17 results about "Active power factor correction" patented technology

The present application relates to a kind of for single lithium battery exchange light double-input charging control method, device and medium, wherein, by detecting the electrical state of alternating current side and photovoltaic side port to determine the working mode, accordingly control corresponding front-stage power circuit alternating current or mixed working mode enable active power factor correction circuit, photovoltaic mode enable photovoltaic maximum power point tracking boost circuit, the output direct current of both is converged to common high-voltage direct current bus;Control bus and the only fixed-frequency resonant type TAB converter between battery works in fixed resonant frequency state, utilize its built-in high-frequency transformer isolation conversion and battery low-voltage side diode rectification clamping processing after output adaptation electric energy;Through the power regulation of front-stage circuit, realize constant-current or constant-voltage charging closed loop.By three-way port architecture and converter multiplexing design, adaptation double-input extreme scene, efficiently solve single lithium battery exchange light double-input charging problem.

A power supply system comprises a main circuit, a sampling circuit, a driving circuit and a controller, wherein: the power conversion circuit in the main circuit comprises an LLC resonant conversion circuit; the sampling circuit is electrically connected with part of the circuit in the main circuit, and is used for sampling information of input signals, resonant capacitor signals and output signals of the main circuit; the controller is electrically connected with the sampling circuit and the driving circuit, and is used for controlling the driving circuit based on the information sampled by the sampling circuit, so that the driving circuit drives the LLC resonant conversion circuit to realize active power factor correction, electrical isolation and voltage conversion; wherein the control strategy of the controller makes the input voltage of the LLC resonant conversion circuit be pulse direct current voltage or stable direct current voltage, and makes the LLC resonant conversion circuit work in a wide frequency range near the resonant frequency and far away from the resonant frequency. The power supply system reduces the number of power devices used, reduces the cost, reduces the volume, works in a soft switching state in all working conditions, and is conducive to high frequency.

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.

The invention relates to a control circuit and method of an active power factor correction circuit and electrical equipment. The control circuit comprises a detection module used for detecting a bus voltage actual value, a network side voltage actual value and a network side current actual value of the active power factor correction circuit; the carrier frequency processing module is used for determining a carrier frequency initial value according to the bus voltage actual value and the network side voltage actual value, determining a target frequency range according to the network side current actual value and a preset initial frequency range, and determining a target carrier frequency according to the carrier frequency initial value and the target frequency range; the target carrier frequency belongs to the target frequency range; and the control module is connected with a power device in the active power factor correction circuit and is used for generating a modulation signal according to the target carrier frequency and controlling the working state of the power device according to the modulation signal. The control circuit can give consideration to harmonic suppression, loss reduction and temperature rise suppression.

The application discloses a direct current charging device and a control method for a thermal power unit, which comprises a first filter module, an active power factor correction module and a power supply conversion module, wherein the power supply conversion module comprises a plurality of parallelly connected power modules, each of the power modules comprises a power conversion unit, a control loop unit, a redundant control unit, a current sharing control unit and a detection feedback unit, the first filter module is electrically connected with an alternating current power supply and the active power factor correction module respectively, and the active power factor correction module is electrically connected with each power conversion unit; in each power module, the power conversion unit is electrically connected with the control loop unit and the redundant control unit respectively, the redundant control unit is electrically connected with the detection feedback unit and a previous adjacent power module respectively, the current sharing control unit is electrically connected with the control loop unit and the detection feedback unit respectively, and the detection feedback unit is electrically connected with a storage battery. The application improves the power factor and reduces the harmonic pollution of the power grid.

According to the direct-current power supply system and the air conditioner, a control module performs active power factor correction on external mains supply, so that the input current waveform and the voltage waveform of the external mains supply are highly synchronized, and reactive power loss is eliminated. The control module dynamically adjusts the output current of each power supply module through arranging a plurality of layers of control loops to realize current sharing operation, so that overload operation of a single power supply module is avoided, the service life is prolonged, and even if part of power supply modules fail, the remaining power supply modules can still share the direct current load, thereby ensuring continuous power supply of the power system. Multiple paths of first direct current after current sharing are converged into a single direct current bus, a traditional alternating current power supply or distributed direct current power supply scheme is replaced, and copper loss can be reduced to the maximum extent; an independent power supply does not need to be configured for each load, intermediate links such as a transformer and a rectifier are reduced, and hardware cost is reduced; if a new load can be directly connected to the DC bus, the system does not need to be reconstructed.

A power supply includes an active power factor correction circuit, a resonant converting circuit, a zero-current detecting circuit and a control circuit. The control circuit provides a first control signal for operating the active power factor correction circuit, and provides second and third control signals for operating the resonant converting circuit. The zero-current detecting circuit monitors the status of boost inductor current in the active power factor correction circuit. When the boost inductor current is not in a zero-current state, the resonant converting circuit is configured to operate in a single-element resonant mode. When the boost inductor current is in the zero-current state, the resonant converting circuit is configured to operate in a multi-element resonant mode, thereby reducing overall resonation energy and resonation loss.

The present disclosure provides a non-isolated buck Active Power Factor Correction (APFC) circuit (100) including an integrated monolithic Application-Specific Integrated Circuit (ASIC) (110) for controlling and driving the non-isolated buck APFC circuit and a motor controller and driver circuit. The APFC circuit (100) includes a bridge rectifier (102), an Electromagnetic Interference (EMI) filter (104), and a non-isolated buck APFC power converter (106) configured to convert a high voltage DC to a low voltage DC, using one or more switching components, to achieve an active power factor correction. The APFC circuit (100) includes a motor controller and driver circuit (108) configured to generate Pulse Width Modulation (PWM) pulses to drive windings of a motor (M1) for controlling a speed of the motor (M1). The non-isolated buck APFC power converter (106) and the motor controller and driver circuit (108) are configured to share common ground.

The invention relates to the technical field of LED illumination driving, in particular to a novel phase-cut dimming power supply. Comprising an AC input filtering and DC conversion circuit, an active power factor correction circuit, a flyback high-low voltage isolation conversion circuit, a synchronous rectification circuit, a voltage stabilizing circuit, a dimming circuit, a single-chip microcomputer control small board, a PWM signal-to-analog signal circuit, a phase cutting control circuit and an external load. According to the invention, the conduction angle and front and back edge information can be accurately analyzed, the detection precision is obviously improved, the stroboflash during deep dimming is eliminated, the dimming range is widened without flicker, dynamic holding current control data is generated, the light modulator can adapt to holding current requirements of different light modulators, the stable work of the light modulator is ensured, and the power consumption is reduced; besides, a novel PWM signal-to-analog signal circuit is adopted, so that the linearity and the anti-interference capability of signal conversion are greatly improved, stable output is ensured, and a high-compatibility and high-precision phase-cut dimming effect is realized.

The invention relates to the technical field of switching power supplies, and discloses a two-stage active power factor correction circuit and a switching power supply in order to solve the problems of low power factor and high harmonic pollution caused by the fact that the input of the switching power supply is alternating current. The circuit comprises an electromagnetic interference filter, a rectifier bridge, a PFC booster circuit, an LLC half-bridge resonance compensation circuit and a controller which are connected in sequence. The PFC booster circuit is used for boosting the voltage output by the rectifier bridge to the high-voltage direct-current bus voltage; the LLC half-bridge resonance compensation circuit is used for converting the high-voltage direct-current bus voltage output by the PFC booster circuit into stable low-voltage direct current required by a load by adjusting the switching frequency of the LLC half-bridge resonance compensation circuit; the controller is used for controlling the working mode of the PFC booster circuit according to the magnitude of the output current of the LLC half-bridge resonance compensation circuit; meanwhile, the output voltage of the LLC half-bridge resonance compensation circuit is sampled, and the switching frequency of the LLC half-bridge resonance compensation circuit is adjusted according to feedback of the output voltage. By adopting the circuit, the power utilization efficiency of power equipment is improved, and harmonic interference is reduced.

The invention provides an LED drive circuit and a lamp, and relates to the technical field of LEDs. The LED driving circuit comprises a rectification filtering module, an active power factor correction module and a dimming control module which are connected in sequence, the voltage compensation module detects an input voltage and sends a feedback compensation signal to the active power factor correction module according to the input voltage; the load compensation module detects a circuit load and sends a current sampling compensation signal to the active power factor correction module according to the circuit load. The voltage compensation module detects input voltage fluctuation and feeds back compensation to the APFC module, and the load compensation module detects load change and conducts current sampling compensation on the APFC module, so that the requirements of high PF and low THD can still be met when the voltage is high and the load is light.

The invention relates to an alternating-current double-input charging control method and device for a single lithium battery and a medium, and the method comprises the steps: judging a working mode through detecting the electrical states of an alternating-current side port and a photovoltaic side port, and controlling an alternating-current or mixed working mode of a corresponding preceding-stage power circuit to start an active power factor correction circuit according to the working mode; in the photovoltaic mode, a photovoltaic maximum power point tracking booster circuit is started, and the two output direct currents are converged to a shared high-voltage direct-current bus; a unique fixed-frequency resonant TAB converter between a bus and a battery is controlled to work in a fixed resonant frequency state, and adaptive electric energy is output after isolation transformation of a built-in high-frequency transformer and rectification clamping processing of a battery low-voltage side diode; and a constant-current or constant-voltage charging closed loop is realized by adjusting power through a pre-stage circuit. Through a three-port architecture and a converter multiplexing design, a dual-input extreme scene is adapted, and the problem of alternating-light dual-input charging of a single lithium battery is efficiently solved.

Provided are a method for controlling a full bus load to discharge in a household electrical appliance and related apparatuses. In the method, in response to determining that a half bus load is turned on and a full bus load is turned off, a voltage difference between a first DC power and a second DC power is determined to obtain a voltage difference. The first DC power and the second DC power are obtained by converting three-phase power through a three-level active PFC unit. Subsequent to the voltage difference between the first DC power and the second DC power being determined, a full bus load is controlled to be turned on or off based on the voltage difference to stabilize a half bus voltage in a predetermined voltage interval.

The application provides a vehicle-mounted ACDC charging circuit, a charging module and a working method thereof. The charging circuit comprises an input module, an output module and a charging management module; the charging management module is connected between the input module and the output module; the input module inputs commercial power and converts the input voltage to provide an effective voltage for the charging management module and a working load; and the output module inputs the voltage to a charging device. The active power factor correction circuit adopts a three-stage interleaved parallel Boost topology structure, takes an average current as a control strategy, and realizes power factor correction through a double closed loop of current and voltage; meanwhile, a phase-shift full-bridge control circuit is adopted, a clamping capacitor and a freewheeling diode are added to the secondary side of the transformer to reset the main current, so that the power switching device of the main circuit works in a zero-voltage and zero-current state; thereby the power transmission efficiency of the wireless charging system is improved, the harmonic pollution is reduced, the power factor of the grid side is improved, and the quality of the output power is ensured.

The application relates to a wireless charging power supply device and a control method of a wireless charging power supply device. The wireless charging power supply device comprises a filter circuit and a DC / AC inverter. One side of the filter circuit is used for connecting AC power, and the other side is connected with the DC / AC inverter. The control method of the wireless charging power supply device obtains input AC active power, AC power information and inverter parameters of the DC / AC inverter, calculates an inverter parameter change amount of the DC / AC inverter, controls power switches in the DC / AC inverter to be turned on or turned off according to the inverter parameter change amount, and makes the circuit input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to pure resistance. Therefore, the phase of voltage and current in the wireless charging power supply device is the same, and active power factor correction is realized. The control method makes the wireless charging power supply device still realize power factor correction under the condition that an AC / DC adapter is omitted, reduces the power conversion series, and improves the use convenience.

This application discloses an electronic control board, an outdoor air conditioning unit, and an air conditioner, belonging to the field of household appliance technology. The electronic control board is divided into a first installation area, a second installation area, a third installation area, and a fourth installation area, and the main control chip circuit, active power factor correction control circuit, frequency converter control circuit, power input circuit, and functional interface circuit are installed in different installation areas respectively. Due to the partitioned installation and the main control chip circuit being installed on one side of the substrate, i.e., near the edge of the substrate, the passive components are arranged around the control chip or concentrated on one side of the control chip, making it easier to dissipate the heat generated by the control chip, reducing heat interference between the control chip and other components in the installation area, which is beneficial to improving heat dissipation efficiency and enabling the electronic control board to adapt to higher frequency and performance control requirements.

The utility model relates to a dual protection circuit for suppressing surge and overshoot during PFC rapid startup and shutdown. The dual protection circuit comprises a protection unit 1 control circuit, a protection unit 1, a protection unit 2, a protection unit 2 control circuit, an auxiliary power supply circuit, an IC main control module, an APFC circuit, a rectification filter circuit and a load end. An IC main control module; the IC main control module is connected with a signal input end and the APFC circuit; the APFC circuit is respectively connected with the protection unit 1, the protection unit 2 and the IC main control module; the rectification filter circuit is connected with the input port. The protection unit 1 is connected with the protection unit 1 control circuit, the rectification filter circuit and the APFC circuit; the protection unit 2 is connected with the protection unit 2 control circuit, the APFC circuit and the load end; the APFC circuit is an active power factor correction circuit; therefore, a dual protection circuit for suppressing surge overshoot during PFC rapid ignition startup and shutdown is formed. The power supply stability is improved.