419 results about "Power factor corrector" patented technology

The invention relates to the technical field of charging piles, and provides a power factor correction method and system for a high-power charging module, and the method comprises the steps: obtaining a power grid input voltage, a power grid input current and an output load current, constructing an input power fluctuation map and a load dynamic response map, carrying out the subgraph matching and joint convolution, and obtaining a power factor correction result; and obtaining a response change index table and a fitting weight vector, generating a dynamic current regulation vector by using the response change index table and the fitting weight vector, and performing phase correction and waveform reconstruction on the power grid input current according to the dynamic current regulation vector. Through phase correction and waveform reconstruction, the amplitude and phase information of the power grid input current are strictly aligned, the power factor of the high-power charging module is improved, the harmonic interference of the input side is reduced, the electric energy transmission efficiency and the module operation stability are improved, and the problem that in a complex power grid environment, the power consumption of the high-power charging module is reduced is solved. The problem that the correction effect of the power factor is not stable due to the fact that fast-changing input current and voltage are difficult to deal with is solved.

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.

According to the temperature value calculation method, the air conditioner control method and the air conditioner, the temperature output function built in an intelligent power module is utilized, and the characteristic that the intelligent power module and a power factor correction module in an air conditioner driving board have the same or similar heat transfer structures is combined; and establishing a temperature calculation method based on the heat transfer model. The temperature (third temperature value) of the intelligent power module is calculated by obtaining the environment temperature (second temperature value) and the power value of the intelligent power module, and the accuracy of the heat transfer model is verified according to the temperature (third temperature value). And under the condition that the model verification is passed, further combining the power value of the power factor correction module and the environment temperature, and calculating the temperature (fourth temperature value) of the power factor correction module through a heat transfer model of the power factor correction module. According to the method, the temperature of the power device of the power factor correction module in the air conditioner driving board can be accurately calculated on the premise of not adding an additional temperature sensor.

This relates to an electric system for a motor vehicle, the vehicle including at least one power supply battery, the electric system including an electric charger intended to be connected, on the one hand, to the battery and, on the other hand, to an electric network outside the vehicle supplying an AC voltage or to electric equipment, and a microcontroller, the charger being able to charge the battery from an external electric network or to allow the battery to power the equipment, the charger including a power factor corrector circuit and a converter.

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 bridgeless power factor correction (PFC) control circuit includes a non-linear current sensor. The non-linear current sensor includes a non-linear shunt, a comparator, and a reference voltage circuit. The non-linear shunt includes a capacitor connection terminal and a ground terminal. The comparator includes a first input, a reference voltage input, and a zero-crossing detector output. The first is input coupled to the capacitor connection terminal. The reference voltage circuit is coupled to the reference voltage input.

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.

A power supply system includes a power factor correction converter circuit and an isolated power converter circuit, wherein the power factor correction converter circuit corrects the power factor of a rectified power to generate a first output power, and the isolated power converter circuit converts the first output power to generate a second output power. The isolated power converter circuit includes a transformer, and the transformer includes a primary winding, a secondary winding, and an auxiliary winding. The auxiliary winding generates an auxiliary voltage which is related to the second output power. When the auxiliary voltage is lower than a disabled threshold, indicating that the voltage of the second output power is lower than a threshold, the power factor correction converter circuit provides a bypassing connection from the rectified power to the first output power and stops correcting the power factor of the 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.

The invention discloses a wide-input single-stage Boost-LLC converter and a control method thereof, and relates to the field of power factor correction AC-DC converters. According to the wide-input single-stage Boost-LLC converter, a pulse frequency and pulse width hybrid modulation mode is introduced on the basis of basic pulse frequency modulation control, the voltage stress of a switching device can be reduced, and the input voltage range can be expanded; by introducing quasi-resonance control, the problem that the output of the single-stage AC-DC converter is seriously influenced by double power frequency ripples is solved, and the condition that the output voltage of the secondary side is unstable when the switching frequency is too low is suppressed by adopting a CLC filtering mode at the secondary side. The single-stage Boost-LLC converter has the beneficial effects that through a hybrid modulation mode, the single-stage Boost-LLC converter can realize wide-range input under the condition that the voltage stress requirement of a switching device is not high, double power frequency ripples on the output side are effectively reduced, the stability of the output voltage is ensured, only one-stage power conversion exists in a system, and the system is simple in structure and low in cost. The device has the advantages of small size, high efficiency and low cost.

In one embodiment, a multi-level, bridgeless boost power factor correction (PFC) device (50), comprising: a circuit (52) comprising an inductor (51), and at least a first pair and a second pair of switches and a capacitor (59) arranged in a flying capacitor, totem-pole configuration; and a control circuit (54) configured to drive the at least first and second pairs of switches in such a way as to reduce distortion in a line current, wherein for the first and second pairs of switches, the control circuit (54) is configured to: for a first half-line cycle, drive a first switch (53a, 55a) of each pair during an entire interval of the first half-line cycle and a second switch (53b, 55b) of each pair for less than the entire interval; and for a second half-line cycle, drive the first switch (53a, 55a) of each pair for less than an entire interval of the second half-line cycle and the second switch (53b, 55b) of each pair during an entire interval of the second half-line cycle.

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 invention provides a control method of a power supply circuit, a processing unit, the power supply circuit and a storage medium. The type of an input voltage signal on the electromagnetic compatibility unit is detected, and whether the first input voltage on the electromagnetic compatibility unit obtained through sampling of the voltage sampling unit is continuously reduced or not is detected; and if the input voltage signal is a direct-current voltage signal and the first input voltage is not continuously reduced, controlling the switch unit to be closed so as to ensure that the charging current of the power factor correction capacitor is smaller than the preset current after the current limiting unit is short-circuited. The charging current of the power factor correction capacitor is less than the preset current after the current limiting unit is short-circuited; the phenomenon of air switch error protection or power plug ignition corresponding to the power supply circuit is avoided, and the power failure risk of the whole power supply system is reduced.

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.

The invention discloses a photovoltaic air conditioner and a control method and device thereof. The control method comprises the steps that a photovoltaic power supply mode switching instruction is received, and the current output power of a photovoltaic module and the current power threshold value of the photovoltaic air conditioner are obtained and compared; when the current output power is greater than the current power threshold, executing a first control mode; when the current output power is smaller than or equal to the current power threshold value, a second control mode is executed; the first control mode comprises the steps that the state of a mains supply circuit is kept unchanged, the power factor correction function of the photovoltaic air conditioner is closed, and the compressor target frequency is determined according to the current direct-current bus voltage of the photovoltaic air conditioner and the compressor is controlled; the second control mode comprises the steps of disconnecting the mains supply circuit, determining the target frequency of the compressor according to the current direct-current bus voltage of the photovoltaic air conditioner and controlling the compressor. According to the invention, automatic switching of the power supply modes of the photovoltaic air conditioner can be realized, and the control intelligence of the photovoltaic air conditioner is improved.

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.

A circular current suppression method, a switch control device, and a power conversion system are disclosed, which convert a difference between a voltage converted from a common-mode current of several input currents of a power factor corrector and a bus-voltage difference into a reference current, convert a difference between a reference voltage and a total voltage into a total DC current, and add cosine even-numbered-harmonic components of the reference current based on the total DC current, a target current, and one of several input currents to calculate a compensation current that is converted into a voltage as one of at least one switching command output to the power factor corrector, thereby suppressing the circular current in a configuration of parallel power conversion modules.