544 results about "Power factor correction circuits" 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 discloses a power adapter parameter dynamic optimization method for prolonging the service life of equipment, and relates to the technical field of adapter performance optimization, and the method comprises the steps: monitoring and recording the output voltage, current and power factor parameter changes of a power adapter in real time under static and dynamic load conditions by using a test instrument; identifying the trend and reason of abnormal parameter change; performing thermal design optimization and temperature management on the power adapter; performing over-power and over-current limitation on the pulses one by one; introducing a power factor correction circuit; optimizing the switching frequency and the design of an output filter; a load line adjusting circuit is introduced, and space is reserved for dynamic ripples when output current jumps; and evaluating whether the optimization effect reaches an expected target or not. By introducing the power factor correction circuit and the load line adjustment circuit, the power factor of the power adapter is improved, the harmonic pollution is reduced, the stability of the output voltage of the power adapter is improved, and the performance of the power adapter under the dynamic load condition is improved.

A bidirectional on-board charger includes a direct current bus, two bus capacitors, a power factor correction circuit, and a controller. The power factor correction circuit includes: a first bridge arm; and three second bridge arms, separately connected in series between the positive electrode and the negative electrode of the direct current bus. The controller is configured to: control the first switch (K1) to be turned off, and control at least one of the second bridge arms to output a direct current to charge a power battery; or control the first switch (K1) to be turned on, and control a midpoint of at least one of the second bridge arms to output an alternating current to supply power to an alternating current load. A Vehicle power system and an electric vehicle are further disclosed. The charger reduces circuit costs.

The invention discloses a power factor correction circuit and a charger, and relates to the technical field of new energy automobiles, a mode switching module, a first compensation switch and a first compensation capacitor are arranged in the power factor correction circuit, and when it is detected that a power supply connected with the mode switching module is a single-phase alternating current power supply, the first compensation switch and the first compensation capacitor are switched on and switched off. Controlling the mode switching module to enter a single-phase charging state, connecting a single-phase alternating current power supply to the three-phase bridge rectifier module, and controlling the first compensation switch to be closed, so that the three-phase bridge rectifier module works in the single-phase charging mode; and harmonic compensation is carried out on the output current of the three-phase bridge rectifier module through the first compensation capacitor and the rectifier bridge arm connected with the third alternating current end. According to the invention, the technical problem of how to reduce the second harmonic current in the output current of the PFC converter of the vehicle-mounted charger and ensure the power density of the PFC converter is solved.

A power factor correction circuit for a boost converter comprises a voltage converting means and a voltage-to-time converting means. The voltage converting means converts a supply voltage based on a time period of a turn-on duration Ton and a turn-off duration Toff of the boost converter into an output voltage. The voltage-to-time converting means generates the turn-on duration Ton based on the output voltage from the voltage converting means. The power factor correction circuit adjusts the turn-on duration Ton substantially in accordance with the following relationship:Ton =TTon +T off⁢first⁢ parameter second⁢ parameterThe first parameter includes at least one first process-dependent parameter and the second parameter includes at least one second process-dependent parameter. The first process-dependent parameter and the second process-dependent parameter are same electrical characteristic associated with different circuit components in the power factor correction circuit.

A bidirectional high voltage AC-DC converter includes a primary three-phase three-level T-type power factor correction circuit, a full-bridge switching circuit connected to the primary three-phase three-level T-type power factor correction circuit output, an isolated capacitor-inductor-inductor-capacitor (CLLC) resonant tank connected to the full-bridge switching circuit, a T-type full-bridge output topology circuit connected to the CLLC resonant circuit, and a controller that controls one or more of the components of the bidirectional isolated high voltage AC-DC converter. The primary three-phase three-level T-type power factor correction circuit and the secondary three-level circuit include a split DC-link bus with respective voltages that are actively controlled by the controller. The CLLC resonant converter circuit includes an isolation transformer that electrically isolates the primary side from the secondary side of the bidirectional isolated high voltage AC-DC converter. A control method includes synthesizing, via a modified space vector pulse width modulation (SVPWM) scheme or a variable-amplitude double-carrier sine-triangle PWM with capacitor bank middle point voltage control, one or more output voltages of the front end three-phase three-level T-type PFC circuit, wherein the modified SVPWM scheme is based, at least in part on a nearest four vectors technique.

The invention relates to a charger, a charger control method and a vehicle. The charger comprises a magnetic integrated transformer, an AC-side single-stage conversion circuit, a high-voltage-side conversion circuit and a low-voltage-side conversion circuit. The first end of the alternating-current side single-stage conversion circuit is connected with an alternating-current side, and the second end is connected with a primary winding of the magnetic integrated transformer; the first end of the high-voltage side conversion circuit is connected with a high-voltage secondary winding of the magnetic integrated transformer, and the second end is connected with a power battery; the first end of the low-voltage side conversion circuit is connected with the low-voltage secondary winding of the magnetic integrated transformer, and the second end is connected with a low-voltage system. A power factor correction function can be realized through the alternating current side single-stage conversion circuit, a power factor correction circuit and a bus electrolytic capacitor can be omitted at the same time, and the service life of the charger is prolonged. In addition, the high-voltage side conversion circuit and the low-voltage side conversion circuit share one magnetic integrated transformer, so that the size of the charger is reduced, the consumption of power switch devices is reduced, and the cost and the highest power density are reduced to the maximum extent.

An automotive power system integrates a power factor correction circuit, an H-bridge power module, an externally excited synchronous machine, a traction inverter, and a traction battery. The system operates in two modes: driving and charging. In driving mode, power flows from the traction battery through the H-bridge power module and the traction inverter to the externally excited synchronous machine, enabling vehicle propulsion. In charging mode, power from an AC source is routed sequentially through the power factor correction circuit, the H-bridge power module, the synchronous machine, and the traction inverter.

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 multi-input power system receives at least two input power sources, and includes at least two filter-rectification circuits, a switching switch, a boost power factor correction circuit, a DC-to-DC conversion circuit, a determination circuit, and a switch control circuit. The at least two filter-rectification circuits correspondingly convert the at least two input power sources into at least two rectified voltages. The switching switch switches one of the at least two rectified voltages. The determination circuit receives at least two power information, and determines at least two power supply status of the at least two input power sources according to the at least two power information to generate a determination signal. The switch control circuit receives the determination signal to generate a switch control signal to control the switching switch so as to switch one of the at least two rectification voltages.

Systems are provided for integrating AC-to-DC onboard chargers into dual motor inverter systems. In one example, a system may include a first motor inverter system having a first electric a first motor inverter system having a first electric motor circuitry and a first inverter system controller (ISC) circuitry and a second motor inverter system having a second electric motor circuitry and a second ISC circuitry. The system may also include a first onboard charger circuitry electrically connected to the first electric motor circuitry and electrically connected to the first ISC circuitry, and a second onboard charger circuitry electrically connected to the first ISC circuitry. The first onboard charger circuitry, the first ISC circuitry, and the second onboard charger circuitry may form a bi-directional power factor correction circuit.

A power supply includes a noise suppression circuit, an active power factor correction circuit, an active clamp flyback conversion circuit, a voltage-stabilizing feedback compensation circuit, and a control circuit. The active power factor correction circuit and the active clamp flyback conversion circuit convert an AC voltage into an output voltage for driving a load. The voltage-stabilizing feedback compensation circuit performs voltage-stabilizing feedback compensation to the output voltage. The active clamp flyback conversion circuit switches its operational mode based on the instantaneous output loading of the power supply. The control circuit controls the operation of the voltage-stabilizing feedback compensation circuit based on the operational mode of the active clamp flyback conversion circuit, thereby adjusting the equivalent capacitance of the voltage-stabilizing feedback compensation circuit for providing a corresponding voltage-stabilizing feedback compensation range associated with the instantaneous output loading of the power supply.

A bridgeless power factor correction (PFC) circuit for reducing electromagnetic interference (EMI) is disclosed herein. A current source is placed in parallel with a switch of a low frequency leg. The current source may be turned on during zero crossings of the AC input voltage to limit current and reduce the rate of change in voltage. In turn, EMI may be advantageously reduced without the need for large passive filters or complicated circuitry.

A power converter with reduced power consumption receives an input voltage and provides an output voltage to supply power to a load. The power converter includes a power factor correction circuit, a driver circuit, and a controller. The power factor correction circuit includes at least one inductor and an output capacitor. When the controller determines that an effective value of an input current is correspondingly lower than a current lower limit, a specific time period starts based on the output voltage reaching a voltage lower limit, and the specific time period ends based on the output voltage reaching a voltage upper limit. In the specific time period, the controller enables the driver circuit based on the input current being correspondingly greater than a predetermined threshold so as to continuously transfer the energy stored in the at least one inductor to the output capacitor.

The utility model provides a power supply circuit and electronic equipment. The power supply circuit comprises a power factor correction circuit, a power conversion circuit and a detection circuit, and the power conversion circuit is connected with the power factor correction circuit and used for performing power conversion and generating a first control signal; the detection circuit is connected with the power factor correction circuit and the power conversion circuit and used for controlling the power factor correction circuit to work based on the first control signal when the output power of the power conversion circuit is larger than a threshold value. According to the power supply circuit, the size of the power supply circuit can be reduced.

The invention relates to the technical field of electronics, and discloses a power factor correction circuit and a control method and device thereof, and a storage medium, and the circuit comprises a three-phase input voltage sampling unit which is connected with a three-phase power supply end and is used for collecting and outputting a three-phase input voltage; the three-phase full-bridge rectification unit is connected with a three-phase power supply end and is used for receiving a control signal and adjusting current based on the control signal; the energy storage unit is connected with the three-phase full-bridge rectification unit; the current sampling unit is connected with the energy storage unit and is used for collecting and outputting real-time current; the bus voltage sampling unit is connected with the energy storage unit and is used for collecting and outputting real-time bus voltage; the control unit is used for receiving the three-phase input voltage, the real-time current and the real-time bus voltage and sending a control signal to the three-phase full-bridge rectification unit so as to adjust the power factor through the energy storage unit. The problems that in the prior art, a step-down PFC relates to multiple devices, a circuit is complex, and cost reduction is not facilitated are solved.

The invention provides a power factor correction circuit, a control method thereof, an identification method and a storage medium, the power factor correction circuit comprises an inductor module, a power regulation module and a switch module, the inductor module comprises a plurality of inductors connected in sequence, the power regulation module is connected to the inductor module, and the switch module comprises a plurality of switch devices. The switching devices are in one-to-one correspondence with the inductors and are connected to the two ends of the corresponding inductors. According to the embodiment of the invention, the inductor module is provided with the plurality of inductors, and the two ends of the plurality of inductors are connected with the switching devices, so that the inductor module can select a proper target access inductance value according to the operation parameters of the current load, and then select a proper target switching device based on the target access inductance value. Therefore, the total access inductance value of the inductance module can be reasonably adjusted, the current fluctuation during PFC mode switching is reduced, and the stability of the system is improved; and moreover, the loss caused by overlarge access inductance can be reduced, and the efficiency of the system is improved.

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.

The invention discloses a circuit topology design method for a single-stage AC-DC converter, and relates to the technical field of power supply systems, and a totem-pole bridgeless Boost power factor correction circuit and an LCC half-bridge resonant converter with current-doubling synchronous rectification are integrated together through a switching tube sharing technology. Wherein the totem pole bridgeless Boost power factor correction PFC circuit comprises vin, Lf, Cb, two diodes D1 and D2, and two MOS switch tubes S1 and S2; the front stage of the LCC half-bridge resonant converter comprises two MOS switch tubes S1 and S2, a series resonant capacitor Cr, a parallel resonant capacitor Cp and a series resonant inductor Ls. The single-stage AC-DC converter circuit topology provided by the invention has the advantages that the preceding stage only needs one set of controller, the control logic is simple, the number of used electronic components is small, the cost is low, the efficiency is high and the reliability is high; and the backward stage is provided with the current-doubling synchronous rectification circuit, so that the single-stage AC-DC converter circuit topology has the advantages of being high in efficiency, small in loss and suitable for a large-current output occasion.

The embodiment of the invention provides a control circuit and a power factor correction circuit thereof. The control circuit comprises a control signal generation module for generating a switching tube control signal; the comparison module is used for generating a protection trigger signal when the received sampling signal exceeds a preset first threshold value; the leading edge blanking module is used for shielding the protection trigger signal appearing in the preset shielding time; and the overcurrent protection module is used for outputting a first overcurrent protection signal and a second overcurrent protection signal to turn off the first switching tube. The over-current protection module calculates the period number of switching periods in which abnormal states occur continuously; when the period number reaches a preset second threshold value, continuously outputting a second overcurrent protection signal; and when the duration of the second over-current protection signal reaches a preset third threshold value, stopping generating the second over-current protection signal, and resetting the accumulated period number. On the premise of not sacrificing a design margin, reliable protection of the converter can be realized, and the realization cost is reduced.

A motor power source regulation circuit, a control method and an electronic device are provided. The motor power source regulation circuit includes a power factor correction circuit, an isolation circuit, a first power source conversion circuit, a second power source conversion circuit and a control circuit. The isolation circuit includes a first switch sub-circuit and an isolation transformer. The power factor correction circuit regulates an AC input signal to a first DC signal. The first switch sub-circuit converts the first DC signal to a first AC signal. The isolation transformer converts the first AC signal to two or more second AC signals. The first power source conversion circuit converts the second AC signal to a DC drive signal and outputs it to a DC motor. The second power source conversion circuit converts the second AC signal to an AC drive signal and outputs it to an AC motor.

The invention relates to the technical field of electronic power transmission, and provides a power conversion circuit and a power supply system, and the power conversion circuit comprises a transformer which comprises a primary coil and a secondary coil; the primary side interface is used for accessing excitation current; the transformer is configured in the mode that when excitation current is connected to the primary side coil, the secondary side coil generates initial induction current; the secondary side interface is used for outputting induced current; the control unit is connected with the primary coil and the primary interface; the control unit is configured to control the primary side coil to access the excitation current from the primary side interface based on the first control signal; the output unit is connected with a secondary interface of the secondary coil; the output unit is configured to output induced current to the secondary side interface according to the initial induced current, and the induced current is continuous current; the embodiment of the invention is used for reducing the ripple of the output current of the power factor correction circuit (PFC).

A power conversion device includes a power factor correction circuit includes: a power semiconductor having a heat radiation surface facing a first principal surface of a cooling plate, fixed to the first principal surface so as to exchange heat with the cooling plate, and electrically connected to a drive board; an electrolytic capacitor disposed on an opposite side of the power semiconductor from the cooling plate and a same side of the power semiconductor as the drive board, and electrically connected to the drive board; and a resin mold that is fixed to the first principal surface of the cooling plate, defines a position of the power semiconductor, and is interposed at least between the power semiconductor and the electrolytic capacitor. A second principal surface of the cooling plate is thermally connected to a housing when the power factor correction circuit module is fixed to the housing.

A bridgeless PFC circuit includes: a control module that collects a current flowing through a current sampling element; and when the current flowing through the current sampling element is greater than a first threshold, the control module controls a switch element to be turned on. Based on the current flowing through the current sampling element, the switch element can be controlled to be turned on, thereby implementing zero-voltage turn-on of the switch element. Because the collected current does not change abruptly, a delay requirement on a sampling control circuit included in the control module is lowered, and a signal anti-interference capability of the control module is strong.

The embodiment of the invention discloses a power factor correction circuit and equipment thereof, and the circuit comprises a bias voltage module which is configured to be used for generating a preset bias voltage, and generating a positive half-cycle reference voltage and a negative half-cycle reference voltage based on the preset bias voltage; the operation module is configured to be used for receiving the alternating-current voltage signal and outputting a difference signal according to the alternating-current voltage signal and a preset bias voltage; and the comparison module is configured to compare the difference signal with the positive half-cycle reference voltage and the negative half-cycle reference voltage respectively and generate an indication signal indicating the polarity and the amplitude of the AC voltage signal. According to the embodiment of the invention, the detection of the polarity and amplitude of the AC voltage signal is realized by comparing the difference signal with the selected positive and negative half-cycle reference voltages, the use of a negative voltage comparator is avoided, the circuit structure is simplified, the cost is reduced, and the detection precision and reliability are improved.

The utility model provides a voltage output circuit and charging equipment. The voltage output circuit comprises a first conversion circuit, a second conversion circuit and a control circuit, wherein the first conversion circuit comprises a power factor correction circuit; the second conversion circuit comprises a transformer and an output sub-circuit, a primary winding of the transformer is connected with the power factor correction circuit, a secondary winding of the transformer is connected with the output sub-circuit, and the output sub-circuit is used for being connected with a load; the control circuit is connected with the power factor correction circuit and the second conversion circuit, and is used for obtaining a feedback signal based on a second output signal of the secondary winding and a third output signal of the output sub-circuit, and adjusting the work of the power factor correction circuit based on the feedback signal and a first output signal of the power factor correction circuit. Therefore, the first output signal is matched with the feedback signal. According to the voltage output circuit provided by the invention, the conversion efficiency of the voltage output circuit can be improved, and the electromagnetic compatibility of the voltage output circuit is improved.

The invention discloses a vehicle-mounted charging and discharging circuit and method, and relates to the technical field of power supplies, and the circuit comprises a controller, a first switching module, a second switching module, a multi-stage filter circuit, and a power factor correction circuit. The controller controls the first switching module to switch a first connection mode between the multi-stage filter circuit and the external device based on the current external device, and controls the second switching module to switch a second connection mode between the multi-stage filter circuit and the power factor correction circuit. The multi-stage filter circuit is matched with the power factor correction circuit to be switched to a corresponding working mode to work, so that alternating current of a specific type is efficiently transmitted, and the multi-stage filter circuit is compatible with a charging function and a reverse discharging function through any one of single-phase alternating current, two-phase alternating current and three-phase alternating current. And different power grid structures adopted by customers in different regions can be coped with, meanwhile, the electricity utilization safety is ensured, and dangerous accidents caused by excessive electric energy stored in the circuit are avoided.

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.

The invention discloses a power module for a vehicle-mounted charger, the vehicle-mounted charger and a vehicle, and belongs to the technical field of vehicle-mounted chargers. According to the power module of the vehicle-mounted charger, the vehicle-mounted charger comprises a power factor correction circuit, a resonant conversion circuit and a direct current conversion circuit, and the power module is integrated with a first power switch unit, a second power switch unit and a third power switch unit; wherein the first power switch unit is used for constructing a power factor correction circuit, the second power switch unit is used for constructing a resonant conversion circuit, and the third power switch unit is used for constructing a direct current conversion circuit. The power switches of all circuit parts in the vehicle-mounted charger are integrated together to form the power module, and other elements are connected with the power module to form all functional circuits, so that the space occupied by the independent part of each device is reduced, and the integration level is improved.

An electrified vehicle includes a motor including windings, a power factor correction circuit including AC and DC terminals and including legs corresponding to respective AC terminals and connected between the DC terminals, and a DC / DC converter including a first switching circuit including first, second, and third primary legs connected between terminals of a battery, a second switching circuit including at least one secondary leg connected between the DC terminals, and a transformer connected between the first and second switching circuits. In a battery discharging mode, the DC / DC converter switches the first primary leg and the at least one secondary leg, outputting a voltage of the battery to the DC terminals via the transformer. When the motor may be driven, the DC / DC converter switches the second and third primary legs electrically disconnected from the transformer, outputting the voltage of the battery to the motor.