321 results about "Power factor corrector" patented technology

The invention provides a power factor correction method and system for AC-DC conversion of a server power supply, and relates to the technical field of server power supplies, and the method comprises the steps: collecting an input AC signal and a DC bus output signal, calculating a real-time power factor value, constructing a compensation function based on the power factor value, and calculating a deviation value; and generating a compensation parameter matrix through recursive calculation, processing a direct current output signal by adopting an adaptive filtering algorithm, fusing the direct current output signal with the compensation parameter matrix, calculating to obtain a current adjusting signal and a duty ratio adjusting signal, and accurately adjusting a power factor.

The present disclosure provides a totem-pole PFC converter and a control method thereof. The totem-pole PFC converter includes: a plurality of phase legs connected in parallel; a plurality of boost inductors, wherein each boost inductor is connected between the corresponding input terminal and the midpoint of the corresponding phase leg; a plurality of capacitors; a diode leg connected with the plurality of phase legs in parallel, wherein the midpoint of the diode leg is connected with the neutral terminal; an output filter connected with the diode leg in parallel; a T-type leg connected between the midpoint of the diode leg and the midpoint of the output filter and including two active switches connected in series; and a control system configured to turn the two active switches on around AC voltage zero crossings during non-unity power factor operation.

The invention relates to the technical field of generator control, and discloses an intelligent vehicle-mounted high-power self-generating control method and system. The method comprises the following steps: acquiring operating parameters of a generator set, performing high-precision digital processing, realizing constant-rotating-speed control through cooperation of multiple controllers based on a rotating-speed fluctuation characteristic value, performing power factor correction through coordinate transformation and active rectification to obtain a direct-current bus voltage, performing precise voltage stabilization by adopting a multi-phase interleaving converter, and outputting the direct-current bus voltage. And finally, outputting a high-quality three-phase alternating-current power supply through space vector modulation and closed-loop feedback control. The technical problems in the prior art that the power supply quality control capability is insufficient, the intelligent level is low, the environmental adaptability is poor, the load adaptability is limited, and the maneuverability is limited are solved.

A power factor correction (PFC) control circuit includes a pulse-width modulation (PWM) circuit configured to control a switch of a switching power converter. The PFC control circuit further includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter and to control a beginning of a switching cycle of the switching power converter based on the selected conduction mode. In addition, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

An on board charger for a vehicle including an electric machine and a battery system includes a power inverter and a DC-DC converter. A filter including first and second inputs is selectively connected to an AC source and first and second outputs. The first output of the filter is connected to one of the first node, the second node, and the third node between switches of phase legs of the power inverter. A switching device includes a first terminal connected to the one of the first node, the second node, and the third node, a second terminal connected to a second output of the filter, and a third terminal connected to one of the first, second, and third phase windings of the electric machine corresponding the one of the first node, the second node, and the third node.

A single-stage isolation type three-phase Cuk rectification circuit comprises a three-phase AC power supply in star connection, three bridgeless isolation type Cuk rectification circuit bridge arm modules with the same structure, an output filter capacitor Co and a load RL. The input ends of the three bridgeless isolation type Cuk rectifier circuit bridge arm modules are line voltages of a three-phase alternating current power supply, and are uab, ubc and uca respectively; the output ends of the three bridgeless isolation type Cuk rectifier circuit bridge arm modules are connected in parallel, and the parallel output ends are connected in parallel with the output filter capacitor Co; and the output filter capacitor Co is connected in parallel with the load RL. The converter has the functions of buck-boost output, power factor correction and electrical isolation, meanwhile, each Cuk rectification circuit bridge arm is of a bridgeless structure, input and output current is continuous, the power factor is high, efficiency is high, positive wide-range output voltage is achieved, the current stress of a switching device is small, and the converter has rich application scenes.

A battery pack charger may include a housing. The battery pack charger may include a battery pack interface provided on the housing and configured to removably receive a battery pack. The battery pack charger may include a power input. The battery pack charger may include an LLC converter including a dual transformer electrically connected between the power input and the battery pack interface. The battery pack charger may include a power factor correction (PFC) boost converter electrically connected between the power input and the battery pack interface. The battery pack charger may include an input inrush current control circuit electrically connected between the PFC boost converter and the battery pack interface.

A power factor correction (PFC) converter includes an inductor to electrically connect to an alternating current (AC) source, a first set of switches to be electrically connected to a terminal of the inductor at one end and to a negative output terminal at an opposite end, and a second set of switches to be electrically connected to the terminal of the inductor at one end and to a positive output terminal at an opposite end. An output voltage of the PFC converter is between the positive output terminal and the negative output terminal. Two or more flying capacitors are connected between different pairs of adjacent ones of the first set of switches and corresponding adjacent ones of the second set of switches. A controller controls duty cycle of the first set of switches and the second set of switches based on balancing voltages of the two or more flying capacitors.

A power supply system with power factor correction, includes: an AC rectifier, a power factor correction (PFC) conversion circuit, an asymmetric half-bridge (AHB) flyback converter and a communication protocol power delivery (PD) interface. When a power level of an adapter output power is lower than a power threshold, and a converted voltage of a converted power is higher than a first voltage threshold, the communication protocol PD interface generates a disable signal to disable a PFC conversion of the PFC conversion circuit, when the PFC conversion is disabled, the PFC conversion circuit operates a bypass coupling operation, as thus, the converted voltage is equal to a rectified voltage of a rectified power.

Apparatuses, systems, and methods for power factor correction (PFC) converters are provided, including PFC converters driven at optimal efficiencies. An exemplary PFC converter may comprise input circuitry receiving an input voltage, output circuitry providing an output voltage, a boost circuitry electrically coupled to the input circuitry and output circuitry, and a switch. The boost circuitry includes a capacitor. The switch is configured to operate in an on state and an off state and operating in the on-state causes charging of the capacitor and operating in the off-state causes discharging of the capacitor. A PFC converter controller control the switch to change states at a first ratio associated with one or more time periods for the on state and one or more periods for the off state, and the first ratio also associated with a first efficiency threshold associated with the on state.

A power factor correction (PFC) boost converter system and method of operation includes a control system connected to a bridgeless PFC converter which includes a first voltage measurement circuit connected to measure a first voltage, a second voltage measurement circuit connected to measure a second voltage, and a third voltage measurement circuit connected to measure a third voltage, where the control system is connected to compute a reconstructed PFC input current signal from the first, second, and third voltages and to output a set of control signals for controlling the PFC converter based on the reconstructed PFC input current signal and the boosted output voltage.

A method is for adaptively controlling a charging module that converts three-phase AC input to DC output with improved power factor correction. The method includes performing Clarke and Park transforms on input three-phase AC voltages to obtain d-q axis components, measuring and transforming boost inductor currents to obtain current axis components, generating control values through current-loop and voltage-loop modules based on target and measured values, and synthesizing PWM signals to control switching operations. The method features adaptive phase angle computation using a proportional-integral controller that responds to load variations in real-time. The control system maintains high power factor under varying load conditions by continuously adjusting the phase reference based on the q-axis voltage error. This approach minimizes power losses, reduces harmonic distortion, and ensures stable operation across the full operating range of the charging module while maintaining unity power factor.

The invention provides a vehicle-mounted charging circuit, a charging method and a charging system for an electric vehicle facing a 800V power battery, and relates to the field of manufacturing of related facilities of the electric vehicle, the circuit comprises a power factor correction module, a primary side power conversion module, a high-frequency isolation transformer, a bipolar charging module and a power battery equalization module; the input side of the power factor correction module is connected with an alternating current power grid, and the power factor correction module is used for rectifying alternating current into direct current; the primary side power conversion module is used for converting the direct current output by the power factor correction module into high-frequency alternating current; the high-frequency isolation transformer comprises at least two windings, and the two windings are connected with the primary side power conversion module and the bipolar charging module respectively; the bipolar charging module is connected with a 800V power battery, and the 800V power battery comprises two groups of 400V battery packs; the power battery equalization module is used for equalization management of two groups of 400V battery packs, and has the advantages of improving charging speed and efficiency of 800V power batteries and reducing equalization difficulty and cost.

The invention relates to the technical field of welding equipment manufacturing, and provides a lithium electric welding machine integrated with a power factor correction and active rectification structure. The welding machine comprises a main control chip, a lithium battery power supply module, a welding power control module, a charging management module, a voltage safety control module, a multi-stage isolation sampling module, an asymmetric half-bridge power supply module and a man-machine interaction module. The welding power control module adopts double MOS tube complementary driving to realize active rectification, and the chopping unit adjusts welding current through pulse width modulation. The charging management module is integrated with a power factor correction unit and works in linkage with the welding power control module, and the bus voltage stability is optimized. The voltage safety control module dynamically switches welding machine terminal voltage to a safety threshold value, the multi-stage isolation sampling module achieves battery voltage isolation sampling, and the man-machine interaction module provides a parameter digital setting and displaying function.

The application discloses a power factor correction module, a controller and an electrical equipment, and relates to the technical field of power factor correction. The power factor correction module comprises a substrate, a rectification circuit, a switching circuit, a direct current output terminal, a voltage transformation input terminal and a high-voltage access terminal. The rectification circuit and the switching circuit are formed on the substrate. The direct current output terminal is electrically connected with the rectification circuit. The voltage transformation input terminal is electrically connected with the switching circuit. The high-voltage access terminal is connected with the output terminal of the switching circuit. The high-voltage access terminal is used for accessing an external load. The direct current output terminal and the voltage transformation input terminal are respectively used for accessing two ends of an external inductor, so that the external inductor and the switching circuit form a PFC loop when the external inductor is accessed. In this way, by integrating the rectification circuit and the switching circuit on the same substrate, the number of elements of the rectification circuit and the PFC circuit is reduced, the volume of the rectification circuit and the PFC circuit is reduced, and the installation convenience of the rectification circuit and the FPC circuit is improved.

A wireless power transfer facility includes: a power factor correction device that converts AC front-stage input power received from a commercial power source into DC front-stage output power and has a plurality of output terminals for outputting the front-stage output power; a plurality of inverters that are respectively connected to the output terminals of the power factor correction device and convert DC rear-stage input power including the DC front-stage output power received from the output terminals into AC rear-stage output power; a plurality of power transmission coils that are respectively connected to the plurality of inverters and receive the rear-stage output power; and a control device that performs control so that the front-stage input power output to the power factor correction device does not exceed allowable power of the commercial power source.

The application provides a power factor correction circuit and electronic equipment, and belongs to the technical field of electronics. The power factor correction circuit comprises a power supply unit, a power factor correction unit, a compensation unit and a controller. The compensation unit comprises an amplifier and a ground capacitance. One end of the ground capacitance is electrically connected with the output end of the amplifier, and the other end of the ground capacitance is grounded. The controller is used for outputting a first control signal to the power factor correction unit, and is used for inputting a second control signal to the amplifier. The second control signal makes the amplitude difference between the voltage of the ground capacitance and the ground voltage of the input end of the switch tube within a preset amplitude difference range, the phases opposite and the phase difference within a preset phase difference range. The application has the effect of reducing electromagnetic interference.

Disclosed herein is a power control system of a processing plant, the power control system comprising: a control system configured to determine power characterisation data of the power supply to one or more loads in the processing plant; a power factor correction system configured to apply a power factor correction to the power supply; a vibration sensor system configured to generate vibration data of one or more locations in the processing plant and to transmit the vibration data to the control system; and a flowrate sensor system configured to generate flowrate data of fluid in one or more conduits in the processing plant and transmit the flowrate data to the control system; wherein the power factor correction applied to the power supply by the power factor correction system is generated in dependence on the determined power characterisation data and at least one of the vibration data and flowrate data.

The application discloses a PFC circuit and an electric flame stove suitable for direct current and alternating current, comprising a voltage switching control module, a filter module, an inverter voltage boosting module, a full-bridge rectifying module and a power factor correction module. The voltage switching control module detects input voltage and controls the on-off of the filter module and the inverter voltage boosting module respectively, realizing the adaptation of 48V direct current and 220V alternating current voltage input. The power factor correction module adopts a Boost (voltage boosting) type active PFC topology, the high-frequency on-off control of the switching tube Q7 / Q8 is realized through the control chip U2 / U3, the input current waveform follows the input voltage waveform, the power factor is improved to above 0.95, the switching tube Q8 is adopted to replace the diode in the prior art, there is no voltage and current loss when the switching tube is turned on, the stable current and voltage output are ensured, the voltage / current waveform is consistent, and the power factor is improved.

The invention relates to a totem pole bridgeless power factor correction module and device, a power supply and a power supply system, the power factor correction module is used for performing power factor correction on alternating current input by an alternating current power supply, and the power factor correction module comprises a first transistor, a second transistor, a third transistor, a fourth transistor and an inductor, a first adjusting assembly and a second adjusting assembly are connected to the third transistor and the fourth transistor in parallel respectively, at least one of the first adjusting assembly and the second adjusting assembly is a switch, and the switches in the first adjusting assembly and the second adjusting assembly are conducted before the transistors connected in parallel are switched on when the alternating current power supply crosses zero. According to the embodiment of the invention, the switches in the first adjusting assembly and the second adjusting assembly are configured to be switched on before the transistors connected in parallel when the AC power supply crosses zero, and the connection point of the third transistor and the fourth transistor can be slowly discharged, so that the common-mode switching speed is slowed down, the common-mode interference is reduced, and the leakage current peak is reduced.

An integrated powertrain for a vehicle is disclosed herein. The first integrated circuit (111a) forms by integration of a first rectifier (103c) of an on-board charger (OBC) (103) and a second inverter (107a) of an auxiliary power module (APM) (107). Further, a second integrated circuit (111b) forms by integration of a power factor correction (PFC) rectifier (101) and a first inverter (103a) of the OBC (103). Furthermore, the second integrated circuit (111b) is configured to draw power from a utility grid (100) at unity power factor and supply the power to a first transformer (103b) of the OBC (103). Moreover, the first integrated circuit (111a) is configured to draw power from the second integrated circuit (111b) and configured to participate in independent charging of a traction battery (105) and an auxiliary battery (109) along with supplying power to auxiliary loads.

The present application discloses a control circuit, a control method and a charging and discharging device for a power factor corrector, and relates to the technical field of charging and discharging devices. The control circuit of the power factor corrector includes: a temperature detection module for detecting the temperature of the power factor corrector; a feedback detection module for obtaining the feedback voltage of the power factor corrector; a signal processing module for outputting a first timing control signal when the detected temperature is greater than a preset temperature; and a switch control module for outputting a second timing control signal when the feedback voltage is greater than a preset feedback voltage, and vice versa; and a switch control module for controlling the operation of high-frequency switching devices and low-frequency switching devices according to the first timing control signal, the second timing control signal or the third timing control signal. Based on the solution of the present application, the local hot spots of the high-frequency switching devices in the power factor corrector can be reduced, and the output time of the peak power of the charging and discharging device during the charging process and the user experience can be improved.

The application discloses an ACDC isolation converter topology, and relates to the technical field of power electronic converters.The EMI filter module of the topology suppresses the differential mode and common mode interference of alternating current, and after rectification, the APFC boost module actively performs power factor correction on the alternating current, and the voltage of the direct current bus is raised; the switching control module controls the complementary turn-on of the half-bridge switching tube, and sets a dead time; the half-bridge inverter resonance module chops the direct current input of the direct current bus into a square wave signal, the series resonance current is formed by the equivalent inductance of the primary side of the integrated inductive transformer, and electrical isolation is simultaneously completed; the alternating current energy output by the secondary side of the integrated inductive transformer is rectified by the full-bridge synchronous rectification module to obtain direct current output; the switching frequency of the half-bridge switching tube is adjusted by the switching control module, and constant current control is performed.The application can reduce the EMI filter loss, switching loss, rectification loss and feedback cost while ensuring high PF and low THD, and realizes high-efficiency constant current output.

The utility model discloses a packaging structure. The packaging structure comprises a rectification unit; a power factor correction unit; the power unit comprises a low-side driving chip, a high-side driving chip, a plurality of low-side transistors driven by the low-side driving chip, and a plurality of high-side transistors driven by the high-side driving chip; a lead frame having a plurality of pins; the plastic package body wraps the lead frame, the rectification unit, the power factor correction unit and the power unit; the plastic package body comprises a first side edge and a second side edge which are opposite to each other, and a third side edge and a fourth side edge which are opposite to each other, the plurality of pins extend to the outside along the third side edge and the fourth side edge of the plastic package body, and the power factor correction unit is located between the rectification unit and the power unit. The three units are integrated in the same packaging structure, so that the packaging structure has the functions of rectification, power factor correction and inversion, the peripheral wiring is simplified, the cost is reduced, and the circuit reliability of the packaging structure is improved.

A device, such as a resonant power converter as discussed herein, may comprise the following features: a first transformer winding; a sensing circuit arrangement effective in sensing a first energy supplied to the first transformer winding by an input voltage; and a switching circuit arrangement effective in applying a power factor correction associated with converting the input voltage into an output voltage derived from an output of a second transformer magnetically coupled to the first transformer winding, the power factor correction applied comprising controlling a flux of the first energy from the input voltage to the first transformer winding.

The application provides a voltage stabilizing circuit, a motor control circuit, a motor and an electrical appliance. The voltage stabilizing circuit is used for stabilizing a working circuit, and comprises: an energy processing unit connected in parallel with the working circuit and capable of stabilizing the working circuit; a switching unit connected between the working circuit and the energy processing unit and used for controlling the on-off of the energy processing unit and the working circuit; and a control unit connected with the switching unit and used for controlling the state of the switching unit according to the output power of the working circuit, so that the energy processing unit is connected to or disconnected from the working circuit. The voltage stabilizing circuit has the functions of power factor correction and surge voltage absorption, and can also maintain the minimum value of the bus voltage.

The invention provides a power factor correction method and circuit and power supply equipment, and relates to the technical field of electronic circuit control. The power factor correction circuit comprises a PFC main circuit which comprises at least one main switch; the control circuit is electrically coupled to the PFC main circuit; the compensation circuit comprises a sampling circuit, an inverting circuit and an adjusting circuit, the inverting circuit generates an inverting signal according to a first sampling signal and a second sampling signal collected by the sampling circuit, and the first sampling signal and the second sampling signal reflect the input voltage and the output voltage of the PFC main circuit respectively; the adjusting circuit generates different compensation additional values according to different input voltages, generates compensation signals corresponding to the current input voltage level according to the inversion signals and the compensation additional values and outputs the compensation signals to the control circuit, and the control circuit adjusts the conduction time of the main switch at the input voltage zero crossing point according to the compensation signals. THD optimization under different input voltages can be realized.

A method of operating a circuit is disclosed. The method includes providing an interleaved power factor correction (PFC) converter circuit; determining a switching frequency of the interleaved PFC converter circuit; setting a phase shift of the interleaved PFC converter circuit at a first phase shift when the switching frequency of the interleaved PFC converter circuit is below or at a first switching frequency; setting the phase shift of the interleaved PFC converter circuit at a second phase shift when the switching frequency of the interleaved PFC converter circuit is greater than the first switching frequency but less than a second switching frequency; and setting the phase shift of the interleaved PFC converter circuit at the first phase shift when the switching frequency of interleaved the PFC converter circuit is greater than the second switching frequency.

This invention discloses an air conditioner and its compressor control method and device. The control method includes: when the compressor is in a field weakening control mode, acquiring the current three-phase current of the compressor; acquiring the current d-axis voltage and current q-axis voltage based on the current three-phase current; processing the current d-axis voltage and current q-axis voltage to obtain a processed voltage signal; multiplying the processed voltage signal by the reciprocal of an adjustment coefficient, and determining the product as a current adjustment bus voltage command; performing power factor correction control based on the current adjustment bus voltage command; further acquiring the current feedback modulation rate for field weakening control, limiting the current feedback modulation rate to obtain a current processed feedback modulation rate; determining the current field weakening control current based on the current processed feedback modulation rate; and executing field weakening control based on the current field weakening control current. Using this invention, the performance of the compressor in different control processes can be improved.

The invention discloses a vehicle-mounted charger and a vehicle. The vehicle-mounted charger comprises a power factor correction unit, a first inversion unit, an isolation transformation unit and a second inversion unit which are connected in sequence; the AC end of the power factor correction unit is connected with an external AC power supply and is used for rectifying and outputting AC input of the external AC power supply or rectifying and outputting AC to the external AC power supply; the first inversion unit is used for inverting alternating current input of an external alternating current power supply into high-frequency alternating current, the high-frequency alternating current is output to the second inversion unit in an isolated mode through the isolation voltage transformation unit, the high-frequency alternating current is inverted and rectified into high-voltage direct current through the second inversion unit, and the high-voltage direct current is output to a battery pack of a vehicle; high-voltage direct current output by a battery pack of the vehicle is converted into high-frequency alternating current through the second inversion unit and the isolation transformation unit, and the high-frequency alternating current is inversed and then is reversely rectified by the power factor correction unit and output to an external alternating current power supply. According to the invention, the resonance efficiency is improved, and the vehicle-mounted charger is more power-saving, more durable and faster in charging.