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51results about How to "Corrected power factor" patented technology
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Power factor correction boost converter with continuous, discontinuous, or critical mode selection
ActiveUS7733678B1Small sizeReduce Harmonic DistortionAc-dc conversion without reversalEfficient power electronics conversionConstant powerAverage current
In a method and apparatus for controlling power factor correction in mixed operation modes, a frequency of the input voltage is obtained by detecting the zero crossing points of the input voltage. A peak of the input voltage is obtained by detecting input voltage with 90 degree phase. Thus, the present invention predicts the input voltage by its frequency and peak and the characteristic of the sine wave. A digital signal processor computes the duty and frequency of a boost switch, switching the operation mode of the boost converter among continuous mode, critical mode and discontinuous mode according to input voltage or the load. According to another aspect, the operation is switched to critical mode from the average current mode when a zero current is detected before the charging and recharging cycle of the boost switch is finished. Overcurrent protection may be achieved by controlling current in response to detected voltage to provide a substantially constant power level. The overcurrent protection may be adaptive in nature.
Owner:MARVELL ASIA PTE LTD
Power supply apparatus and methods with power-factor correcting bypass mode
InactiveUS6906933B2Corrected power factorLimited bandwidthEfficient power electronics conversionConversion with intermediate conversion to dcPower factor correctorAC power
A power supply apparatus, such as an uninterruptible power supply, includes an AC input configured to be coupled to an AC power source and an AC output. The apparatus also includes an AC / DC converter circuit, e.g., a boost rectifier circuit, with an input coupled to the AC input. The apparatus further includes a DC / AC converter circuit, e.g., an inverter circuit, configured to be coupled between an output of the AC / DC converter circuit and the AC output. A bypass circuit is operative to establish a coupling between the AC input to the AC output in a first (e.g., bypassed) state and to interrupt the coupling in a second (e.g., “on line”) state. The AC / DC converter circuit is operative to control current at the AC input when the bypass circuit is in the first state. For example, the AC / DC converter circuit may be operative to control current at the AC input to correct a power factor at the AC input port when bypassed, such that the AC / DC converter circuit may act as a line conditioner in the bypassed state.
Owner:EATON INTELLIGENT POWER LIMITED
Method and system for power factor correction using constant pulse proportional current
InactiveUS7391630B2High performanceReduce problemAc-dc conversion without reversalEfficient power electronics conversionPower factor correctorPwm controller
A Power Factor Correction (PFC) system providing near unity power factor for an AC power source (VAC) connected to a complex load. The system includes a bridge rectifier, boost or buck-boost converter, complex load, and pulse width modulation (PWM) controller to provide pulses with variable duty cycle to a power switch. The invention is a constant pulse proportional current (CPPC) PWM controller that generates trains of pulses constant in frequency and duty cycle for one semi-cycle of the VAC. The duty cycle of the driving signal is modified by applying open-loop correction signals to summing nodes of PWM circuits. Since the PWM provides a constant train of driving pulses with constant duty cycle for one semi-cycle of the VAC, the current absorbed by the converter is contingent and linearly proportional to the voltage. Thus, the output current follows the voltage resulting in a power factor of near unity.
Owner:PF1
Partial regeneration in a multi-level power inverter
ActiveUS20100142234A1Corrected power factorDc source parallel operationAc-ac conversionPower inverterTransformer
In one embodiment, the present invention includes a medium voltage drive system having multiple power cells each to couple between a transformer and a load. A first subset of the power cells are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform partial regeneration. A controller may be included in the system to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system.
Owner:TECO WESTINGHOUSE MOTOR
Partial regeneration in a multi-level power inverter
ActiveUS7940537B2Corrected power factorDc source parallel operationAc-ac conversionPower inverterPower factor
In one embodiment, the present invention includes a medium voltage drive system having multiple power cells each to couple between a transformer and a load. A first subset of the power cells are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform partial regeneration. A controller may be included in the system to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system.
Owner:TECO WESTINGHOUSE MOTOR
Flyback converter utilizing boost inductor between ac source and bridge rectifier
InactiveUS20110149613A1Low resistance pathCorrected power factorEfficient power electronics conversionDc-dc conversionMagnetic coreAC power
A flyback converter utilizes a boost inductor coupled between a source of AC power and a bridge rectifier to provide power factor correction. A primary winding of the flyback transformer is coupled in series with a storage capacitor across the output of the bridge rectifier. A circuit, which includes a switching transistor, is also coupled across the output of the bridge rectifier to provide a low resistance path when the switch is closed. The cores of the boost inductor and the transformer are loaded with energy when the switch is closed. When the switch opens, the energy stored in the magnetic cores is transferred to the output via the transformer secondary winding and rectification circuitry.
Owner:COMARCO WIRELESS SYST LLC
Merged ramp/oscillator for precise ramp control in one cycle pfc converter
ActiveUS20090273330A1Accurate power factor correctionWithout costAc-dc conversion without reversalEfficient power electronics conversionEngineeringVoltage reference
A one cycle power factor correction converter circuit comprising a switch for controlling a DC output voltage of the converter circuit, the switch being switched by a drive signal having a frequency determined by a clock signal; the converter circuit being provided with a DC input voltage and producing the DC output voltage, the DC input voltage being rectified from an AC input; a controller circuit for controlling an on-time or off-time of the switch to set the output voltage and to achieve power factor correction at the AC input; the controller circuit comprising an error amplifier receiving a feedback voltage from the output of the converter circuit and a reference voltage and producing an error signal; a ramp generator receiving the error signal and generating a first ramp signal by integrating a signal related to the error signal; a pulse width modulation circuit receiving the first ramp signal and a signal related to the error signal and producing a pulse width modulated signal by comparing the first ramp signal and the signal related to the error signal; the pulse width modulated signal determining the on-time or off-time of the switch to control the output voltage with power factor correction; further comprising a circuit for terminating the first ramp signal when a predetermined inequality exists between the first ramp signal and a reference signal and for developing the clock signal from the first ramp signal.
Owner:INFINEON TECH AMERICAS CORP
Phase-control dimming electronic ballast system and control method thereof
InactiveUS20090261744A1Expand dimming rangeImprove of non-zero power switchingElectrical apparatusElectric light circuit arrangementPower inverterTransverter
A phase-control dimming electronic ballast system and the control method thereof, wherein the system includes a phase controller, a converter, an inverter and a system controller. Moreover, the system controller senses a firing angle from the phase controller, and adjusts the output voltage of the converter and the switching frequency of the inverter to achieve the operation of dimming fluorescent lamp.
Owner:FEGO PRECISION INDAL
Power factor impoving circuit
InactiveUS20050226015A1Improve efficiencyReduce noiseAc-dc conversion without reversalEfficient power electronics conversionFull waveAlternating current
A power factor correction circuit includes; a series circuit connected to a positive-electrode output terminal P1 and negative-electrode output terminal P2 of a full-wave rectifying circuit B1, which rectifies an having current power-supply voltage of an alternating current power-supply Vac1, and including a booster winding 5a and a wind-up winding 5b wound on a booster reactor L1, a diode D1 and a smoothing capacitor C1; a series circuit, connected between the positive-electrode output terminal P1 and the negative-electrode output terminal P2 and having the booster winding 5a, a ZCS reactor L2 and a switch Q1; a diode D2 connected between a junction, between the switch Q1 and the ZCS reactor L2, and the smoothing capacitor C1; and a control circuit 10 that controllably turns the switch Q1 on and off for controlling an output voltage of the smoothing capacitor C1 to a given voltage.
Owner:SANKEN ELECTRIC CO LTD
Soft-switching three-phase power factor correction converter
InactiveUS20050024023A1Reduce Harmonic DistortionSmall sizeAc-dc conversion without reversalEfficient power electronics conversionSoft switchingControl manner
The proposed converter includes: three boost inductors, three filter capacitors, six main switch modules each having a switch element, a diode and a resonant capacitor, two auxiliary switches, two main diodes, a resonant inductor, and two output capacitors. A control circuit is employed for generating driving signals from six SPWM signals to drive the six main switches and the two auxiliary switches of the converter. A six-step control method is employed to adjust the SPWM signals and a soft-switching method is employed to generate the driving signals to turn on / off the six main switch modules and the two auxiliary switches when the voltage on the second terminal of each main switch module / auxiliary switch is zero and the current flows into each auxiliary switch is zero to correct the power factor.
Owner:DELTA ELECTRONICS INC
Single stage PFC and power converter unit
ActiveUS6934168B2Lower requirementReduce switching lossesEfficient power electronics conversionDc-dc conversionSupply energyEngineering
A power converter provides constant load power while achieving a high power factor in a single stage configuration with reduced component count and ratings. The power converter takes a rectified line input to a switching half-bridge that supplies current to a load. A series combination of shunt switch and capacitor is connected across the load to store energy from the input and supply energy to the load. The switches are operated with conduction angles that achieve constant power supplied to the load while drawing a sinusoidal current in phase with the input voltage to achieve high power factor. The circuit provides a simplified configuration over prior power converters that may be used with a resonant load as part of an electronic ballast or an AC-to-DC converter. The power converter configuration and operation also achieves a low total harmonic distortion on the input line power.
Owner:INFINEON TECH AMERICAS
Switch power converter control with spread spectrum based electromagnetic interference reduction
ActiveUS8723438B2Reduce electromagnetic interferenceCorrected power factorEfficient power electronics conversionElectric light circuit arrangementFrequency spectrumControl signal
Owner:CIRRUS LOGIC INC
Power factor correction circuit
InactiveUS7375995B1Easy to operateCorrected power factorEfficient power electronics conversionConversion with intermediate conversion to dcTransformerDc current
A power factor correction circuit used for regulating the phase of a DC current outputted from a rectifier unit in a power supply includes an energy inductor, an output diode, a switch unit, a pulse width modulation unit, a sensing resistor, and a converter transformer. The converter transformer utilizes the DC current outputted from the rectifier unit to generate an induced current, which will pass through the two ends of the sensing resistor to produce a reference voltage, thereby the pulse width modulation unit can produce the duty cycle for the switch unit according to the reference voltage, so that the switch unit can regulate the phase of the DC current through controlling the flowing direction of the DC current.
Owner:SPI ELECTRONICS
Parallel-connected power conversion system of multi-phase generator and method of operating the same
InactiveUS20150194877A1Corrected power factorAc-dc conversion without reversalEfficient power electronics conversionControl signalEngineering
A parallel-connected power conversion system of a multi-phase generator configured to provide a power factor correction for a multi-phase generator. The parallel-connected power conversion system includes a parallel-connected power conversion apparatus and a control unit. The parallel-connected power conversion apparatus has a plurality of power conversion units connected in parallel to each other. The parallel-connected power conversion apparatus receives a plurality of generator currents and a plurality of generator voltages generated from the multi-phase generator, and outputs a DC voltage. The control unit generates a plurality of control signals to correspondingly control the power conversion units so that the generator currents linearly follow the generator voltages, therefore the power factor correction of the multi-phase generator is achieved.
Owner:DELTA ELECTRONICS INC
LED circuit
ActiveCN101600277ACorrected power factorImprove work efficiencyEfficient power electronics conversionElectric circuit arrangementsFlicker-freePhase difference
The invention relates to an LED circuit, which comprises a power factor control and voltage boosting unit, an LED lamp, and a voltage reduction unit which are connected in turn, a control unit which is connected with the power factor control and voltage boosting unit, the LED lamp, and the voltage reduction unit, and a detection unit, wherein the power factor control and voltage boosting unit and the voltage reduction unit independently work. On the basis of constant current output, the LED circuit can also adjust the phase difference between input voltage and loop current so as to greatly correct power factors and obtain high work efficiency; and compared with the prior art, the LED circuit has flicker-free adjust luminance, good stability and high reliability.
Owner:刘振韬 +1
LED (light-emitting diode) wall wash lamp and assembling method thereof
ActiveCN103017035AEffective coolingNot easy to crushFlexible AC transmissionMechanical apparatusNeck partsEngineering
The invention relates to an LED (light-emitting diode) wall wash lamp, which comprises a lamp body, a light-transmitting plate and two hinge pressing bars, wherein the light-transmitting plate is arranged on a light-emitting opening at the top of the lamp body; the two hinge pressing bars are symmetrically arranged at the two sides of the lamp body, and are distributed along the length direction of the lamp body; circular grooves are arranged near outside of the top of the lamp body; the circular grooves are distributed along the length direction of the lamp body; ribs which are distributed along the length direction are arranged near the inner side surface of a neck part of the hinge pressing bar; the ribs are in a cylindrical shape, and are in running fit with the circular grooves; the tail end extending inwards at the top of each hinge pressing bar is suitable for compressing the edge of the light-transmitting plate; the lower end part of each hinge pressing bar is provided with a bolt used for controlling the tail end to compress the light-transmitting plate; under the action of the bolt, the lower end part of each hinge pressing bar is suitable for the side away from the lamp body; and the ribs rotate in the circular grooves, so that the light-transmitting plate is compressed by the tail end.
Owner:CHANGZHOU INST OF LIGHT IND TECH +1
Merged ramp/oscillator for precise ramp control in one cycle PFC converter
ActiveUS8085562B2Corrected power factorWithout costAc-dc conversion without reversalEfficient power electronics conversionVoltage referenceVIT signals
Owner:INFINEON TECH AMERICAS CORP
Converter circuit with power factor correction
ActiveUS20150318781A1Avoid breakingEnlarge regionAc-dc conversion without reversalEfficient power electronics conversionVoltage sourceAlternating current
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.
Owner:LITE ON ELECTRONICS (GUANGZHOU) LTD +1
Charger for electric vehicle
InactiveUS20120229088A1Reduce switching lossesIncrease the output voltageBatteries circuit arrangementsCharging stationsSoft switchingPower factor
Disclosed herein is a charger for electric vehicles, which has a wide output voltage range. The charger is a slow charger having an improved configuration to respond to a wide output voltage range as well as output change. The charger may achieve limited switching loss and reduced noise via soft-switching operation, thereby enabling high-efficiency large-power Power Factor Correction (PFC) and increasing conversion efficiency of a DC / DC converter.
Owner:HL MANDO CORP
Power supply topologies for liquid crystal display screen
InactiveCN1924648ACorrected power factorEfficient power electronics conversionStatic indicating devicesPower topologyLiquid-crystal display
A method according to one embodiment may include generating, by a controller, a plurality of control signals to control operations of inverter circuitry to generate an AC signal from a DC signal. The method of this embodiment may also include using the control signals generated by the controller to also control operations of power factor correction (PFC) circuitry, via the inverter circuitry, to enable the PFC circuitry to generate power factor correction of an input source coupled to the PFC circuitry and the inverter circuitry. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.
Owner:O2 MICRO INT LTD
Switching-mode power supply circuit
ActiveUS20200328671A1Good performanceReduce cost and volumeEfficient power electronics conversionDc-dc conversionCapacitancePower circuits
A switching-mode power supply circuit includes a boost inductor, a boost capacitor, a storage capacitor, a transformer or DC-DC inductor, a first switching component, an output rectification component, a filter capacitor, a feedback and control circuit, first and second rectification circuits. When first switching component conducts, the boost inductor, boost capacitor and first switching component form a first boost loop, the boost inductor stores energy, and the storage capacitor, first switching component and transformer or DC-DC inductor form a first DC-DC loop. When first switching component cuts off, the boost inductor, boost capacitor, storage capacitor and transformer or DC-DC inductor form a second boost loop, and the transformer or DC-DC inductor, output rectification component and filter capacitor form a second DC-DC loop. The filter capacitor supplies energy to a load. The feedback and control circuit drives the first switching component to turn on / off according to a chopping wave having specific frequency and duty to control a voltage, current or power output to the load.
Owner:SHANGHAI TUITUO TECH CO LTD
Parallel-connected power conversion system of multi-phase generator and method of operating the same
InactiveUS9473021B2Corrected power factorAc-dc conversion without reversalEfficient power electronics conversionPower flowControl signal
Owner:DELTA ELECTRONICS INC
Driving circuit and method for providing power to led light source, and power converter
InactiveCN103517506AReduce line frequency interferenceCorrected power factorElectrical apparatusElectroluminescent light sourcesDriver circuitTransformer
The invention provides a driving circuit and method for providing power to an LED light source, and a power converter. The driving circuit comprises a voltage filter, a transformer and a controller. The voltage filter receives and filters an input voltage to provide a stable voltage. The transformer converts the stable voltage into an output voltage to provide power to a light source. The controller generates a driving signal to make a switch work alternatively between a first state and a second state. The controller controls time durations of the first state and the second state, such that an input current decreases to a predetermined level during the second state and increases to a peak level proportional to the input voltage during the first state. The controller controls the ratio of time in the first state to time in the second state to adjust an output current flowing through the light source to a target level. According to the invention, the current control precision is improved, power factors of the driving circuit are corrected, the quality of power supply is improved, and line frequency interference of lighting of the light source is minimized.
Owner:AOTU ELECTRONICS WUHAN
Buck/Boost converter for photovoltaic system
InactiveCN104638918AQuality improvementEasy to controlDc-dc conversionPhotovoltaic energy generationPower flowPower factor
A Buck / Boost converter for a photovoltaic system is characterized in that DC voltage output by a photovoltaic array of a photovoltaic system can be converted into adjustable DC power, having continual input / output current and large output voltage range, through a Buck and Boost type DC / DC chopper circuit, output voltage is selectively greater than or less than input voltage, and a power factor of the converter is corrected by adjusting running state of a switch tube.
Owner:TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
Rectifier and control method thereof
ActiveCN107465353ACorrection circuit lowEasy to controlAc-dc conversion without reversalEfficient power electronics conversionPhase currentsEngineering
The invention discloses a rectifier and a control method thereof, and belongs to the technical field of high power factor rectification. The rectifier comprises a three-phase voltage source circuit (1), a three-phase uncontrolled rectification circuit (2), two symmetric boost circuits (3), a third harmonic voltage generation circuit (4) and an H-bridge boost power factor correction (PFC) circuit (5), wherein double half-wave boost PFCs respectively generate steamed bread wave phase current waveforms at 30-150 degrees and 210-330 degrees within a period, a waveform compensation circuit can be switched to the corresponding phase when a certain phase current lacks, the phase current waveform which is insufficient is compensated, so that an input current is changed to a standard sine wave, and a converter works in a unit power factor rectification state. The rectifier can be used for a three-phase AC / DC conversion circuit having the PFC function, and the topological structure is simple and is convenient to control and easy to implement.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Working method of chain type SVG device suitable for correcting power factor
ActiveCN104467397ACorrected power factorCorrecting the problem of power factor dropEfficient power electronics conversionPolyphase network asymmetry elimination/reductionPower factorCarrier signal
The invention relates to a working method of a chain type SVG device suitable for correcting the power factor. The chain type SVG device comprises a multi-H-bridge-connected multi-level inverter, an automatic bypass circuit, a sampling circuit, a split-phase current independent control circuit and a pulse width modulation circuit. When a damaged H bridge unit circuit is bypassed, the pulse width modulation circuit is suitable for changing the carrier frequency of carrier wave and triangular wave phase-shifted SPWM of an H bridge power module where the damaged H bridge unit circuit is located so as to obtain pulse modulation waveforms of carrier wave and triangular wave phase-shifted SPWM corresponding to the number of remaining H bridge unit circuits in the H bridge power module.
Owner:JIANGSU LIPU ELECTRONICS & TECH
Display apparatus and electronic apparatus
ActiveUS20210057989A1Boost voltageCorrected power factorTelevision system detailsEfficient power electronics conversionComputer hardwareConverters
Disclosed are a display apparatus and an electronic apparatus, the display apparatus including: a main body including a display and a connector; and an adapter connectable to the main body and configured to supply power to the connected main body, the adapter including: a transformer configured to boost an input first alternating current (AC) voltage, a switch including a switching device configured to switch a current flowing in the transformer, a controller configured to control the switching device to output a second AC voltage boosted by the transformer, and the main body including a power factor correction (PFC) converter configured to correct a power factor of the second AC voltage output from the adapter and output a direct current (DC) voltage.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Method of using a high reactance, inductor transformer to passively reduce flickering, correct power factor, control LED current, and eliminate radio frequency interference (RFI) for a current-driven LED lighting array intended for use in streetlight mesh networks
InactiveUS20190261475A1Improve cooling effectImprove power factorMechanical apparatusTransformersPower factorTransformer
A circuit for powering an LED lighting array, the circuit comprising: a transformer for receiving AC line current and stepping down the voltage; one of a rectifier bridge or tapped secondary windings of the transformer paired with steering diodes, for providing a varying DC current; an inductor for receiving the varying DC current so as to smooth out the varying DC current with respect to both voltage and current; and a electrical connection for directing the smoothed-out DC current to the LED lighting array to power the LEDs.
Owner:GRADY JOHN K
Electrolyser applicable to titanium cathode plates
ActiveCN103103575AIncrease profitCorrected power factorFlexible AC transmissionPhotography auxillary processesIon-exchange membranesTitanium
The invention relates to an electrolyser applicable to titanium cathode plates. The electrolyser comprises a electrolyser body, wherein ion exchange membranes are arranged in the electrolyser body and are used for partitioning the electrolyser body into anode chambers and cathode chambers, and a discharging funnel is further arranged at the bottom of the electrolyser body and is connected with the cathode chambers; the titanium cathode plates are arranged between the anode chambers and the cathode chambers; the discharging funnel is connected with a liquid outlet pipe so as to discharge electrolysis waste liquid; and a collection bin which is suitable for collecting precipitated metal is arranged at the bottom of the discharging funnel, and the entrance of the collection bin is connected with the bottom of the discharging funnel. According to the electrolyser, the precipitated metal is collected by the collection bin, so that the precipitated metal can all be collected, the electrolysis operation and the operation collection are separated from each other and are independent from each other, and the electrolysis efficiency is increased.
Owner:ENG EQUIP CO LTD SUZHOU SAI SIDE
Charger for electric vehicle
InactiveUS8901883B2Improve conversion efficiencySwitching loss can be suppressedBatteries circuit arrangementsVehicular energy storageSoft switchingVoltage range
Disclosed herein is a charger for electric vehicles, which has a wide output voltage range. The charger is a slow charger having an improved configuration to respond to a wide output voltage range as well as output change. The charger may achieve limited switching loss and reduced noise via soft-switching operation, thereby enabling high-efficiency large-power Power Factor Correction (PFC) and increasing conversion efficiency of a DC / DC converter.
Owner:HL MANDO CORP
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