134 results about "Thyristor drive" patented technology

The invention relates to a submodule circuit board for a dynamic analog test for simulating a high-capacity modularized multi-level modular converte. A plurality of independent MMC (Multi-level Modular Converte) submodules reducing parameters according to an equitime constant method with a voltage level less than 50V are arranged on the circuit board; the plurality of submodules are completely independent and are of a series relationship; and the submodule comprises chips for controlling, coding and decoding, an optical fiber channel, a main circuit (provided with a capacitor and two IGBTs (insulated gate bipolar transistor) of an upper-lower series structure connected with the capacitor in parallel, a bypass switch connected with the lower IGBT in parallel, and a thyristor used for protecting the IGBTs and the capacitor and connected with the lower IGBT in parallel), an IGBT and thyristor drive circuit, a capacitance voltage sampling circuit, and a circuit board isolating power source which are respectively independent.

The invention discloses a two-phase STATCOM (Static Synchronous Compensator) management device on a traction side of an electrified railway, and a control method of the device. The device is connected with a two-phase power supply arms on a secondary side of a traction transformer in parallel, and comprises converter equipment and a control system. The converter equipment comprises two single-phase full-bridge inverters with a back-to-back structure form, and two groups of passive filters, wherein the transfer of active power between the two power supply arms can be realized through the control on capacitor voltage on a shared direct current side, and thus the load of two phases can be balanced; the two groups of passive filters are used for compensating harmonic wave and reactive power. The control system comprises a data acquisition system, a master control system, a PWM (Pulse-Width Modulation) signal generation system and a thyristor driving system. The device is arranged on a low-voltage side, so that the capacity demand of the device is reduced, the cost of the device is lowered, and the reliability of the device is improved.

The invention provides a combined type arc-free alternating-current (AC) contactor with the function of thyristor fault diagnosis. The combined type arc-free AC contactor comprises an AC contactor body, parallel shunt branch circuits and a detection control device, wherein the parallel shunt branch circuits are respectively connected to the two ends of each three-phase main contact of the AC contactor body in parallel; the parallel shunt branch circuit of each phase comprises a current detection unit, a bidirectional thyristor, a thyristor self-check relay, a thyristor self-check resistor and an electromagnetic relay; the detection control device comprises a three-phase voltage detection unit, an A-phase voltage zero-crossing detection unit, a three-phase current detection unit, an A-phase current zero-crossing detection unit, a solenoid excitation unit, a thyristor drive unit, an electromagnetic relay drive unit, a current detection unit, a resistance-capacitance buck power supply and a microcontroller. The combined type arc-free AC contactor is used for frequently connecting or disconnecting an AC main circuit, and the generation of electric arcs during each action of the contactor is inhibited through the instant current shunting of power electronic devices, so that the erosion to the main contacts of the contactor caused by the electric arcs is reduced greatly.

The present invention relates to a power network voltage drifting-down generator, comprising a thyristor control circuit(1), an isolating transformer(5), a step-down transformer(3), a bypassing thyristor(2), a starting thyristor(4) and a thyristor drive circuit. The thyristor control circuit(1) is used for detecting the input voltage signal, deciding the continuity signals of the reverse parallel connection thyristor. The bypassing thyristor(2) and the starting thyristor(4), sending the actuating signal of the reverse parallel connection thyristor at the zero crossing point of the input signal, the running state of the step-down transformer(3) is controlled through the bypassing thyristor(2) and the starting thyristor(4), changing the value of the input voltage. The present invention is capable of realizing the instant change to the input voltage.

The invention provides a digital variable frequency defibrillator which comprises a digital controller and a pulse output circuit, wherein the pulse output circuit comprises a power supply, a half-bridge inverter circuit, a pre-transformer, a full-bridge rectifier circuit, a soft switching circuit, a voltage division circuit, an LC (inductance-capacitance) resonance circuit, a post transformer and a discharge electrode which are sequentially connected; the power supply, the half-bridge inverter circuit, the full-bridge rectifier circuit, the soft switching circuit, the voltage division circuit and the LC resonance circuit are respectively connected with the digital controller by a power supply voltage detection circuit, a half-bridge inverter MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving circuit, a soft switching MOSFET driving circuit, an after-rectifying voltage monitoring circuit and an LC resonance thyristor driving circuit. The invention also discloses a variable frequency pulse control method, solves the problems of uncontrollability of pulse frequency and low utilization rate of energy in the prior art and improves working efficiency, reliability and service life of a system.

A drive system for an electric motor includes a connection for a battery, and an inverter having an input side connected to an intermediate circuit and an output side having a connection for an electric motor. The intermediate circuit includes a first thyristor connected in parallel with an intermediate circuit capacitance. The drive system may also include a rectifier having an input side connected at the output side of the inverter in parallel with the electric motor, and a second thyristor connected an output side of the rectifier. The first / second thyristor are configured to be activated by a monitor incorporated in or assigned to the drive system. In the event of a malfunction, the input and / or output side of the inverter can be electrically isolated to allow a multiply redundant armature short circuit.

In a cycloconverter generator, there are provided, q number of power circuits that supply rectified DC power of a DC power supply unit as operating power to the p (p>q) number of thyristors, and r (p>r) number of thyristor drive circuits that are connected to the q number of the power circuits and drive the p number of the thyristors, wherein the r number of the thyristors drive circuits are individually used to drive in common ones among the p number of the thyristors whose operation is unaffected even if driven at the same timing such that the number r of the drive circuits is made smaller than the number p of the thyristors, thereby enabling to simplify circuit configuration.

The invention discloses a soft starter for an LS-PMSM. The soft starter is characterized in that the output end of a starting and halting control circuit and the input end of a thyristor drive circuit are respectively connected with the I / O port of a microprocessor circuit; the output end of the thyristor drive circuit is connected with the drive input end of a thyristor module; the output end of a three-phase power supply circuit is connected with the power supply end of the microprocessor circuit through a power-switching circuit; the output end of a soft starting and direct starting control circuit is connected with the control input end of a switching circuit; the output end of the switching circuit is connected with the drive input end of a thyristor module; and the output end of the three-phase power supply circuit is connected with a power supply system of a grid. According to the soft starter for the LS-PMSM, the problem of great impact on the grid and mechanical equipment caused by large starting current during a direct starting of the LS-PMSM is solved, the starting current is reduced, and applied range of PMSM is increased.

The invention belongs to the field of electrical technology and discloses a phase sequence self-adaption trigger circuit of a three-phase fully-controlled rectifier induction heating power supply. The phase sequence self-adaption trigger circuit is connected in series between a three-phase alternate current and a three-phase full-bridge thyristor drive axle and mainly comprises a phase sequence judging circuit, a three-phase synchronous signal additional phase shifting and phase sequence gating circuit, a thyristor three-phase trigger pulse phase shifting circuit and a three-phase trigger phase gating and output circuit. After a three-phase switching-in phase sequence of the induction heating power supply is judged by the phase sequence judging circuit, a suitable three-phase rectifier trigger pulse is generated by the three-phase synchronous signal additional phase shifting and phase sequence gating circuit and is sent into the thyristor three-phase trigger pulse phase shifting circuit to generate phase shifting; and the three-phase rectifier trigger pulse which is subjected to phase shifting is sent to the three-phase trigger phase gating and output circuit to drive a thyristor of the three-phase full-bridge thyristor drive axle. According to the invention, the random switching-in of a line sequence of three phases of the induction heating power supply is implemented and the phase sequence self-adaption trigger circuit has the characteristics of simple structure and low cost.

A generation method of the driving waveform of a thyristor rectifier comprises the following steps that power grid voltage signals are collected, and a phase-locked loop follows power grid voltage and outputs a sinusoidal signal the same with the power grid voltage in direction; a reference waveform corresponding to a thyristor drive bridge arm is obtained by calculation according to the sinusoidal signal; the difference between the actual zero time of the reference waveform and the corresponding PWM break time is calculated; according to the time difference, the PWM break time is adjusted, so that a PWM control wave and the reference waveform are synchronous; according to the PWM control wave, a double-narrow pulse drive wave is output to control upper and lower thyristors on the corresponding thyristor drive bridge arm to work. According to the scheme, high-precision PWM control wave emission is achieved, breakover time control on the thyristors is more accurate, and working precision and stability of the thyristor rectifier are improved effectively.

The performance of a generator is improved in a higher range of the output by correcting a decrease in the average direct current voltage supplied to an inverter. An average calculator 95 calculates an average of direct current voltage inputs to the inverter 4 for comparing with a target voltage (level) VDC. When it is judged by an average voltage deviation detector 96 that the average is smaller by a specific amount than the target voltage level, the target voltage level is increased by an adjusting unit 98. A conductor angle setting unit 93 determines the conduction angle of thyristors to change the voltage input of the inverter (4) to an adjusted target voltage level VDCm. A thyristor drive circuit 94 controls the conduction of the thyristors in the converter 3 according to the conduction angle.

The invention discloses an intelligent control device based on Lonworks electric power carrier communication, which comprises an electric power carrier communication substrate and a power electronic device monitoring controlling application plate. The electric power carrier communication substrate is in communication with a monitoring host through a Lonworks network. The electric power carrier communication substrate comprises a power supply module, a PL3120 communication control module and a coupling circuit. The power electronic device monitoring controlling application plate is in communication with the electric power carrier communication substrate through an input / output (IO) pin. The power electronic device monitoring controlling application plate comprises an over-current detection module and a thyristor drive output module which is directly connected with a controlled device. The intelligent control device based on Lonworks electric power carrier communication is capable of lowering construction cost of a monitoring system and reducing occupied space and difficulty in maintenance at a later stage, and is especially suitable for places where line laying-out cannot continue in civil air-defense construction or occasions when wall chiseling and pipe penetrating absolutely cannot occur after a structure is finished in civil air-defense construction.

The microcomputer controlled phase shift triggered voltage stabilizer for permanent magnet generator includes circuit of operational power supply, circuit for collecting three-phase voltage and frequency of motor, setting circuit for voltage regulation and feedback, circuit of single chip, and thyristor drive circuit etc. Using calculation function of single chip implements closed loop control of software, and turns on three-phase shift triggering pulse to trigger thyristor. Built in or configured in permanent magnet generator, voltage stabilizer outputs stable DC voltage. Self-starting mode is adopted in the invention. Thus, generator can output stable voltage without need of external voltage so as to prevent phenomena of no outputted voltage if no external DC voltage (for ex. in excitation type motor) from occurring. Advantages are: raised reliability, reduced maintenance work, good load characteristic, quick adjustment and high precision of output voltage.

The invention discloses a dynamic switching control device for an uninterruptible power supply system to add an impulsive load suddenly, which comprises a main circuit and a control circuit. The control circuit comprises a Hall current sensor, a current filter, a current sampling circuit, a contact detection unit, a contractor coil drive unit, a subtractor, a comparer, a switching order controller, a PWM drive circuit and a by-pass thyristor drive circuit. When current acquisition values are continuously larger than a given reference value for three times within three on-off cycles, the switching order controller sends out a signal to switch on a by-pass thyristor and sends out another signal to switch off a contactor coil at the same time, thereby realizing the simultaneous power supply of a bypass and an inverter circuit of the main circuit. When the contact detection unit detects that a contact of the contactor is switched off, the switching order controller sends out a signal to block a PWM pulse, thereby realizing the independent power supply of the bypass of the main circuit. The invention can realize instant and quick switching when the uninterruptible power supply system adds the impulsive load suddenly without increasing the equipment cost, and can effectively solve the voltage sag and interruption of output voltages.

The invention provides a passive filtering device and method with a fault arc detection function. The device comprises a voltage sensor, a current sensor, a sampling circuit, a signal processing circuit, a master control MCU, an arc fault alarm circuit, a switch quantity isolation and output circuit, a thyristor driving circuit, a thyristor switch, a capacitor and an inductor. The current detecting part of a failed arc and a current detection part of a passive filtering are shared, a same detection signal is used, a common master control unit is used to carry out fault arc analysis and harmonic content calculation, thus the device can be sampled before of the filtering of the failed arc characteristic current, and the accurate detection of a failed arc is ensured. According to the fault arc detection method, the judgment result of a current difference parameter is used as a premise, a harmonic ratio and change rate are used to judge the failed arc, the interference of a nonlinear load can be effectively eliminated, four judgment means are used to carry out judgment at the same time, and the failed arc is accurately detected.

Charging time of a capacitor is shortened while avoiding erroneous firing due to distortion of a power supply voltage and sustaining an inrush current at a constant level. In the charge control method of a capacitor in a thyristor converter comprising a thyristor for rectifying an AC voltage, a CPU delivering an on / off control signal to a thyristor driver for driving the thyristor, a voltage detection sensor for measuring the AC voltage and the capacitor charging voltage, and the capacitor connected with a DC circuit, the AC voltage and the capacitor charging voltage are measured by means of the voltage detection sensor, differential voltage between the firing phase voltage of the thyristor and the capacitor charging voltage is determined, and the thyristor is fired only when the firing phase voltage of the thyristor becomes lower than a specified voltage determined from the differential voltage.

The invention discloses a distributed generation reactive compensation device, relating to a grid compensation device and providing a distributed generation reactive compensation device which can operate stably and cannot generate resonance. The distributed generation reactive compensation device is provided with a thyristor controlled reactor, a fixed capacitor group, an active power filter and a control circuit, wherein the thyristor controlled reactor is directly connected with a power grid in parallel; the fixed capacitor group is connected with the active power filter in series and is then connected to the power gird; a driving pulse signal end of the control circuit is respectively connected with the thyristor controlled reactor and the active power filter. The control circuit can be provided with a grid voltage and current sampling circuit, a digital signal processing (DSP) controller, an IPM (Intelligent Power Module) driving circuit, a thyristor driving circuit, a liquid crystal display and a protection circuit.

The invention discloses a phase-controlled type AC-AC (alternating current) frequency converter real-time trigger pulse generation system and method thereof. The system comprises a voltage and current measurement unit, a signal conditioning unit, a pulse real-time generation and coding unit, a serial port communication unit, an interrupt signal source, a frequency converter logical judgment unit,a synchronous parallel unit, a pulse decoding unit and a thyristor driving unit which are all interconnected, wherein a system power supply unit is connected with the signal conditioning unit, the series port communication unit, the pulse real-time generation and coding unit, the frequency converter logical judgment unit, the synchronous parallel unit and the pulse decoding unit through power lines. The method comprises: the phase-controlled type AC-AC (alternating current) frequency converter real-time trigger pulse generation system adopts a multi-pointer method to realize the real-time generation of pulse, and also can reduce the direct current component and subharmonic component of the output voltage. Therefore, the system can be applied to all kinds of high-power AC transmission systems including frequency dividing wind power generation systems.

The invention relates to a resistance welding constant-current control device. The device is characterized in that a sensor is arranged on a welding electrode and is connected with a welding current synchronous circuit; a pedal switch and an electromagnetic valve are separately connected with an optoelectronic isolating circuit; and the welding current synchronous circuit, a net voltage synchronous circuit, a tablet computer, a silicon controlled thyristor drive circuit and the optoelectronic isolating circuit are separately connected with a SCM control unit circuit. The current value collected by the device at a wielding point is calculated by a SCM to compare the actual current value with the defined value, the silicon controlled thyristor control angle of the next welding cycle can be adjusted according to the current power factor, and the constant current electrical resistance welding value can be obtained. The obtained good control effects are as follows: when the net voltage changes between 340V to 420V, the fluctuation of the constant-current control accuracy is less than + / -1%; and the stability and reliability of the long-term operation of the device are high.

Disclosed is a thyristor contactor current detection device, which comprises a display panel and a mainboard connected with each other, wherein the mainboard is provided with a microprocessor; the microprocessor is connected with modules including a thyristor driving circuit, a thyristor status detection circuit, a current detection circuit, a power supply circuit, a fan driving circuit, a starting control signal detection circuit, a silicon controlled rectifier status indicating lamp, a temperature detection circuit, an overtemperature fault indicating lamp, a starting DO output and a fault DO output; the current detection circuit is connected with a current detection device for detecting a current of a rotor coil; the thyristor driving circuit and the thyristor status detection circuit are connected with a thyristor module for controlling the switching on and off of the rotor coil; the current detection device comprises an outer shell which is internally provided with a hollow coil wound on an insulating support; and the coil is used for being threaded by a conductor, and the coil comprises a connector which is used for being connected with a circuit board for outputting an induced voltage.

The invention discloses a fuzzy control strategy-based asynchronous motor soft starter. The soft starter comprises a central processing unit (CPU), a three-phase power supply, a power supply module, a keyboard module and a display module, wherein the three-phase power supply is connected with the CPU through a current detection module and an analog / digital (A / D) conversion module. The soft starter is characterized by also comprising a joint test action group (JTAG) simulation debugging module, a thyristor conduction angle measuring circuit and a thyristor driving voltage regulating circuit connected with the CPU, wherein the thyristor driving voltage regulating circuit is connected with a motor. The fuzzy control strategy-based asynchronous motor soft starter can simultaneously provide two start modes for a user to select, and in the two start modes, the thyristor trigger angle is calculated by adopting a fuzzy control table. Compared with the traditional thyristor soft starter, the fuzzy control strategy-based asynchronous motor soft starter has the advantages of strong interference resistance, high control speed, high robustness, strong adaptability and the like.

The present invention discloses a thyristor fault detection system and method. The system comprises: a thyristor drive control signal output module configured to output drive signals to a thyristor after control signals are received; a thyristor drive signal sampling module configured to collect the drive signals; a thyristor output voltage sampling module configured to collect a first output voltage of the thyristor when there are the drive signals and collect a second output voltage when there is no a thyristor; and a processing module configured to output the control signals and determine the state of the thyristor according to determination of whether there are the drive signals or not and determination of whether there is the first output voltage and / or the second output voltage. Thethyristor fault detection system and method can accurately and effectively detect whether the thyristor has faults or not to facilitate later maintenance of the thyristor and a device where the thyristor is located so as to improve the safety of the thyristor and the device where the thyristor is located.

Disclosed is a converter controlled generator. The generator converts a direct current outputted from a converter constituted of semiconductor rectifying elements for rectifying an output of a magnet generator into an AC. The conduction of thyristors is determined by a thyristor drive unit to control the voltage output of the converter to a target voltage level. The target voltage level is set to a positive value corresponding to the speed of the generator. The target voltage level is lowered when the generator is operated at a lower speed range and elevated when at a higher speed range. Accordingly, the output of the magnetic generator is increased substantially in proportion to the speed.

The invention discloses a power supply control device for a polycrystalline silicon reduction furnace, which comprises a voltage current module, a temperature sensing module, a digital filtering module, a phase tracking module, an input and output module, a control module, a light triggering module, a field bus module, a thyristor driving module and an HMI (Human Machine Interface) module. The voltage current module changes high voltages and large currents on silicon rods into analog signals of less than 5V; the temperature sensing module changes temperatures of the silicon rods of the original furnace into analog signals of less than 5V; high-frequency interference signals are filtered from the analog signals by the digital filtering module and the sampling is carried out to generate digital signals which can be identified by a computer; the control module implements a control strategy according to the digital signals; the control on the currents of the silicon rods and the conversion of a connection method are implemented by the light triggering module or the input and output module; and the thyristor driving module can directly drive a high voltage primary part and is isolated by optical fibers and a lowe voltage part. The invention solves the unbalance problem of a parallel loop of the power supply control device for the reduction furnace.

The invention relates to an efficient coupling energy taking based high-voltage TSC driving device, belongs to the technical field of high-voltage TSC driving, and aims to solve problems such as poor isolation intensity and poor anti-interference ability of a high-voltage TSC driving device at present. The efficient coupling energy taking based high-voltage TSC driving device comprises a signal conditioning module, a control module, an optical fiber transmission module, a DC power supply circuit, a coupling energy taking circuit and a TSC driving circuit, and is characterized in that three-phase voltage and three-phase current at a load side of a power distribution network are inputted into the signal conditioning module, voltage and current signals outputted by the signal conditioning module are transmitted to the control module, switching signals outputted by the control module are transmitted to each thyristor driving board of the TSC driving circuit through an output end of the optical fiber transmission module; high-frequency output of the DC power supply circuit is transmitted to the coupling energy taking circuit, and the coupling energy taking circuit provides a working power supply for each thyristor driving board of the TSC driving circuit; and the thyristor driving boards output driving signals to gate poles of thyristors according to zero-cross detection signals and the switching signals of the corresponding thyristors. The efficient coupling energy taking based high-voltage TSC driving device is used for driving high-voltage thyristors.

The invention discloses a two-circuit power supply high-voltage frequency converter unit bypass device based on a thyristor. The two-circuit power supply high-voltage frequency converter unit bypass device comprises a two-circuit power supply AC (Alternating Current) / DC (Direct Current) power supply, a thyristor driving plate, a thyristor and an anti-parallel diode rectifier bridge of the thyristor, wherein the two-circuit power supply AC / DC power supply supplies power to the thyristor driving plate; the thyristor driving plate communicates with a unit control plate through a fiber; the thyristor driving plate is connected with the thyristor to control the thyristor to be switched on and off; and the thyristor provided with the diode rectifier bridge is connected to the output end of the high-voltage frequency converter unit in parallel. When devices including an IGBT (Insulated Gate Bipolar Translator), a rectifier module and the like in a power unit fail, a function that the power unit and other power units are removed is realized. The two-circuit power supply high-voltage frequency converter unit bypass device adopts a two-circuit power supply way, and is provided with a thyristor adsorption circuit to effectively adsorb a voltage spike generated when the thyristor acts, and therefore, the reliability of a power unit bypass system is greatly improved.

The invention relates to the technical field of the protection of a storage battery, and discloses an overtemperature warning device for the storage battery and an overtemperature warning method for the storage battery. The warning device comprises a temperature detecting and controlling circuit, an executing mechanism and an acousto-optic warning circuit, wherein the temperature detecting and controlling circuit is formed by the means that a temperature detecting circuit is connected with a temperature controlling circuit, and the temperature controlling circuit is connected with the executing mechanism and the acousto-optic warning circuit. The overtemperature warning method comprises the following steps of: magnifying an electric signal of an electric contact temperature gauge Q by a transistor V1 when the temperature of the storage battery is increased or exceeds a set temperature value 40 DEG C, triggering a thyristor VT, driving a relay K to work, and triggering the acousto-optic warning circuit and the executing mechanism to work. The invention can overcome the faults that the inner part of the storage battery is heated, a clapboard is damaged, and an inner circuit board falls off since the charging time is overlong; and the accident potential can be eliminated in a budding status, the safe and reliable running of a direct-current source of a power system transformer substation can be guaranteed, and the device and method provided by the invention have the characteristics of being wide in applicable scope, simple in circuit, economical and applicable.

The invention discloses a quick arc extinguishing system and method for a single-phase ground fault of a low-current ground system. The quick arc extinguishing system comprises a ground line selection device, an inverse parallel thyristor group and a thyristor driving device. The ground line selection device adopts bus three-phase voltage and zero-sequence voltage, judges whether a ground fault exists according to the zero-sequence voltage and judges the ground phase according to the voltage drop phase in the three-phase voltage after single-phase grounding happens, and then the thyristor group driving device triggers the inverse parallel thyristor group to be turned on, the fault phase is directly grounded, and the voltage between the fault phase and the ground is pulled down, so that the accidents of arcing over voltage, cable burnout, personal casualty and the like in the continuous operation process after grounding are prevented.

The invention provides a thyristor detecting method for a semiconductor motor dicing resistance controller. A main board is arranged; and a display board is arranged on the main board. A microprocessor and an acceleration controller are arranged at the main board; the microprocessor is connected with a power source and commercial power is provided for the microprocessor through the power source; and a fan driving circuit is connected to the microprocessor and the microprocessor is connected with and controls a fan through the fan driving circuit. A startup control signal detecting module is arranged at the microprocessor; the microprocessor is connected to the acceleration controller through a thyristor driving circuit; the acceleration controller is connected to the microprocessor througha thyristor state detecting module; and the acceleration controller is connected to the microprocessor through a voltage detecting circuit. According to the invention, a forward control input signaland a reverse control input signal are inputted simultaneously without conduction, so that simultaneous conduction is avoided and thus a sending short-circuit risk is prevented. Moreover, the accelerated contactor control is realized and the quality of an internal silicon controlled rectifier is measured additionally.

The invention discloses a lossless thyristor driving circuit, and relates to the technical field of thyristor driving circuits. The lossless thyristor driving circuit comprises a thyristor Qa, a resistor R2, a rectifying diode D1, triodes Q1-Q3, diodes D2-D4, a resistor R1, resistors R3-R4, a capacitor C1 and a transformer T, wherein lossless driving is completely realized on the primary side of the transformer in the driving circuit. Compared with a lossy driving circuit (Fig. 2), the driving circuit is additionally provided with a VCC2 power supply of which the value is lower than that of VCC1. The VCC1 is used for providing peak driving current for the thyristor, and the VCC2 is used for providing platform driving current for the thyristor. The VCC2 can be obtained by using the VCC1 and a simple switch step-down chip. Through the driving circuit, the driving circuit loss, the demand of power supply power, the driving cost and the temperature of the driving circuit are lowered effectively, the area of a thyristor driving plate is reduced, and the reliability of the driving circuit is improved.