63 results about "Active power factor correction" patented technology

The invention discloses a high-power all-gallium nitride LED driving power supply circuit which comprises an EMI filtering and rectifying circuit, a GaN active power factor correction circuit, a GaN half-bridge LLC resonant converter circuit and a GaN synchronous rectifying and filtering circuit. The PFC and LLC combined control module integrates a power factor correction function and a resonance circuit frequency regulation function, the GaN active power factor correction circuit is connected with the PFC and LLC combined control module to realize power factor correction, and the GaN half-bridge LLC resonant converter circuit is connected with the PFC and LLC combined control module to realize output power regulation; and a constant-current voltage-limiting feedback circuit for outputting current and voltage detection feedback is arranged between the GaN synchronous rectification filter circuit and the PFC and LLC combined control module. The advantages of high efficiency of the GaN switching tube and high working frequency of the circuit are utilized, so that power loss and heat dissipation requirements are reduced, and the efficiency and power density of the LED power supply are improved. The invention has the advantages of high efficiency, high power density, high reliability and the like.

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.

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

The invention relates to an active power factor correction device, in the active power factor correction device, an average current controller and a feed-forward compensation controller are respectively used for obtaining a first duty ratio and a second duty ratio, a duty ratio processor is used for superposing the first duty ratio and the second duty ratio to obtain a total duty ratio, the pulse width modulation controller is used for generating a pulse width modulation signal for controlling the switching device according to the total duty ratio, the second duty ratio is related to the sum of inductive currents sampled for multiple times in a power frequency period, and the sum of the inductive currents changes along with the load power of the main circuit. Therefore, the second duty ratio can reflect the dynamic change of the load power, the total duty ratio is obtained by superposing the first duty ratio and the second duty ratio, the feedback can be enhanced when the load power changes, and compared with the control by only using the average current method, the control capability on the output voltage and the input current is improved, and the control efficiency is improved. And a better power correction effect can be realized.

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 invention discloses a quick load response phased array equipment power supply system of a transfer bus framework. The quick load response phased array equipment power supply system comprises a power filter, a surge protector, a three-phase active power factor correction circuit, a bus converter array, a quick response non-isolated load point converter and a non-isolated load point converter, the parallel redundant bus converter array completes electrical isolation and voltage conversion from a high-voltage direct current bus to a transfer bus, the non-isolated load point converter completes auxiliary power supply of a T / R unit of phased array equipment and power supply of an array plane control circuit, and the quick response non-isolated load point converter completes drain power supply of the T / R unit. According to the rapid load response phased array equipment power supply system of the transfer bus architecture, power supply for the drain electrode of the array plane T / R unit is completed by cascading the parallel redundant bus converter with the distributed rapid response non-isolated load point converter, so that the task reliability of the power supply system is improved; and the power density and the transient response capability of the load point converter are improved.

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 utility model relates to the technical field of chargers, in particular to a high-efficiency multifunctional charger, which is internally provided with a circuit module, and the circuit module comprises a singlechip function module circuit, a singlechip power supply circuit, an LLC resonant converter circuit and a switching power supply main control chip circuit, the output end of the LLC resonant converter circuit is in signal connection with the input end of the single-chip microcomputer power supply circuit. The active power factor correction circuit comprises a rectifier bridge BD1, and a pin 2 and a pin 4 of the rectifier bridge BD1 are in signal connection with the LLC resonant converter circuit; lLC resonance spectrum extension is used for replacing traditionally used forward spectrum extension, the power supply conversion efficiency is improved, a single-chip microcomputer is used for writing a program, adaptation of batteries with different capacities and different battery voltages is achieved, the output power is reduced according to rising of the temperature of a charger, multiple kinds of charger protection are achieved, and the power supply conversion efficiency is improved. Energy conservation and carbon reduction can be achieved, and the trouble that different batteries need to use corresponding chargers is avoided.

The invention relates to a system (2) for converting a first electrical voltage (U1) into a second electrical voltage (U2) comprising an electromagnetic disturbance filtering stage (4) and an active power factor correction stage (6) connected to the output of the electromagnetic disturbance filtering stage (4) via at least one main inductor (8), the active power factor correction stage (6) comprising a low-frequency electronic switching branch (16) and at least one high-frequency electronic switching branch (18), the number of high-frequency electronic switching branch(es) (18) being equal to the number of main inductor(s) (8), the electrical conversion system (2) further comprising a saturable inductor (9) with a saturation current threshold,the inductance value of said inductance (9) when it is not saturated being substantially equal to the inductance value of the main inductance (8). Abstract figure: Fig. 1,

1. Name of the designed product: inductance. 2. Use of the designed product: the designed product is mainly used for storing electric energy in active power factor correction circuit. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

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 utility model provides an efficient compact type LED driver. The efficient compact type LED driver is composed of a driver shell, a transmission wire, a circuit device and heat dissipation silica gel. The driver shell comprises an upper cover shell and a base shell, and an electronic device containing cavity is formed in the driver shell and used for fixing the circuit device. The circuit device comprises a plurality of gallium nitride components, an anti-interference rectification input circuit, an active power factor correction circuit, an isolation conversion circuit, a main control circuit and a rectification filtering output circuit. The active power factor correction circuit and the isolation conversion circuit respectively adopt gallium nitride switch tubes, and gallium nitride semiconductors have the characteristics of low on resistance, high breakdown voltage, small size and light weight, so that the gallium nitride switch tubes can efficiently work at high frequency, energy loss is reduced, the energy conversion efficiency of the efficient compact LED driver is improved, and the service life of the efficient compact LED driver is prolonged. Therefore, the high-efficiency compact LED driver is suitable for light and thin LED lamps.

The utility model relates to the technical field of industrial process control, in particular to a power supply conversion module. The power supply conversion module comprises an EMI filter circuit, a rectification filter circuit, an active power factor correction circuit, a high-frequency converter, a PWM control circuit, a CPU module and the like. Wherein the PWM control circuit forms closed-loop feedback by receiving an instruction of the CPU module or judging a sampling value of a secondary side output voltage, and then generates a pulse width modulation signal for controlling the active power factor correction circuit and the high-frequency converter so as to keep the output voltage stable; the CPU module is used for monitoring the state of the power supply module, sending a control instruction to the PWM control circuit, and reporting data to a main device through the RS232 communication module. The power supply conversion module provided by the utility model has the characteristics of stable output, input overvoltage and undervoltage protection, output overvoltage and undervoltage protection, output overcurrent protection, over-temperature protection and the like.

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.

The invention discloses an active power factor correction circuit, a switching power supply and electronic equipment. The active power factor correction circuit comprises an input filter rectifier module, a control main module, an input voltage detection module and an output voltage control module. The input voltage of the active power factor correction circuit is detected through the input voltage detection module, the output voltage control module can output a control signal to adjust the magnitude of the output voltage according to the magnitude of the input voltage, and when it is detected that the input voltage becomes low, the control signal is output to control the output voltage to be reduced. When it is detected that the input voltage is increased, the control signal is output to control the output voltage to be increased, so that the voltage difference between the output voltage and the input voltage is relatively stable, it is guaranteed that the M value of the active power factor correction circuit is relatively stable, and the problem that the circuit is unstable due to large-range change of the input voltage is solved.

The invention relates to a system (2) for converting a first electrical voltage (U1) into a second electrical voltage (U2) comprising an electromagnetic interference filtering stage (4) and an active power factor correction stage (6) connected to the output of the electromagnetic interference filtering stage (4) via at least one main inductor (8), the active power factor correction stage (6) comprising a low-frequency switching electronic branch (16) and at least one high-frequency switching electronic branch (18), the number of high-frequency switching electronic branch(es) (18) being equal to the number of main inductor(s) (8), the electrical conversion system (2) further comprising a saturable inductor (9) with a saturation current threshold,the inductance value of said inductance (9) when it is not saturated being substantially equal to the inductance value of the main inductance (8). Figure from the abstract: Fig. 1,

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.

This invention discloses a fast load response phased array equipment power supply system with a relay bus architecture, comprising: a power filter and surge protector, a three-phase active power factor correction circuit, a bus converter array, a fast-response non-isolated point-of-load (POLO) converter, and a non-isolated POLO converter. The parallel redundant bus converter array completes electrical isolation and voltage conversion from the high-voltage DC bus to the relay bus. The non-isolated POLO converter provides auxiliary power supply for the T / R units of the phased array equipment and power supply for the array control circuit. The fast-response non-isolated POLO converter provides drain power supply for the T / R units. This invention's fast load response phased array equipment power supply system with a relay bus architecture, through parallel redundant bus converters cascaded with distributed fast-response non-isolated POLO converters, completes drain power supply for the array T / R units, improving the reliability of the power supply system and enhancing the power density and transient response capability of the POLO converters.

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 utility model discloses a cold and hot controller with an active power factor correction function, which relates to the technical field of controllers and comprises a shell, a power factor correction module, a power factor correction module and a power factor correction module. The operation panel is arranged on the shell; the circuit board is arranged in the shell, is electrically connected with the operation panel and is provided with an active power factor correction module; the heat conduction assembly comprises a heat conduction plate and a heat dissipation piece, the heat conduction plate is installed on the shell and used for installation of the circuit board, the heat dissipation piece is installed on the side, away from the circuit board, of the heat conduction plate, and the heat dissipation piece is used for circulation of a cold medium. According to the technical scheme provided by the utility model, the problem of poor heat dissipation effect of the existing controller can be solved.

An APFC converter control method includes: obtaining an output voltage, an input voltage and an inductor current of the APFC converter; obtaining a voltage adjustment value according to a voltage error value between a preset reference voltage and the output voltage; obtaining a reference current according to the voltage adjustment value and the input voltage; obtaining a current error value according to the reference current and the inductor current; obtaining an adjustment coefficient of the proportional integration parameter; adjusting an integration parameter and a proportional parameter according to the adjustment coefficient; calculating an output control value according to the integration parameter, the proportional parameter and the current error value; and comparing the control value with sawtooth harmonics to adjust the duty cycle and to output a PWM signal.

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.

1. Name of the designed product: inductance. 2. Use of the designed product: the designed product is mainly used for storing electric energy in active power factor correction circuit. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The invention relates to a system (2) for converting a first voltage (U1) into a second voltage (U2), comprising an electromagnetic interference filtering stage (4) and an active power factor correction stage (6) connected to an output of the electromagnetic interference filtering stage (4), the active power factor correction stage (6) comprises a bidirectional synchronous bridge rectifier (16) and at least one high-frequency electronic switching branch (18) connected to the output of the rectifier (16) via at least one main inductor (8), the number of high-frequency electronic switching branches being equal to the number of main inductors, the electrical energy conversion system (2) further comprises a saturable reactor (9) having a saturation current threshold, the inductance of said reactor (9) when unsaturated being substantially equal to the inductance of the main inductor (8).

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 a conversion system (2) for converting a first voltage (U1) into a second voltage (U2), the system comprising an electromagnetic interference filtering stage (4) and an active power factor correction stage (6) connected at the output of the electromagnetic interference filtering stage (4) via at least one main inductor (8), the active power factor correction stage (6) comprising a low-frequency switching electronic branch (16) and at least one high-frequency switching electronic branch (18), the number of high-frequency switching electronic branches (18) being equal to the number of main inductors (8), the electrical conversion system (2) further comprising a saturable inductor (9) with a saturation current threshold, the inductance value of the inductor (9) when it is not saturated being substantially equal to the inductance value of the main inductor (8).

The invention relates to the technical field of power electronics, in particular to an integrated power conversion topology circuit based on an APFC and an AHB. The power supply conversion topology circuit comprises an alternating current source AC1 which is rectified into sine half-wave voltage through a bridge rectifier BR1 and a filter capacitor C1; the energy storage inductor L1 is connected with the second switch tube Q2 in series, and when the second switch tube Q2 is switched on, the energy storage inductor L1 is charged through a first diode D1 to store energy; and the first switching tube Q1 and the output filter capacitor C2 are connected in series and in parallel into a loop, and zero-voltage switching is realized by setting dead time. The APFC active power factor correction function and the AHB asymmetric half-bridge soft switch topology are integrated in one circuit, the circuit structure is remarkably simplified, the number of components is reduced, and therefore the cost of the power converter is greatly reduced.

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.