971 results about "Voltage range" patented technology

The invention relates to the technical field of power supply equipment power control. The load power track simulation control method comprises the steps of obtaining voltage information and current information of target power supply equipment, determining power deviation information and a dynamic target voltage range generated on the basis of a preset load behavior prediction model, constructing a combined regulation and control weight vector on the basis of the power deviation information, and obtaining a load power track simulation control result. According to the combined regulation and control weight vector and the dynamic target voltage range, constructing a target power evolution trajectory curve by using a physical response inversion mechanism, executing time discretization processing on the target regulation and control trajectory curve, extracting voltage change values and current change values corresponding to each time step, and calculating the target power evolution trajectory curve; and combining the voltage change value and the current change value according to a time sequence to form a control parameter sequence, and generating an analog control instruction matched with the target power evolution trajectory curve according to the control parameter sequence. The method has the effect of improving the real-time response capability of the power supply equipment under complex working conditions.

The invention relates to the technical field of battery management, and discloses a hybrid battery module equalization method and system based on battery cell health state identification, and the method comprises the steps: carrying out the multi-dimensional state fusion evaluation of a battery cell based on the voltage, temperature and total loop current of the battery cell in a battery module, and obtaining the charge state and health state of the battery cell; based on a preset voltage difference threshold value, performing threshold value judgment on the voltage range of the battery cell to obtain a diagnosis trigger signal of the battery cell; carrying out capacity cross validation on the charge state and the health state to obtain a determination result of capacity inconsistency of the battery cell; carrying out abnormal fluctuation analysis on the voltage change characteristics of the battery cells to obtain an internal resistance inconsistency judgment result of the battery cells; carrying out equalization strategy decision on the battery cell to obtain an equalization mode instruction of the battery cell; performing equalization operation on the battery cell according to the equalization mode instruction; according to the invention, the equalization rate of the hybrid battery module based on cell health state identification can be improved.

The invention relates to the technical field of energy storage battery performance detection, and discloses a performance detection device and method for an energy storage battery, and the method comprises the steps: calculating a thermal safety coefficient based on the internal temperature of the battery, the temperature gradient, the Joule heat generation rate and the environment temperature; calculating a voltage safety coefficient based on the battery end voltage, the voltage change rate and the voltage range; according to the thermal safety coefficient, the voltage safety coefficient, the battery expansion strain and the internal pressure, calculating the collaboration reflecting the multi-physical field state coordination; calculating an aging coefficient based on the accumulated current stress, the accumulated cycle index and the high stress duration of the battery; and finally, based on the collaboration, the aging coefficient and the rated current, calculating the target charging and discharging current and performing real-time adjustment. The device comprises a memory and a processor and is used for executing the method. According to the invention, multi-dimensional fusion evaluation and self-adaptive management of thermal, electrical and mechanical states and aging processes of the energy storage battery are realized, and the operation safety and service life of the battery are remarkably improved.

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

The invention provides an energy storage system battery equalization method, system and device. The battery equalization method of the energy storage system comprises the following steps: acquiring the voltage of each battery module in the energy storage system and the first average voltage of each battery module; if the difference value between the voltage of any battery module and the first average voltage is greater than a first threshold value, determining a first battery module of which the voltage is located outside a first voltage range in the energy storage system; and discharging or charging the first battery modules until the voltage of each first battery module is within the first voltage range. By adopting the battery equalization method, the problem of inconsistency between the battery modules in the energy storage system can be accurately and efficiently solved through real-time monitoring and dynamic adjustment, equalization between the battery modules is realized, the voltage consistency of the whole battery cluster (composed of the battery modules) is further improved, and the battery equalization efficiency is improved. And accelerated performance attenuation caused by long-term over-charging or over-discharging of part of the battery modules is prevented, so that the service life of the whole energy storage system is prolonged.

The invention relates to a voltage output method and system based on a high-voltage power supply widening controller, and belongs to the technical field of high-voltage power supplies. The method comprises the following steps: acquiring a wide-range voltage parameter, and dividing a frequency control region and a pulse width modulation control region of a high-voltage power supply through an arbitration control algorithm to obtain switching judgment information of a power supply working region; constructing a working area switching logic according to the resistance-capacitance network, executing the working area switching logic through a frequency pulse correlation algorithm, coordinating the pulse width and the working frequency, and generating a double-modulation execution signal; a closed-loop negative feedback mechanism is established, and a wide-range overvoltage-free voltage regulation and control instruction is obtained by combining a proportional-integral compensation circuit with a resistance measurement full-right control working frequency and a pulse width; and broadening the output voltage range and inhibiting the overshoot voltage through power supply power driving, coordinating the working frequency and the pulse width in combination with the wide-range overvoltage-free voltage regulation and control instruction, and outputting the wide-range voltage of the high-voltage power supply.

Provided in the present disclosure are a voltage conversion circuit, a charging station, and a control method for a charging station. The voltage conversion circuit comprises a transformer and a change-over switch module, wherein the transformer comprises a primary-side winding, a secondary-side winding and a free winding; the switch module comprises a primary-side change-over switch and a secondary-side change-over switch; a first end of the primary-side winding is used for connecting to an inverter circuit, and a second end of the primary-side winding is connected to the free winding or the inverter circuit by means of the primary-side change-over switch; a first end of the secondary-side winding is used for connecting to a rectifier circuit, and a second end of the secondary-side winding is connected to the free winding or the rectifier circuit by means of the secondary-side change-over switch; and by means of adjusting a connection state between the primary-side change-over switch and the secondary-side change-over switch, the free winding and the primary-side winding are connected in series, or the free winding and the secondary-side winding are connected in series, so as to change the turn ratio of the transformer. In the embodiments of the present disclosure, by means of controlling the states of switches, the turn ratio of a primary side to a secondary side of the transformer is bidirectionally changed in a low-cost manner, thereby expanding the output voltage range of the voltage conversion circuit.

The invention provides a CAN-FD wake-up circuit, a CAN transceiver and an electronic device, the CAN-FD wake-up circuit comprises a level shift module, an amplification comparison module and a wake-up identification module, the differential input end of the amplification comparison module is the source electrode of an NMOS tube, and the source electrode of the NMOS tube allows input of negative voltage, so the level shift module can process a CAN low level signal in a negative voltage range, and the wake-up identification module can process the CAN low level signal in the negative voltage range. Therefore, the input common-mode level range of the wake-up circuit of the CAN-FD is improved. On-off of the first switch is controlled based on whether the CAN transceiver is in a dormant state or a working state so as to control access of the second current source, and the output current of the second current source is a plurality of times of the output current of the first current source so as to increase the bandwidth of the amplification comparison module in the working state. Therefore, the amplification comparison module can be simultaneously applied to the dormant state and the working state of the CAN transceiver, so that the circuit cost is reduced.

The invention discloses a battery pack equalization method, a controller and a battery pack charging system, the battery pack equalization method is applied to a battery pack charging process, a battery pack comprises a plurality of battery cells, and the method comprises the following steps: acquiring voltage values of the plurality of battery cells; when the voltage values of the plurality of battery cells are all in a preset voltage range and meet an equalization condition, selecting a reference battery cell from the plurality of battery cells, and taking the battery cells except the reference battery cell as to-be-equalized battery cells; calculating a voltage difference value between each to-be-balanced battery cell and the reference battery cell; and balancing the corresponding to-be-balanced battery cell according to the calculated voltage difference value. Compared with the prior art, the technical scheme of the invention can reduce the deviation caused by inaccurate reference data, and improve the consistency and equalization efficiency of the full-charge tail end, thereby improving the full-charge effect and releasing the available capacity.

The invention discloses a high-efficiency converter for adjusting the voltage of a power grid, and belongs to the technical field of power electronics. The converter comprises a first voltage regulation circuit, a second voltage regulation circuit, a filter circuit, a detection circuit and a control circuit. By detecting the amplitude difference between the power grid voltage and the load voltage, the control circuit automatically switches the Buck working mode or the Boost working mode, and stable alternating current output in a wide input voltage range is achieved. The invention has the advantages of compact structure, high efficiency, fast response, small harmonic wave and the like, and is suitable for industrial and civil occasions with large-range fluctuation and frequent power grid voltage.

The invention provides a grid-connected and off-grid mode switching control method and device and an energy storage parallel operation system, and relates to the technical field of energy storage systems.The method comprises the steps that if the energy storage parallel operation system is not connected to mains supply within a preset voltage range, the energy storage parallel operation system is controlled to enter an off-grid mode; based on the first voltage characteristic information of the energy storage converter host, controlling the energy storage converter slave to adjust the first voltage parameter; if the electric supply in the preset voltage range is connected to the energy storage parallel operation system, controlling the energy storage converter host to enter a tracking pre-synchronization mode from an off-grid mode, controlling the energy storage converter host to track the electric supply and sequentially adjust the second voltage parameter, and controlling the energy storage converter host to track the energy storage converter host and sequentially adjust the third voltage parameter; and controlling the energy storage converter host and the energy storage converter slave to enter a grid-connected mode at the same time. According to the technical scheme, it is ensured that the voltage parameters of the host and the slave are consistent, parallel operation circulating current oscillation can be avoided to a great extent, and the possibility of system faults is reduced.

The invention discloses an electrode health diagnosis method for a silicon-carbon negative electrode battery with a self-adaptive voltage range, and relates to the technical field of battery control, and the method comprises the steps: obtaining a quasi-static open-circuit voltage discharge curve according to a low-rate discharge test of the silicon-carbon negative electrode battery in an aging process, and measuring the total battery capacity; analyzing and extracting the silicon content in the battery; reconstructing a silicon-carbon composite electrode curve according to the silicon content, and performing inversion calculation of a voltage reconstruction model to obtain electrode parameters; the method comprises the following steps: acquiring charging fragment data of a silicon-carbon negative electrode battery in a circulation process, extracting charging time sequence characteristics based on equal interval voltage alignment and relaxation voltage characteristics after full charge according to the charging fragment data, and constructing a corresponding binary mask array; and constructing an estimation model, and performing supervised learning to obtain a trained estimation model for performing diagnosis of the electrode health parameters according to the charging fragment data, thereby effectively improving adaptability and accuracy during electrode health diagnosis.

The invention discloses a flexible direct-current power transmission system and a fault ride-through method and system thereof. The flexible direct-current power transmission system comprises a main control module, and a new energy sending-out system, an alternating-current energy consumption device, a sending-end converter, a direct-current circuit breaker, a receiving-end converter and a receiving-end alternating-current power grid which are connected in sequence, the direct current circuit breaker is deployed on a direct current power transmission line between the sending end converter and the receiving end converter, and the receiving end converter is a modular multi-level converter formed by cascading a plurality of half-bridge sub-modules with damping branches; the main control module is in communication connection with the half-bridge sub-modules, the direct-current circuit breaker and the alternating-current energy consumption device and used for controlling the damping branches of the half-bridge sub-modules in the running state, the direct-current circuit breaker and the alternating-current energy consumption device to act when a direct-current fault occurs so as to restrain direct current and adjust direct-current voltage to be within a set voltage range. Therefore, no-locking fault ride-through is completed. According to the invention, high-reliability and low-cost DC fault ride-through can be realized.

The invention belongs to the technical field of power supply control, and particularly relates to an improved linear gain digital signal control method applied to a power supply. Aiming at the problems of poor gain linearity, low control precision, slow dynamic response and insufficient adaptability to system parameter change in a wide load and wide input voltage range in the traditional digital control, the method comprises the following steps of: digitally acquiring power supply operation parameters at high precision, and introducing an adaptive linear gain adjustment module to calculate a target control gain. In addition, the method generates a pulse width modulation signal based on the corrected gain and digital operating parameters to regulate the power output, and samples quantized output feedback in real time. Through the scheme, the response speed and stability of the power supply system during transient load change can be remarkably improved, and power supply management with higher precision, higher robustness and faster dynamic response is realized, so that the overall performance of the power supply system is comprehensively improved.

The invention relates to the technical field of buck-boost switching control, and discloses a buck-boost seamless switching MPPT control method which has remarkable advantages. The single-side boost-buck function can stably control the output voltage in a full-voltage range, and the problem that the efficiency and stability of the system are affected due to the fact that the traditional topology cannot accurately regulate and control the power under the photovoltaic high-voltage working condition is effectively solved. A buck-boost mode is seamlessly switched, the response speed and reliability are improved, and faults caused by improper mode switching are avoided; when the method is applied to an energy storage product, the PV high voltage condition does not exist, the additional control logic can be reduced, the system complexity is reduced, the reliability is improved, meanwhile, the development cost and the maintenance difficulty are reduced, and powerful support is provided for photovoltaic system performance improvement and energy storage product optimization.

The invention belongs to the technical field of chip testing, and relates to a power supply chip testing method, system and device and a storage medium. According to the method, the dynamic load jump sequence is constructed by collecting the actual load data of the power supply chip, and the problems that an existing fixed test is separated from an actual scene and single-index evaluation is one-sided are solved by combining continuous input voltage sequential change, periodic start-stop impact test and synchronous monitoring of multi-dimensional parameters. Balance test authenticity and chip safety are controlled through load scaling and an input voltage range, comprehensive performance quantitative evaluation is realized through weighted calculation, a result has higher reference value through a dual evaluation mechanism, and reliable support is provided for design optimization and quality guarantee of a power supply chip.

A transformerless, high efficiency, three-level, high power density, wide input voltage range, single-phase DC / AC inverter is provided. The inverter includes a single DC input power supply, a first semiconductor switch, a second semiconductor switch, a third semiconductor switch, a fourth semiconductor switch, a fifth semiconductor switch, a sixth semiconductor switch, a seventh semiconductor switch, an eighth semiconductor switch, a ninth semiconductor switch, a first inductor, and a second inductor.

The embodiment of the invention provides a voltage exception processing method based on edge calculation, a voltage exception deployment method based on edge calculation and equipment. The method is applied to an edge computing device, the edge computing device is deployed at a predetermined power distribution network node, and the method comprises the following steps: collecting operation parameters of the power distribution network node; extracting a voltage feature vector in the operation parameters, wherein the voltage feature vector comprises at least one of the following: a change rate of a voltage amplitude, a sudden change degree of a voltage phase and a frequency of voltage fluctuation; inputting the voltage feature vector into a preset voltage identification model for processing to obtain a voltage identification result of the power distribution network node; and when the voltage identification result is the voltage abnormal state, generating a voltage adjustment instruction which is used for adjusting the operation parameters of the power distribution network nodes so as to restore the voltage to a predefined voltage range. According to the method, the problem that it is difficult for the power distribution network to quickly identify voltage abnormity and make a response quickly can be effectively solved.

The invention relates to the technical field of power management, in particular to an LDO (low dropout regulator) circuit with a wide input voltage range, which comprises a pre-voltage-stabilizing module, a band-gap reference module, an error amplification module, a voltage-stabilizing control module and a power tube, the pre-voltage-stabilizing module is used for preprocessing a wide-range input voltage into a stable low power supply voltage; the band-gap reference module is used for converting the low power supply voltage into a reference voltage; the error amplification module is used for amplifying the difference value between the reference voltage and the feedback voltage of the output circuit into a high-gain and low-noise control signal; the control signal drives the power tube after being compensated and buffered by the voltage stabilization control module, and the power tube converts the wide input voltage into an LDO output signal. Only one LDO main body circuit is adopted, the wide input voltage range can be achieved, high input voltage can be adapted, low input voltage can also be adapted, the use number of components of an LDO chip is reduced, and the occupied area of the chip is greatly reduced.

A current measurement system, comprising a plurality of parallel sensing circuits, each sensing circuit configured to measure a respective range of voltage corresponding to a current through a load, wherein each sensing circuit is triggered to initiate measurement of a voltage across the load in response to a buffer current through a common buffer reaching a respective threshold, a buffer circuit for inputting a virtual ground voltage or a virtual ground current to the load and to the plurality of parallel sensing circuits, the virtual ground voltage corresponding to the voltage across the load or the current through the load, and a processor coupled to the plurality of parallel sensing circuits, wherein the processor is configured to combine data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the load.

The invention provides a semiconductor device threshold voltage control method, system and equipment and a medium, and the control method comprises the steps: manufacturing a gate dielectric layer, and measuring and obtaining the first thickness of the gate dielectric layer; forming a gate polycrystalline silicon layer on the basis of the gate dielectric layer, oxidizing the surface of the gate polycrystalline silicon layer to obtain an ion barrier layer, and measuring and obtaining a second thickness of the polycrystalline silicon layer and a third thickness of the ion barrier layer; and determining the ion implantation amount of grid pre-doping according to the first thickness, the second thickness and the third thickness so as to perform ion implantation on the grid polycrystalline silicon layer, so that the threshold voltage of the device after grid pre-doping is kept within a preset target voltage range. According to the method, the pre-doped threshold voltage can be dynamically adjusted under the condition of not increasing any device manufacturing process steps, and the threshold voltage control precision and the product stability are guaranteed.

The invention discloses a full-bridge synchronous rectification circuit, which realizes self-driving of two PMOS (P-channel Metal Oxide Semiconductor) tubes of a full-bridge synchronous rectification structure through a gate-source clamping self-driving module, and controls gate-source voltages of the two self-driving PMOS tubes when an output voltage Vo is high, so that the gate-source voltages of the two self-driving PMOS tubes are always clamped in a voltage withstanding range of the two self-driving PMOS tubes, and the problem of overvoltage breakdown is solved. The working voltage range is expanded, and the circuit reliability is improved. In addition, the gate source clamping self-driving module can release excessive energy when the voltage of the rectification output end abnormally drifts high, the load regulation rate can be optimized, and the problem that the output abnormally drifts high can be relieved or avoided.

The invention relates to the technical field of data storage, and discloses a solid state disk temperature cycle test method based on multi-stress coupling, and the method comprises the steps: initializing a test environment; determining the temperature range of the dynamic temperature change test and the voltage range of the dynamic voltage test, and testing the operation record of the solid state disk to be tested according to the temperature range of the dynamic temperature change test and the voltage range of the dynamic voltage test; increasing the vibration frequency of the simulation environment vibration of the solid state disk to be tested in the dynamic temperature change test in which the operation test is kept within the preset time range, and executing a specific type of I / O operation mode test; sMART data, real-time power consumption and link-level bit error rate output by the I / O operation mode are recorded in real time based on the data acquisition system. According to the method, the complex environment of the solid state disk in an actual application scene is comprehensively reflected, the limitation that only single environment stress is considered in a traditional temperature cycle test is overcome, and the test comprehensiveness and accuracy are improved.

The invention discloses an absorption cut-off wavelength adjustable InGaAs photoelectric detector and a preparation method and application thereof. According to the InGaAs photoelectric detector, an N-type InP buffer layer, an N-type absorption layer with gradually-changed components, an N-type InP window layer and an unintentionally-doped InP cover layer are sequentially grown on an N-type InP substrate. According to the invention, the doping modulation is carried out on the N-type absorption layer with gradually-changed components, so that the modulation of the depth of a depletion region of the gradually-changed absorption layer in a relatively wide voltage interval is realized, the modulation precision of wavelength / voltage (nm / V) is improved, and the tunable precision of the absorption cut-off wavelength of the detector is enhanced.

The utility model relates to a MOS tube circuit, especially a kind of wide voltage input protection circuit for the voltage lifting of MOS tube, comprising: power input end, for receiving input voltage in wide voltage range;Filtering capacitor C1 is connected with the power input end;Floating ground circuit, including voltage stabilizing diode D1 and voltage dividing resistor R1, the cathode of voltage stabilizing diode D1 is connected with the power input end, the anode of voltage stabilizing diode D1 is connected with filtering capacitor C1 and voltage dividing resistor R1, the anode of voltage stabilizing diode D1 is as floating ground GND_D, voltage dividing resistor R1 is connected with base circuit GND, to make the anode of voltage stabilizing diode as the reference ground of PMOS tube gate control signal.The utility model provides a kind of wide voltage input protection circuit for the voltage lifting of MOS tube through floating ground circuit, significantly improves MOS tube circuit power adaptability and operating reliability.

The utility model discloses a kind of drive circuits, belong to electric bicycle instrument technical field, specifically related to a kind of electric bicycle instrument drive circuit, comprising: conversion module, output filter and high voltage surge suppression module;Output filter and high voltage surge suppression module are connected with conversion module;Conversion module includes: MOS tube Q6, MOS tube Q9, resistance R20, resistance R19, resistance R18, triode Q5 and triode Q10;Output filter includes: inductance L2, electrolytic capacitor C15, electrolytic capacitor C14, capacitor C13;High voltage surge suppression module includes: transient voltage suppression diode D5;The utility model uses wide input voltage range, high-efficiency switching power supply, replaces traditional linear voltage stabilizer, and efficiency is higher, and heat is smaller, and tolerance to input voltage fluctuation is better, while increasing greater capacity input electrolytic capacitor, effectively absorb transient surge and fill transient voltage drop, in addition, TVS diode is used to suppress high voltage surge, and self-recovery fuse is used to prevent overcurrent.

The utility model discloses a rotary needle shuttle synchronous double servo control system, which comprises a control unit, a communication module, a power supply input module, a switch power supply module and a voltage detection module, and is characterized in that the control unit is used for synchronously and accurately coordinating and controlling two servo motors, the communication module is used for data exchange, and the power supply input module is connected with the switch power supply module. The control module is used for receiving instructions and feeding back system states, the power supply input module is used for providing basic power input support adaptive to a wide voltage range, the switching power supply module is used for converting alternating current input into multi-path stable direct current output, and the voltage detection module is used for accurately monitoring input voltage states in real time. The problems that a traditional rotating needle shuttle system is poor in interference resistance, insufficient in power management and the like are effectively solved, the complexity of the system is remarkably reduced through the compact circuit layout and the modular design, and the system is suitable for equipment upgrading in the fields of spinning, packaging and the like and has certain use value and popularization value.

A system (400) includes an isolated converter (401) having a power transformer (405) with a primary winding (N P1 ), a secondary winding (N S1 ), and an auxiliary winding (N AUX1 ). The system (400) also includes: (a) a first switch (Q L1 ) coupled to the primary winding; (b) a switch controller (410) coupled to the first switch; and (c) a bias power regulator circuit (422) coupled to the auxiliary winding (N AUX1 ) and the switch controller (410). The bias power regulator circuit (422) includes a second switch (Q1). The bias power regulator circuit (422) is configured to provide a bias supply output voltage (V VDD ) to the switch controller (410) based on a first set of modes that modulate a switching frequency of the second switch (Q1) and based on a second mode in which the second switch (Q1) remains switched off.

Secondary battery, characterized in that the secondary battery comprises a cathode foil and an anode foil, wherein the cathode foil comprises an active cathode material, the active cathode material comprising an olive-like phosphate and a lithium-containing oxide; wherein the secondary battery satisfies the following: (a×b) / c = 0.6 to 5; where a denotes a slope of a curve segment between a first oxidation plateau and a second oxidation plateau on a charging curve with a unit of V, obtained at 25°C within an operating voltage range of 2.5 V to 4.25 V; wherein a voltage range of the first oxidation plateau is 3.3 to 3.5 V, while a voltage range of the second oxidation plateau is 4.0 to 4.1 V; where b ↑a volume-phase lithium-ion transport impedance of the cathode foil in an EIS test at a SOC value corresponding to a minimum value between a first curve peak and a second curve peak of a dQdV-V curve at 25°C within the operating voltage range of 2.5 V to 4.25 V; where c denotes a decay rate of an anode potential during a charging process of the secondary battery at 25°C within the operating voltage range of 3.7 V to 4.25 V with a unit of V-1.

The invention discloses a CRM totem pole three-phase interlaced PFC control method, which comprises a signal sampling circuit, a filter circuit, a control circuit, an auxiliary winding circuit and a main power loop circuit, adopts a voltage mode control strategy, does not need a current inner loop, and simplifies a control system. The signal sampling circuit comprises an input voltage sampling circuit, an output voltage sampling circuit, an auxiliary winding voltage sampling circuit and an inductive current sampling circuit. The main power loop circuit comprises a first phase circuit, a second phase circuit and a third phase circuit which are mutually staggered and connected in parallel. The auxiliary winding circuit is used for controlling the turn-on time of the active tube, and the inductive current sampling circuit is used for controlling the turn-off time of the follow current tube, so that soft turn-on of the active tube in a full input voltage range is realized. The method can be expanded to an N-phase interleaving PFC system, and high-frequency current ripples are reduced through phase shift control. The method is suitable for occasions with high requirements on power supply performance, such as server power supplies and electric automobiles.