416 results about "Power factor correction circuits" patented technology

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.

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 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.

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.

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 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 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.

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.

The present description concerns a circuit for converting from a first alternating voltage to a second voltage. The circuit includes: a first thyristor; a first control circuit of the first thyristor; a power factor correction circuit comprising a coil; and a first circuit configured to convert a third voltage into a fourth DC voltage. The third voltage corresponds to a difference between a potential at a first node connected to an output node of the coil and a reference potential. The fourth DC voltage is configured to supply the first control circuit of the first thyristor, and is referenced with respect to the same reference potential as the third voltage.

The invention discloses a circuit, charging equipment and a control method of the circuit, relates to the technical field of charging equipment, and aims to reduce pre-charging resistance in the charging equipment and reduce cost and power consumption. The circuit comprises an energy storage part and a switch sub-circuit, the energy storage part is electrically connected with the switch sub-circuit; the switch sub-circuit is electrically connected with the power factor correction circuit and / or the direct current conversion circuit; the switch sub-circuit is configured to pre-charge the power factor correction circuit or the DC conversion circuit by using the electric energy stored in the energy storage part; or the electric energy discharged by the power factor correction circuit or the direct current conversion circuit is stored in the energy storage part.

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.

The invention provides a power factor correction circuit, a chip, voltage management equipment and a power system. The power factor correction circuit comprises an amplification module, an isolation module and a phase synchronization module, the amplification module is used for converting the sampling current signal into sampling voltage; the isolation module receives the sampling voltage and outputs the sampling voltage in an electrical isolation manner, and receives the switch control signal and outputs the switch control signal in an electrical isolation manner; the phase synchronization module regulates and controls the current phase of the input power supply to follow the voltage phase based on the level state of the switch control signal so as to output an output power supply. By arranging the isolation module, the analog part and the digital part of the power factor correction circuit are separated, physical and electrical isolation is ensured, and then analog signals and digital signals in the power factor correction circuit are prevented from being mixed; once the power factor correction circuit breaks down, the circuit may be damaged, and even electric shock of people may be caused.

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.

The invention discloses a conversion control circuit and method for changing the output voltage of a power factor correction circuit. The conversion control circuit is used for controlling the resonant power converter and is used for changing the first output voltage generated by the power factor correction circuit. The resonant power converter generates a second output voltage according to the first output voltage. The conversion control circuit includes: a first transconductance circuit generating a first signal according to a proportional output voltage related to a second output voltage; the second transconductance circuit generates a second signal according to an input related signal, and the input related signal is related to the peak value of the input voltage of the power factor correction circuit; the current control circuit generates a third signal according to the first signal and the second signal. The third signal is used for changing the first output voltage, so that when the second output voltage drops, the first output voltage drops, and when the input voltage drops, the first output voltage drops.

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.

The embodiment of the invention provides a power factor correction circuit. The power factor correction circuit includes a converter, a sampling circuit that forms a voltage sampling signal, a converter control circuit, a first power supply circuit that draws electric energy from an AC input, a second power supply circuit that draws electric energy through an auxiliary winding, and a power supply control circuit. The power supply control circuit uses the first power supply circuit or the second power supply circuit to supply power to the converter control circuit according to the power supply voltage. The converter control circuit controls the converter to operate in a dormant state or a working state according to the voltage sampling signal. The maximum duration of the dormant state is adaptively adjusted according to whether the first power supply circuit is used or not and whether the voltage sampling signal reaches the upper limit voltage or not. By increasing the time constraint of the dormant state and combining the power supply condition of the circuit to adaptively adjust the duration time of the dormant state, the low no-load standby power consumption can be realized under the condition that the post-stage power supply mode is reduced and saved.

The invention relates to a method for optimizing the lifespan of at least one capacitor of a capacitor module (400) of an electronic device (100), the electronic device (100) being suitable for charging a high-voltage battery (600) of an electric vehicle, the device comprising a power-factor-correction circuit (300), a DC / DC converter (500), a cooling device (700) suitable for cooling at least one capacitor of the capacitor module (400), and a second temperature sensor (910) placed on at least one capacitor of the capacitor module (400) and suitable for measuring an actual temperature of the at least one capacitor, the method comprising the following steps: • a first step a1) of activating the charger (100) with a view to charging the high-voltage battery (600), • a second step a2) of charging the high-voltage battery (600) using the charger (100) with a first setpoint power (P1_cons), and • a third step a3) of waiting a first determined time (tp1) during which the first setpoint power (P1_cons) is delivered to the battery (600).