2872 results about "Cut-off" patented technology

Provided in the present invention is an interference-factor-based high-safety and stable control method for an onboard magnetically suspended flywheel battery system. The method comprises: in the case of a safe operating condition interference, obtaining the difference between a displacement reference signal and an actual displacement signal, and inputting the difference into a Butterworth-filter-fused fuzzy active disturbance rejection control module, so as to obtain control currents, wherein the control currents comprise a radial control current, a torsion control current and an axial control current; the radial control current and the torsion control current are subjected to Clark inverse transformation, and the axial control current is subjected to power amplification, and the three currents are then compensated for, such that a three-phase control current of a radial coil, a three-phase control current of a torsion coil, and a control current of an axial coil are obtained; the control currents control the corresponding coils, and are also input into a multi-information extended Kalman filtering prediction module, such that the actual displacement signal is output; and in the case of a dangerous operating condition interference, cutting off an output signal from an operating condition recognition and safety determination module. The present invention can improve the stability, robustness and anti-interference capability of a system.

The invention provides an excitation fuse with active and passive integrated protection and a related device. The excitation fuse is applied to a protected circuit. The active and passive integrated protection excitation fuse comprises a fuse shell, an impact device, a first melt, a second melt, a first conductor, a second conductor and at least one excitation source, the excitation fuse is connected in series in a protected circuit through the first conductor and the second conductor; the first melt and the second melt are connected in parallel between the first conductor and the second conductor; when the voltage of the first melt is higher than the trigger voltage of any excitation source in the at least one excitation source, the corresponding excitation source is triggered to release high-pressure gas into the penetrating cavity; or any excitation source in the at least one excitation source releases the high-pressure gas into the penetrating cavity when receiving the control signal of the control circuit; and then the impact device is pushed to impact the first melt and / or the second melt along the movable cavity so as to cut off the first melt and / or the second melt.

The invention discloses a power-on reset circuit, and relates to the technical field of integrated circuits, in order to eliminate static power consumption of the power-on reset circuit and reduce power consumption of the power-on reset circuit, the power-on reset circuit comprises a discharge delay circuit, a current mirror circuit and a buffer circuit; the discharge delay circuit comprises a capacitor and an NMOS (N-channel Metal Oxide Semiconductor) tube M4, and the NMOS tube M4 is used for discharging the capacitor; the current mirror image circuit comprises an NMOS tube M2, an NMOS tube M3 and a PMOS tube M9. The grid electrode of the NMOS tube M2 and the grid electrode of the PMOS tube M9 are respectively connected with the output end of the buffer circuit; the grid electrode of the NMOS tube M3 is respectively connected with the source electrode of the PMOS tube M9, the drain electrode of the NMOS tube M2 and the grid electrode of the NMOS tube M4; the current mirror image circuit is used for turning off the NMOS tube M2 after the reset signal is ended, and pulling up the drain electrode voltage of the NMOS tube M3 to the power supply voltage through the PMOS tube M9, so that the NMOS tube M3 enters a deep linear region, and a direct current path from the power supply to the ground in the current mirror image circuit is cut off; and the buffer circuit is used for outputting a reset signal according to the voltage change of the capacitor in the discharge delay circuit.

The invention provides a semiconductor device with a PN junction and a preparation method thereof, and belongs to the technical field of semiconductor devices. The semiconductor device comprises a silicon substrate, the surface of one side of the silicon substrate in the thickness direction is provided with an emitter region covering an emitter and an isolation region formed by removing the emitter, a PN junction is formed between the emitter and the silicon substrate, the isolation region is arranged at the edge of the silicon substrate, and at least one side wall of the silicon substrate in the length direction is provided with a cutting surface. An isolation region is arranged at least close to the edge of the cutting surface in the silicon substrate, the surface height of the isolation region is lower than that of the emitter region, the isolation region and the emitter region are connected through a buffer region of a slope structure, and passivation layers cover the surfaces of the emitter, the isolation region and the buffer region. According to the invention, the structure of the isolation region is optimized, a transmission channel of carriers from the emitter region to the cutting surface is effectively cut off, and uniform coverage of the passivation layer is ensured, so that the performance of the device is optimized.

The invention belongs to the field of overvoltage protection, and relates to an overvoltage stabilizing and protecting device which comprises a data acquisition operation module, a control logic module, a display module, an overvoltage protecting assembly and a high-voltage vacuum circuit breaker or an electric isolation handcart structure. The real-time monitoring and protection of the working state of the overvoltage protection assembly are realized; through the arrangement of the high-voltage circuit breaker or the electric isolation handcart, when the overvoltage protection assembly is detected to be abnormal, the connection between the overvoltage protection assembly and the high-voltage bus can be rapidly cut off, so that the system safety is ensured; the device integrates a transient fault recording function and can capture wave map data before and after a power frequency overvoltage fault of the system; the overvoltage protection assembly in the device adopts a geometric center air cooling heat dissipation mode, the fan is quick in starting response, the operating temperature of the overvoltage protection assembly is greatly reduced, the operating time of the overvoltage protection assembly can be effectively prolonged, and the device adopts an integrated modular structural design, so that the operation safety, the maintenance and the management are greatly facilitated.

The invention discloses a remote ignition control system for a release flare, and relates to the technical field of release flare control, the system comprises the following components: a fault detection module, a fault isolation module, a standby module, a redundant circuit switching module, a fault diagnosis module and a wireless communication module; by integrating multiple modules of fault detection, fault isolation, standby module and redundant circuit switching, fault diagnosis and wireless communication, comprehensive remote monitoring and management of the release flare ignition control system are achieved, when the system detects a fault, electrical connection of a fault component can be rapidly cut off, and the safety of the release flare ignition control system is improved. And the standby module or the redundant circuit is automatically switched, so that the continuous and stable operation of the system is ensured, the reliability and the safety of the system are remarkably improved, and the risk of production interruption caused by faults is reduced.

The invention relates to the technical field of power system fault protection, in particular to a power distribution network distance protection method, system and device considering distributed power supply negative sequence currents, and aims at a medium-voltage power distribution network where a plurality of distributed power supplies are connected in a feeder line T-connection mode. Considering the influence of negative-sequence current output under negative-sequence current control of a distributed power supply in each feeder line on measured impedance, the feeder line with a two-phase short-circuit fault in the power distribution network is identified and positioned through cooperation of additional impedance compensation and distributed power supply negative-sequence reconstruction control, and then a protection device is controlled to cut off the fault feeder line. And implementing distance protection of two-phase short circuit of the power distribution network. The method realizes fault identification and positioning only by depending on locally acquired electrical quantity parameters, does not need to depend on a communication system, considers and ensures autonomy and reliability of distance protection, has the advantages of simple principle, low cost and high reliability, and can adapt to power distribution networks with different fault positions and different distributed power supply access numbers and capacities.

The invention relates to the technical field of transmitters, and discloses an intelligent monocrystalline silicon pressure difference transmitter which comprises a sensor, diaphragms are arranged on the left side and the right side of the sensor, a first process flange is installed on the front side of the sensor, a second process flange is installed on the rear side of the sensor, and a machine body is fixedly connected to the upper surface of the sensor. A displayer is installed on the front side of the machine body, the sensor is electrically connected with the machine body, and an overload plugging device is arranged on the inner wall of the second process flange. The overload plugging device comprises a U-shaped guide frame, the U-shaped guide frame is installed on the inner wall of the second process flange, and the inner wall of the U-shaped guide frame is connected with a connecting rod in a sliding mode. According to the invention, through the arrangement of the overload plugging device, the interface part can be cut off when the tested pressure end of the transmitter is subjected to overlarge instantaneous pressure, so that the impact of the instantaneous pressure on the diaphragm of the tested pressure end is reduced, and the protection performance of the transmitter on the large instantaneous pressure is improved.

The invention discloses a multiband high-voltage power supply control system and a normalization control and protection method thereof, and relates to the technical field of power supply control, and the method comprises the steps: collecting multi-mode signals of S, C and Ku band high-voltage power supply systems and a cooling system; an SDAE deep network and an integrated learning AdaBoost framework are combined to construct a fault diagnosis model, and a fault type and confidence are obtained according to signal features; when a fault occurs, high-voltage output of a corresponding power supply unit is cut off and reported through an isolation interface, and a deep reinforcement learning agent is used for carrying out protection action intelligent decision making; a digital twinborn model of a power supply unit is constructed, an improved grey wolf optimizer is used for multi-task collaborative optimization, optimized system parameters are acquired and issued to a PLC for execution, and waveband output stability is ensured. According to the invention, high reliability, rapid response and intelligent operation and maintenance of the multi-band high-voltage power supply system are realized through deep integration of multi-source signal acquisition, intelligent fault diagnosis, adaptive protection decision and digital twinning optimization.

The invention relates to the technical field of power distribution automation auxiliary power supply control, and discloses an intelligent power distribution circuit system for a digital ring main unit, which comprises a transient voltage gradient induction bridge circuit, a hardware signal processing circuit, a power switch unit and a controlled energy release unit, according to the system, a transient voltage gradient induction bridge circuit is used for collecting a primary side bus voltage change rate signal, a hardware signal processing circuit carries out derivation operation on an induction signal and compares the induction signal with a voltage gradient threshold value, and a power switch unit is blocked at the moment that the voltage abnormally drops so as to cut off a load current path. According to the invention, a hardware parameter direct mapping mechanism is utilized to realize microsecond transient protection response, and the physical decoupling of protection logic and digital software is realized by balancing bus potential pulse caused by sudden unloading of a load through the inherent dehumidification resistor in the multiplexing cabinet.

The invention provides a fault-tolerant control method and a fault-tolerant control system for a dual-active bridge series resonant converter (DBSRC), and aims to solve the problems that the voltage and current stress is increased, the system reliability is reduced and the like caused by an open-circuit fault of a primary side switch tube or a secondary side switch tube. Through the dynamic reconstruction modulation strategy and the same bridge arm driving follow current suppression method, under the condition that redundant hardware is not needed, the voltage and current stress in the fault state is effectively reduced, and stable operation of the system is maintained. The method specifically comprises the following steps: when a primary side open-circuit fault occurs, optimizing a control parameter by adopting extended phase shift modulation (EPS), and compensating for loss of a power transmission path; and when the secondary side has an open-circuit fault, the driving signal of the other switching tube of the same bridge arm is cut off, and the direct-current bias of the resonance current is eliminated. According to the method, the fault-tolerant capability of the DBSRC is remarkably improved, the hardware cost and the maintenance complexity are reduced, and the method is suitable for a high-frequency isolation direct-current conversion system.

The invention provides an intelligent socket control system and method based on an overvoltage and undervoltage protector, and relates to the technical field of intelligent socket control. Load bias utility of an intelligent socket under different working conditions is extracted, load attribute identification is performed on voltage state information, and a load identification tag of a load side in an intelligent socket access circuit is generated; determining a voltage out-of-limit level of the voltage at the front end of the intelligent socket in an overvoltage and undervoltage state; after the dissimilatory breaking criterion is executed to cut off a load power supply loop, a reset response strategy corresponding to the voltage at the front end of the intelligent socket is generated, and then a tolerance adaptation rule of the voltage at the front end of the intelligent socket when the overvoltage and undervoltage fault is removed is determined; and performing adaptive resetting on the power supply planning table of the power supply state in the current intelligent socket access circuit according to the voltage out-of-limit level and the tolerance adaptation rule. According to the invention, differentiated adaptive control can be carried out on load power supply under the activation of an overvoltage and undervoltage protection mechanism, so that the adaptability of the intelligent socket to complex working conditions is improved.

A high-linearity grid voltage bootstrap circuit relates to the technical field of analog-to-digital conversion and comprises a first charge pump boosting unit, a second charge pump boosting unit and a grid voltage bootstrap unit, working states of a sampling switch are divided into a sampling state and a holding state, an input voltage VIN is boosted to a VG through the grid voltage bootstrap unit in a sampling stage, and the sampling switch is switched on; and the holding stage sampling switch is cut off, and charges are injected to the upper polar plates of the capacitors C3 and C4 of the gate voltage bootstrap unit through the first charge pump boosting unit and the second charge pump boosting unit respectively. According to the invention, the problem that the actual gate-source voltage is reduced due to the grid parasitic capacitance of the sampling switch is solved, and the layout area occupation is greatly reduced while the bootstrap voltage is improved; the proportion of the capacitor C3 and the capacitor C4 can be flexibly set to obtain the required bootstrap voltage; and the problem that the on-resistance of the sampling switch is increased due to the reduction of the gate-source voltage can be solved, and the linearity of the sampling switch is improved.

The invention provides an intelligent fuse, and belongs to the technical field of circuit protection, and the intelligent fuse is characterized in that an upper housing is provided with at least one excitation chamber, the excitation chamber is internally provided with at least one excitation part and at least one impact part, and the excitation part releases high-pressure gas when receiving any one of an external trigger signal and an internal trigger signal; the lower shell is provided with at least one cooling cavity; the current-conducting plate is arranged between the upper shell and the lower shell, and the impact part moves towards the direction where the cooling cavity is located under the thrust action of the high-pressure gas so as to cut off the current-conducting plate; the self-control module is arranged outside the shell and comprises a current detection unit and a processing unit, and the current detection unit is used for detecting a current signal on the conductive plate; the processing unit is used for generating an internal trigger signal according to the current signal. The beneficial effects of the invention are that a dual-trigger mechanism and redundancy design of an internal trigger signal and an external trigger signal are adopted, so that normal action can still be ensured when any signal fails, and the breaking reliability is improved.

The invention relates to the technical field of power system protection, in particular to an underground power distribution network single-phase grounding protection system and method based on a signal injection method. The system comprises a signal acquisition module, a measurement and control protection module and an online monitoring module. According to the invention, by injecting the independent direct current signal and combining a zero-sequence fundamental wave time sequence identification algorithm and a traveling wave distance measurement method, rapid detection, high-precision positioning and selective protection of the single-phase earth fault of the underground low-voltage power distribution network are realized, and the method is suitable for complex environments such as coal mines and metal mines; through insulation value on-line monitoring and electric leakage protection, the ground insulation value level of a line is reflected to the voltage change of an additional direct current signal and a reactor neutral point. A zero-sequence fundamental wave time sequence identification model is adopted for electric leakage fault judgment so as to judge the fault type. By outputting a relay signal, on-off control is performed on a protected branch, so that a fault line can be quickly cut off when a fault occurs, and equipment and a bus are protected from being damaged by the fault.

The invention provides a gate driving device and a display panel, and relates to the technical field of display driving. The gate driving device comprises a cascade transmission circuit, a first frequency dividing circuit and a first output circuit. Wherein the cascade transmission circuit is connected with a first node and used for controlling the potential of the first node according to a cascade transmission signal, and the first frequency dividing circuit is used for controlling the potential of a second node according to the potential of the first node and a first frequency dividing signal transmitted by a first frequency dividing line; the first output circuit comprises a sixth transistor; and when the first node is in a low level state, the potential of the second node is maintained above a preset threshold voltage, so that the sixth transistor is cut off or conducted in a linear region. When frequency division switching needs to be carried out, even if the second node is in a passive high-level state, and the first node is in a low-level state, the potential of the second node is maintained above a preset threshold voltage, so that the sixth transistor is cut off or conducted in a linear region, and display abnormity caused by output abnormity of a first gate driving signal during frequency division switching is avoided.

The invention discloses a virtual reactive power plant user single-phase asynchronous motor reactive power regulation method, and relates to the technical field of electrical equipment control, and the method comprises the steps: collecting the real-time state data of a key node of a power distribution network, and building a short-term prediction model based on the state data; setting a judgment condition according to a prediction result of the model, generating a preliminary reactive power regulation instruction, and adjusting the priority and the regulation amplitude of the preliminary reactive power regulation instruction in real time based on dynamic updating of a prediction trend; issuing the adjusted reactive power adjustment instruction to a user terminal, and performing cooperative processing based on distributed coordination control to generate a final cooperative adjustment instruction; executing an action of cutting off the split-phase capacitor of the single-phase asynchronous motor according to the coordinated adjustment instruction; according to the invention, the split-phase capacitance of the single-phase asynchronous motor at the user side is regulated and controlled by using the virtual reactive power plant, so that low-cost, quick-response, continuous and accurate reactive power regulation is realized, and the problems of reactive power excess and high voltage of a power grid are effectively solved.

The invention relates to the technical field of charging pile control, and discloses a charging control method for a wall-mounted shared charging pile, and the method comprises the steps: providing electric energy for to-be-charged equipment under charging parameters; collecting charging data of each charging pile according to a first collection period; whether an abnormal charging pile exists or not is judged, and a first collection period of charging data of the abnormal charging pile or charging parameters are adjusted according to the abnormal proportion; the predicted charging data comprises predicted voltage and predicted current; and whether the charging process is abnormal or not is determined through the predicted charging data and the next abnormal charging data, early warning is given out based on the judgment result of charging abnormity, and charging output of the abnormal charging pile is cut off. According to the method, the safety and the stability of the charging process are remarkably improved, the energy consumption is reduced through an intelligent dynamic adjustment strategy, and the reliability of the shared charging service and the user experience are greatly improved.

Disclosed in the present invention is a ground fault device end-of-life self-test system. An induction coil and a neutral coil are used for sensing and acquiring a ground fault leakage current signal of a live wire or a neutral wire. A trip device is used for cutting off the power supply to a load in the event of a ground fault by driving a solenoid by means of a thyristor which is triggered by an IC1 to turn on. A manual test button is used for manually testing the function of a ground fault device. A rectifying circuit is used for rectifying an alternating current (AC) and outputting same to a direct current, and providing the direct current to IC1 and IC2 direct current power supplies. A ground fault detection circuit is used for completing ground fault detection, and controlling the drive to trigger the thyristor to turn on or off. A ground fault self-test control circuit is used for controlling the testing of a ground fault detection function without affecting normal ground fault detection and protection functions.

The present invention relates to a leakage detection method for a distribution box, and the technical field of leakage of distribution boxes includes the following steps: S1: real-time acquisition of current signals of each line in the distribution box, using a current transformer or a Hall effect sensor to acquire data; S2: using an adaptive sensitivity adjustment algorithm to automatically adjust the threshold of leakage detection according to real-time environmental parameters and historical data; S3: fast Fourier transform processing of the collected data; S4: when a suspected leakage event is initially detected, a secondary verification procedure is immediately started; S5: after confirming the leakage, the power supply is quickly cut off and an alarm message is sent to a user terminal. The present invention maintains optimal sensitivity and accuracy under different working conditions, avoiding the problem of missed detection or false alarm that may be caused by the traditional fixed threshold method in a complex environment.

The utility model provides a controllable electromagnetic release and a miniature circuit breaker, and relates to the technical field of circuit breakers, in order to solve the problem of rapid opening of an intelligent miniature circuit breaker in the prior art, the controllable electromagnetic release comprises a sleeve, a magnetic pushing mechanism, a first coil, a control circuit and a second coil, the first coil and the second coil are wound on the outer side of the sleeve respectively, the two ends of the first coil are connected to a load circuit, the two ends of the second coil are connected with the control circuit, when the load circuit is short-circuited, the first coil drives the magnetic pushing mechanism to cut off a power supply loop, and when the load circuit is short-circuited, the magnetic pushing mechanism drives the magnetic pushing mechanism to cut off the power supply loop. And when the control circuit controls the second coil to be electrified, the magnetic pushing mechanism cuts off the power supply loop. The controllable electromagnetic release can realize active quick release, and is minimum in occupied space and low in cost.

The invention provides a combined full-range controllable protection device, which belongs to the technical field of circuit protection and comprises a trigger body, a breaker and a fuse. The trigger body and the breaker are connected in series, and the trigger body and the breaker which are connected in series are connected in parallel with the fuse; when the circuit is abnormal, the trigger body is fused to carry out primary protection on the circuit, the fused trigger body also generates an electric signal and transmits the electric signal to the breaker, the breaker cuts off the circuit to carry out secondary protection on the circuit, current flowing through the trigger body and the breaker is merged into a branch where the fuse is located, and the fuse is fused to form third-level protection on the circuit; therefore, multi-stage protection is realized through the trigger body, the breaker and the fuse, and the time sequence cooperation of multi-stage protection actions not only avoids misoperation, but also can provide redundancy protection when a serious fault occurs, so that quick response and reliable cut-off when the circuit is abnormal are realized on the basis of keeping low loss when the circuit is normal, and the circuit breaker can be suitable for high-voltage and large-current breaking.

The invention relates to an intelligent identification and conversion control method for a charging interface of a multi-standard charging pile in the field of new energy automobiles, and the method comprises the steps: carrying out the mode matching analysis of interface physical feature data and communication signal feature data, and obtaining a preliminary classification result of the type of a charging interface device; according to the loading result of the communication configuration parameters, obtaining a confirmation feedback signal of successful protocol switching; judging whether the load demand data conforms to a rated output power range of a charging interface device or not; according to the authorization instruction, current intensity data including a peak value and an average level and voltage level data including a fluctuation amplitude in the charging process are monitored in real time; if the current intensity data or the voltage level data exceed a preset safety threshold value, power supply connection is disconnected, and a circuit path is cut off; and generating a power-off record log containing abnormal fluctuation data and a power-off moment according to a result of disconnecting the power supply connection.

The invention relates to a power grid power supply distribution box capable of locking intelligent power connection and a locking power connection method thereof, and the power grid power supply distribution box comprises a driving part which is installed on a second box door, is provided with a gear cylinder, and is used for driving the gear cylinder to transversely move and intermittently rotate; and the lifting piece is arranged on the second box door through a guide block and is connected with the gear cylinder. According to the invention, when the second box door is opened, the door magnetic switch can automatically disconnect the circuit to trigger the conduction of the opening loop, and this operation enables the circuit breaker to trip to cut off the power supply in the distribution box; through the mode, all branch switches in the distribution box can be switched off step by step according to a certain sequence under the action of the step-by-step locking structure, so that safe power failure can be realized during power connection; by means of the step-by-step power-off operation design, large-scale power cut-off can be effectively avoided, and equipment damage caused by current impact or voltage fluctuation is reduced.

The embodiment of the invention discloses a semiconductor device, a manufacturing method, a power module, a power conversion circuit and a vehicle. The semiconductor device includes a semiconductor body including a first surface, a second surface, a first device region, and a second device region; the first device region comprises a well region, a first region and a channel layer, and the first region is in contact with the channel layer; a gate trench; a first insulating layer; a first trench located in the second device region; the second device region further comprises a second insulating layer and a filling layer; a trench gate; an interlayer insulating layer; a Schottky metal layer; a drain electrode; and a source electrode. According to the technical scheme of the embodiment of the invention, the depletion type semiconductor device is formed and is in a conducting state and a cut-off state in a normal state, negative voltage needs to be applied between the grid electrode and the source electrode to cut off the channel, the response can be faster, the current circulation can be controlled, and the conducting loss is smaller. And a Schottky structure is integrated, so that the forward conduction voltage drop of the device is reduced, and the energy loss of the device in a reverse follow current state is reduced.

The invention relates to the technical field of circuit breakers, and discloses a fast-to-install primary and secondary fusion pole-mounted circuit breaker which comprises an installation frame and a circuit breaker body arranged on the installation frame, and core power electronic components such as an insulated gate bipolar transistor (IGBT) chip and a module are integrated in the pole-mounted circuit breaker body. The mounting rack is used for mounting a circuit breaker body to realize the functions of automatically cutting off a circuit and remote communication when a fault occurs, the mounting rack comprises a clamping assembly and a supporting piece, the supporting piece is used for mounting the circuit breaker body, and the clamping assembly is used for fastening the supporting piece on a telegraph pole. According to the pole-mounted circuit breaker, assembling and wiring of the circuit breaker body are completed on the ground firstly, then the circuit breaker body is rapidly fixed to the telegraph pole through the installation frame, the effect of improving the installation efficiency and reliability of the pole-mounted circuit breaker is achieved, and meanwhile the use flexibility of the installation frame is high.

The invention discloses a primary and secondary fusion complete column-mounted circuit breaker, relates to the technical field of circuit breakers, aims to solve the technical problem that a chemical arc extinguishing mode cannot perform good arc extinguishing work in part of environments, and comprises a mounting frame body, a current monitoring mechanism and a plurality of arc extinguishing mechanisms. Through the design structure of the arc extinguishing mechanism, the elastic force provided by the elastic assembly is larger than the rebound magnetic force of the movable contact assembly and the magnetic induction assembly in a normal power-on state, so that the top end of the movable contact assembly and the bottom end of the magnetic induction assembly are connected in an inserted mode to form a circuit; the elastic force provided by the elastic assembly is smaller than the rebound magnetic force of the movable contact assembly and the magnetic induction assembly, the top end of the movable contact assembly slides to the position below the insulation cutting blocks, the insulation cutting blocks are tightly connected to form a fully-closed arc extinguishing structure, electric arcs are cut off, an open circuit is formed, and the device can be used in high-altitude areas. The technical problem that a chemical arc extinguishing mode cannot carry out good arc extinguishing work in part of environments is solved.

The invention discloses a nanosecond high-voltage steep pulse generator, which relates to the technical field of high-voltage pulses and comprises a microcontroller, a Marx circuit, a trigger control module, an isolation high-voltage driving module, a safety module and a power management module, the microcontroller comprises a main chip, and parameters of the output end of the Marx circuit are collected in real time through the microcontroller. The trigger control module generates a nanosecond synchronous trigger signal; the isolation high-voltage driving module converts a low-voltage signal of the microcontroller into a high-voltage driving signal; the safety module is used for monitoring the state of the system, immediately cutting off a trigger signal when a fault occurs, and protecting the Marx circuit and the microcontroller; according to the invention, the microcontroller is used for generating synchronous trigger pulses and accurately triggering charging and discharging of the capacitor of the Marx circuit, and the high-speed ADC arranged inside can accurately control and detect voltage balance, trigger signals and fault protection.

The invention provides an electromagnetic compatibility test system for an integrated circuit, a part or a whole vehicle. The system comprises an interference signal injection or receiving device, a test board, an oscilloscope, an upper computer, a power supply and an isolation communication device, the interference signal injection or receiving device is used for sending a quantitative interference signal to the test board or receiving and measuring the size of the interference signal of the test board; the test board is used for bearing a tested integrated circuit and carrying out an electromagnetic compatibility test according to a working state specified by the upper computer; the isolation communication device is used for performing photoelectric conversion on a control signal and a monitoring signal corresponding to the electromagnetic compatibility test to form photoelectric isolation; the oscilloscope is used for measuring the waveform of the monitoring signal; and the upper computer is used for controlling the test process and analyzing the monitoring signal to judge the test result. The isolation communication device is used for cutting off electrical connection between the test board and the upper computer and the oscilloscope, it is ensured that the test board is not affected by the outside in the electromagnetic compatibility test process, and the accuracy of the electromagnetic compatibility test is improved.

The invention relates to the field of load control, in particular to a non-fixed load accurate removal method based on load control fairness and effectiveness consideration. Comprising the following steps: acquiring the frequency of a power grid system, calculating the frequency change rate, judging whether to send a'preparation for load shedding 'instruction to all substations by monitoring the frequency of the power grid system and the frequency change rate, entering a load shedding amount calculation stage, and calculating the load amount needing to be cut off in each region through a dynamic weighted load precise cutting algorithm, calculating a total load shedding amount; based on the load capacity needing to be cut off in each area, the substation optimizes the cut-off combination of the load lines in the areas, after optimization is completed, the substation executes cut-off, and the master station monitors the frequency and the frequency change rate of the power grid system after cut-off and judges whether a locking condition is met or not so as to stop further cut-off. The technical problems that power grid frequency monitoring mostly depends on low-sampling-rate equipment, the rapidly-changing frequency dynamic state is difficult to capture, and instability detection lags or misjudgments are caused are solved.