109 results about "Pulse charge" patented technology

The invention discloses a cable GIS terminal stress-strain sensor and a strain monitoring method thereof, and belongs to the technical field of stress-strain monitoring, and the sensor comprises a sensor structure unit which comprises a metal housing, a fixed contact, a movable contact and a piezoelectric element; the signal processing unit is integrated in the integrated circuit shell and comprises a charge collector used for converting a charge signal of the piezoelectric element into an analog voltage signal; the pulse charge discharger is connected to the output end of the charge collector in parallel; the analog-to-digital converter is connected with the output end of the charge collector and is used for converting the analog voltage signal into a digital signal; the serial communication interface is used for outputting digital signals after analog-to-digital conversion; the mounting unit comprises a fixing hole position and an adhesive base which are arranged on the metal shell; the cable GIS terminal stress strain monitoring device is used for monitoring the stress strain of the cable GIS terminal in the operation process so as to reflect typical structure defects appearing in the cable GIS terminal, and online monitoring of the cable GIS terminal equipment is achieved.

The invention discloses a battery formation method, a battery and an electric device, and belongs to the technical field of batteries. According to the method, a battery is soaked and pre-charged in sequence, then pulse charging is performed on the battery during charging, and ultrasonic treatment and continuous air exhaust are performed on the battery while pulse charging is performed. And after charging is finished, carrying out shelving treatment and aging treatment to finish formation. Charging is carried out under the multi-physical field synergistic effect of an ultrasonic wave field formed by ultrasound, a pulse electromagnetic field formed by pulse charging and a negative pressure field formed by air exhaust, the quality of an SEI film can be improved, polarization is reduced, and the cycle performance of the battery is improved.

The present application relates to a lithium-plating-risk determination method and apparatus for vehicle-side battery cells, and a device, a storage medium and a product. The method comprises: firstly determining the current pulse charge / discharge operating condition on the basis of a pulse charge / discharge request; then, acquiring an SOC dataset and a voltage dataset of a vehicle-side battery cell under the current pulse charge / discharge operating condition; if SOC data within a lithium-plating-risk SOC interval is present in the SOC dataset, further acquiring voltage data corresponding to the SOC data; and if the voltage data exceeds a critical lithium-plating-risk voltage, determining that the vehicle-side battery cell has a high lithium plating risk.

The invention discloses a power battery parameter identification method and device, electronic equipment, a storage medium and a product. The power battery parameter identification method comprises the following steps: establishing an external characteristic equation of a power battery second-order RC equivalent circuit model; the method comprises the following steps of: calculating ohmic internal resistance under each preset residual electric quantity value by utilizing experimental data of a discharging stage and a shelving stage in a mixed pulse charging and discharging HPPC experiment, and identifying other battery parameters except the ohmic internal resistance in an external characteristic equation of a second-order RC equivalent circuit model of the power battery; obtaining other battery parameter data corresponding to the plurality of preset residual electric quantity values; and based on the ohmic internal resistance and other battery parameter data, using an interpolation method to expand an optimal parameter corresponding to the second-order RC equivalent circuit model of the power battery under the preset residual electric quantity value. According to the method, the battery parameters under different working conditions are identified, the identification precision of the battery parameters is improved, and the identification efficiency is improved.

The invention discloses a retired battery parameter identification method, and relates to the technical field of lithium ion battery management, and the method comprises the steps: carrying out the pulse charging and discharging test of a retired lithium ion battery, obtaining a relaxation voltage sequence, carrying out the smoothing preprocessing of the relaxation voltage sequence, constructing a candidate cut-off termination time set in a relaxation time interval, and carrying out the calculation of the candidate cut-off termination time set. And intercepting corresponding relaxation data for each truncation termination time, performing parameter fitting based on the second-order equivalent circuit model, calculating a root-mean-square error at each truncation termination time, and selecting a parameter group with the minimum error as a target equivalent circuit parameter. By selecting and modeling a data fitting interval as a root-mean-square error minimization problem, automatic adaptive identification of the equivalent circuit parameters of the decommissioned battery is realized, the difficulty of selecting an E point under a fixed window is solved, the robustness and physical consistency of a parameter identification result are improved, a model prediction error is remarkably reduced, and the generalization ability under multiple working conditions is improved.

The invention relates to the technical field of battery detection, in particular to an open-circuit voltage fitting method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining test data obtained through the pulse charging and discharging test of a battery; according to the test data, a first model parameter in a target fitting model is assigned, in the target fitting model, a battery end voltage is equal to the superposition of an ohm voltage drop, a charge transfer polarization voltage drop, a diffusion polarization voltage drop and an open-circuit voltage, and a second model parameter in the target fitting model is assigned; the first model parameters comprise ohmic impedance in the ohmic voltage drop, reaction impedance in the charge transfer polarization voltage drop and diffusion impedance in the diffusion polarization voltage drop; and on the basis of the target fitting model, open-circuit voltages of the battery in different charge states are obtained, and the different charge states correspond to different battery terminal voltages. Therefore, the estimation speed of the open-circuit voltage and the prediction accuracy of the open-circuit voltage are improved by adopting a pulse charging and discharging test and model fitting mode.

This invention discloses an adaptive charging method for nickel-metal hydride batteries based on pulse modulation. By simultaneously sampling the temperature at multiple characteristic locations on the battery surface and calculating the average temperature, thermal field standard deviation, and maximum battery temperature, a comprehensive quantitative perception of the overall and local thermal state of the battery is achieved, overcoming the limitations of single-point temperature measurement and accurately identifying local thermal risks. By comparing the thermal field standard deviation with a thermal field imbalance threshold and switching the charging control mode based on the comparison result, combined with a differentiated duty cycle adjustment strategy matched to the charging control mode, adaptive control of charging parameters is achieved, balancing charging efficiency when the thermal field is uniform and suppressing local hot spots when the thermal field is unbalanced. By simultaneously monitoring the real-time battery voltage, maximum battery temperature, and cumulative charging time, and immediately stopping pulse charging when a set threshold is reached, a triple safety protection mechanism is constructed, mitigating overcharging and overheating risks from multiple dimensions and significantly improving the safety and reliability of the charging process.

A charging method is provided, which includes: acquiring a state parameter of a traction battery, the state parameter including a battery temperature; sending first charging mode demand information to a charging pile when the battery temperature is lower than a first preset threshold, where the first charging mode demand information is used for indicating a pulse charging mode, the pulse charging mode is a charging mode using a pulsed voltage or a pulsed current, and the pulsed voltage or the pulsed current is used for charging the traction battery. According to the technical solution of the embodiment of the application, the charging pile can output pulse current to charge the traction battery, so as to prevent the performance of the traction battery from being affected by directly charging the traction battery at a low temperature, thereby ensuring the performance of the traction battery.

The utility model relates to the technical field of medical equipment, and particularly discloses a bipolar nanosecond pulse synchronous output circuit and ablation equipment, which comprise a positive pulse output circuit and a negative pulse output circuit, the positive pulse output circuit comprises a positive pulse charging unit, a positive pulse output control unit, a positive pulse transmission unit and a positive pulse output electrode wire which are electrically connected in sequence; the negative pulse output circuit comprises a negative pulse charging unit, a negative pulse output control unit, a negative pulse transmission unit and a negative pulse output electrode wire which are electrically connected in sequence; the positive pulse transmission unit at least comprises a forward multiplication transmission unit which is used for performing forward voltage multiplication or forward current multiplication on the forward output pulse signal; the negative pulse transmission unit at least comprises a negative multiplication transmission unit which is used for carrying out negative voltage multiplication or negative current multiplication on the negative output pulse signal. The bipolar nanosecond pulse synchronous output circuit provided by the utility model can improve instant pulse energy of nanosecond pulse tumor ablation equipment.

The disclosure relates to a battery system. The battery system comprises a first battery cell unit and a second battery cell unit, each one comprising a respective current regulator arrangement configured to control charging of a respective battery cell unit. The battery system further comprises a control arrangement. The control arrangement is configured to selectively control charging of the first and second battery cell units, by controlling the current regulator arrangement of the first battery cell unit to charge the first battery cell unit, and simultaneously by controlling the current regulator arrangement of the second battery cell unit to heat said second battery cell unit. The heating is performed by a pulsed charging cycle, preferably wherein the pulsed charging cycle is delivered by pulses having a frequency of 1 Hz – 1 MHz, preferably 10 Hz – 100 kHz. The disclosure further relates to a computer program and a computer-readable medium.

The application discloses a kind of construction methods of power battery system power simulation model, belong to power battery simulation technical field, this method includes: selecting the three kinds of sample monomer battery with lowest, highest and mean value internal resistance;Equivalent circuit model corresponding to unit is constructed based on the characteristic parameters of sample monomer battery;Unit equivalent circuit model is expanded to the battery module equivalent circuit model for characterizing corresponding battery group, and battery module equivalent circuit model is connected in series to form system level equivalent circuit model;The basic parameters, quality and thermal management scheme of monomer battery are combined to construct the thermal management model corresponding to each battery module;System level equivalent circuit model, each thermal management model and pulse charge-discharge condition model are thermoelectric coupling, and power simulation model is obtained.The application is equivalent to modeling by representative sample, and the influence of battery consistency difference on system power is truly reflected, and the problem of large amount of calculation and insufficient precision of traditional modeling is solved.

The invention relates to a rapid charge supply device for spacecraft pulse charge emission, and belongs to the field of space charging and discharging. The bottom plate is of a plate-shaped structure which is horizontally arranged in the axial direction; the cathode is of a cylindrical structure; the cathodes are in coaxial butt joint; the anode is of a cylinder structure; the anode is coaxially arranged in the inner cavity of the cathode; the root of the anode is butted with the bottom plate; the working medium sleeves the outer wall of the middle part of the anode and is filled between the cathode and the anode; the spring is sleeved on the outer wall of the anode root; one end of the spring is contacted with the bottom plate; one end of the spring contacts with the working medium end face; the insulating assembly is arranged at the opening of the axial head end of the cathode; two poles of the energy compression module are respectively connected with the cathode and the anode; the power supply is connected with the energy compression module to charge the energy compression module; a charge self-consistent cavity is formed on the outer side of the opening of the axial head end of the cathode; when the device is used for spacecraft pulse charge beam output, rapid supply in the pulse is achieved, and the spacecraft is kept electrically neutral in real time.

The utility model relates to the technical field of power supply equipment, in particular to a projector power supply structure, which comprises an adjusting module, a voltage monitoring module, a pulse charging module, a charging management module and a storage battery. The input end of the adjusting module is connected with the commercial power input interface. The voltage monitoring module is connected with the storage battery and used for detecting the electric quantity of the battery in real time to obtain the current electric quantity of the storage battery. The input end of the pulse charging module is connected with the output end of the adjusting module, and the output end of the pulse charging module is connected with the storage battery. The charging management module is connected with the voltage monitoring module and controls the charging mode of the pulse charging module based on the current electric quantity of the storage battery, so that the storage battery can be protected. The storage battery is connected with an external load through the power conversion module. The pulse charging module can shorten the charging time of the storage battery, can effectively protect the storage battery from being overheated due to overcharging, and prolongs the service life of the storage battery.

The application relates to the field of household appliances and provides an air conditioner indoor and outdoor unit communication method and device, the method comprising the following steps: determining whether the outdoor unit is in a low standby state; based on the outdoor unit being in the low standby state, performing pulse charging on the outdoor unit; determining whether a monitoring time delay in the pulse charging process is greater than a preset threshold value, and based on the monitoring time delay being greater than the preset threshold value, adjusting a charging pulse time by using the monitoring time delay, and performing pulse charging on the outdoor unit according to the adjusted charging pulse time, so as to maintain normal communication of the outdoor unit. The application solves the defects that the communication rate of strong current loop communication is slow and cannot be applied to large data transmission, maintains normal communication of the outdoor unit in a low standby mode, improves the communication rate, and reduces the design cost.

The present invention discloses a battery self-discharge characteristic testing method, a battery self-discharge characteristic testing device, a battery self-discharge characteristic testing equipment, and a computer-readable storage medium, belonging to the technical field of battery testing. By performing two identical pulse charges on a battery to be tested in a static stable state and then allowing it to stand, the voltage change over time of the battery to be tested during the two pulse charging processes is determined. Based on the voltage change over time, the average self-discharge current of the battery to be tested when it is at rest after the first pulse charging is further determined, and the self-discharge characteristics of the battery to be tested are characterized by the average self-discharge current. Based on the precise voltage sampling during the two pulse charging and standing processes, the self-discharge current during the battery self-discharge process and the irrecoverable and recoverable self-discharge currents are evaluated, and the battery self-discharge characteristics obtained by the test are accurate and reliable.

The invention discloses a triggering system for triggering a gas switch based on a linear photoconductive switch, and aims to solve the problems of instability, short service life, low compactness and the like of an existing triggering system. The device is composed of a high-voltage direct-current source, a charging resistor, a charging isolation inductor, a thyristor, a pulse charging source, a gas switch, a photoconductive switch, a current-limiting resistor, a reverse inductor, a control loop and a load. The pulse charging source comprises an energy storage capacitor, a thyristor, a pulse transformer and a pulse forming line. The control loop is composed of a digital delay generator and a trigger light path. The trigger light path is composed of a laser, a beam expander, an iris diaphragm, a beam splitter and an attenuation piece according to the light path of the pulse laser. The positive electrode end of the photoconductive switch is connected with the high-voltage electrode of the gas switch, bias voltage is directly obtained through coupling of the high-voltage electrode of the gas switch in a capacitive voltage dividing mode, a high-voltage bias power source is omitted, compactness and stability are good, the service life is prolonged, and reliability is improved.

The invention discloses a charging pile power grid harmonic collaborative suppression method based on an aged battery, and the method comprises the steps: switching a constant current-constant voltage mode into a multi-band pulse charging mode after the aging state of the battery is detected, constructing a pulse charging parameter dynamic adjustment mechanism, and carrying out the reactive compensation control at a constant voltage stage, spectral analysis and sensitive frequency band shielding processing are carried out on the harmonic content of the charging current, so that the purposes of reducing harmonic interference, slowing down peak load impact of a power grid and maintaining a relatively high power factor under the condition of battery performance degradation are achieved; therefore, the technical effects of improving the power quality of a power grid, enhancing the safe charging capacity of the aged battery and prolonging the service life of the battery are achieved, and the technical problems that when the health degree of the battery is reduced, power grid harmonic pollution, power factor degradation, serious system voltage fluctuation and the like are easily generated in the charging process are solved.

The present application relates to the technical field of aluminum electrolytic capacitor, in particular to a pulse aging method and a pulse aging system for high-voltage aluminum electrolytic capacitor; the pulse aging is a multiple pulse boosting-discharging cycle process; the cycle process of one pulse boosting-discharging is: first, pulse boosting and charging at the same time with a charging voltage and a charging current, maintaining high-voltage charging state after charging; then, pulse discharging and boosting at the same time with a discharging voltage and a discharging current, maintaining low-voltage discharging state after discharging; by setting pulse charging-discharging voltage, current density, cycle number and other parameters, the rejection rate of latent defect capacitor can be significantly improved, and the leakage current of the capacitor can be additionally reduced by at least 25%; the present application provides a quantifiable process scheme for efficient and high-reliability aging screening of high-voltage aluminum electrolytic capacitor.

The present application relates to a kind of formation method of negative electrode-free lithium metal battery, belong to the method or device technical field for directly converting chemical energy into electrical energy.The formation method of negative electrode-free lithium metal battery of the present application includes the following steps: S1, the cell is placed at temperature T0 Rest, rest time is t0;S2, without applying pressure to the cell, at temperature T0 With current density I0 To the cell is pulsed charged for total duration t1;S3, the temperature of the cell is restored to room temperature;S4, at pressure P1, temperature T1 To the cell is charged and discharged cycle;S5, at pressure P2, 25 ℃ To the cell is charged and discharged cycle;Wherein, -15 ℃≤T0<25 ℃, I0≤2.2C, P1≤2.2N / m, P2≤P1, T1≥30 ℃.The formation method can improve the cycle performance of negative electrode-free lithium metal battery.

An image sensor is disclosed. The image sensor may include a plurality of sensing nodes electrically connected to at least one circuit of the circuits, the sensing nodes formed on the first side of a silicon layer adjacent to the circuits. Each sensing node may include a floating diffusion structure connected to one of at least one channel of the circuits and an output circuit. Each sensing node may include a charge reset structure configured to remove a charge from the floating diffusion structure. Each sensing node may include a noise-cancellation gate electrode adjacent to the floating diffusion structure and configured to be driven by a noise-cancellation signal. The image sensor may include a resistive gate electrode configured for at least one of direct current or non-pulsed signals. A charge reset structure of each sensing node may be driven with a voltage following a sinusoidal waveform.

The present application relates to the field of two-wheel electric vehicle charging, and particularly relates to a dynamic power regulation method and system for two-wheel electric vehicle super-charging piles. The method comprises: obtaining the maximum available power of a power distribution network and collecting vehicle battery and service state data, calculating the charging urgency weight and distributing high-frequency pulse charging parameters, phase-shifting and staggering the pulse on and off time to limit the actual total power with the maximum available power as a constraint, and calculating the battery polarization degree in combination with the open circuit voltage during the zero current period of pulse off, dynamically correcting the pulse parameters based on the polarization degree and cyclically executing the scheduling. The present application improves the traditional logic of single power distribution, fuses service and battery data to ensure that emergency distribution has priority to obtain charging resources, avoids concurrent super-charging tripping risk by staggered scheduling, and effectively suppresses concentration polarization and protects the safety of underlying batteries through polarization closed-loop monitoring.

The application discloses a kind of anti-static dust removal mechanisms for liquid crystal display screen production, belong to display panel manufacturing field.The mechanism is sequentially arranged pre-charging suspension zone, standing wave excitation stripping zone and zero potential negative pressure recovery zone along the direction of conveyance.Pre-charging suspension zone utilizes detection probe to identify electrostatic polarity, and makes microdust into electrostatic suspension state by same polarity charging component emitting transient high-voltage pulse charge, and is equipped with the flexible edge grounding component of synchronous linkage to provide charge discharge loop;Standing wave excitation stripping zone utilizes high-frequency alternating air valve drive to set micro-gap air knife of face-to-face, forms spatial oscillation pressure field with preset phase difference above panel, and directly acts on suspended microdust by generated vertical acoustic streaming excitation force and strips it;Finally, by negative pressure recovery zone, microdust is recycled and potential is zeroed.The application is coupled by electrostatic body force repulsion and aerodynamic vertical excitation force in time sequence rigidity, significantly improves the removal rate of submicron microdust, effectively prevents TFT array from being punctured.

Embodiments that provide advanced charging of energy source arrangements for energy storage applications are disclosed. The embodiments can include the application of pulses to an energy source for charging and preheating purposes. Systems and techniques for assessing parameters of impedance, inductance, and thermal characteristics for use in heating and charging are described, as are feedback based pulse control embodiments that assess voltage changes due to concentration shifts.

The application discloses a warehouse-in-adaptive pulse charging control method and system applied to a shared power bank, and the method generates and acquires first trigger data corresponding to the shared power bank, creates and generates first data corresponding to the shared power bank based on the first trigger data, constructs and generates second data corresponding to the shared power bank based on the first data, establishes and generates third data corresponding to the second data according to the second data, dynamically adjusts pulse charging parameter data according to the third data, and generates fourth data corresponding to the shared power bank in real time, wherein the fourth data is charging completion prompt data, the method can realize personalized and refined charging management of power banks in different health states, thereby prolonging the overall service life of the battery, improving the safety and efficiency of the charging process, and having online battery health diagnosis capability.

The application discloses a power battery charging device and a pulse charging method. The power battery charging device is used for multiplexing the circuit structure of an existing motor controller in a vehicle. The power battery charging device comprises four main connection ports. Two of the four main connection ports are used for connecting the positive and negative poles of a charging pile, and the other two of the four main connection ports are used for connecting the positive and negative poles of a power battery. The power circuit in the motor controller is used for converting the electric energy output by the direct-current charging pile into pulse current. Therefore, the hardware investment cost is reduced, the power battery is subjected to efficient pulse charging, and the service life of the power battery is effectively prolonged.

The utility model relates to the technical field of high-voltage pulse generating devices, in particular to a low-power high-low voltage isolation pulse generating device. Comprising a signal generator U1, a first 5V low-voltage side power supply end VCC, a first low-voltage side reference ground end GND, an optical coupling load resistor R2, an optical coupling isolation switch U2, a second 5V low-voltage side power supply end VCC, a high-voltage side power supply end HV, a pulse input current-limiting resistor R1, an optical coupling isolation switch U3, a second low-voltage side reference ground end GND, a pulse charging capacitor C1 and a pulse output current-limiting resistor R3. According to the low-power high-low voltage isolation pulse generation device, the topological structures of the signal generator U1, the optical coupling isolation switch U2 and the optical coupling isolation switch U3 are arranged and work in a coordinated manner, so that effective isolation of high-low voltage circuits and accurate control of pulse signals are realized, the hardware structure is simplified, the test function is powerful, and the test efficiency is improved. The method can be widely applied to high and low voltage isolation test and performance verification of a control system.

The invention relates to the technical field of breakdown voltage testing, in particular to an inflatable lightning impulse high-voltage generator which comprises a tank body, a high-voltage generator installed in the tank body through an insulating support and a balancing device used for ventilation and pressure balancing, and the high-voltage generator is used for charging and discharging in an external pulse mode; the balancing device comprises a balancing air bag and a constant-pressure container, the balancing air bag is communicated with the interior of the tank body and is in a contraction state, the constant-pressure container is arranged in the tank body, the balancing air bag is located in the constant-pressure container, and the constant-pressure container is communicated with a plurality of pressurizing assemblies which face the constant-pressure container and pressurize the constant-pressure container through volume elastic expansion and contraction; the volume expansion pressure of the balance air bag is larger than the preset pressure of the tank body and smaller than the peak pressure of the tank body after discharging. According to the invention, the pressure is maintained through the carbon expansion of the balance air bag within a certain pressure range, and the SF6 or SF6 / N2 mixed gas in the gaps of the small balls is replaced, so that the insulation performance of the SF6 or SF6 / N2 mixed gas after discharging is optimized, and the influence of the fluctuation of the test voltage on the test result is reduced.

The present application relates to the technical field of battery power, in particular to a kind of unmanned aerial vehicle countermeasure gun battery power display method and system based on coulomb meter, including the battery pulse current is collected by electromagnetic shielding type coulomb meter, based on pulse rising edge triggers dynamic variable sampling rate mechanism, generates pulse charge quantity;The pulse charge quantity is input into eddy current-temperature joint compensation module, in combination with gun body surface magnetic field intensity data and battery temperature data, output correction charge quantity;The correction charge quantity is input into nonlinear capacity mapping model, calculate effective charge total amount, according to battery aging coefficient is converted into final residual power and drives display unit.The present application introduces the dynamic variable sampling mechanism triggered by pulse rising edge, significantly improves the collection accuracy and timing response capability of high-speed pulse current, solves the problem of large integral error of traditional fixed-frequency sampling in strong dynamic scene, cooperates with edge compensation algorithm, can effectively restore the charge omission caused by trigger delay.

The present invention discloses a method for optimizing the accuracy of battery charge and discharge power control for a BMS system. The method relates to the technical field of charge and discharge parameter control, including: constructing a second-order RC network equivalent circuit model and fitting the model parameters through pulse charge and discharge experiments; identifying error sources and quantifying the current BMS charge and discharge power control error; selecting a Hall effect sensor and a voltage sampling chip for experimental data acquisition; establishing a temperature compensation model for charge and discharge efficiency; introducing an adaptive control algorithm; employing a multi-stage constant current-constant voltage charging algorithm; integrating a capacity decay model and an internal resistance growth model; and employing a real-time operating system and a time-triggered task scheduling mechanism to control the cycle of charge and discharge power control instructions, and performing dynamic resource allocation and delay control. By employing a second-order RC network equivalent circuit model and other technical means, the accuracy and stability of battery charge and discharge power control are significantly improved.

The application discloses a forward converter soft switching control circuit and belongs to the technical field of analog integrated circuits, and aims to solve the problems of poor self-adaptation, low precision and difficulty in compensating system delay of an existing dead zone control scheme; the circuit comprises a zero-voltage switching detection circuit, a charge pump phase detector and a voltage-controlled dead zone time circuit, and the three components form a closed-loop negative feedback loop; the zero-voltage switching detection circuit monitors the drain voltage of a main switch tube and generates a ZVS pulse when the voltage is zero; the charge pump phase detector compares the phase difference between the ZVS pulse and the rising edge of a main switch tube driving signal and outputs an error voltage; and the voltage-controlled dead zone time circuit linearly adjusts the dead zone time according to the error voltage, so that the rising edge of the driving signal is aligned with the zero point of the drain voltage. The circuit can automatically compensate the driving delay, adaptively track the working condition change, realize soft switching, reduce the loss, optimize EMI and balance the high frequency and high efficiency of the converter.