245 results about "Deadband" patented technology

The invention discloses a dual-mode TDC implementation method and system based on an FPGA, and relates to the technical field of electronic circuits, and the technical key points are as follows: after a dual-mode signal generation circuit receives each STOP pulse, a logic sequence opposite to the last time is immediately output as an effective delay signal, the reset of the last time signal in a time delay chain (TDL) is not required, and the time delay time is shortened; when the logic signal propagated last time does not completely fade, the new reverse logic signal can be independently propagated in the TDL, and the new reverse logic signal and the new reverse logic signal do not interfere with each other; meanwhile, the rising edge of the system clock only updates the state of the main trigger to serve as the logic reference of the next trigger, and an additional reset process is not needed, so that the dead zone time of single measurement is strictly controlled to be a single period corresponding to the system clock, and compared with a double-period dead zone in an existing scheme, the dead zone time is remarkably shortened, and the measurement rate is synchronously doubled; in a high-frequency pulse measurement scene, pulse loss caused by an overlong dead zone can be effectively avoided, and the measurement efficiency is remarkably improved.

The invention discloses a narrow pulse suppression method and device for dynamic adjustment of dead time, a medium and a controller, and the method comprises the steps: presetting the dead time of M periods in the future according to the real-time state of a motor and the dead time and current change rate of the first N periods, and outputting a working condition label at the same time, N and M being positive integers; determining target dead zone time Td according to the working condition label and the dead zone time of the M periods in the future; determining a dead zone time ratio Dd according to the target dead zone time Td, constructing an interval section of a PWM signal according to the dead zone time ratio Dd and a narrow pulse time ratio Dp, and constructing an upper bridge arm duty ratio function Dt and a lower bridge arm duty ratio function Db corresponding to each interval section according to the dead zone time ratio Dd and a duty ratio instruction Dm of the PWM signal; according to the interval section where the duty ratio instruction Dm of the PWM signal is located, a duty ratio function of the corresponding interval section is called, and a target PWM signal is output.

The invention discloses a complex wave-based permanent magnet synchronous motor all-electrical parameter online identification method and device. The method comprises the following steps: analyzing the influence of a voltage error caused by dead zone time on parameter identification, and performing corresponding dead zone compensation; a bias complex wave with a certain amplitude and frequency is injected into the d-axis current, so that the d-axis current meets a parameter identification continuous excitation condition; constructing three groups of effective current slopes through four groups of different input data stored in the steady state of the motor, and identifying three groups of parameters of resistance, direct-axis inductance and quadrature-axis inductance by referring to a d-axis voltage equation and adopting a least square method with a forgetting factor; and finally, updating the identified three groups of parameters as known quantities in a q-axis voltage equation in real time, storing two groups of different input data to construct a group of effective current slopes, and identifying flux linkage parameters by adopting a least square method with a forgetting factor. According to the method, the under-rank problem of all-electrical parameter identification of the motor is solved, the identification precision is high, and the identification error of each parameter is about 3%.

The invention discloses a current prediction control method and device for a permanent magnet motor, and the method achieves the real-time prediction of a voltage error caused by a dead zone and other non-ideal factors through the powerful nonlinear fitting capability of a feedforward neural network in combination with the learning of historical current time sequence characteristics. And the prediction error is further fed forward and compensated to a future current prediction model to improve the accuracy of current prediction, so that the cost function evaluation is more accurate, the optimal voltage vector is selected, and the steady-state current error and the low-speed torque ripple are effectively inhibited. In this way, precise control over the current of the motor is achieved, and the control precision and operation stability of the driving system are comprehensively improved.

The invention provides a coordination control method and device for an energy storage power station, electronic equipment and a storage medium, and belongs to the field of energy storage. Under the condition that the difference between the current frequency of the grid-connected point and the system frequency dead zone of the energy storage power station is greater than or equal to a preset frequency deviation threshold value, superimposing a primary frequency modulation instruction and a virtual inertia support instruction so as to doubly suppress the frequency change amplitude and the frequency change rate; the primary frequency modulation power is determined according to the SOC of the energy storage power station; when the system frequency fluctuates and deviates from the rated frequency, and the difference value between the current frequency of the grid connection point and the system frequency dead zone is smaller than a preset frequency deviation threshold value, or when the system frequency gradually approaches the rated frequency, a primary frequency modulation instruction is executed. The method can solve the problems that the energy storage power station is poor in frequency quick response performance and large in frequency steady-state deviation, and the service life of a battery is prolonged.

The invention provides a high-power electric heating fused salt heat storage control system which comprises a fused salt electric heating and electric heat tracing device and a central control unit, and the central control unit is directly connected with a core control system for electric heating power dynamic adjustment, fused salt temperature gradient control, electric heat tracing pipeline safety protection and the like. The method comprises the following steps: firstly, based on power grid frequency deviation, generating an electric heating power instruction through droop control and a dead zone link; secondly, establishing a fused salt temperature-flow-power kinetic equation, and identifying a nonlinear surge excitation source; and finally, designing a flexible voltage source type converter control law of the electric heat tracing power supply by adopting an all-drive control theory, directly counteracting a nonlinear term of the system, and converting an original equation into a linear stable system. According to the method, the influence of nonlinear factors on surge and other phenomena is eliminated, the surge problem of small-mass and small-flow fused salt is effectively solved, and the energy efficiency and reliability of the system are improved.

A harmonic modeling method of a power amplifier solves the problem that a traditional modeling method is not suitable for harmonic modeling analysis of a high-switching-frequency topological structure, and comprises the following steps: obtaining baseband harmonic and sideband harmonic caused by modulation nonlinearity according to the number of parallel half bridges, a modulation wave function and a carrier function in the power amplifier; according to the topological structure of the power amplifier, obtaining a circuit equation of the topological structure in the dead-zone time period; calculating the current amplitude envelope of the resonant inductor; and calculating a voltage error caused by the dead-zone time period according to the calculated current amplitude envelope in combination with a circuit equation of the dead-zone time period, performing Fourier decomposition on the voltage error to obtain distortion harmonics caused by the dead-zone time period of the power amplifier, and obtaining total harmonics in combination with the obtained baseband harmonics and sideband harmonics. According to the invention, the switching frequency when the total harmonic distortion is the lowest can be obtained through modeling.

The invention relates to the technical field of automatic assembly equipment, in particular to an automatic nut burying device based on high-precision servo drive and a control system thereof, and aims to solve the problem that the positioning precision is degraded due to micro-step error accumulation caused by dead time under the high-frequency start-stop working condition. The device comprises a mechanical execution unit, a permanent magnet synchronous servo motor, a servo driver, an absolute photoelectric encoder and a central cooperative controller, according to the control method, a load dependent type dead zone online identification and compensation framework is constructed, an extended Kalman filter is triggered through a load torque observer to estimate dead zone parameters in real time, compensation voltage matched with a current load is dynamically generated and superposed to a q-axis instruction, and error accumulation is effectively restrained. And the accumulated position deviation does not exceed 0.1 mm after continuous operation for one thousands of cycles, so that the position precision and the beat stability in the nut burying process are remarkably improved.

The embodiment of the present disclosure provides a method and a device for controlling a three-level power converter, a control device and a power converter system.The method comprises: sensing an electric current on the AC side of a three-level power converter, wherein the three-level power converter is configured to perform power conversion between DC and AC; determining the response to the flow direction of the sensed electric current on the AC side and of a power switching group performing the current level switching; determining the compensation duty cycle to compensate for the dead zone of the power switching group based on the voltage or potential information of the three-level power converter and time information corresponding to the switching operation of the three-level power converter; and adjusting a duty cycle of at least one circuit breaker of the power switching group based on the compensation duty cycle; and sending a control signal based on the duty cycle after adjustment to at least one circuit breaker.The embodiments described in the present disclosure can reduce or eliminate distortions, harmonics and other errors caused by the dead zone duration.

The invention relates to the field of power electronic converters and control, in particular to an SOP power module dead-zone effect suppression method, which comprises the following steps: acquiring the current transmission power of an SOP power module; based on the transmission power, generating a first bus voltage instruction used for controlling an AC-DC side direct current bus voltage and a second bus voltage instruction used for controlling a DC-AC side direct current bus voltage, adjusting the corresponding direct current bus voltage so as to inhibit polarity reversal of a DAB converter bridge port voltage, and according to the transmission power of the SOP power module, adjusting the polarity of the DAB converter bridge port voltage. A first bus voltage instruction and a second bus voltage instruction are generated, the first bus voltage instruction and the second bus voltage instruction are made to be unequal during light load, a bus voltage difference value is formed, and it is ensured that the direct-current bus voltages on the two sides meet the condition for restraining DAB bridge port voltage polarity reversal in the dead-zone time period by means of compensation for frequency doubling fluctuation components in the direct-current bus voltages. Current zero step is eliminated, soft switching is recovered, voltage stability under light load is improved, extra hardware or complex control is not needed, and engineering realization is simple and convenient.

The application discloses a variable frequency device dead zone compensation method, which acquires real-time data of a load current, obtains characteristic harmonics of dead zone generated current according to the real-time data of the load current, inputs the characteristic harmonics after taking the opposite to a regulator, then obtains a characteristic harmonic control quantity, and finally obtains a compensation time point or a compensation amplitude of the dead zone compensation according to the characteristic harmonic control quantity. The application improves the precision of the dead zone compensation, further reduces the harmonics of the system, has low sensitivity to the load characteristic change, and does not need to acquire a special dead zone compensation table.

The invention provides a dead zone compensation method, device and equipment of an energy storage converter, a medium and a product, and relates to the technical field of energy storage systems. According to the method, the interval of each phase of current is determined according to the three-phase output current acquired by the current sensor, and the basic dead zone compensation amount is dynamically calculated by combining the preset linear function, so that the problem of overcompensation or undercompensation caused by the fact that the existing fixed compensation amount method does not consider the compensation demand difference of different current magnitudes is avoided; the compensation direction is determined by obtaining the instantaneous value of each phase of modulation wave so as to obtain the target dead zone compensation amount, and accurate matching of the compensation direction and the expected output voltage direction is ensured; and the target dead-zone compensation amount and the original modulation wave are superposed to generate a corrected modulation wave, and then a pulse width modulation signal driven by a switching tube is generated, so that the pulse width modulation waveform difference caused by dead-zone time can be effectively counteracted, the output current harmonic wave of the energy storage converter is reduced, and the energy storage efficiency is improved. And stable and reliable operation of the energy storage converter and the whole energy storage system is ensured.

The application discloses an electromagnetic detection optimized bipolar SHMPWM transmitting method, which comprises the following steps: S1, by analyzing the influence of the resistive and inductive load on the transmitting current waveform distortion and the transmitting spectrum energy loss, extending the current waveform based on the equal-area principle, compensating for the lost transmitting current spectrum energy, and calculating the current waveform extension time; S2, considering the inductive load and the dead zone effect, establishing a bipolar SHMPWM nonlinear equation set; S3, using the particle swarm algorithm to iteratively operate the bipolar SHMPWM nonlinear equation set, and obtaining the solving result of the switching angle of the half-cycle symmetric SHMPWM. The application adopts the optimized particle swarm algorithm to solve the equation set to obtain the switching angle, and realizes that the frequency domain information of the half-cycle symmetric SHMPWM frequency focusing waveform conforms to the specific harmonic amplitude set by the expectation.

The invention relates to the technical field of power supply and distribution systems, and discloses a state-aware undisturbed switching control method for a heat pipe cooling double-loop system, which comprises the following steps of: acquiring a hot node temperature and a steady-state integral operator value of a main heat dissipation distribution branch for representing a power load heat dissipation state, and synchronously monitoring cold-state temperature response data of a standby branch; constructing a dynamic thermal resistance topological model and substituting a steady-state integral operator numerical value to inversely calculate an integral preset initial value; according to the invention, the switching logic is reconstructed to an automatic control function unit logic domain, a mechanical execution dead zone and phase change latent heat hysteresis are cooperatively eliminated, and the thermal power regulation execution unit is controlled to be stable and reliable. Transient thermal pulsation of a power distribution environment is suppressed, and thermal safety of a high-power load power supply link is guaranteed.

The application relates to a single photon avalanche diode front-end circuit for multi-mode detection, which integrates a quenching, delay control and self-resetting module composed of basic MOS tubes, inverters and logic gates. Three control signals are output by a controller to configure modes: in a synchronous gating mode, the related MOS tubes are sequentially controlled to be turned on and turned off in a gating mode; in an asynchronous free-running mode, the related control levels are fixed, and the reset delay is linearly controlled by adjusting the third control signal. The application realizes dual-mode detection by using a single circuit structure, shares the core quenching path, has the advantages of small area, low power consumption and wide adjustable range of dead time, and is suitable for large-scale SPAD array integration.

This invention relates to a method and system for reducing frequent tap changer operations at receiving-end converter stations. The method includes: determining the dead zone range of the receiving-end converter station's shut-off angle; determining the relationship between the dynamic proportional coefficient h and the number of tap changer operations based on the operating characteristics of the UHVDC transmission system; and determining an initial value for the shut-off angle that reduces frequent tap changer operations at the receiving-end converter station based on the determined dead zone range of the receiving-end converter station's shut-off angle and the relationship between the dynamic proportional coefficient h and the number of tap changer operations. This invention can significantly reduce the number of tap changer operations at receiving-end converter stations, thereby reducing the probability of converter transformer failures and improving the operational reliability of converter transformers at the converter station. This invention can be widely applied in the field of power transmission system technology.

The invention relates to the field of sensor data calibration, in particular to an intelligent sensor data calibration method for sensing the state of an electric reactor, which comprises the following steps of: mapping power supply voltage into three engineering states of stability, drifting and distortion based on the physical characteristics of an analog device, and introducing asymmetric hysteresis comparison logic to prevent the state oscillation of a critical point. In the stable state, the system executes baseline clamping and dead zone control to filter background noise; in a drift state, a look-up table is preset based on a real-time voltage index, and sensor gain attenuation is compensated by using a fixed-point displacement algorithm; and in a distorted state, starting a logic fusing mechanism to shield invalid signals. In addition, timing alignment of low-speed power data and high-speed partial discharge signals is realized through a zero-order holding strategy. The problems of signal distortion and false alarm caused by power supply voltage fluctuation are effectively solved, and the robustness and monitoring accuracy of the sensor in a complex electromagnetic environment are remarkably improved.

The invention discloses an operation control method and system of a direct-drive motor, and relates to the technical field of control of the direct-drive motor, and the method comprises the steps: collecting three-phase voltage fluctuation data in real time, extracting a harmonic spectrum in combination with frequency domain analysis, preliminarily estimating the conduction delay and dead-zone compensation time, and increasing dead-zone compensation to form a preliminary optimization parameter when low-order harmonics exceed the standard; and then neutral point deviation, common-mode voltage and three-phase asymmetry degree are evaluated through waveform simulation, finally, a swarm intelligence optimization algorithm is adopted to iteratively adjust a potential balance correction coefficient, conduction delay, dead zone compensation and an interphase time sequence deviation angle to obtain a target time sequence parameter, and a three-phase switch control instruction is generated to be applied to a control system. According to the invention, in the control of the high-power direct-drive motor, the harmonic interference is effectively reduced by optimizing the time sequence design of the switching action, meanwhile, the system risk caused by potential imbalance is avoided, and the operation stability and reliability of equipment are improved.

The application discloses a control method for primary frequency modulation in a power dead zone range of a hydroelectric generating set, and belongs to the technical field of hydroelectric generating set regulation. The method comprises the following steps: S1, calculating H1 and H2 of a water diversion system according to the water flow inertia time constant of the water diversion system and the mechanical inertia time constant of the generating set; S2, calculating a dynamic analytical expression of the generating set power when a frequency unit step disturbance occurs; S3, calculating a first-order differential link coefficient decomposed by a second-order correction link based on the dynamic analytical expression of the generating set power; and S4, calculating the output of a PID speed regulator in a current sampling period. The scheme calculates the oscillation link transfer function parameters in a dynamic process, and a second-order system correction transfer function of a frequency given value is designed on the basis, so that the oscillation phenomenon of the generating set power does not occur when the frequency given value of the generating set changes, the problem that the power exceeds the power dead zone in the dynamic process is prevented, and a limiting link is arranged at the frequency deviation value to ensure that the power steady-state value exceeds the power dead zone range.

The application discloses a dead time control circuit and electronic equipment, and belongs to the technical field of electronics. The dead time control circuit comprises an inductive element, a first field effect tube connected with the inductive element, a second field effect tube connected with the inductive element and the first field effect tube, a detection circuit for detecting a first switching state of the first field effect tube, a second switching state of the second field effect tube and a current flow direction of the inductive element, a logic judgment circuit for outputting an adjustment mode signal of a dead time, a first off time and a second off time according to the first switching state, the second switching state and the current flow direction, an operation circuit for outputting a dead time control signal according to the first off time and the second off time in an adjustment direction indicated by the adjustment mode signal, and a time delay circuit, wherein the dead time control signal is used for adjusting a time delay value of the time delay circuit to adjust the dead time of the first field effect tube and the second field effect tube.

The invention discloses a resonant circuit overcurrent protection system and method in the technical field of resonant circuit overcurrent protection, a resonant circuit is connected with a current sampling circuit and a driving circuit, and the system comprises an overcurrent protection module used for detecting an overcurrent event of the resonant circuit. The control module is used for carrying out PWM (Pulse-Width Modulation) wave sealing in a dead zone after the resonance circuit is over-current; the over-current protection module comprises an over-current detection circuit, an over-current signal holding and resetting circuit and a primary over-current protection circuit. According to the invention, the overcurrent detection circuit is adopted to detect an overcurrent event, based on an overcurrent signal, the reset circuit cooperates with the first-stage overcurrent protection circuit, precise control of PWM wave sealing is carried out in a dead zone, after the overcurrent event is detected, the overcurrent signal is locked, and the turn-off operation is carried out after waiting for the dead zone moment, so that a switching tube is always turned off near a current minimum value, and thus the power consumption is reduced. The turn-off voltage stress is obviously reduced, a switching tube with lower withstand voltage is allowed to be selected, and the cost is reduced.

The application relates to the field of power electronics, and particularly provides a LLC resonant converter soft-start control method and device and an LLC resonant converter, wherein the method comprises sequentially performing three-stage soft-start control, wherein in the first stage, a fixed dead zone is used to gently establish resonance for a first time length; in the second stage, a non-linear algorithm based on multiple hiccup periods and a decreasing quantity increasing with periods is used to smoothly adjust the dead zone; and in the third stage, the dead zone is decreased to a target value at a two-stage speed of slow first and then fast; fault detection including at least start timeout and input voltage abnormality is performed in parallel in the whole process; start completion is judged based on multiple conditions of total time, dead zone value and voltage ratio; and when the driving dead zone is updated, protection of not being lower than a safety minimum value is forced to be performed. Through the above common control, the converter is smoothly and quickly started, and the start impact and voltage stress are effectively inhibited.

The invention provides a heat pump frequent start-stop prevention control method based on fuzzy control and frequency gradual change, and the method comprises the steps: firstly constructing a fuzzy control model through a temperature difference and a change rate thereof, predicting a load change trend, and dynamically adjusting the width of a temperature control dead zone; then, combining the current frequency with a dead zone state to initialize a target frequency, and adopting a nonlinear frequency gradient path to realize smooth adjustment; in the low-frequency operation stage, a low-frequency stability factor is introduced to judge the operation state, time is accumulated only under the stable condition, and short-time frequency increasing oil return protection is triggered; and finally, when the temperature difference is continuously in a dynamic dead zone, the frequency is lower than a safety threshold value, the low-frequency stable time reaches the standard and the oil is not returned, the shutdown operation is executed. The heat pump system is converted from start-stop control to continuous flexible adjustment, the energy efficiency is effectively improved, the comfort is effectively improved, and the service life of equipment is effectively prolonged.

The application relates to a voltage compensation method and a voltage compensation device. The method comprises the following steps: in a first duty cycle calculation period, a first output voltage, a first output voltage corresponding expected output voltage, a standard bus voltage and a first motor vector voltage are obtained; an error voltage between the first output voltage and the expected output voltage reflects changes of the bus voltage and the motor vector voltage; the first motor vector voltage is compensated according to the error voltage; a first compensation duty cycle is determined according to the compensated first compensation vector voltage and the first motor vector voltage; in a first duty cycle update period, the output voltage of an inverter control system is controlled according to the first compensation duty cycle, so that the output voltage is equal to the expected output voltage, and the error voltage generated in the last duty cycle update period is compensated. The voltage compensation method does not change the carrier frequency, thereby avoiding the influence of the switching loss and the dead zone on the output voltage caused by the increase of the carrier frequency.

The invention discloses a dead zone and hysteresis compensation method and system for an engineering machinery proportional electromagnetic valve, and belongs to the technical field of electro-hydraulic servo control, and the method comprises the steps: obtaining an output instruction of a main controller in a current control period and the actual output feedback of the system; calculating nominal output through a discrete nominal model based on the main controller output instruction; calculating an output error according to the actual output feedback and the nominal output; estimating a total disturbance by a discrete Q filter based on the output error; on the basis of the total disturbance, a feed-forward compensation amount is generated through a discrete inverse model; and superposing the feed-forward compensation quantity with an output instruction of the main controller to obtain a final control quantity for driving a proportional electromagnetic valve. According to the method, all kinds of nonlinearity are uniformly regarded as disturbance for estimation compensation, the method does not depend on an accurate physical model of an object, is not sensitive to parameter changes and external interference, and has high robustness.

The present invention relates to an audio-based anti-cant indication system for shooting devices such as rifles, pistols, bows, and crossbows. The system includes an inclination sensor configured to detect angular tilt relative to gravity and a processing module configured to compare the detected tilt against a predefined deadband threshold corresponding to a plumb orientation. When the shooting device deviates from the plumb condition, the processing module activates an audio output module that generates distinct audio signals representing left-tilt and right-tilt conditions, while producing a null or muted output when the device remains within the deadband. The system may further include variable tone pitch or volume, wireless audio transmission to earbuds or headsets, calibration mechanisms, front-rear inclination detection, and idle-state shutoff. The invention provides continuous, hands-free cant feedback without requiring visual attention.

The invention discloses a sending-end power grid frequency characteristic analysis method, system and device considering multiple dead zones and multiple control modes and a medium, and belongs to the technical field of power system planning operation. Constructing a droop control model of the new energy, a virtual inertia control model, rotor motion models under a plurality of synchronous units, a second-order speed regulation system model, a frequency regulation model of a load, a set value of a primary frequency modulation dead zone of the synchronous units, a direct current frequency limit control model, a dead zone set value and virtual inertia control of a direct current sending part; identifying parameters of the synchronous unit speed regulation system through a time domain simulation method; establishing a power grid frequency response model; and analyzing frequency characteristics and influence factors of the sending-end power grid by adopting a Routh criterion and a root locus method. The auxiliary sending end power grid planning operation provides decision support for a new energy control mode and a control mode of a direct current power transmission system.

This paper describes devices, methods, and techniques for preventing communication blockages caused by latching in directional isolated buffers while simultaneously meeting the requirements of various communication protocols such as I2C, SMBus, and PMBus. These devices utilize techniques based on digital state machines to fulfill the requirements of these communication protocols. The digital state machines are designed to extend the time interval during which the voltage resulting from the transmission of data from an external driver to a bus of the bidirectional isolated buffer remains within the voltage dead zone.This allows the device to determine whether the external peripheral device has initiated the transmission of data directed to the external driver - and thus prevent communication blocking due to latching - without the user having to interpret a voltage occurring on a bus as a logical 0, even though it is greater than the VOL specification.

The application provides a mixed control LLC series resonant converter dead-time control method, which respectively calculates the current of phase leading and lagging bridge arm switch time and the shortest dead-time required for realizing ZVS (zero voltage switching), and uses a parameter fitting method to simplify the calculation amount, and controls the dead-time of two bridge arm switches in real time on an embedded controller. The application considers the different dead-time required for realizing zero voltage switching of the two bridge arm switches of the primary side of the mixed control LLC series resonant converter, and controls in real time, so that the primary side switch loses zero voltage switching due to working condition change is prevented, and the reverse conduction time of the switch is reduced as much as possible, and the loss is reduced. The application has good application effect in the mixed control LLC series resonant converter with high frequency and wide gain range.

The utility model discloses an integrated circuit, which belongs to the technical field of semiconductors, comprises a logic gate circuit Gata, a dead zone control unit, an over-current protection unit and a driving output unit, solves the technical problems of providing stable dead zone control, quickly responding to over-current protection and preventing simultaneous conduction of HO and LO in the process of driving an H bridge, does not need to be controlled by an MCU (Microprogrammed Control Unit), and is convenient to use. The system independence is improved, the hardware circuit response speed is high, RC delay and a Schmitt trigger are adopted, stable and reliable dead time is ensured, efficient dead time control is achieved, a current sampling resistor, a comparator and a D trigger are adopted for over-current detection, the response speed is high, an H-bridge driving signal is cut off immediately during over-current, damage is prevented, the logic gate design ensures that no driving signal exists when A = 1 and B = 1 or A = 0 and B = 0, and the system reliability is improved. H-bridge direct connection is avoided, overcurrent alarm is provided through an ALRM pin, and fault detection of the system is facilitated.