538 results about "Current switch" patented technology

The invention discloses a three-port soft switching optical storage servo all-in-one machine based on device multiplexing and a modulation method. The all-in-one machine comprises a DC-AC servo driver, a low-voltage DC energy storage module, an auxiliary unit, a bus capacitor and a photovoltaic module. The DC-AC servo driver comprises three bridge arms, and each bridge arm is provided with a bridge arm upper tube and a bridge arm lower tube; the low-voltage direct-current energy storage module comprises an energy storage battery, an energy storage switch tube S7 and a direct-current energy storage inductor; the photovoltaic module comprises a photovoltaic power generation panel, a photovoltaic inductor, a photovoltaic switch tube S8 and a diode D1; the auxiliary unit comprises an auxiliary switch tube Sa, an auxiliary resonant inductor Lr and an auxiliary capacitor Cr. According to the invention, an integrated resonant soft switching architecture is innovatively adopted, zero-voltage / zero-current switching of all power switching devices is realized, and the problem of loss caused by a traditional hard switch is thoroughly solved; and by optimizing a device multiplexing technology, the number of switching tubes is greatly reduced while the soft switching performance is ensured, so that the system efficiency is improved in a breakthrough manner.

A switch-mode power supply is used to provide an output voltage and includes an inductor and a power switch, where the power switch is used to control the current flowing through the inductor. A control method for the switch-mode power supply includes: providing a compensation signal controlled by the output voltage; providing a stable compensation signal for the low-frequency component of the compensation signal based on the compensation signal; providing a mixed operation mode, in which the switch-mode power supply alternately operates during a switching operation period and an skip period, the power switch opens at least once during the switching operation period, and the power switch is closed during the skip period; based on the difference between the compensation signal and the stable compensation signal, ending one of the switching operation period and skip period, and starting another one of the switching operation period and skip period.

The invention discloses a CMOS analog multiplier circuit, the circuit comprises a current-to-voltage circuit and a multiplier sub-circuit connected with the current-to-voltage circuit, an OSC circuit in the multiplier sub-circuit receives an input voltage VB and a reference voltage VREF and generates a two-phase non-overlapping clock signal group, a voltage-to-current A circuit converts a voltage VA into a current iA, and the current iA is connected with the OSC circuit. The switched capacitor integrating circuit inputs a sampling voltage to the voltage-to-current B circuit and integrates a difference current is of a current iA and a current iB to realize multiplication, the voltage-to-current B circuit converts a sampling voltage signal into the current iB, and the current-to-voltage circuit converts the current iB into an output voltage Vo as a multiplier operation result. Through combination of modular design, a current mode method and a switched capacitor method and high-precision current conversion and integration processes, an efficient and accurate multiplication simulation function is realized, a THD enhancement function is introduced through multiplexing design, and circuit performance is further optimized.

The invention provides a totem pole PFC circuit control method and a power conversion device. The totem-pole PFC circuit comprises a first inductor, a first bridge arm and a second bridge arm, the first bridge arm and the second bridge arm are connected in parallel between the positive electrode and the negative electrode of the DC interface of the totem-pole PFC circuit, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor and the midpoint of the second bridge arm are used for being connected with an AC power supply. The method comprises the following steps: controlling switch tubes of a first bridge arm and a second bridge arm to be closed within a first duration starting from a first moment before each zero-crossing moment of an alternating current power supply, and controlling a main switch tube of the first bridge arm to work within a second duration starting from a second moment after the zero-crossing moment, the follow current switch tubes of the second bridge arm and the first bridge arm are controlled to be closed; wherein the last moment of the first duration is the second moment. According to the control method provided by the invention, the leakage current of the power conversion device comprising the totem-pole PFC circuit can be effectively reduced.

The invention relates to the field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a circuit breaker. An existing circuit breaker is improved, a brand-new solid-sealed polar pole is adopted, and high-pressure gas is compressed and generated in the opening and closing process of the solid-sealed polar pole by means of linear motion of a transmission rod in the opening and closing process of the solid-sealed polar pole and an air cylinder in transmission connection with the transmission rod; high-pressure gas is subjected to heat dissipation through the heat dissipation pipe section of the slow-release exhaust pipeline, and then low-temperature high-pressure gas is continuously blown into the heat dissipation gas cavity through the slow-release exhaust pipeline, so that heat exchange is carried out in the arc extinguish chamber in the heat dissipation gas cavity, high temperature generated in the opening and closing process of the arc extinguish chamber is taken away, and heat dissipation and cooling of the arc extinguish chamber are achieved. According to the novel solid-sealed polar pole, heat dissipation and cooling of the arc extinguish chamber are achieved by means of power provided by an operating mechanism in the opening and closing process, other cooling equipment does not need to be configured, the system structure is simplified, and energy consumption is reduced.

The invention discloses a formation and capacity grading parallel detection system based on a high-voltage direct-current bus. A press device comprises a direct-current switch and at least one set of pull-out type charging and discharging probe module. And the input end of the direct-current switch is connected with the output end of the PCS equipment. Each charging and discharging probe module adopts a pull-out structure and comprises a mechanical frame, and a high-voltage direct-current bus, a bidirectional conversion module and a probe assembly which are integrally mounted in the mechanical frame; the high-voltage direct-current bus input end is connected with the direct-current switch output end; the bidirectional conversion module comprises two stages of conversion units; the first conversion unit is used for reducing the first voltage of the high-voltage direct-current bus into the second voltage or reversely increasing the voltage; the second conversion unit reduces the second voltage to the voltage required by charging and discharging of the battery or boosts the second voltage; the probe assembly is connected to the output end of the second conversion unit. The system is compact in structure, high in charging and discharging efficiency and convenient to maintain, and cables are saved.

The invention relates to the technical field of power equipment testing, in particular to a high-voltage direct-current switch integrated equipment aging test platform which comprises a multi-dimensional interface adaptation module, a collaborative aging test module, an aging feature extraction module and a cyclic test control module. The multi-dimensional interface adaptation module realizes rapid access and standardization by acquiring device interface features and comparing and adjusting, cooperates with the aging test module to synchronously apply four stresses, obtains a dynamic acceleration factor quantitative acceleration effect through a coupling formula, the aging feature extraction module extracts related parameters, quantifies the degradation degree in combination with a dynamic weight formula, and finally obtains the aging test result. The cycle test control module adjusts the cycle index according to the acceleration factor and the degradation degree and in combination with the fluctuation amplitude, rapid equipment adaptation is achieved, the composite aging process can be accurately reproduced, the test process is dynamically optimized, the test standardization level, the consistency with the actual working condition and the test efficiency are remarkably improved, and the test efficiency is improved. And reliable technical support is provided for equipment aging characteristic evaluation.

The invention relates to the technical field of wireless charging, and particularly discloses a wireless electric energy transmission system for multi-split charging of an electric bicycle, which comprises a direct-current voltage source UD, a high-frequency inverter H, an alternating-current switch Si, a transmitting side LCC compensation network, a magnetic coupler, a receiving side LCC compensation network, a rectifier Di, a filter capacitor CFi and a battery load RBi, an alternating current switch Si, the transmitting side LCC compensation network, the magnetic coupler, the receiving side LCC compensation network, the rectifier Di, the filter capacitor CFi and the battery load RBi form an electric energy output channel, the output channel is connected with the high-frequency inverter H, and the output end of the rectifier Di supplies power to the battery load RBi through the filter capacitor CFi. The beneficial effects of the invention are that the system can achieve the automatic switching of a plurality of output channels from a constant current mode to a constant voltage mode under the condition of no detection and no special control circuit, improves the utilization rate of an inverter, saves an open circuit protection circuit, reduces the cost, and is suitable for the one-to-many charging application of electric bicycles of different specifications.

The invention relates to the field of data processing, in particular to a method and system for analyzing the health degree of main parts of a switch cabinet, and the method comprises the steps: analyzing the degradation influence of various events in the switch cabinet on parts through extracting historical data or other monitoring data and maintenance test data of the switch cabinet which can be used as a reference; and thus, a deterioration relation model of main parts in the switch cabinet is constructed. Monitoring data in the current switch cabinet are collected, and the degradation degree of main parts in the switch cabinet is evaluated by combining the degradation relation model. According to the method, the evaluation model is constructed based on the sample data, and the deterioration degree evaluation is performed on the main parts in the switch cabinet before the deterioration phenomenon occurs, so that the deterioration degree prediction can be performed before the deterioration phenomenon occurs on the parts, and guidance can be provided for replacement and maintenance of the parts so as to save maintenance resources.

The invention provides a modulation method used for a CLLC converter to realize bidirectional symmetrical power transmission, and the method comprises the steps: enabling the CLLC converter to work in an OP mode during reverse power transmission, and enabling the OP mode to comprise a P stage and an O stage: in the P stage, secondary side current is a negative value, the converter transmits reverse power, and the secondary side current enters the O stage after zero current switching is completed; in the O stage, the secondary side current becomes a positive value, a negative P mode is entered, and reverse power transmission is completed; during switching between the P stage and the O stage, a primary side 50% complementary square wave driving signal is used for control, it is ensured that the switching frequencies are the same during forward transmission and reverse transmission under the same voltage gain and opposite loads, and bidirectional switching of reverse power transmission and forward power transmission is achieved by adjusting the alignment edges of primary side driving signals and secondary side driving signals. According to the invention, the OP mode is introduced to replace the traditional NP mode to realize bidirectional power transmission, and the frequency modulation range of the CLLC converter is reduced.

The utility model provides a motor fault monitoring alarm. The motor fault monitoring alarm comprises a shell; the detection end of the current detection module is connected with the winding of the motor, and the current detection module is used for detecting the winding current of the motor; the switch module is connected to a power supply path of the motor in series, and the switch module is used for selectively conducting the power supply path of the motor; the input end of the processing module is connected with the output end of the current detection module, the output end of the processing module is connected with the input end of the switch module, and the processing module is used for sending out an alarm signal according to the winding current and controlling the on-off of the switch module. According to the motor fault monitoring alarm, an automatic motor monitoring mode is utilized, operation is simpler and more convenient, the accuracy is higher, the detection efficiency and quality of motor faults are effectively improved, the motor faults can be processed in time through the automatic monitoring mode, and then more serious safety accidents are avoided.

The invention relates to the technical field of power management, in particular to a two-way switching LDO framework suitable for an MCU sleep mode. Comprising a main LDO, an auxiliary LDO and a current detection circuit. The main LDO comprises a second error amplifier and a second adjusting tube; the auxiliary LDO comprises a first error amplifier and a first adjusting tube; the main LDO and the auxiliary LDO share the same voltage feedback network, and the voltage reference and the feedback output of the voltage feedback network are connected with the input end of the first error amplifier and the input end of the second error amplifier at the same time. The outputs of the first adjusting tube and the second adjusting tube are short-circuited and then are output to the MCU, and are simultaneously input to the input end of the voltage feedback network; the input end of the current detection circuit is connected with the output end of the first error amplifier, and the output end is connected with the current switch of the second error amplifier. The architecture provided by the invention meets the requirements of low power consumption and quick response of the MCU, and the power consumption of the architecture is not influenced by the power consumption of the MCU.

The invention discloses a magnetic suspension displacement device in a vacuum interconnection system. The magnetic suspension displacement device comprises a bearing table; the magnetic driving unit comprises a plurality of electromagnets which are arranged in an annular array, the plurality of electromagnets are divided into a plurality of groups, each group comprises two electromagnets which are collinear in the radial direction, the magnetic pole directions of the electromagnets are parallel to the radial direction, and the magnetic pole directions of the electromagnets in the same group are the same; the current switching mechanism is used for controlling the electromagnets to be sequentially switched on and off in the first direction, and the electromagnets in the same group are synchronously switched on and off to simulate rotation of the magnets to generate a balanced magnetic field; the sample table and the bearing surface are oppositely arranged at intervals; the stator is arranged in the sample table to generate a magnetic field repulsive to the balance magnetic field so as to suspend the sample table; the displacement driving unit is used for driving the bearing table to move. According to the invention, the sample table can be stably suspended and fixed at a position opposite to the bearing table, no mechanical vibration is generated, the switching frequency and the magnetic force are adjustable, the stability and controllability of the sample table in the start-stop state are improved, and the application is suitable for vacuum interconnection systems of wafer production lines with different sizes.

A power transmission device for wireless power supply to a mobile power receiving device has an edge coil unit that includes an edge resonance circuit, the edge resonance circuit including an edge coil and an edge resonance capacitors; an edge current switching unit; an edge transmission request signal receiving unit; an edge transmission control unit; an adjacent coil unit that adjacent to the edge coil unit and includes an adjacent resonance circuit; the adjacent resonance circuit including an adjacent coil and an adjacent resonance capacitor; and an adjacent current switching unit for switching on and off state of the power supply from the power source to the adjacent resonance circuit; and an adjacent transmission control unit that controls the on and off state of the power supply from the power source to the adjacent resonance circuit using the adjacent current switching unit.

The invention discloses a rapid spare power automatic switching device and method suitable for high-proportion distributed power supply access, and the device comprises a local sampling module which is used for collecting a local side bus voltage Ulocal and an incoming line current Ilocal; the switching value acquisition module is used for acquiring the TWJ state of the switch at the side; the communication module is used for communicating with an opposite-side remote transmission device through an HDLC protocol and acquiring opposite-side switch position information Kremote and an opposite-side voltage state Uremote; programmable logic is arranged in the logic processing module, and the logic processing module is used for executing comprehensive judgment logic; and the control output module is used for executing opening and closing operation of the switch according to the instruction of the logic processing module. Compared with a traditional spare power automatic switching technology, the method effectively solves the problems of operation refusal and maloperation caused by access of the high-proportion distributed power supply, and remarkably improves the power supply reliability and the new energy consumption capability.

An offshore wind power direct-current delivery system, which relates to the technical field of direct-current power transmission. The system comprises an onshore direct-current switching station, multiple offshore converter stations, and multiple onshore converter units; an alternating-current side of each offshore converter station is connected to a wind turbine set, and a direct-current side of each offshore converter station is connected, by means of a direct-current cable, to an input side of a bus bar of the onshore direct-current switching station; an input side of each bus bar is configured with a direct-current switch used to connect to a direct-current cable, an output side of each bus bar is connected to a direct-current overhead line by means of a direct-current circuit breaker, each direct-current overhead line is connected to a direct-current side of an onshore converter unit by means of the direct-current circuit breaker, and each direct-current overhead line is connected to more than one onshore converter unit; a direct-current side of each onshore converter unit is configured with a direct-current high-speed parallel switch and, by means of the direct-current high-speed parallel switch, is connected to a direct-current overhead line, and an alternating-current side of each onshore converter unit is connected to one load center; and the offshore converter stations and the onshore converter units all adopt a half-bridge MMC topology. The present application can achieve reliable and low-cost super-large-capacity direct-current delivery.

The invention discloses an anti-radiation low-phase noise voltage-controlled oscillator based on an SOI (Silicon On Insulator) process, relates to the technical field of oscillators, and is used for solving the technical problem that the existing voltage-controlled oscillator based on the SOI process cannot realize low phase noise and high anti-radiation capability at the same time. The anti-radiation low-phase noise voltage-controlled oscillator based on the SOI technology comprises an energy storage unit and a negative transconductance unit. The energy storage unit forms a resonant cavity through an inductor and a capacitor; the negative transconductance unit is connected with the energy storage unit; the negative transconductance unit at least comprises a first cross-coupled pair and a second cross-coupled pair which are formed by a plurality of transistors; the first cross coupling pair is used for generating negative resistance to compensate the loss of the energy storage unit, and the second cross coupling pair serves as a current switching network; the first cross coupling pair and the second cross coupling pair form a negative resistance characteristic, direct-current energy is converted into alternating-current oscillation energy, loss of the resonant cavity is compensated, and a generated oscillation signal is output from the output node.

A controller for a multiphase voltage regulator in a multi-rail power supply system has a dynamic overcurrent unit and a switch control circuit. The dynamic overcurrent unit provides an overcurrent threshold based on a system-input current which indicates a total input current of the multiphase voltage regulator and at least another voltage regulator. The switch control circuit provides a plurality of switch control signals to control a plurality of switching circuits of the multiphase voltage regulator, such that an output voltage of the multiphase voltage regulator is regulated to a predetermined voltage level and an output current of the plurality of switching circuits is controlled based on the overcurrent threshold.

The utility model relates to the technical field of high-voltage cascade energy storage systems, and discloses a valve hall type high-voltage cascade energy storage system based on nested power modules, which comprises three phases of chain type energy storage bridge arms respectively connected with three phase lines of a power grid, and each phase of chain type energy storage bridge arm comprises a plurality of cascaded nested power modules. Each nested power module comprises a plurality of direct-current energy storage units and an H-bridge circuit, the plurality of direct-current energy storage units are connected in parallel and then connected with the direct-current side of the H-bridge circuit, and the alternating-current side of the H-bridge circuit is connected with an alternating-current switch; the DC energy storage unit comprises a battery cluster and a DCDC converter connected with the battery cluster in parallel, the DCDC converter comprises a first capacitor, a second capacitor and a power conversion unit, and the power conversion unit comprises three full-control semiconductor devices and an inductor. According to the utility model, each battery cluster is accurately controlled through the DCDC converter in the embedded power module, so that the reliability of the valve hall type high-voltage cascade energy storage system is improved.

This suppresses power waste caused by discharging residual charge. [Solution] The emitter 10 of the distance measuring device 1 for measuring the distance to an object comprises a transmitting unit that outputs a transmission wave to irradiate the object, a capacitor 120 that is charged by a power supply and supplies current to the transmitting unit, a switching element 150 that controls the current flowing to the transmitting unit, a drive circuit that controls the switching element, and a control unit 180 that, after irradiating with a transmission wave, sends a control signal to the drive circuit to continuously irradiate with a transmission wave of an irradiable distance according to the residual charge of the capacitor 120.

Controller and method for a constant-current switch-mode power converter. For example, a controller for a constant-current switch-mode power converter includes: a constant-current controller configured to receive an input voltage and generate a modulation signal based at least in part on the input voltage; and a driver configured to receive the modulation signal, generate a drive signal based at least in part on the modulation signal, and output the drive signal to a transistor coupled to an inductive coil and a resistor; wherein: the drive signal corresponds to at least one switching cycle; the switching cycle includes an on-time during which the drive signal is at a first logic level and an off-time during which the drive signal is at a second logic level; and the off-time includes a demagnetization period during which the inductive coil undergoes a demagnetization process.

The invention discloses a tripper, a direct-current switch control method of a power converter and an application device of the tripper, and relates to the technical field of power electronics. The release is provided with two execution mechanisms which respectively receive corresponding signals, so that the state of the release is controlled by the two execution mechanisms at the same time; when an application device of the release enters a power-off state from a non-running state, the state of the release is a pull-in state, at the moment, a switch body connected with the release can be freely opened and closed, and tedious operation after a fault is eliminated when an under-voltage release is adopted is avoided; when the application equipment enters the power-off state from the operation state, the state of the release is a release state, and at the moment, the switch body connected with the release is disconnected and cannot be switched on, so that the risk of fault expansion caused by manual switching on when the fault is not eliminated by adopting the shunt release is avoided; and furthermore, targeted tripping actions can be carried out under different power loss conditions, and the requirements under different conditions are considered.

The invention discloses a switching operation command issuing method and system based on networking and a medium, mainly relates to the technical field of switching operation commands, and is used for solving the problems that in the prior art, manual input errors exist, checking and transmission efficiency is low, manual judgment is possibly affected by factors such as emotion and pressure, and decision errors are caused. Comprising the following steps: generating a switching operation command which has reverse symmetry or reversion with a current switching operation command; inputting the switching operation command into a preset operation command checking rule program to obtain a checking result corresponding to the switching operation command; obtaining return information returned by the operation terminal through the to-be-returned interface, and giving an alarm and intercepting issuing operation when the return information does not belong to the same operation unit and station name; determining an issuing mode of a switching operation positive order; obtaining a preset positive order comparison group and a preset pre-order comparison group; and judging whether the preset positive command comparison group is the same as the preset pre-command comparison group or not, generating a comparison result, and issuing the comparison result to a preset operation and maintenance terminal.

The present invention provides a system, a method and a storage medium for synchronously testing silicon carbide devices. The system includes: a selection module, a test switching module, a heating current switching module and a measurement current switching module; the selection module is used to install the device to be tested and obtain a detection signal after the installation is completed; the test switching module receives the detection signal and provides a startup voltage for the device according to the detection signal; the heating current switching module receives the detection signal and controls the corresponding relay to work according to the detection signal so as to enable the heating power supply circuit corresponding to each device to be turned on and supply a heating current to the device; the test switching module also receives a measurement signal and provides a measurement voltage for the device according to the measurement signal; the measurement current switching module receives the measurement signal and controls the corresponding output switch to work according to the measurement signal so as to enable the measurement power supply circuit corresponding to each device to be turned on and supply a measurement current to the device. This application can simultaneously test at least one type of device.

This invention discloses a leakage current detection method for an industrial robot electrical cabinet, including port P1. The leakage current detection method is as follows: Current flows through the PE (protective earth) and through the current transformer L1. When the current I1 flowing through the primary and secondary sides of L1 increases; the principle of the current transformer is: N1 / N2 = I2 / I, resulting in I2 = I1*N1 / N2; therefore, the current I2 flowing through the secondary side of the current transformer L1 also increases; when there is no leakage current in the cabinet, there is no current or the current on the PE is very small, U- < 5V; the voltage at the non-inverting terminal of the comparator is greater than the voltage at the inverting terminal, Vout = H, and the output pin 1 of the LM393D is high, and the LED is constantly lit. Based on the characteristics of the electrical cabinet, this invention eliminates the need for a leakage current switch. By designing a current detection circuit flowing through the PE, it determines whether there is a leakage current in the equipment. Its setup cost is lower than that of installing a leakage current protection device.

The invention relates to the technical field of power control, in particular to a filter and leakage inductance collaborative design method of a single-stage bidirectional high-frequency isolation inverter, which comprises the following steps: acquiring basic design parameters, constructing an inverter modulation model according to a modulation strategy, and solving the model to obtain a modulation signal expression; deriving a zero-current switching current constraint condition and a zero-voltage switching current constraint condition of the switching tube based on a modulation strategy; combining the constraint condition with an inverter modulation model, and solving to obtain a soft switching constraint condition; according to the soft switching constraint condition and the value range of the modulation signal expression, determining a collaborative value range of the filter inverter side inductance and the transformer leakage inductance meeting the soft switching requirement; and selecting design parameters of inverter side inductance and transformer leakage inductance of the filter, and determining other circuit parameters of the filter according to a reactive power demand and a grid-connected harmonic standard. According to the invention, the problems of soft switching failure, loss increase and electromagnetic interference caused by parameter mismatching can be effectively suppressed.

The present invention provides a memory, including: a packaging substrate, connected with a main control module, a flash memory module, a power supply module, a plurality of unconnected pins, and a plurality of solder balls, wherein the unconnected pins are connected to some of the solder balls; a current switching module, electrically connected to the power supply module; at least one semiconductor temperature control module, the semiconductor temperature control module including: a first substrate, located at the periphery of the main control module and the flash memory module; a second substrate, arranged opposite to the first substrate, and connected to the unconnected pins; a semiconductor temperature control array unit, formed between the first substrate and the second substrate; wherein the current switching module is also electrically connected to the semiconductor temperature control array unit, and is used to adjust the flow direction of the current in the semiconductor temperature control array unit according to the control signal of the main control module, so as to control the cooling or heating of the semiconductor temperature control array unit. The memory provided by the present invention can work normally under extreme temperature conditions.

The invention discloses a solid-state power controller resonance mode zero-voltage switching-on method based on variable inductance, belongs to the technical field of power electronic conversion, and aims to solve the problems that when a solid-state power controller is started, the peak stress of a device is large, the heat dissipation requirement is large, and the load adaptability is poor. The circuit comprises a resonant network, a main loop power tube and an auxiliary power tube, wherein the resonant network consists of a variable resonant inductor and a pre-charging capacitor; a variable resonant inductor is used for performing parameter matching on different resistive, inductive and capacitive loads to control a resonant mode to be in a critical damping state, so that a pre-charging capacitor discharges in a fastest non-oscillation manner to realize zero-voltage switching on of a main power tube and zero-current switching on and off of an auxiliary power tube; a resonant cavity energy recovery device is arranged to transmit resonant energy to a load. The circuit significantly reduces peak stress when a main loop device is started, reduces switching loss of an auxiliary loop device, recovers resonance energy to a load end, reduces heat dissipation requirements, adapts to load scenes with different properties, and is suitable for the field of high power and high reliability.

The invention provides an inverter, an inverter alternating current switching-on method, a controller and a power conversion system, and relates to the technical field of power electronics. According to the inverter, by means of alternating-current PID protection equipment connected inside or outside the grid side of the inverter, under the condition that the common-mode voltage difference between the two sides of an alternating-current switch is larger than or equal to a threshold value, a control module controls the alternating-current PID protection equipment to output voltage so as to reduce the common-mode voltage difference to be smaller than the threshold value, and then the alternating-current switch is controlled to be switched on; namely, the common-mode voltage difference is reduced by means of the alternating current PID protection device, so that the surge current during alternating current switching-on is reduced, the risk of ablation of a contact of an alternating current switch is reduced, and the influence on the service life of the inverter is further reduced.

The utility model relates to the technical field of large-current switch mounting bases, in particular to a large-current switch mounting base which comprises a bottom plate, the lower end of the bottom plate is connected with two groups of supporting plates I and two groups of supporting plates II in a clamping mode, and the upper ends of the supporting plates I and the supporting plates II are attached to the lower end of the bottom plate. The second supporting plate is located between the two first supporting plates, a plurality of fixing holes used for switch installation are formed in the bottom plate in a penetrating mode and penetrate through the first supporting plates and the second supporting plate, and the two sides of the bottom plate are fixedly connected with side edges used for base installation. The base frame is composed of the base plate, the first supporting plates and the second supporting plates, supports are installed at the bottom of the switch, the base plate is supported by the first supporting plates and the second supporting plates, the switch base and the base plate are installed through the fixing holes, the organization structure of the base is optimized, the production process of the base is simplified, the types of assembly parts are reduced, and the production efficiency is improved.