| Entries |
| Document | Title | Date |
|---|
| 20080205102 | Power Supply - A power supply (V | 08-28-2008 |
| 20080205103 | POWER FACTOR CONTROL SYSTEMS AND METHODS - A boost converter comprises an inductance that receives an input signal. A switch controls current supplied via the inductance to a load. A power factor control module comprises a mode control module that selects an operating mode of the boost converter and a switch control module that switches the switch at a frequency. The frequency is equal to a first frequency when the mode control module selects a continuous mode and equal to a second frequency when the mode control module selects a discontinuous mode. The first frequency is greater than the second frequency. | 08-28-2008 |
| 20080247203 | Energy Efficient Power Converter - There is disclosed a power supply and method. The power supply may include a power converter for converting AC primary power into DC power, the power converter having a normal operating mode and a low power quiescent operating mode. A DC power plug may be adapted to deliver DC power from the power converter to a load. The normal operating mode and the low power quiescent operating mode of the power converter may be selected by a switch integrated into the DC power plug. | 10-09-2008 |
| 20080298101 | INTELLIGENT DEAD TIME CONTROL - A circuit for reducing switching losses in a synchronous rectifier of a switching stage including a high-side control transistor and a low-side synchronous transistor coupled at a switching node, the switching stage receiving an input voltage and providing a controlled output voltage at an output node. The circuit including a first circuit portion for sensing waveshape edges of a first signal at a gate terminal of the low-side synchronous transistor and a first voltage to determine a delay between the waveshape edge of the first signal and the waveshape edge of the first voltage; and a second circuit portion for calibrating the first signal and the first voltage to align the waveshape edge of the first signal and the waveshape edge of the first voltage, with an optional offset to achieve minimal power loss. | 12-04-2008 |
| 20090027930 | AC-DC CONVERTER - An AC-DC converter includes a rectifier DB for rectifying an alternating current supplied from an alternating power source AC, a power factor controller | 01-29-2009 |
| 20090027931 | AC-DC CONVERTER - An AC-DC converter includes a rectifier DB for rectifying an alternating current supplied from an alternating power source AC, a power factor controller | 01-29-2009 |
| 20090091958 | DEVICE FOR SIMULATING RECTIFIED CONSTANT IMPEDANCE LOAD AND METHOD THEREOF - The device for simulating a rectified constant impedance load provide by the present invention is to test a power product and comprises an analog-digital converter, a digital signal processor, a digital-analog converter, and an active electrical load module in order to replacing the passive components of a traditional rectified passive load. method for simulating a rectified constant impedance load being applied to test a power product and comprising the steps of: (S1) replacing the plurality of passive components of the rectified constant impedance load with a digital control module and an active electrical load module; (S2) establishing a passive load model function in order to represent the application relationships of the plurality of the passive components; (S3) executing the operation of the passive load model function by the digital control module in order to gain a load current value, and transferring the load current value to an analog control signal via the digital control module; and (S4) controlling the active electrical load module via the analog control signal so as to draw currents from the power product. | 04-09-2009 |
| 20090097288 | OUTPUT POWER SWITCHING VECTOR SCALING SYSTEM AND METHOD - A power converter control system and method is provided to maximize the power output of the converter where an overload condition is present. A controller calculates a command voltage and command power factor. The command voltage and command power factor are used to generate a switching vector. Where the voltage associated with a switching vector exceeds an output voltage limit of the converter, a power factor adjustment is generated. | 04-16-2009 |
| 20090097289 | FEEDBACK COMMUNICATION TECHNIQUE FOR SWITCHED MODE POWER SUPPLY - A power conversion circuit for a switched mode power supply (SMPS) | 04-16-2009 |
| 20090116269 | Power supply with reduced power consumption when a load is disconnected from the power supply - Detection and control circuitry are added to a conventional power supply to detect when a load, such as a portable electronic device, has been disconnected from the power supply and, when disconnected, interrupt a current path to the primary windings of a transformer within the power supply to substantially reduce the amount of reactive power that is consumed by the power supply. | 05-07-2009 |
| 20090129130 | POWER CONVERTER - This invention relates to a power converter ( | 05-21-2009 |
| 20090154206 | Circuit and associated method for reducing power consumption in an a power transformer - A method and circuit is provided for reducing power consumption in a power transformer, typically incorporated into an electrical or electronic device such as a consumer device. In an embodiment, a detection/isolation circuit is coupled to an input of a power transformer/rectifier via a switching device. The switching device can be, for example, a solid state relay. The detection/isolation circuit is configured to sense the occurrence of no-load conditions in the power transformer and responsively disengage the power transformer from a coupled source of power (e.g., wall outlet) via the coupled switching device. | 06-18-2009 |
| 20090168475 | CONVERTER POWER SUPPLY CIRCUIT AND CONVERTER POWER SUPPLY DRIVING METHOD - A converter power supply circuit | 07-02-2009 |
| 20090262562 | EFFICIENCY IMPROVEMENT IN POWER FACTOR CORRECTION - An power converter that is operable to convert AC power into DC power that may be delivered to a load. The power converter includes a transformer and a controllable switch. The switching frequency of the power converter is configured to be dependent on the level of the AC voltage of an AC power source. The switching frequency may be proportional to the AC voltage to provide a constant magnetic flux density swing for the transformer in the power converter. The switching frequency may be controlled by using a circuit that converts the AC voltage from the AC power source into a frequency signal that is proportional to the AC voltage. | 10-22-2009 |
| 20090268492 | Switching Regulator and Electronic Device Therewith - A switching regulator ( | 10-29-2009 |
| 20090268493 | POWER-ON RESET CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - A power-on reset circuit connected to an external DC power source includes a delay circuit, a rectifying circuit, and a logic operation circuit. The delay circuit includes a first delay unit used for outputting a first delaying reference signal and a second delay unit used for outputting a second delaying reference signal. The rectifying circuit connected to the delay circuit includes a first rectifying unit and a second rectifying unit. The first rectifying unit is connected to the first delay circuit used for rectifying the first delaying reference signal to output a first rectified signal. The second rectifying unit is connected to the second delay circuit used for rectifying the second delaying reference signal to output a second rectified signal. The logic operation circuit is connected to the rectifying circuit used for outputting a reset signal according to the first rectified signal and the second rectified signal. | 10-29-2009 |
| 20090279331 | Acdc converter - This invention relates to an ACDC converter ( | 11-12-2009 |
| 20090279332 | Flyback constant voltage converter having both a PWFM mode and a PWM mode - A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is regulated using both pulse width modulation and pulse frequency modulation. Both types of modulation are used simultaneously. In a second sub-mode (“low output power sub-mode”), VOUT is regulated using pulse width modulation, but the converter switching frequency is fixed at a first frequency. By setting the first frequency at a frequency above the frequency limit of human hearing, an undesirable audible transformer humming that might otherwise occur is avoided. In some embodiments, the converter has a third sub-mode (“high output power sub-mode”), in which pulse width modulation is used but the switching frequency is fixed at a second frequency. By proper setting of the second frequency, undesirable EMI radiation and other problems that might otherwise occur are avoided. | 11-12-2009 |
| 20100073974 | DIGITAL PEAK INPUT VOLTAGE DETECTOR FOR A POWER CONVERTER CONTROLLER - An example integrated circuit controller for a power converter includes a digital peak detector and a switching block. The digital peak detector is coupled to output a digital count signal representative of a peak input voltage of the power converter. The switching block is coupled to control switching of a power switch of the power converter to regulate an output of the power converter. The switching block is further coupled to control the switching of the power switch in response to the digital count signal. | 03-25-2010 |
| 20100091531 | METHODS AND SYSTEMS FOR REDUCING POWER CONSUMPTION - Methods and systems for managing power are described. In one embodiment of a method, a DC input voltage from an AC mains to DC converter, inputted to a DC to DC converter, is adjusted lower while maintaining substantially constant DC output voltage from the DC to DC converter in order to improve power efficiency. | 04-15-2010 |
| 20100124083 | 3-PHASE POWER FACTOR CORRECTED AC TO DC FILTERED SWITCHING POWER SUPPLY - This invention relates to a power supply apparatus and method for converting three-phase delta AC power to DC power using EMI filters and PFC circuits to maintain balanced AC current loading and reduce radiated and conducted emissions. Overcurrent and temperature protection are also provided in conjunction with a novel optocoupler latch circuit for improving maintenance of the power supply. | 05-20-2010 |
| 20100195358 | VOLTAGE REGULATOR AND AC-DC CONVERTER - A voltage regulator is provided. An input node receives an input voltage. An output node provides a supply voltage. A first transistor is coupled between the input node and a node. A first resistor is coupled between the input node and a gate of the first transistor. A second transistor is coupled between the node and the output node. An amplifier includes a non-inverting input terminal for receiving a reference voltage and an inverting input terminal. A second resistor is coupled between the inverting input terminal and a ground. A third transistor is coupled between the second resistor and a gate of the second transistor, wherein the third transistor is controlled by an output of the amplifier. A fourth transistor is coupled between the third transistor and the first node, wherein a gate of the fourth transistor is coupled to the gate of the second transistor. | 08-05-2010 |
| 20100246222 | METHOD AND APPARATUS FOR DIGITAL CONTROL OF A SWITCHING REGULATOR - Various techniques directed to the digital control of a switching regulator are disclosed. In one aspect, a power supply regulator includes a compare circuit to be coupled to receive a feedback signal representative of an output level of a power supply. This causes a feedback state signal to be generated having a first feedback state that represents an output level of the power supply that is above a threshold level and a second feedback state that represents an output level of the power supply that is below the threshold level. An adjustment circuit is coupled to the compare circuit to adjust the feedback state signal in response to at least one of adjusting the threshold level or adjusting the feedback signal. The adjustment to the feedback state signal tends to cause the feedback state signal to revert from a state at the time of adjustment to a state immediately preceding the adjustment. A control circuit is to be coupled to a power switch and is to be coupled to receive an oscillating signal and the feedback state signal. The control circuit is to control switching of the power switch in response to the oscillating signal and the feedback state signal to regulate the output level of the power supply. | 09-30-2010 |
| 20100265743 | CONTACT-INPUT ARRANGEMENT FOR POWER SYSTEM DEVICES - A contact-input circuit for a power system device is described for processing a higher voltage signal from power system equipment or another power system device for use by a lower voltage circuit. The contact-input circuit generally includes a voltage threshold detection device adapted to allow current to flow therefrom when it detects that the higher voltage signal reaches a select threshold. An opto-isolator device, which is coupled to the voltage threshold detection device, provides a voltage signal suitable for use by the lower voltage circuit when the threshold detection device allows the current-flow through the opto-isolator. | 10-21-2010 |
| 20110038189 | CLOSED-LOOP EFFICIENCY MODULATION FOR USE IN AC POWERED APPLICATIONS - A system and method for closed-loop efficiency modulation for an AC/DC power system is provided. A boost-buck converter and a DC/DC converter connected in series receive a rectified DC feed signal from a AC input signal and deliver a modified DC output to an active load. A controller receives power data at various stages of the system and uses that data to modify a series of trim voltages provided to the feedback inputs of the respective converters to modify each converters output voltage. The controller modifies each converter's output voltage to maximize power efficiency while monitoring other data in the system to ensure the system is operating correctly and safely. | 02-17-2011 |
| 20110051477 | Front-end circuit of power converter - A front-end circuit of a power converter has a power connection wiring detecting circuit, a power switch and a control unit. The power connection wiring detecting circuit is connected to an AC power. The control unit is connected to the power connection wiring detecting circuit. The power switch is connected to the power loop. The control unit turns on or off the AC power loop through the power switch. When the power connection wiring is correctly connected with the AC power, the control unit turns on the power switch and the front-end circuit outputs the AC power to the back-end circuit. When the power connection wiring is incorrectly connected with the AC power, the control unit turns off the power switch and the AC power is not outputted to the back-end circuit. | 03-03-2011 |
| 20110235378 | POWER SUPPLY SYSTEM FOR ELECTRONIC DEVICE - A power supply system includes an AC power source, a converter, a relay switch, and a waveform monitoring circuit. The AC power source provides an AC voltage. The converter is capable of converting the AC voltage into a DC voltage. The relay switch is connected between the AC power source and the converter. The waveform monitoring circuit is connected to the AC power source, and monitors a waveform of the AC voltage provided by the AC power source. The waveform monitoring circuit is connected to the relay switch, and turns on the relay switch when an absolute value of an instantaneous voltage of the AC voltage is not bigger than a threshold voltage. | 09-29-2011 |
| 20110267856 | PFC WITH HIGH EFFICIENCY AT LOW LOAD - A Power Factor Corrector (PFC), typically used as the first stage of switched mode power supplies, particularly suited for Universal Mains inputs, is disclosed, along with methods for controlling a switched mode power supply having power factor correction. In order to increase efficiency, particularly under low load conditions, without undue degradation of the Power Factor, the switching of the PFC circuit is confined to one or more operating windows within each half-cycle. In embodiments, the operating window comprises a small time window centred around the peak of the mains voltage. The higher the power level, the wider the switching window. | 11-03-2011 |
| 20110280052 | MULTILEVEL ELECTRIC POWER CONVERTER - There is described a multilevel electric power converter circuit comprising: N | 11-17-2011 |
| 20110292699 | Systems and Methods for Distortion Reduction - Systems and devices for reduction of total harmonic distortion in power supply circuits are presented. Example embodiments of the disclosed systems of total harmonic distortion reduction reduce a low frequency output voltage ripple seen by the voltage control loop by adding a compensating ripple voltage to the output feedback signal. The compensating signal may be scaled by the user to optimize the degree of ripple reduction, and may be automatically adjusted by monitoring circuitry to scale with a power factor control circuit output power level. | 12-01-2011 |
| 20110317458 | SWITCHED-MODE POWER SUPPLY CONTROLLING CIRCUIT AND SWITCHED-MODE POWER SUPPLY USING THE SAME - A controlling circuit is provided for controlling an output voltage of a main circuit of a switched-mode power supply. The controlling circuit includes components that generate a switching status selecting signal reflecting a voltage change of the main circuit, and output a reference voltage according to a voltage output status selected according to the switching status selecting signal. Other components output a pulse width modulation controlling signal according to the reference voltage and a current signal reflecting a current change of the main circuit, and output a pulse frequency modulation controlling signal with a frequency according to a frequency output status selected according to the switching status selecting signal. Yet other components output a switching controlling signal according to the controlling signals, and control a switch of the main circuit to switch-on or switch off according to the switching controlling signal to stabilize the output voltage of the main circuit. | 12-29-2011 |
| 20120014149 | POWER CONVERSION APPARATUS AND METHOD - According to one embodiment a power conversion apparatus includes a first switch, a second switch, and a pulse generator. The first switch is connected at both ends of an AC power supply through an inductor and capacitor connected in series. The second switch is connected at both ends of the first switch through a smoothing capacitor connected in series. The pulse generator generates a first pulse signal for driving the first switch at a frequency higher than a cycle of the AC voltage, and supplies it to the first switch, when the polarity of the voltage of the AC power supply is positive. The pulse generator generates a second pulse signal for driving the second switch at a frequency higher than a cycle of the AC voltage, and supplies it to the second switch, when the polarity of the voltage of the AC power supply is negative. | 01-19-2012 |
| 20120026766 | CONTROL DEVICE OF A SWITCHING POWER SUPPLY - A control device controls a switching converter that converts an alternating supply voltage to a regulated voltage and comprises a switch connected to an inductor. The control device is adapted to control the on period and the off period of said switch for each cycle. The control device comprises a ramp generator adapted to generate a ramp voltage, a comparator adapted to determine the final instant of the on period of the switch by crossing the ramp voltage with a first voltage. The control device has a first signal representing a current through the inductor and a second signal representative of the current flowing through at least one element of the converter. The control device is adapted to control the closing of said switch according to said first signal and comprises a synchronizer adapted to synchronize the start of the ramp voltage with the zero crossing of said second signal. | 02-02-2012 |
| 20120063183 | POWER SUPPLY INPUT DEVICE - A power supply input device including a first resistance of a discharge resistance conversion unit connected in parallel to a discharge resistance unit; and a switching unit of the discharge resistance conversion unit connected to the first resistance and performing a switching operation according to an externally received control signal, thus minimizing power losses occurring when a system is in a standby mode. | 03-15-2012 |
| 20120092910 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply is provided to supply an AC input voltage. The supply includes a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and switch elements in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value. The control unit also operates the switching without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value. | 04-19-2012 |
| 20120099354 | CIRCUITS AND METHODS FOR ALTERNATING CURRENT-TO-DIRECT CURRENT CONVERSION - An AC-to-DC converter for converting an AC voltage to a DC voltage includes a first converter, a second converter, a sense circuit, a controller, and an enabling circuit. The first converter converts an AC voltage to a first DC voltage. The second converter converts the first DC voltage to a second DC voltage. The sense circuit coupled to the first and second converters provides a first sense signal indicative of the first DC voltage and a second sense signal indicative of the AC voltage. The controller coupled to the first and second converters controls the first and second DC voltages. The enabling circuit coupled to the sense circuit generates a control signal to the controller to disable both the first converter and the second converter by comparing the first sense signal to a first threshold voltage and comparing the second sense signal to a second threshold voltage. | 04-26-2012 |
| 20120106213 | THREE-PHASE RECTIFIER - A three-phase rectifier converts three-phase alternating current (AC) power supplied from a three-phase AC power supply into direct current (DC) power. The three-phase rectifier includes a full-wave rectifier circuit, a bidirectional switch circuit, and a controller. The full-wave rectifier circuit rectifies three-phase AC power to DC power. The bidirectional switch circuit switches on and off inputs of respective phases from the three-phase AC power supply to the full-wave rectifier circuit. The controller detects voltages of the respective phases of the three-phase AC power supply, generates switching patterns for the respective phases to switch the bidirectional switch circuit on and off based on the detected voltages of the phases, and controls switching of the bidirectional switch circuit based on the switching patterns. | 05-03-2012 |
| 20120155133 | DIRECT CURRENT/ DIRECT CURRENT CONVERTER FOR REDUCING SWITCHING LOSS, WIRELESS POWER RECEIVER INCLUDING DIRECT CURRENT/ DIRECT CURRENT CONVERTER - Provided are a direct current/direct current (DC/DC) converter and a wireless power receiver including the DC/DC converter. In one embodiment, a direct current-direct current (DC/DC) converter for use in a wireless power receiver, the DC/DC converter may include: a voltage converting unit configured to convert, DC voltage, to a predetermined DC voltage; a turn-on switch configured to control current flow of the DC voltage through the voltage converting unit; and a switching controller configured to: detect an amount of current of the voltage converting unit based on a first turn-on period of the turn-on switch, set a second turn-on period of the turn-on switch based on the detected amount of current, and control the turn-on switch based on the second turn-on period. | 06-21-2012 |
| 20120155134 | HIGH EFFICIENCY RECTIFIER, WIRELESS POWER RECEIVER INCLUDING THE RECTIFIER - A high efficiency rectifier and a wireless power receiver including the rectifier are provided. In one embodiment, a rectifier may be formed of a full bridge diode circuit and may include: a first dual diode, a second dual diode, a third dual diode and a fourth dual diode forming the full bridge diode circuit, the full bridge diode circuit including: a first path configured to output voltage when the phase of an input voltage is positive, via the first dual diode and the fourth dual diode; and a second path configured to output voltage when the phase of the input voltage is negative, via the second dual diode and the third dual diode. In another embodiment, a rectifier may include: at least two full bridge diode circuits connected in parallel. | 06-21-2012 |
| 20120163049 | APPARATUS FOR COLLECTING WIRELESS ENERGY AND WIRELESS ELECTRONIC LABEL EMPLOYING THE APPARATUS - An apparatus for collecting wireless is provided. The apparatus includes an antenna and a collection circuit. The antenna generates an alternating current (AC) voltage from a radio wave. The collection circuit generates a direct current (DC) voltage corresponding to the AC voltage, determines whether the DC voltage is lower than a preset value, and changes an internal impedance of the collection circuit if it is determined that the DC voltage is lower than the preset voltage. | 06-28-2012 |
| 20120201062 | STANDBY POWER CUT-OFF DEVICE AND CONTROL METHOD THEREOF AND POWER SUPPLY - The present invention is related to a standby power cut-off device that cuts off standby power generated from an electrical appliance by learning power on/off control data sent from a remote control, and upon receipt of the power on/off control data of the remote control, simultaneously controls commercial power (main power) supplied to the electrical appliance, and a control method thereof. | 08-09-2012 |
| 20120206947 | Load Detection for a Low Power Mode in an AC-DC Adapter - Various embodiments of the present invention relate to AC-DC adapters, and more particularly, to systems, devices and methods of employing a load detector to detect a load condition of the AC-DC adapters based on transient variation of a DC output voltage; and therefore, enable the AC-DC adapters to switch from a low power mode to a normal power mode. At the low power mode, a DC output voltage is generated at a target voltage by the AC-DC adapter, and subsequently drops at a decay rate dependent on load condition. The load detector is electrically coupled to monitor the output voltage and measure the decay time between two threshold voltages. An enable instruction is provided to configure the AC-DC adapter to the normal power mode as soon as the decay time is lower than the threshold decay time or the variation of consecutive decay times reaches a certain threshold. | 08-16-2012 |
| 20120218792 | DIGITAL PHASE ADJUSTMENT FOR MULTI-PHASE POWER CONVERTERS - A multiphase power converter includes one or both of a phase control circuit and a valley switching locking circuit. The phase control circuit measures a phase difference between a first phase circuit and a second phase circuit and varies an on-time of a drive switch of the second phase circuit to produce and maintain a predetermined phase difference between the first phase circuit and the second phase circuit. When the multiphase power converter is operating in a discontinuous mode of operation, the valley switching locking circuit counts the number of zero crossings of an input current of the first phase circuit and blocks a second zero crossing detection signal from a waveform generator (i.e., PWM driver) associated with the second phase circuit until an input current of the second phase circuit has as many zero crossings as that of the first phase circuit input current. | 08-30-2012 |
| 20120224401 | Variable Input Voltage PFC Circuits, Systems and Power Supplies With Phase Shifted Power Rails - A method of generating an output voltage from a variable input voltage with a power factor correction (PFC) system is disclosed. The PFC system includes a first power rail and a second power rail connected in parallel between an input for receiving the input voltage and an output for outputting the output voltage. The method includes operating one or both of the first power rail and the second power rail to generate the output based, at least in part, on whether the input voltage exceeds a threshold voltage. Power supplies and PFC systems suitable for performing the method are also disclosed. | 09-06-2012 |
| 20120257427 | ACTIVE RECTIFICATION OUTPUT CAPACITORS BALANCING ALGORITHM - An active rectification system includes an active rectifier that converts an alternating current (AC) input to a direct current (DC) output. The active rectifier includes a plurality of switching devices and at least a first output capacitor and a second output capacitor connected at the DC output of the active rectifier. A controller includes a DC output regulation portion and an output capacitor balancing portion, wherein the DC output regulation portion monitors the DC output and in response generates control signals for regulating the DC output to a desired value. The output capacitor balancing portion monitors first and second output capacitor voltages associated with the first and second output capacitors, respectively, and generates an accumulated adjustment value that modifies the control signals provided by the DC output regulation portion to balance the first and second output capacitor voltages. | 10-11-2012 |
| 20120262961 | Low cost high power factor LED driver - A controller for a power supply having a primary side and a secondary side includes a mapping circuit for generating a feedback signal corresponding to an output current of the secondary side, a power switch coupled to the primary side for conducting a connection according to a modulation signal, a constant current block, for generating a first current signal according to the feedback signal; and a control unit, for generating the modulation signal to control the power switch according to the first current signal. | 10-18-2012 |
| 20120275203 | AC-DC CONVERTER AND METHOD OF CONTROLLING SAME - To provide an AC-DC converter that is highly efficient in a broad load current range from a light load to a heavy load. | 11-01-2012 |
| 20120300517 | POWER FACTOR CORRECTOR WITH HIGH POWER FACTOR AT LOW LOAD OR HIGH MAINS VOLTAGE CONDITIONS - A power factor corrector raises power factor at low loads or high mains voltages by modifying the switch timing or the current received by the power converter. It achieves this by increasing the switch-on time of a control switch during the falling time so that the majority of the switch-on time during a mains period occurs during the falling time, to thereby control the current received by the converter to compensate for current received by the intermediate filter. Some embodiments may employ a feedback system to produce one or more error signals that modify the control signal used to control the operation of the converter. Various embodiments may also include additional stages that limit the compensation range of the error signal. | 11-29-2012 |
| 20130010508 | MAIN SUPPLY ZERO CROSSING DETECTION FOR PFC CONVERTER - A fault mode of a PWM module embedded in a microcontroller is used to detect main supply zero crossings for regulating output voltage of a PFC converter operating in BCM, without using an external detecting element or a comparator, ADC or other specialized component internal to the microcontroller. In some implementations, the end of decrease current flow in the energy storage inductor of the converter is used to reinitialize a PWM timer or counter (counting-up or counting-down timer). The current goes to zero for a time period when the main supply voltage goes to zero, resulting in the PWM timer or counter not being reinitialized prior to the end of the current PWM cycle. The failure to reinitialize the timer or counter can be used to generate a signal indicative of a zero voltage crossing of the main supply voltage. | 01-10-2013 |
| 20130044525 | ASYMMETRIC SWITCHING RECTIFIER - An asymmetric switching rectifier includes a first switching device to allow electric current to flow while in a first state and inhibit electric current in a second state and a second switching device connected in a head-to-head formation to said first switching device, said second switching to allow electric current to flow while in a first state and inhibit electric current in a second state. A first electric current to turn said switching devices to said first state is different than a second electric current to turn said switching devices to said second state. The rectifier further includes a bypass segment to draw a bypass electric current from a center electrode between said first switching device and said second switching device. | 02-21-2013 |
| 20130070495 | AC/DC CONVERTER - The present invention relates to an AC/DC converter comprising at least two phase legs connected in series between first and second DC connection terminals of the AC/DC converter, wherein each phase leg comprises: an AC connection having first and second terminals arranged to connect the phase leg to a phase of an AC system; a phase branch comprising at least one converter cell and having first and second branch end terminals; and a capacitor. The capacitor is connected the between the first branch end terminal and the first AC connection terminal, so that the capacitor forms a DC blocking capacitor. The second AC terminal is connected to the second branch end terminal. The series connection of the phase legs between first and second DC connection terminal is such that a first series connection point in a phase leg is located between the first branch end terminal and the capacitor, while a second series connection point is located between the second branch end terminal and the second AC connection. The invention further relates to a method of operating such AC/DC converter. | 03-21-2013 |
| 20130077364 | POWER CONVERTER AND THE METHOD THEREOF - The present disclosure discloses a power converter providing a low output voltage from an offline AC. The power converter defines a voltage window for the input AC signal. Inside the voltage window, the rectified DC waveform is passed through to the output and the storage capacitor; outside the voltage window, the power converter is idle (or the output is blocked from input) and let the output storage capacitor alone supply the load. | 03-28-2013 |
| 20130107591 | POWER-FACTOR-IMPROVING CIRCUIT AND METHOD FOR AN OFFLINE CONVERTER | 05-02-2013 |
| 20130121047 | ACTIVE POWER FACTOR CORRECTION CIRCUIT AND RELATED PFC CONTROLLER - An active power factor correction (PFC) circuit for calibrating a power factor of an AC-to-DC converter when the active PFC circuit is coupled with the AC-to-DC converter is disclosed including: a piecewise linear gain circuit, an error amplifier, a PWM controller, and a PWM signal generator. The piecewise linear gain circuit is for receiving a feed forward signal and generating a corresponding gain signal, wherein the gain signal and the feed forward signal have a broken line relation with respect to magnitude. The error amplifier is for generating an error signal according to an output voltage of the AC-to-DC converter. The PWM controller is for generating a control signal according to the gain signal and the error signal. The PWM signal generator is for generating a PWM signal for controlling a power switch of the AC-to-DC converter according to the control signal. | 05-16-2013 |
| 20130128637 | POWER RAIL REGULATOR SYSTEM - A power regulators system and method is disclosed. In one embodiment, a power regulator system ( | 05-23-2013 |
| 20130141954 | POWER SUPPLY CIRCUIT - A power supply circuit includes an alternating current to direct current (AC/DC) converter, an uninterruptible power supply (UPS), a protection circuit, and a power supply unit (PSU). The AC/DC converter converts AC power from the UPS to DC power and transmits the DC power to the PSU through the protection circuit. The protection circuit includes a first resistor, a first switch, a first capacitor, and a microprocessor. At the initial time when the UPS first supplies power to the UPS, the microprocessor turns off the first switch; after a preset time has elapsed, the microprocessor turns on the first switch. | 06-06-2013 |
| 20130163299 | POWER SUPPLY DEVICE SYSTEM, SWITCHING POWER SUPPLY DEVICE, CONTROL PARAMETER GENERATION DEVICE, AND PROGRAM - A power supply device system | 06-27-2013 |
| 20130170259 | METHOD AND APPARATUS FOR CONTROLLING THE EQUIVALENT RESISTANCE OF A CONVERTER - The disclosure provides a method for controlling an equivalent resistance of a converter. The method includes receiving a power source input signal, generating a first control signal according to a voltage level and a state of the power source input signal to adjust an equivalent resistance of the voltage conversion module and cause the voltage conversion module to operate in the damper mode or the converter mode, when the voltage conversion module operates in the converter mode converting the power source input signal to an output signal, and when the voltage conversion module operates in the damper mode detecting the voltage level or the current level of the power source input signal, and adjusting the equivalent resistance so that the voltage conversion module could operate in the bleeder mode or the converter mode to convert the power source input signal to the output signal. | 07-04-2013 |
| 20130182473 | AUTOMATIC VOLTAGE CONVERSION SYSTEM BASED ON A SINGLECHIP - The invention discloses an automatic voltage conversion system based on a singlechip, comprising a control unit, a power circuit unit, a transformer unit, a voltage sampling unit, an output protection unit and a voltage switching unit; wherein, the power circuit unit provides suitable working voltage for the whole circuit; the voltage sampling switching units are respectively connected to the control unit; the transformer unit is connected to the voltage switching unit; the output protection unit input is connected to the control unit, and output protection unit output is connected to the transformer unit; and the control unit, as a control system based on a singlechip, is used for controlling operation of both the voltage switching and output protection units after processing the signal gathered by the voltage sampling unit. The system can perform automatic voltage conversion, and high and low input voltage protection and provide transformer over temperature protection. | 07-18-2013 |
| 20130194842 | CONTROL DEVICE OF A SWITCHING POWER SUPPLY - A control device controls a switching converter. The converter has an input alternating supply voltage, a regulated direct voltage on the output terminal, and a switch connected to an inductor. The control device controls the closing and opening time period of said switch for each cycle and receives a first input signal representative of the current flowing through one element of the converter. The control device comprises a counter configured to count a time period, a comparator configured to compare said first input signal with a second signal, digital control block configured to control the closing and opening of said switch and to activate said counter to start the counting of said time period when the said first input signal crosses said second signal, with said switch being closed. The digital control block is configured to open the switch when the counter finishes the counting of said time period. | 08-01-2013 |
| 20130194843 | AC/DC LOW VOLTAGE POWER SUPPLY DEVICE AND METHOD OF STEPPING DOWN AC/DC VOLTAGE - An alternating current/direct current (AC/DC) power supply device includes a stepping down unit for stepping down voltage provided by an electric power source, wherein the power source provides a voltage up to but not exceeding a predetermined value. The stepping down unit includes a switch for connecting or disconnecting an energy storage device or a load device to an AC electrical source. | 08-01-2013 |
| 20130201738 | POWER FACTOR CONTROL OF A CYCLO-CONVERTER - A three-phase resonant cyclo-converter comprising a power control module, wherein the power control module is arranged to develop a plurality of repeating switching periods within a cycle, the power control module further arranged to: control the length of a first switching period in the cycle to adjust the power flow, and control the relative length of two or more further switching periods in the cycle to adjust the power factor, wherein the relative length is controlled based on a cross-product of voltage and current values associated with the further switching periods. | 08-08-2013 |
| 20130208520 | SWITCHING REGULATOR, CONTROL METHOD THEREOF AND POWER-SUPPLY DEVICE - A switching regulator configured to convert an input voltage input to an input terminal into a predetermined constant voltage by switching with at least two elements including a pair of switching elements or a switching element and a rectifying element, and output the converted voltage as an output voltage from an output terminal includes a comparison unit configured to compare a signal showing an oscillating frequency of the switching regulator with a signal showing a constant frequency, and a driver configured to delay a pulse signal generated by feeding-back a control signal and an output signal of the switching regulator according to the comparison result by the comparison unit with a predetermined time, and switch the input voltage by using the at least two elements based on the pulse signal after the delay. | 08-15-2013 |
| 20130223117 | POWER SUPPLY SYSTEM - The invention provides a power supply system that is capable of converting a variable AC voltage to a regulated DC voltage that is configured to be supplied to an associated device. The power supply system includes an AC input load, a rectifier circuit and a voltage limiting circuit. Further the AC input load is coupled in series with the rectifier circuit and the rectifier circuit's output is coupled to the voltage limiting circuit. | 08-29-2013 |
| 20130223118 | System and Method for Reducing an Input Current Ripple in a Boost Converter - A device comprises a first power cell, a second power cell, a power factor correction module, a boost inductor switch circuit, and an output. The first and second power cells are configured to provide first and second currents in response to an input voltage. The power factor correction module is configured to continuously activate and deactivate the first and second power cells based on an input current level, on the input voltage, and on an output voltage. The boost inductor switch circuit is configured to disable the first power cell in response to the input current level being below a predetermined level. The output is configured to provide the output voltage based on the first and second currents when the input current level is above the predetermined level, and to provide the output voltage based on the second current when the input current level is below the predetermined level. | 08-29-2013 |
| 20130242629 | ON-TIME COMPENSATION FOR SWITCHING POWER CONVERTERS - An improved discontinuous current mode (DCM) switching power converter that compensates for the effect of dead time. The dead time of the switching power converter is measured during a switching cycle and a baseline on-time for a switch of the switching power converter is determined. The dead time and baseline on-time are used in calculating the desired on-time of the switch during a subsequent switching cycle of the power converter. The desired switch on-time regulates the output voltage to a desired voltage level. The desired switch on-time also maintains the average input current to the power converter in proportion to the input voltage, thereby improving the power factor of the switching power. | 09-19-2013 |
| 20130272041 | ELECTRICAL DEVICE WITH LOW VOLTAGE OUTPUT AND LOW VOLTAGE TOUCH PANEL - Electrical devices are described. In one embodiment, an electrical device suitable for installation in an electrical gang/patress box includes an alternating current (AC) to direct current (DC) transformer configured to transform an AC power signal that is accessible from within the electrical gang/patress box into a DC power signal, a load regulator module configured to regulate a load device in response to the DC power signal, a microcontroller module configured to control the load regulator module in response to the DC power signal, and a connector configured to output a DC voltage signal having a voltage that is lower than the voltage of the AC power signal in response to the DC power signal. Other embodiments are also described. | 10-17-2013 |
| 20130279223 | SENSING AND CONTROL FOR IMPROVING SWITCHED POWER SUPPLIES - A power converter and a method of operation thereof is disclosed including an input, an output, a sensor unit, a switched power converter, and a processor module. The power converter may convert an input power into an output power. The power converter may sense real-time measurements of the input power and the output power to determine a real-time calculated efficiency. The power converter may chop the input power into sized and positioned portions of the input power based on a plurality of determined operating parameters. The power converter may determine the operating parameters based on the real-time calculated efficiency and on a plurality of other operating factors/conditions. | 10-24-2013 |
| 20130294124 | POWER CONVERSION DEVICE - Aspects of the invention include a step-up/step-down chopper unit, an inverter unit, a rectifier unit, first to third voltage detection means, and a drive control unit. Voltage regulation means of the drive control unit, in accordance with a detected voltage value detected by the voltage detection means, generates control signals for keeping the effective voltage value of a capacitor constant. In some aspects of the invention, the effective voltage value of the capacitor is controlled to be constant by the switching elements of the step-up/step-down chopper unit and inverter unit being driven by the control signals. The rectifier unit can suppress a surge voltage by causing energy stored in a inductor to be absorbed by storage elements when bidirectional switching elements are turned off. | 11-07-2013 |
| 20130308358 | POWER CONVERSION APPARATUS - According to one embodiment, a controller determines the polarity of the input voltage detected by an input voltage detector. Then, when the polarity of the input voltage is positive, the first switch is subject to pulse driving, and when the polarity of the input voltage is negative, the second switch is subject to pulse driving, where the pulse driving is carried out at an on/off timing determined on the basis of the respective detection outputs of an input voltage detector, an input current detector, an output voltage detector, and an output current detector. | 11-21-2013 |
| 20130314959 | CONTROL ARRANGEMENT AND METHOD FOR REGULATING THE OUTPUT VOLTAGE OF A DC SOURCE POWER CONVERTER CONNECTED TO A MULTI-SOURCE DC SYSTEM - A converter control arrangement for regulating the output voltage of a dc source power converter connecting an ac system to a HVDC system to enable dc electrical power to be supplied from the ac system to the HVDC system comprises a dynamic droop control device including first and second droop controllers in which the droop rate of the second droop controller is greater than the droop rate of the first droop controller. The converter control arrangement comprises a voltage regulator for regulating the output voltage of the dc source power converter by comparing an output voltage value with a target voltage value derived by combining a reference voltage value and a droop voltage value provided by the dynamic droop control device. The reference current value is the desired output current value of the dc source power converter and defines, in combination with the reference voltage value, a target operating point. | 11-28-2013 |
| 20130322139 | INPUT AC VOLTAGE CONTROL BI-DIRECTIONAL POWER CONVERTERS - A family of power converters has input ac voltage regulation instead of output dc voltage regulation. The bi-directional converters control power flows and maintain the input ac voltage at or close to a certain reference value. These bi-directional power converters handle both active and reactive power while maintaining the input ac voltage within a small tolerance. Use of these converters is favorable for future power grid maintenance in that they (i) ensure the load demand follows power generation and (ii) provide distributed stability support for the power grid. The converters can be used in future smart loads that help stabilize the power grid. | 12-05-2013 |
| 20140003104 | ACTIVE RECTIFICATION WITH CURRENT-SENSE CONTROL | 01-02-2014 |
| 20140003105 | POWER FACTOR CORRECTION CIRCUIT, THE CONTROL CIRCUIT AND THE METHOD THEREOF | 01-02-2014 |
| 20140022829 | Hybrid Adaptive Power Factor Correction Schemes For Switching Power Converters - The embodiments disclosed herein describe a method of a controller of a switching power converter that provides a configurable power factor control method for the switching power converter. In one embodiment, the controller combines power regulation control methods of constant on-time control and constant power control to adjust the power factor of the switching power converter. | 01-23-2014 |
| 20140036559 | POWER SUPPLY MONITORING CIRCUIT, AC/DC CONVERSION APPARATUS AND CONTROL METHOD OF POWER SUPPLY MONITORING CIRCUIT - There is provided a power supply monitoring circuit including a holding part holding, every time a local maximum value of a power supply voltage which fluctuates is detected, the local maximum value as a local maximum voltage value, a power stop detector detecting whether or not supply of the power supply voltage is stopped based on whether or not a state that a value of the power supply voltage is smaller than a first reference value according to the local maximum voltage value continues longer than a predetermined period, and a reference value controller decreasing the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected. | 02-06-2014 |
| 20140043877 | POWER FACTOR CORRECTION CONVERTER - A power factor correction converter includes: a light load detection circuit configured to generate, if supplied power to a load is less than or equal to a predetermined value, a light load detection signal whose level corresponds to the supplied power; a target waveform generation circuit configured to generate, based on an input DC voltage, a target waveform of an inductor current flowing through an inductor; and a drive signal generation circuit configured to generate a drive signal driving a switch such that the inductor current follows the target waveform. The target waveform generation circuit is configured to generate, if the light load detection signal indicates a light load, the target waveform that includes a zero level period in which an amplitude of the target waveform is zero level, the zero level period being adjusted in accordance with the level of the light load detection signal. | 02-13-2014 |
| 20140056043 | POWER GENERATOR, AND ELECTRIC EQUIPMENT USING IT - A power generator includes a power generating device that generates a power by receiving vibration, and a power converter that converts the output of the power generating device. The power generating device outputs powers through a first system and a second system. The power converter is driven by receiving the output of the second system from the power generating device, and converts the output of the first system from the power generating device into another power. | 02-27-2014 |
| 20140071723 | USING POWER FACTOR CONTROL TO OPTIMIZE POWER GENERATION AND ALLOCATION - The disclosed technology performs power factor correction involving rectifying and adjusting an input power supply signal with a PWM signal. The PWM signal is generated based on a closed feedback signal obtained from a load, as well as adjusted harmonic content retrieved from a sensed input power supply signal. The adjusted harmonic content is produced by extracting a fundamental signal and a plurality of harmonic signals from the sensed input power supply signal, modifying the plurality of harmonic signals by dividing by the fundamental signal, and combining the modified harmonic signals into a duty factor distortion signal. The duty factor distortion signal controls a duty factor of the PWM signal to provide a substantially square wave template. Furthermore, the power factor is increased by forcing the input power supply signal to follow the substantially square wave template. | 03-13-2014 |
| 20140160815 | POWER FACTOR CORRECTION CIRCUIT - There is provided a power factor correction circuit including: a main switching unit including a first main switch and a second main switch performing a switching operation to regulate a phase difference between a current and a voltage of input power, respectively; a main inductor unit including a first main inductor and a second main inductor accumulating or discharging energy according to a switching operation of each of the first main switch and the second main switch; a snubber switching unit including a first snubber switch and a second snubber switch providing zero-voltage turn-on conditions to the first main switch and the second main switch, respectively; and a controller controlling a switching operation of the main switching unit and the snubber switching unit. | 06-12-2014 |
| 20140160816 | POWER FACTOR CORRECTION CIRCUIT AND POWER SUPPLY INCLUDING THE SAME - There are provided a power factor correction circuit and a power supply including the same, the power factor correction circuit including a main switch adjusting a phase difference between a current and a voltage of input power, a main inductor storing or discharging the power according to switching of the main switch, a snubber circuit unit including a snubber switch forming a transfer path for surplus power present before the main switch is turned on and a snubber inductor adjusting an amount of a current applied to the snubber switch, and a reduction circuit unit reducing excessive power imposed on the snubber switch by varying inductance of the snubber inductor. | 06-12-2014 |
| 20140160817 | POWER FACTOR CORRECTION CIRCUIT AND POWER SUPPLY INCLUDING THE SAME - There are provided a power factor correction circuit, and a power supply including the same, the power factor correction circuit including a main switch adjusting a phase difference between a current and a voltage of input power, a main inductor storing or discharging the power according to switching of the main switch, a snubber circuit unit including a snubber switch forming a transfer path for surplus power present before the main switch is turned on and a snubber inductor adjusting an amount of a current applied to the snubber switch, and a reduction circuit unit including an auxiliary inductor inductively coupled to the snubber inductor and an auxiliary resistor consuming power induced from the snubber inductor through the auxiliary inductor. | 06-12-2014 |
| 20140169049 | Controller for a Power Converter and Method of Operating the Same - A controller for a power converter and method of operating the same. In one embodiment, the controller includes a current-sense device couplable in series with switched terminals of power switches of interleaved switching regulators and configured to produce a current-sense signal. The controller also includes an error amplifier configured to produce an error signal as a function of a characteristic of the power converter. The controller also includes a duty-cycle controller configured to sample the current-sense signal at mid-points of duty cycles of the power switches and regulate the characteristic as a function of the error signal and the current-sense signal. | 06-19-2014 |
| 20140177301 | POWER MODULE AND DISTRIBUTED POWER SUPPLY APPARATUS - There are provided a power module in which a bias voltage is varied and supplied to a control circuit controlling power conversion when an idle mode is switched to a normal mode, and a distributed power supply apparatus having the same. The power module includes: a power factor correction stage; a DC/DC conversion stage switching power to convert the power into pre-set DC power in a powering mode in which normal power is output; a standby stage converting the power into pre-set standby power in a cold standby mode in which the DC/DC conversion stage outputs power having a level lower than that of normal power; and a variable bias supply unit varying a voltage level of bias power for controlling DC/DC power conversion and supplying the same to the DC/DC conversion stage in the cold standby mode and the powering mode. | 06-26-2014 |
| 20140185342 | ELECTRICAL SUPPLY APPARATUS WITH CURRENT WAVEFORM SIGNAL AND METHOD FOR OPERATING THE ELECTRICAL SUPPLY APPARATUS - The object of the present invention is to provide an electrical supply apparatus which keeps the loading of the supply system low. | 07-03-2014 |
| 20140204638 | POWER SUPPLY APPARATUS WITH LOW POWER IN STANDBY MODE - Provided is a power supply apparatus with low power in a standby mode. The apparatus includes a voltage multiplier configured to multiply an input voltage and including a first terminal through which the multiplied voltage is output and a second terminal through which a voltage lower than a voltage of the first terminal is output; a main switch-mode power supply (SMPS) configured to receive the voltage of the first terminal of the voltage multiplier; and a standby SMPS configured to receive a voltage of the second terminal of the voltage multiplier. | 07-24-2014 |
| 20140211526 | Active Power Factor Corrector Circuit - In accordance with an embodiment, an electronic device includes a controller configured to apply slope compensation to a reference signal in a power factor corrector. The device also configured to adjust the slope compensation based on an input voltage of the power factor corrector. | 07-31-2014 |
| 20140218983 | ADDITIONAL ELECTRIC POWER RECEIVING METHOD AND DEVICE REPLACING CONVENTIONAL GROUNDING WITH NEGATIVE VOLTAGE SOURCE - An additional electric power receiving method replacing conventional grounding with a negative voltage source includes the step of transmitting electromagnetic wave or current from a power supply source to a rectifier, wherein a grounding end of the rectifier is in electrical communication with the negative voltage source, and the negative voltage source is selected from a negative potential intrinsic of an organism. A device applicable to the electric power receiving method includes a rectifier having an input end and two output ends, wherein the input end is in electrical communication with a power supply source, and rectified direct current is transmitted from the output ends. With the method and device, not only an increase in additional electric power obtained is achieved, but conversion efficiency and stability of current and electromagnetic wave is enhanced. | 08-07-2014 |
| 20140241019 | MULTI-LEVEL RECTIFIERS - Multi-level rectifiers are provided. A multi-level rectifier may convert a medium AC voltage to a medium DC voltage. A multi-level rectifier may comprise an input inductor, a set of diodes, a set of switches, and a DC link comprising a set of capacitors. One end of the input inductor is coupled to the input AC voltage and the other end of the input inductor is coupled to a pair of diodes that are series connected. The set of switches may be regulated such that the inductor may be coupled to a DC voltage point of the DC link. A multi-level rectifier may operate under a set of operation modes. Each operation mode may be determined from the input voltage and the inductor current. Accordingly, a sinusoidal voltage at the fundamental frequency of the input voltage may be synthesized by selectively switching between adjacent operation modes of the set of operation modes. A multi-level rectifier may be used in connection with a medium voltage to low voltage DC/DC converter to form a power conversion system that converts a medium AC voltage to a low DC voltage. | 08-28-2014 |
| 20140376290 | ALTERNATING CURRENT-TO-DIRECT CURRENT CIRCUIT - An AC to DC circuit includes a rectifier circuit, a voltage detecting circuit, the current source and the output circuit. The rectifier circuit converts the AC power to pulsating DC. The constant current source provides current to the voltage detection circuit and to the control port of the output circuit. The current passing throughout the constant current source is the sum of the current flowing to the voltage detection circuit and to the output circuit. The voltage detection circuit increases with the instantaneous value of the output voltage of the rectifier circuit, it absorbs more current from the current provided by the constant current source and less current flows from the constant current source to the control port of the output circuit. The output circuit amplifies the current of the control port and outputs it to power the load. The AC to DC circuit of the present invention can rectify the portion of an alternating input voltage below a sine peak of the alternating current, working at a sine wave ascending area and a sine wave descending area, and it can carry a capacitive load. | 12-25-2014 |
| 20150016164 | HIGH-VOLTAGE POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS - The high-voltage power supply apparatus includes an inductor to be applied with a voltage when a driving unit is driven by a drive signal at a predetermined frequency, a rectification unit connected to both ends of the inductor, the rectification unit including multiple capacitors and multiple diodes, a current detection unit configured to detect a current flowing through the rectification unit, and a control unit configured to control a duty of the drive signal based on a result of detection by the current detection unit. | 01-15-2015 |
| 20150029768 | Non-isolated AC to DC power device - An AC to DC power supply is provided based on feedback control of an analog current blocking (ACB) device. The ACB element receives rectified high voltage AC. The output of the ACB element is provided to an integrating circuit that provides an output DC voltage. The output DC voltage depends on the average current passed by the ACB element. The average current passed by the ACB element depends on the current limit of the ACB element, which is under feedback control. | 01-29-2015 |
| 20150049528 | METHOD FOR OPERATING A NON-ISOLATED SWITCHING CONVERTER HAVING SYNCHRONOUS RECTIFICATION CAPABILITY SUITABLE FOR POWER FACTOR CORRECTION APPLICATIONS - A power factor correction (PFC) boost circuit. The PFC boost circuit can include a first switching device, a second switching device, a first gate driver coupled to the first switching device, a second gate driver coupled to the second switching device, and a PFC controller configured to control the first and second gate drivers. The PFC controller will utilize a new technique, referred to herein as “predictive diode emulation” to control the switching devices in a desired manner and to overcome inefficiencies and other problems that might arise using traditional diode emulation. The PFC controller is configured to operate in synchronous and non-synchronous modes. | 02-19-2015 |
| 20150070953 | WAVEFORM SHAPE DISCRIMINATOR - A waveform shape discriminator includes a running maximum finder circuit coupled to receive a sense signal. The running maximum finder circuit is coupled to update a running maximum signal in response to the sense signal. A first comparator is coupled to receive the sense signal and a running maximum threshold signal that is representative of the running maximum signal. A search window block is coupled to receive the input signal to detect a search window in the sense signal. An output circuit is coupled to an output of the first comparator and an output of the search window block to determine a presence of a waveform shape in the sense signal within the search window in the sense signal. | 03-12-2015 |
| 20150138856 | POWER FACTOR CORRECTION AUTODETECT - A power supply system includes an Offline Total Power Management Integrated Circuit (OTPMIC). The OTPMIC controls a Power Factor Correction (PFC) converter, a main AC/DC converter, and a standby AC/DC converter. A PFC Autodetect circuit in the OTPMIC monitors current flow in the PFC converter. If a high power condition is detected, then the PFC Autodetect circuit enables the PFC converter. The high power condition may be a voltage drop across a current sense resistor of a predetermined voltage for a predetermined time, within one half period of the incoming AC supply voltage. If a low power condition is detected, then the PFC Autodetect circuit disables the PFC converter. The PFC Autodetect circuit stores an IMON value that determines the predetermined voltage, and a TMON value that determines the predetermined time. The IMON and TMON values are loaded into the Autodetect circuit across an optocoupler link of the standby converter. | 05-21-2015 |
| 20150146460 | POWER FACTOR CORRECTION APPARATUS WITH VARIABLE CAPACITANCE - A power factor correction apparatus ( | 05-28-2015 |
| 20150303788 | SOFT-SWITCHING LOW INPUT/OUTPUT CURRENT-RIPPLE POWER INVERSION AND RECTIFICATION CIRCUITS - A soft-switching and low input current ripple power inversion circuit, in which the inversion circuit is connected in parallel to an input DC voltage source and includes a top cell, a bottom cell and at least one transformer, in which the top cell and the bottom cell have its individual impedance adjusting unit of which the impedance can easily be adjusted to obtain the required equivalent resonant inductance or capacitance. Thus, the semiconducting switches therein can be soft-switched alternately to reduce the switching loss. Moreover, the inversion circuit can be modified by adding at least one middle cell inserted between the top cell and the bottom cell to reduce the voltage stress on the semiconductor switch. Consequently, low voltage rating semiconductor switch accompanied with lower RDS(on), conduction losses can be reduced to improve the converter efficiency. | 10-22-2015 |
| 20150303822 | METHOD FOR CONVERTING ALTERNATING CURRENT INTO DIRECT CURRENT AND RELATED DEVICE - The invention relates to a method for converting alternating current into direct current implemented by a conversion device that comprises a three-phase bridge in which at least one arm is comprised of a first switch and of a second switch mounted in series, with the method comprising a step of regulating the direct voltage output by the conversion device, characterised in that it comprises a transition step which precedes the regulation step, with the transition step comprising the formation of signals for controlling first and second switches capable of limiting the amplitude of the inrush currents when switching the conversion device to the alternative network. | 10-22-2015 |
| 20150326139 | CONGRUENT POWER AND TIMING SIGNALS FOR DEVICE - Congruent power and timing signals in a single electronic device. In an embodiment, a circuit may include just one isolation transformer operable to generate a power signal and a timing signal. On the secondary side, two branches may extract both a power signal and a clock signal for use in the circuit on the isolated secondary side. The first branch may be coupled to the transformer and operable to manipulate the signal into a power signal, such as a 5V DC signal. Likewise, the second circuit branch is operable to manipulate the signal into a clock signal, such as a 5 V signal with a frequency of 1 MHz. By extracting both a power supply signal and a clock signal from the same isolation transformer on the secondary side, valuable space may be saved on an integrated circuit device with only having a single winding for a single isolation transformer. | 11-12-2015 |
| 20150340962 | FIVE-LEVEL RECTIFIER - A five-level rectifier includes at least one phase bridge arm that includes an upper-half and a lower-half bridge arm circuit modules. The upper-half bridge arm circuit module includes a first power semiconductor switch unit, a second power semiconductor switch unit, a first diode unit, a second diode unit, a first connecting busbar, a first insulated wire and a first transfer busbar; the lower-half bridge arm circuit module includes a third power semiconductor switch unit, a fourth power semiconductor switch unit, a third diode unit, a fourth diode unit, a second connecting busbar, a second insulated wire and a second transfer busbar. The two modules are disposed side by side and facing each other. | 11-26-2015 |
| 20150349657 | FULLY VARIABLE POWER SUPPLY CONTROLLER - A fully variable controller allows wide range of output voltages and output currents to be programmed therein. In this manner, a power supply including the fully variable controller can power a wide range of electrical loads having distinct voltage and current requirements. The fully variable controller includes a control unit, a voltage regulator and a current regulator configured, respectively, to provide and maintain voltage and current according to an output voltage and output current programmed into the fully variable controller. | 12-03-2015 |
| 20150349658 | REGULATED AC-DC HYBRID RECTIFIER - A regulated hybrid AC-DC rectifier employing a boost stage is disclosed herein. The regulated hybrid AC-DC rectifier comprises a 12 pulse inductive current splitter/merger (CSM) system coupled to a boost stage. The boost stage may be regulated using a PWM controller. The regulated hybrid AC-DC rectifier may further include a three phase input filter configured to regulate the harmonic content of the AC-DC hybrid converter within a desired limit. The regulated hybrid AC-DC rectifier may further comprise a notch filter system configured to tune out harmonic ripples at known intervals, such as 11 | 12-03-2015 |
| 20150357911 | POWER CONVERSION SYSTEM OF MULTI-PHASE GENERATOR AND METHOD OF OPERATING THE SAME - A power conversion system of a multi-phase generator used to provide a power factor correction for a multi-phase generator. The power conversion system of the multi-phase generator includes a multi-phase power conversion unit and a control unit. The multi-phase power conversion unit receives a plurality of generator voltages and a plurality of generator currents generated from the multi-phase generator, and converts the generator voltages into a DC voltage and a DC current. The control unit controls the generator currents to linearly follow the generator voltages, therefore the power factor correction for the multi-phase generator is achieved. | 12-10-2015 |
| 20150364988 | PFC CONTROL CIRCUIT, DIGITAL PFC CIRCUIT AND THE METHOD THEREOF - A digital PFC circuit with improved power factor is described. The digital PFC circuit uses a compensation current generating unit and a reference current adjust unit to eliminate the effect of a current flowing through an input capacitor to the input current, so that the input current and the input line voltage of the digital PFC circuit are controlled to be in-phase. | 12-17-2015 |
| 20160006362 | Non-isolated AC to DC power device having gain stabilization - An AC to DC power supply is provided based on feed back control of an analog current blocking (ACB) device. The ACB element receives rectified high voltage AC. The output of the ACB element is provided to an integrating circuit that provides an output DC voltage. The output DC voltage depends on the average current passed by the ACB element. The average current passed by the ACB element depends on the current limit of the ACB element, which is under feed back control. Gain stabilization can be employed to accommodate a wide range of input voltages (e.g., for worldwide use). | 01-07-2016 |
| 20160043655 | Control System And Method For Controlling A Rectifier - A system and method for controlling a rectifier due to changing operating conditions including at least one reactor per phase connected to the rectifier for providing an input signal, a bias current for controlling the reactor, and a control current for controlling the reactor. The bias current is fixed to a predefined value which is taken as an input signal for providing a control current compensating the difference between the predefined value of the bias current and a start value defining a start point of the linear operating range of the reactor. | 02-11-2016 |
| 20160049882 | RESONANT CONVERTER AND SYNCHRONOUS RECTIFICATION CONVERTER CIRCUIT THEREOF - The present invention provides a synchronous rectification converter circuit, including three transformer secondary-windings, three current transformer, a synchronous rectification switching unit, a diode rectification unit, and a control unit. Each of three current transformers includes a primary-winding and secondary-winding. The three transformer secondary-windings and the three current transformer primary-windings are alternately connected in series to form a first triangular structure. Three vertices of the first triangular structure are connected to the synchronous rectification switching unit. The three current transformer secondary-windings are connected in series to form a second triangular structure. Three vertices of the second triangular structure are connected to the diode rectification unit. The diode rectification unit is connected to the control unit and the synchronous rectification switching unit is connected to the control unit. The present invention achieves a purpose of precisely controlling the on-off state of the synchronous rectification circuit. | 02-18-2016 |
| 20160079880 | POWER SUPPLY APPARATUS WITH AUXILIARY BOOST CIRCUIT - A power supply apparatus includes a rectification circuit, a power factor correction circuit, an auxiliary boost circuit and a direct current to direct current conversion circuit. The auxiliary boost circuit includes an input contact, an output contact, a voltage detection unit, a control unit, a boost unit and a boost bypass unit. When a voltage value of a power factor correction power is not greater than a predetermined voltage value, the control unit is configured to turn off the boost bypass unit and turn on the boost unit, so that the boost unit boosts the power factor correction power and then the power factor correction power is sent to the direct current to direct current conversion circuit through the boost unit and the output contact. | 03-17-2016 |
| 20160141974 | POWER CONVERSION APPARATUS - According to one embodiment, a controller determines the polarity of the input voltage detected by an input voltage detector. Then, when the polarity of the input voltage is positive, the first switch is subject to pulse driving, and when the polarity of the input voltage is negative, the second switch is subject to pulse driving, where the pulse driving is carried out at an on/off timing determined on the basis of the respective detection outputs of an input voltage detector, an input current detector, an output voltage detector, and an output current detector. | 05-19-2016 |
| 20160181941 | COMMON ZERO VOLT REFERENCE AC / DC POWER SUPPLY WITH POSITIVE AND NEGATIVE RECTIFICATION AND METHOD OF OPERATION THEREOF | 06-23-2016 |
| 20160190912 | System and Method for Measuring Power in a Power Factor Converter - In accordance with an embodiment, a method of measuring an input power of a power factor converter (PFC) includes determining an average of a rectified voltage signal from an input of the PFC, determining an average of an inductor current of the PFC, and determining the input power by multiplying the average of the rectified voltage signal by the average of the inductor current. | 06-30-2016 |
| 20160190951 | Digital Frequency Selective Transformer-Rectifier Unit Ripple Fault Detection - A circuit for converting variable frequency generated AC electric power to DC electric power for use on loads comprises a transformer-rectifier unit to convert a generated AC electric power to DC electric power. A tap senses the converted DC power downstream of the transformer-rectifier unit with a filter, which passes a filtered signal to a control for detecting a fault on the transformer-rectifier unit by passing a higher-order harmonic of the generated AC power as the filtered signal. A tap senses an AC frequency of the generated AC power reaching the transformer-rectifier unit. The sensed AC frequency is utilized to tune the filter, such that the filter will pass the higher order harmonic, as the higher order harmonic varies with variation in the AC frequency. A power system is also disclosed. | 06-30-2016 |
| 20160190953 | CAPACITIVE POWER SUPPLY DEVICE FOR A CONTROL DEVICE OF AN ELECTRICAL SWITCHING APPARATUS - A capacitive power supply device for a control device of an electrical switching apparatus, including a power supply module that has two input terminals and a power supply voltage between the two terminals, and suitable for supplying a power supply current to a control member suitable for controlling the electrical switching apparatus when the power supply voltage is below a predetermined actuation threshold, the power supply module including a first capacitor connected at the input of voltage rectifying means, the control member being connected at the output of a rectifying block, wherein a second capacitor and a first switch, suitable for connecting the second capacitor based on a comparison of the power supply voltage to a capacitor switching threshold value. | 06-30-2016 |
| 20160380552 | INPUT VOLTAGE DETECTION CIRCUIT AND POWER SUPPLY INCLUDING THE SAME - Provided are an input voltage detection circuit and a power supply including the same. The power supply includes a rectifier circuit configured to generate a line input voltage by rectifying an alternating current (AC) input. The input voltage detection circuit which is applied to the power supply generates a peak sensing voltage that indicates a predetermined peak area defined around a peak of the line input voltage, generates a peak detection signal that indicates the peak of the line input voltage based on a center of the peak sensing voltage, and generates an input sensing voltage corresponding to the line input voltage by being synchronized with the peak detection signal. The power supply may control a switching period according to the input sensing voltage. | 12-29-2016 |
| 20180027618 | Method And Apparatus For Modulating Load By Means Of A Control Command Obtained By Varying The Conduction Angle Of AC Voltage | 01-25-2018 |
