERTER WITH REDUCED RIPPLE CURRENT - A mixed flyback-forward topology converter includes a transformer having a core, a primary winding, a first secondary winding and a second secondary winding. A switch connects power to the primary winding. A forward stage is connected to the first secondary winding. A flyback stage is connected to the second secondary winding. An output voltage is provided by the flyback stage when the switch is in an off state and by the forward stage when the switch is in an on state. | 05-14-2009 |
20090135628 | METHOD AND APPARATUS OF CAPACITOR DIVIDER BASED OFFLINE AC-DC CONVERTER - An AC/DC power converter has, as its first stage, a capacitor divider and rectifier and, as the second stage, a switch mode power supply. This configuration may be suitable for low power low voltage aerospace applications. The benefits of the circuit may include small reactive component size; near sinusoidal input current, low EMI emissions resulting from low inrush current; intrinsic current limiting that may eliminate the need for short circuit protection; and low overall component count. | 05-28-2009 |
20090168463 | DC TO DC CONVERTER - An exemplary DC to DC converter includes a first transistor, a second transistor, a transformer, and a pulse generating circuit having a first capacitor, a sampling resistor, a zener diode, and a first diode. A DC voltage input terminal is configured for receiving a first DC voltage and is grounded via the primary winding of the transformer, a collector electrode and an emitter electrode of the first transistor in series. A terminal of the auxiliary winding of the transformer is grounded via the inverted first diode, the non-inverted zener diode, the sampling resistor, and the first capacitor. The other terminal of the auxiliary winding is grounded. A first transistor having a base electrode connected to the DC voltage input terminal. A second transistor includes an emitter electrode a cathode of the zener diode, a collector electrode connected to a base electrode of the first transistor, and a grounded base electrode. | 07-02-2009 |
20090251930 | METHOD AND APPARATUS FOR REGULATING AN OUTPUT CURRENT FROM A POWER CONVERTER - Techniques are disclosed to regulate an output current through a load coupled to a power converter using a current source coupled to the load. For instance, one power converter according to the teachings of the present invention includes an energy transfer element coupled between an input of the power converter and an output of the power converter. A power converter controller is coupled to the energy transfer element to control a transfer of energy from the input of the power converter to the output of the power converter. A load is to be coupled to the output of the power converter. A current source is to be coupled to the load. The current source regulates the current flowing through the load to a threshold current value. The current source is coupled to sense a current through the load. A switch having a first and second end is also included. The first end is to be coupled to the load and the second end is coupled to the current source. The switch is coupled to be switched on and off at a duty cycle to control an average current through the load. The current through the load is substantially equal to a current through the switch and the current source. | 10-08-2009 |
20090262559 | SEMICONDUCTOR DEVICE, AND ENERGY TRANSMISSION DEVICE USING THE SAME - A semiconductor device includes: a high breakdown voltage semiconductor element including a switching element and a JFET element; and a sense element. The sense element includes a first drift region of a first conductivity type, a first base region of a second conductivity type, a first source region of a first conductivity type, a first gate insulating film, a first drain region of a first conductivity type, a sense electrode electrically connected to the first source region, a first gate electrode, and a first drain electrode electrically connected to the first drain region. The first gate electrode of the sense element and the second gate electrode of the switching element are connected to each other. The first drain electrode of the sense element and the electrode shared by the switching element and the JFET element are connected to each other. | 10-22-2009 |
20090290390 | SWITCHED MODE POWER SUPPLY SYSTEMS - We describe a switch mode power supply (SMPS) current regulation system comprising: a current sense signal input sensing a primary current of the SMPS; a voltage sense input to receive a voltage sense signal from a primary or auxiliary winding; a switch drive signal input to receive a drive signal; a timing signal generator coupled to said voltage sense input and to said drive signal input to generate a timing signal T | 11-26-2009 |
20090296425 | POWER SUPPLY CONTROLLER AND METHOD THEREFOR - In one embodiment, a switching controller uses an auxiliary winding voltage of a transformer to form a signal representative of current flow through a secondary winding of the transformer. The controller id configured to limit a current through a secondary winding to a maximum value. | 12-03-2009 |
20090316440 | DC-DC CONVERTER - Provided is a DC-DC converter that can reduce losses. Ein and C | 12-24-2009 |
20100061124 | System and Method for Power Conversion - A system and method for operating power supplies. A method comprises altering a current sense (CS) signal, turning off a switch of the converter in response to a determining that the CS signal is greater than or equal to a first threshold, and leaving on the switch of the converter in response to a determining that the CS signal is less than the first threshold. | 03-11-2010 |
20100165669 | SINGLE-STAGE ISOLATED HIGH POWER FACTOR AC/DC CONVERTER WITH LEAKAGE INDUCTOR ENERGY RECOVERY FUNCTION - A single-stage isolated high power factor AC/DC converter with a leakage inductor energy recovery function includes a buck-boost circuit, for step-down or step-down a power supply; a transformer, electrically connected to the buck-boost circuit, for transforming the stepped-down or stepped-up power supply; a switch, electrically connected to the buck-boost circuit; an input capacitor, electrically connected to the buck-boost circuit; and an output circuit, for outputting the power supply transformed by the transformer. When the switch is cut off, the buck-boost circuit provides an energy recovery path to return energy stored in a leakage inductor of the transformer to the input capacitor. The energy stored in the leakage inductor of the transformer in a flyback converter or a forward converter is returned to the input capacitor through the energy recovery path. The problem caused by the leakage inductor of the transformer is solved without using any additional element. | 07-01-2010 |
20100232184 | DC CONVERTER - A DC converter includes: a transformer (T | 09-16-2010 |
20100246215 | ISOLATED DC-DC CONVERTER - An isolated DC-DC converter includes a transformer, a main switch, an active clamp circuit and a control unit. The transformer has a primary winding. The main switch and the active clamp circuit are connected to the primary winding. The active clamp circuit has an auxiliary switch and a clamp capacitor connected in series. The control unit is provided for controlling the main switch and the auxiliary switch. The control unit performs a soft start operation of the converter before a normal operation. The control unit performs anti-saturation control before starting the soft start operation. The anti-saturation control includes an act of controlling the main switch and the auxiliary switch so that the auxiliary switch performs ON-OFF operation with the main switch kept OFF until voltage of the clamp capacitor drops below a level at which the transformer is to be magnetically saturated after starting the soft start operation. | 09-30-2010 |
20100277956 | CONTROL APPARATUS OF POWER CONVERTER CIRCUIT - To detect a peak time of an exciting current of a transformer, a primary current corresponding to the peak time, or a variation time of the primary voltage, and to switch a switch after expiration of a predetermined period from the peak time, after the peak time occurs. A control apparatus | 11-04-2010 |
20100315840 | SYSTEM AND METHOD FOR INDIRECT CONTROL OF A CONVERTER OUTPUT - One embodiment of the invention relates to a power apparatus. The power apparatus includes a power converter configured to convert an input voltage to an output voltage for providing power at an output thereof to which a load is connectable. The converter can include an isolation barrier configured to electrically isolate the output and the load from an input source that provides the input voltage. The system also includes a control loop that includes indirect sense circuitry configured to indirectly derive an indication of at least one of output current and output power of the converter. The control loop is configured to control output current or output power based on the indirectly derived indication of output current or output power, respectively. | 12-16-2010 |
20100321960 | Switching power supply unit - The switching power supply unit includes: a transformer having a primary winding and two secondary windings; and a rectifying-smoothing circuit having two rectifying elements, three choke coils and a capacitive element. A first rectifying element is between a junction of ends of the first secondary winding and the second choke coil, and one end of the capacitive element. A second rectifying element is between a junction of ends of the second secondary winding and the third choke coil, and the one end of the capacitive element. The other end of the first secondary winding and the other end of second secondary winding are connected to the one end of the first choke coil. The other end of the first choke coil, the other end of the second choke coil, and the other end of the third choke coil are connected to the other end of the capacitive element. | 12-23-2010 |
20100328970 | SINGLE-STAGE HIGH-VOLTAGE POWER SUPPLY WITH HIGH EFFICIENCY AND LOW NETWORK DISTORTION - The invention includes a high-voltage power supply connected, by a network input, to an AC network of frequency Fr, with n phases, and providing a high DC output voltage at at least one HV output. The power supply includes a single-phase high-voltage conversion module per phase of the network having a current rectification circuit connected, by a single-phase input of the conversion module, to a respective phase of the network and, by a rectified-current output, to a switching circuit having at least one switching transistor for switching the rectified current at a frequency Fd and p secondary HV circuits, each providing a secondary, p being an integer greater than or equal to 1, j being the rank of the secondary HV circuit ranging between 1 and p. A control and regulation unit for the power supply comprises a control circuit per conversion module. | 12-30-2010 |
20110026276 | SWITCHING POWER SUPPLY - A switching power supply includes: a transformer including primary and secondary windings; a switching circuit including first and second switching elements, first and second rectifying elements, first and second capacitive elements and a first inductor; and a rectifying/smoothing circuit. A first bridge circuit is configured by the first and second switching elements located in a diagonal arrangement and the first and second capacitive elements also located in a diagonal arrangement. The first and second rectifying elements are connected in parallel to the first and second switching elements, respectively. One of the first and second rectifying elements is in forward direction and other is in inverse direction. The first inductor is disposed on a connection line between the pair of input terminals and the first bridge circuit. The primary winding is connected to the first bridge circuit to form a H-bridge configuration. The secondary winding is disposed in the rectifying/smoothing circuit. | 02-03-2011 |
20110051469 | POWER SUPPLY CONTROL METHOD AND STRUCTURE THEREFOR - In embodiment, a power supply system is configured to use a linear regulator to form a regulated voltage during a standby mode and to use the regulated voltage to form another regulated voltage. | 03-03-2011 |
20110058394 | Single-Ended Forward Converter - A single-ended forward converter of the present invention, has first and second switching element comprises a pair Lus N-Channel FET, a first driving circuit comprises the series-connected circuit of the first voltage drop resistor and first zener diode for driving first Lus N-Channel FET, a second driving circuit comprises the series-connected circuit of the second voltage drop resistor and second zener diode for driving second Lus N-Channel FET. | 03-10-2011 |
20110058395 | INVERTER CIRCUIT - This current balanced push-pull type inverter circuit includes first and second switching elements, and an output transformer which includes a first primary winding and a second primary winding connected in series between said first and second switching elements, and also includes a secondary winding for obtaining an output voltage. This inverter circuit also includes a first voltage supply capacitor, a second voltage supply capacitor, and a control unit. A first snubber circuit, in which a first free wheel diode and first and second snubber capacitors are connected in series, is connected in inverse parallel to the first switching element. A first discharge resistor is connected between the first snubber capacitor and a first power supply capacitor, and a second discharge resistor is connected between the second snubber capacitor and a third power supply capacitor. And a second snubber circuit and discharge resistors are connected to the second switching element as well, in a similar manner. | 03-10-2011 |
20110063876 | OVERVOLTAGE LIMITATION IN A SWITCH-MODE CONVERTER - A switch-mode converter including an inductive transformer having a secondary winding associated with at least one first switch, including, in parallel with the first switch, at least one first diode in series with a capacitive element; and in parallel with the capacitive element, an active circuit for limiting the voltage thereacross. | 03-17-2011 |
20110085356 | SWITCHING ELEMENT DRIVING CONTROL CIRCUIT AND SWITCHING POWER SUPPLY DEVICE - A switching element driving control circuit includes: a regulator circuit which generates a power supply voltage having an amplitude; a capacitor which smoothes the power supply voltage generated by the regulator circuit to remove a high frequency component; a circuit power supply line to which the smoothed power supply voltage is supplied; an oscillation circuit which generates a periodic signal according to an oscillation of the power supply voltage supplied from the circuit power supply line; a control circuit which generates a control signal for controlling the switching operation of the switching element, based on the periodic signal; and a driver circuit which supplies the switching element with the control signal. | 04-14-2011 |
20110141771 | ELECTRIC POWER SYSTEM INCLUDING POWER CONVERTER AND ROTARY TRANSFORMER AND METHOD OF ASSEMBLING SAME - A method of assembling an electric power system includes coupling a power converter to an electric current source. The method also includes coupling a stationary portion of a rotary transformer to the power converter. The method further includes coupling a rotatable portion of the rotary transformer to a load device. | 06-16-2011 |
20110149609 | BIDIRECTIONAL SIGNAL CONVERSION - An embodiment of a controller for a multidirectional signal converter is operable to cause the converter to regulate a first signal at a first converter node, and to have a switch timing that is independent of a direction of power transfer between the first converter node and a second converter node. For example, in an embodiment, such a controller may be part of a bidirectional voltage converter that handles power transfer between two loads. Such a voltage converter may have improved conversion efficiency and a smaller size and lower component count as compared to a conventional multidirectional voltage converter. Furthermore, such a voltage converter may be operable with a common switching scheme regardless of the direction of power transfer, and without the need for an indicator of the instantaneous direction of power flow. | 06-23-2011 |
20110149610 | BIDIRECTIONAL SIGNAL CONVERSION - An embodiment of a multidirectional signal converter includes first and second converter nodes, a transformer, and first and second stages. The transformer includes first and second windings, and the first stage is coupled between the first converter node and the first winding of the transformer. The second stage includes a first node coupled to the second converter node, a second node coupled to a node of the second winding of the transformer, and a filter node, is operable as a boost converter while current is flowing out from the second converter node, and is operable as a buck converter while current is flowing out from the first converter node. For example, in an embodiment, such a multidirectional signal converter may be a bidirectional voltage converter that handles power transfer between two loads. Such a voltage converter may have improved conversion efficiency and a smaller size and lower component count as compared to a conventional multidirectional voltage converter. Furthermore, such a voltage converter may be operable with a common switching scheme regardless of the direction of power transfer, and without the need for an indicator of the instantaneous direction of power flow. | 06-23-2011 |
20110149611 | BIDIRECTIONAL SIGNAL CONVERSION - An embodiment includes coupling a first intermediate node between a first inductor and a first winding of a transformer to a reference node during a first portion of a first switching cycle, uncoupling the first intermediate node from the reference node and coupling the first intermediate node to a signal-storage element during a second portion of the first switching cycle, coupling a second winding of the transformer between the reference node and a second converter node during the second portion of the first switching cycle, and regulating a signal at the second converter node by controlling a duration of one of the first and second portions of the first switching cycle. For example, in an embodiment, bidirectional signal converter may perform the above steps to handle power transfer between two loads. Such a voltage converter may have improved conversion efficiency and a smaller size and lower component count as compared to a conventional bidirectional voltage converter. Furthermore, such a voltage converter may be operable with a common switching scheme regardless of the direction of power transfer, and without the need for an indicator of the instantaneous direction of power flow. | 06-23-2011 |
20110157921 | MULTI-OUTPUT DC-TO-DC CONVERSION APPARATUS WITH VOLTAGE-STABILIZING FUNCTION - A multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function includes a center-tapped main transformer, a semiconductor component group, and a triggering controller. The DC-to-DC conversion apparatus provides at least two output voltages which are a main output voltage and an auxiliary output voltage, respectively. The auxiliary output voltage is functioned as an input voltage of a buck converter; and, as a result, the auxiliary output voltage can be adjusted to obtain a lower variable DC voltage. The triggering controller is used to stabilize the main output voltage and the auxiliary output voltage. Therefore, the main transformer provides one or two secondary windings to step down the auxiliary output voltage so as to increase efficiency of the buck converter. | 06-30-2011 |
20110176336 | Isolated current regulated DC-DC converter - The isolated current regulated DC-DC converter is composed of the step down switch SA, free wheel diode DA, step down inductor L, switches S | 07-21-2011 |
20110205762 | INTEGRATED-TYPE HIGH STEP-UP RATIO DC-AC CONVERSION CIRCUIT WITH AUXILIARY STEP-UP CIRCUIT - An integrated-type high step-up ratio DC-AC conversion circuit with an auxiliary step-up circuit applies to converting a low DC voltage of alternative energy into a high AC voltage. The conversion circuit uses an isolated Cuk integration unit and an auxiliary step-up unit to form a multi-phase input and uses parallel charging and cascade discharging to boost the DC voltage in the DC side with a low voltage power switches and low duty cycle and then converts the boosted DC voltage into AC voltage. The auxiliary step-up unit not only shares the entirety of power but also exempts the DC-side circuit from using high voltage power switches, whereby the cost of elements is reduced. Further, the conversion circuit can decrease the switching loss and conduction loss of the DC-side switches and promote the efficiency of the circuit. | 08-25-2011 |
20110228567 | DIGITAL-TO-ANALOG CONVERTER TO PRODUCE PAIRED CONTROL SIGNALS IN A POWER SUPPLY CONTROLLER - An controller for use in a power supply includes a variable oscillator and a digital-to-analog converter (DAC). The variable oscillator generates a switching signal having an on-time and a switching period to control a first switch to regulate an output of the power supply. The DAC provides the variable oscillator with a first analog signal and a second analog signal, where the on-time of the switching signal is responsive to the first analog signal and where the switching period is responsive to the second analog signal. The DAC includes a current source and a second switch that is configured to couple the current source to provide current to the first analog signal in response to a binary digit received by the DAC, and to couple the current source to provide current to the second analog signal in response to a complement of the binary digit. | 09-22-2011 |
20110235370 | High Efficiency Power Converter - A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings. | 09-29-2011 |
20110280048 | DC-DC CONVERTER CIRCUIT - This DC-DC converter circuit includes a switching circuit which switches a DC power supply with a primary side switching element, a transformer to a primary side winding whereof the output of the switching circuit is applied and which outputs a voltage which has been changed by a predetermined voltage change ratio to a secondary side winding, and secondary diodes for current adjustment connected to the secondary side winding of the transformer. Moreover, it includes a regeneration snubber circuit connected in parallel with the secondary diode circuit and including a series circuit of a discharge blocking diode and a snubber capacitor and a switching element for regeneration connected in parallel with the discharge blocking diode, a filter circuit connected between rectification outputs of the secondary diode circuit, and a control unit which turns the switching element for regeneration ON a predetermined time period after the timing of turning the primary side switching element OFF. The predetermined time period is set to approximately the time period during which the charge, accumulated in the snubber capacitor due to reverse recovery time when one of the secondary diodes has been turned OFF, discharges. | 11-17-2011 |
20110286246 | Electric power converter - An electric power converter facilitates performing soft switching in the two-way electric-power-conversion operation thereof, and reducing the manufacturing costs thereof and the losses caused therein, The electric power converter includes a first switching device; a second switching device; a first series circuit including capacitor, a diode, the primary winding of transformer, and a third switching device; a second series circuit including a capacitor, a fourth switching device, the primary winding of transformer, and a diode; a third series circuit including a diode and the secondary winding of transformer; and a voltage clamping element connected in parallel to the primary winding of transformer. The first series circuit is connected in parallel to the first switching device, and the second series circuit is connected in parallel to second switching device. The third series circuit is connected between the DC output terminals. | 11-24-2011 |
20120020120 | SOFT-SWITCHING CONTROL DEVICE AND METHOD OF MANUFACTURING THE SAME - Soft-switching is performed to switch a switching state to an ON state by controlling a delay time of a timing at which a main switch switches to an ON state relative to a timing at which a sub-switch switches to an ON state. Controllability of soft-switching decreases as a result of variations in time difference of a command for switching the main switch to the ON state and the actual switching of the switching state. To set a delay time suitable for performing soft-switching based on the variations in time difference, an EEPROM is provided that stores therein correction data for the delay time. The delay time of the timing of the command for switching the main switch to the ON state relative to the timing of the command for switching the sub-switch to the ON state is set based on the correction data. | 01-26-2012 |
20120020121 | CURRENT DETECTION CIRCUIT AND SWITCHING REGULATOR CIRCUIT - A current detection circuit that includes a winding part including a core provided on a switching element and a lead wire which is wound around the core, and a signal generation unit configured to generate a signal with a value having correlation to a current passing through the switching element based on a current passing through the lead wire. | 01-26-2012 |
20120033456 | ACTIVE CLAMP DC-DC CONVERTER - An active clamp DC-DC converter includes a transformer having a primary coil and a secondary coil, a main switching device connected in series to the primary coil of the transformer so that the main switching device and the primary coil are connected in parallel to a DC power source, a reset capacitor, a reset switching device connected in series to the reset capacitor so that the reset switching device and the reset capacitor are connected in parallel to the primary coil of the transformer, a rectifying circuit connected to the secondary coil of the transformer, a smoothing circuit connected to the rectifying circuit, and a control circuit adjusting a dead time that elapses from the time when the reset switching device is turned off until the time when the main switching device is turned on, based on a voltage across the main switching device. | 02-09-2012 |
20120033457 | HOLD-UP TIME EXTENDING CIRCUIT AND CONVERTER INCLUDING THE SAME - The present invention relates to a hold-up time expansion circuit and a converter including the same. | 02-09-2012 |
20120039094 | INTERLEAVED TYPE POWER FACTOR CORRECTION CIRCUIT HAVING TRANSFORMER FORMING SEPARATED WINDING STRUCTURE - There is provided an interleaved type power factor correction circuit having a transformer forming a separated winding structure, which is formed by integrating two inductors separately wound around the transformer. The interleaved type power factor correction circuit including a rectifying unit rectifying a commercial alternating current power, a transformer having a first inductor winding and a second inductor winding, a bobbin part, and a core part, a switching unit switching a power transmitted to the first and second inductor windings, a controlling unit controlling a switching operation of the switching unit in order to allow a phase difference between a current and a voltage of the switched power to satisfy a predetermined phase difference, and a stabilizing unit stabilizing the switched power from the switching unit. | 02-16-2012 |
20120039095 | BOOST CONVERTER - There is provided a boost converter capable of reducing internal pressure in elements without the employment of a separate snubber by clamping a voltage, transmitted to the elements, to a charging voltage or an output voltage during power conversion. The boost converter includes a transformer including a primary winding receiving input power and a secondary winding electromagnetically coupled to the primary winding and having a predetermined turns ratio therewith; a switching part allowing the input power transmitted to the primary winding to be on or off according to a predetermined switching duty; a clamping part including a link capacitor charged with the input power obtained when the switching part is switched on, and power transformed based on the predetermined turns ratio; and a stabilizing part stabilizing power outputted from the clamping part. | 02-16-2012 |
20120127762 | LLC CONVERTER ACTIVE SNUBBER CIRCUIT AND METHOD OF OPERATION THEREOF - An active snubber circuit for a power converter, a method of operating the same and an inductor inductor capacitor converter incorporating the circuit or the method. In one embodiment, the circuit includes: (1) a series-coupled first capacitor and diode associated with a secondary-side switch in the power converter and coupled to an output thereof and (2) an active snubber circuit switch coupled in parallel with the diode and configured to receive a control signal that closes the active snubber circuit switch during at least a portion of a time during which the secondary-side switch is open. | 05-24-2012 |
20120140525 | ENERGY TRANSFER ASSEMBLY WITH TUNED LEAKAGE INDUCTANCE AND COMMON MODE NOISE COMPENSATION - An energy transfer assembly with tuned leakage inductance and common mode noise compensation is disclosed. An example energy transfer assembly for use in a resonant power converter includes a first winding wound around a bobbin mounted on a magnetic core. The first winding has a first number of layers proximate to a first end along a length of the bobbin and a second number of layers proximate to a second end along the length of the bobbin. The energy transfer assembly also includes a second winding wound around the bobbin. The second winding has a third number of layers proximate to the first end along the length of the bobbin and a fourth number of layers proximate to the second end along the length of the bobbin. The first and second windings are wound around the bobbin such that at least a portion of one of the first and second windings overlaps at least a portion of an other one of the first and second windings around the bobbin. A degree of overlap between the first and second windings is non-uniform between the first and second ends along the length of the bobbin such that a ratio of the first number to the third number does not equal a ratio of the second number to the fourth number. | 06-07-2012 |
20120257420 | COIL BOBBIN, COIL COMPONENT AND SWITCHING POWER SOURCE APPARATUS - In a coil bobbin, a cover section is provided as a spacer section which abuts against a heat radiating section that functions as a heat radiating terminal of the first coil winding, from a direction following the axis line of the tubular section. Here, when performing heat radiation from the coil winding, since the cover section which abuts against the heat radiating terminal when the coil winding is fixed to the heat radiating object functions as an insulating member, then the radiation of heat from the coil winding is raised without increasing the number of parts. | 10-11-2012 |
20120287681 | Switching Delay Controller for a Switched Mode Power Supply - A switching delay controller ( | 11-15-2012 |
20130003424 | MULTI-PHASE INTERLEAVED BIDIRECTIONAL DC-DC CONVERTER WITH HIGH VOLTAGE CONVERSION RATIO - A multi-phase interleaved bidirectional DC-DC converter with a high voltage conversion ratio is provided. The multi-phase interleaved bidirectional DC-DC converter with a high voltage conversion ratio allows effective control of charge/discharge in multi-energy storage modules including a battery cell module or a super capacitor module, which is characterized in low voltage and high current output. Accordingly, a high-efficiency bidirectional DC-DC converter for use in battery charge/discharge can be implemented. | 01-03-2013 |
20130058136 | FORWARD CONVERTER TRANSFORMER SATURATION PREVENTION - A saturation prevention circuit includes a first controlled current source, a second controlled current source, an integrating capacitor, and a comparator. The first controlled current source generates a first current that is proportional to an input voltage that is to be applied to a winding of a transformer. The second controlled current source generates a second current that is proportional to a reset voltage that is to be applied to the winding. The capacitor is charged with the first current while the input voltage is applied to the winding of the transformer and discharged with the second current while the reset voltage is applied to the winding. The comparator compares a voltage on the integrating capacitor with a first threshold and generates a first signal to immediately turn off the switch when the voltage on the integrating capacitor reaches the first threshold to limit a magnetic flux in the transformer. | 03-07-2013 |
20130114309 | Battery Module - A battery module and an arrangement including a number of battery modules connected in series are disclosed. An energy store has a positive and a negative connection. A boost converter has a first and a second converter output. The energy store is connected at the positive connection of the energy store to a first connection and at the negative connection of the energy store to a second connection. The first converter output is connected to a first compensation connection and the second converter output is connected to a second compensation connection. The converter is designed to draw energy from the energy store and to provide the energy to the converter outputs of the converter in the form of current. | 05-09-2013 |
20130155727 | ISOLATED SWITCHED MODE POWER SUPPLY - An isolated switched mode power supply comprises a transformer, with primary and secondary windings, and a rectification network connected to the secondary winding. The rectification network and the transformer are arranged such that, during a free-wheeling period of operation of the switched mode power supply, a magnetic flux from a first portion of a secondary winding of the transformer substantially cancels a magnetic flux from a second portion of the secondary winding between the first and second portions of the secondary winding. Additionally, a secondary side circuit connected to the secondary winding comprises a switching device, which is connected to a centre-tap, provided between the first and second portions of the secondary winding, and an output of the rectification network so as to conduct at least a part of a free-wheeling current flowing in the secondary side circuit during the free-wheeling period. | 06-20-2013 |
20130170253 | AUXILIARY POWER GENERATION CIRCUIT - An auxiliary power generation circuit adopted for use on a filter power circuit includes a first voltage stabilization capacitor and a second voltage stabilization capacitor connecting to the first voltage stabilization capacitor via a first diode. The first and second voltage stabilization capacitors form a capacitor voltage division circuit. The first voltage stabilization capacitor and first diode are bridged by a first connection point which is connected to a short circuit element and a second diode with a set on current opposite to the short circuit element. The short circuit element has a control end connecting to a first Zener diode which is connected to a first resistor with a desired resistance. The first resistor is connected to a second connection point between the second voltage stabilization capacitor and first diode. | 07-04-2013 |
20130194833 | DRIVER CIRCUIT - A driver circuit ( | 08-01-2013 |
20130194834 | POWER SYSTEM WITH SHARED CLAMP RESET - An example power supply includes a first power converter, a second power converter, and a shared clamp reset circuit. The first power converter is adapted to convert an input to a first voltage output and includes a first diode and a first transformer having a first primary winding. The second power converter is adapted to convert the input to a second voltage output and includes a second diode and a second transformer having a second primary winding. The shared clamp reset circuit is included in the first power converter and is coupled to the cathode of the first diode. The shared clamp reset circuit also includes a clamp connection that is coupled to the cathode of the second diode. The shared clamp reset circuit is adapted to manage leakage inductance energy within the first transformer and within the second transformer. | 08-01-2013 |
20130201728 | FORWARD CONVERTER WITH MAGNETIC COMPONENT - A forward converter comprises a magnetic component with a transformer and a filter output inductor. Also disclosed is a method for assembly of a forward converter. A first and a second U/UR core are arranged to form an O-core. Windings of the transformer are arranged on the O-core. A bobbin-less U/UR core is arranged to abut the O-core, and windings of a filter output inductor are arranged directly on a body section of the bobbin-less U/UR core. Alternatively, windings of the transformer are arranged on a first section of an E/ER core, and windings of the filter output inductor are arranged directly on a second, bobbin-less section of the E/ER core. | 08-08-2013 |
20130215648 | SWITCHING POWER SUPPLY DEVICE - A switching power supply device includes: a power factor correction circuit having a step-up chopper circuit including a chopper switching element and a power factor correction control unit controlling a switching operation of the chopper switching element; a DC/DC converter having a transformer, a switching circuit, a rectifier circuit, a smoothing circuit, and a DC/DC converter control unit; and a control ON/OFF circuit controlling the ON/OFF states of an output voltage of the DC/DC converter circuit. The switching circuit is provided at a primary winding side of the transformer. The rectifier circuit and the smoothing circuit are provided at a secondary winding side of the transformer. The control ON/OFF circuit controls the ON/OF states of the output voltage of the DC/DC converter circuit by controlling the power factor correction control unit and the DC-DC converter control unit based on an external signal. | 08-22-2013 |
20130229830 | Operating A DC-DC Converter - Operating a DC-DC converter that includes: a directly coupled inductor with a first and second coil element, the first and second coil element coupled to an output filter and a load; and power-switching phases, including: a first power-switching phase that includes a high-side and low-side switch, where the high-side switch is configured, when activated, to couple a voltage source to the first coil element and the low-side switch is configured, when activated, to couple the first coil element to a ground voltage; and a second power-switching phase that includes a high-side and low-side switch, where the high-side switch is configured, when activated, to couple the voltage source to the second coil element and the low-side switch is configured, when activated, to couple the second coil element to the ground voltage; and the switches are activated alternatively with no two switches are activated at the same time. | 09-05-2013 |
20130229831 | Operating A DC-DC Converter - Operating a DC-DC converter on a chip that includes: micro-power-switching phases and magnetic material, each phase including: a high-side and low-side switch with control inputs for activating the switch, and an output node; where: the output node of each phase extrudes through the magnetic material to form, in each phase, a torodial inductor with a single loop coil, and to form, for the plurality of phases, a directly coupled inductor; the output node of each micro-power-switching phase is coupled to a filter and a load; each high-side switch is configured, when activated, to couple a voltage source to the phase's single loop coil; and the low-side switch of each phase is configured, when activated, to couple the phase's single loop coil to a ground voltage and the switches are alternatively activated where no two switches of any phase are activated at the same time. | 09-05-2013 |
20130235619 | TRANSFORMER CAPABLE OF SUPPRESSING COMMON MODE CURRENT AND POWER CONVERTER THEREOF - A transformer capable of suppressing common mode current and a power converter thereof are provided. The transformer comprises a primary winding, a secondary winding, a magnet core and a shielding winding layer. The shielding winding layer has a first shielding winding and a second shielding winding. A voltage jump direction of the first shielding winding is constantly opposite to that of the second shielding winding. The shielding winding layer is coupled to a static terminal coupled with the primary winding or the secondary winding. | 09-12-2013 |
20130242619 | RESET VOLTAGE CIRCUIT FOR A FORWARD POWER CONVERTER - An example method includes controlling a duty ratio of a switch to regulate an output of a forward power converter and storing a first voltage. The first voltage is equal to an input voltage of the forward power converter when the input voltage is at a steady-state value. The method also includes resetting a transformer of the forward power converter when the switch is in an OFF state by setting a voltage across a primary winding of the transformer to the stored first voltage in response to a drop in the input voltage to below the steady-state value. Further included in the method is increasing the duty cycle of the switch to greater than fifty (50) percent in response to the drop in the input voltage to maintain regulation at the output of the forward power converter. | 09-19-2013 |
20130258721 | CONTROL DEVICE EMPLOYED IN A SWITCHED ELECTRICAL POWER SUPPLY SYSTEM - The invention relates to a control device ( | 10-03-2013 |
20130272034 | METHOD OF FORMING A LOW POWER DISSIPATION REGULATOR AND STRUCTURE THEREFOR - In one embodiment, a method of forming a conditioning circuit includes configuring an output biasing network to provide a biasing voltage to an MOS transistor to enable the MOS transistor to operate in a saturated operating mode for input voltages that are less than a threshold voltage. | 10-17-2013 |
20130336018 | CONVERTER - A converter is configured with a transformer that has a primary coil and a secondary coil, a first switching element that is serially connected to the primary coil, a control circuit that controls the first switching element, and a firs rectifying element that supplies electric power to the control circuit. A ground potential of the control circuit and the first rectifying element are connected to the primary coil at different points. Accordingly, an inverter is miniaturized and manufacturing costs are reduced. | 12-19-2013 |
20140003095 | BIDIRECTIONAL DC-DC CONVERTER | 01-02-2014 |
20140056035 | METHOD AND ARRANGEMENT FOR IMPROVED OPERABILITY OF A HIGH TEMPERATURE FUEL CELL SYSTEM - An arrangement for improved operability of a high temperature fuel cell device at higher fuel cell voltage values than nominal voltage values, each fuel cell in the fuel cell device including an anode side, a cathode side, and an electrolyte between the anode side and the cathode side, and the arrangement includes means for determining temperature information of the fuel cells and main power converter for loading fuels cells at least up to their rated power level. The arrangement includes a non-isolating pre-regulator for reducing the fuel cell voltage to a voltage level useable for the main power converter at least at substantially low power levels in start-up and low current load situations when the fuel cell voltage is significantly higher than in nominal operation conditions, the pre-regulator being located between the fuel cells and the main power converter, and the arrangement includes bypass means for bypassing the pre-regulator at substantially high current loads when the fuel cell voltage has decreased to the voltage level suitable for an input voltage of the main power converter. | 02-27-2014 |
20140071716 | High efficient single switch single stage power factor correction power supply - A single switch PFC power supply (including forward and fly-back power supply) in single stage has two transformers: one forward transformer, one main transformer. The main transformer transfers electrical power from the primary circuit to secondary circuit. The forward transformer is used to correct input current waveform. The two transformer's primary windings are connected in series. An extra winding of the forward transformer, a capacitor and two diodes are formed a no loss snubber circuit to enhance the efficiency of the power supply. | 03-13-2014 |
20140098576 | LOAD CHANGE DETECTION FOR SWITCHED MODE POWER SUPPLY WITH LOW NO LOAD POWER - A pulse scheme is used for load change detection in a switching mode power supply with low no-load power consumption. The pulse scheme includes a measurement pulse for determining a load condition or a no-load condition at the output. Generation of the measurement pulse results in sufficient energy transfer to the secondary side to accurately measure the output voltage via a reflected voltage on the primary side. Once in no-load operation mode, a reference pulse having a lower energy transfer than the measurement pulse is used to determine a baseline reflected voltage value that corresponds to a no-load condition. Successive detection pulses are then generated and corresponding reflected voltage measured and compared to the baseline reflected voltage. A change in the reflected value that exceeds a threshold value is indicative of a change in the no-load condition. | 04-10-2014 |
20140098577 | METHOD TO CONTROL A MINIMUM PULSEWIDTH IN A SWITCH MODE POWER SUPPLY - A power converter circuit includes a transformer and a main switch controller by a primary side controller. A sensing circuit is implemented that senses the voltage at an auxiliary winding of the transformer while the main switch is ON. The auxiliary winding is another winding on the primary side of the transformer, magnetically coupled to the secondary winding and electrically isolated from the primary winding. When the voltage across the auxiliary winding reaches a predefined threshold voltage level, the main switch is switched OFF. The threshold voltage level is set at a value that minimizes an amount of energy transferred per pulse to the secondary side of the circuit while maintaining a minimum amount of energy transfer to enable output voltage sensing at the auxiliary winding. | 04-10-2014 |
20140153294 | AC/DC Power Converter Arrangement - A converter arrangement, includes a DC/DC stage comprising a plurality of DC/DC converters. Each of the plurality of DC/DC converters is operable to receive one of a plurality of direct input voltages. The DC/DC stage is configured to generate an output voltage from the plurality of direct input voltages. | 06-05-2014 |
20140169041 | DC TO DC CONVERTING CIRCUIT - The invention provides a DC to DC converting circuit, comprising: a transforming unit with a primary winding and a secondary winding; a bridge rectifier unit coupled to an input voltage, having a first output terminal and a second output terminal coupled to both side of the primary winding respectively; a first switch coupled between the input voltage and the first output terminal; a second switch coupled between the first output terminal and a ground terminal; a third switch coupled between the input voltage and the second output terminal; and a fourth switch coupled between the second output terminal and the ground terminal; an output unit paralleled to the secondary winding; and a clamping unit coupled to the input voltage and paralleled to the bridge rectifier unit, having an auxiliary switch coupled to the input voltage; and a clamping capacitor coupled between the auxiliary switch and the ground terminal; wherein the auxiliary switch is turned on when operation statuses of the first switch and the fourth switch or the second switch and the third switch are changed. | 06-19-2014 |
20140185331 | ACTIVE FORWARD MODE RECTIFIER - A power converter includes a transformer having a primary winding and a secondary winding, a primary side circuit coupled to the primary winding, and a secondary side circuit coupled to the secondary winding and configured to output a substantially direct current (DC) output. The primary side circuit is configured to receive an input voltage and to switch the input voltage across the primary winding of the transformer. The secondary side circuit includes an active forward mode rectifier. | 07-03-2014 |
20140254209 | ELECTRIC POWER CONVERSION SYSTEM - An electric power conversion system includes: a primary electric power conversion circuit including primary right and left arms; a secondary electric power conversion circuit including secondary right and left arms; and a control circuit controlling transfer of electric power between the primary and secondary electric power conversion circuits by magnetically coupling a primary coil to a secondary coil. The control circuit sets an interphase difference in switching between right and left arm lower transistors in the primary electric power conversion circuit and an interphase difference in switching between right and left arm lower transistors in the secondary electric power conversion circuit on the basis of off times of the primary and secondary electric power conversion circuits such that a phase difference between terminal voltage waveforms of the primary and secondary coils is 0 and duty ratios of the terminal voltage waveforms are equal to each other. | 09-11-2014 |
20140268909 | METHODS AND SYSTEMS FOR CONTROL OF DC-DC CONVERTERS - Switching regulator methods and systems for supplying output current at a regulated voltage level to a load. The regulator has a primary side that is galvanically isolated from a secondary side. The regulator includes a transformer having a primary winding on the primary side and a secondary winding on the secondary side, coupled to a load. A switch, coupled to the primary winding, controls current flow through the primary winding. A first feedback control loop, responsive only to primary side signal values, regulates a constant average voltage at the output node. An optional second feedback control loop, responsive only to primary side signal values, reduces voltage ringing at the output node. | 09-18-2014 |
20140268910 | COUPLED INDUCTOR DC STEP DOWN CONVERTER - A step down power converter include a switch, an inductor, a diode, a capacitor, and a winding magnetically coupled to the inductor. The diode, the inductor and the capacitor are coupled in series, and the transistor, the coupled winding and the capacitor are coupled in series. An output voltage Vout is supplied across the capacitor. When the switch is ON, energy is transferred from an input supply voltage to a load coupled across the capacitor, and current flows through the coupled winding thereby storing energy in the winding. When the switch OFF, current does not flow through the coupled winding, but the energy stored in the winding induces current in the magnetically coupled inductor, thereby delivering energy from the winding to the load. | 09-18-2014 |
20140334195 | MANAGING LEAKAGE INDUCTANCE IN A POWER SUPPLY - An apparatus includes: a power supply circuit including at least a first stage having a push-pull circuit topology, the first stage including at least one transformer that isolates a primary side of the first stage from a secondary side of the first stage; a clamp circuit coupled to a center tap of the transformer, the clamp circuit including a first element that stores energy, and a second element that controls a flow of current between the center tap of the transformer and the first element; and a control module receiving power from the clamp circuit. The control module is configured to provide control signals to one or more elements of the power supply circuit. | 11-13-2014 |
20140334196 | CONTROL DEVICE FOR MULTIPHASE INTERLEAVED DC-DC CONVERTER AND CONTROL METHOD THEREOF - This instant disclosure provides a control method for interleaved multiphase Boost PFC converter. The interleaved multiphase Boost PFC converter has a master phase and a plurality of slave phases, the master phase operates in the critical conduction mode, the master of each slave phase has an inductor and a power switch. The control method comprises, configuring the phase difference between each slave phase and the master phase; setting up each slave phase to operate in the critical conduction mode; monitoring the operating mode of each slave phase is in the continuous conducting mode, the discontinuous conducting mode, or the critical conduction mode when the system is disturbed; and adjusting the power switch on time of the slave phase according to the operating mode of the slave phase so as to make the slave phase return to operate in critical conduction mode. | 11-13-2014 |
20150016153 | PULSE MODE ACTIVE CLAMPING - An active clamp circuit includes a clamp capacitance and a clamp switch coupled in a circuit path, and a diode coupled across the clamp switch. | 01-15-2015 |
20150062974 | Controller IC with Zero-Crossing Detector and Capacitor Discharge Switching Element - An integrated circuit (IC) for controlling the discharge of a capacitor coupled across first and second input terminals of a power converter circuit, wherein the first and second terminals for receiving an ac line voltage. The IC includes a switching element coupled across the first and second input terminals and a detector circuit. The detector circuit including first and second comparators that produce first and second output signals responsive to a zero-crossing event of the ac line voltage. The first and second output signals being used to generate a reset signal coupled to a timer circuit responsive to the zero-crossing event. When the reset signal is not received within a delay time period, the timer circuit outputs a discharge signal that turns the switching element on, thereby discharging the capacitor. | 03-05-2015 |
20150117067 | ENERGY CONVERSION SYSTEMS WITH POWER CONTROL - In one embodiment, a power conversion system includes a controller to provide power control to a converter, and a distortion mitigation circuit. In another embodiment, a system includes a converter to transfer power between a power source and a load having fluctuating power demand, and a controller to provide power control, where the controller may selectively disable the power control. In another embodiment, a power conversion system includes a controller to generate a drive signal to provide power control to a power path in response to a sense signal from the power path, where the sense signal is taken from other than the input of the power path, or the drive signal is applied to the power path at other than a first power stage. | 04-30-2015 |
20150131338 | POWER CONVERSION APPARATUS - An isolated power conversion apparatus has an isolation transformer, a series circuit including a load and an inductor connected in series with each other, the series circuit being disposed on a secondary side of the isolation transformer, and one or a plurality of switching means disposed between the series circuit and the secondary side of the isolation transformer, the switching means being bidirectional. This apparatus sends out power from a DC power supply of a primary side of the isolation transformer toward the load as DC power or AC power of an arbitrary polarity, or regenerates and supplies the DC power or AC power from the load to the DC power supply. | 05-14-2015 |
20150131339 | POWER CONVERSION APPARATUS - An isolated power conversion apparatus has an isolation transformer, a series circuit including a load and an inductor connected in series with each other, the series circuit being disposed on a secondary side of the isolation transformer, and one or a plurality of switching means disposed between the series circuit and the secondary side of the isolation transformer, the switching means being bidirectional. This apparatus sends out power from a DC power supply of a primary side of the isolation transformer toward the load as DC power or AC power of an arbitrary polarity, or regenerates and supplies the DC power or AC power from the load to the DC power supply. | 05-14-2015 |
20150138846 | CONSTANT CURRENT CONTROL CIRCUIT FOR POWER CONVERTER AND CONSTANT CURRENT CONTROL METHOD THEREOF - A constant current control circuit includes a sample and hold unit coupled to a current sensing resistor of a power converter, for storing a current sensing voltage of the current sensing resistor; a first capacitor for storing a comparison voltage; a discharge unit coupled between the sample and hold unit and the first capacitor, for controlling a discharge current of the first capacitor according to a reference voltage and the current sensing voltage stored in the sample and hold unit; a charge unit coupled to the first capacitor, for controlling a charging current of the first capacitor according to the reference voltage and a ground voltage; and a comparator for comparing the comparison voltage with the reference voltage to generate a comparison result, and outputting a control signal according to the comparison result, in order to control a duty cycle of the power converter. | 05-21-2015 |
20150138847 | CONVERTER - A converter may include a transformer; a first circuit arrangement coupled to a first transformer side; a second circuit arrangement coupled to a second transformer side, wherein the second circuit arrangement is configured to provide an output voltage; a first coupler configured to provide information about the output voltage to the first circuit arrangement; wherein the first circuit arrangement is configured to determine a state of the secondary side based on the received information about the output voltage, and to generate a switch control signal dependent on the determined state; a switch circuit arranged on the second side; and a second coupler configured to provide a switch control signal from the first circuit arrangement to the switch circuit; wherein the switch circuit is coupled to the first circuit arrangement to provide a first circuit arrangement control signal to the first circuit arrangement depending on the switch control signal. | 05-21-2015 |
20150303815 | MODULAR DC-DC CONVERTER - A modular dc-dc boost converter system is provided that can substantially improve efficiency over a wide range of input and output voltages. The system includes three modules: a buck module, a boost module, and a dc transformer module. These modules are interconnected such that the system output voltage is equal to the sum of the output voltages of adc-dc converter module and a dc transformer module. Depending on the operating point, one or more modules may operate in passthrough mode, leading to substantially reduced ac losses. The required capacitor size and the transistor voltage ratings are also substantially reduced, relative to a conventional single dc-dc boost converter operating at the same input and output voltages. | 10-22-2015 |
20150303816 | POWER SWITCHING CONVERTER - A circuit includes a transformer with a primary, secondary, and auxiliary. A first control circuit actuates a first switch circuit based on a wake-up signal to cause the primary to transmit power to the secondary. A second control circuit actuates a second switch circuit based on an output voltage at the secondary being less than a threshold to generate the wake-up signal to the secondary for transmission to the auxiliary. The second switch circuit has a transistor with a source coupled to a reference node, a gate coupled to the second control circuit. A first diode has an anode coupled to the source and a cathode coupled to the drain, and blocks flow of current from the drain to the source. A second diode has an anode coupled to the substrate and a cathode coupled to the drain, and blocks flow of current from the drain to the substrate. | 10-22-2015 |
20150303817 | DRIVER DEVICE AND DRIVING METHOD FOR DRIVING A LOAD - The present invention relates to a driver device ( | 10-22-2015 |
20150311812 | ACTIVE CLAMP FORWARD DC-DC CONVERTER CIRCUIT - There is provided an active clamp forward DC-DC converter circuit that includes an insulated transformer having a primary coil and a switching circuit connected to the primary coil of the insulated transformer. The switching circuit includes a first circuit and a second circuit that is connected in parallel to the first circuit. The switching circuit further includes a first rectifying element or a second rectifying element or a third power storage element. The first circuit includes a first switching element and a second switching element that are connected in series. The second circuit includes a third switching element, a fourth switching element, a first power storage element and a second power storage element that are connected in series. | 10-29-2015 |
20150326132 | Symmetrical Power Converter - A switched-capacitor circuit has two capacitors and two MOSFETs that cross-couple the capacitors, connecting the anode of one to the cathode of the other, and vice-versa. When either MOSFET is on, the capacitors are in series; the order alternates as the MOSFETs alternate. A reversing cyclical voltage suitable as a primary drive for a transformer is generated. If the MOSFETs alternate with no dead-time, a square-wave excitation is generated. With off-time, a pwm excitation is generate. Charge is maintained on the switched-capacitors using a symmetrical common-mode inductor. A bifilar winding is center-tap as its input, and the ends of the bifilar winding are connected to the capacitors. The capacitors are effectively in parallel. Because the charging current flows and returns through each leg of the inductor equally, it cannot magnetize the inductor core or cause any flux change. Because any voltages induced in the windings are common-mode, flux change in the core does not affect the charging current. The ac voltage generated when the capacitors switch is across the full inductor. Not only does the inductance attenuate any noise, the center-tap is between equal and opposite negative and positive voltages, which cancel. There is very little noise at the input. The circuit is reciprocal, so it can be used to rectify a transformer output. Two can be used as a bi-directional transformer isolated power converter. Several modules using 1 to 1 transformers can be stacked for a power converter having a higher ratio of input to output voltage. | 11-12-2015 |
20150333640 | Forward-Flyback Topology Switched Mode Power Supply - A switched mode power supply ( | 11-19-2015 |
20150340958 | CIRCUIT STRUCTURE AND METHOD FOR REDUCING POWER CONSUMPTION OF DEVICE INCLUDING ACTIVE MODULE AND PASSIVE MODULE - Embodiments of the present invention disclose a circuit structure and a method for reducing power consumption of a device including an active module and a passive module. The circuit structure comprises: an active module ( | 11-26-2015 |
20150372606 | Control Device of DC-DC Converter - An object is to suppress deterioration of a high-voltage side battery regardless of the magnitude of a load current. Provided is a control device of a DC-DC converter that is constituted by a primary side circuit that is electrically connected between an input side and a transformer, and a secondary side circuit that is electrically connected between an output side and the transformer. The control device includes a command generating unit | 12-24-2015 |
20160049877 | INDUCTANCE VARYING CIRCUIT AND POWER SUPPLY APPARATUS INCLUDING THE SAME - A power supply apparatus may include a transformer unit outputting a voltage transformed depending on an inductance ratio between a primary side and a secondary side, an inductance varying unit varying an inductance of the primary side depending on whether or not external input power is being input, and an output unit stabilizing the transformed voltage and outputting the stabilized voltage. | 02-18-2016 |
20160049878 | POWER CONVERTER AND DRIVING METHOD FOR THE SAME - The object of the present invention is to provide a power converter with a wide range of an output voltage and a driving method for the same. | 02-18-2016 |
20160056725 | CONTROL VOLTAGE ADJUSTING CIRCUIT, FEEDBACK SIGNAL GENERATING CIRCUIT, AND CONTROL CIRCUIT INCLUDING THE SAME - A feedback signal generating circuit may include a control voltage adjusting circuit outputting a feedback voltage by comparing a control voltage input from an external voltage source with a reference voltage and adjusting a ratio of control voltage drop, and an amplifying circuit generating a feedback signal by differentially amplifying the feedback voltage and a detection voltage associated with a current flowing in a load. | 02-25-2016 |
20160056726 | STEP-UP OR STEP-DOWN CONVERTER COMPRISING A BYPASS CAPACITOR - A converter includes a converter inductor, a converter diode, and a converter switch, wherein the converter inductor, the converter diode and the converter switch operate together to receive an input voltage and generate a converted output voltage. The converter further includes a bypass circuit that is connected in parallel with the converter switch; the bypass circuit includes a bypass capacitor connected in series with a diode, wherein a forward direction of the diode is the same as a regular direction of current flow through the converter switch. The converter also includes a discharge circuit configured to discharge the bypass capacitor, wherein the discharge circuit includes an inductor. The inductor of the discharge circuit is magnetically coupled to the converter inductor. | 02-25-2016 |
20160065048 | Split Rail PFC and AC Inverter Architecture - A power conversion system including power factor correction circuitry and power inversion circuitry. The power factor correction circuitry has a split-rail configuration and includes a bidirectional switch used to produce intermediate direct current power. The power inversion circuitry selectively operates switches to produce sinusoidal alternating current output power. The output power and the intermediate power are regulated together. | 03-03-2016 |
20160079869 | Clamping Apparatus And Method - A protection circuit protects transistors in a DC-DC conversion circuit from over voltages. The transistors in the conversion circuit include first and second transistors. Converted energy is driven across a transformer by an H-bridge circuit. With a first configuration of the H-bridge circuit, a third transistor is turned on to discharge an inductor that was previously charged. The inductor is coupled to the third transistor. The discharging of the inductor boosts an output current of the conversion circuit. A capacitor is charged through a diode. The capacitor and diode are disposed in the protection circuit. The diode is coupled to the first transistor and the charging of the capacitor is effective to limit voltage across the first transistor. | 03-17-2016 |
20160079872 | POWER CONVERTER - In an embodiment of the present invention, a power converter for applying a voltage to a load having at least one channel includes a power supply for storing and outputting a floating voltage lower than a forward voltage of the channel and a converter for receiving and converting a link voltage to generate a first voltage, thereby transmit the voltage higher than the forward voltage of the channel. | 03-17-2016 |
20160079873 | MAGNETICALLY COUPLED REACTOR AND POWER CONVERTER - A magnetically coupled reactor includes a coupled core member, a first coil, and a second coil. The coupled core member includes a first core and a second core made of a magnetic material and disposed to face each other, a coil channel, and a sheet-like magnetic body by which a coupling portion between cores is put between the first core and the second core at an outer portion of the first and second cores. Each coil is wound around a leg through the coil channel in a lap winding manner such that the coils are overlapped on top of each other in the coil channel when seen in an axial direction. The sheet-like magnetic body extends from the coupling portion between coils into the coil channel and includes a portion arranged between coils located between the coils in the axial direction. | 03-17-2016 |
20160093432 | Interleaved Transformer/Inductor - An interleaved transformer or a transformer and integrated set of inductors formed via a magnetic structure comprising a set of E cores and an I core inserted between the set of E cores is provided in order to address issues that occur when a structured transformer is coupled together with inductor flux. Actual inductance exhibited by the transformers is controlled by a preselected precise gap between the I core and each of the E cores. The advantage of such a structured transformer cancels out the magnetic flux in certain legs of the magnetic structure requiring less magnetic material and thus, less core losses while improving the overall efficiency of a power supply. | 03-31-2016 |
20160105118 | POWER SUPPLY APPARATUS AND APPARATUS AND METHOD FOR CONTROLLING SWITCHED-MODE POWER SUPPLY (SMPS) - A power supply apparatus may include: a pulse voltage generating unit generating a pulse voltage; a direct current (DC) voltage output unit converting the pulse voltage into a DC voltage; a sensing unit sensing a level of the DC voltage and a level of an output current output from the DC voltage output unit; a calculating unit calculating an amount of output power based on the level of the DC voltage and the level of the output current sensed by the sensing unit; and a controlling unit controlling the pulse voltage generating unit based on the amount of output power calculated by the calculating unit and an amount of reference power. | 04-14-2016 |
20160105119 | POWER CONVERSION APPARATUS - A control unit controls the amplitude of at least either an output voltage or an output current by shifting at least either a first on time or a second on time. | 04-14-2016 |
20160111965 | EMBEDDED MAGNETIC COMPONENT TRANSFORMER DEVICE - An embedded transformer device includes first, second, and auxiliary windings, defined in an insulating substrate by conductive vias joined together by conductive traces. The positions of the conductive vias are arranged to optimize the isolation properties of the transformer and to reduce the coupling of the transformer by increasing the leakage inductance. The embedded transformer device provides better isolation between input side and output side windings, and allows an oscillating LC circuit to be set up in the case of a short circuit, preventing high power from extending between the input and output terminals and thereby avoiding damage to the connected electrical components. | 04-21-2016 |
20160118902 | ELECTRIC POWER SUPPLY SYSTEM COOPERATED BY A BATTERY AND A SUPER CAPACITOR - An electric power supply system cooperated by a battery and a super capacitor includes a power source module and a processing unit. The power source module includes an electric power transformer, a battery, and a super capacitor. The electric power transformer is electrically connected to the battery and the super capacitor. The processing unit is electrically connected to the electric power transformer for controlling the battery to charge the super capacitor, such that both the battery and the super capacitor supply electricity to the load, and such that electricity generated by the load can recharge the super capacitor. The electricity power supply system can avoid an increase of the working temperature of the battery. | 04-28-2016 |
20160118903 | COMPENSATION APPARATUS AND INDUCTOR-BASED APPARATUS - A compensation apparatus including a primary circuit and a compensation circuit is provided. The primary circuit provides a first voltage, a second voltage, and a first current flowing through a first inductor. The primary circuit includes the first inductor and a function circuit generating an input signal. The first inductor is coupled between a first terminal with the first voltage and a second terminal with the second voltage. The compensation circuit includes a second inductor and a current source circuit. The second inductor is coupled between a third terminal with a third voltage and a fourth terminal with a fourth voltage. The current source circuit outputs a second current flowing through the second inductor. The current source circuit adjusts a frequency of the input signal. The primary circuit and the compensation circuit are coupled via the first inductor and the second inductor. | 04-28-2016 |
20160126849 | POWER CONVERTER - A power converter includes a circuit board having an elongated anode receiving an input voltage and an input current and an elongated cathode providing an output voltage and an output current, and a plurality of diodes electrically arranged in parallel between the anode and cathode. The parallel diodes convert the input voltage to an output voltage, convert the input current to an output current. | 05-05-2016 |
20160141965 | SWITCHING ELEMENT DRIVING POWER SUPPLY CIRCUIT - According to one embodiment, there is provided a switching element driving power supply circuit that converts a main circuit voltage into a driving voltage of power-converting switching elements. The circuit includes a plurality of insulating power supplies, and a plurality of switching element driving power supply units. The insulating power supplies have respective direct-current input circuit ends connected in series, respective input-side circuits and output-side circuits insulated from each other, and respective output circuit ends connected in parallel. The power supply units are connected in parallel with the output circuit ends, and supplying power to the gate driving circuits of the power conversion switching elements. | 05-19-2016 |
20160141967 | DC POWER SUPPLY SYSTEM - Embodiments of the present disclosure provide a direct current (DC) power supply system, comprising: a medium voltage AC switchgear, configured to distribute a medium voltage three-phase AC received from an external supply for a next stage; a phase-shift transformer serving as the next stage, coupled to the medium voltage AC switchgear, and configured to lower the medium voltage three-phase received and output four or more groups of low voltage three-phase AC; and an uncontrolled rectifying circuitry, comprising a plurality of uncontrolled rectifiers configured to receive the four or more groups of low voltage three-phase AC respectively and output a low voltage DC; wherein the four or more groups of low voltage three-phase AC have a predetermined phase difference between each other. | 05-19-2016 |
20160149504 | START-UP CONTROLLER FOR A POWER CONVERTER - Power converters, e.g., AC/DC and DC/DC, typically have unique circuitry for a proper graceful start-up and to develop correct operating voltage biases. Typically this unique circuitry is incorporated in a primary-side controller. This primary-side controller could also be the primary means of control of the power converter once started. However, a secondary-side controller is typically needed for more exact output voltage regulation, duplicating circuitry already present in the primary-side controller. Complication is typically added by linear communication between the two controllers across an isolation barrier. A simplified primary-side start-up controller is envisioned providing minimal circuitry to power up a converter until a secondary-side controller activates and takes control by sending discrete PWM commands across the isolation barrier instead of a linear signal. The start-up controller can provide voltage and current protection if the secondary-side controller fails. The secondary-side controller can be an analog and/or digital design for sophisticated converter control. | 05-26-2016 |
20180026540 | MODULAR DC-DC CONVERTER | 01-25-2018 |