219 results about "Capacitive discharge" patented technology

The invention relates to the technical field of information, and discloses a fault current suppression method and system for a direct-current deicing device, fault current data of the direct-current deicing device are analyzed through fast Fourier transform, and direct-current bus voltage drop data are obtained based on an analysis result and are processed through a support vector regression algorithm, so that a fault current suppression result is obtained. Obtaining a voltage stress sudden increase trend and further determining stress distribution data of a switching device in the device; processing the stress distribution data by a Kalman filtering algorithm to obtain a processing result so as to determine a dynamic correction coefficient of a bridge arm switching time sequence, and processing the dynamic correction coefficient and element response delay data of the device by a particle swarm optimization algorithm to generate a bridge arm switching time sequence so as to determine a real-time adjustment parameter influencing the discharge rate of a buffer capacitor in the device; and comparing voltage oscillation characteristics before and after matching to determine an impedance compensation value of a commutation path for execution, thereby realizing effective suppression of current oscillation in the DC deicing device.

The invention discloses a charge control method and a digital control system based on a dual-active bridge resonant converter, and belongs to the technical field of dual-active bridge resonant converter control. According to the method, a resettable integrating circuit is used for sampling resonance current and converting the resonance current into integrating voltage which is in a linear relation with charge injection quantity, and an integrating capacitor is discharged and reset before each time of injection; superposing the integral voltage and the ramp voltage; comparing the superposed signal with a threshold voltage output by a current loop through a comparator, and when the superposed signal reaches a threshold value, triggering to generate a PWM signal and switching the working mode of the converter; a switching tube is controlled to act according to a PWM signal, a switching time sequence is dynamically adjusted, effective control over transmission power is achieved, and a digital control system for achieving the method is established. According to the method, rapid dynamic response, efficient power transmission and stable operation of the dual-active bridge resonant converter are realized by controlling resonance current integration and a switching time sequence, and the energy conversion efficiency and the system reliability are effectively improved.

Offline prior to operation, an optimised control sequence is derived for a pulse system comprising a reactive circuit for generating electromagnetic pulses, such as a transcranial magnetic stimulation circuit, and cascaded switching modules for switchably connecting capacitive discharge elements to provide a multi-level output voltage for the reactive circuit. A discrete-time model predicts an electrical state of the pulse system. A target profile for an electromagnetic pulse is received. For respective time-steps of the control sequence taken in succession, an optimal path of switching states over a window of time-steps starting with the respective time-step is derived, optimising a cost function having a deviation cost contribution representing deviation of an electrical state of the pulse system predicted by the discrete-time model from the target profile over the window. The switching state of the determined path at the respective time-step is selected for the control sequence.

The invention discloses a PFC (Power Factor Correction) circuit suitable for electrode high-voltage discharge. The PFC circuit comprises an EMI (Electro-Magnetic Interference) filtering module, a starting protection module, a PFC power conversion module and a PWM (Pulse-Width Modulation) switch type auxiliary power supply module which are connected in sequence. The EMI filtering module realizes bidirectional suppression of interference, and when the circuit is powered off, the bleeder resistor enables the common mode inductor and the differential mode capacitor to rapidly discharge, so that secondary interference is prevented; according to the PWM switch type auxiliary power supply module, a high-voltage area and a low-voltage area are isolated, and it is guaranteed that the power supply input pin of the control chip U2 / U3 can be within the normal working voltage; according to the invention, the control chip U2 limits the PWM duty ratio of the control chip U3 through the control logic, so that overcurrent protection is realized; when the MOS tube Q1 / Q2 is conducted, the resistor R22 consumes energy generated by discharging of the capacitor C21, meanwhile, resonance between the capacitor C21 and the energy storage inductor L2 is restrained, high-frequency electromagnetic interference is prevented, and electromagnetic compatibility of the whole system is achieved.

A wake-up circuit for a charge controller is provided, which includes a first-stage charging circuit and a second-stage charging circuit. The first-stage charging circuit includes a first capacitor. When an input terminal of the first-stage charging circuit receives a high level signal and the first capacitor is in a partially charged state, the first-stage charging circuit charges the first capacitor and outputs a first charging voltage to the second-stage charging circuit. When the input terminal of the first-stage charging circuit receives a low level signal, the first-stage charging circuit discharges the first capacitor. The second-stage charging circuit includes a second capacitor. When the second-stage charging circuit receives the first charging voltage output by the first-stage charging circuit, the second-stage charging circuit charges the second capacitor and outputs a wake-up signal to the charge controller, thereby increasing a scenario coverage of the wake-up circuit to ensure high applicability.

The invention relates to an equipment power failure prompting method based on FPGA capacitor discharge. The method comprises the following steps: acquiring a preset power failure prompt message through an FPGA message cache module based on an equipment interrupt signal; sending a preset power-down prompt message to a neighbor network element through a preset private network management path by using the discharge time window of the energy storage capacitor; and according to an analysis result of the neighbor network element on the preset power failure prompt message, a far-end power failure alarm is generated, the far-end power failure alarm is reported to the private network management server, and the far-end power failure alarm comprises a power failure network element identifier. According to the method, the alarm message is pre-stored through the FPGA, the capacitor discharge time window is utilized, the alarm message is sent to the neighbor network element through the private channel, and the neighbor network element reports the alarm message to the private network manager, so that a power failure event can be quickly positioned, equipment power failure and optical fiber interruption faults are distinguished, the real-time performance and accuracy of power failure alarm are improved, and the power failure alarm efficiency is improved. And an efficient and low-cost power failure fault positioning solution is provided for communication network equipment.

The invention provides a gravity-flywheel-converter device ternary hybrid energy storage system and a smart grid, and the system comprises a gravity energy storage device, a flywheel energy storage device and a power electronic converter device which are electrically connected with the grid. The system further comprises a main controller which is in communication connection with the gravity energy storage device, the flywheel energy storage device, the power electronic conversion device and the power grid, and the main controller is used for controlling discharge of a capacitor in the power electronic conversion device, discharge of the flywheel energy storage device and discharge of the gravity energy storage device under the condition that an emergency instruction sent by the power grid is received. The starting moment of discharging of the flywheel energy storage equipment is before the cut-off moment of discharging of the power electronic converter equipment, and the starting moment of discharging of the gravity energy storage equipment is before the cut-off moment of discharging of the flywheel energy storage equipment. The problem that in the prior art, a single energy storage technology cannot meet the requirement of a novel power system for continuous power support of multiple time scales is solved.

The invention relates to a neural function detection and regulation method and system for a magnetic stimulation coil, and the method comprises the steps: driving a capacitor through a control circuit to discharge to a dual-path stimulation coil, and generating a millisecond pulse magnetic field; utilizing the pulsed magnetic field to act on nervous tissue to generate a nerve regulation effect comprising suprathreshold stimulation and subthreshold stimulation; acquiring evoked potential signals generated by stimulation and induction of the pulsed magnetic field in real time; the evoked potential signal is analyzed, and the nerve conduction time and excitation inhibition ratio is calculated; according to the nerve conduction time and the excitement inhibition ratio, a double-path stimulation time sequence and / or a capacitor discharge parameter are / is adjusted, detection and cooperative regulation and control of the nerve function are carried out, and the purposes of real-time detection, quantitative evaluation and self-adaptive precise regulation and control of the nerve function are achieved.

A system and method for compensating a faulty switch in a multi-level flying capacitor converter includes a converter capacitor arranged in parallel to an input, a first and second converter switches arranged respectively between first and second ends of the converter capacitor, first and second bypass switches respectively arranged in parallel to the first and second converter switches, wherein operation includes detecting a faulty converter level that includes at least one of the first and second converter switches, discharging all capacitors arranged in parallel to the input of the multi-level converter, wherein all capacitors comprise the converter capacitors and an input capacitor; closing the first and second bypass switches of the faulty converter level; adapting a modulation of the converter switches of the other converter levels; and restarting the multi-level converter.

According to the mechanical direct-current circuit breaker based on the variable inductor and the method, in the circuit breaker, a switch branch comprises a vacuum switch VB and a current sensor which are connected in series; the reverse injection branch is connected in parallel to the two ends of the vacuum switch VB, comprises a pre-charging capacitor, a discharging thyristor, a multi-stage series inductor and a parallel thyristor module, and is selectively connected in series with the multi-stage series inductor according to the detected fault current so as to realize variable inductance; a reverse injection current is formed to realize current zero passage and arc quenching of the VB fracture of the vacuum switch; the energy consumption branch is connected in parallel to two ends of the vacuum switch VB and is used for dissipating residual energy in the loop after the mechanical direct current circuit breaker is switched off; the controller is connected with the current sensor and the thyristors and used for judging the number of inductors needing to be input according to the rise rate and amplitude of fault current and controlling the corresponding thyristors to be switched on, and graded inductor series-in and reverse current injection of the multi-stage series inductors of the variable inductor are achieved.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The utility model discloses a low-power-consumption high-efficiency main transformer integrated board for an air-cooled refrigerator, which comprises an X capacitor discharge circuit, a variable-frequency power supply circuit, a bus voltage sampling circuit, a mains supply voltage sampling circuit and an IGBT (Insulated Gate Bipolar Translator) driving circuit, and is characterized in that the X capacitor discharge circuit uses a discharge chip to replace a traditional discharge resistor; the variable-frequency power supply circuit is additionally provided with a variable-frequency power supply switch circuit, the bus and commercial power voltage sampling circuit modifies the resistance value of a divider resistor, and the IGBT driving circuit modifies the resistance value of a resistor. According to the utility model, improvement is made on the basis of a traditional air-cooled refrigerator main transformer integrated plate, the standby power consumption and the operation power consumption of the main transformer integrated plate are reduced, and the low-power-consumption and high-efficiency electric control design is realized.

The invention discloses a current control type charge pump circuit with fixed voltage output and a charge pump system, and relates to the technical field of charge pumps. The circuit comprises a charge pump module which is used for charging a floating capacitor in the charge pump module by using a preset voltage source and an adjustable charge pump current source module in a charging time sequence and discharging the floating capacitor in a discharging time sequence to obtain an output voltage of the charge pump module; the error signal generation module is used for obtaining an error voltage signal according to the input voltage and the output voltage of the charge pump module; the current signal generation module is used for compensating a current signal for controlling the adjustable charge pump current source module according to the error voltage signal to obtain a compensated current signal; and the adjustable charge pump current source module is used for controlling the charging current intensity when the charge pump module charges the floating capacitor under the control of the current signal so as to realize fixed voltage output.

The invention relates to the technical field of energy storage configuration, in particular to a network construction type SVG super capacitor configuration method, system and device based on a direct current side direct-hanging super capacitor and a storage medium. Acquiring grid-connected voltage, target instantaneous active power and continuous discharge time; selecting the specification of a super capacitor monomer, determining a single cluster rated voltage and setting a branch current-limiting threshold value; establishing a single-cluster supercapacitor discharge model, simulating a process from constant-power discharge to a current-limiting threshold value, considering the influence of internal resistance voltage division, calculating single-cluster release energy through power-time integration, and obtaining single-cluster constant discharge power; calculating the number of super capacitor clusters; the number of parallel branches and the number of series clusters are determined by combining the topological direct-current side voltage range of the MMC, and the direct-current side rated voltage is set. By establishing a discharge model considering internal resistance voltage division, accurately calculating the actual discharge capacity of a single cluster, and systematically planning super capacitor configuration in combination with MMC topological characteristics, the problems that an existing method is insufficient in configuration precision and lack of topological adaptability are solved, and the reliability of a network-forming SVG is improved.

The invention relates to the field of feedback type automatic gain control circuits, and discloses a fully differential peak detection AGC circuit, which comprises a multi-stage variable gain amplifier, a buffer amplifier group, a first comparator EA1, a fully differential peak detection unit and an external port, the external port comprises a power supply end VDD, a ground end GND, a negative signal input end INN, a positive signal input end INP, a positive signal output end VON, a negative signal output end VOP, a plurality of bias ports and a reference voltage end VREF; according to the full-differential peak detection circuit, the full-differential structural design is adopted, common-mode noise and external interference can be effectively restrained, the full-differential peak detection unit alternately discharges the capacitor C11 through the first NMOS tube NM1 and the second NMOS tube NM2, continuous discharge adjustment of the capacitor C11 is achieved, the problem that discharge of the capacitor is interrupted in traditional peak detection is avoided, the loop response speed and the gain adjustment precision are improved, and the detection precision of the full-differential peak detection circuit is improved. Even if one path of the differential signals is temporarily lost, the other path of the differential signals can still drive the peak detection unit and the feedback loop to work, and the reliability is improved.

The application provides a starting control device for nuclear safety class diesel engine double-motor starting, which comprises a main motor M1 and a standby motor M2, an intermediate relay K002, a pulse relay K003, an intermediate relay K004, a main repeated starting relay K01 and a secondary repeated starting relay K02. The application can realize the sequential switching of the main motor and the standby motor by only repeatedly sending a starting signal of a diesel engine control system, and can realize the repeated starting function and avoid the meshing failure of an output gear through the discharge of a capacitor to realize control and time delay.

A method and system for manufacturing an RFID device involve positioning a first conductive member relative to a second conductive member and temporarily securing them together. A localized temperature increase is created at an interface between the conductive members, forming a galvanic connection at a localized weld zone. The method may include applying pressure during heating and can use various heating techniques such as inductive, capacitive discharge, or laser heating. The system includes a transporter, a positioner, and an energy applicator. An RFID device manufactured by this method comprises a first conductive member, a second conductive member, and a galvanic connection between them, with the connection having a localized weld zone exhibiting distinct structural characteristics. The method and system may improve electrical connectivity in RFID devices, particularly between RFID straps and antennas.

This invention discloses a low-voltage pre-calibrated single-current sampling DBD equivalent parameter measurement method and system. Addressing the core shortcomings of existing DBD parameter measurement technologies, such as complex hardware, significant safety hazards from high-voltage sampling, inherent errors introduced by measurement capacitors, and imprecise derivations of single-current sampling schemes, this invention employs a two-step method to achieve full parameter measurement using only single-channel current sampling: First, pre-calibration is performed under low-voltage, undischarged conditions to obtain the DBD series equivalent capacitance and the initial phase of the excitation voltage; then, the circuit current is sampled under normal discharge conditions, and the discharge / undischarge interval is accurately divided using the sliding window variance method. Based on the data from the undischarged interval, a complete excitation voltage waveform is fitted, and finally, all equivalent parameters, including dielectric capacitance, air gap capacitance, discharge sustaining voltage, and discharge power, are calculated. This invention eliminates the need for additional hardware such as high-voltage probes and measurement capacitors, enabling online measurement of equivalent parameters.

The invention provides a bidirectional balancing method between capacitive battery packs, which is characterized in that two capacitors are arranged between two batteries, and when one capacitor is charged, the other capacitor is discharged, so that one capacitor is always in a charging state and the other capacitor is in a discharging state in a charging and discharging period of the capacitors. The invention also provides a bidirectional equalization circuit between the capacitive battery packs and a BMS (Battery Management System).

The invention discloses a direct-current ship power grid fault flexible ride-through method based on zero-sequence current injection, which belongs to the technical field of direct-current ship power grid fault protection, and comprises the following steps: when a switch fault is detected, positioning the position of a fault switch; calculating the degree of asymmetry of the direct-current voltage according to the output voltage requirement of the inverter; the direct-current voltage asymmetry degree serves as input, the rectifier is controlled through carrier amplitude modulation and zero-sequence component injection, and asymmetric direct-current voltage is output; the method comprises the following steps of: determining locking and conducting switches when different switch faults occur, and controlling an inverter to realize generation of separated alternating-current phase voltage and optimal zero-sequence component injection through two-level carrier modulation according to asymmetric direct-current voltage so as to complete flexible fault ride-through of the frequency converter. By adopting the method, the processes of capacitor discharge, energy feedback and the like in the fault period are adjusted through the control factors, system instability and equipment reverse rotation are prevented, and continuous power supply and operation safety of a ship power grid are guaranteed.

The invention relates to an ignition circuit, in particular to a double-cylinder combined type ignition circuit and an igniter. Comprising a module connector and a plurality of charging and discharging circuits connected with the module connector, the charging and discharging circuit comprises a control circuit, a power switch circuit and a discharging trigger circuit which are connected with the module connector, and a charging circuit and a discharging circuit which are respectively connected with the power switch circuit and the discharging trigger circuit, and the discharging circuit is connected with the charging circuit and the spark plug; the control circuit receives an ignition driving signal and controls the power switch circuit to boost the power supply voltage, and the boosted power supply voltage charges the charging circuit; the discharge trigger circuit receives the ignition driving signal and controls the discharge circuit to supply power to the spark plug. According to the double-cylinder composite ignition circuit provided by the invention, low input voltage (DC12V) is realized, the single-path ignition energy can reach 120mJ, the requirements of an engine under specific working conditions can be met, and the defect that the discharge ignition energy of a traditional capacitor is small is overcome.

The invention discloses a short-circuit current calculation method for an electric-electric hybrid ship direct-current integrated power system, which comprises the following steps of: respectively carrying out interelectrode short-circuit current analysis calculation on synchronous rectification generators to obtain generator short-circuit current; filter capacitor discharge current analytic calculation is carried out on the DC / DC converters respectively, and transient discharge current is obtained; analyzing and calculating the steady-state short-circuit current output by the lithium battery through the DC / DC converter to obtain the steady-state short-circuit current; and adding the results to obtain the short-circuit current of the system. Compared with electromagnetic transient simulation calculation, the calculation speed is higher, and the calculation result error meets the allowable deviation range of engineering calculation. The method can provide support for protection design and short-circuit safety check of an electricity-electricity hybrid ship direct-current integrated power system powered by a synchronous rectification generator set and lithium battery energy storage in parallel, and can be applied to ship integrated power system application scenes such as harbors as tugs and offshore large transport ships.

This invention discloses a hydrogen-based electrical discharge machining (EDM) system, relating to the field of EDM. The system includes: a contact detection system for detecting the contact state between the electrode and the workpiece and outputting the contact detection signal to the machining control system; a detection switching system for switching between machining and detection modes, receiving switching commands from the machining control system, and connecting the electrode and workpiece to either the contact detection system or the EDM system; and a pulse voltage system for providing low-voltage pulse discharge energy. Compared with existing technologies, the advantages of this invention are: by comprehensively utilizing a special mechanical structure of a dual-slide stage, a rapid switching circuit, hydrogen as a reducing working medium, and low-voltage pulse capacitor discharge technology, this invention systematically solves the four inherent bottlenecks of traditional gas EDM: high voltage dependence, surface oxidation and degradation, servo return error, and process monitoring lag. Ultimately, it achieves high-precision, high-quality, high-efficiency, and inherently safe precision EDM.

The invention discloses a silicon carbide device state detection circuit based on threshold voltage change, relates to the technical field of power electronics, and aims at online threshold voltage extraction and state evaluation of a SiC power device. The circuit takes a half-bridge structure as a carrier, an integral voltage is formed at a lower tube integral node through transconductance operational amplifier integration of a lower tube gate-source voltage, and voltage jump of a half-bridge midpoint node is converted into a comparator overturning signal of a drain-source event detection node through a high-voltage diode and a current-limiting resistor; and an integral time window is limited and a reset switch MOS tube is triggered to discharge and reset the integral capacitor, so that an integral voltage peak value and event time delay are obtained. The control unit only collects two variables of the event time delay and the integral voltage peak value, gating is carried out according to the calibrated consistency relation, output abnormity types are subdivided, effective measurement screening, false triggering and integral / reset abnormity diagnosis and threshold voltage drift statistics are achieved, and the stability and engineering availability of online detection are improved.

The embodiment of the invention discloses a bootstrap capacitor charging method, which is applied to an asymmetric half-bridge converter comprising a primary side upper tube and a primary side lower tube, and comprises the following steps: when the asymmetric half-bridge converter exits from a burst mode, judging whether the duration of the asymmetric half-bridge converter in the burst mode is greater than a preset time threshold; if the duration time is greater than a preset time threshold value, executing a bootstrap capacitor charging stage by controlling a primary side lower tube until a first preset condition is met; after the bootstrap capacitor charging stage is finished, a primary side upper tube is controlled to execute a resonant capacitor discharging stage until a second preset condition is met; and if the duration time is not greater than the preset time threshold value, or after the discharge stage of the resonant capacitor is ended, enabling the asymmetric half-bridge converter to enter a closed-loop control mode. According to the embodiment of the invention, large current impact caused by overhigh voltage of the resonant capacitor is avoided, the current stress of the asymmetric half-bridge converter is effectively reduced, the noise is reduced, and the stability is improved.

The application provides a controller of an active clamp flyback conversion circuit, a power module and an electronic device. After the active clamp flyback conversion circuit operates in a suspended working state, the controller controls the discharge of a resonance capacitor of the active clamp flyback conversion circuit, so that the voltage value of the output voltage of the power circuit is higher than the preset voltage value of the low-voltage protection of the controller, thereby avoiding the restart of the controller due to the low-voltage protection, and improving the stability of the power module and the electronic device in which the active clamp flyback conversion circuit is located. Moreover, when the controller controls the discharge of the resonance capacitor, the output voltage ripple of the active clamp flyback conversion circuit is not increased, and noise from the input power is not introduced.

The invention discloses a pre-current-limiting hybrid direct current circuit breaker based on an inductive coupling principle and a control method. The pre-current-limiting hybrid direct current circuit breaker comprises a main branch and an auxiliary branch which are connected in parallel, the auxiliary branch comprises a bridge type reversing branch composed of thyristors and diode valve groups Q1-Q4, a current transfer branch, a bypass branch, a current limiting part, a self-charging part and an energy consumption branch are arranged in the bridge type reversing branch, and energy release branches composed of common mechanical switches and resistors are arranged at the two ends of a capacitor C1 and the two ends of a capacitor C2 respectively. The energy release branch is used for discharging the corresponding capacitor after the circuit breaker acts; the bypass branch, the current limiting part and the self-charging part are connected in parallel and then are connected in series with the energy consumption branch to form a series unit; the MMC flexible DC power grid circuit is small in on-state loss, low in cost, high in reliability, capable of being flexibly adapted to different abnormal scenes of a DC system, and suitable for the fields of MMC flexible DC power grids and the like.

An inverter assembly including a phase-control chamber and a direct current (DC) chamber. The phase-control chamber includes a direct current (DC) link capacitor electrically connected a control circuit board via multiple connectors. The DC chamber includes a ferrite filter fixed to a DC bus bar via a support component.

This invention discloses a frequency dithering control circuit, a control chip, and a switching power supply. The frequency dithering control circuit includes: a narrow pulse generation module, used to convert an input high-level enable signal into a low-level narrow pulse after the control chip is started; a current source charging and discharging module, used to charge a capacitor connected to a pin of the control chip when a low-level narrow pulse is received, and simultaneously output a first voltage signal based on the voltage signal detected at its detection terminal; and to discharge the capacitor when no low-level narrow pulse is received at its input terminal; a level shifting module, used to convert the first voltage signal into a second voltage signal, either the supply voltage or ground level, and then output it; and a frequency dithering switch module, used to control the conduction and cutoff of the transmission gate based on the second voltage signal, the narrow pulse, and the enable signal, thereby enabling and disabling the frequency dithering function of the control chip. This invention reduces the design difficulty for application engineers.

The utility model discloses a sorting trolley power supply system depending on intermediate frequency power supply and capacitor power supply, which comprises a cross-belt sorting machine, a plurality of sorting trolleys are arranged on the cross-belt sorting machine, and the plurality of sorting trolleys circularly move on a track of the cross-belt sorting machine depending on a linear motor; the sorting trolleys are electric sorting trolleys, the sorting trolleys are powered by an intermediate-frequency power supply device, and the power of the intermediate-frequency power supply device is larger than that of one sorting trolley but smaller than the sum of the power of all the sorting trolleys; the sorting device further comprises at least one medium-frequency power supply picker and at least one capacitor, the capacitor is connected in a power supply loop of the medium-frequency power supply device and the sorting trolleys in parallel, the medium-frequency power supply picker charges the capacitor, and when the sorting trolleys need to act, the capacitor discharges to drive the sorting trolleys to act. According to the utility model, the power of the intermediate-frequency power supply device is reduced, the energy consumption is reduced, and the manufacturing cost and the operation cost are further reduced.