1168 results about "Short circuit protection" patented technology

The invention discloses a 5G base station power supply state intelligent monitoring system and method, and belongs to the technical field of intelligent monitoring. According to the system, operation parameters of a 5G base station power supply are acquired in real time through the data acquisition module, and after the operation parameters are processed by the signal conditioning and conversion module, the master control processing unit analyzes digital signals in real time, detects abnormal states and generates alarm information. The communication module is responsible for data transmission and instruction receiving, and the power management and safety protection module provides overvoltage, undervoltage, overcurrent and short circuit protection and triggers emergency measures. The artificial intelligence analysis module performs fault prediction and performance optimization based on historical data and real-time data, and the remote monitoring terminal realizes data visual monitoring and management. According to the invention, the real-time performance and accuracy of monitoring are improved, unified management of multiple base stations is realized, the operation and maintenance cost is reduced, and stable operation of a 5G communication network is guaranteed.

The invention discloses a power supply circuit, a power supply method, a server, a product and a medium, and relates to the technical field of server power supply, the total power demand of the server is dispersed through the parallel design of multiple power panels, the bus current of a single board connected to a first voltage is reduced to the safe bearing range of an MOS tube, the impact risk is reduced, and the service life of the server is prolonged. The electronic fuse is matched with the single-board power to set an overcurrent protection threshold value, and the short-circuit protection response time is shortened; each board is independently provided with a power supply brick to realize second voltage localization conversion and single board output current reduction, a multi-board output end combined power supply design is combined, a heat source is dispersed to eliminate heat accumulation, the through-current capability is multiplied through a parallel path, and the heat dissipation and electrical design feasibility of the circuit board is improved. The technical problems of MOS tube over-limit, overcurrent protection delay, circuit board heat accumulation and difficult through-flow caused by large current brought by a power supply in a high-power server are solved, and the technical effects of enhancing power supply reliability and optimizing energy efficiency are achieved.

The utility model discloses a busbar, battery module and battery pack, the busbar includes at least two conducting strip, by setting the first weak part and the second weak part above the thinning area, when the pressure is released, the thinning area will be burst open by the high pressure gas in the single battery, and the impact force will break the first weak part and the second weak part. Therefore, the pressure release valve can efficiently and smoothly release pressure; and when the first weak part and the second weak part are disconnected, the circuit connection between the two adjacent single batteries is also disconnected, so that short-circuit protection is realized, and finally, dual protection of pressure relief protection and battery cell short-circuit protection is synchronously realized. In addition, the first weak part and the second weak part are fused due to overcurrent when being subjected to strong current, and dual protection can also be achieved. The battery module with the busbar can realize dual protection of internal pressure relief protection and battery cell short-circuit protection of the battery module. The battery pack with the battery module has higher safety performance.

The invention discloses a power device driver and a parameter correction method thereof, which are applied to the technical field of power device driving, and are characterized in that a data acquisition module acquires grid voltage and peak current of an IGBT (Insulated Gate Bipolar Translator) in the working process of the IGBT to obtain sampling data; the digital isolation chip realizes electrical isolation among the data acquisition module, the MCU and the grid voltage regulation module; the MCU calibrates the real-time junction temperature data based on the sampling data by using a preset junction temperature calibration formula and outputs calibrated junction temperature data; the gate driving chip outputs a gate voltage capable of driving the IGBT according to the control signal; the second-order short-circuit protection module sends an abnormal signal to the MCU when the IGBT is short-circuited, so that the MCU sends a grid voltage regulation trigger signal to the grid voltage regulation module; the grid voltage adjusting module responds to the grid voltage adjusting trigger signal and controls itself to reduce the grid voltage. Based on the power device driver and the parameter correction method thereof provided by the invention, the junction temperature monitoring precision and reliability are improved.

The invention relates to the field of display, and discloses a short-circuit protection circuit, an array substrate, a display device and a short-circuit protection method.The short-circuit protection circuit is used for an OLED device and comprises the steps that an information sensing module obtains the actual working current of the OLED device and real-time parameters related to the working state of the OLED device; the dynamic expectation calculation module calculates the dynamic expectation working current n of the OLED device according to the real-time parameters and a preset OLED electrical characteristic model; the decision module synthesizes the actual current, the expected current and the current change rate / fluctuation amplitude to generate a risk judgment signal; and the response control module executes protection operation according to the judgment signal. According to the OLED short-circuit protection method, the accuracy, the sensitivity and the intelligent management level of OLED short-circuit protection are remarkably improved through the technology of dynamically calculating the expected current and carrying out decision making and parameter self-adaptive adjustment by fusing the actual current time sequence characteristics.

Disclosed is a device for detecting and protecting a short circuit of a switch. A short-circuit protection device according to an embodiment of the present invention includes a voltage measurement unit configured to measure an output voltage of a switch and output the output voltage as a measured voltage, a comparison unit configured to compare the measured voltage with a specified reference voltage, and a connection unit that is connected between the voltage measurement unit and the comparison unit and in case that the switch is turned off, the connection unit is configured to connect an output terminal of the voltage measurement unit to a first ground.

A self-triggering, bidirectional control electronics component for an electronic switch (50), for the detection and rapid shutdown of currents at a selected threshold value for both current flow directions, includes a threshold switch having a plurality of selectable shutdown threshold values for both current flow directions, the threshold switch coupled to a bidirectional current sensor system (65), arranged in the electronic switch, based on sensing of sensors on an input side of the threshold switch; and a high-speed de-energizing circuit (53) on an output side of the threshold switch including a high non-load circuit voltage for rapid removal of current from a magnetic drive coil (45), the high-speed de-energizing circuit being configured to rapidly remove the current from the magnetic drive coil when the bidirectional current sensor system senses a current greater than or equal to the selected threshold value among the plurality of selectable shutdown threshold values.

The invention provides a short circuit protection system and a bidirectional rail alternating current traction system. The short circuit protection system is coupled with a converter, and the converter is coupled with an alternating current bus through a switch; the short-circuit protection system comprises a sampling circuit, a processor and a short-circuit detection device. The sampling circuit is coupled with the direct current end of the converter and is configured to convert a first electric signal of the direct current end into a first voltage signal; the processor is configured to convert a second electric signal of the direct current end into a second voltage signal; the short-circuit detection device is coupled with the output end of the sampling circuit and the output end of the processor, and is configured to perform near-end short-circuit detection based on the first voltage signal and perform far-end short-circuit detection based on the second voltage signal; under the condition that near-end short circuit and / or far-end short circuit occurs, a short-circuit protection enable signal is output; the processor is further configured to respond to the short circuit protection enable signal, block the converter and turn off the switch.

The invention belongs to the technical field of aircraft power supply systems, and particularly relates to an aircraft single-phase emergency alternating current power supply system and a switching method. Comprising an AC power distribution box, an emergency AC power control box, a DC power distribution box, a power control and display module and a static converter. The alternating current power distribution box is used for connecting an onboard main alternating current power supply or an auxiliary alternating current power supply or a static converter power supply, supplying power to alternating current electric equipment and transmitting a single-phase normal alternating current bus bar power supply to the emergency alternating current power supply control box; the emergency AC power supply control box is used for carrying out real-time power loss monitoring on a single-phase normal AC bus bar in the AC power supply distribution box, connecting the single-phase normal AC bus bar in the AC power supply distribution box with a single-phase emergency AC bus bar when power loss is monitored, and connecting the single-phase emergency AC bus bar with the single-phase normal AC bus bar in the AC power supply distribution box when power loss is monitored. The static converter is connected with the single-phase emergency AC bus bar, and self state information and output power information of the static converter are fed back to the power control and display module; the direct-current power supply distribution box is used for accessing an airplane direct-current power supply, providing an emergency direct-current power supply for the power supply control and display module and the static converter, and realizing power supply input control and short-circuit protection of the static converter; and the static converter is used for converting the emergency direct-current power supply output by the direct-current power supply distribution box into a single-phase alternating-current power supply and feeding back state information of the static converter to the power supply control and display module. The problem of reliable and automatic conversion of the single-phase emergency alternating current power supply under the condition that the airplane loses a main power supply system and an auxiliary power supply system and a normal alternating current bus bar loses power is solved.

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery cell includes a housing, an electrode assembly, and a current collector. The shell comprises a wall part; the electrode assembly is accommodated in the housing, and one side, facing the wall part, of the electrode assembly is provided with a first tab. The current collector is arranged between the first tab and the wall part and comprises a first connecting part, a second connecting part and a fusing part; the first connecting part is connected to the wall part and is spaced from the first tab; the second connecting part surrounds the first connecting part, is connected to the first tab and is spaced from the wall part; the fusing part is connected with the first connecting part and the second connecting part, and the fusing part, the first tab and the wall part are arranged at intervals. When internal short circuit occurs in the single battery, the fusing part can be fused under the action of instantaneous high temperature, so that a current loop in the single battery is disconnected, a short-circuit protection effect is achieved, potential safety hazards such as fire and explosion caused by short circuit of the single battery are reduced, and the reliability of the single battery is improved.

The embodiment of the invention provides a method and device for inverter control, an inverter, a motor system, a computer readable medium and a computer program product. The method can comprise the steps of determining whether a plurality of bridge arms of the inverter can enter an active short circuit (ASC) state or not under the condition of determining that the inverter needs to enter an ASC protection mode; and under the condition of determining that at least two bridge arms in the plurality of bridge arms can enter the ASC state, controlling the at least two bridge arms to be alternately in the ASC state.

The invention discloses an active protection control system and method of a motor controller and an electric vehicle. Comprising a phase current frequency detection module, a voltage conversion module, a driving chip, a control module, a high-voltage alternating-current electricity taking module and a power module, the phase current frequency detection module is used for detecting a real-time phase current frequency value of a three-phase winding of the motor in real time; the control module is used for storing a phase current frequency limit value and outputting an enable signal of the voltage conversion module; the high-voltage alternating current power taking module is used for obtaining at least one phase of alternating current in the three-phase alternating current and supplying power to the voltage conversion module; the voltage conversion module is used for receiving the voltage conversion enable signal, starting working, converting at least one phase of alternating current into working voltage required by the power module, and outputting the working voltage to a fault pin of the driving chip and a grid electrode of a driving tube of an upper bridge arm or a lower bridge arm in the power module; the active short-circuit protection of the motor in a galloping or overspeed state is realized, and the overvoltage damage of the motor controller is avoided.

A short-circuit protection circuit in a battery protection system having a battery, a charge switch and a discharge switch connected in series. The short-circuit protection circuit includes: a drive unit having a first output terminal coupled to a control terminal of the discharge switch and a second output terminal coupled to a control terminal of the charge switch, and configured to output a discharge drive signal through the first output terminal to turn on or off the discharge switch, and output a charge drive signal through the second output terminal to turn on or off the charge switch; and a short-circuit detector configured to perform a short-circuit protection when the short-circuit occurs. One of the charge drive signal, the discharge drive signal and a power supply having a higher voltage is configured to supply power to the short-circuit detector.

The utility model discloses a photovoltaic inverter circuit, an inverter and a system, and the photovoltaic inverter circuit comprises a frequency conversion circuit; a multi-path short-circuit protection circuit; the multi-path boost circuit comprises at least two boost modules, each boost module comprises at least two boost circuits, and the output ends of all the boost modules are cascaded and connected with the input end of the frequency conversion circuit; the positive input end of each booster circuit is used for being connected with the positive electrode of a photovoltaic module, the negative input end of each booster circuit is connected with the negative electrode of the photovoltaic module through a short-circuit protection circuit, and the positive electrode connected with the positive input end of each booster circuit and the negative electrode connected with the negative input end of each booster circuit through the short-circuit protection circuit belong to the same photovoltaic module; wherein each short-circuit protection circuit is used for stopping outputting the current of the negative electrode of the connected photovoltaic module to the negative input end of the booster circuit. According to the technical scheme of the utility model, the inverter can be protected when the non-isolated string type photovoltaic inverter is short-circuited to the ground.

The invention discloses a hybrid excitation synchronous motor control method and system, and belongs to the technical field of motor control. The problem that a motor control system can operate at high precision when a position sensor breaks down is mainly solved. The method comprises the following steps that when a position sensor breaks down, a system is switched to an active short circuit protection (ASC) mode, and operation of a motor is controlled by giving instruction values of d-axis current and q-axis current in the mode; then, in an ASC mode, estimating a rotor angle through a voltage equation in a static coordinate system, so as to obtain an electrical angle of a rotor; after the rotor angle estimation is completed, the system is switched from the ASC mode to the vector control mode without the position sensor, and the d-axis voltage and the q-axis voltage are adjusted in the mode, so that the motor can be continuously and accurately controlled and stably run. The invention provides an efficient and safe motor control method, and the safety and reliability of the electric vehicle under the condition of sensor fault are effectively improved.

The invention belongs to the field of power distribution network automation, and discloses a controllable drop-type intelligent fuse and a control method thereof. The controllable drop-type intelligent fuse comprises a measurement and control module which is arranged at the lower part of a fusion tube and is used for measuring the working current of the fuse, the high voltage of a line, the temperature of a fuse wire, the poor contact state of the fusion tube and the drop state of the fusion tube through a sensor and a corresponding measurement circuit, and communicating with a background server through a wireless communication function; the measurement and control module is connected with a configured micro motor and a measurement and control module torque output rotating shaft; the lower contact is provided with a novel tensioning structure which is used for enabling the fuse to be controlled to fall off. On the basis of keeping the function of an original traditional drop-out fuse as a short-circuit protection switch, a measurement control and wireless communication circuit is added; working current, fuse wire temperature and drop state can be measured, drop of the fuse can be controlled automatically or wirelessly and remotely when primary current is larger than a set value, and therefore load overcurrent protection is achieved.

The utility model provides a short-circuit protection circuit for a Type-C interface, and belongs to the technical field of short-circuit protection circuits. Comprising an interface module, an overvoltage and electromagnetic protection circuit and a switching circuit, the interface module, the overvoltage and electromagnetic protection circuit and the switching circuit are connected in series on the same power line and grounding line, and a common circuit and a standby circuit are arranged in the switching circuit and are both connected with the power line. According to the utility model, through the cooperation of the resettable fuse, the double-pole double-throw relay and other elements, the circuit can be rapidly switched so as to ensure that the interface can continue to work normally without maintenance when a short-circuit fault occurs, and through the synergistic effect of the gas discharge tube, the first transient suppression diode, the second transient suppression diode, the electrolytic capacitor and other elements, the short-circuit fault of the interface can be effectively prevented. The problems of overvoltage and electromagnetic interference during short circuit can be effectively relieved.

The utility model relates to the technical field of microphone rods, in particular to an extremely simple circuit, which comprises a voltage microphone V-MIC2, an electret microphone MIC2, a microphone negative terminal MIC1-N, an audio signal port GPIO-12 and an external microphone rod. Wherein the output pin of the voltage microphone V-MIC2 is connected with a resistor R26, the other end of the resistor R26 is connected with a resistor R27, and the other end of the resistor R27 is connected with the output end of the electret microphone MIC2. Through the arrangement of the circuit, the circuit has the advantages of smaller size of an electronic wire, simpler circuit, short-circuit protection function and lower cost, and solves the problems that a 2PIN is used as a microphone working channel, a 1PIN is additionally used for detecting insertion and extraction, and a 1PIN is additionally used for detecting a key, so that the size of a connector is larger, the size of an earphone becomes larger, and the cost is reduced. In the prior art, the number of the electronic wires is changed from two to four, and the electronic wires become thicker, so that the open type Bluetooth telephone traffic earphone cannot realize microphone rod detection and stable conversation effect in a narrow contact area.

The invention discloses a high-side driving circuit, an electronic device, a vehicle and a control method. False triggering of a short-circuit protection mechanism is avoided. The high-side driving circuit comprises a power distribution circuit, a sampling circuit and a fault protection circuit, the power distribution circuit comprises a PMOS transistor and a first resistance circuit; the grid electrode of the PMOS tube is grounded through the first resistance circuit, the drain electrode of the PMOS tube is connected with a load, and the source electrode of the PMOS tube and the input end of the fault protection circuit are connected with a power supply; the output end of the fault protection circuit is connected with the grid electrode of the PMOS tube; the sampling circuit is connected with the drain electrode of the PMOS tube and the ground; the output end of the sampling circuit and the control end of the fault protection circuit are connected to the control unit; the control unit judges whether load short circuit occurs or not according to the sampling voltage, if not, the fault protection circuit is forbidden to output voltage, and if yes, the fault protection circuit is controlled to convert input voltage into target voltage to be output; the PMOS tube is in a variable resistance region when the fault protection circuit has no voltage output, and enters a cut-off region when the PMOS tube outputs a target voltage.

The invention discloses a battery monomer, a preparation method thereof, a battery and an electric device. The battery monomer comprises a positive pole piece and a negative pole piece, and at least one of the positive pole piece and the negative pole piece comprises a current collector, an active material layer, a first porous layer and a second porous layer; the active material layer is at least positioned on one side surface of the current collector; the first porous layer covers the active material layer and comprises a first insulating material; the second porous layer covers the first porous layer, the second porous layer comprises a second insulating material, and the porosity of the second porous layer is larger than that of the first porous layer. The first porous layer and the second porous layer protect the active material layer, so that the probability of direct contact between the active material of the positive pole piece and the active material of the negative pole piece is reduced, dual internal short circuit protection is realized, and the stability of the battery is improved.

The invention relates to a digital supercharging control method and device based on a fitting algorithm, and belongs to the field of carrier rocket gas flow monitoring. According to the digital pressurization control method based on the fitting algorithm, the gas flow adjusting efficiency and the response speed are improved through the steps of signal recording, data rationality judgment and fitting algorithm processing, the pressurization control algorithm and a two-out-of-three control mode are adopted, control decision making is conducted, and an auxiliary electromagnetic valve is controlled. As the two-out-of-three control mode is adopted in the three paths of redundant signals, two paths of most reliable signals are selected for control decision making, and the reliability of the control method is further improved. The design of double-path independent short-circuit protection, double EMI filters, double DC / DC modules, redundant power output and the like is adopted in the power supply module in the digital boost control equipment, high-reliability power supply from a primary power supply to a secondary power supply is achieved, the fault-tolerant capability of the system is improved, and the stability and reliability of the power supply module are remarkably enhanced.

The invention discloses a resonant converter output overload and short circuit protection system and method without output current detection, and belongs to the technical field of power electronic converters. When a resonance tank current peak detection signal is equal to a ramp signal to trigger a comparator to output a high-level pulse, the edge triggers the microcontroller to interrupt, and the register value of the current ramp signal is captured immediately after interruption, so that a resonance current peak can be obtained. After an output overload and short circuit fault mark based on the value and the output voltage is triggered, the switching frequency is adjusted through the slope parameter self-adaptive controller to achieve output overload protection, and when the output overload is serious or short circuit occurs, rapid wave sealing protection can be achieved through a software code and a hardware comparator. And meanwhile, the soft start function of the resonant converter can be realized by gradually decreasing the initial value of the set slope descent rate cycle by cycle during starting. The control performance of the resonant converter is improved under the control of the peak current, and the output overload and short circuit protection function can be realized without adding an output current detection circuit.

The invention discloses an electrical stimulation output open-short circuit protection circuit and an electrical stimulation therapeutic apparatus. The problem of misjudgment caused by the fact that short circuit or open circuit of the electrical stimulation therapeutic instrument is not distinguished is solved. A sampling control circuit outputs a trigger signal when a PWM signal is at a high level and keeps silent when the PWM signal is at a low level, and after a sampling processing module receives the trigger signal, the sampling processing module immediately collects current and voltage signals, carries out calculation and judgment and sends a result to a controller. The controller executes corresponding protection operation according to an open-circuit and short-circuit judgment result sent by the sampling processing module, the sampling control circuit is connected with the sampling processing module, so that the sampling opportunity is accurately controlled, the real-time performance and the accuracy of signal acquisition are improved, and the reliability of the system is improved. Therefore, measures can be taken in time to protect the safety of a patient when an open circuit or a short circuit occurs, and the risk of treatment interruption or failure caused by circuit faults is reduced.

The invention discloses a short-circuit protection control method, a primary side control device, a secondary side feedback device and a switching power supply. The short-circuit protection control method comprises the following steps: an output voltage rectification detection step; a comparison output step; a modulation step; an isolation processing step; a demodulation step; and an output short circuit detection and protection execution step: determining whether the output of the switching power supply is short-circuited according to the feedback control signal, immediately closing the primary drive when the short circuit is identified, and performing soft start again after a third set time, the feedback control signal appearing for the first time is recognized to be equal to 1, and the duration time is smaller than or equal to first set time; or identifying that the time when the feedback control signal FB is continuously equal to 0 is greater than the second set time; and in the stable working stage, identifying that the time when the feedback control signal FB is continuously equal to 0 is greater than the second set time. The reliability of the switching power supply can be improved.

The utility model provides an SSPC short circuit protection self-locking circuit. The circuit comprises a power supply and signal isolation unit, a DCDC boost unit, a driving unit, a power execution unit, a sampling unit and a current acquisition, amplification and comparison unit, the power supply and signal isolation unit inputs and outputs I / O signals, and the power execution unit and the sampling unit respectively input / output power electricity. According to the utility model, through external equipment power supply and related I / O interface control, the power execution device can be controlled to connect and disconnect the power loop, when the current of the power loop reaches a preset short-circuit current value, after automatic short-circuit protection self-locking of the circuit, a short-circuit fault signal is output to the outside, and the outside can control related I / O to unlock the fault according to the fault signal, so that the fault is prevented from being damaged. And after an unlocking fault occurs, the loop can be controlled to be switched on again, so that the reliability of the load driving control system is improved, and power supply and distribution tasks in the power distribution control system can be safely and reliably completed.

A short-circuit protection circuit of a half-bridge driving chip relates to the field of short-circuit protection and integrated circuit design, and comprises a pre-driving module for generating a high-side signal and a low-side signal; the half-bridge module is driven, a high-side MOS receives a high-side signal, and a low-side MOS receives a low-side signal; the gate source hardware clamping module is used for carrying out voltage clamping on the high-side MOS when over-current of the over-ground short circuit of the high-side MOS is detected; the phase voltage short-circuit protection module is used for controlling the overcurrent time when the high-side MOS short circuit is over-current, and sending a fault signal to the logic module when detecting that the high / low-side MOS short circuit is over-current; the bus over-current protection module is used for sending a fault signal to the logic module when bus over-current is detected; and the logic module judges whether the short-circuit protection circuit enters a protection state according to the fault signal. According to the invention, the response speed and the protection mechanism are intelligently switched in real time in different overcurrent fault scenes through the three-stage protection circuit, and the circuit has the characteristics of high sensitivity, fast response speed and strong anti-interference capability.

The utility model provides a battery short-circuit protection circuit, a battery cluster and a parallel system. The battery short-circuit protection circuit comprises a switch power module, a current acquisition module, a voltage amplification module, a reference power supply module, a voltage comparison module, an AFE chip and a microcontroller. The current acquisition module acquires the current of the switching power module and converts the current into a voltage signal, the voltage signal is input into the voltage amplification module for amplification, and then the voltage signal and the output voltage of the reference power supply module are input into the voltage comparison module for comparison, and the output is used as the input of the microcontroller; the microcontroller outputs a corresponding control signal to control the turn-off of a switch in the switch power module; meanwhile, the voltage signal is input to the AFE chip, and the AFE chip outputs a corresponding control signal to control the on and off of a switch in the switch power module. According to the battery short-circuit protection circuit, the battery cluster and the parallel system, a double short-circuit protection function can be realized, and rapid protection and comprehensive protection can be realized, so that a battery cell and a switch tube are prevented from being damaged.

Certain aspects of the present disclosure provide techniques and apparatus for supplying power, including short circuit protection. One example power supply circuit generally includes a switching regulator including an output coupled to a first power supply node, a battery node for coupling to a battery, a switch coupled between the first power supply node and the battery node, a first transistor including a gate coupled to the first power supply node and a source coupled to a reference potential node of the power supply circuit, and a first current source or a resistive element, coupled between a power supply rail and a drain of the first transistor. The power supply circuit may be configured to detect a short circuit on the first power supply node and trigger an automatic fault protection (AFP) mode after completion of a soft start of a voltage on the first power supply node.

The utility model belongs to the technical field of protection circuits, and particularly relates to a short-circuit protection circuit and a refrigerant recycling machine power supply circuit. In order to overcome the defect that when the output of one LDO is short-circuited, the outputs of the other LDOs are also influenced in the existing refrigerant recycling machine powered by multiple LDOs, the utility model adopts the following technical scheme: the short-circuit protection circuit comprises an instantaneous pulse enabling unit, a short-circuit protection unit, a short-circuit protection unit and a short-circuit protection unit, a long-time self-locking unit; a self-locking and short-circuit control unit; a short circuit protection unit; the self-locking and short-circuit control unit is connected to the short-circuit protection unit, and a high-voltage electrode of the long-time self-locking unit is connected to an output electrode of the short-circuit protection unit; when the instantaneous pulse enabling unit is conducted, the self-locking and short-circuit control unit, the short-circuit protection unit and the long-time self-locking unit are all conducted; and when the output electrode of the short-circuit protection unit is short-circuited, the long-time self-locking unit, the short-circuit control unit and the short-circuit protection unit are all cut off. The beneficial effects of the utility model are that the circuit is automatically disconnected when short circuit occurs, and a protection effect is achieved.

The invention discloses a grid drive short-circuit protection method based on dV / dt detection, which relates to the technical field of power electronics, and comprises the following steps: constructing a unified time frequency reference baseline, executing all-phase mapping on each power device of a parallel system, reconstructing a conduction sequence, and calculating a phase difference between a voltage rising edge and sampling trigger. Generating a time frequency dislocation matrix, and determining a phase dislocation risk window; and executing causal playback in the phase dislocation risk window, extracting transient waveform characteristics of a voltage rising edge, eliminating parasitic pseudo peaks, obtaining an effective response trajectory, generating a sampling phase check anchor point based on the trajectory, and constructing a phase reference baseline. According to the method, a unified time-frequency baseline and a dynamic sampling mechanism are constructed to realize phase synchronization of sampling and conduction, the sampling rhythm and the turn-off threshold are optimized in combination with feed-forward vibration suppression and residual adjustment, the short circuit identification speed and precision are improved, and the method has self-healing and self-correcting capabilities and is suitable for high-frequency and high-power density scenes.