505 results about "Power factor corrector" patented technology

The invention discloses a high-power all-gallium nitride LED driving power supply circuit which comprises an EMI filtering and rectifying circuit, a GaN active power factor correction circuit, a GaN half-bridge LLC resonant converter circuit and a GaN synchronous rectifying and filtering circuit. The PFC and LLC combined control module integrates a power factor correction function and a resonance circuit frequency regulation function, the GaN active power factor correction circuit is connected with the PFC and LLC combined control module to realize power factor correction, and the GaN half-bridge LLC resonant converter circuit is connected with the PFC and LLC combined control module to realize output power regulation; and a constant-current voltage-limiting feedback circuit for outputting current and voltage detection feedback is arranged between the GaN synchronous rectification filter circuit and the PFC and LLC combined control module. The advantages of high efficiency of the GaN switching tube and high working frequency of the circuit are utilized, so that power loss and heat dissipation requirements are reduced, and the efficiency and power density of the LED power supply are improved. The invention has the advantages of high efficiency, high power density, high reliability and the like.

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 three-phase single-stage isolation rectifier and a power factor correction method thereof, and belongs to the technical field of switching power supplies. The three-phase single-stage isolation rectifier comprises a low-pass filtering unit, a sector selection unit, a DC / DC high-frequency conversion unit and a compensation conversion unit, wherein the low-pass filtering unit is connected with a three-phase alternating current, and the DC / DC high-frequency conversion unit is connected with a direct-current load; the sector selection unit comprises a first bridge circuit and a switching circuit, the compensation conversion unit comprises a power frequency switching unit and a high-frequency converter, the first input end of the power frequency switching unit is connected with a first terminal P, the second input end of the power frequency switching unit is connected with a third terminal Y, the third input end of the power frequency switching unit is connected with a second terminal N, and the second input end of the power frequency switching unit is connected with a third terminal Y; the output end of the power frequency switching unit is connected with the output end of the high-frequency converter, the first input end of the high-frequency converter is connected with the first terminal P, and the second input end of the high-frequency converter is connected with the second terminal N. The conversion efficiency of the isolation rectifier can be improved.

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.

A power factor corrector (PFC) is used to receive input power and supply power to a load via a DC / DC converter. A method of controlling a PFC is executed by a PFC controller used to control the PFC, where the PFC controller includes a voltage controller. The method includes receiving a first signal transmitted from a DC / DC controller used to control the DC / DC converter, where the first signal indicates the load, deriving a second signal based on the first signal, where the second signal is an expected output control signal of the voltage controller under the load indicated by the first signal, and configuring the voltage controller according to the second signal so as to keep an output voltage Vbulk of the PFC to the DC / DC converter stable.

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.

The invention provides a three-phase single-stage AC / DC converter for realizing high-frequency isolation power factor correction, and relates to the technical field of converters. The three-phase single-stage AC / DC converter comprises three AC modules with transformers, three DC modules, a fifth switch and two switch groups satisfying a bidirectional current path, and each of the three AC modules with the transformers comprises a first inductor, an intermediate capacitor, a second inductor and a transformer; when the three-phase single-stage AC / DC converter works, current in the three DC modules flows to the second port from the third port, and flows to the first port from the second port. And two switch groups satisfying a bidirectional current path are in complementary conduction with the fifth switch. The three-phase single-stage AC / DC converter provided by the invention is simple in circuit structure, adopts a one-stage architecture, saves the number of devices of the circuit under the condition of realizing power factor correction and boost and buck conversion, and greatly reduces the cost while improving the system efficiency and reducing the system volume.

In one embodiment, a multi-level, bridgeless boost power factor correction (PFC) device, comprising: a circuit comprising an inductor, and at least a first pair and a second pair of switches and a capacitor arranged in a flying capacitor, totem-pole configuration; and a control circuit 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 is configured to: for a first half line cycle, drive a first switch of each pair during an entire interval of the first half-line cycle and a second switch of each pair for less than the entire interval; and for a second half-line cycle, drive the first switch of each pair for less than an entire interval of the second half-line cycle and the second switch of each pair during an entire interval of the second half-line cycle.

A multi-battery bidirectional charging and discharging system supporting pulse charging and discharging and a control method thereof belong to the field of power electronics, and the bidirectional charging and discharging system comprises a power factor correction (PFC) stage composed of a three-phase bridge type full-control circuit, a direct current-direct current (DC-DC) converter stage and a plurality of switching device groups. The intermittent characteristic of the pulse charging current is utilized, different battery packs are charged and discharged reasonably and alternately by staggering the conduction interval of the pulse current, the current and voltage fluctuation of the alternating current power supply side in the energy flowing process can be reduced, and the influence of the system on the stability of a power grid or other power supplies is reduced. The invention supports pulse charging and discharging, and can reduce the polarization effect of the battery, prolong the service life of the battery, improve the charging efficiency, reduce hardware equipment required by charging and reduce the cost. The system allows bidirectional flow of energy between the alternating current side and the direct current side of the system, is controllable in power, supports V2G application, and can be used for a scene in which a battery is charged or discharged by using pulse current and continuous current.

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 invention relates to the technical field of power factor correction, and discloses a Boost type PFC circuit control method based on dual-bandwidth voltage loop control. Firstly, the voltage error and the current change rate of two state variables are monitored in real time; and then dividing the voltage loop bandwidth into a high bandwidth mode and a low bandwidth mode, then setting thresholds of a voltage error and a current change rate, and according to whether the voltage error and the current change rate exceed the thresholds or not or return to the thresholds, performing bandwidth switching in a self-adaptive manner by the system. And finally, delay switching is added, and bandwidth switching is performed only when the actual Tdelay meets switching conditions all the time within the delay time, otherwise, judgment is performed again.

The invention provides a power factor correction circuit and a control method thereof, and a computer readable storage medium, the power factor correction circuit comprises an inductor module, a power regulation module, a switch module and a control module, the inductor module comprises a first inductor and a second inductor which are connected in series, the power regulation module is connected to the inductor module, and the switch module is connected to two ends of the second inductor. The control module is connected to the power adjusting module and the switch module. The second inductor can be controlled to be connected or not connected through the switch module according to the size of the load, so that the total connection inductance value of the inductor module is reasonably adjusted, the power adjusting module can be started or closed according to the size of the load, and therefore the power adjusting efficiency is improved. According to the power factor correction circuit, the working modes of the power factor correction circuit can be reasonably adjusted according to the size of the load, such as a large inductance value or small inductance value mode and a power adjustment high-frequency operation or closing mode, the inductance loss and the switching loss can be reduced on the premise of meeting power factor correction, and the system energy efficiency is improved.

A current sampling circuit for a bridgeless power factor corrector is provided. The current sampling circuit comprises a sampling resistor, a first and second current sampling modules. In the first and second current sampling modules, primary windings of transformers are respectively serially connected to a first and second fast switches of the bridgeless power factor corrector. In a positive half cycle of the AC power, a second sampled current phase switching unit is turned on to form a second sampling circuit, and a first main current freewheeling unit is turned on to form a freewheeling path of a first transformer. In a negative half cycle of the AC power, a first sampled current phase switching unit is turned on to form a first sampling circuit, and a second main current freewheeling unit is turned on to form a freewheeling path of a second transformer.

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 direct current charging piles, in particular to a direct current bus monitoring system of a direct current charging pile, which comprises a monitoring module, a data processing module, a power factor correction module, a circuit diagnosis module based on topology analysis and a communication and early warning module, the monitoring module monitors operation parameters of a direct-current bus of the direct-current charging pile in real time. The data processing module collects and processes the monitored operation parameters of the DC bus. The power factor correction module monitors and adjusts the power factor of the DC bus in real time. The circuit diagnosis module based on topology analysis performs real-time structure analysis on the direct-current bus and detects topology change and faults in a circuit; the communication and early warning module sends out an early warning signal when an abnormal condition is detected. According to the invention, the system can find and process abnormal conditions in time, and the operation efficiency and stability of the system are improved.

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.

An automotive on-board charger topology includes an inverter, an electric machine, and a rectifier that together perform functions such as power factor correction usually performed by a collection of multiple components. This topology also includes a set of contactors that isolate a battery from other components of the charger based on the contactors' configuration.

The invention discloses a control method, a control device, a medium, a processor and a switching power supply, and the control method comprises the steps: the driving pulses of a switching tube S1 and a switching tube S2 are complementary, and the duty ratio adjustment range is [0, 1]; driving pulses of the switching tube S3 and the switching tube S4 are complementary, and the duty ratio adjusting range is [0, 1]; the power factor correction of the alternating current side is realized by adjusting the duty ratio of a switching tube S1 and the duty ratio of a switching tube S3, and the adjusting strategy is as follows: when the instantaneous value of an alternating current voltage source is greater than or equal to 0, the driving pulse of the switching tube S3 lags behind the switching tube S1, the phase difference between the driving pulse of the switching tube S1 and the driving pulse of the switching tube S3 is theta 1, and the adjusting range of theta 1 is [0, 180 degrees]; when the instantaneous value of the alternating current voltage source is smaller than 0, the driving pulse of the switching tube S3 is ahead of the switching tube S1, the phase difference between the driving pulse of the switching tube S1 and the driving pulse of the switching tube S3 is theta 2, and the adjusting range of theta 2 is [-180 degrees, 0]. According to the invention, switching tubes can be reduced, the cost is reduced, and the ripple of PFC inductive current is reduced.

The embodiment of the invention provides a power supply distribution method, a power supply distribution circuit, a storage medium and electronic equipment, and the power supply distribution method comprises the steps: carrying out the rectification conversion of at least two AC power supplies through at least two rectification units, so as to output a first DC power supply, each rectification unit comprises an automatic conversion unit and a power factor correction unit, and the number of the rectification units is consistent with that of the alternating current; receiving the first direct-current power supply through at least one step-down conversion unit, and adjusting the voltage corresponding to the first direct-current power supply to generate a second direct-current power supply; the second direct-current power supply is distributed to a plurality of power supply rails through a power supply redistribution module, and the power supply rails are used for supplying power to a target processor.

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.

The invention relates to an active power factor correction device, in the active power factor correction device, an average current controller and a feed-forward compensation controller are respectively used for obtaining a first duty ratio and a second duty ratio, a duty ratio processor is used for superposing the first duty ratio and the second duty ratio to obtain a total duty ratio, the pulse width modulation controller is used for generating a pulse width modulation signal for controlling the switching device according to the total duty ratio, the second duty ratio is related to the sum of inductive currents sampled for multiple times in a power frequency period, and the sum of the inductive currents changes along with the load power of the main circuit. Therefore, the second duty ratio can reflect the dynamic change of the load power, the total duty ratio is obtained by superposing the first duty ratio and the second duty ratio, the feedback can be enhanced when the load power changes, and compared with the control by only using the average current method, the control capability on the output voltage and the input current is improved, and the control efficiency is improved. And a better power correction effect can be realized.

The invention relates to the technical field of intelligent lighting, and discloses a multi-street-lamp digital power supply networked control system and a remote management method, and the system comprises digital power supply modules which are installed at each street lamp unit and are used for carrying out the power supply and real-time monitoring of street lamps, and each digital power supply module comprises a power factor correction unit, a real-time monitoring unit and an execution unit; the data acquisition module is used for acquiring voltage, current and power electrical parameters of each street lamp unit and acquiring external environment data of environment brightness, temperature and humidity through environment sensing equipment; the digital power supply module is adopted, reactive power is optimized through the power factor correction unit, electric energy loss is reduced, and the power supply efficiency of the whole street lamp system is improved. Compared with a traditional analog power supply system, the system has remarkable advantages in the aspect of energy efficiency, the digital power supply module can accurately monitor voltage, current and power, and the running state of the street lamp is optimized through real-time data feedback.

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.