142 results about "Power factor correction circuits" patented technology

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.

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 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.

Provided is a coil structure including an inductor coil having a self-bonding wire structure and including a central hole, a detection coil electromagnetically coupled to the inductor coil, a support unit surrounding at least a portion of an outer periphery of the inductor coil, and a housing including an upper magnetic body and a lower magnetic body facing each other in a vertical direction with the inductor coil therebetween to form an inner space in which the inductor coil and the detection coil are provided, the upper magnetic body and the lower magnetic body each including a protrusion inserted into the central hole of the inductor coil.

This invention provides a power factor correction circuit and a switching power supply. The power factor correction circuit includes: first and second power frequency rectifier circuits, a first high-frequency rectifier circuit, and a bus capacitor; a boost inductor, with its first end connected to the midpoint of the bridge arm of the first power frequency rectifier circuit and its second end connected to the midpoint of the bridge arm of the first high-frequency rectifier circuit; a lightning strike detection unit, including: a first inductor, a detection winding, and a detection device; one end of the primary winding of the first inductor is connected to the first terminal of the AC input grid, and the other end is connected to the midpoint of the bridge arm of the first power frequency rectifier circuit; one end of the secondary winding of the first inductor is connected to the second terminal of the AC input grid, and the other end is connected to the midpoint of the bridge arm of the second power frequency rectifier circuit; the detection device generates a surge protection signal when the voltage across the detection winding exceeds a set value; and a controller, upon receiving the surge protection signal, controls the switching transistor in the second power frequency rectifier circuit to turn off for a fixed time. This invention improves the reliability of the switching power supply.

The objective is to provide a switching power supply equipped with an AC / DC converter having an AC filter circuit and a PFC circuit, which prevents a decrease in power factor even under light load conditions. [Solution] The problem is solved by a switching power supply device comprising an AC / DC converter having a PFC circuit and a pulse signal generation unit that generates pulse signals for driving the switch elements of the PFC circuit so that the voltage of the AC / DC converter becomes a predetermined target value, wherein the AC / DC converter further comprises an AC filter and a current sensor that monitors the current of the AC power supply in order to generate the drive pulse signals for the switch elements, and the current sensor is disposed on the AC power supply side of the AC filter.

The present application provides a power supply device compatible with AC / DC input and a control method thereof, the device comprising a power factor correction circuit, a direct current-to-direct current (DC / DC) circuit, a bypass circuit, an input sampling circuit, and a controller. The power factor correction circuit is connected to the DC / DC circuit. The bypass circuit is connected to a boost circuit input end of the power factor correction circuit and an input end of the DC / DC circuit. The controller is connected to the input sampling circuit and the power factor correction circuit respectively, for controlling the power factor correction circuit to stabilize the output voltage within a preset range according to an input signal collected by the input sampling circuit, or turning off the power factor correction circuit and providing power for the DC / DC circuit via the bypass circuit.

The application discloses a totem pole power factor correction circuit, a control method, a device and equipment, the circuit includes a rectifier module, a reactor, a capacitor module, a control module and a switching module, the input end of the rectifier module is connected with an alternating current power supply, and the output end of the rectifier module is used for being connected with a load; the capacitor module is connected with the output end, and includes a first capacitor and a second capacitor in series connection, and the first connection point of the first capacitor and the second capacitor is connected with the alternating current power supply through the switching module; by setting the control module, the rectifier module and the switching module can be controlled according to load parameters, so that the totem pole power factor correction circuit is switched to a synchronous rectification mode or a non-controlled rectification mode, so that the totem pole power factor correction circuit can reduce loss and save resources under the condition that load parameters change, and the circuit efficiency is ensured. The application can be widely applied in the technical field of control.

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.

In one aspect, a bidirectional bridgeless power factor correction (PFC) circuit includes a main circuit, a current detection circuit, and a controller. The main circuit includes an input inductor and is configured to receive an alternating current (AC) voltage from an AC power supply at a first terminal of the input inductor and convert the AC voltage to a direct current (DC) voltage, where a direction of a current flowing through the input inductor during a positive half of the AC voltage is different from a direction of the current flowing through the input inductor during a negative half of the AC voltage. The current detection circuit is configured to generate a detection signal indicating an amount of the current flowing through the input inductor only during a discharge phase of the input inductor. The controller is configured to generate a zero-crossing signal based on the detection signal.

A power factor correction circuit includes a series circuit in which a reactor L and a control switch Q1 are connected in series to both ends of a rectifier circuit 2 that rectifies input voltage of an AC power supply, a series circuit in which a synchronous rectification switch Q2 and an output capacitor C1 are connected to two main terminals of the control switch, and a control circuit 10 that alternately turns on and off the control switch and the synchronous rectification switch so that output voltage of the output capacitor becomes a first predetermined value and controls ON time of the control switch so that a peak value of current flowing through the control switch is proportional to input voltage. The control circuit turns on and off the control switch and the synchronous rectification switch so as to adjust a reverse excitation amount for reverse excitation of the reactor by causing current flowing through the reactor to reversely flow from the output voltage side to the input voltage side, and the reverse excitation amount is adjusted to a second predetermined value regardless of input voltage Vi.

The utility model discloses a three-phase interlaced PFC control system which comprises a three-phase filter circuit, a three-phase rectifier circuit, a three-phase interlaced power factor correction circuit, a three-phase AC input current detection circuit and a microcontroller. The input end of the three-interlaced power factor correction circuit is connected with the output end of the three-phase rectification circuit, and the output end is connected with a load; the input end of the three-phase AC input current detection circuit is connected with the three-phase power, and the output end of the three-phase AC input current detection circuit is connected with the microcontroller; the microcontroller collects an output end signal of the three-phase rectification circuit, an output end signal of the three-interlaced power factor correction circuit and an output end signal of the three-phase AC input current detection circuit, and drives the three-interlaced power factor correction circuit. According to the utility model, the problems of overhigh instantaneous voltage and current stress of a single-path PFC are solved, and the unbalance degree of three-phase current is obtained by adding the three-phase AC input current detection circuit, so that the driving mode of the three-path PFC unit circuit is adjusted, and the safety and stability of the system are ensured.

A dual-input power supply has two power paths that connect a server in a data center to electrical power. Each power path has a first stage that comprises a power-factor correction circuit. The power paths share a common second stage that comprises a dc / dc converter. The first stages of the power paths collectively define a pair of first stages that is disposed either within a package that is off the motherboard or without a package and on the motherboard. Similarly, the second stage is disposed either within a package that is off the motherboard or without a package and on the motherboard.

A power module, a totem-pole power factor correction circuit, and a control circuit thereof. In response to a case in which a phase value of a transient voltage of an input voltage of the totem-pole power factor correction circuit is within a predetermined phase range, and an absolute value of a voltage value is less than a predetermined voltage value, the control circuit controls a main power switch in the totem-pole power factor correction circuit to be turned on and off, and controls an auxiliary power switch to remain off.

This invention discloses an adaptive AC / CDC power supply control method and system based on neural networks, belonging to the field of power supply control technology. By deeply integrating neural network technology with wide voltage impedance matching control and overall dynamic control of the AC / CDC power supply, it divides voltage characteristic intervals and constructs nonlinear correlation models of input impedance, grid voltage, and output power within each interval using neural networks. This achieves adaptive impedance matching by dynamically generating impedance matching control parameters based on real-time operating conditions within each interval. A smooth switching mapping relationship of control parameters between adjacent voltage characteristic intervals is established, enabling seamless adjustment of control parameters when the input voltage switches between intervals. Using a power factor correction circuit as the core regulating component, its parameters are dynamically adjusted via neural networks to achieve real-time and accurate matching of input impedance with the grid side. Combined with output closed-loop regulation, this meets the output requirements of electrical equipment, completing the overall adaptive control of the AC / CDC power supply.

The display device, the circuit board, and the power supply circuit are provided.The power supply circuit comprises a rectification filter circuit, a power factor correction circuit, an isolation voltage conversion circuit, and a waveform generation circuit.The power factor correction circuit is connected with the rectification filter circuit, the isolation voltage conversion circuit, and the waveform generation circuit respectively.The waveform generation circuit is arranged to continuously change the waveform of the voltage signal output by the power factor correction circuit, thereby changing the working frequency of the isolation voltage conversion circuit and reducing the electromagnetic interference in the power supply circuit.

The Buck power factor correction circuit comprises an H-bridge circuit, an inductor, a capacitor and a controller, the midpoint of a first bridge arm of the H-bridge circuit is used for being connected with the positive electrode of an alternating current source, and the midpoint of a second bridge arm of the H-bridge circuit is used for being connected with the negative electrode of the alternating current source; the first end of the inductor is connected with the first end of the first bridge arm and the first end of the second bridge arm; the first end of the capacitor is connected with the second end of the inductor; the second end of the capacitor is connected with the second end of the first bridge arm and the second end of the second bridge arm; the controller is used for controlling the H-bridge circuit to rectify when the absolute value of the voltage of the alternating current source is larger than the voltage of the capacitor, and controlling the H-bridge circuit to stop rectifying when the absolute value of the voltage of the alternating current source is smaller than or equal to the voltage of the capacitor. The scheme provided by the embodiment of the invention is not simple two-stage circuit series connection, the circuit integration degree is high, and the electric energy conversion efficiency is improved.

This application relates to the technical field of converting AC power input to DC power output, specifically providing a totem-pole power factor correction system and its circuit control method, device, data center power supply, as well as compressors and air conditioning equipment. In this application, the input voltage signal of the totem-pole power factor correction circuit is transmitted to a frequency-adaptive phase-locked loop to extract the fundamental phase signal of the grid voltage. Based on the fundamental phase signal, a power frequency transistor drive signal synchronized with the zero-crossing point of the grid voltage is generated to control the power frequency transistor in the totem-pole power factor correction circuit. Based on the input current signal of the totem-pole power factor correction circuit and the fundamental phase signal, current closed-loop control is performed to generate a high-frequency control signal synchronized with the fundamental phase signal to control the high-frequency transistor in the totem-pole power factor correction circuit. This application can improve the efficiency and control stability of the totem-pole power factor correction circuit.

The invention relates to the technical field of radio-frequency power supply control, in particular to a radio-frequency power supply charging and discharging power control system, which comprises a power factor correction circuit used for converting commercial power into a working power supply used for supplying energy, and the working power supply is stable and pure high-voltage direct current; the radio frequency signal control module comprises an information monitoring unit, a load impedance prediction unit and a radio frequency signal control unit; the information monitoring unit is used for detecting working information of a load end in real time; the load impedance prediction unit is used for predicting the predicted load impedance at the next moment according to the working information; according to the invention, by calculating the mutual influence between the internal temperature and pressure of the reaction chamber and the power of the radio frequency power supply, compared with the common independent influence of the internal temperature and pressure of the reaction chamber and the power of the radio frequency power supply on the load impedance, the prediction precision of the future load impedance change can be effectively improved; therefore, the working power supply can be adjusted in the later period, and mismatch is avoided.

The present disclosure provides a variable frequency drive with active power factor correction circuit topology to facilitate unity power factor and non-positive DC bias on the output voltage. The topology is an improvement over the traditional boost power factor correction circuit consisting of a bridge rectifier, a plurality of inductors, a plurality of power semiconductor transistor switches, a plurality of boost diodes, a bus capacitor bank and a controller. In certain embodiments, the active power factor correction circuit feeds an inverter circuit that drives a motor.

Some embodiments of the present application provide a display apparatus, a power factor correction (PFC) circuit, and a power supply control method. The display apparatus comprises the PFC circuit. The PFC circuit may comprise a PFC processor; and a power stage circuit, comprising a first inductor and a power switching transistor; wherein the PFC processor is configured to: output a first enable signal based on a comparison result between an inductor current of the first inductor and a preset current upper limit value; in response to the first enable signal being valid, allow the power switching transistor to be turned on; and in response to the first enable signal being invalid, not allow the power switching transistor to be turned on.

An inductor, a power factor correction circuit, and a power supply system. The inductor includes a coil winding and a magnetic core. The magnetic core includes a first outer magnetic core, a second outer magnetic core, and a winding unit. The first outer magnetic core and the second outer magnetic core are disposed opposite to each other in a first direction, the winding unit is disposed between the first outer magnetic core and the second outer magnetic core, and the coil winding is disposed around the winding unit. The winding unit includes a magnetic core middle column and at least two air-gaps distributed in the first direction. The inductor can improve the operating efficiency of the power factor correction circuit and can optimize efficiency of the power supply system in the light load phase.

The invention discloses an overcurrent protection method, an overcurrent protection circuit, a power supply circuit and an air conditioner outdoor unit, and belongs to the technical field of power electronics. The overcurrent protection method comprises the following steps: acquiring an instantaneous current value of the power factor correction circuit; periodically determining a corresponding first overcurrent protection threshold value according to the instantaneous current value, wherein the first overcurrent protection threshold value is greater than the instantaneous current value of the corresponding period; and executing an overcurrent protection strategy on the power factor correction circuit according to the first overcurrent protection threshold. The corresponding overcurrent protection threshold value is generated on the basis of the actual current of the circuit, so that the current accessed to the outdoor unit of the air conditioner has different overcurrent protection threshold values at different current phases, thereby reducing the difference of overcurrent trigger intervals at different phases, improving the reliability of overcurrent protection, and improving the reliability of overcurrent protection. And the equipment safety of the air conditioner outdoor unit is protected.

When a secondary battery is charged, a switch is closed, and a first boost chopper circuit, a second boost chopper circuit, and a totem-pole bridgeless power factor correction circuit, which are coupled in parallel to each other, are driven to operate in an interleaving manner, and in this state, an alternating-current voltage inputted from an AC input terminal is converted into a direct current, and the direct current is outputted from a direct current output terminal. When alternating current is outputted using an AC output terminal, the switch is closed, and the totem-pole bridgeless PFC circuit is used, and in this state, a DC voltage from the secondary battery is converted into an alternating current, and the alternating current is outputted from the AC output terminal.

The invention relates to a charging device (1) comprising at least one grid connection (2) for an alternating voltage (3), a power factor correction circuit (5) for each grid connection (2), n DC / DC converters (6) connected in parallel, wherein n > 2, and a control device (7), wherein the control device (7) is configured to operate the DC / DC converters (6), wherein the control device (7) is further configured to distribute power non-uniformly to the DC / DC converters (6) depending on the power requirements and parameters of the switching elements (S) of the DC / DC converters (6).

The invention discloses a two-stage temperature control protection method and system for a power factor correction circuit, and the method comprises the steps: a main controller collects the working temperature of a power device in real time through a temperature collection module at a fixed period, and carries out the processing, and obtains the current temperature of the power device; judging whether the current temperature of the power device exceeds a first temperature threshold value or not; if not, monitoring is continued, and any protection action is not started; if the current temperature of the power device exceeds the first temperature threshold value, a fan corresponding to the power device is started, and the rotating speed of the fan is adjusted according to the difference value between the current temperature of the power device and the first temperature threshold value; and monitoring the current temperature of the power device when the fan runs, and starting temperature closed-loop control to reduce the power consumption of the power device when the current temperature of the power device rises to exceed a second temperature threshold value. Temperature control protection is triggered through double thresholds, and fan speed regulation and duty ratio regulation of the increment PID controller are combined, so that the power factor correction circuit is protected.

The embodiment of the application provides a power module, a totem column power factor correction circuit and a control circuit thereof. The control circuit controls the main power tube in the totem column power factor correction circuit to turn on and turn off, and controls the auxiliary power tube to keep off, when the phase value of the instantaneous voltage of the input voltage of the totem column power factor correction circuit is in a predetermined phase interval and the absolute value of the voltage value is less than a predetermined voltage value. The embodiment of the application can avoid the situation that the voltage values of the input voltage are low and the voltages on both sides of the auxiliary power tube are not turned on at the same time, reduces the switching loss, and improves the working efficiency of the totem column power factor correction circuit and the power module.

The embodiment of the invention provides a household appliance, which comprises a controller, a rectifying circuit, a first driving circuit, a power factor correction circuit and a power grid voltage sampling circuit, and the sampling end of the power grid voltage sampling circuit is connected between the output end of the rectifying circuit and the input end of the power factor correction circuit. The controller is configured to output a periodic control signal to the driving circuit, and the periodic control signal is used for controlling the first driving circuit to drive the power factor correction circuit to work; a voltage value of the voltage rectified by the rectifying circuit is obtained through sampling of a power grid voltage sampling circuit, and a cycle-by-cycle overcurrent protection threshold value is dynamically determined according to the voltage value of the rectified voltage; and when the flowing current of the power tube in the power factor correction circuit is greater than the cycle-by-cycle overcurrent protection threshold value, stopping outputting the cycle control signal to the first driving circuit in at least one cycle so as to reduce the flowing current of the power tube. According to the embodiment of the invention, the performance of the power factor correction circuit is improved while the reliability of overcurrent protection is improved.

A control circuit for a bridgeless power factor correction (PFC) circuit, a control method therefor, and a power supply system are provided. The control circuit includes a polarity determination module and a logic control module. The polarity determination module is configured to receive a sampling signal of an AC input voltage of the bridgeless PFC circuit. The polarity determination module is also configured to output a first digital signal when the sampling signal is a positive voltage signal, and output a second digital signal when the sampling signal is a negative voltage signal. The logic control module is configured to output a first driving signal to the bridgeless PFC circuit, when receiving the first digital signal and the preset pulse signal having a first level, and output a second driving signal to the bridgeless PFC circuit, when receiving the second digital signal and the preset pulse signal having a second level.

The application discloses a control circuit and a control method of a power factor correction circuit, and relates to the field of power converters.The control circuit comprises a current reference signal generating circuit, a current sampling circuit, a first subtractor, a first calculation unit, a current loop and a control signal generating circuit.The current reference signal generating circuit generates a current reference signal, the current sampling circuit outputs a current sampling signal, the first subtractor generates a first error signal according to the current sampling signal and the current reference signal, the first calculation unit generates a first parameter and a second parameter according to the current reference signal, the current loop generates a current loop control signal according to the first error signal, the first parameter and the second parameter, and the control signal generating circuit generates a driving control signal according to the current loop control signal.The gradual control of the first parameter and the second parameter of the control circuit can overcome the contradiction between ITHD and input current peak oscillation, improve ITHD and avoid the problem of peak oscillation.