267 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.

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 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 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.

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.

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.

To provide a controller in which total harmonic distortion (THD) can be improved.SOLUTION: A controller (700) includes: a first external terminal receiving a first voltage (Vmult) with a full-wave rectified waveform; a second external terminal receiving a first detection voltage (Vis), as a negative voltage, generated by a current flowing through a sense resistor (Ris) connected to a ground potential application terminal; an error amplifier circuit (710) generating a second voltage (V2) by amplifying an error between a second detection voltage (Vs) corresponding to an output voltage (Vdc) and a reference voltage (Vref1); an arithmetic circuit (733) generating a third voltage (V4) by multiplying the first and second voltages; an inverting amplifier (734) generating a fourth voltage (V5) by inverting and amplifying the first detection voltage; and a comparator (735) comparing the third voltage and the fourth voltage.SELECTED DRAWING: Figure 11

The invention relates to an operation mode control technique for a power factor correction circuit. A power factor correction (PFC) control circuit includes a pulse width modulation (PWM) circuit configured to control a switch that switches a power converter. The PFC control circuit also 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 controlling a start of a switching cycle of the switching power converter based on the selected conduction mode. Further, 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.

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.

A switching power supply architecture comprises a power factor correction circuit adjusting an output for a post-stage circuit based on an output of the overall architecture; a resonant conversion circuit comparing its own output voltage with a comparison voltage value; and a wide input range step-down circuit disposed in sequence. When the comparison voltage value is greater than its own output voltage, an operating frequency of the resonant conversion circuit is the same as a resonant frequency. When the comparison voltage value is less than its own output voltage, an operating frequency of the resonant conversion circuit is greater than the resonant frequency, and the resonant conversion circuit is driven in a burst mode. Heat generated by operation of the switching power supply architecture is not concentrated in the power factor correction circuit and the resonant conversion circuit, but is dispersed and generated in associated circuits.

An electronic apparatus may include a power factor correction (PFC) circuit and a control circuit for controlling the operation of the PFC circuit, wherein the PFC circuit may include one or more of: an inductor connected to one end of an input voltage unit; a switch unit comprising a first switch connected in series to the inductor, and a second switch connected in series to the first switch; a flying capacitor unit comprising a first diode and a flying capacitor connected in series to each other and connected in parallel to the first switch; and an output unit comprising a second diode and an output capacitor connected in series to each other and connected in parallel to the flying capacitor and the second switch, and the control circuit comprises a first control circuit which obtains an on-off control signal for the first switch on the basis of the output voltage of the output capacitor and transmits the signal to the first switch, and a second control circuit which obtains an on-off control signal for the second switch on the basis of the flying voltage of the flying capacitor and transmits the signal to the second switch.

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 application relates to the technical field of switching power supply, and discloses a bridge type low-stress passive soft switching boost power factor correction circuit, which comprises a direct current input power supply, a main power switching tube, an output filter capacitor and a coupling inductor comprising a primary side and a secondary side; a passive soft switching buffer network is connected to a main circuit of the circuit, the network comprises a diode full-bridge structure and a buffer capacitor, and the leakage inductance of the secondary side of the coupling inductor is connected between the midpoints of two bridge arms of the full-bridge structure; the application utilizes the ratio difference of the coupling inductor to generate a forward potential difference, drives the buffer capacitor to reversely charge to establish a negative voltage, and further provides a discharge circuit for the parasitic junction capacitance of the main power switching tube, so that zero voltage turn-on is realized, and high-frequency switching loss is reduced; meanwhile, the highest voltage stress of the semiconductor device is clamped in the range of the direct current output voltage through the potential restriction of the full-bridge network. The application does not need auxiliary active devices, and improves conversion efficiency and reliability while simplifying the system structure.

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.

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.

A control circuit for a circuit that has a rectifier circuit including first to fourth diodes, and first to fourth switches respectively connected in parallel with the first to fourth diodes, for rectifying an AC voltage; and a capacitor receiving the rectified AC voltage. The control circuit controls the first to fourth switches, and includes: a determination unit determining an off-period in which, when the AC voltage is applied, the first to fourth diodes turn off, the off-period including a first period and a second period, in which the first and fourth diodes, and the second and third diodes, respectively turn off; and a control unit turning on the first and fourth switches in the first period, when the second and third diodes are off, and turning on the second and third switches in the second period, when the first and fourth diodes are off.

The present disclosure provides a control device for a power factor correction circuit. The power factor correction circuit is disposed in a power supply device configured to generate a direct current output voltage from an alternating current voltage applied to a pair of power supply terminals. The power factor correction circuit is disposed between a full-wave rectifier circuit configured to generate a full-wave rectified voltage by full-wave rectifying the AC voltage and an output wiring configured to apply the output voltage. The power factor correction circuit includes an inductor inserted between the full-wave rectifier circuit and the output wiring, and a switching element configured to switch between an on state and an off state to control a current flowing through the inductor.

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.

1. The name of the design product: air-cooled power supply printed circuit board (60kw). 2. The use of the design product: component 1 is a direct current circuit board, component 2 is a power factor correction circuit board, both of which are used as printed circuit boards of air-cooled power supply modules. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: combined state diagram 1.

The utility model provides an integrated electrical system and a vehicle, and belongs to the technical field of vehicles, the integrated electrical system comprises a driving motor, a motor controller, a switch module and a control module; the driving motor comprises first, second and third windings; the control module acquires current information of the charging terminal, and controls the integrated electrical system to work in a first or second working mode based on the current information; in the first working mode, the switch module is switched off; and in the second working mode, the switch module is switched on, and the driving motor, the motor controller and the switch module form a power factor correction circuit. Charging and driving are achieved based on a set of integrated electrical system so as to reduce the manufacturing cost and the size, secondly, in the charging mode and the driving mode, the driving motor and the motor controller are both in the working state, and the driving motor, the motor controller and the switch module can form a PFC circuit in the second working mode so as to correct the power factor. The utilization rate is improved, and the problem of resource waste is avoided.

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.