Entries |
Document | Title | Date |
20080225559 | SWITCHING-MODE POWER SUPPLY - A switching-mode power supply is configured so that two power supply lines are connected with each other via a series circuit consisting of a main switching element, a switch, and a transformer. The switching-mode power supply further includes a ripple voltage detecting circuit for detecting that a ripple voltage in one power supply line has a predetermined amount or more when a half short-circuit occurs in the main switching element. When the ripple voltage detecting circuit detects that the ripple voltage has a predetermined amount or more, the switch is opened so as to block supply of a current (supply of a voltage) to the main switching element. This allows the switching-mode power supply to avoid, with a simple circuit configuration and low costs, being an unstable state when the half short-circuit occurs in the main switching element. | 09-18-2008 |
20080239771 | Asymmetrical Interleaving Strategy for Multi-Channel Power Converters - In a power converter having m=two or more channels of power factor correction (PFC) circuits connected in parallel and an electromagnetic interference (EMI) filter connected in series therewith, phase shifts in switching between the respective PFC channels can allow increase of EMI filter corner frequency allowing reduction of size and cost of the EMI filter at some switching frequencies. Asymmetrical phase shifts (other than 360°/m) such as 360°/2m and other phase shifts and variations in m allow increase of EMI filter corner frequency at switching frequencies where symmetrical, 360°/m phase shifts provide no benefit to EMI filter design by providing cancellation or partial cancellation of different harmonics of the switching noise; which cancellation may be arranged to be complementary to the EMI filter function at more than one peak of the noise spectrum. (Such asymmetrical phase shifts do not significantly increase ripple and consequent switching noise). Alteration of m and corresponding alteration of phase shift may be performed adaptively for purposes of improving efficiency at light loads and the like. | 10-02-2008 |
20080247197 | ONE-WAY DIPOLAR COMPONENT WITH A PROTECTION AGAINST OVERCURRENT - A one-way dipolar component with overcurrent protection including, in parallel, a first one-way dipolar component with a positive temperature coefficient; and a second one-way dipolar component having the same biasing as the first one-way dipolar component having a conduction threshold voltage greater than the conduction threshold voltage at ambient temperature of the first one-way dipolar component, the second component comprising a silicon diode in series with a component of a zener diode type. | 10-09-2008 |
20080253153 | Active Power Conditioner - An active power conditioner includes a first power electronic switch set, a second power electronic switch set, a third power electronic switch set, an input filter and an output filter. The active power conditioner can supply a stable AC voltage to a load when a voltage variation is occurred at an AC power source by controlling either the second power electronic switch set or the third power electronic switch set via high-frequency switching, and the other power electronic switch sets that are not switched in high frequency are controlled to switch in low-frequency switching. | 10-16-2008 |
20080285315 | POWER SUPPLY APPARATUS AND ELECTRONIC DEVICE HAVING THE POWER SUPPLY APPARATUS - A power supply to improve an EMI characteristic and an electronic device having the power supply. The power supply includes a power converter to convert an alternating current (AC) power applied from outside to a direct current (DC) power, a ground portion to supply a ground power to the power converter and a noise attenuator to reduce noise by blocking a harmonic current generated by a driving of the power converter from passing through the ground portion. Accordingly, the stable ground power can be supplied to the internal elements by avoiding the potential change of the ground power and the noise caused by the flow of the harmonic current can be reduced by shortening the harmonic current path. Therefore, the EMI characteristic can be improved. | 11-20-2008 |
20090122580 | THYRISTOR POWER CONTROL CIRCUIT - A thyristor power control circuit reduces EMI and maintains a holding current in the thyristor to prevent flickering at a load. The power control circuit includes a thyristor configured to receive an input AC voltage, and responsive to a gate pulse generates a modified AC voltage. A rectifier receives the modified AC voltage and generates a rectified DC voltage. A power converter coupled to the rectifier receives the rectified DC voltage and generates a controlled output current. A damping circuit coupled to an output terminal of the rectifier includes a damping resistor for maintaining the holding current in the thyristor during an ON period of the thyristor. The damping circuit includes a first capacitor coupled in series to the damping resistor and a diode coupled in parallel to the damping resistor. The diode enables the first capacitor to discharge without causing power loss at the damping resistor. | 05-14-2009 |
20090231889 | METHOD AND APPARATUS FOR AC TO DC POWER CONVERSION WITH REDUCED HARMONIC CURRENT - A method and apparatus are disclosed for controlling a buck converter. In one aspect, an integrator is coupled to receive a current sense signal representative of a current in a switch of the buck converter and to integrate the current sense signal to produce a first input signal. A ramp generator is coupled to receive an oscillating signal having a same switching period as the switch, and to generate a piecewise linear ramp signal in response to the oscillating signal. The piecewise linear ramp signal has a delay segment of substantially zero slope followed by a plurality of segments having finite linear slopes within the switching period of the switch. A multiplier multiplies the piecewise linear ramp signal to produce a second input signal and a drive signal generator is coupled to receive a third input signal generated in response to the first and the second input signals to produce a drive signal to be coupled to control the switch to substantially regulate an output voltage of the buck converter | 09-17-2009 |
20090231890 | Boost converter input ripple current reduction circuit - A boost inductor value reduction circuit is integrated into a traditional boost power converter to greatly reduce undesirable high frequency harmonics from being fed back to the input side of the boost power converter. The boost inductor value reduction circuit is very small when compared with traditional filter techniques, is less costly than traditional filter techniques, and does not degrade the boost power converter control performance. It can also be used to reduce the size of the boost inductor without compromising the converter performance for use in energy efficient sensitive applications such as photovoltaic inverters. | 09-17-2009 |
20090231891 | REACTOR ARRANGEMENT FOR ALTERNATING ELECTRICAL CURRENT - A reactor arrangement for alternating electrical current includes different coils ( | 09-17-2009 |
20090251932 | Low Harmonic Rectifier Circuit - A method, device, and plurality of circuit enhancements for a rectifier system that enable reduction in lower order and higher order harmonics, without substantially reducing the rectifier's direct current output voltage. The rectifier system comprises a phase shifting primary transformer subsystem and a multi-pulse rectifier. At least one series impedance path is coupled to one of three input terminals/leads of the transformer subsystem and conducts one phase of three phase currents from a power supply to the transformer subsystem. The series impedance path provides low impedance to the 1 | 10-08-2009 |
20090316450 | POWER SUPPLY DEVICE WITH SYSTEM SWITCH CIRCUIT - A power supply device with a system switch circuit includes a primary power system, a stationary power system and a power management unit. The power management unit is triggered by a remote ON/OFF signal to generate a bias voltage power for turning on the primary power system after obtaining a stationary power. The system switch circuit is triggered by the remote ON/OFF signal to interrupt the stationary power system from obtaining an electric power path of an input power or a reference frequency signal to interrupt the stationary power, and triggered by the remote ON/OFF signal again to conduct the stationary power system to obtain the electric power path of the input power or the reference frequency signal to generate the stationary power, so as to achieve the effects of reducing a power loss as well as maintaining a normal operation of the power supply device. | 12-24-2009 |
20100020574 | Power Adapter and Conversion Method - A power adapter and conversion method for converting an alternating voltage to a direct voltage supplied to a load are provided. The power conversion method includes the following steps. The alternating voltage is received and filtered to generate a filter voltage. The filter voltage is received and rectified to generate a rectified voltage. A bulk capacitor is provided for receiving the rectified voltage to generate an output voltage. A transformer having a primary side and a secondary side is provided. The primary side is coupled to a bulk capacitor to receive the output voltage. The secondary side generates the direct voltage and is coupled to the load. The alternating voltage is detected. When the alternating voltage is greater than a predetermined value, a circuit between the bulk capacitor and the alternating voltage is broken. | 01-28-2010 |
20100182811 | POWER CONVERTER - The present invention discloses a power converter with extremely low standby power consumption for converting an input AC power to an output DC power, comprising: a DC supply voltage generating unit, used for generating a DC supply voltage; a pulse width modulation controller, used for generating a pulse width modulation signal according to a feedback voltage of the output DC power; and an isolated actuating switch, placed between the DC supply voltage generating unit and the pulse width modulation controller, for controlling the supply of the DC supply voltage to the pulse width modulation controller, according to a switch signal from a loading device. | 07-22-2010 |
20100182812 | POWER CONVERTER - The present invention discloses a power converter with low standby power consumption, used to convert an AC input power to an output DC power, comprising: an EMI filter, coupled to the AC input power to filter the EMI; a TRIAC, coupled to the EMI filter to access the AC input power; and a TRIAC driver, used for driving the gate of the TRIAC switch according to an on-off control signal from a loading device, to control the conduction of the TRIAC switch. | 07-22-2010 |
20110013430 | POWER SUPPLY APPARATUS AND ELECTRONIC DEVICE HAVING THE POWER SUPPLY APPARATUS - A power supply to improve an EMI characteristic and an electronic device having the power supply. The power supply includes a power converter to convert an alternating current (AC) power applied from outside to a direct current (DC) power, a ground portion to supply a ground power to the power converter and a noise attenuator to reduce noise by blocking a harmonic current generated by a driving of the power converter from passing through the ground portion. Accordingly, the stable ground power can be supplied to the internal elements by avoiding the potential change of the ground power and the noise caused by the flow of the harmonic current can be reduced by shortening the harmonic current path. Therefore, the EMI characteristic can be improved. | 01-20-2011 |
20110019442 | POWER CONVERTER - The noise generated from a power converter is suppressed by increasing the noise frequency to a level not lower than the maximum frequency of the human audible range. To obtain the frequency of an output current harmonic component as a noise source which has exceeded the maximum frequency of the human audible range, it is adequate to determine that the frequency of a driving carrier wave for the individual converter cells in the power converter, in which the phases of the carrier wave for the converter cells are mutually shifted by a given value between the converter cells, meets the following equation. | 01-27-2011 |
20110019443 | SERIES VOLTAGE COMPENSATOR AND METHOD FOR SERIES VOLTAGE COMPENSATION IN ELECTRICAL GENERATORS - Series voltage compensator connected in series between an electrical generator and an electrical grid that comprises a filter and an electronic power converter per phase. The compensator generates a voltage to dynamically compensate for sudden voltage drops in the electrical grid, with it being additionally possible to control the angle of the voltage in relation to the current with the aim of controlling the reactive power injected (or absorbed) by the series voltage compensator to the grid. | 01-27-2011 |
20110096576 | POWER FACTOR CORRECTION DEVICE AND CONTROL METHOD THEREOF - Proposed are a power factor correction device and its control method capable of obtaining a stable output as the output of a power supply unit while simplifying and miniaturizing the configuration. In the power factor correction device and the control method thereof including a coil and a switching element, and a control unit for controlling ON/OFF of the switching element, provided are an input voltage detection unit for detecting an input voltage of the power factor correction device, an output voltage detection unit for detecting an output voltage, and a coil current detection unit for detecting a coil current that is generated in the coil pursuant to the ON/OFF operation of the switching element. The control unit predicts an OFF time of the switching element of each switching cycle for controlling the switching element in a critical mode based on a voltage value of the input voltage detected with the input voltage detection unit, a voltage value of the output voltage detected with the output voltage detection unit, and a current value of the coil current detected with the coil current detection unit, and controls the ON/OFF of the switching element based on the prediction result. | 04-28-2011 |
20110096577 | POWER CONVERSION APPARATUS - A power conversion apparatus has a rectification circuit provided for converting AC power supplied from an AC power supply into DC power. The rectification circuit has a configuration in which series circuit whose number corresponds to the number of phases of an input AC are connected in parallel between a positive-side line and a negative-side line. The AC power supply is connected to AC input points, each corresponding to a connection point between a rectifying device and a semiconductor switching device in each of the series circuits, and connected to a point having ground potential through noise suppressing series circuits respectively. In each of the noise suppressing series circuits, a switch unit and a capacitor are connected in series. In this manner, it is possible to provide a power conversion apparatus which can reduce a noise terminal voltage while solving problems in volume and cost simultaneously. | 04-28-2011 |
20110110127 | POWER FACTOR CORRECTION CIRCUIT - The present invention relates to a power factor correction circuit that can reduce distortion of input current in a switching mode power supply. The power factor correction circuit provided in the present invention basically comprises a first inductor which is electrically connected at a first end thereof to an input terminal, a second coil that is coupled to the first inductor to form an induced voltage, a switch electrically connected to the a second terminal of the first inductor, and a switching control unit for controlling turn-on and turn-off of the switch. In such a power factor correction circuit of the present invention, the switching control unit is configured to differently set a turn-on period of the switch depending on the input voltage by generating a signal for controlling the turn-off of the switch using a second coil voltage induced at the secondary coil of the inductor by input voltage or a directly sensed input voltage. Accordingly, distortion of input current can be effectively corrected. | 05-12-2011 |
20110188273 | POWER FACTOR CORRECTION STAGE - A power factor correction stage comprising: an input terminal configured to receive an input signal; an output terminal configured to provide an output signal; a first converter stage and one or more further converter stages, wherein each of the converter stages is connected to the input terminal and the output terminal, and each converter stage comprises a switch; and a controller configured to operate the switches of the converter stages. The controller is configured to operate the switch of the one or more further converter stages at a period of time after operation of the switch of the first converter stage for a current switching cycle, wherein the period of time corresponds to a proportion of the switching frequency for an earlier switching cycle that does not correspond to substantially the period of the earlier switching cycle divided by the number of converter stages. | 08-04-2011 |
20120026761 | ADAPTIVE CURRENT LIMITER AND DIMMER SYSTEM INCLUDING THE SAME - In an embodiment, an adaptive current limiter includes a sense element, a current pass element, and a controller. The sense element includes a first sense terminal coupled to a power supply terminal and a second sense terminal. The sense element generates a sense voltage in response to a feedback current. The current pass element includes a first terminal for receiving the feedback current, a second terminal coupled to the second sense terminal, and a control terminal. The controller is coupled to the sense element and to the control terminal for adjusting the feedback current conducted by the current pass element based on the sense voltage and a time-varying voltage signal. | 02-02-2012 |
20120069611 | Correction Circuit of a Switching-Current Sample for Power Converters in Both CCM and DCM Operation - The present invention provides a correction circuit for a power converter. The correction circuit includes a sampling circuit, a demagnetizing-time circuit, a duty circuit, and a compensation circuit. The sampling circuit generates an average-current signal in response to a switching current of the power converter. The demagnetizing-time circuit generates a discharging-time signal in response to a switching signal and an input-voltage signal. The duty circuit generates a duty signal in response to the discharging-time signal, an on-time of the switching signal, and a switching period of the switching signal. The compensation circuit is coupled to receive the average-current signal and the duty signal for generating a corrected signal. The switching signal is utilized to switch a magnetic device for regulating an output voltage of the power converter. The corrected signal is coupled to generate the switching signal. | 03-22-2012 |
20120087160 | POWER FACTOR CORRECTION CIRCUIT - There is provided a power factor correction circuit capable of correcting a power factor of a power converting module through increasing an input current by switching a main switching element of a power converting module on the basis of a first reference wave having a slope based on a first signal and an error voltage, in particular, by limiting a switching frequency on the basis of a first reference wave having a slope based on a second signal lower than a first signal and an error voltage when the switching frequency of the main switching element increases because an input voltage of the power converting module is low. | 04-12-2012 |
20120092907 | POWER SUPPLY AND SYSTEM - The invention provides a power supply comprising a switch, a voltage detector and an SPS stage. The switch is coupled to an AC source. The voltage detector detects a voltage of the AC source. The SPS stage is coupled to the switch and outputs a DC voltage. When the voltage of the AC source is larger than a predetermined voltage, the switch is turned off to isolate the AC source from the SPS stage. | 04-19-2012 |
20120106211 | POWER FACTOR AND LINE DISTORTION METHOD AND APPARATUS - Today, power distribution systems can be used to supply power to many loads, and since many loads, such as servers, are reactive (i.e., have capacitors and/or inductors), line distortion and power factor can be an issue. Conventional techniques to correct for line distortion and power factor use a specialized circuit that is generally in series with the load, but these specialized circuits can be prohibitively expensive when used in large numbers. Here, however, a corrective power supply has been provided, which can correct for other parallel power supplies that can reduce cost. | 05-03-2012 |
20120134185 | CIRCUIT FOR DISCHARGING AC POWER - There is provided a circuit for discharging AC power including: a first rectifier rectifying AC power inputted from an AC power line; an electro-magnetic interference (EMI) removing unit installed between the AC power line and the first rectifier to suppress EMI of the AC power; a discharging signal generator generating a discharging signal from the AC power; and a discharging unit including a discharging resistor for discharging a voltage charged in the EMI removing unit according to the discharging signal, whereby standby power consumption may be reduced when the AC power is inputted and the voltage charged in a capacitor for removing EMI may be discharged to meet a predetermined safety standard when the AC power is blocked. | 05-31-2012 |
20120195077 | NOVEL ARCHITECTURE OF A COMPENSATOR FOR POWER FACTORS AND HARMONICS FOR A POWER DISTRIBUTION SYSTEM - A rectifier system for a primary AC electrical power distribution system comprising a PFC circuit connected onto the primary distribution system which delivers a DC power supply and means for storing electrical energy connected to the outputs of the PFC via a switching circuit. This circuit is controlled in such a manner as to effect either the discharge of the electrical energy stored in the storage means onto the DC power supply line, or the charging of the storage means by the DC power supply line. A first control circuit determines the state of operation of the switching circuit by comparing the value of the voltage on the power supply line with a first reference voltage. A second control circuit regulates the power delivered by the PFC over the power supply line by comparing the voltage present at the output of the storage means with a second reference voltage. | 08-02-2012 |
20120230068 | CONVERTER WITH POWER FACTOR CORRECTION - A converter for converting an input-side alternating current into an output-side DC current, with a power factor correction being provided, wherein the converter comprises a transformer having at least two serially arranged primary windings, a first switch is used to switch a storage capacitor unit in series with a first primary winding to the alternating current in a clocked manner via rectification elements and a second primary winding is switchable to the storage capacitor unit in a clocked manner by a second switch. | 09-13-2012 |
20120236608 | Flux Converter with Power Factor Correction - A flux converter for converting an input-side alternating current into an output-side DC current, wherein a power factor correction is provided and the flux converter comprises a transformer having at least two serially arranged primary windings and a secondary winding wound in same direction. In addition, a first switch is used to switch a storage capacitor in series with a first primary winding to the alternating current in a clocked manner via rectification elements and a second primary winding can be switched to the storage capacitor in a clocked manner by a second switch. | 09-20-2012 |
20120262958 | POWER FACTOR CORRECTION CIRCUIT - A power factor correction circuit is provided which may include a first switched-mode converter circuit comprising a first inductor, at least one second switched-mode converter circuit having a second inductor, a control circuit coupled to the first and second switched-mode converter circuits, wherein the control circuit is configured to start a switching pulse for the second switched-mode converter circuit when the following conditions are fulfilled: the second inductor of the second switched-mode converter circuit has a predefined magnetization state and a predefined time period has elapsed since the start of a switching pulse for the first switched-mode converter circuit, wherein the predefined time period is a predefined fraction of the time period from the start of a previous switching pulse for the second switched-mode converter circuit to a time when the second inductor of the second switched-mode converter circuit has the predefined magnetization state. | 10-18-2012 |
20130003427 | POWER FACTOR CORRECTION CONVERTER AND POWER FACTOR CORRECTION CONVERSION DEVICE - A power factor correction converter and a power factor correction conversion device, includes two groups of bidirectional switches, an autotransformer, a boost inductor, a bus filter capacitor, two front bridge arms; and a rear bridge arm; the front end of each group of bidirectional switches are connected to a coil of the autotransformer in one-to-one correspondence, and a rear end of each group of bidirectional switches is connected to one end of an AC input power grid; a central tap of the autotransformer is connected to an output end of the boost inductor, and an input end of the boost inductor is connected to the other end of the AC input power grid; a front end of each group of bidirectional switches is connected to a front bridge arm, and a rear end is connected to the rear bridge arm. | 01-03-2013 |
20130016539 | POWER FACTOR CORRECTION CIRCUITAANM NISHIBORI; KoheiAACI Kitasaku-gunAACO JPAAGP NISHIBORI; Kohei Kitasaku-gun JPAANM CHALERMBOON; NadthawutAACI Kitasaku-gunAACO JPAAGP CHALERMBOON; Nadthawut Kitasaku-gun JP - A power factor correction circuit includes: the first series circuit consisting of the first rectifier element and the first switching element; the second series circuit consisting of the second rectifier element and the second switching element; the first/second reactors; and the first/second current detectors. The first/second current detectors have each the first/second transformers, both primary parts of which consist of the first/second reactors. The first and the second switching elements are controllable based on the first output signal according to the reactor current from the secondary side of the first transformer and the second output signal according to the reactor current from the secondary side of the second transformer so as to apply a desired DC voltage to the load circuit. | 01-17-2013 |
20130083571 | THREE-PHASE RECTIFICATION MODULE, THE SYSTEM THEREOF AND HARMONIC SUPPRESSION METHOD - A three-phase rectification module, the system thereof and harmonic suppression method are provided. The module includes a LCL filter unit, a three-phase uni-directional rectification unit coupled to the LCL filter unit, and a rectifier control unit for controlling power factor of three-phase AC power source and DC output voltage of the three-phase uni-directional rectification unit. A commutation diode is serially connected on the bridge-arm of each set of uni-directional rectification branch which is included in the three-phase uni-directional rectification unit, making it function as current uni-direction. Herein, the power factor of the three-phase AC power source is matched with the parameters of the LCL filter unit, such that the absolute value of the phase difference between AC input voltage and current of the three-phase uni-directional rectification unit is close or equal to a preset threshold. | 04-04-2013 |
20130094255 | POWER FACTOR CORRECTION CIRCUIT CAPABLE OF ESTIMATING INPUT CURRENT AND CONTROL METHOD FOR THE SAME - A power factor correction circuit and a control method thereof uses a power factor controller to generate a compensation current signal according to an input voltage of an AC-DC conversion circuit and a filter capacitor value. An estimation current signal is generated by summing up the compensation current signal and an inductor current signal of the AC-DC conversion circuit. And then, a pulse width modulation signal is outputted to the AC-DC conversion circuit according to the estimation current signal. The filter capacitor value is chosen from a capacitor value of a capacitor connected to the AC power source, an input capacitor value of the AC-DC conversion circuit, or sum of both the capacitor values. Therefore the estimation current signal approaches an input current signal of the power factor correction circuit to increase the power factor at the input terminals of the power factor correction circuit and decrease a harmonic distortion. | 04-18-2013 |
20130128634 | COMPOSITE AC TO DC CONVERTER WITH BOOSTING CAPABILITIES - A composite-like AC-to-DC converter has boosting capabilities. The term “composite AC-to-DC converter” has been coined to distinguish a converter using two or more conversion methods in parallel. All the autotransformer designs for the boost topology composite-like system begin with vector diagrams constructed using the tips of the line-to-line voltage vectors. A constructor arc is swung between these tips equal to the length of the line-to-line voltage vector span. The number of autotransformer three-phase outputs is then determined by the number of equally spaced rays drawn from the opposite vector tip to the arc. The intersection of points of these rays with the arc are used to design the composite-like autotransformer's winding's voltage ratios and interconnections. | 05-23-2013 |
20130163295 | POWER SUPPLY CONVERTER WITH A PRE-REGULATOR - A power supply converter with a pre-regulator is provided. In one embodiment, the power supply converter comprises a rectifier that receives an AC input voltage and provides a rectified AC input voltage, a filter that receives the rectified AC input voltage and provides a filtered DC input voltage and a pre-regulator that connects the rectified AC input voltage for allowing for providing current and voltage to the filter from the rectified AC input voltage upon a measurement that indicates that the AC input voltage or the rectified AC input voltage crosses a predetermined turn on threshold. | 06-27-2013 |
20130170257 | COMPOSITE AC-TO-DC POWER CONVERTER USING WYE ARCHITECTURE - A composite power conversion method using a WYE asymmetrical autotransformer that converts electrical power from AC to DC uses two or more conversion methods in parallel and provides a passive technique that “splits” the input 3-phase voltages into additional phases, so that the number of DC rectification pulses is increased to improve AC line current THD The WYE asymmetric autotransformer topology provides a potential improvement in size/weight and efficiency compared to former asymmetric autotransformers. | 07-04-2013 |
20130182469 | ELECTRO-MAGNETIC INTERFERENCE REDUCTION CIRCUIT FOR POWER CONVERTERS AND METHOD FOR THE SAME - The present invention provides a circuit of reducing electro-magnetic interference for a power converter. The circuit includes an oscillator, a current generation circuit, a feedback circuit and a ramping generator. The oscillator has a first terminal for receiving a first jittering current and a second terminal for feeding a second jittering current. The first jittering current and the second jittering current are correlated with a line signal obtained from an input of the power converter to vary a frequency of the oscillator. The first jittering current and the second jittering current are unequal. As the first jittering current is set greater than the second jittering current, the frequency of the switching signal increases whenever the line signal is increasing. As the first jittering current is set lower than the second jittering current, the frequency of the switching signal decreases whenever the line signal is increasing. | 07-18-2013 |
20130194839 | POWER SUPPLY DEVICE FOR A HOUSEHOLD APPLIANCE AND AN OPERATING METHOD THEREOF - A household appliance power supply device and method are disclosed. The power supply device comprises a switching converter having an input filtering stage; and a determining means configured to obtain estimation data indicative of the input current that is adsorbed from the a main power input, on the base of the rate of change of the bus voltage across said bus capacitor respectively, during a second switching period. The switching converter further comprises a bus capacitor, electrically connected with at least one output terminal of a rectifying stage, a resonant tank, electrically connected with said bus capacitor, and a switching device electrically connected with said resonant tank, said switching device being operated with a switching cycle having a first switching period, and a second switching period. | 08-01-2013 |
20130235627 | START-UP CIRCUIT TO DISCHARGE EMI FILTER FOR POWER SAVING OF POWER SUPPLIES - A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter. | 09-12-2013 |
20130250631 | POWER SUPPLY CIRCUIT WITH PFC FUNCTION, AND AUTOMATIC GAIN CONTROL CIRCUIT THEREFOR AND CONTROL METHOD THEREOF - The present invention discloses a power supply circuit with power factor correction (PFC) function, and an automatic gain control circuit therefor and a control method thereof. The power supply circuit includes the automatic gain control circuit and a load driver circuit. The automatic gain control circuit converts an input voltage to a regulation voltage, and the load driver circuit generates an output current according to the regulation voltage. The automatic gain control circuit automatically adjust the regulation voltage such that the regulation voltage has a substantially fixed amplitude or fixed average value under different input voltages of different specifications, and the output current provided by the load driver circuit varies in phase with the input voltage to provide a PFC function. | 09-26-2013 |
20130258727 | CONTROL CIRCUIT FOR DISCONTINUOUS CONDUCTION MODE POWER FACTOR CORRECTION CONVERTER USING HARMONIC MODULATION - A control circuit for a discontinuous conduction mode power factor correction converter using harmonic modulation includes: a first difference circuit configured to calculate and output a difference between an output voltage of a discontinuous conduction mode power factor correction converter and a reference voltage; a PI converter configured to perform a proportional integral control on an output signal of the first difference circuit, and output a signal having an arbitrary duty ratio; a second difference circuit configured to output a difference between a rectified input voltage, which is input to the discontinuous conduction mode power factor correction converter, and a harmonic modulation factor DC voltage; and a multiplication circuit configured to multiply an output of the PI controller and an output of the second difference circuit, and output a PFC control signal to a switch of the discontinuous conduction mode power factor correction converter. | 10-03-2013 |
20130279217 | ELECTRICAL SUPPLY APPARATUS - The present invention is directed to an electrical supply apparatus having an input for connecting the electrical supply apparatus to a mains supply which provides an alternating voltage as input voltage, having an output for connecting the electrical supply apparatus to a load, wherein the output provides a DC voltage as output voltage, having a rectifier which rectifies the input voltage to form a rectified input voltage, having a PFC module which comprises a smoothing device for smoothing the rectified input voltage and an active power factor correction device, wherein the power factor correction device is designed to form a time-dependent supply current for the smoothing device depending on a time-dependent current form signal in such a way that a time-dependent input current in the PFC module is matched to the current form signal, wherein the current form signal is produced by an analogue circuit. | 10-24-2013 |
20130301317 | SWITCHING POWER SUPPLY DEVICE - Provided is a switching power supply device capable of sufficiently removing ripple noise due to the switching frequency, the ripple noise being superimposed on an AC line, thereby stabilizing an output voltage. The switching power supply device includes: a switch including a first main terminal and a second main terminal, the first main terminal being connected to an inductor, the second main terminal being connected to a predetermined constant power supply unit, the switch being configured to connect or disconnect between the inductor and the constant power supply unit; and a control circuit configured to drive the switch at a predetermined switching frequency. The control circuit varies the switching frequency in accordance with a ratio of a connected time of the switch to a disconnected time of the switch. | 11-14-2013 |
20130314954 | POWER SUPPLY INPUT ROUTING - One embodiment of a power supply input routing apparatus can include a multilayer printed circuit board configured to accept only an alternating current (AC) line voltage, return and ground signals. The AC power jumper board can advantageously route AC power from one section of the power supply to another without burdening the power supply design with extra layer requirements or negatively increasing power supply area. Embodiments including an electronic device having a power supply as above are also disclosed. | 11-28-2013 |
20130336027 | POWER ADAPTOR - A power adaptor is provided. The power adaptor includes a connector, a rectifier, a filter, a regulator and a switching unit coupled between the rectifier and the filter. The connector receives an alternating current (AC) power. The rectifier provides a direct current (DC) power according to the AC power. The filter filters the DC power to generate a filtered signal. The regulator provides an output voltage according to the filtered signal. A switching state of the switching unit corresponds to the DC power. | 12-19-2013 |
20140022828 | SERIES SWITCH BRIDGELESS POWER SUPPLY - A series-switch bridgeless power supply provides common-mode EMI filtering. The power supply includes a center-tapped inductive device bifurcated into first and second windings. The AC input, provided at first and second input terminals, is applied to the center-tap of the inductive device. First and second switches are connected to distal ends of the first and second windings, respectively, and are connected in series with one another to form a circuit path from the first input terminal, through the inductive device and each of the series-connected switches, back through the inductive device and to the second input terminal. A controller turns the switches On and Off to modulate the current through the inductive device. Common-mode voltage generated by the modulation of the first and second switches is filtered by connection of each switch to a junction defined between a pair of capacitors connected in series between the first and second input terminal. The topology provides a first stage, two-pole filter for filtering common-mode voltages. | 01-23-2014 |
20140029317 | Non-Contact Transformer - A non-contact transformer assembly comprises an iron core having a pole with a length longer than the total height of the transmitting coil and the receiving coil to improve the induced voltage and magnetic field of the receiving coil and achieve the high effect of flux conversion. | 01-30-2014 |
20140029318 | PASSIVE POWER FACTOR CORRECTION CIRCUIT - The disclosure relates to a passive power factor correction circuit. The passive power factor correction circuit comprises: a filtering device being used for decreasing high order harmonic of an input current; a resonance device being coupled to the filtering device for controlling operation time of the input current; and a suppression device being coupled to the resonance device for suppressing ripple of the input current. | 01-30-2014 |
20140049992 | Switching Power Supply - A switching power supply is suitable for transforming AC input voltage to DC output voltage. The switching power supply includes a transformer, a power circuit, an output circuit, a switching element, a control element, a shielding element and a metal element. The power circuit is coupled to the primary side of the transformer to receive AC input voltage. The output circuit is coupled to the secondary side of the transformer to provide DC output voltage to the load. The switching element is coupled to the primary side of the transformer, and is coupled to the primary side ground. The control element is coupled to the switching element to control the switch of the switching element. The shielding element is surrounded onto the transformer, and is coupled to the primary side ground. The metal element is leaned against the switching element, and is coupled to the primary side ground. | 02-20-2014 |
20140049993 | POWER FACTOR CORRECTION - A power factor correction circuit includes an inductor L1, a diode D1, a switch Q3 and a controller | 02-20-2014 |
20140071719 | NOISE FILTERING - A noise filter circuit uses open loop signal processing to process the signal that causes the noise and generate a signal to be fed back into the system to cancel noise currents. | 03-13-2014 |
20140104900 | SYSTEM AND METHOD FOR CONNECTING THE MIDPOINT OF A DUAL-DC BUS TO GROUND - A system includes a power source that provides alternating current (AC) power and is connected to system ground; a dual-DC bus that provides direct current (DC) power to a load, and comprises a positive line, a negative line, and a midpoint line; an active rectifier that converts AC power from the power source to DC power for the dual-DC bus; and an impedance circuit connected between the midpoint of the dual-DC bus and the system ground that provides impedance for third harmonic common-mode current. | 04-17-2014 |
20140112033 | POWER SUPPLY APPARATUS - A power supply apparatus is provided, in which a control chip is used to detect an AC input power, so that it is unnecessary to additionally set an external independent detection circuit, by which not only a design cost is decreased, an extra standby loss is also avoided. Moreover, the method of using the control chip to execute detection of the AC input power can effectively decrease detection deviation, so as to notify the load system within an allowable (accurate) time (i.e. the predetermined time). Moreover, the control chip can determine and adjust the predetermined time within which the indication signal is generated to notify the load system according to an application requirement of the load system, so that the power supply apparatus can be generally applied in different types of the load systems having a timing control requirement. | 04-24-2014 |
20140126253 | POWER SUPPLY SYSTEM WITH DYNAMIC FILTERING - A power supply system ( | 05-08-2014 |
20140153299 | POWER FACTOR CORRECTION DEVICE - There is provided a power factor correction device including: a main switching unit including a first main switch and a second main switch performing a switching operation with predetermined phase differences; an auxiliary switching unit including a first auxiliary switch and a second auxiliary switch forming a transmission path for surplus power existing before the first main switch and the second main switch are turned on, respectively; an inductor unit positioned between a power input unit to which AC power is applied and the main switching unit and accumulating or discharging energy according to a switching operation of the main switching unit; and an auxiliary inductor unit regulating an amount of current flowing in the auxiliary switching unit in the event of a switching operation of the auxiliary switching unit. | 06-05-2014 |
20140153300 | POWER CONVERSION APPARATUS - Disclosed is a power conversion apparatus with further reduced inductance of conductors coupling condensers. The power conversion apparatus includes a smoothing circuit having first and second electrolytic condensers connected to each other in series and third and fourth electrolytic condensers connected to each other in series. The distance between a positive terminal of the first electrolytic condenser and a negative terminal of the third electrolytic condenser is shorter than the distance between the positive terminal of the first electrolytic condenser and a positive terminal of the fourth electrolytic condenser. The distance between the positive terminal of the fourth electrolytic condenser and a negative terminal of the second electrolytic condenser is shorter than the distance between the positive terminal of the fourth electrolytic condenser and the positive terminal of the first electrolytic condenser. | 06-05-2014 |
20140160812 | BIDIRECTIONAL UNISOLATED DC-DC CONVERTER BASED ON CASCADED CELLS - A DC-DC converter ( | 06-12-2014 |
20140169047 | ALTERNATING-CURRENT CONVERSION SYSTEM HAVING LOW POWER CONSUMPTION BLEEDER CIRCUIT - A low power consumption bleeder circuit is disclosed, and it is coupled to an alternating-current (AC) power source, an input filtering capacitor, and a rectifying filter. The low power consumption bleeder circuit includes a first switch component, a second switch component, and a controller. The first switch component is coupled to a first input terminal of the AC power source and a first connection terminal of the rectifying filter. The second switch component is coupled to a second input terminal of the AC power source and the first connection terminal of the rectifying filter. When the AC power source is detected to be removed, the controller controls at least one of the first switch component and the second switch component to be conductive. | 06-19-2014 |
20140177295 | PHASE SHIFT CIRCUIT AND POWER FACTOR CORRECTION CIRCUIT INCLUDING THE SAME - There are provided a phase shift circuit and a power factor correction circuit including the same. The phase shift circuit includes a switching circuit unit charging power in or discharging power from a capacitor through a plurality of switching devices and comparing a voltage of the capacitor with a predetermined reference voltage, and a clock generating unit generating a reference clock signal based on an output of the switching circuit unit, wherein the switching circuit unit turns the plurality of switching devices on or off, based on currents from inductors respectively included in a main circuit and a sub-circuit of a power factor correction circuit to determine a polarity of the voltage of the capacitor. | 06-26-2014 |
20140185338 | BALANCING POWER GRID PARAMETERS USING DISTRIBUTED ENERGY CONTROL - Described embodiments include a system and a method. A system includes an energy storage device configured to store and release energy. The system includes a waveform sensor configured to detect a second harmonic or higher frequency component deviation in a waveform of electric power supplied to the system by an electrical power grid. The system includes a bi-directional switched-mode converter coupled between the energy storage device and the electrical power grid. The switched-mode converter is configured to receive and convert electric power from the electrical power grid into energy stored in the energy storage device and to convert energy released from the energy storage device into electric power and discharge the converted electric power into the electrical power grid. The system includes a waveform correction manager configured to control the bi-directional switched-mode converter in a manner implementing a waveform deviation reduction strategy responsive to the detected deviation in the waveform. | 07-03-2014 |
20140185339 | POWER FACTOR CORRECTION CIRCUIT - There is provided a power factor correction circuit including: a power conversion circuit unit controlling an inductor current according to a switching signal applied to a main switch to convert an external input voltage into an output voltage having a predetermined range; an imbalance detection circuit outputting an imbalance state signal when the external input voltage is in an unbalanced state by using the inductor current; and a soft start circuit unit performing soft starting by adjusting the switching signal when the imbalance state signal is output by the imbalance detection circuit unit. | 07-03-2014 |
20140211523 | PEAK DETECTOR WITH IMPROVED FALSE PEAK REJECTION - A peak detector for synchronized switch harvesting on inductor converter includes a comparator and a filter for filtering an input signal to the peak detector and for providing a filtered signal to an input of the comparator. The filter has differentiating and integrating transfer characteristics for low and high frequency ranges, respectively, of the input signal so that peaks of the input signal to the peak detector which have primarily frequency components in the low range cause a relatively strong variation of the filtered signal and peaks of the input signal to the peak detector which have primarily frequency components in the high range are substantially integrated and cause a relatively weak variation of the filtered signal. The relatively strong variation of the filtered signal crosses a threshold of the comparator, which is configured to generate an output signal indicating a relation of the filtered signal regarding the comparator threshold. | 07-31-2014 |
20140247631 | FULLY-CONTROLLED BRIDGE RECTIFYING DEVICE WITH SURGE SUPPRESSION FUNCTION - The present invention is suitable for a power supply control field, and provides a fully-controlled bridge rectifying device with surge suppression function. In the embodiment of the present invention, the electric equipment uses a fully-controlled bridge rectifying device with surge suppression function comprising a driving module, a first controllable half-bridge module, an isolation driving module, a second controllable half-bridge module, a half-bridge module and a current limiting resistor. At the starting moment of the electric equipment, the first controllable half-bridge module cooperates the half-bridge module to carry out the bridge rectifier for the alternative current to charge the filter capacitor quickly, and the surge is suppressed by the current limiting resistor, when the electrical equipment work from starting state transits to a stable work state, the first controllable half-bridge module cooperates the second controllable half-bridge module to carry out the fully-controlled bridge rectification for the alternative current to provide direct current to the electric device, the whole fully-controlled bridge rectifying device has the advantages of simple structure, low cost and small volume, and also effectively reduces the power consumption of the equipment. | 09-04-2014 |
20140268933 | FILTER DEVICE, POWER CONVERTER AND COMMON MODE NOISE SUPPRESSION METHOD - A filter device comprises: a filter capacitor portion having one set of ends connected to the AC voltage unit, and the other set of ends connected to DC terminals of the semiconductor switching unit via a low impedance element, wherein both set of ends of the filter capacitor portion and the DC terminals of the semiconductor switching unit are static ground terminals of the power converter; a filter inductance portion a first set of connection terminals connected to the AC voltage unit, a second set of connection terminals connected to the AC terminals of the semiconductor switching unit, a third set of connection terminals connected to one of the static ground terminals of the power converter, and a fourth set of connection terminals; and a compensation portion having one end connected to the fourth set of connection terminals and the other end connected to the ground. | 09-18-2014 |
20140268934 | THREE-PHASE BUCK RECTIFIER FOR POWER SUPPLIES - A three-phase alternating current (AC) to direct current (DC) converter may include a three-phase AC filter receiving a three-phase AC power supply, a plurality of three-phase current source rectifiers (CSR) connected in parallel with each other and connected to a three-phase AC filter, and an output filter connected to the CSR's to generate a DC output. Each of the CSRs may include six switches and a free-wheeling diode. Each of the three filtered AC inputs from the three-phase AC filter may be connected via a switch of the six switches to selectably send current into a positive line, and each of three filtered AC inputs from the three-phase AC filter may be connected via another switch of the six switches to selectably receive current from a negative line. The free-wheeling diode may have a cathode connected to the positive line and an anode connected to the negative line. | 09-18-2014 |
20140293664 | HIGH-VOLTAGE HEAVY-CURRENT DRIVE CIRCUIT APPLIED IN POWER FACTOR CORRECTOR - A high-voltage heavy-current drive circuit applied in a power factor corrector, comprising a current mirroring circuit ( | 10-02-2014 |
20140301119 | Multilevel AC/DC Power Converting Method and Converter Device Thereof - A multilevel AC/DC power converter device includes a high-frequency power converter including a first AC port and a low-frequency power converter including a second AC port and a DC port. A power converting method includes: serially connecting the first AC port of the high-frequency power converter and the second AC port of the low-frequency power converter; operating frequency of the low-frequency power converter synchronized with frequency of an AC power source and operating the high-frequency power converter with high-frequency PWM to generate a multilevel AC voltage; controlling the multilevel AC voltage to obtain a current of an input AC port being sinusoidal and in same phase with a voltage of the AC power source. Accordingly, the input power factor approaches unity and the low-frequency power converter supplies a DC voltage to a load via a DC output port. | 10-09-2014 |
20140307490 | OVERVOLTAGE PROTECTION UNIT WITH AC INPUT CURRENT SENSORS - An overvoltage protection unit includes a power circuit module and a controller module. The power circuit module receives power from a power source on an AC input and includes a rectifier that converts voltage on the AC input into a DC Link output voltage, and an AC input current sensor that senses a current on the AC input. The controller module provides an output to terminate power from the power source based upon the DC Link output voltage and a sensed current from the AC input current sensor. | 10-16-2014 |
20140313795 | SINGLE PHASE BI-DIRECTIONAL AC-DC CONVERTER WITH REDUCED PASSIVE COMPONENTS SIZE AND COMMON MODE ELECTRO-MAGNETIC INTERFERENCE - A bidirectional AC-DC converter is presented with reduced passive component size and common mode electro-magnetic interference. The converter includes an improved input stage formed by two coupled differential inductors, two coupled common and differential inductors, one differential capacitor and two common mode capacitors. With this input structure, the volume, weight and cost of the input stage can be reduced greatly. Additionally, the input current ripple and common mode electro-magnetic interference can be greatly attenuated, so lower switching frequency can be adopted to achieve higher efficiency. | 10-23-2014 |
20140321174 | POWER SUPPLY DEVICE AND SEMICONDUCTOR DEVICE - Switching loss is reduced by decreasing the switching frequency of a PFC power supply in light load condition, whereas the switching frequency is maintained high in heavy load operation. Efficiency in light load operation is thus improved without enlarging a boosting inductor and an output smoothing capacitor. A capacitor is provided in a triangular wave generating circuit and the triangular wave generating circuit outputs a triangular wave by charging and discharging this capacitor. Charging and discharging of the capacitor are controlled by an oscillation frequency control circuit output current which is input to a comparator. | 10-30-2014 |
20140340949 | POWER CONVERTER AND POWER FACTOR CORRECTOR THEREOF - A power converter includes a rectifier and a power factor corrector. The rectifier is to be coupled to an alternating current power source and is configured to output a rectified signal. The power factor corrector includes a correcting circuit and a control circuit. The correcting circuit receives the rectified signal and is configured to generate an output voltage based on the rectified signal and a driving signal. The control circuit is configured to generate a first to-be-compared signal based on the rectified signal, to generate a second to-be-compared signal based on the output voltage, to compare the first and second to-be-compared signals, and to generate the driving signal based on a result of comparison performed thereby. | 11-20-2014 |
20140369091 | METHOD FOR OPERATING A DRIVE CONTROL DEVICE, FACILITY WITH MEANS FOR EXECUTING THE METHOD AND DRIVE CONTROL DEVICE WITH SUCH A FACILITY - A drive controller and a method for operating a drive controller having a converter with a DC link circuit, includes measuring during operation phase currents generated by the converter; forming from the measured phase currents a current vector in a first coordinate system; rotating, with a first transformation angle and with a first rate of change, the current vector into a second coordinate system to generate a resulting current vector; supplying the resulting current vector to a regulator to generate a resulting voltage vector at an output of the regulator; rotating, with the first transformation angle or with a second transformation angle rotating at the first rate of change, the resulting voltage vector back into the first coordinate system to generate a resulting back-transformed voltage vector; and using the resulting back-transformed voltage vector as an influencing variable in addition to U/f control or vector regulation for controlling the converter. | 12-18-2014 |
20150016155 | POWER SUPPLY APPARATUS - A power conversion circuit connected to a three phase alternating current line is controlled in a PWM system. To control an arm corresponding to each phase, first to third carrier wave signals are generated. The first to third carrier wave signals include two signals having phases, respectively, offset by 180 degrees from each other. This allows a zero phase component to less frequently reach a peak value and be accordingly reduced as time averaged. This can reduce a zero phase harmonic component generated from a power supply apparatus. | 01-15-2015 |
20150062983 | CHOKE COIL AND POWER SUPPLY DEVICE INCLUDING THE SAME - There is provided a choke coil, including: a core part having first and second legs; a winding part having a first coil wound around the first leg and a second coil wound around the second leg; and a sectioning wall partitioning the winding part into several winding regions. | 03-05-2015 |
20150092460 | METHOD AND APPARATUS FOR DETECTING AFE FILTER CAPACITOR DEGRADATION - Methods and systems are disclosed for detecting capacitor degradation in an input filter of an active front end power conversion system in which voltage and current sensing is performed to determine sequence component impedance asymmetry to detect filter capacitor degradation according to the value of an off-axis admittance matrix component for Delta or Y-connected filter capacitor banks without sensitivity to voltage unbalance, and with the capability to identify particular degraded capacitor locations based on individual impedance values. | 04-02-2015 |
20150103570 | Circuit Configuration and System of Capacitors - A circuit configuration and system of capacitors for a converter having a filter system, the circuit configuration including a converter, which has an alternating voltage connection, especially for a multiphase input- or output-side alternating voltage source, and a unipolar connection on the input or output side, especially a direct voltage connection, especially for a voltage intermediate circuit, the alternating voltage connection being connected to phase lines, especially to three phase lines, the phase lines having inductances, in particular, characterized in that first capacitances are situated between a phase line and a common star point in each case, it being the case, in particular, that one of the first capacitances is situated between a particular phase line, especially each phase line, and the common star point, it being the case, in particular, that each of the first capacitances is of equal size. | 04-16-2015 |
20150103571 | VOLTAGE CONVERSION DEVICE AND METHOD FOR ADJUSTING COMMON MODE NOISE IMPEDANCE - The present invention provides a voltage conversion device and a method for adjusting common mode noise impedance, which relates to the circuit field, and enables a common mode impedance value of a noise source and an impedance value of an EMI filter to enter a mismatch state, so as to reduce a restriction on design of the EMI filter, so that a size of the EMI filter is smaller and utilization efficiency of the EMI filter is higher. The method is: adjusting a common mode impedance value of a noise source by adjusting a balanced impedance value in a balanced winding on a voltage conversion device, so as to enable the common mode impedance value of the noise source and an impedance value of an EMI filter to enter a mismatch state. | 04-16-2015 |
20150109834 | ALTERNATING-CURRENT CONVERSION SYSTEM HAVING LOW POWER CONSUMPTION BLEEDER CIRCUIT - A low power consumption bleeder circuit is disclosed, and it is coupled to an alternating-current (AC) power source, an input filtering capacitor, and a rectifying filter. The low power consumption bleeder circuit includes a first switch component, a second switch component, and a controller. The first switch component is coupled to a first input terminal of the AC power source and a first connection terminal of the rectifying filter. The second switch component is coupled to a second input terminal of the AC power source and the first connection terminal of the rectifying filter. When the AC power source is detected to be removed, the controller controls at least one of the first switch component and the second switch component to be conductive. | 04-23-2015 |
20150117074 | AUTO-TUNING CURRENT LOOP COMPENSATION FOR POWER FACTOR CORRECTION CONTROLLER - An apparatus comprises a power converter circuit and a controller. The power converter circuit includes an inductor, a switching circuit, and a digital control loop circuit having an adjustable transfer function, wherein the transfer function includes a zero variable and a signal gain variable. The controller includes a tuning module configured to set a value for the zero variable, set the signal gain variable to a first gain value, determine a control error for the first gain value setting, wherein the control error is a difference between a reference current and a load current at a circuit load, iteratively update the gain value of the signal gain variable and determine the control error for the updated gain value, and set an operating gain value of the signal gain variable to the gain value corresponding to a minimum control error. | 04-30-2015 |
20150138851 | POWER SUPPLY APPARATUS - A PFC circuit generates substantially sinusoidal current that is in-phase with AC input voltage to compensate for a power factor. A DC-DC converter converts the voltage of a signal outputted from the PFC circuit to determined voltage. A current change detection section detects an amount of change in current outputted from the DC-DC converter, compares the detected amount of change in current with a threshold set in advance, and if the detected amount of change in current is larger than the threshold, outputs a gain switching signal for raising the gain of voltage outputted from the PFC circuit. The current change detection section outputs a voltage control signal for raising the voltage outputted from the PFC circuit to a determined value. A voltage setting section sets the voltage outputted from the PFC circuit to the determined value on the basis of the voltage control signal. | 05-21-2015 |
20150146458 | System and Method for Switched Mode Power Supply - In accordance with an embodiment, a power supply controller includes a current controller configured to control an input current of a power supply. The current controller includes a first feed forward controller having an input configured to be coupled to a first power supply signal, and an output coupled to an output of the current controller. A gain of the first feed forward controller is proportional to a compensation factor when the power supply operates in a discontinuous conduction mode (DCM) and is substantially zero when the power supply operates in a continuous conduction mode (CCM). | 05-28-2015 |
20150318103 | HYBRID PLANAR COMMON-MODE CHOKE - A common-mode choke includes a plurality of hybrid core inductors and a printed circuit board. Each of the plurality of hybrid core inductors includes a first core made of a first material, a second core made of a second material, and at least one common coil configured to generate a magnetic field in both the first and second cores. The printed circuit board is configured to connect the plurality of hybrid core inductors in series. | 11-05-2015 |
20150318781 | CONVERTER CIRCUIT WITH POWER FACTOR CORRECTION - A converter circuit with power factor correction comprises an alternative current (AC) voltage source, a bidirectional AC switch circuit, a first un-bidirectional channel circuit, a second un-bidirectional channel circuit, a first energy storing circuit, a second energy storing circuit and an output circuit. When the bidirectional AC switch circuit is on-state, at least one of the first energy storing circuit and the second energy storing circuit is charged by an AC input current and then energy is stored with magnetic flux form. When the bidirectional AC switch circuit is off-state, at least one of the first energy storing circuit and the second energy storing circuit releases the energy to the output circuit. | 11-05-2015 |
20150357901 | VOLTAGE SOURCE CONVERTER - A voltage source converter includes a converter limb extending between DC terminals and having limb portions separated by an AC terminal, the DC terminals being connectable to a DC electrical network and the AC terminal being connectable to an AC electrical network. Each limb portion includes at least one switching element and a chain-link converter including a series-connected modules, each module including at least one switching element and at least one energy storage device combining to selectively provide a voltage source. The chain-link converter is connected to the AC terminal, and the switching element(s) of each limb portion is switchable to switch the chain-link converter into and out of circuit with the corresponding DC terminal. The voltage source includes a control unit which coordinates the switching of the switching elements of the limb portions and the switching element(s) in each module of the chain-link converter. | 12-10-2015 |
20150364989 | POWER FACTOR CORRECTION CIRCUIT FOR A POWER ELECTRONIC SYSTEM - A power factor correction circuit for a power electronic system comprising a series-pass device arranged to control an input characteristic of a power converter, and a control mechanism arranged to control an operation of the series-pass device during a power conversion process, so as to increase a power factor of the power electronic system and/or to reduce a harmonic distortion generated by the power converter to an electrical current supplied by a power source in the power electronic system. | 12-17-2015 |
20160013715 | LCL FILTER RESONANCE MITIGATION TECHNIQUE FOR VOLTAGE SOURCE CONVERTERS | 01-14-2016 |
20160036344 | THREE-PHASE BUCK RECTIFIER FOR POWER SUPPLIES - A three-phase alternating current (AC) to direct current (DC) converter may include a three-phase AC filter receiving a three-phase AC power supply, a plurality of three-phase current source rectifiers (CSR) connected in parallel with each other and connected to a three-phase AC filter, and an output filter connected to the CSR's to generate a DC output. Each of the CSRs may include six switches and a free-wheeling diode. Each of the three filtered AC inputs from the three-phase AC filter may be connected via a switch of the six switches to selectably send current into a positive line, and each of three filtered AC inputs from the three-phase AC filter may be connected via another switch of the six switches to selectably receive current from a negative line. The free-wheeling diode may have a cathode connected to the positive line and an anode connected to the negative line. | 02-04-2016 |
20160043298 | FREQUENCY TRACKING PIEZOELECTRIC TRANSFORMER POWER CONVERTER WITH SIMULTANEOUS TWO-PARAMETER CONTROL - The present invention is directed to a piezoelectric transformer based power converter that exhibits efficient operating point tracking ability while providing output regulation by means of simultaneous two-parameter control of the converter power stage. A regulation control stage provides the power stage a regulation control signal indicative of the difference between the measured output parameter and a set-point reference, therefore continuously controlling the gain of the converter to result in a stabilized, regulated output. Additionally, a frequency control stage simultaneously provides the power stage with a frequency control signal correlative to the difference between the current and desired operating points of the piezoelectric transformer. The power stage then translates the frequency control signal into an adjustment to the operational frequency of the input signal to the piezoelectric transformer, as to continuously drive the operating point to the desired position. | 02-11-2016 |
20160080036 | POWER LINE COMMUNICATION AC/DC ADAPTOR - A power line communication (PLC) AC/DC adaptor includes a filter, a rectifier, a power factor correction circuitry, and a PLC module. The filter includes a differential mode choke and a common mode choke. The differential mode choke is coupled to AC. The common mode choke is coupled to the differential mode choke. The rectifier is coupled to the common mode choke. The power factor correction circuitry is coupled to the rectifier. The PLC module is coupled to AC to process a PLC signal from AC and output a control signal. | 03-17-2016 |
20160094142 | SYSTEM AND METHOD FOR REGULATION OF MULTI-LEVEL BOOST BASED RECTIFIERS WITH POWER FACTOR CORRECTION - A control method and system are provided for regulating operation of power factor correction rectifiers based on the non-symmetric boost converter topology. Control of both the front-end stage is enabled taking sinusoidal current from the utility network and a downstream converter providing isolated DC output voltage. Also provided are a method and system for reducing volume of reactive components in boost-based rectifiers with power factor correction. Flux density through the inductor is reduced with a biasing inductor current having a much lower frequency than the switching frequency of the converter. | 03-31-2016 |
20160099637 | POWER SYSTEM - A power system is disclosure. The power system includes a processor, a power supply device, and a power-managing module. The power supply device includes a converter and a controller, the converter has a main power output for outputting a main voltage and a standby power output for outputting a standby voltage, and the controller is electrically connected to the converter. The power-managing module is communicating with the electronic device and the power supply device and includes a switch and a power manager, the switch is electrically connected to the main power output and the electronic device, and the power manager is electrically connected to the electronic device, the switch, and the controller. When the electronic device is in a standby operation mode, the power manager makes the switch turn off to prevent to main voltage from conducting to the electronic device. | 04-07-2016 |
20160126823 | MULTIPLE-TUNED FILTER DESIGN METHOD FOR HVDC SYSTEM - A method of designing a multiple-tuned filter (MTF) of a high voltage direct current (HVDC) system is provided. The method includes selecting an input parameter for the MTF, setting a resonance frequency of the MTF, calculating values of inductance (L) and capacitance (C) which are filter parameters of the MTF on the basis of the input parameter and the resonance frequency, combining a value of resistance (R) with the filter parameters and calculating a price according to the combination, and storing the combined values of R, L, and C when the calculated price falls within a predetermined price range. | 05-05-2016 |
20160126829 | INDUCTOR AND POWER FACTOR CORRECTOR USING THE SAME - The present invention is related to an inductor, which includes winding set, a magnetic core, and an auxiliary magnetic core. The magnetic core includes a winding part and two opposite end-surfaces. The auxiliary magnetic core including a top surface is attached on one of the end surface and faces the other end surface so as to form an air gap therebetween. The permeability of the auxiliary magnetic core is smaller than that of the magnetic core. The winding is wound around the winding part, the air gap, and the auxiliary magnetic core. The auxiliary magnetic core achieves magnetic saturation before that of the magnetic core when current flowing through the winding set is increased, which reduces current variation per unit time of the inductor. | 05-05-2016 |
20170237333 | CIRCUIT ARRANGEMENT FOR FILTERING AN ELECTRIC CURRENT | 08-17-2017 |
20170237334 | ACTIVE FILTER AND AC-DC CONVERSION DEVICE | 08-17-2017 |
20170237338 | ELECTRONIC CIRCUIT AND METHOD FOR CONTROLLING THE SAME | 08-17-2017 |