46results about How to "Reduce conduction loss" patented technology

The application provides an inverse-conducting insulated gate bipolar transistor and a preparation method thereof, and belongs to the technical field of power semiconductor devices, and comprises: a first groove is a gate groove, a second groove is an emitter groove, and a third groove is an ineffective gate groove; in the lateral direction parallel to the cell surface, the first groove, the second groove and the third groove are sequentially and spacedly arranged, and the first groove and the second groove are connected through a fourth groove, and the fourth groove is a gate groove; in the longitudinal direction, the second groove is located between two adjacent fourth grooves. The beneficial effects are as follows: the gate groove and the ineffective gate groove are connected through the lateral gate groove, the forward conduction voltage drop and the conduction loss of the device are reduced; the current channel is increased, the current distribution is more uniform, the heat loss is reduced, the reliability and the power density of the device are improved; the emitter groove is used for repeatedly arranging the polysilicon gate and the metal gate in the lateral and longitudinal directions, the regularly arranged diodes and Schottky diodes are formed, and the reverse diode current distribution is more uniform.

The application discloses a kind of modular multilevel converter thermal balance control method and system based on dynamic retention factor, for the thermal imbalance problem of flexible direct current transmission modular multilevel converter, propose thermal-electricity collaborative control method based on dynamic retention factor (DRF), break through the limitation of traditional capacitor voltage balancing strategy.Capacitor voltage tolerance boundary (rated value ±5%~10%) is set, combined with real-time temperature feedback to build dynamic weight adjustment mechanism, collect IGBT junction temperature to calculate normalized temperature deviation value, generate dynamic retention coefficient, and then obtain the corrected capacitor voltage, in charging mode, low-temperature module is preferentially put into in ascending order, in discharging mode, high-temperature module is preferentially put into in descending order;Further integrate model predictive control (MPC), based on thermal model rolling solution minimization temperature difference objective function, adjust dynamic adjustment coefficient ΔK.The scheme can effectively solve the problem of small-capacitor module thermal fatigue early decline, provide high reliability technical support for high-voltage high-power new energy grid-connected equipment.

The application discloses a totem pole power factor correction circuit, a control method, a device and equipment, the circuit includes a rectifier module, a reactor, a capacitor module, a control module and a switching module, the input end of the rectifier module is connected with an alternating current power supply, and the output end of the rectifier module is used for being connected with a load; the capacitor module is connected with the output end, and includes a first capacitor and a second capacitor in series connection, and the first connection point of the first capacitor and the second capacitor is connected with the alternating current power supply through the switching module; by setting the control module, the rectifier module and the switching module can be controlled according to load parameters, so that the totem pole power factor correction circuit is switched to a synchronous rectification mode or a non-controlled rectification mode, so that the totem pole power factor correction circuit can reduce loss and save resources under the condition that load parameters change, and the circuit efficiency is ensured. The application can be widely applied in the technical field of control.

The application relates to the technical field of ocean exploration measurement, and discloses a Doppler log power supply control method and system based on hierarchical intelligent control, which comprises the following steps: acquiring and adaptively filtering original electrical and environmental signals by using a multi-parameter dynamic detection module; performing integration autoregressive moving average model identification based on load current sampling data by using a load adaptive adjustment module, and outputting predicted load current values; combining the prediction results to generate a feedforward instruction, so as to adjust the target switching frequency, duty cycle and working mode of a direct-current-to-direct-current conversion circuit; and using a stability verification layer to evaluate control loop indexes in real time based on a linear periodic time-varying Nyquist criterion, and sending an instruction change control parameter or a warning threshold at an instability critical point. The application improves the power conversion efficiency and dynamic response lag problem under a variable load environment, and improves the anti-disturbance capability and operation reliability of a Doppler log power supply system.

This application discloses a low-power underwater acoustic communication system for underwater navigation and ranging, relating to the field of underwater communication technology. It includes a digital signal processing platform for preprocessing the digital baseband signal to be transmitted to obtain a single-ended analog signal; a transmitting circuit module, comprising at least: a power amplification unit; the power amplification unit being a single chip integrating a PWM modulation circuit, a drive amplification circuit, and a power amplification circuit, wherein the power amplification unit sequentially performs PWM modulation, drive amplification, and power amplification on the single-ended analog signal to output a target amplified signal; and an underwater acoustic transducer for converting the target amplified signal into an acoustic signal and transmitting it into the water medium. This application can reduce energy loss during signal transmission.

The application discloses a resonant converter control method and device based on threshold voltage control, and the method comprises the following steps: comparing an input voltage with a primary side equivalent voltage to determine whether the resonant converter is currently working in a boost mode or a buck mode; determining threshold voltages of a resonant capacitor in the boost mode and the buck mode; comparing the threshold voltages with collected resonant capacitor voltages to determine switching signals of an inverter circuit; and the threshold voltages of the resonant capacitor in the boost mode and the buck mode are calculated based on P-stage cosine response parameters and N-stage cosine response parameters of the resonant capacitor voltages. By using the above technical scheme, the resonant converter has strong voltage ripple suppression capability, effectively suppresses secondary harmonic voltage ripples from a previous stage, and the control signals are directly determined by input and output states, thereby having excellent dynamic performance.

The invention discloses a resonant dual-active bridge converter and a control method, and the converter comprises a primary full-bridge circuit, a secondary full-bridge or half-bridge circuit, a transformer, and an LC resonant network composed of a resonant inductor and a resonant capacitor which are connected in series. The control method comprises the following steps: acquiring parameters of an input voltage V1, an output voltage V2, a transmission power P, a transformer turn ratio N, a resonant inductance Lm and a resonant capacitance Cr of the converter; and calculating a primary fundamental wave equivalent voltage and a secondary fundamental wave equivalent voltage, and calculating an inner phase shift angle alpha between a first bridge arm and a second bridge arm in the primary full-bridge circuit through the primary fundamental wave equivalent voltage and the secondary fundamental wave equivalent voltage. The LLC converter has the beneficial effects that the inherent defects that the gain range of a traditional LLC converter is narrow (generally only 0.8-1.2) and the circulating current is sharply increased and the efficiency is sharply reduced when the voltage is seriously mismatched in the traditional phase-shifting DAB are fundamentally overcome.

The application discloses a Sepic type power correction circuit based on a switched inductor, which comprises switching tubes S1-S3, diodes D1-D5, inductors L1-L5, capacitors C1 and C o The diodes D3-D5 and the inductors L4 and L5 form a switched inductor structure, and the voltage gain of the converter is D / (2-D). Compared with a conventional Sepic PFC converter, the Sepic type power correction circuit based on the switched inductor improves the step-down gain, ensures that the whole duty cycle range is in a step-down state, and has a larger duty cycle than the conventional Sepic PFC converter in the case of a high step-down ratio, thereby effectively avoiding the emergence of a limit duty cycle. The no-bridge structure can realize lower conduction loss. The original output diode is replaced by the switched inductor structure, so that the output current is continuous, and the output current can be filtered. All the switching tubes are common ground, and a lower-cost driving circuit can be used.

The application discloses a bridgeless Cuk PFC converter based on a switched-inductor-capacitor structure, which comprises switching tubes S1-S3, diodes D1-D4, inductors L1-L5, capacitors C1, C2 and C o The diodes D3 and D4, the capacitor C2 and the inductors L3 and L4 form a switched-inductor-capacitor structure. The original freewheeling diode is replaced by the switched-inductor-capacitor structure, so that the voltage gain of the converter is D / 2(1-D), compared with a traditional Cuk PFC converter, the converter realizes positive voltage output and improves the voltage reduction gain, and the duty cycle range in the voltage reduction mode is wider. Meanwhile, the bridgeless structure is adopted, so that lower on-state loss can be realized. The converter has continuous input and output currents, high power factor and high efficiency, and has rich application.

The application belongs to the field of solid-state lithium battery materials, and provides a polymer-based solid-state electrolyte film, a preparation method and application thereof, and the application forms a crosslinked shell layer formed by polyvinyl alcohol, polyethylene glycol diglycidyl ether, boric acid and lithium hydroxide monohydrate outside a polyvinylidene fluoride-hexafluoropropylene copolymer core microsphere, and is dry-mixed and hot-pressed into a film with lithium bisfluorosulfonylimide to form a core-shell composite microsphere conduction and support system, so that the film body maintains the processability while taking into account the chain segment movement, structure constraint and residual solvent control, solves the problem that the mechanical strength and ion conduction, the processing fluidity and the electrochemical stability are difficult to be considered, and is suitable for a full solid-state lithium secondary battery.

The application discloses a three-level full-bridge dual active bridge converter and a midpoint potential balance control method. The converter comprises a high-frequency transformer, a DC input voltage source is arranged on the primary side of the high-frequency transformer, and series-connected upper and lower capacitors are connected between the positive and negative electrodes of the DC input voltage source. Three-level half-bridge A and three-level half-bridge B are connected in parallel, a node between the upper and lower capacitors is connected to the midpoint of two clamping diodes of the two three-level half-bridges, the center point of the three-level half-bridge A is connected to one end of the primary side of the high-frequency transformer through a power transmission inductor, and the center point of the three-level half-bridge A is connected to the other end of the primary side of the high-frequency transformer through a DC isolation capacitor. In the control method, the primary side power device is divided into a fixed 50% duty ratio basic bridge arm and a non-symmetrical duty ratio adjusting bridge arm, a PI voltage balance loop is constructed by taking the voltage difference of the two capacitors as feedback, the duty ratio of the adjusting bridge arm is dynamically adjusted, the average value of the midpoint current is changed, and the midpoint potential balance is realized.

This invention relates to the field of electronic circuit technology and provides a method and apparatus for dynamically adjusting the dead time of a full-bridge circuit. The method includes: acquiring the current of each arm of the full-bridge circuit; for any arm, determining one MOSFET as the driving transistor and the other as the freewheeling transistor based on the direction of the current; if the driving transistor is on and the freewheeling transistor is off, then after controlling the driving transistor to turn off, determining the peak current based on the current of the driving transistor during its on-time, and controlling the freewheeling transistor to turn on when the current is less than the peak current. This invention solves the problem that existing dead time setting methods are difficult to dynamically optimize and adjust, and cannot adapt to real-time changes in operating conditions.

The invention discloses a bridge arm compensation modulation method suitable for a bridge arm multiplexing type modular multi-level high-voltage direct-current converter, and belongs to the technical field of high-voltage direct-current power transmission. The method comprises the following steps: firstly, generating respective quasi square wave reference voltage waveforms and quasi square wave reference current waveforms of a high-voltage bridge arm, a low-voltage bridge arm and a multiplexing bridge arm, then obtaining respective actual voltage reference values of the high-voltage bridge arm, the low-voltage bridge arm and the multiplexing bridge arm, then cooperatively adjusting the voltage of each bridge arm, generating a switching control instruction of each sub-module in each bridge arm, and finally switching the sub-modules in each bridge arm. And controlling the bridge arm current to complete quasi square wave commutation within a preset transition time, and completing bridge arm compensation modulation of the converter. The power transmission capacity, the dynamic response and the waveform quality are remarkably improved, meanwhile, the device is easily integrated into an existing bridge arm multiplexing type modular multi-level high-voltage direct-current converter, and the device is suitable for interconnection scenes of different direct-current voltage levels in a high-voltage direct-current power grid.

The invention provides a novel RC-IGBT structure with a hole circulation path and a good compromise relationship, which comprises a device main body, collector metal is arranged at the bottom of the device main body, a p + collector region, an FS layer, an n-drift region, a groove with a grid electrode at the top, an n + emitter region, a p + contact region and a p base region are sequentially arranged upwards, a second CS storage layer is arranged at the bottom, and the emitter composite structure on the two sides comprises a deep p-type region, a deeper p-type region, a hole channel and a CS storage layer. Through the above structure, the deep p-type region and the deeper p-type region optimize the electric field distribution, improve the doping concentration of the CS layer, enhance the hole accumulation effect, reduce the conduction voltage drop, accelerate the carrier export during the turn-off of a hole channel, and shorten the turn-off time, and at the same time, under the short-circuit working condition, the structures cooperatively export holes, weaken the conductivity modulation effect, improve the short-circuit endurance capability, and improve the performance of the device. And finally, good balance of voltage resistance, conduction voltage drop and switching speed is realized, and the comprehensive performance of the device is remarkably improved.

The invention provides a control method, system and device of a resonance-based isolated active bridge converter and a medium. The system comprises a primary side circuit module, an L-C series resonant cavity, a high-frequency transformer and a secondary side circuit module. The method comprises the following steps of: sampling primary and secondary voltage and current, calculating voltage gain, and solving threshold current of primary and secondary switching tubes for realizing zero voltage switching (ZVS) in combination with junction capacitance and dead time; geometric constraints of resonance current and capacitor voltage are established based on phase plane analysis, the proportions of a primary side inner phase shift angle, a secondary side inner phase shift angle and an outer phase shift angle relative to a resonance period are solved in a unified mode, and then the switching frequency is determined; and converting to obtain an actual phase shift angle and generating a gate pole driving signal, thereby realizing full-working-condition ZVS of the primary and secondary side devices. The soft switching boundary is accurately given in the wide voltage gain and wide load range, the peak value and the effective value of the resonance current are remarkably reduced, the conduction and switching loss are considered, the circulation is suppressed, and the efficiency and the power density are improved.

This invention provides a high UIS reliability planar gate silicon carbide VDMOS, comprising: a drift layer connected to a silicon carbide substrate; a gate protection zone and a shunt region within the drift layer, the gate protection zone being connected to the shunt region; a protrusion on the drift layer; a source protection zone connected to the drift layer and the protrusion; a grounded source protection zone; a P-type well region connected to the source protection zone and the protrusion; an N-type source region and a P-type source region on the P-type well region, the N-type source region being connected to the P-type source region and the P-type well region; a lower side of an insulating dielectric layer connected to the P-type well region and the protrusion; a lower side of a gate metal layer connected to the upper side of the insulating dielectric layer; source metal layers connected to the P-type source region and the N-type source region respectively; and a drain metal layer connected to the lower side of the silicon carbide substrate. The UIS resistance and reliability of the device are improved through the gate protection zone and the grounded source protection zone.

The invention relates to the technical field of battery management, and discloses a battery management system, method and device, a medium and an unmanned aerial vehicle. The active equalization management circuit is electrically connected with the series battery pack and is used for collecting state information of the single batteries and executing bidirectional active equalization control on the series battery pack; the interface unit is used for establishing electric connection with external equipment; wherein the series battery pack and external equipment form a direct connection type main loop through the interface unit, and energy on-off control of the direct connection type main loop is realized through physical plugging of the interface unit. Energy on-off control is realized through physical plugging of the interface unit, an electronic power switch device is prevented from being arranged in a main loop, the design of the main loop is effectively simplified, and hardware complexity and control difficulty are reduced. And a direct connection type main loop is formed by the series battery pack and the external equipment, so that the number of intermediate devices in the main loop is reduced, the conduction loss is effectively reduced, and the energy transmission efficiency is improved.

A three-level double-buck conversion circuit for a post-stage of an energy storage inverter integrated device, comprising an energy storage battery, a bidirectional DC-DC converter, switching tubes S1, S2, S3, S4, S5, S6, S7, diodes D1, D2, D3, D4, D5, D6, D7, inductors L1 and L2, and capacitors C1 and C2. The three-level double-buck conversion circuit comprises a bidirectional switching tube composed of switching tube S4, diodes D3, D4, D5, and D6, and a double-buck circuit structure composed of switching tubes S2 and S3, diodes D1 and D2, and inductors L1 and L2. The three-level double-buck conversion circuit of the present application organically integrates three-level technology and a double-buck circuit structure, and has the advantages of low switching tube voltage stress, high reliability, and high efficiency.

The application provides a kind of driving circuit, system and control method of power semiconductor, it is related to electronic circuit technical field, including: positive power supply end provides positive driving voltage to the gate of power semiconductor device;First and second positive power supply module respectively output driving positive voltage, and the driving positive voltage that second positive power supply module outputs is higher;Switching module controls the on-off of second positive power supply module and positive power supply end;Negative power supply end provides off negative voltage;Control module controls switching module to keep open in the power semiconductor device opening transient process, controls switching module to close after power semiconductor device enters conduction steady state, controls switching module to restore open before the off transient process of power semiconductor device starts.This application realizes the accurate control of conduction loss by the cooperative control of double positive power supply module and switching module, reduces the conduction loss, improves system efficiency, enhances device operation reliability.

The utility model belongs to the technical field of filament mounting structures, and particularly relates to a high-efficiency filament clamping device capable of being connected with different numbers of power supplies, which comprises a base, at least one pair of conductive columns and at least one filament, each pair of conductive columns penetrates through the base and is electrically connected with one power supply, and the filament is electrically connected with the conductive columns. The two ends of the connecting position of the conductive column and the base are respectively provided with an insulating piece which wraps the conductive column, the base is further provided with a supporting piece which is connected with the lamp filament, the bottom of the conductive column is provided with an inserting hole, and the conductive column can be rapidly connected with a power source. And the device can be connected with a plurality of independent power supplies to control the density of the electron flow, so that the device can be used in a plurality of working areas.

The invention discloses a hybrid five-level bidirectional active bridge containing an auxiliary branch and a control method thereof, and relates to the technical field of power electronics, and the hybrid five-level bidirectional active bridge comprises the steps: introducing an auxiliary bridge arm and a coupling auxiliary transformer into a primary side circuit, and enabling the primary side of a high-frequency transformer to generate five step levels by controlling the state of the bridge arm. According to the control, real-time voltage gain is calculated, a target switch time sequence mode is automatically selected according to the relation between the real-time voltage gain and a preset reference threshold value, and an optimal phase shift combination is calculated by calling a GOC optimization algorithm with the purpose of minimizing inductive current stress. According to the method, a plurality of voltage matching points are physically constructed through the coupling auxiliary transformer, and more control freedom degrees are provided for current stress optimization; and a GOC optimization equation is utilized to ensure that the device operates at a current stress minimum point under all working conditions. Through collaborative optimization of software and hardware, current stress of all working conditions is reduced, a ZVS region in a full load range is widened, and efficiency and stability of a wide voltage working range are improved.

The application provides an LLC converter control device and method based on an extended harmonic impedance model. The proposed synchronous rectification method needs to calculate the sampling signals of output direct current voltage and current in a digital signal processor (DSP), and establishes an impedance model in a frequency domain by considering harmonics, so that the synchronous rectification conduction time is accurately calculated. The turn-on time of the synchronous rectification tube is consistent with the primary side switch tube device, and the turn-off time of the synchronous rectification tube is equal to the turn-on time plus the calculated synchronous rectification conduction time. The method not only minimizes the conduction time of the synchronous rectification body diode, has high calculation accuracy, and has high anti-interference on high switching frequency noise, and the proposed method greatly improves the efficiency of the LLC converter.

This application provides a DC filter component with negative voltage surge protection and reverse connection protection, relating to the field of electronic technology. It includes: a reverse connection protection circuit, a discharge circuit, a data acquisition and control circuit, and an input common-mode filter circuit. The reverse connection protection circuit includes a first NMOS transistor, whose drain is connected to the negative bus, its source is electrically connected to the first system ground, and its gate is electrically connected to the positive bus through a target resistor. The data acquisition and control circuit acquires the bus voltage and controls the first NMOS transistor to be turned off for a first preset time period when the bus voltage is less than or equal to a first preset voltage threshold. When the input power is lost, a group of capacitors is discharged through a first discharge resistor during the period when the bus voltage drops to a second preset voltage threshold, and a group of capacitors is discharged through a second discharge resistor during the period when the bus voltage drops from the second preset voltage threshold to a preset safe voltage value. Implementing the technical solution of this application improves the reliability of the DC filter component.

This application discloses a DAB converter and its driving control method. The method includes: obtaining the voltage transfer ratio based on the input voltage and output voltage of the DAB converter; obtaining the feedforward power based on the input voltage, voltage transfer ratio, and output current of the DAB converter; obtaining the primary-to-secondary side shift ratio based on the input voltage, output voltage, voltage transfer ratio, input current, and feedforward power of the DAB converter; obtaining the primary-side inward shift ratio and the secondary-side inward shift ratio based on the voltage transfer ratio, feedforward power, and the primary-to-secondary side shift ratio; and driving the DAB converter based on the primary-side inward shift ratio, the secondary-side inward shift ratio, and the primary-to-secondary side shift ratio. This invention optimizes the values ​​of the primary-side inward shift ratio, the secondary-side inward shift ratio, and the primary-to-secondary side shift ratio using relevant parameters of the DAB converter to achieve precise driving control of the DAB converter. By adjusting the control parameters of the DAB converter, the soft-switching range can be expanded, current stress reduced, and light-load efficiency improved, while significantly increasing the system's energy conversion rate.

This invention discloses a reverse polarity protection circuit, an integrated circuit, and an electronic circuit including the integrated circuit. The integrated circuit includes an input terminal for receiving an input voltage, an output terminal for providing an output voltage, a reference terminal, a power ground terminal, a power transistor, a main control circuit, a variable resistor circuit, and a drive circuit. The power transistor has a current conduction path coupled between the input terminal and the output terminal and a control terminal. The main control circuit provides a control signal based on the potential of the reference terminal to the control terminal of the power transistor. The variable resistor circuit is coupled between the reference terminal and the power ground, switching between an on state and an off state based on a drive voltage applied to a control terminal of the variable resistor circuit. The drive circuit adjusts the drive voltage based on the voltage polarity of the input voltage or the output voltage. Using embodiments of this invention, the reliability of the protection circuit is ensured while maintaining low conduction losses.

The application discloses a semiconductor device and a manufacturing method thereof. The semiconductor device comprises: a substrate semiconductor substrate having a first main surface and a second main surface opposite to the first main surface; an insulated gate bipolar transistor region; a fast recovery diode region; an insulating layer provided with a first contact hole and a second contact hole respectively located in the fast recovery diode region and the insulated gate bipolar transistor region; a first semiconductor region located in the fast recovery diode region; a first titanium film provided in the first contact hole; a second semiconductor region located in the insulated gate bipolar transistor region; a second titanium film provided in the second contact hole; the depth of the first semiconductor region from the first main surface to the semiconductor substrate in a first direction is A, the depth of the second semiconductor region from the first main surface to the semiconductor substrate in the first direction is B, and A and B satisfy the relationship: A <= 0.45B. The technical scheme can improve the reverse recovery performance of the semiconductor device.

The invention discloses an energy storage module with precise voltage regulation and constant current, and belongs to the technical field of power electronics and energy storage. The module comprises an energy storage device module and a modulation protection module. According to the modulation protection module, linear voltage regulation of a semiconductor switching device and forward voltage drop of a diode are connected in series to form a hybrid modulation circuit, and continuous and dynamic control over the output voltage and the charging current of the energy storage module is jointly achieved. According to the invention, the problem that the existing battery module can only realize on-off control and cannot realize efficient and accurate voltage regulation and constant current is solved, the power processing capability and the system reliability are remarkably improved, and the system can be widely applied to aviation ground power supplies, airborne storage batteries and occasions requiring power buffering.

This utility model discloses a multi-gun DC charging power distribution device, charging pile, and power supply system. It comprises an AC input unit, a charging module group, and a power distribution unit connected in sequence. The power distribution unit includes a positive PDU and a negative PDU, each equipped with a first DC contactor and a second DC contactor. This technical solution adopts a hierarchical architecture of "AC input unit + charging module group + positive / negative PDU," and configures two types of DC contactors with different rated currents (e.g., 600A and 400A) within the PDU according to branch current levels. This allows high-current branches to meet the high-current output requirements of the liquid-cooled guns, while low-current branches can use lower-specification components, significantly reducing contactor material costs and size, minimizing conduction losses, and improving system energy efficiency. Simultaneously, a ring DC bus is introduced to connect each module and each gun in parallel, forming a power-sharing and redundant path. Even in the event of a single module / node failure, the remaining nodes can still continue to supply power.

The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters. The application discloses a high-reliability driving control method and device for a ZVS BUCK converter and the converter, and relates to the technical field of power electronic converters.

The invention discloses a single-phase power electronic voltage regulator, and belongs to the technical field of electric energy regulation. Comprising a parallel compensation circuit, a high-frequency resonance DC-DC circuit and a series compensation circuit, the high-frequency resonance DC-DC circuit is respectively connected with the parallel compensation circuit and the series compensation circuit to form an AC-DC, DC-DC and DC-AC three-stage electric energy conversion structure, and partial power conversion and bidirectional energy flow are realized; the series compensation circuit forms a series compensation power module by a plurality of full-bridge converters, the parallel compensation circuit is a set of single-phase full-bridge inverter, and the high-frequency resonant DC-DC circuit adopts a CLLC resonant topological structure; through the bidirectional transmission channel design of the three-stage AC-DC and DC-AC electric energy conversion structure and the high-frequency resonance DC-DC, compensation energy can be injected into a line when the voltage of the power grid is sag, and excess energy on the load side can be fed back to the power grid when the voltage is sag, so that the functional limitation that part of the existing schemes can only perform unidirectional compensation is solved, and the power grid voltage sag compensation device is suitable for being applied to the power grid. And full-type voltage abnormal working conditions of the power distribution system are adapted.