Contactor control method for energy storage

Abstract

The invention relates to the field of contactor control, in particular to a contactor control method for energy storage. The voltage of the control coil is controlled in the iron core closing process based on the PWM Drive so as to suppress closing collision; in the holding process, the current of the coil is kept and controlled by half voltage to realize energy-saving control; the two ends of the opening process coil are connected in parallel with a diode and a resistor to suppress the transient turn-off voltage peak of the coil; meanwhile, overvoltage protection is achieved; according to the invention, based on a PWM Drive drive signal of a high-speed controller and a Boost circuit, intelligent adjustment of the PWM duty ratio of closing and holding in the closing process and the holding process is realized, so that voltages at two ends of an electromagnetic coil are adjusted to realize the effects of suppressing closing collision in the closing process and optimal energy conservation in the holding process, and meanwhile, falling and electromagnetic interference on an energy storage control power supply are suppressed.

Description

Technical Field

[0001] The invention relates to the field of contactor control, and in particular to a contactor control method for energy storage. Background Art

[0002] In recent years, electrochemical energy storage has developed rapidly. As one of the key electrical components of energy storage systems, AC / DC contactors have attracted extensive attention in research related to contactors. Energy storage contactors use the "rated voltage" of the contactor coil during the closing process. In addition to mechanical wear, the closing collision and closing moment will also produce harsh closing noise, affecting the working state of the controller ADC sampling; in addition, it is easy to cause violent contact bounce, resulting in "arcing" of the contacts, causing electrical erosion of the contacts, seriously affecting the service life of the contactor. Closing collision loss and contact bounce loss are mainly caused by violent closing collision. At the same time, the "rated voltage" is much greater than the required holding voltage, which causes energy waste. During the contactor shutdown process, a voltage spike much greater than the power supply voltage will appear in the electromagnetic mechanism when the inductive load is powered off, threatening the circuit safety.

[0003] In general, there are several problems with current energy storage contactors: 1. The energy storage contactor uses the "rated voltage" of the contactor coil during the closing process, and the dynamic and static iron cores collide violently. During the closing process, the control voltage of the contactor coil lacks reasonable and effective control, which can easily cause the dynamic and static iron cores to collide violently, causing strong suction noise at the moment of closing, and causing wear of the main contacts, accelerating contact erosion and damage, and also causing problems such as voltage drop of the energy storage auxiliary power supply and ADC sampling interference, increasing the failure rate of the energy storage system; 2. The energy storage contactor consumes a lot of power and has a high temperature rise during the holding process. The actual contactor's holding state only requires a small electromagnetic suction force to maintain. If energy-saving operation is not considered in the drive control, a large amount of power will be wasted, and the contactor will have a high temperature rise in the energy storage system; 3. The voltage spike at the moment of the energy storage contactor being turned off is too high. The too-fast opening of the contactor electromagnetic mechanism at the moment of turning off will generate a voltage spike several times higher than the power supply voltage, causing electromagnetic radiation interference, which can easily threaten the contactor drive circuit, ADC sampling and system control power supply voltage impact.

[0004] The current contactors for energy storage have problems such as pull-in noise, contact damage, control voltage source drop, ADC sampling interference; high energy consumption and temperature rise during the holding process; contactor shutdown voltage spikes, ADC sampling interference and electromagnetic radiation. These problems increase the failure rate of the energy storage system. Summary of the invention

[0005] In order to solve the problems of the prior art, the present invention provides a contactor control method for energy storage.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A method for controlling a contactor for energy storage comprises the following steps: S1: Multiple power supplies are input to the flyback power supply, the flyback power supply supplies power to the chip through the power supply circuit, and the flyback power supply supplies power to the contactor drive circuit through the rectifier filter circuit 3; S2: The energy storage contactor control includes two control signal circuits, PWM_Drive and RELAY_Control_DO. When the two signals are satisfied at the same time, the contactor is closed. The energy storage contactor control circuit mainly includes PWM drive circuit, Boost circuit, Boost feedback circuit and control action output circuit. The drive PWM signal is generated by the control chip. The Boost circuit controls the closing process voltage and holding voltage of the energy storage contactor. The rated closing voltage of the contactor is DC24V. S3: At time T0, the contactor is in the open state; at time T1, the contactor receives the closing signal, and the control chip loads the EPwm1Regs.CMPA register data according to the duty cycle to generate an increasing PWM_Drive to drive the Boost circuit to boost the voltage. At the same time, RELAY_Control_DO=1 outputs a high level. The control circuit adds the Boost voltage to both ends of the energy storage contactor coil. As the voltage increases, the current increases, and the magnetic field attraction increases, pulling the moving iron core to accelerate the closing; at time T2, when the contactor is about to close, the PWM_Drive drive changes from increasing to rapidly decreasing to reduce the speed of the moving iron core; at time T3, the contactor is closed and is in the holding process. PWM_Drive drives EPwm1Regs.CMPA=0 to close, and the energy storage contactor is held with a low voltage DC12V. At time T4, the contactor receives the opening command, and the control chip controls RELAY_Control_DO=0 to output a low level, and the energy storage contactor begins to shut down; at time T5, the energy storage contactor completes the opening.

[0007] The energy storage contactor control method relates to an energy storage contactor control system, which is characterized by comprising: a flyback power supply, which supplies power to the chip through a power supply circuit, the flyback power supply is connected to the coil drive circuit through a rectifier filter circuit, the chip controls the output of the coil drive circuit through a PWM pulse signal, and the chip acts on the contactor through the output control; The PWM pulse signal acts on the Boost circuit through the PWM drive circuit; The PWM driving circuit includes a resistor R4, one end of which is respectively connected to one end of a capacitor C3 and one end of a voltage-stabilizing diode D1, the other end of the voltage-stabilizing diode D1 is connected to one end of a resistor R5, and the other end of the voltage-stabilizing diode D1 is connected to a cathode of a diode D2, the other end of the voltage-stabilizing diode D1 is also connected to an overvoltage protection circuit, the anode of the diode D2 is grounded, the other end of the resistor R5 is respectively connected to one end of a push-pull circuit and one end of a resistor R6; the other end of the capacitor C3 is grounded, and the other end of the resistor R6 is grounded.

[0008] The push-pull circuit includes an NPN transistor Q3 and a PNP transistor Q4, the emitter of the NPN transistor Q3 is connected to the emitter of the PNP transistor Q4, resistors R5 and R6 are connected to the bases of the NPN transistor Q3 and the PNP transistor Q4, the collector of the NPN transistor Q3 is connected to a 12V power supply, the collector of the PNP transistor Q4 is grounded, and the emitter of the PNP transistor Q4 is connected to the Boost circuit via a resistor R9.

[0009] The chip is a controller chip, and the controller chip is TMS320F28335+ EPM570F256C5N.

[0010] An overvoltage protection circuit is provided between the PWM drive circuit and the Boost circuit. The overvoltage protection circuit includes a resistor R1. The other end of the resistor R1 is connected to one end of the resistor R2. The other end of the resistor R2 is grounded. The resistance values ​​of the resistors R1 and R2 are equal. The other end of the resistor R1 and one end of the resistor R2 are connected to the emitter of the PNP transistor Q1. The base of the PNP transistor Q1 is connected to a 12V power supply. The collector of the PNP transistor Q1 is connected to one end of the resistor R3. At the same time, the collector of the PNP transistor Q1 is connected to the base of the NPN transistor Q2. The other end of the resistor R3 is connected to the emitter of the NPN transistor Q2. The emitter of the NPN transistor Q2 is grounded. The collector of the NPN transistor Q2 is connected to the anode end of the voltage-stabilizing diode D1.

[0011] The Boost circuit includes a 12V power input terminal, which is connected in series with an inductor L through a fuse R7, and the inductor L is connected to a rectifier diode D3. An NMOS tube Q5 is connected between the inductor L and the rectifier diode D3, and a gate of the NMOS tube Q5 is connected to a resistor R9, and the gate of the NMOS tube Q5 is connected to a PWM drive circuit through the resistor R9. The source of the NMOS tube Q5 is grounded, and the gate of the NMOS tube Q5 is connected to one end of a resistor R8, and the other end of the resistor R8 is grounded; the cathode of the rectifier diode D3 is connected to a 24V power output terminal.

[0012] In the Boost circuit, electrolytic capacitors E1, E2, E3 and E5 are connected in parallel between the ground wire and the power line. The above electrolytic capacitors play a filtering role. At the same time, resistor R10, non-polar capacitor C2 and non-polar capacitor C4 are also connected in parallel between the ground wire and the power line. R10 is a dummy load to prevent the no-load voltage from floating high; the 24V power supply output end is connected to one end of resistor R11, and the other end of R11 is connected to the contactor coil. The contactor coil and R11 are connected in parallel with a spike absorption circuit. The spike absorption circuit includes a diode D6 and a resistor R12. The anode of the diode D16 is connected to the contactor coil, the cathode of the diode D6 is connected to one end of the resistor R12, and the other end of R12 is connected to one end of R11.

[0013] The contactor coil of the contactor 5 is connected to the control circuit, which includes a voltage stabilizing diode D4, an anode of the voltage stabilizing diode D4 is connected to one end of R13, and the other end of R13 is connected to the base of the NPN transistor Q6. R13 is a driving resistor that drives the NPN transistor Q6; one side of the voltage stabilizing diode D4 is connected to one end of the capacitor C4, and the other end of C4 is grounded. The other end of R13 is connected to one end of a diode D5 and one end of a resistor R14, and the other ends of the diode D5 and the resistor R14 are grounded. The collector of the NPN transistor Q6 is connected to one end of the contactor coil, and the collector of the NPN transistor Q6 is connected to one end of the non-polar capacitor C5, the emitter of the NPN transistor Q6 is grounded, and the non-polar capacitor C5 is connected to the emitter of the NPN transistor Q6.

[0014] Compared with the prior art, the beneficial effects of the invention are: based on the PWM_Drive drive signal of the high-speed controller and the Boost boost circuit, the present invention realizes intelligent adjustment of the closing and holding PWM duty cycle during the closing process and the holding process, so as to adjust the voltage across the electromagnetic coil to suppress the closing collision during the closing process, achieve the optimal energy-saving effect during the holding process, and at the same time suppress the power supply drop and electromagnetic interference to the energy storage control.

[0015] The present invention can be extended to other application scenarios, such as charging control field, photovoltaic control field and other application scenarios, providing a new solution for intelligent, efficient operation and maintenance, and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0017] Figure 1 It is a hardware block diagram of the present invention.

[0018] Figure 2 The control principle of the present invention Figure 1 .

[0019] Figure 3 The control principle of the present invention Figure 2 .

[0020] Figure 4 It is the contactor control strategy diagram of the present invention.

[0021] Figure 5 It is the contactor control flow chart of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below by examples, which are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0023] A method for controlling a contactor for energy storage comprises the following steps: S1: Multiple power supplies are input to the flyback power supply 1, which supplies power to the chip 2 through the power supply circuit. The flyback power supply 1 supplies power to the contactor drive circuit (24V power output) through the rectifier filter circuit 3. The chip 2TMS320F28335+EPM570F256C5N collects the contactor status control PWM and output control contactor according to the needs of the energy storage system; S2: The energy storage contactor control includes two control signal circuits, PWM_Drive and RELAY_Control_DO. The contactor can only be closed when both signals are satisfied at the same time. The energy storage contactor control circuit mainly includes PWM drive circuit, Boost circuit, Boost feedback circuit (overvoltage protection circuit) and control action output circuit. The drive PWM signal is generated by the control chip. The Boost circuit controls the closing process voltage and holding voltage of the energy storage contactor. The rated closing voltage of the contactor is DC24V. S3: At time T0, contactor 5 is in the open state; (energy storage) contactor 5 receives the closing signal at time T1, and the control chip loads the EPwm1Regs.CMPA register data according to the duty cycle to generate an increasing PWM_Drive to drive the Boost circuit to boost the voltage. At the same time, RELAY_Control_DO=1 outputs a high level. The control circuit adds the Boost voltage to both ends of the energy storage contactor coil. As the voltage increases, the current increases, and the magnetic field attraction increases, pulling the moving iron core to accelerate the closing; at time T2, when the contactor is about to close (before closing), the PWM_Drive drive changes from "increasing" to "rapidly decreasing" to reduce the speed of the moving iron core , effectively reducing the collision intensity of the dynamic and static iron cores; at time T3, the contactor is closed and in the holding process, PWM_Drive drives EPwm1Regs.CMPA=0 to close, and the energy storage contactor is held at low voltage DC12V (50%Un), reducing the holding power consumption of the energy storage contactor, improving the efficiency of the energy storage system, and greatly reducing the working temperature rise of the energy storage contactor; at time T4, the contactor opening command is received, the control chip controls RELAY_Control_DO=0 to output a low level, and the energy storage contactor begins to shut down; at time T5, the energy storage contactor completes the opening.

[0024] The core idea of ​​this program is: 1) PWM_Drive control based on high-speed controller: Based on the PWM control of the controller, the closing process and holding voltage of the energy storage contactor, the "increasing" PWM_Drive drive can suppress the power drop of the energy storage system control power supply during the closing process of the energy storage contactor, and reduce the interference effect on ADC sampling; the "decreasing" PWM_Drive drive can effectively reduce the violent collision of the dynamic and static iron cores, reduce the damage to the dynamic and static iron cores, extend the service life of the contactor, and increase the trouble-free operation time of the energy storage system; the contactor coil 50%Un during the holding process can reduce the power consumption of the energy storage contactor, reduce the temperature rise of the contactor, and also reduce the contactor shutdown peak voltage.

[0025] 2) Based on Boost control and output control hardware circuit: The present invention adopts 150MHz high-speed control chip TMS320F28335+EPM570F256C5N to control the Boost circuit voltage output, flexibly adjust the energy storage contactor coil voltage between 50%Un--100%Un, reduce the impact of the contactor closing process on the energy storage system control power supply and the power consumption of the holding process; the contactor closing must be during the Boost circuit voltage output & control circuit RELAY_Control_DO signal output, which can effectively avoid contactor malfunction and bounce; when on, a diode and a resistor are connected in parallel at both ends of the inductive load coil to provide a discharge circuit for the energy stored in the electromagnetic coil, thereby suppressing the transient shutdown voltage of the coil.

[0026] This solution aims at the wear of the dynamic and static contacts, the drop of the energy storage control power supply, and the abnormal ADC sampling during the closing process of the energy storage contactor. The present invention adopts the PWM voltage regulation control type with increasing and decreasing duty cycle adjustment, which can effectively reduce the violent collision of the dynamic and static iron cores, reduce the impact of the energy storage control power supply drop and ADC sampling, and greatly improve the service life of the energy storage contactor and the trouble-free operation time (MTBF) of the energy storage equipment; In view of the large energy consumption and high temperature rise of the energy storage contactor during the holding process, the present invention adopts a voltage reduction and holding (voltage reduction and half-voltage holding) method for energy storage power supply during the holding process. By voltage reduction and holding (half-voltage holding) of energy storage power supply during the holding process, the power consumption and temperature rise of the contactor during the holding process are reduced to achieve energy-saving control of the contactor. In view of the instantaneous voltage spike when the energy storage contactor is turned off and the ADC sampling interference, the present invention adopts the diode freewheeling method, connects a diode in parallel at both ends of the inductive load coil, and provides a discharge circuit for the energy stored in the electromagnetic coil, thereby reducing the transient voltage of the coil. The diode is connected in series at both ends of the electromagnetic coil to assist in eliminating the voltage spike when the coil is turned off.

[0027] This solution controls the coil voltage during the core closing process based on the PWM_Drive drive signal to suppress closing collision; during the holding process, half-voltage is maintained to control the coil current to achieve energy-saving control; during the opening process, diodes and resistors are connected in parallel at both ends of the coil to suppress the transient turn-off voltage spike of the coil; and it also has overvoltage protection.

[0028] The present invention relates to a contactor control system for energy storage. It includes: a flyback power supply 1, which supplies power to the chip 2 through a power supply circuit. The rectifier filter circuit 3 is connected to the coil drive circuit 4, and the chip 2 controls the output of the coil drive circuit 4 through a PWM pulse signal, and the chip 2 acts on the contactor 5 through the output control; Chip 2 is a controller chip, and the controller chip uses TMS320F28335+EPM570F256C5N; Chip 2 collects contactor status control PWM and output control contactor according to the needs of the energy storage system; The PWM pulse signal is connected to the Boost circuit through the PWM drive circuit; The PWM driving circuit includes a resistor R4, one end of which is connected to one end of a capacitor C3 and one end of a voltage-stabilizing diode D1 respectively, the other end of the voltage-stabilizing diode D1 is connected to one end of a resistor R5, and the other end of the voltage-stabilizing diode D1 is connected to the cathode of a diode D2, and the other end of the voltage-stabilizing diode D1 is connected to an overvoltage protection circuit at the same time, the anode of the diode D2 is grounded, and the diode D2 is a clamping diode to prevent negative voltage from being generated; the other end of the resistor R5 is connected to one end of the push-pull circuit and one end of the resistor R6 respectively; the other end of the capacitor C3 is grounded, and the other end of the resistor R6 is grounded; The push-pull circuit includes an NPN transistor Q3 and a PNP transistor Q4, wherein the emitter of the NPN transistor Q3 is connected to the emitter of the PNP transistor Q4, and resistors R5 and R6 are connected to the bases of the NPN transistor Q3 and the PNP transistor Q4, wherein the resistor R5 is a driving resistor, driving the NPN transistor Q3 and the PNP transistor Q4; R6 and R5 divide the voltage to maintain the driving voltage; the collector of the NPN transistor Q3 is connected to a 12V power supply, the collector of the PNP transistor Q4 is grounded, and the emitter of the PNP transistor Q4 and the emitter of the NPN transistor Q3 are connected to the Boost circuit through a resistor R9; An overvoltage protection circuit is provided between the PWM drive circuit and the Boost circuit. The overvoltage protection circuit includes a resistor R1, one end of the resistor R1 is connected to the 24v power supply output end of the Boost circuit, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 is grounded, wherein the resistor R2 is connected in parallel with the capacitor C1, the resistance values ​​of the resistor R1 and the resistor R2 are equal, the other end of the resistor R1 and one end of the resistor R2 are connected to the emitter of the PNP transistor Q1, the base of the PNP transistor Q1 is connected to the 12v power supply, the collector of the PNP transistor Q1 is connected to one end of the resistor R3, and the collector of the PNP transistor Q1 is connected to the base of the NPN transistor Q2, the other end of the resistor R3 is connected to the emitter of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, and the collector of the NPN transistor Q2 is connected to the anode end of the voltage regulator diode D1. Overvoltage protection principle: When the contactor feedback voltage +24V_RELAY is greater than 24V, after the voltage is divided by resistors R1 and R2 (resistance value of resistor R1 = resistance value of resistor R2), the emitter voltage of PNP transistor Q1 is greater than its base voltage, PNP transistor Q1 is turned on, and then the base of NPN transistor Q2 is charged with 12V to drive NPN transistor Q2 to turn on, forcing PWM_Drive to be pulled down (GND) to turn off the contactor boost drive pulse, thereby playing the contactor drive power supply 24V overvoltage protection function; The Boost circuit includes a 12V power input terminal, which is connected in series with an inductor L through a fuse R7, and R7 is a self-recovering fuse, which is disconnected when the circuit is overcurrent, and is restored after the overcurrent disappears, thus playing an overcurrent protection role; the inductor L is connected to a rectifier diode D3, and an NMOS tube Q5 is connected between the inductor L and the rectifier diode D3, and the gate of the NMOS tube Q5 is connected to a resistor R9, and the gate of the NMOS tube Q5 is connected to a PWM drive circuit through the resistor R9, specifically, the NMOS tube Q5 is connected to the emitter of the PNP transistor Q4 and the emitter of the NPN transistor Q3 through the resistor R9; the source of the NMOS tube Q5 is grounded, the gate of the NMOS tube Q5 is connected to one end of the resistor R8, and the other end of the resistor R8 is grounded; the cathode of the rectifier diode D3 is connected to the 24V power output terminal; In the specific Boost circuit, electrolytic capacitors E1, E2, E3 and E5 are connected in parallel between the ground line and the power line. The above electrolytic capacitors play a filtering role. At the same time, resistor R10, non-polar capacitor C2 and non-polar capacitor C4 are also connected in parallel between the ground line and the power line. R10 is a dummy load to prevent the no-load voltage from floating high. The output end of the 24V power supply is connected to one end of the resistor R11, the other end of R11 is connected to the contactor coil, the contactor coil and R11 are connected in parallel with a spike absorption circuit, the spike absorption circuit includes a diode D6 and a resistor R12, the anode of the diode D16 is connected to the contactor coil, the cathode of the diode D6 is connected to one end of the resistor R12, and the other end of R12 is connected to one end of R11; the specific principle of suppressing the contactor shutdown voltage spike: the diode D6 is connected in parallel at both ends of the contactor coil to provide a discharge circuit for the energy stored in the contactor electromagnetic coil, thereby reducing the transient voltage of the coil; that is, when the contactor is disconnected, the diode in parallel with the contactor electromagnetic coil changes from a reverse bias state to a forward bias state for continuous current flow, and absorbs the shutdown voltage spike in a timely and effective manner through R12.

[0029] The contactor coil of contactor 5 is connected to the control circuit, which includes a voltage regulator diode D4. The anode of the voltage regulator diode D4 is connected to one end of R13. The voltage regulator diode D4 prevents jitter principle: the PWM drive voltage is 3.3V, which is greater than or equal to 3.3V. The voltage regulator diode D1 is turned on, and the BOOST circuit is driven normally to prevent the BOOST circuit from malfunctioning when the voltage is lower than 3.3V; the other end of R13 is connected to the base of the NPN transistor Q6, and R13 is a driving resistor that drives the NPN transistor Q6; one side of the voltage regulator diode D4 is connected to one end of the capacitor C4, and the other end of C4 is connected to the base of the NPN transistor Q6. One end is grounded, the other end of R13 is connected to one end of diode D5 and one end of resistor R14, the other ends of diode D5 and resistor R14 are grounded, and R14 and R13 divide the voltage to maintain the driving voltage; D5 is a clamping diode to prevent negative voltage from being generated; the collector of NPN transistor Q6 is connected to one end of the contactor coil, and the collector of NPN transistor Q6 is connected to one end of non-polar capacitor C5, the emitter of NPN transistor Q6 is grounded, and the non-polar capacitor C5 is connected to the emitter of NPN transistor Q6, and the non-polar capacitor C5 suppresses the turn-off voltage spike of NPN transistor Q6.

[0030] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for controlling a contactor for energy storage, characterized in that: The steps include: S1: Multiple power supplies are input to the flyback power supply, the flyback power supply supplies power to the chip through the power supply circuit, and the flyback power supply supplies power to the contactor drive circuit through the rectifier filter circuit 3; S2: The energy storage contactor control includes two control signal circuits, PWM_Drive and RELAY_Control_DO. When the two signals are satisfied at the same time, the contactor is closed. The energy storage contactor control circuit mainly includes PWM drive circuit, Boost circuit, Boost feedback circuit and control action output circuit. The drive PWM signal is generated by the control chip. The Boost circuit controls the closing process voltage and holding voltage of the energy storage contactor. The rated closing voltage of the contactor is DC24V. S3: At time T0, the contactor is in the open state; at time T1, the contactor receives the closing signal, and the control chip loads the EPwm1Regs.CMPA register data according to the duty cycle to generate an increasing PWM_Drive to drive the Boost circuit to boost the voltage. At the same time, RELAY_Control_DO=1 outputs a high level. The control circuit adds the Boost voltage to both ends of the energy storage contactor coil. As the voltage increases, the current increases, and the magnetic field attraction increases, pulling the moving iron core to accelerate the closing; at time T2, when the contactor is about to close, the PWM_Drive drive changes from increasing to rapidly decreasing to reduce the speed of the moving iron core; at time T3, the contactor is closed and is in the holding process. PWM_Drive drives EPwm1Regs.CMPA=0 to close, and the energy storage contactor is held with a low voltage DC12V. At time T4, the contactor receives the opening command, and the control chip controls RELAY_Control_DO=0 to output a low level, and the energy storage contactor begins to shut down; at time T5, the energy storage contactor completes the opening.

2. The energy storage contactor control method according to claim 1, characterized in that: The method relates to a contactor control system for energy storage, characterized in that it comprises: a flyback power supply, which supplies power to a chip through a power supply circuit, the flyback power supply is connected to a coil drive circuit through a rectifier filter circuit, the chip controls the output of the coil drive circuit through a PWM pulse signal, and the chip acts on the contactor through the output control; The PWM pulse signal acts on the Boost circuit through the PWM drive circuit; The PWM driving circuit includes a resistor R4, one end of which is respectively connected to one end of a capacitor C3 and one end of a voltage-stabilizing diode D1, the other end of the voltage-stabilizing diode D1 is connected to one end of a resistor R5, and the other end of the voltage-stabilizing diode D1 is connected to a cathode of a diode D2, the other end of the voltage-stabilizing diode D1 is also connected to an overvoltage protection circuit, the anode of the diode D2 is grounded, the other end of the resistor R5 is respectively connected to one end of a push-pull circuit and one end of a resistor R6; the other end of the capacitor C3 is grounded, and the other end of the resistor R6 is grounded.

3. The contactor control system for energy storage according to claim 2, characterized in that: The push-pull circuit includes an NPN transistor Q3 and a PNP transistor Q4, the emitter of the NPN transistor Q3 is connected to the emitter of the PNP transistor Q4, resistors R5 and R6 are connected to the bases of the NPN transistor Q3 and the PNP transistor Q4, the collector of the NPN transistor Q3 is connected to a 12V power supply, the collector of the PNP transistor Q4 is grounded, and the emitter of the PNP transistor Q4 is connected to the Boost circuit via a resistor R9.

4. The contactor control system for energy storage according to claim 3, characterized in that: The chip is a controller chip, and the controller chip is TMS320F28335+ EPM570F256C5N.

5. The contactor control system for energy storage according to claim 4, characterized in that: An overvoltage protection circuit is provided between the PWM drive circuit and the Boost circuit. The overvoltage protection circuit includes a resistor R1. The other end of the resistor R1 is connected to one end of the resistor R2. The other end of the resistor R2 is grounded. The resistance values ​​of the resistors R1 and R2 are equal. The other end of the resistor R1 and one end of the resistor R2 are connected to the emitter of the PNP transistor Q1. The base of the PNP transistor Q1 is connected to a 12V power supply. The collector of the PNP transistor Q1 is connected to one end of the resistor R3. At the same time, the collector of the PNP transistor Q1 is connected to the base of the NPN transistor Q2. The other end of the resistor R3 is connected to the emitter of the NPN transistor Q2. The emitter of the NPN transistor Q2 is grounded. The collector of the NPN transistor Q2 is connected to the anode end of the voltage-stabilizing diode D1.

6. The contactor control system for energy storage according to claim 5, characterized in that: The Boost circuit includes a 12V power input terminal, which is connected in series with an inductor L through a fuse R7, and the inductor L is connected to a rectifier diode D3. An NMOS tube Q5 is connected between the inductor L and the rectifier diode D3, and a gate of the NMOS tube Q5 is connected to a resistor R9, and the gate of the NMOS tube Q5 is connected to a PWM drive circuit through the resistor R9. The source of the NMOS tube Q5 is grounded, and the gate of the NMOS tube Q5 is connected to one end of a resistor R8, and the other end of the resistor R8 is grounded; the cathode of the rectifier diode D3 is connected to a 24V power output terminal.

7. The contactor control system for energy storage according to claim 6, characterized in that: In the Boost circuit, electrolytic capacitors E1, E2, E3 and E5 are connected in parallel between the ground wire and the power line. The above electrolytic capacitors play a filtering role. At the same time, resistor R10, non-polar capacitor C2 and non-polar capacitor C4 are also connected in parallel between the ground wire and the power line. R10 is a dummy load to prevent the no-load voltage from floating high; the 24V power supply output end is connected to one end of resistor R11, and the other end of R11 is connected to the contactor coil. The contactor coil and R11 are connected in parallel with a spike absorption circuit. The spike absorption circuit includes a diode D6 and a resistor R12. The anode of the diode D16 is connected to the contactor coil, the cathode of the diode D6 is connected to one end of the resistor R12, and the other end of R12 is connected to one end of R11.

8. The contactor control system for energy storage according to claim 7, characterized in that: The contactor coil of the contactor 5 is connected to the control circuit, which includes a voltage stabilizing diode D4, an anode of the voltage stabilizing diode D4 is connected to one end of R13, and the other end of R13 is connected to the base of the NPN transistor Q6. R13 is a driving resistor that drives the NPN transistor Q6; one side of the voltage stabilizing diode D4 is connected to one end of the capacitor C4, and the other end of C4 is grounded. The other end of R13 is connected to one end of a diode D5 and one end of a resistor R14, and the other ends of the diode D5 and the resistor R14 are grounded. The collector of the NPN transistor Q6 is connected to one end of the contactor coil, and the collector of the NPN transistor Q6 is connected to one end of the non-polar capacitor C5, the emitter of the NPN transistor Q6 is grounded, and the non-polar capacitor C5 is connected to the emitter of the NPN transistor Q6.

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