Entries |
Document | Title | Date |
20080278982 | Power Factor Correction Boost Circuit - The invention relates to a power factor controller for use in a power factor correction circuit. The power factor controller comprises a first input (VinSense) for receiving an input voltage (Vin) of the power factor correction circuit, a second input (VoSense) for receiving an output voltage (Vout) of the power factor correction circuit, and a controllable current source (VCCI) having a control input coupled to the first input, and a current supply output coupled to the second input, wherein said controllable current source (VCCI) sources a current to the second input (VoSense) that is inversely proportional to the input voltage. | 11-13-2008 |
20080285318 | Power Factor Correction Circuit - A power factor correction circuit having an input current for reducing the distortion and harmonics generated in a power line feeding power supply comprising:
| 11-20-2008 |
20080298102 | Power Converter With Low Loss Switching - A welding power supply includes an input rectifier that receives sinusoidal or alternating line voltage and provides a rectified voltage. A pre-regulator provides a dc bus and a convertor, such as a boost convertor, provides a welding output. The pre-regulator is an SVT (slow voltage transition) and an SCT (slow current transition) switched convertor. It may include a snubber circuit having a diode that is SVT switched. Also, the boost convertor may be SVT and SCT switched. The pre-regulator preferably includes a power factor correction circuit. The power source includes, in one embodiment, an inverter having a snubber circuit having a first switch in anti-parallel with a first diode, and a second switch in anti-parallel with a second diode. The first switch and first diode are connected in series with the second switch and the second diode, and the first and second switches are connected in opposing directions, to form a switched snubber. | 12-04-2008 |
20080298103 | FOUR POLE NEUTRAL-POINT CLAMPED THREE PHASE CONVERTER WITH LOW COMMON MODE VOLTAGE OUTPUT - A four pole, three-phase, NPC converter that produces virtually no common mode voltage. The low common mode voltage output is achieved by constraining the switch states of the NPC converter. A fourth pole and associated control balance the upper and lower DC link voltages. The converter may be an inverter or a rectifier. | 12-04-2008 |
20080304299 | Low voltage LED drive from 120VAC line - A highly efficient DC power supply is converted directly off-line from an A.C. or DC voltage source to have output current or voltage regulation from a low level approaching zero, up to the level of maximum capacity and has a DC power supply voltage and a DC voltage source for operating integrated circuits that is independent of output voltage or current. The DC power supply voltage is connected to a transformer input and switched “Off” and “On” in a pulse width modulated mode at a frequency rate above 1000 Hz and has the transformer output filtered through “buck” stage, so as to permit pulse width control to as much as 90% “on-time”, without damage to circuit components or load. | 12-11-2008 |
20090016087 | Switching power source - An error voltage Verr, as amplified by an amplifier, and an input voltage Vin, are multiplied together by a multiplier to generate a first threshold value signal Vth | 01-15-2009 |
20090040800 | Three phase rectifier and rectification method - A method for converting a three-phase AC voltage to a regulated DC voltage using a three-phase rectifier is disclosed. Both the positive and negative DC currents are controlled, but the inner phase is not controlled. In one embodiment, the AC to DC converter utilizes a three-phase rectifier with low-speed diodes, three low-speed bidirectional switches, two high-speed diodes, two high-speed unidirectional switches, three inductors on the AC side, and two capacitors connected in series. | 02-12-2009 |
20090103337 | METHOD AND APPARATUS TO REDUCE THE VOLUME REQUIRED FOR BULK CAPACITANCE IN A POWER SUPPLY - A driver circuit included in a power supply having a rectifier coupled to a single phase AC input voltage is disclosed. An example driver circuit includes a drive signal generator to generate a drive signal to be coupled to a variable impedance element. A voltage sensor is coupled to the drive signal generator and is to be coupled to sense a voltage across a high voltage capacitance. The driver circuit is to be coupled to control the variable impedance element in response to the voltage sensor. A low voltage capacitance is allowed to receive current from the input if the sensed voltage is less than a second threshold value. The low voltage capacitance is prevented from receiving current from the input if the sensed voltage is greater than a first threshold value. | 04-23-2009 |
20090103338 | SWITCHING POWER SOURCE APPARATUS - A switching power source apparatus includes a switching element connected through a primary winding of a transformer to a voltage terminal of a DC input voltage, a rectifying-smoothing circuit to rectify and smooth a voltage induced by a secondary winding of the transformer and provide a DC output voltage, a control circuit for controlling ON/OFF of the switching element, and a delay circuit to generate a predetermined delay time. The control circuit detects the DC input voltage, starts a switching operation of the switching element if the DC input voltage has increased to or above a threshold value, and stops the switching operation of the switching element if the DC input voltage is lower than the threshold value and that a period during which the DC input voltage is continuously lower than the threshold value has reached the predetermined delay time. | 04-23-2009 |
20090109715 | SYNCHRONOUS RECTIFYING FOR SOFT SWITCHING POWER CONVERTERS - An synchronous rectifying apparatus or synchronous rectifying circuit of a soft switching power converter is provided to improve the efficiency. The integrated synchronous rectifying circuit includes: a power transistor connected from a transformer to the output of the power converter for rectifying; a controller having a latch circuit generates a drive signal to control the power transistor in response to a switching signal generated by a winding of the transformer in response to the switching of the transformer. The controller turns off the power transistor when the switching signal is lower than a low-threshold. The power transistor is turned on when the switching signal is higher than a high-threshold. Furthermore, a maximum-on-time circuit provided in the controller is applied to generate a maximum-on-time signal for limiting the maximum on time of the power transistor. | 04-30-2009 |
20090122582 | DIGITALLY CONTROLLED THREE-PHASE PFC RECTIFIER - A robust decoder generates an output state from input signals related to the line-voltage signals of a three-phase power system, using a segment identification method based on zero-crossings derived from line-voltage difference signals. The robust decoder includes a basic decoder that provides a current output state based on the input signals, a state table that provides a presumed previous state based on the current output state of the basic decoder, a binary feed back loop including a state element for storing a previous output state, and a selector for providing the output state based on the stored previous output state and the presumed previous state. The robust decoder may be implemented as hardware or software in a digital power converter. Such a digital power converter may include boost inductors each receiving an input line voltage signal from the three-phase power system to provide phase voltage signals, switches receiving the phase voltage signals to provide an intermediate voltage signal, the plurality of switches each being control by a driving signal, an output circuit coupled to the intermediate voltage signal to provide a rectified output voltage signal for digital power converter, and a digital control circuit receiving the input line voltages and the output voltage signal, the digital control circuit generating the driving signals to control the switches. The switches may be configured according to a state machine. | 05-14-2009 |
20090129131 | POWER GENERATOR FOR SPECTROMETRY - An RF power generator ( | 05-21-2009 |
20090135631 | Method and apparatus of providing synchronous rectifying and regulation for power converters - A synchronous regulation circuit is provided to improve the efficiency of the power converter. A primary-side switching circuit generates a synchronous signal and a switching signal. The switching signal is used for soft switching a transformer. A secondary-side switching circuit is coupled to the output of the power converter to generate a pulse signal in response to the synchronous signal and the output voltage of the power converter. The pulse signal is a differential signal generated for the rectifying and the regulation of the power converter. A synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on/off the power switch. The power switch is connected in between the transformer and the output of the power converter. Furthermore, a flyback switch is operated as a synchronous rectifier to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off of the power switch. The on time of flyback switch is programmable and correlated to the on time of the power switch. | 05-28-2009 |
20090135632 | STEP-DOWN SWITCHING REGULATOR CAPABLE OF PROVIDING HIGH-SPEED RESPONSE WITH COMPACT STRUCTURE - In a step-down switching regulator, a switching element is a high-voltage NMOS transistor, turned on and off based on a control signal generated by a controller, and charges an inductor with an input voltage input to an input terminal. A first drive circuit is a low-voltage MOS transistor and turns on and off the switching element based on the control signal. A voltage generator generates a predetermined first power supply voltage not greater than a withstand voltage of the low-voltage MOS transistor. A capacitor is connected in parallel with the first drive circuit and stores charge from the voltage generator to supply power to the first drive circuit. One end of the capacitor is connected to a junction node between the switching element and the inductor, and the other end of the capacitor is supplied with the first power supply voltage generated by the voltage generator. | 05-28-2009 |
20090141523 | Switching control circuit and AC/DC converter using the same - A switching control circuit for an AC/DC converter stops the switching of a switching device in a low-phase angle range of an AC power supply to prevent an improper recovery operation after a brownout is detected. | 06-04-2009 |
20090141524 | CONTROL DEVICE FOR POWER FACTOR CORRECTION DEVICE IN FORCED SWITCHING POWER SUPPLIES - Herein described is a control device of a device for the correction of the power factor in forced switching power supplies; said device for the correction of the power factor comprises a converter and said control device is coupled to the converter to obtain from an alternating input line voltage a regulated output voltage. The control device comprises generating means associated to a capacitor for generating a signal representative of the root-mean-square value of the alternating line voltage; the generating means are associated to means for discharging said capacitor. The control device comprises further means for discharging the capacitor suitable for discharging said capacitor when the signal representative of the root-mean-square value of the alternating line voltage goes below a given value. | 06-04-2009 |
20090161395 | HIGH OUTPUT CURRENT SPLIT PACKAGE A/C ADAPTER - A power adapter, including an AC input terminal, an AC-DC power converter, a DC-DC power converter, and an output terminal, wherein the AC-DC power converter and the DC-DC power converter are separate components, and wherein the power AC input terminal, AC-DC power converter, DC-DC power converter and the output terminal are connected sequentially via a plurality of cords. | 06-25-2009 |
20090168476 | BRIDGELESS POWER FACTOR CORRECTION CIRCUIT - There is provided a bridgeless power factor correction circuit that corrects a power factor by complementarily switching two switches according to phase of input power without using rectifier bridge diodes. A bridgeless power factor correction circuit according to an aspect of the invention may include: a switching unit having a plurality of switches and alternately switching input AC power; a stabilizing unit rectifying and smoothing the power switched by the switching unit; and a control unit controlling an alternate switching operation between the plurality of switches according to phases of the input power. | 07-02-2009 |
20090168477 | Power Switching System to Increase Induction Heating to a Load From Available AC Mains Power - In one aspect, the invention provides a power system for providing power to a load. In some embodiment, the system comprises: a rectifier configured to rectify an AC main signal to produce a rectified AC main signal; a zero cross detector configured to receive the AC main signal and to detect when the AC main signal equals zero; a switching device having (i) a first terminal connected to a first node, wherein a first output terminal of the rectifier is also connected to the first node and (ii) a second terminal connected to a second node; a tank circuit having (i) a first terminal coupled to a third node, wherein a second output terminal of the rectifier is also coupled to the third node and (ii) a second terminal coupled to the second node; a current and/or voltage detector connected to the second node; and a controller in communication with the current detector and zero cross detector and configured to turn on and off the switching device based on, at least in part, information received from the zero cross detector and the current and/or voltage detector. | 07-02-2009 |
20090190382 | POWER FACTOR CORRECTING CONVERTER - A power factor correcting converter includes a rectifier to rectify an AC voltage of an AC power source into a pulsating voltage, a voltage converter having a switching element, to convert the pulsating voltage into a predetermined DC voltage with the switching element being turned on/off according to a control signal, an smoothing circuit to smooth the control signal, and a control signal generator to generate the control signal and change a switching frequency of the control signal according to an output from the smoothing circuit. | 07-30-2009 |
20090213628 | OFFLINE SYNCHRONOUS RECTIFYING CIRCUIT WITH CURRENT TRANSFORMER FOR SOFT SWITCHING POWER CONVERTERS - A synchronous rectifying circuit of soft switching power converter is provided to improve the efficiency. The integrated synchronous rectifier includes a power transistor connected from a transformer to the output of the power converter for rectifying. A controller having a latch circuit generates a drive signal to control the power transistor in response to a switching-current signal. A current transformer generates the switching-current signal in response to the switching current of the transformer. The controller turns off the power transistor when the switching-current signal is lower than a second threshold. The power transistor is turned on once the switching-current signal is higher than a first threshold. Furthermore, a pulse-width detection circuit generates a pulse signal coupled to disable the drive signal and turn off the power transistor. | 08-27-2009 |
20090213629 | POWERING CIRCUIT OF AC-DC CONVERTER - A powering circuit of an AC-DC converter, for converting a high AC input voltage into a low DC output voltage to provide a load voltage in a stable DC bias range, includes a rectifier, a sensing circuit, a control switching circuit, and a voltage regulating capacitor. The rectifier has a primary side coupled to an AC power supply and a secondary side for outputting a DC power supply. The sensing circuit compares the AC input voltage with a preset reference voltage, and turns on a second switch in the control switching circuit when the AC input voltage is lower than the reference voltage, thereby providing a low DC output voltage. The control switching circuit sustains the DC output voltage in a stable DC bias range. Therefore, in addition to reducing the power consumption of the second switch, this circuit structure is simple and can achieve the purpose of circuit integration. | 08-27-2009 |
20090231894 | Power Converter and Driving Method Thereof - In a power converter, a primary coil receives an input voltage, and a switch includes a first electrode, a second electrode coupled to the primary coil, and a control electrode. An output unit includes a secondary coil, and outputs an output voltage. The primary coil and the secondary coil form a transformer, and the input voltage is converted to the output voltage by the transformer. A controller receives a sensing voltage corresponding to a switch current flowing between the first electrode and the second electrode of the switch, detects a valley point of a voltage between the first electrode and the second electrode of the switch based on the sensing voltage, and transmits a control signal to the control electrode of the switch in accordance with the valley point, | 09-17-2009 |
20090244942 | Synchronous rectification control circuit - A synchronous rectification control circuit is connected with a secondary-side rectification circuit and includes a driving circuit, a dead-time acquisition circuit, and a zero-voltage detection circuit. The driving circuit includes a differentiating circuit, a first comparator, and a capacitor, wherein the differentiating circuit generates a signal to the first comparator and the capacitor functions to charge and discharge to form a cycle. The dead-time acquisition circuit includes a second comparator and a third comparator, wherein the second comparator has a positive input connected to an output of the first comparator of the driving circuit, the second comparator has an output connected to a positive input of the third comparator, and the third comparator has a negative input connected to the output of the first comparator to acquire a dead-time signal. The zero-voltage detection circuit includes a fourth comparator and a totem pole circuit, wherein the fourth comparator has a negative input connected to an input terminal of the driving circuit for detecting a potential present in the input terminal of the driving circuit and the fourth comparator has an output that is connected to the totem pole circuit to supply an output of a signal. With such an arrangement, shorting is prevented from occurring in the secondary-side rectification circuit. | 10-01-2009 |
20090257258 | POWER SUPPLY APPARATUS AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - The present invention is directed to largely improve the efficiency at the time of light load of a power supply apparatus using a PFC controller. A PFC controller is provided with a voltage-current converter. The voltage-current converter converts voltage of a signal output from an error amplifier for detecting voltage level of output voltage to an arbitrary current value and outputs the current value as a correction current. The voltage-current converter outputs a correction current of a large current value when the error amplifier detects that the load is light, and the PFC controller performs control to decrease the output voltage. | 10-15-2009 |
20090257259 | BRIDGE SYNCHRONOUS RECTIFIER - A current-triggered synchro-rectifier comprising an electronic switch configured to be in its ON setting when the current flowing through its cathode exceeds a predetermined threshold. The electronic switch may include a half-wave rectifier wired to the source terminal and the drain terminal of a MOSFET device, and a current monitor configured to monitor the drain-current flowing through the drain terminal. The current monitor sends a gate signal to the gate terminal such that the MOSFET is switched to its ON state when the drain-current exceeds a first threshold current and the MOSFET is switched to its OFF state when the drain-current falls below a second threshold current. Usefully, the synchro-rectifier may be incorporated into a full-wave rectifier. | 10-15-2009 |
20090268494 | Synchronous Rectifier Control Circuit and Method - Circuit and method for controlling a synchronous rectifier. A circuit for monitoring the drain to source voltage of an SR transistor in a secondary side circuit of a voltage converter is disclosed, having a circuit for generating a gate control circuit for the SR MOSFET; the circuit preventing subsequent gate control signals until a primary turn on detection signal is received. In another embodiment a circuit for generating the primary turn on detection signal is provided. A method for controlling an SR transistor is disclosed comprising monitoring the drain to source voltage of the SR MOSFET, generating a gate control output, and preventing subsequent gate control output signals until a primary turn on detection signal is received. In another method embodiment a method for generating the primary turn on detection signal is disclosed. An SR embodiment incorporating the control circuit embodiments is disclosed. | 10-29-2009 |
20090296437 | Converter - A converter is provided including: a first switch; an energy transmitting element for converting input energy into output energy according to the switching of the first switch; and a switching controller for detecting a time when a voltage between a first terminal and a second terminal of the first switch reaches a valley of a resonance waveform, and actuating the first switch corresponding to one of the detected valleys of the resonance waveform. The switching controller includes: a valley detector for changing the state of the output signal whenever a voltage between a first terminal and a second terminal of the first switch reaches a valley of the resonance waveform; and a PWM controller for actuating the first switch corresponding to an output signal of the valley detector. | 12-03-2009 |
20090303765 | Switching power source system - An error voltage Verr, being a difference between DC output voltage Vout and output reference voltage Vref, and an input voltage Vin are multiplied to produce first threshold voltage signal Vth | 12-10-2009 |
20090316454 | POWER FACTOR CORRECTION CONVERTER CONTROL OFFSET - Power factor correction converter control offset apparatus and methods are disclosed. In one aspect, an apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM (Pulse Width Modulation) switching signal that controls a switch in a PFC (Power Factor Correction) converter. An offset unit is also included and is coupled to the control unit, to generate a variable offset signal to offset the control signal or a signal used by the control unit to generate the control signal. | 12-24-2009 |
20090316455 | SWITCHING MODE POWER SUPPLY CIRCUIT - A switching mode power supply (SMPS) circuit includes: a rectifying unit that rectifies an AC voltage applied from an AC input terminal; a power factor correction (PFC) and standby voltage output unit that is connected to the rectifying unit and has a PFC part and a standby voltage output part integrated therein; a PFC and standby voltage control unit that is connected to the PFC and standby voltage output unit and controlling the PFC and standby voltage output unit; and a DC/DC conversion unit that is connected to the PFC and standby voltage output unit and outputting a main voltage. | 12-24-2009 |
20100014329 | Enhanced one cycle control for power factor correction - A method of controlling a power factor correction (PFC) converter that has a discontinuous input current includes sensing the input current, sensing an output voltage and controlling a duty cycle of at least one switch in the converter in response to the sensed input current and output voltage using a control equation for controlling the duty cycle of the switch such that an average input current to the converter is sinusoidal. Example circuits capable of performing the method are also disclosed. | 01-21-2010 |
20100014330 | AC TO DC POWER CONVERTER WITH HOLD-UP TIME FUNCTION - An AC to DC power converter with hold up time function has a charging switch and a mode switch. The charging switch is connected between an output capacitor of a PFC controlling circuit and an energy-storage capacitor. The mode switch is connected between the energy-storage capacitor and an input of the PFC controlling circuit. The charging and mode switches are controlled by a PFC controller. When AC power is normal, the charging switch turns on and mode switch turns off. Meanwhile, the energy-storage capacitor and the output capacitor are connected in parallel to store energy in the energy-storage capacitor. When the AC power source is interrupted, the charging switch turns off and mode switch turns on. Therefore, the energy-storage capacitor is disconnected from the output capacitor. The PFC circuit obtains power from the energy-storage capacitor and continuous to supply an output voltage for a while. | 01-21-2010 |
20100014331 | Power Converter, Switching Control Device Thereof, And Driving Method Thereof - A power converter according to the present invention includes a power supply unit, an output unit, and a switching controller. The power supply unit includes a primary coil of a transformer that receives an input voltage, a gate electrode, and a switch having a first electrode and a second electrode that is connected to the primary coil. The output unit includes a secondary coil of the transformer, and outputs an output voltage that is converted from the input voltage by the transformer. The switching controller includes a feedback terminal that receives a feedback voltage corresponding to the output voltage, generates a burst voltage by compensating the feedback voltage according to a maximum current value that can flow between the second electrode and the first electrode of the switch, determines whether to perform a burst mode operation according to the burst voltage, and transmits a gate signal according to performance of the burst mode operation to the gate electrode of the switch. | 01-21-2010 |
20100020579 | Power Supply With Accurate Energy Measurement - A power supply includes a rectifier having an AC input and a DC output and a power factor correction (PFC) preregulator, coupled to the rectifier, that increases a power factor of the power supply. The PFC preregulator includes a controller that integrates an input power to determine energy consumption and outputs a signal indicative of the energy consumption. | 01-28-2010 |
20100067270 | METHOD AND APPARATUS TO REDUCE LINE CURRENT HARMONICS FROM A POWER SUPPLY - A method and apparatus for controlling a power converter. In one aspect, a controller for use in a power converter includes a first calculator coupled to determine an end of an on time of a power switch of the power converter by integrating an input current to output an on time signal representative of the end of the on time of the power switch. The controller also includes a second calculator coupled to determine an end of an off time of the power switch by integrating a difference between an input voltage and an output voltage to output an off time signal representative of the end of the off time of the power switch. | 03-18-2010 |
20100073975 | Device for power factor correction in three phase power supply and control method thereof - A device correcting a power factor caused by an input current delay of a three-phase inverter and a method of controlling the same are disclosed. In case of a product having a high-current power environment and a high-capacity inverter, a three-phase power factor correction (PFC) device detects any erroneous PFC operation of the three-phase inverter using a current sensor located at a common potential terminal. So, if the input current delay occurs, the three-phase PFC device delays an ON time of a switching element from a zero-crossing point of the input voltage, and performs an optimum switching operation caused by the input-current delay, resulting in the implementation of an increased power factor. | 03-25-2010 |
20100080026 | POWER FACTOR CORRECTION CIRCUIT - A power converter that is operable to convert AC power into DC power that may be delivered to a load. The power converter operates to bypass a power factor correction (PFC) circuit during a portion of each AC power cycle. The power converter bypasses the PFC circuit when an AC input voltage is greater than a DC output voltage. The power converter may also include sensing circuitry to sense the AC input voltage and the DC output voltage of the power converter. The power converter may include one or more diodes that function to deliver power directly to a load when the AC input voltage is greater than the DC output voltage, thereby bypassing the PFC circuit. The DC output voltage of the power converter may be regulated to a level that is less than the peak AC input voltage. | 04-01-2010 |
20100118571 | METHOD AND APPARATUS TO CONTROL A POWER FACTOR CORRECTION CIRCUIT - A controller for use in a power factor correction (PFC) converter is disclosed. An example controller includes an integrator coupled to receive a voltage sense signal responsive to a magnitude of an ac voltage source. The ac voltage source is coupled to an input of the PFC converter, which is coupled to an energy transfer element, which is coupled to a power switch. The integrator is further coupled to receive a current sense signal responsive to a current flowing in the power switch when the power switch is on. The integrator is to generate an integrator output signal in response to the voltage sense signal and the current sense signal. On/off logic is to be coupled to drive the power switch on and off to control a transfer of energy through the energy transfer element to a load coupled to an output of the PFC converter. The on/off logic is coupled to terminate an on time of the power switch when the integrator output signal reaches a threshold value. A gain of the integrator circuit is adjusted in response to the voltage sense signal such that the threshold value is substantially constant independent of the magnitude of the ac voltage source when a magnitude of the load is constant. | 05-13-2010 |
20100128503 | SWITCH-MODE POWER SUPPLY - Disclosed is a Power Factor Correction Controller, which comprises a boost converter, a current sensing unit, an arithmetic unit, and a switch driving unit. The current sensing unit can sense or derive the current that pass through the energy delivery device, which is normally implemented by a diode or a switch. The current sensing unit can also sense the inductor current, or the switch current. With the current sensing unit, the arithmetic unit can calculate the optimum switch on-time or when to turn off the switch, without direct-sensing of the load. The disclosed method reduces the system cost by removing the needs to sense the load condition as in the prior arts. The disclosed method also improves the system response by sensing the delivered current at energy delivery side, rather than the receiver side as in the prior arts. | 05-27-2010 |
20100128504 | MULTI-CHANNEL SWITCHING-MODE POWER SUPPLY, AND IMAGE FORMING APPARATUS AND ELECTRONIC DEVICE HAVING THE MULTI-CHANNEL SWITCHING-MODE POWER SUPPLY - A multi-channel switching-mode power supply (SMPS), an image forming apparatus and an electronic device having the multi-channel SMPS, the multi-channel SMPS including a first converter to rectify, switch, and transform AC power to generate a first DC power; a second converter to rectify, switch, and transform the AC power to generate a second DC power; a first power output unit to output the first DC power generated in the first converter; a second power output unit to output the second DC power generated in the second converter; and a second power feedback circuit unit to sense output of the first DC power from the first power output unit and immediately output a feedback signal which causes the second DC power to be generated, wherein the second converter generates the second DC power, and the second power output unit outputs the second DC power, in response to the feedback signal being output from the second power feedback circuit unit. | 05-27-2010 |
20100165679 | High efficiency universal input switching power supply - A universal input switching power supply has a signal detecting unit, two DC converting units and a physical wiring and controlling unit. The DC converting units are respectively adapted to couple to an AC power source to convert the AC power source to two first DC power sources and changes a voltage of each of the first power sources according to different voltage of the AC power source. The physical wiring and controlling unit is connected to the outputs of the DC converting units and the signal detecting unit and automatically connects the outputs of the PFC circuits in parallel if a high line voltage range of the AC power source is coupled to the full bridge rectifier. On the contrary, the physical wiring and controlling unit automatically connects the outputs of the PFC circuits in serial. Accordingly, the universal input switching power supply has good transmitting efficiency at different AC power source conditions. | 07-01-2010 |
20100202172 | H-BRIDGE CONTROL CIRCUIT - An H-bridge control circuit comprises an input stage, comparator stage, inverter stage. The operation of the H-bridge can be controlled by a single analog input signal provided by a feedback stage. Shoot-through protection is provided for the H-bridge circuit through the inclusion of a dead gap determined by inputs to the comparator stage. The dead gap can be adjusted, allowing for adjustment of the precision operation of the load. The H-bridge can be used to drive a bi-directional load such as, for example, a Peltier conditioner. | 08-12-2010 |
20100296322 | Power Switching System to Increase Induction Heating to a Load From Available AC Mains Power - In one aspect, the invention provides a power system for providing power to a load. In some embodiment, the system comprises: a rectifier configured to rectify an AC main signal to produce a rectified AC main signal; a zero cross detector configured to receive the AC main signal and to detect when the AC main signal equals zero; a switching device having (i) a first terminal connected to a first node, wherein a first output terminal of the rectifier is also connected to the first node and (ii) a second terminal connected to a second node; a tank circuit having (i) a first terminal coupled to a third node, wherein a second output terminal of the rectifier is also coupled to the third node and (ii) a second terminal coupled to the second node; a current and/or voltage detector connected to the second node; and a controller in communication with the current detector and zero cross detector and configured to turn on and off the switching device based on, at least in part, information received from the zero cross detector and the current and/or voltage detector. | 11-25-2010 |
20100315849 | POWER SUPPLY CONTROL - Systems and methods for operating an uninterruptable power supply are provided. The uninterruptable power supply may include a rectifier that has a transistor and an inductor. The uninterruptable power supply may also include a controller. A current sensor can be configured to detect inductor current and to provide a detected inductor current value to the controller to generate a current error value based and to generate a pulse width modulation control signal based in part on the current error value. The controller can apply the pulse width modulation control signal to the transistor to adjust a switching frequency of the transistor. | 12-16-2010 |
20110090724 | POWER CONVERTER - An isolated power converter comprising a transformer arranged in such a way that the mirrored primary voltage on the secondary side has a positive potential relative to ground, said converter comprising a derivating net arranged to cause the second transistor to conduct in dependence of the voltage across the secondary winding, the source of the second transistor being connected to the negative end of the secondary winding, the drain of a third transistor further being connected to the positive end of the secondary winding, a second capacitor and a second resistor being connected between the gate and the source of the third transistor, a third resistor connected between the second resistor and the drain of the second transistor, a third capacitor connected between the sources of the second and third transistors to provide a first output voltage on one terminal of the third capacitor and a second output voltage on the other terminal of the third capacitor. | 04-21-2011 |
20110116291 | HIGH EFFICIENCY MULTI-PHASE GENERATOR - A generator system that includes a six-phase AC machine and an active rectifier bridge employing low on-resistance switches, such as MOSFET switches, for converting the AC current from the machine to a DC current. The system also includes a switch control circuit to switch the MOSFET switches in synchronization with the six-phase current flow. The system determines the phase-to-ground voltages of the machine for inputs to the switch control circuit. The control circuit calculates the phase-to-phase voltages from the phase-to-ground voltages. The control circuit uses a specific control scheme to determine if each of the phase-to-phase voltages is above or below first and second predetermined threshold voltages, where if the phase-to-phase voltage is above the first threshold voltage, the control circuit closes the switch, and if the phase-to-phase voltage is below the second threshold voltage, the control circuit opens the switch. | 05-19-2011 |
20110134669 | UNBALANCED VOLTAGE COMPENSATION METHOD, UNBALANCED VOLTAGE COMPENSATOR, THREE-PHASE CONVERTER CONTROL METHOD, AND CONTROLLER OF THREE-PHASE CONVERTER - In compensating for unbalanced voltages of three-phase AC, instantaneous values of wye-phase voltages 120° out of phase with each other are obtained from line voltages using a centroid vector operation, symmetrical component voltages of three-phase balanced system are obtained from the instantaneous values of wye-phase voltages, a compensation signal to compensate unbalanced voltages of three-phase AC is generated from zero-phase-sequence voltage of symmetrical component voltages is generated, wye-phase voltages 120° out of phase, the unbalanced voltages of which are compensated, are obtained from the compensation signal and the symmetrical component voltages, a control signal of a PWM conversion is generated based on the compensated wye-phase voltage compensated, and the unbalanced voltages of three-phase AC are compensated. The amount of time to compensate the three-phase unbalanced voltages required for detecting an unbalance of voltages and generating a control signal can be shortened. | 06-09-2011 |
20110242862 | SOFT START CIRCUIT FOR POWER FACTOR CORRECTION NETWORK - A soft start circuit for a power factor correction circuit. In one embodiment, the soft start circuit controls an input to a power factor correction pre-regulator chip to allow the output voltage to be set initially to a value lower than the desired nominal output voltage of the power factor correction circuit. Once stabilized, the input to the power factor correction pre-regulator chip is changed to increase the output voltage to the desired nominal output voltage of the power factor correction, thereby avoiding any significant overshoot of the desired nominal output. | 10-06-2011 |
20110261599 | CONTROLLER FOR A POWER CONVERSION CIRCUIT - A power conversion controller for controlling the operation of a switch in a power conversion circuit, wherein the power conversion controller is configured to operate the switch according to: a variable frequency mode of operation for switching frequencies greater than a minimum threshold value; and a fixed frequency mode of operation at a switching frequency equal to the minimum threshold value. | 10-27-2011 |
20110305052 | METHOD AND APPARATUS TO CONTROL A POWER FACTOR CORRECTION CIRCUIT - An example power factor correction (PFC) converter includes an energy transfer element, a power switch, and a controller. The controller includes an integrator and on/off logic. The integrator generates an integrator output signal in response to a voltage sense signal and a current sense signal. The on/off logic drives the power switch on and off to control a transfer of energy through the energy transfer element to an output of the PFC converter and terminates an on time of the power switch when the integrator output signal reaches a threshold value. A gain of the integrator is adjusted in response to the voltage sense signal such that the threshold value is substantially constant independent of the magnitude of the ac voltage source when a load condition at the output of the PFC converter is constant. | 12-15-2011 |
20120008350 | METHOD OF CONTROLLING A PFC STAGE OPERATING IN BOUNDARY CONDUCTION MODE, A PFC STAGE, AND AN SMPS - For many applications an SMPS is designed to operate in boundary conduction mode. As the load decreases the switching frequency increases, and so the concept of valley skipping may be used in which the switching frequency is clamped, by delaying to turn on the time of the active switch, for an integral number of cycles of a resonant circuit in the SMPS. With further reduction of the load, additional valleys may be skipped. However, each change in the number of valleys skipped results in a step in the input current that is drawn, distorting the ideal mains sine wave, thereby increasing unwanted harmonics. | 01-12-2012 |
20120008351 | VOLTAGE-DIVIDING POWER FACTOR CORRECTION CIRCUIT, VOLTAGE-DIVIDING POWER FACTOR CORRECTION APPARATUS AND VOLTAGE-DIVIDING POWER FACTOR CORRECTION METHOD - A circuit include: a first power factor correction circuit that forces current produced by the positive AC voltage to be in phase with the positive AC voltage so that a power factor of electric power is improved; a second power factor correction circuit that forces current produced by the negative AC voltage to be in phase with the negative AC voltage so that a power factor of electric power is improved; and an output circuit including a first capacitor storing first electric power with a power factor improved by the first power factor correction circuit and a second capacitor storing second electric power with a power factor improved by the second power factor correction circuit, the first capacitor and the second capacitor being provided in series, the output circuit outputting the first electric power stored in the first capacitor and the second electric power stored in the second capacitor. | 01-12-2012 |
20120014150 | POWER FACTOR CORRECTION EFFICIENCY IMPROVEMENT CIRCUIT, A CONVERTER EMPLOYING THE CIRCUIT AND A METHOD OF MANUFACTURING A CONVERTER - The disclosure provides a power factor correcting (PFC) circuit, a power supply and a method of manufacturing a power converter. In one embodiment, the PFC circuit has a positive input terminal, an output terminal and a ground terminal and includes: (1) a power factor inductor coupled in series between the positive input terminal and the output terminal, (2) a main switch configured to periodically connect the power factor inductor to the ground terminal and (3) a clamping capacitor coupled to the power factor inductor and configured to provide zero turn-off loss for the main switch. | 01-19-2012 |
20120026767 | POWER CONVERSION DEVICE - A power conversion device connected with a three-phase power system through a transformer, including unit converters cascade-connected so that reactors are unnecessary, and volume and weight are reduced. The secondary winding of the transformer is an open winding having six terminals. A first converter group, includes a circuit which has three converter arms, which are star-connected, connected to three of the terminals of the secondary winding. A second converter group, having three different converter arms which are star-connected, is connected to three other terminals of the secondary winding. A neutral point (the point where the star connection is made) of the first converter group, and a neutral point of the second converter group are made to be the output terminals of the power conversion device. | 02-02-2012 |
20120057382 | POWER FACTOR CORRECTION CONVERTER - A switching control circuit includes an A/D converter that converts detection signals of an input voltage detection circuit, a current detection resistor, and an output voltage detection circuit into a digital signal, a D/A converter that provides a reference voltage to an analog comparator, a PWM circuit that outputs a control voltage to a switching element, and a CPU that provides a specified value to the D/A converter as a reference value, reads the values converted by the A/D converter, and obtains the average value of the inductor current. The CPU reads an inductor current Ib when the output of the PWM circuit is set at a high level, and obtains the average value of an inductor current peak value Ip determined by the specified value and the inductor current value Ib at turn-on as an average inductor current value ILav. | 03-08-2012 |
20120092911 | POWER CONVERSION APPARATUS AND METHOD - According to one embodiment, a power conversion apparatus determines a peak value of circuit current in each pulse cycle, from a corrected output voltage value by subtracting a predetermined reference voltage from an output voltage detected by the output voltage detector, and an input voltage detected by the input voltage detector. The pulse signal output unit outputs a pulse signal to the first switch when the polarity of input voltage is positive, and outputs a pulse signal to the second switch when the polarity of input voltage is negative. A pulse signal turns on in synchronization with a clock signal input from the oscillator, and is kept on until the circuit current detected by the circuit current detector reaches the peak value. A pulse signal turns off when the circuit current reaches the peak value, and turns on again in synchronization with the next clock signal. | 04-19-2012 |
20120120693 | RECTIFIER LESS BIDIRECTIONAL AC TO DC CONVERTER - A split supply DC to DC converter is coupled through a low resistance path to a secondary coil of an ac line transformer, and is used as a high efficiency bidirectional AC to DC convertor. A small sense resistor is placed in series with the secondary in order to measure secondary current. The duty cycle of the DC to DC converter, which defines the voltage of what is normally treated as an output node, is modulated by the monitored secondary current. By coupling such an output node across the secondary coil, a voltage to current relationship is defined across the secondary to be that of a simulated resistor. Such a resistor will absorb power from the AC line and transfer it efficiently to the split supplies. The power transfer direction is reversed with the same efficiency by defining the current to voltage relationship to be one of a negative resistor. | 05-17-2012 |
20120134187 | POWER FACTOR CONTROL SYSTEMS AND METHODS - A boost converter comprises an inductance that receives an input signal. A switch controls current supplied by 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. | 05-31-2012 |
20120170335 | SWITCH CONTROL CIRCUIT, CONVERTER USING THE SAME, AND SWITCH CONTROLLING METHOD - The present invention relates to a switch control circuit, a switch control method, and a converter using the same. | 07-05-2012 |
20120201063 | SWITCHING POWER SUPPLY CIRCUIT AND POWER FACTOR CONTROLLER - The switching power supply circuit includes a full-wave rectifier ( | 08-09-2012 |
20120212984 | POWER SUPPLY DEVICE - A power supply device that is able to switch between rectifier circuits in accordance with the voltage of a multi-phase AC power supply, and able to accommodate different power supply voltages. The power supply device has rectifier circuits that include a first circuit that rectifies a line voltage of the AC power supply, converting it into a direct current voltage of a first predetermined value, when the voltage of the AC power supply is a predetermined value or less, and a second circuit that rectifies a phase voltage of the AC power supply, converting it into a direct current voltage of a second predetermined value, when the voltage of the alternating current power supply exceeds the predetermined value. The first and second circuits operate in such a way that the AC input current is of the same phase as the voltage of the AC power supply. | 08-23-2012 |
20120218793 | MULTIPLE USE OF A CURRENT TRANSFORMER - The invention relates to a power converter and a method for power conversion. A converter transformer with a primary winding and a secondary winding, an integrated current transformer and a synchronous rectifier are provided, wherein a controller is arranged in order to close respectively to open the synchronous rectifier depending on the measured winding current. The controller is arranged to close and/or to open the synchronous rectifier as a function of the winding current at a later and/or at an earlier time, whereby the time difference between the later and the earlier time is linearly dependent on the winding current difference, particularly in order to optimise a discharge process, and/or that an auxiliary supply circuit is arranged in order to provide auxiliary supply power, wherein the auxiliary supply circuit is arranged to derive auxiliary supply power from the integrated current transformer, in particular in overload situations. | 08-30-2012 |
20120243275 | SWITCH CONTROL CIRCUIT, SWITCH CONTROL METHOD, POWER CONVERTER, AND POWER CONVERSION METHOD FOR CONTROLLING CONDUCTING STATUSES OF SWITCH ELEMENTS IN BRIDGELESS SWITCHING CIRCUIT - A switch control circuit for controlling a first switch element and a second switch element within a bridgeless switching circuit is provided. The bridgeless switching circuit generates an output signal according to an alternating current signal. The switch control circuit includes a current generating element and a phase generating element. The current generating element is for sensing a first current flowing through the first switch element and a second current flowing through the second switch element, and generating a phase comparison result according to the first and the second currents. The phase generating element generates a first control signal and a second control signal according to a power factor correction signal and the phase comparison result to control conducting status of the first and the second switch elements, respectively. | 09-27-2012 |
20130077365 | Switching Power Supply and AC Waveform Generating Method Thereof - The present invention relates to a PFC switching power supply which can perforin polarity determination and voltage detection of AC voltage without using a DC isolator such as a transformer. | 03-28-2013 |
20130094258 | ACTIVE FRONT END POWER CONVERTER WITH DIAGNOSTIC AND FAILURE PREVENTION USING PEAK DETECTOR WITH DECAY - Active front end power conversion systems are presented having a peak detector with adjustable decay providing a signal to an overload protection component to selectively discontinue rectifier switching control signals for protection of active rectifier switches during unbalanced line voltage conditions. | 04-18-2013 |
20130107592 | REFERENCE VOLTAGE REGULATING METHOD AND CIRCUIT FOR CONSTANT CURRENT DRIVER | 05-02-2013 |
20130107593 | DC POWER SUPPLY WITH LOW POWER LOSS | 05-02-2013 |
20130121048 | Wide Input Voltage Range Power Supply Circuit - A wide input voltage power supply circuit for a load includes a first regulation stage and a second regulation stage. The first regulation stage includes a linear regulator circuit configured to maintain a bus voltage within a predefined voltage range when an input voltage exceeds a predefined input level. A second regulation stage includes a buck converter circuit configured to regulate an average bus voltage to a predetermined load level. The second regulation stage includes an under voltage lockout configuration, with the under voltage lockout configured to set a minimum turn-on voltage for the load. | 05-16-2013 |
20130121049 | EMI Frequency Spreading Method for Switching Power Converter - A controller of a switching power converter sets an actual turn-on time of a switch in the switching power converter in each switching cycle by selecting one of a plurality of valley points of the output voltage of the switching power converter occurring subsequent to the desired turn-on time of the switch. The desired turn-on time of the switch may be calculated according to the regulation scheme employed by the switching power converter. The controller selects one of the plurality of valley points randomly from switching cycle to switching cycle. The controller generates a control signal to turn on the switching power converter at the selected one of the plurality of valley points of the output voltage occurring subsequent to the desired turn-on time. | 05-16-2013 |
20130141955 | CONTROLLER WITH PUNCTUATED SWITCHING CONTROL CIRCUIT - An example controller for use in a power supply includes a zero crossing detection (ZCD) circuit, a threshold detection circuit, and a punctuated switching control circuit. The ZCD circuit generates a ZCD signal that pulses each zero-crossing of an ac input voltage. The threshold detection circuit receives and compares an output of the power supply with a threshold reference. The punctuated switching control circuit generates a switching signal to control a switch to regulate the output of the power supply. The switching signal is generated to have intervals of switching and intervals of no switching, where each interval of switching begins responsive to the output of the power supply dropping below the threshold reference and each interval of no switching begins responsive to the output rising above the threshold reference. Each interval has a beginning that is synchronized with a pulse of the ZCD signal. | 06-06-2013 |
20130163300 | BOOST POWER FACTOR CORRECTION CONTROLLER - The present invention relates to a power factor correction (PFC) controller. In one embodiment, a boost PFC controller configured in an AC/DC converter can include: (i) a conductive signal generator configured to receive a first sampling signal, and to generate a conductive signal according to the first sampling signal and a first control signal; (ii) a shutdown signal generator configured to compare a second control signal against a third control signal, and to generate a shutdown signal when the second control signal reaches a level of the third control signal; and (iii) a logic controller coupled to the conductive signal generator and the shutdown signal generator to control a switching state of a power switch in AC/DC converter. | 06-27-2013 |
20130176758 | MOSFET BRIDGE RECTIFIER - A bridge rectifier is established by MOSFETs instead of diodes. The MOSFET bridge rectifier includes a voltage detector to detect the voltages of two AC input terminals of the MOSFET bridge rectifier, for identifying the positive and negative half cycles of an AC voltage input to the MOSFET bridge rectifier, thereby accurately controlling the MOSFETs. | 07-11-2013 |
20130194844 | Closed Loop Control of a Cyclo-Converter - A three-phase resonant cyclo-converter including a closed loop control module for controlling the switching frequency of the cyclo-converter, the closed loop control module including: a voltage signal development module arranged to develop a voltage signal representative of a voltage output waveform of the cyclo-converter, a storage module arranged to accumulate voltage signal values for phase portions of the voltage output waveform, where the voltage signal values are based on a voltage error signal and accumulated historical voltage signal values for the same corresponding phase portions, and a switching frequency control module arranged to develop a switching frequency control signal to control the switching frequency of the cyclo-converter based on the accumulated voltage signal values for corresponding phase portions of the voltage output waveform, and a proportional voltage signal based on a difference between the developed voltage signal and a reference voltage signal. | 08-01-2013 |
20130215655 | SWITCH CONTROLLER, SWITCH CONTROL METHOD, AND POWER SUPPLY DEVICE COMPRISING THE SWITCH CONTROLLER - An exemplary embodiment of the present invention relates to a switch controller, a method for controlling a switch, and a power supply including the switch controller. According to the exemplary embodiment of the present invention, an AC input passed through a dimmer is rectified such that an input voltage is generated, and the input voltage is transmitted to the power switch. A charging current is generated using a voltage that depends on the input voltage, a zero cross-point at which the input voltage becomes zero voltage is detected using a detection voltage output from a current source, and a reference signal synchronized at the detected zero cross-point is generated. | 08-22-2013 |
20130223119 | BOOST PFC CONTROLLER - The present invention pertains to a boost power factor correction (PFC) controller. In one embodiment, a boost PFC controller for an AC/DC converter can include: an off signal generator that compares an inductor current sample signal against a first control signal, where the inductor current sample signal increases during an on time of a power switch of the AC/DC converter, and the off signal generator generates an off signal when the inductor current sample signal reaches the first control signal level; and an on signal generator that compares a second control signal against a third control signal, where the second control signal increases during the off time of the power switch, and the on signal generator generates an on signal when the second control signal reaches the third control signal level. | 08-29-2013 |
20130272042 | CONTROL TECHNIQUE FOR A THREE-PHASE BOOST CONVERTER TO ACHIEVE RESISTIVE INPUT BEHAVIOR - A three-phase boost converter is disclosed, as well as a related control technique. In certain embodiments, the provided boost converter enables efficient transfer of energy from an irregular input power source to a battery storage device or a DC link. To achieve maximum power absorption in such cases, the provided embodiments utilize a variable resistive behavior across each phase of the converter using feedback control. | 10-17-2013 |
20130279224 | EFFICIENCY DYNAMIC POWER CONVERTER - 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 |
20130294125 | CONTROL CIRCUIT OF POWER SUPPLY SYSTEM - Aspects of the invention provide an error amplifier that can compare a feedback voltage of an output voltage with a reference voltage to produce a resulting error signal in cooperation with a phase compensating circuit. In some aspects of the invention, an AC detecting circuit makes a decision as to whether a detected input voltage signal is that of a 100 Vac system or that of a 200 Vac system to change the gain of the error amplifier according to the result of the decision. When the voltage signal Vis is lower than the threshold voltage established beforehand, for making the transient response speed of the phase compensating circuit faster, the AC detecting circuit increases the gain of the error amplifier. When the voltage signal is higher than the threshold voltage established beforehand, for making a power factor higher, the AC detecting circuit decreases the gain of the error amplifier. | 11-07-2013 |
20130308359 | SWITCHING POWER SUPPLY DEVICE - In some aspects of the invention, a zero current detecting circuit of a switching power supply device detects a gradient of the current flowing in an inductor in the OFF state of the switching element and detects the timing at which the current through the inductor becomes zero corresponding to the detected gradient of the inductor current. Specifically, the zero current detecting circuit receives a signal for controlling ON/OFF driving of the switching element and a voltage signal proportional to the current flowing through the inductor in an OFF state of the switching element. The voltage signal can be compared sequentially with first and second comparison reference voltages to control charging and discharging of a capacitor. Further, the zero current detecting circuit can detect a timing at which the charging and discharging voltage of the capacitor as the timing of zero current flowing through the inductor. | 11-21-2013 |
20130308360 | POWER FACTOR CORRECTION CIRCUIT - Provided is a power factor correction circuit capable of reducing ringing sound of a transformer produced when an overshoot protection is effected. An output voltage control circuit performs constant voltage-control such that capacitor charge voltage of an output capacitor corresponds to a first voltage value, and when the capacitor charge voltage of the output capacitor reaches a second voltage value higher than the first voltage value, an overvoltage detecting unit detects the second voltage value. Further, a current limiting unit detects a value of a switching current through a switching element, and determines a limiting value of the level of the switching current. Then, the switching current is limited to the limiting value, and when an overvoltage detecting unit detects the second voltage value, a limiting value changing unit causes the current limiting unit to change the limiting value to decrease the value of the switching current. | 11-21-2013 |
20130314960 | DIRECT CURRENT VOLTAGE GENERATING APPARATUS - An exemplary direct current (DC) voltage generating apparatus for generating stable DC voltages includes a voltage conversion circuit, a voltage control circuit, and a voltage regulating circuit. The voltage conversion circuit receives an alternating current (AC) voltage, and converts the AC voltage to a first DC voltage. The voltage control circuit receives the first DC voltage, and converts the first DC voltage to a second DC voltage and a control signal. The voltage regulating circuit receives the control signal, and regulates the second DC voltage to a stable second DC voltage at the voltage control circuit according to the control signal. | 11-28-2013 |
20130314961 | SWITCH CONTROL DEVICE, POWER SUPPLY DEVICE COMPRISING THE SAME, AND DRIVING METHOD OF POWER SUPPLY DEVICE - The present invention relates to a switch controller, a power supply including the same, and a driving method thereof. An AC input of the power supply is connected to a rectification circuit. The power supply includes a power switch to which the AC input passed through the rectification circuit flows during a turn-on period of the power switch and a switch controller detecting a half-on time point that is an intermediate time point of the turn-on period, calculating the AC current using a result of sampling a sense voltage that depends on a current flowing to the power switch during the turn-on period at the half-on time point and the turn-on period, and controlling the input current to have a reference sine wave. The reference sine wave has a sine wave that is full-wave rectified from the AC input. | 11-28-2013 |
20130336032 | METHOD OF CONTROLLING SINGLE-PHASE VOLTAGE SOURCE AC/DC CONVERTER AND INTERCONNECTION SYSTEM - A method of controlling a single-phase voltage source AC/DC converting circuit has internal equivalent impedance as seen from an AC terminal, for converting power from a DC voltage source connected to a DC terminal to single-phase AC power or for converting single-phase AC power from a single-phase AC source connected to the AC terminal to DC power in accordance with a pulse width of a gate signal generated based on a PWM command. | 12-19-2013 |
20140003106 | BOOST CONVERTER | 01-02-2014 |
20140016381 | CURRENT DETECTING CIRCUIT, CONTROLLING CIRCUIT AND POWER CONVERSION CIRCUIT - The present invention provides a current detection circuit, a controlling circuit using the current detection circuit and a power conversion circuit using the controlling circuit, the current detection circuit comprises a sample keeping circuit, a rising edge detection circuit, a falling edge detection circuit, a sequential controlling circuit, a synchronous detection circuit and a lowpass filter. The inventive current detection circuit for the power conversion circuit obtains signals of the output current by detecting loop current of the master switch and processing the loop current. | 01-16-2014 |
20140043878 | High-Efficiency, Low-Power Power Supply Circuit - A power supply circuit includes a rectifier, a charging circuit, and a storage capacitor. An AC signal is rectified by the rectifier thereby generating a rectified signal V | 02-13-2014 |
20140043879 | SWITCH CONTROL DEVICE, POWER SUPPLY DEVICE COMPRISING THE SAME, AND DRIVING METHOD OF POWER SUPPLY DEVICE - The present invention relates to a switch controller, a power supply including the same, and a method for driving the same. An AC input of the power supply is connected to a rectification circuit. The power supply includes a power switch to which an input current passed through the rectification circuit flows during an on-period and a switch controller, the switch controller detects a half-on time point that is the intermediate time point of the on-period, detects a sense voltage that is determined by a current flowing to the power switch during the on-period at the half-on time point, generates a modulation wave by controlling a reference wave according to the detected voltage, and controls switching operation of the power switch according to the modulation wave. | 02-13-2014 |
20140063879 | RECTIFIER CIRCUIT AND ELECTRONIC DEVICE USING SAME - A rectifier circuit includes a three-phase alternating current (AC) voltage, a first rectifier unit, a second rectifier unit, a third rectifier unit, a first voltage output terminal, a second voltage output terminal, a first energy storing circuit and a second energy storing circuit. The three-phase AC voltage generates a first AC voltage, a second AC voltage, and a third AC voltage, and outputs them to the first rectifier circuit, a second rectifier circuit, and a third rectifier circuit correspondingly. The first energy storing circuit and the second storing circuit are connected in series and are coupled between the first voltage output terminal and the second voltage output terminal, to drive a load. In a positive period of each AC voltage, the second energy storing circuit is charged by each rectifier unit. In a negative period of each AC voltage, the first energy storing circuit is charged by each rectifier unit. | 03-06-2014 |
20140063880 | RECTIFIER CIRCUIT AND ELECTRONIC DEVICE USING SAME - A rectifier circuit includes a first alternating current (AC) voltage input terminal, a second AC voltage input terminal, a signal generating circuit, a first energy generating circuit, a second energy generating circuit, a third energy generating circuit, a first output terminal, and a second output terminal The first and second AC voltage input terminals receive an AC voltage. The signal generating circuit generates control signals. The first energy storing circuit is charged by the AC voltage. In a positive period of the AC voltage, the first energy storing circuit discharges to the second energy storing circuit. In a negative period of the AC voltage, the first energy storing circuit discharges to the third energy storing circuit The second energy storing circuit and the third energy storing circuit discharge to a load via the first output terminal | 03-06-2014 |
20140071724 | BRIDGE-LESS STEP-UP SWITCHING POWER SUPPLY DEVICE - A bridge-less step-up switching power supply device includes (i) a first and a second reactor having: a first and a second main winding connected to a first and a second input terminal, respectively; and a first and a second auxiliary winding magnetically coupled to the first main winding and connected to the first and second main windings, the first and second auxiliary windings having a first and a second leakage inductance, respectively; (ii) a first and a second diode connected between the first and second auxiliary windings and a first output terminal, respectively; (iii) a first capacitor connected between the first output terminal and a second output terminal; (iv) a second capacitor connected between a connection point of a third switch and a fourth switch, and the first output terminal; and (v) a controller for controlling turning on/off of first to fourth switches. | 03-13-2014 |
20140071725 | CONTROLLER WITH PUNCTUATED SWITCHING CONTROL CIRCUIT - A power supply controller includes a switching signal generator, a zero crossing detection (ZCD) circuit, first and second logic gates, and an interval generator. The switching signal generator generates a switching signal and the ZCD circuit generates a ZCD signal that pulses each zero-crossing of an ac input voltage. The first logic gate generates a first output when the ZCD signal pulses while the output of the power supply is below a threshold reference. The second logic gate generates a second output when the ZCD signal pulses while the output of the power supply is above the threshold reference. The interval generator is enabled in response to the first output and disabled in response to the second output. The interval generator allows the switching signal to pass through the interval generator to the switch when enabled and does not allow the switching signal to pass when disabled. | 03-13-2014 |
20140078798 | POWER FACTOR CONTROLLER AND METHOD - In accordance with an embodiment, a converter includes a power factor controller that varies the switching frequency of a switching transistor in accordance with a signal representative of power at the input of the converter. | 03-20-2014 |
20140085949 | SWITCHING POWER SUPPLY - A switching power supply that conducts switching of an input voltage by a switching element to obtain a specified output voltage includes: an ON width controlling component that controls an ON width of the switching element; a zero current detecting component that detects zero current through the switching element to turn ON the switching element; a frequency reducing component that delays a turn ON timing of the switching element upon detection of a light load condition by a load condition detecting component to reduce a switching frequency of the switching element; and an AC period detecting component that detects a period of the input voltage to hold the load condition detected by the load condition detecting component over every period detected by the AC period detecting component. | 03-27-2014 |
20140098583 | POWER SOURCE APPARATUS - A power source apparatus includes: a first series circuit that has a first rectifier element, a first switching element, and a third rectifier element; a second series circuit that has a second rectifier element, a second switching element, and a fourth rectifier element; a reactor connected between a connecting point of the first rectifier element and the first switching element and a connecting point of the second rectifier element and the second switching element; and a current detection unit having a first resistor element. The first and second switching elements are controllable based on a first zero current detection signal in accordance with a first current detected in the current detection unit, and a desired direct current voltage is fed to a load circuit. | 04-10-2014 |
20140104908 | Method for Activating a Rectifier - A method for activating a rectifier having active switching elements in the event of a load dump, the active switching elements being activated during the voltage clamping in such a way that the clamp voltage in at least one switching branch complies with a signal form predefined as a function of time within at least one half-period of the current to be rectified. | 04-17-2014 |
20140119077 | Power Converter with Bias Voltage Regulation Circuit - A power conversion circuit includes a voltage boost circuit configured to generate an output voltage in response to an input voltage, a boost controller configured to control operation of the voltage boost circuit, and a bias voltage generation circuit configured to generate a bias voltage. The bias generation circuit is configured to regulate a level of the bias voltage in response to a level of the input voltage. | 05-01-2014 |
20140119078 | Dual Mode Power Supply Controller with Current Regulation - A power conversion circuit includes a voltage boost circuit including a boost inductor configured to generate an output voltage in response to an input voltage, and a boost controller configured to control operation of the voltage boost circuit. The boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor. | 05-01-2014 |
20140119079 | POWER FACTOR CORRECTION CIRCUIT AND POWER SUPPLY DEVICE INCLUDING THE SAME - There are provided an interleaved power factor correction circuit and a power supply device including the same, the power factor correction circuit including: a main switching unit including a first main switch and a second main switch; an auxiliary switching unit including a first auxiliary switch and a second auxiliary switch; an inductor unit positioned between an input power terminal to which the input power is applied and the main switching unit and storing or discharging power according to the switching operations of the main switching unit; and an auxiliary inductor adjusting an amount of current flowing in the auxiliary switching unit when the auxiliary switching unit performs switching operations. | 05-01-2014 |
20140126258 | NON-ISOLATED AC-TO-DC CONVERTER HAVING A LOW CHARGING CURRENT INITIAL POWER UP MODE - In a steady state operation mode, a charging circuit of a non-isolated AC-to-DC converter decouples an output voltage V | 05-08-2014 |
20140140113 | AC-DC RESONANT CONVERTER THAT PROVIDES HIGH EFFICIENCY AND HIGH POWER DENSITY - The disclosed embodiments provide an AC/DC power converter that converts an AC input voltage into a DC output voltage. This AC/DC power converter includes an input rectifier stage which rectifies an AC input voltage into a first rectified voltage of a first constant polarity and a first amplitude. The AC/DC power converter also includes a switching resonant stage which is directly coupled to the output of the input rectifier stage. This switching resonant stage converts the rectified voltage into a second rectified voltage of a second constant polarity and a second amplitude. The AC/DC power converter additionally includes an output rectifier stage coupled to the output of the switching resonant stage, wherein the output rectifier stage rectifies the second rectified voltage into a DC voltage output. | 05-22-2014 |
20140140114 | FULL-BRIDGE POWER CONVERTER - A full-bridge power converter is provided. A control unit | 05-22-2014 |
20140140115 | Monolithic AC/DC Converter for Generating DC Supply Voltage - An integrated circuit (IC) comprises a rectifier/regulator circuit coupled to receive an ac source voltage and output a regulated dc voltage. The rectifier/regulator circuit includes first and second switching elements that provide charging current when enabled. The first and second switching elements do not provide charging current when disabled. A sensor circuit is coupled to sense the regulated dc voltage and generate a feedback control signal coupled to the rectifier/regulator circuit that enables the first and second switching elements when the regulated do voltage is above a target voltage, and disables the first and second switching elements when the regulated do voltage is below the target voltage. | 05-22-2014 |
20140169050 | BLANKING CONTROL CIRCUIT FOR CONTROLLING SYNCHRONOUS RECTIFIER AND METHOD OF CONTROLLING SYNCHRONOUS RECTIFIER USING THE CIRCUIT - Disclosed herein are a blanking control circuit for controlling a synchronous rectifier and a method of controlling the synchronous rectifier by using the blanking control circuit. The blanking control circuit for controlling a synchronous rectifier includes: a power generating unit that receives power from the outside to generate a reference voltage and a bias current that are used in an integrated circuit (IC); a driving unit that receives the reference voltage and the bias current generated by using the power generating unit to generate a voltage for driving a switch of the synchronous rectifier; and a load sensing unit that determines a state of a load by sensing an output voltage of the synchronous rectifier driven by the driving unit, and generates a corresponding signal if the state of the load is in a low load state so as to turn off the switch of the synchronous rectifier. | 06-19-2014 |
20140177302 | POWER FACTOR CORRECTION APPARATUS AND POWER SUPPLY APPARATUS - There are provided a power factor correction apparatus and a power supply apparatus, the power supply apparatus including a power supply unit switching input power to supply preset driving power to a load, and a control unit providing a switching control signal having a preset number of pulses for a predetermined time to the power supply unit to control power switching of the power supply unit, and when a voltage level of the driving power is equal to or higher than that of at least one intermediate voltage set between a preset normal operating voltage and a preset abnormal operating voltage, skipping a portion of the number of pulses of the switching control signal for the predetermined time. | 06-26-2014 |
20140177303 | VOLT-SECOND INTEGRATION CABLE COMPENSATION CIRCUIT - A power converter (such as a battery charger) includes a cable configured to deliver a source voltage and current to a load, where the cable is anticipated to drop some voltage as the load current increases. The power converter also includes a regulator having a feedback-adjusting transistor configured to gradually compensate for the dropped cable voltage as the load current increases. The transistor has a gate capacitance and a resistance forming an integrator configured to filter a volt-second product of an output waveshape of the converter to derive an average voltage correlated to the load current as the load current increases. The regulator is configured to increase a gate voltage of the transistor through a threshold region of the transistor and gradually turn the transistor on. The transistor is configured to apply an adjusting resistance coupled to a feedback sensing node of the regulator to increase the source voltage to compensate for the cable voltage drop and improve the load voltage regulation. | 06-26-2014 |
20140185343 | SWITCHING MODE POWER SUPPLY AND CONTROL METHOD THEREOF - There is provided a switching mode power supply having primary and secondary induction coils inductively coupled to each other and converting a voltage applied to the primary induction coil to supply the converted voltage to the secondary induction coil, the switching mode power supply including a power switching unit switching the voltage applied to the primary induction coil, a load information obtaining unit obtaining load information relating to a load connected to the secondary induction coil, a bias current controlling unit controlling a switching driving current based on the load information; and a driving unit driving the power switching unit based on the load information and the switching driving current. | 07-03-2014 |
20140192575 | METHOD OF FORMING A SYNCHRONOUS RECTIFIER CONTROLLER AND STRUCTURE THEREFOR - In one embodiment, a synchronous rectifier controller is configured to initiate forming an off-time interval for a first period of time responsively to the controller forming a disable state of a switching signal wherein the control circuit maintains the switching signal in the disable state for at least the off-time interval. The controller is also configured to restart forming the off-time interval responsively to a voltage of a synchronous rectifier becoming a first value prior to expiration of the first period of time. | 07-10-2014 |
20140204639 | POWER SUPPLY APPARATUS - A power supply apparatus mainly includes a secondary side controller, a digital isolator, a plurality of isolation sensing units, and a driving unit. The secondary side controller is configured to isolatedly measure voltages and currents, and is configured to isolatedly control the driving unit. The power supply apparatus includes a controller only, i.e. the secondary side controller | 07-24-2014 |
20140204640 | METHOD AND APPARATUS FOR CHANGING A FREQUENCY OF A SWITCH PRIOR TO A LEVEL OF CURRENT RECEIVED FROM AN INDUCTOR DECREASING TO A PREDETERMINED LEVEL - A controller including a switch, a first module, a second module, and a control module. The switch receives current from an inductor and bypasses a portion of the current from being received by a load. The switch is cycled between a first state and a second state at a frequency. The first module, for a first cycle of the switch, determines a first amount of time the switch is in the first state. The second module, based on the first amount of time, determines a second amount of time for a level of the current to decrease to a predetermined level. The second amount of time begins during the first cycle and when the switch transitions from the first state to the second state. The control module, based on the second amount of time and prior to the current decreasing to the predetermined level, changes the frequency of the switch. | 07-24-2014 |
20140254220 | ELECTRONIC POWER CONVERTER WITH GROUND REFERENCED LOSSLESS CURRENT SENSING - A current sensing circuit for an electronic power converter having an inductor that is not referenced to ground is configured to provide an output signal that is referenced to ground and is proportional to the current flow between the inductor and a load in an electrical power system. The current sensing circuit includes outputs associated with a voltage of the inductor, a current source circuit, a current steering circuit responsive to the voltage outputs and a level shifting circuit. | 09-11-2014 |
20140268952 | BRIDGELESS INTERLEAVED POWER FACTOR CORRECTION CIRCUIT USING A PFC INDUCTOR WITH QUAD-WINDING ON A SINGLE CORE - A bridgeless interleaved power factor correction (PFC) circuit using a single PFC choke having four windings formed on a single core to form the four input inductors of the PFC circuit. An AC-to-DC converter constructed using the bridgeless interleaved PFC circuit achieves high conversion efficiency with high power factor and low total harmonic distortion. Furthermore, the size of the PFC circuit is reduced by using a single PFC choke with quad-winding, | 09-18-2014 |
20140268953 | ACTIVE FRONT END POWER CONVERTER WITH BOOST MODE DERATING TO PROTECT FILTER INDUCTOR - Methods and apparatus are presented for controlling a power converter to protect input filter inductors from overheating, in which an active front end (AFE) rectifier is operated in a boost mode to provide a boosted DC voltage at a derated output current value selected according to the DC bus voltage boost amount corresponding to a maximum load condition for which the filter inductors will not overheat. | 09-18-2014 |
20140268954 | METHODS AND APPARATUS FOR CONTINUOUS AND DISCONTINUOUS ACTIVE RECTIFIER BOOST OPERATION TO INCREASE POWER CONVERTER RATING - Power conversion systems and operating methods are presented in which an active front end rectifier is operated in a boost mode using discontinuous pulse width modulation in a first range of DC bus voltage boost amount, and continuous space vector pulse width modulation is used in a second range, with the ranges being correlated to output derating with respect to filter inductor magnetics in the first range and to rectifier switching loss derating and the second range. | 09-18-2014 |
20140268955 | NO LOAD DETECTION - A power regulation control circuit is implemented as part of a power converter. The power regulation control circuit is implemented during two modes, a sleep mode and a wake-up mode. During the sleep mode, the power regulation control circuit detects a no-load presence and artificially increases the output voltage Vout to its maximum allowable value. This can be accomplished by pulling up an output of an error amplifier that feeds a PWM module. During the wake-up mode while the power converter wakes up from the sleep mode under maximum load, the output voltage Vout sinks from the artificially higher voltage, but still stays above a minimum operational voltage level. A slew rate compensation can be implemented to control a rate at which the output voltage drops when a load is applied. The artificially high output voltage during no-load condition and the slew rate compensation provide open loop voltage adjustment. | 09-18-2014 |
20140268956 | POWER CONVERTER WITH SELF-DRIVEN SYNCHRONOUS RECTIFIER CONTROL CIRCUITRY - An AC-DC power converter is provided with two pairs of self-driven synchronous rectifier switches in addition to, or in place of, diode bridge rectifiers for boosting efficiency and reducing cost. An AC sensing circuit is coupled to AC input terminals, and a DC level shifting circuit applies a DC offset to an AC input signal received via the sensing circuit. A comparator circuit determines positive and negative half waves of the AC input signal relative to the DC offset value. Gate drive signals are provided for driving a first set of parallel rectifier switches during a positive half cycle of the AC input signal, and for driving a second and opposing pair of parallel rectifier switches during a negative half cycle of the AC input signal. In an embodiment, high side gate drive signals may be electrically isolated from the active rectifier control circuitry. | 09-18-2014 |
20140286063 | RECTIFIER AND METHOD FOR CONTROLLING THE SAME - According to one embodiment, a rectifier includes a rectifying device, a control element and a controller. The control element is serially connected to the rectifying device. The control element has a resistance value that changes according to a control signal. The controller generates the control signal according to a change in a current flowing in the rectifying device. | 09-25-2014 |
20140313798 | SWITCH CONTROL DEVICE, POWER SUPPLY DEVICE COMPRISING THE SAME AND DRIVING METHOD OF POWER SUPPLY DEVICE - The present invention relates to a switch controller, a power supply including the same, and a driving method thereof. An AC input of the power supply is connected to a rectification circuit. The power supply includes a power switch to which the AC input passed through the rectification circuit flows during a turn-on period of the power switch and a switch controller detecting a half-on time point that is an intermediate time point of the turn-on period, calculating the AC current using a result of sampling a sense voltage that depends on a current flowing to the power switch during the turn-on period at the half-on time point and the turn-on period, and controlling the input current to have a reference wave. | 10-23-2014 |
20140328096 | ACTIVE POWER FACTOR CORRECTION CIRCUIT FOR A CONSTANT CURRENT POWER CONVERTER - The present disclosure provides techniques for power factor correction on a constant current system. In an example embodiment, the present disclosure provides a power factor correction circuit which receives a constant current power input. The power factor correction circuit provides an input voltage tuned to match the phase of the input current. The input voltage is tuned via charging and draining an input capacitor by a switching device. The switching device is driven on a duty cycle synchronously associated with the input current waveform. | 11-06-2014 |
20140328097 | BRIDGELESS BOOST POWER FACTOR CORRECTION CIRCUIT FOR CONSTANT CURRENT INPUT - The present disclosure provides techniques for power factor correction on a constant current system without the use of a diode rectifier bridge. In an example embodiment, the present disclosure provides a power factor correction circuit which includes two switching MOSFETs biased in opposite directions which operate during opposite half cycles of the input current. The power factor correction circuit generates an input voltage to match the phase of the input current. The input voltage is generated via charging and draining of an input capacitor by the MOSFETs. The MOSFETs are driven on a duty cycle synchronously associated with the input current wave form. | 11-06-2014 |
20140328098 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus includes an isolated converter with efficiency characteristics in which power conversion efficiency of a rated load is higher than power conversion efficiency of a light load and that converts power-supply voltage into direct-current voltage to output the direct-current voltage, a secondary battery that stores the direct-current voltage output from the isolated converter; a voltage detector that detects an amount of charge in the secondary battery; and a controller that switches driving and stopping of the isolated converter on the basis of the detected amount of charge. | 11-06-2014 |
20140334205 | SYNCHRONOUS RECTIFICATION CONTROLLING CIRCUIT AND SYNCHRONOUS RECTIFICATION CONTROLLING METHOD - In one embodiment, a synchronous rectification circuit can include: (i) a sampling circuit configured to sample a voltage across first and second power terminals of a synchronous rectifier, and to generate a first sampling voltage; (ii) an enable controlling circuit configured to delay the first sampling voltage, and to generate a second sampling voltage, and to activate a ramp voltage when the first sampling voltage is higher than the second sampling voltage; (iii) the enable controlling circuit being configured to generate an enable controlling signal in response to a comparison of the ramp voltage against a reference voltage that represents a predetermined light load condition; and (iv) a driving circuit configured to activate a driving signal to turn on the synchronous rectifier when the enable controlling signal and a synchronous rectification open signal are active. | 11-13-2014 |
20140347900 | INTERLEAVED CONVERTER - An interleaved converter configured by connecting a plurality of switching converter circuits in parallel includes an inter-inductor switch that selects whether inductors are connected in series, an input side switch that is connected to a connection point of the inductor and the inter-inductor switch and selects whether electric power is supplied from a rectifier circuit to the inductor side, an output side switch that is connected to a connection point of the inductor and the inter-inductor switch and selects whether electric power is supplied from the inductor to the diode side, and a control circuit that controls the inter-inductor switch, the input side switch, and the output side switch. | 11-27-2014 |
20140369097 | SWITCH MODE POWER CONVERTER HAVING BURST MODE WITH CURRENT OFFSET - A controller for use in a power converter includes a load sensing circuit coupled to output an error signal in response to a feedback signal representative of an output of the power converter. The error signal is representative of a load coupled to an output of the power converter. A burst mode control circuit is coupled to output a burst mode control signal in response to the error signal. An offset current generator circuit is coupled to output an offset current in response to the error signal. A drive circuit is coupled to control switching of a power switch to control a transfer of energy from an input of the power converter to the output of the power converter in response to the error signal, the burst mode control signal, the offset current, and a current sense signal representative of a current through the power switch. | 12-18-2014 |
20150023077 | INTERLEAVED TWO-STAGE POWER FACTOR CORRECTION SYSTEM - Methods and systems are described for providing power factor correction for high-power loads using two interleaved power factor correction stages. Each power factor correction stage includes a controllable switch that is operated to control the phasing of each power factor correction stage. The phasing of output current from the second power factor correction stage is shifted 180 degree relative to the output current from the first power factor correction stage. | 01-22-2015 |
20150049529 | CONTROL METHOD FOR RECTIFIER OF SWITCHING CONVERTERS - A control device for a transistor of a switching converter rectifier generates a control signal of the transistor and comprises a circuit to measure the conduction time of the body diode of the transistor cycle by cycle. When the conduction time is greater than a first threshold, the off time instant of the transistor is delayed by a first quantity in the next cycles, until the conduction time is less than the first threshold and greater than a second threshold. When the conduction time is between the first and second thresholds, the off time instant is delayed by a fixed second quantity in the next cycles until the conduction time is lower than the second threshold, with the second quantity less than the first quantity. When the conduction time is lower than the second threshold, the off time instant is advanced by the second quantity in the next cycle. | 02-19-2015 |
20150062985 | PRE-DISTORTION OF SENSED CURRENT IN A POWER FACTOR CORRECTION CIRCUIT - An example controller includes a power factor enhancer, an on-time controller, and a switching signal generator. The power factor enhancer is coupled to generate a pre-distortion signal each half-line cycle of an ac input voltage of a PFC converter. The on-time controller ends an on-time of a PFC switch in response to a sensed PFC switch current of the PFC converter multiplied by the pre-distortion signal. The switching signal generator controls an input current waveform of the PFC converter to substantially follow a shape of an input voltage waveform by generating a switching signal in response to the on-time controller to control switching of the PFC switch. The power factor enhancer adjusts the pre-distortion signal to pre-distort the sensed PFC switch current to compensate for distortion in the input current waveform. | 03-05-2015 |
20150062986 | POWER FACTOR CORRECTION CIRCUIT - Provided is a power factor correction circuit correcting a power factor of AC voltage. The power factor correction circuit includes: a rectifying unit stopping rectifying the AC voltage in a transient state and generating an rectified voltage by rectifying the AC voltage in a steady state; a power factor correction unit generating a power-factor-corrected voltage by correcting the rectified voltage; a smoothing unit generating a smoothed voltage by smoothing the power-factor-corrected voltage; and an inrush current limiting unit providing a limited current by limiting an inrush current generated by the AC voltage in the transient state and stopping providing a current to the smoothing unit. | 03-05-2015 |
20150062987 | LOAD DRIVING CIRCUIT AND METHOD THEREOF - In one embodiment, a method of driving a load can include: monitoring an AC input to a rectifier circuit in real-time, where the rectifier circuit can include first and second rectifier circuits, and controlling first and second controllable switches based on a state of the AC input is in a first state. For example, a first state can include the AC input being in a positive half cycle and increasing, or the AC input being in the positive half cycle and decreasing while being at least as high as a predetermined threshold value. The AC input can be used to supply power to a load circuit and an output capacitor via the first rectifier circuit when the AC input is in the first state, where the first rectifier circuit can include a first diode and the second controllable switch. | 03-05-2015 |
20150070954 | CONTROLLER HAVING ADJUSTABLE FREQUENCY-REDUCTION FUNCTION AND SYSTEM USING SAME - A controller having adjustable frequency-reduction function for a power conversion application, comprising: a threshold voltage sampling unit, having a first node coupled to an external resistor network for generating a threshold voltage at the first node, which is then sampled by the threshold voltage sampling unit; a PWM unit having a second node for receiving a feedback voltage from a load, and a third node for providing a PWM signal of a switching frequency; and a driver unit for driving an external power transistor according to the PWM signal; wherein the switching frequency starts to decrease from a first frequency when the feedback voltage falls below a first threshold voltage, which is a first function of the threshold voltage. | 03-12-2015 |
20150078048 | POWER DETECTING CIRCUIT - A power detecting circuit for a power supply module is disclosed. The power detecting circuit includes a current detecting module, a micro control unit (MCU), a correcting circuit. The current detecting module is electrically coupled to the power supply module and configured to detect an output current value of the power supply module. The micro control unit (MCU) is electrically coupled to the current detecting module. The correcting circuit is electrically coupled to the MCU and configured to correct the output current value of the power supply module. The MCU is configured to calculate an output power value of the power supply module according to the output current value and a preset output voltage value or a tested output voltage value of the power supply module and display the output power value via a display module. | 03-19-2015 |
20150092463 | POWER SUPPLY APPARATUS - Embodiments of the invention provide a power supply apparatus, including an AC/DC rectifying unit converting an AC voltage into a DC voltage, a power factor correction unit correcting a power factor of the DC voltage, and a DC/DC conversion unit converting the DC voltage having the corrected power factor into a DC voltage having a different magnitude therefrom. According to various embodiments, the power supply apparatus further includes an auxiliary winding connected to a primary side winding of a transformer of the DC/DC conversion unit and generating the DC voltage having a predetermined magnitude, and an internal power generation unit connected to an output terminal of the power factor correction unit and the auxiliary winding and using a voltage of the output terminal of the power factor correction unit and a voltage generated by the auxiliary winding to generate temporary Vcc power and supply the generated temporary Vcc power as internal power of the power factor correction unit. | 04-02-2015 |
20150138857 | METHOD FOR ESTIMATING POWER OF A POWER CONVERTER - A controller for estimating a power of a power converter and method of estimating the same has been introduced herein. In one embodiment, the controller includes an analog/digital converter configured to provide samples of a rectified voltage waveform corresponding to a rectified sensed voltage of the power converter. The controller also includes a processor configured to estimate a minimum value of the rectified voltage waveform in accordance with the samples and remove an offset from the rectified voltage waveform to obtain an unbiased rectified voltage waveform in accordance with the estimate of the minimum value. The controller is also configured to obtain an unbiased rectified current waveform corresponding to sensed current of the power converter and provide an average power of the power converter. | 05-21-2015 |
20150303790 | POWER FACTOR CORRECTION CIRCUIT WITH DIGITAL CONTROL SCHEME AND ASSOCIATED CONTROL METHOD - A PFC circuit having a switching circuit and a control circuit, the control circuit controls an operation mode of the switching circuit based on an input current and a switching frequency of the switching circuit, when the switching circuit works under a continuous current mode, the switching circuit is turned ON when the input current is less than an OFF current reference signal, and when the switching circuit works under a first discontinuous mode or a second discontinuous mode, the switching circuit is turned ON after a turn ON delay time period when the input current is less than the OFF current reference signal. | 10-22-2015 |
20150303823 | POWER SUPPLY CIRCUIT - A power supply circuit ( | 10-22-2015 |
20150311816 | SWITCHING POWER SUPPLY CIRCUIT CONTROL METHOD - When power consumption of a load is smaller than a first threshold, a switch element of each of one or more circuits is made nonconductive to supply power from all of the one or more circuits to the load. When the power consumption of the load is larger than the first threshold, the switch element of at least one of the one or more circuits is made intermittently conductive to supply power from all of the one or more circuits to the load. | 10-29-2015 |
20150318780 | Bridgeless PFC Using Single Sided High Frequency Switching - A new converter topology and control methods are presented that can be used for bridge less power factor conversion that are simple and do not introduce large common mode noise. | 11-05-2015 |
20150333654 | MODULAR MULTI-LEVEL CONVERTER - Provided is a modular multi-level converter (MMC) including a plurality of sub-modules including switching elements, and a central control unit which assigns an address to each of the plurality of sub-modules for distinguishing each of the plurality of sub-modules, determines switching operation conditions of the plurality of sub-modules based on the assigned addresses, and outputs switching signals corresponding to the determined switching operation conditions. The central control unit determines a switching sequence of the plurality of the sub-modules according to the sequence of the assigned addresses. | 11-19-2015 |
20150333655 | VOLTAGE ADJUSTING APPARATUS - In a voltage adjusting apparatus connected in series to a system, an output of an AC/DC converter thereof is reduced. | 11-19-2015 |
20150357910 | DC POWER SUPPLY CIRCUIT - In a DC power supply circuit ( | 12-10-2015 |
20150357930 | SYSTEMS AND METHODS FOR CONTROLLING ACTIVE RECTIFIERS - A method of controlling a rectifier includes receiving a gain factor, receiving a ramp interval, and generating a rectifier switch control voltage. The rectifier switch control voltage is an over-modulated rectifier switch control voltage generated by a pulse width modulator using the gain factor. The amount of over-modulation in the rectifier switch control voltage is decreased during the ramp interval for reducing transient voltage overshoot events at the start of active rectification. | 12-10-2015 |
20150357931 | CONVERTER - A voltage source converter ( | 12-10-2015 |
20150357932 | EFFICIENCY DYNAMIC POWER CONVERTER - 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. | 12-10-2015 |
20150357941 | VOLTAGE SOURCE CONVERTER COMPRISING A CHAIN-LINK CONVERTER - A voltage source converter comprises: at least two converter limbs, each converter limb extending between DC terminals and having limb portions separated by an AC terminal. Each limb portion includes at least one switching element and at least one chain-link converter including series-connected modules. Each module includes at least one switching element and at least one energy storage device that combine to selectively provide a voltage source. The chain-link converter(s) form a branch to interconnect two AC terminals. Each limb portion is switchable to switch the corresponding chain-link converter(s) into and out of circuit with a respective DC terminal. The chain-link converter(s) is switchable to control the configuration of an AC voltage at each corresponding AC terminal. The converter further includes a control unit that coordinates the switching of the limb portions and the chain-link converter(s) to cause transfer of real power between the AC and DC electrical networks. | 12-10-2015 |
20150372614 | AC-DC CONVERTER - An AC to DC converter is provided with: a rectifier circuit that rectifies an AC voltage generated by an AC voltage source; and a plurality of switching units that collectively receive an output voltage of the rectifier circuit through an inductor, and that are connected in series at an input side, each of the switching units having a semiconductor switching device, a diode, and a capacitor, and performing ON/OFF switching of the semiconductor switching device provided therein to step up a voltage received from the rectifier circuit, each of the switching units supplying the stepped-up voltage to the capacitor through the diode so that a resulting DC across the capacitor can be provided, as a DC output voltage of the switching unit, to a respective load to be connected to terminals of the capacitor. | 12-24-2015 |
20150381072 | SWITCHING POWER SUPPLY CIRCUIT - Zero-voltage switching of a switching element (Q | 12-31-2015 |
20160006364 | SYSTEM AND METHOD FOR CONTROLLING PCS VOLTAGE AND FREQUENCY - The present invention discloses a system and a method for controlling PCS voltage and frequency, wherein the system comprises a reference voltage converter, a phase-locked loop, a grid-side voltage converter, a voltage transformer, a first proportional integral controller, a second proportional integral controller, a coordinate converter and a SVPWM generator; a reference voltage converter is connected to an output terminal of a the phase-locked loop, and the output terminal of the phase-locked loop is further connected to a grid-side voltage converter; the grid-side voltage converter is connected to a high-voltage side of an isolating transformer of the electric grid via the voltage transformer; two output terminals of the grid-side voltage converter are respectively connected to the coordinate converter via two proportional integral controllers; an output terminal of the coordinate converter is connected to the SVPWM generator; an output terminal of the SVPWM generator is connected to a power switch of the electric grid. A PWM control signal for controlling the power switch of the electric grid is generated by the reference voltage converter, the phase-locked loop, the grid-side voltage converter, the voltage transformer, the two proportional integral controllers, the coordinate converter and the SVPWM generator. The system and method for controlling PCS voltage and frequency according to the invention have the advantages that the PCS can realize voltage and frequency buildup in an off-grid state and can stably output an expected voltage and frequency. | 01-07-2016 |
20160006365 | High-Frequency, High Density Power Factor Correction Conversion For Universal Input Grid Interface - A circuit includes a reconfigurable rectifier, a voltage balancer, and a pair of converters. The reconfigurable rectifier includes an ac input port and three output ports. In a first configuration, the reconfigurable rectifier can deliver power at a first output port and, in a second configuration, to at least a second output port. The voltage balancer includes first and second ports coupled to second and third output ports of the reconfigurable rectifier and is configured to balance received voltage at the first and second ports. The first converter has an input coupled to the first port of the voltage balancer and an output at which a first converted voltage signal is provided. The second converter has an input coupled to the second port of the voltage balancer and an output at which a second converted voltage signal is provided. | 01-07-2016 |
20160013730 | RECTIFIER CIRCUIT FOR CONVERTING AC VOLTAGE INTO RECTIFIED VOLTAGE | 01-14-2016 |
20160020692 | CONTROL CIRCUIT IMPLEMENTING A RELATED METHOD FOR CONTROLLING A SWITCHING POWER FACTOR CORRECTOR, A PFC AND AN AC/DC CONVERTER - A control circuit controls a switching power factor corrector based on switch off-time modulation by controlling the input electric charge during on-time. The circuit includes a charge current generator that generates charge current as a replica of a current sense signal amplified with a gain corresponding to the square of peak value of a rectified input voltage, a loop capacitor charged with the charge current during on-time intervals and discharged with a discharge current during off-time intervals, a discharge current generator that generates the discharge current proportional to a product of a comparison voltage and a difference between a regulated output voltage and the rectified input voltage, and a PWM modulator that senses a charge voltage of the loop capacitor, turns on the switch for an on-time duration in response to detecting that the charge voltage nullifies, and turns off the switch when the on-time duration has elapsed. | 01-21-2016 |
20160028304 | BOOST INDUCTOR DEMAGNETIZATION DETECTION FOR BRIDGELESS BOOST PFC CONVERTER OPERATING IN BOUNDARY-CONDUCTION MODE - A bridgeless converter includes a boost inductor connected in series with an alternating-current power source, a first series circuit including a first switching device and a second switching device connected in series with each other, a second series circuit including a third switching device and a fourth switching device connected in series with each other, a capacitor connected in parallel with the first series circuit and the second series circuit, and a magnetization sensing circuit including at least one auxiliary winding inductively coupled to the boost inductor. | 01-28-2016 |
20160028322 | POWER SUPPLYING SYSTEM, LINEAR CONTROLLING MODULE THEREOF, AND CONTROLLING METHOD OF SWITCHING COMPONENT - The linear controlling module of the present invention includes a controlling switch, a first resistor, a capacitor, and a second resistor. The controlling switch is electrically connected to a controlling signal outputting terminal of a power supplying device, the first resistor is electrically connected to the controlling switch, the capacitor is electrically connected to a electric power outputting terminal of the power supplying device and the first resistor, and the second resistor is electrically connected to the switch component of the power supplying device, the first resistor, and the capacitor. The switch component is electrically connected to an electric power outputting terminal. | 01-28-2016 |
20160036345 | LOAD DRIVING CIRCUIT AND METHOD THEREOF - In one embodiment, a method of driving a load can include: monitoring an AC input to a rectifier circuit in real-time, where the rectifier circuit can include first and second rectifier circuits, and controlling first and second controllable switches based on a state of the AC input is in a first state. For example, a first state can include the AC input being in a positive half cycle and increasing, or the AC input being in the positive half cycle and decreasing while being at least as high as a predetermined threshold value. The AC input can be used to supply power to a load circuit and an output capacitor via the first rectifier circuit when the AC input is in the first state, where the first rectifier circuit can include a first diode and the second controllable switch. | 02-04-2016 |
20160043658 | ISOLATED TRANSFORMER-LESS CAPACITIVE POWER SUPPLY - An isolated transformer-less capacitive power supply, and methods for using the same to generate power, are disclosed. The power supply includes first and second input terminals to receive an alternating current (AC) voltage. The power supply also includes first rectifier circuitry coupled to the first and second input terminals. The first rectifier circuitry is configured to generate a first direct current (DC) voltage. The power supply also includes second rectifier circuitry, including a first capacitor and a second capacitor coupled to the first and second input terminals, respectively. The second rectifier circuitry is configured to receive the AC voltage via the first capacitor and the second capacitor and to generate a second DC voltage concurrently with the generation of the first DC voltage. | 02-11-2016 |
20160056730 | CONVERTER, CONTROLLER, AND CONTROL METHOD - A control method for a power converter is provided. The power converter includes an inductor, and a switch selectively turned on according to a control signal. The control method includes determining an on-time and a falling time according to a voltage information or a current information of the power converter; determining a switching period of the control signal according to the on-time, the falling time, and a resonant period corresponding to the inductor and a parasitic capacitance of the switch; adjusting the switching period by comparing the switching period with a first threshold period and a second threshold period; generating the control signal having the switching period when the switching period is greater than the first threshold period and less than the second threshold period or when the switching period is greater than the second threshold period and the power converter operates at over 50% of a rated power. | 02-25-2016 |
20160065054 | POWER FACTOR CORRECTION IN POWER CONVERTER - Aspects of the present disclosure are directed to method, circuits, and apparatuses for power conversion. In an example embodiment, an apparatus includes a boost converter having a current loop affected by at least one compensation correction parameter and variation in an inductance of the current loop. The apparatus also includes a power factor correction means, including a circuit, configured and arranged to adaptively modify the compensation correction parameter based on variation in the inductance of the current loop. | 03-03-2016 |
20160065056 | DELTA CONVERSION RECTIFIER - According to one aspect, embodiments of the invention provide an AC-DC rectifier comprising an input configured to receive input AC power from an AC power source having an input AC voltage waveform, an output configured to provide output DC power to a load, an active power filter coupled to the input, an inverter coupled to the input and configured to convert the input AC voltage waveform into an output AC voltage waveform at a desired magnitude, a rectifier portion coupled between the inverter and the output and configured to convert the output AC voltage waveform into the output DC power, and a controller coupled to the active power filter and the inverter and configured to operate the active power filter to provide Power Factor Correction (PFC) at the input and to operate the inverter to provide the output AC voltage waveform at the desired magnitude to the rectifier portion. | 03-03-2016 |
20160072403 | PWM RECTIFIER INCLUDING CAPACITANCE CALCULATION UNIT - A PWM rectifier includes a main circuit unit carrying out AC-DC power conversion by PWM-control, a PWM control unit PWM-controlling the main circuit unit, a DC voltage detection unit detecting a DC voltage across a smoothing capacitor connected to the DC-side of the main circuit unit, a DC voltage storage unit storing respective DC voltages at the start and end times of an initial boost period during which the smoothing capacitor having been charged to an AC voltage peak value is further charged to a higher voltage, an input power calculation unit calculating input power flowing in from the AC-side based on an AC voltage and current, an integral power calculation unit calculating integral power from the input power over the initial boost period, and a capacitance calculation unit calculating the capacitance of the smoothing capacitor based on the respective DC voltages and the integral power. | 03-10-2016 |
20160094145 | REDUCING OUTPUT VOLTAGE UNDERSHOOT IN ISOLATED POWER CONVERTERS - A power converter controller controls a power stage to produce a regulated voltage at a converter output node, using an input signal. A circuit uses an opto-coupler circuit that has an input node connected to a compensation circuit, to generate the input signal. The compensation circuit has a shunt regulator having an output that is connected to the opto-coupler circuit through series-connected first and second current limiting elements. An input of the shunt regulator is connected to the converter output node. A feedback element has one end connected between the series-connected current limiting elements and another end connected to the input of the regulator. Other embodiments are also described and claimed. | 03-31-2016 |
20160118908 | ARRANGEMENT, METHOD AND COMPUTER PROGRAM PRODUCT CONCERNED WITH TAPPING OF POWER FROM A DC POWER LINE TO AN AC POWER LINE - An arrangement for tapping power from a DC power line to an AC power line includes power transfer modules between two DC potentials, each including a first branch with a string of converter cells in parallel with a second branch including a capacitor and being connected to an AC phase. There is at least one control unit that controls the arrangement considering one or more of a) distributing appropriate AC and DC voltages in converter output voltages of all series connected modules, b) maintaining/setting cell capacitor voltages in specific range and allowing boost mode operation, c) performing possible balancing of the introduced capacitor and d) employing an alternate approach of using passive filters to mitigate low order harmonics. | 04-28-2016 |
20160126858 | INPUT FILTER PRE-CHARGE FED BY A MEDIUM-VOLTAGE GRID SUPPLY - A device includes a transformer configured to supply a pre-charge voltage to a capacitor and a converter configured for coupling to the transformer and responsive to an increasing modulation index. The modulation index increases for a time quanta after the capacitor becomes substantially fully charged and the pre-charge voltage is substantially constant during the time quanta. | 05-05-2016 |
20160141976 | Electrical Conversion - An electrical conversion apparatus is described which comprises a bridge rectifier | 05-19-2016 |
20160149511 | DRIVER CONTROLLER WITH INTERNALLY CALCULATED AVERAGE OUTPUT CURRENT - Methods, devices, and integrated circuits are disclosed for a driver controller that internally calculates average output current. In one example, a method includes receiving an output voltage of an output line. The method further includes performing a calculation of an average output current at the output line based at least in part on the output voltage. The method further includes controlling an interval timing of a switch based at least in part on the calculation of the average output current at the output line, wherein the switch is configured for switching current to the output line. | 05-26-2016 |
20160164430 | VOLTAGE DETECTION CIRCUIT AND A METHOD OF DETECTING VOLTAGE CHANGES - A power conversion system and a method for voltage change detection, specifically, relates to a detection circuit implemented in the AC-DC power converter, detect the voltage change. The AC input voltage is rectified to convert into a DC input voltage transmitted to a detection unit generating a detection voltage signal at different logical states corresponding to the input voltage changes. A charge current source unit is used for charging the capacitor when the detection voltage signal is in a second state and a discharge current source unit is used for discharging the capacitor when the detection voltage signal is in a first state. A primary comparator compares the voltage changes of the capacitor in the alternating charge and discharge processes with a critical zero potential and outputs a detection signal identifying the changing trend of the input voltage. | 06-09-2016 |
20160172996 | RECTIFICATION DEVICE | 06-16-2016 |
20160204713 | MULTILEVEL ACTIVE RECTIFIERS | 07-14-2016 |
20160204715 | CAPACITOR INPUT TYPE SMOOTHING CIRCUIT | 07-14-2016 |
20160380553 | ENERGY-SAVING POWER SUPPLY APPARATUS - An energy-saving power supply apparatus includes a bridge rectifier, a diode bypass circuit and a control circuit. The diode bypass circuit is electrically connected to the bridge rectifier. The control circuit is electrically connected to the diode bypass circuit and the bridge rectifier. The bridge rectifier includes a plurality of diodes. After the control circuit receives a power start signal, the control circuit is configured to control the diode bypass circuit, so that a part of the diodes are bypassed to save energy. | 12-29-2016 |
20160380555 | SYNCHRONOUS RECTIFIER AND CONTROL CIRCUIT THEREOF - A synchronous rectifier includes: a rectifying circuit including transistors, the rectifying circuit being configured to generate rectified power by rectifying input power input to an input terminal of the rectifying circuit depending on switching operations of the transistors, and output the rectified power to an output terminal of the rectifying circuit; and a controller configured to apply a gate signal to each of the, and adjust a pulse width of the gate signal depending on a difference between the input power and the gate signal. | 12-29-2016 |
20190149038 | POWER FACTOR IMPROVEMENT DEVICE | 05-16-2019 |
20190149061 | Power source device of electric tool | 05-16-2019 |