Contactor control system for energy storage

Abstract

The utility model relates to the field of contactor control, in particular to a contactor control system for energy storage. Comprising a flyback power supply which supplies power to a chip through a power supply circuit, the flyback power supply is connected with a coil driving circuit through a rectification filter circuit, the chip controls the output of the coil driving circuit through a PWM pulse signal, and the chip acts on a contactor through output control; according to the utility model, based on the PWM Drive driving signal of the high-speed controller and the Boost circuit, the PWM duty ratio of closing and holding is intelligently adjusted in the closing process and the holding process, so that the voltages at the two ends of the electromagnetic coil are adjusted to realize the effects of suppressing closing collision in the closing process and optimally saving energy in the holding process; and meanwhile, falling and electromagnetic interference on an energy storage control power supply are inhibited.

Description

Technical Field

[0001] The utility model relates to the field of contactor control, in particular to a contactor control system for energy storage. Background Art

[0002] Electrochemical energy storage has developed rapidly in recent years. AC / DC contactors, as key electrical components in energy storage systems, have garnered widespread attention in contactor research. Energy storage contactors use a "rated voltage" for the contactor coil during the closing process. This sudden, impactful closing not only causes mechanical wear but also produces a harsh closing noise, impacting the controller's ADC sampling. Furthermore, it can easily cause severe contact bounce, leading to arcing and electrical erosion, severely shortening the contactor's service life. Losses from closing and contact bounce are primarily caused by the intensity of the closing collision. Furthermore, a "rated voltage" significantly exceeding the required holding voltage results in energy waste. During the contactor's closing process, the moment the inductive load in the electromagnetic mechanism is de-energized, a voltage spike significantly exceeding the supply voltage occurs, threatening circuit safety.

[0003] In general, there are several problems with current energy storage contactors:

[0004] 1. Energy storage contactors use the "rated voltage" of the contactor coil during the closing process, causing violent collisions between the moving and static cores. Lack of effective control of the contactor coil's control voltage during the closing process can easily cause violent collisions between the moving and static cores, resulting in strong pull-in noise at the moment of closing. This can also cause wear and erosion of the main contacts, accelerate contact damage, and cause problems such as voltage drops in the energy storage auxiliary power supply and interference with ADC sampling, increasing the failure rate of the energy storage system.

[0005] 2. Energy storage contactors consume a lot of power and increase their temperature during the holding process. The actual contactor's holding state only requires a small electromagnetic 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.

[0006] 3. The voltage spike at the moment the energy storage contactor is turned off is too high. The rapid opening of the contactor's electromagnetic mechanism at the moment of shutdown generates a voltage spike several times higher than the power supply voltage, causing electromagnetic radiation interference and posing a threat to the contactor drive circuit, ADC sampling, and system control power supply voltage.

[0007] Current energy storage contactors have problems such as engagement noise, contact damage, control voltage source drop, and 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 energy storage systems. Utility Model Content

[0008] In order to solve the problems of the prior art, the utility model provides a contactor control system for energy storage.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A contactor control system for energy storage includes: 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 and 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;

[0011] The PWM pulse signal acts on the Boost circuit through the PWM drive circuit;

[0012] The PWM drive circuit includes a resistor R4, one end of which is respectively connected to one end of the capacitor C3 and one end of the Zener diode D1, the other end of the Zener diode D1 is connected to one end of the resistor R5, and the other end of the Zener diode D1 is connected to the cathode of the diode D2. The other end of the Zener diode D1 is also connected to the 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 the push-pull circuit and one end of the resistor R6; the other end of the capacitor C3 is grounded, and the other end of the resistor R6 is grounded.

[0013] 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;

[0014] The chip is a controller chip, and the controller chip uses TMS320F28335+ EPM570F256C5N.

[0015] 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 regulator diode D1.

[0016] The boost circuit includes a 12V power input terminal, which is connected in series with an inductor L via a fuse R7. The inductor L is connected to a rectifier diode D3. An NMOS transistor Q5 is connected between the inductor L and the rectifier diode D3. The gate of the NMOS transistor Q5 is connected to a resistor R9, and the gate of the NMOS transistor Q5 is connected to a PWM drive circuit via the resistor R9. The source of the NMOS transistor Q5 is grounded, and the gate of the NMOS transistor Q5 is connected to one end of a resistor R8. The other end of the resistor R8 is grounded. The cathode of the rectifier diode D3 is connected to the 24V power output terminal.

[0017] In the Boost circuit, electrolytic capacitors E1, E2, E3, and E5 are connected in parallel between the ground line and the power line. The above-mentioned 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 24V power supply output end is connected to one end of the 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.

[0018] The contactor coil of contactor 5 is connected to a control circuit, which includes a voltage regulator diode D4, the anode of which is connected to one end of R13, the other end of which is connected to the base of an 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 a capacitor C4, the other end of which is grounded, the other end of R13 is connected to one end of a diode D5 and one end of a resistor R14, 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-polarized capacitor C5, the emitter of the NPN transistor Q6 is grounded, and the non-polarized capacitor C5 is connected to the emitter of the NPN transistor Q6.

[0019] Compared with the existing technology, the beneficial effects of the utility model are: based on the PWM_Drive drive signal and Boost boost circuit of the high-speed controller, the utility model 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0021] Figure 1 This is a hardware block diagram of the utility model.

[0022] Figure 2 This is the control principle of the utility model Figure 1 .

[0023] Figure 3 This is the control principle of the utility model Figure 2 .

[0024] Figure 4 This is a control strategy diagram of the contactor of this utility model.

[0025] Figure 5 This is a control flow chart of the contactor of the utility model. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below through examples. The examples are only used to illustrate the present invention and do not limit the scope of the present invention.

[0027] A contactor control system for energy storage,

[0028] It includes: a flyback power supply 1, which supplies power to the chip 2 through a power supply circuit.

[0029] The rectifier filter circuit 3 is connected to the coil drive circuit 4. The chip 2 controls the output of the coil drive circuit 4 through a PWM pulse signal. The chip 2 acts on the contactor 5 through the output control.

[0030] Chip 2 is the controller chip, which uses TMS320F28335+EPM570F256C5N. Chip 2 collects contactor status and controls PWM and output control of the contactor according to the needs of the energy storage system.

[0031] The PWM pulse signal acts on the Boost circuit through the PWM drive circuit;

[0032] The PWM drive 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. 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 diode D2 is a clamping diode to prevent the generation of negative voltage. 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.

[0033] 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. Resistor R5 is a driving resistor that drives 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, and the collector of the PNP transistor Q4 is grounded. The emitter of the PNP transistor Q4 and the emitter of the NPN transistor Q3 are connected to the Boost circuit via resistor R9.

[0034] An overvoltage protection circuit is provided between the PWM drive circuit and the Boost circuit.

[0035] 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, the voltage is divided by resistors R1 and R2 (resistor R1 value = resistor R2 value), and 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, driving NPN transistor Q2 to turn on. PWM_Drive is forced to be pulled low (GND), turning off the contactor boost drive pulse, thereby providing overvoltage protection for the contactor drive power supply 24V.

[0036] The boost circuit includes a 12V power input terminal, which is connected in series with an inductor L via a fuse R7. R7 is a resettable fuse that disconnects when the circuit is overcurrent and recovers after the overcurrent disappears, thereby providing overcurrent protection. The inductor L is connected to a rectifier diode D3. An NMOS transistor Q5 is connected between the inductor L and the rectifier diode D3. The gate of the NMOS transistor Q5 is connected to a resistor R9, and the gate of the NMOS transistor Q5 is connected to a PWM drive circuit via the resistor R9. Specifically, the NMOS transistor Q5 is connected to the emitter of the PNP transistor Q4 and the emitter of the NPN transistor Q3 via the resistor R9. The source of the NMOS transistor Q5 is grounded, and the gate of the NMOS transistor Q5 is connected to one end of a resistor R8. The other end of the resistor R8 is grounded. The cathode of the rectifier diode D3 is connected to the 24V power output terminal.

[0037] 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.

[0038] The 24V power supply output end is connected to one end of the resistor R11, the other end of R11 is connected to the contactor coil, and 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 is as follows: 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.

[0039] The contactor coil of contactor 5 is connected to the control circuit, which includes a Zener diode D4. The anode of Zener diode D4 is connected to one end of R13. The Zener diode D4 prevents jitter principle: the PWM drive voltage is 3.3V, which is greater than or equal to 3.3V. Zener diode D1 is turned on, normally driving the BOOST circuit to prevent malfunction of the BOOST circuit when the voltage is lower than 3.3V; the other end of R13 is connected to the base of NPN transistor Q6, R13 is a driving resistor, driving NPN transistor Q6; one side of Zener diode D4 is connected to one end of capacitor C4, and the other end of C4 is connected to the base of NPN transistor Q6. One end is grounded, and 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. R14 and R13 divide the voltage to maintain the driving voltage. D5 is a clamping diode to prevent negative voltage. The collector of NPN transistor Q6 is connected to one end of the contactor coil. At the same time, the collector of NPN transistor Q6 is connected to one end of non-polar capacitor C5. The emitter of NPN transistor Q6 is grounded. At the same time, non-polar capacitor C5 is connected to the emitter of NPN transistor Q6. Non-polar capacitor C5 suppresses the turn-off voltage spike of NPN transistor Q6.

[0040] The implementation of a contactor control system for energy storage includes the following steps:

[0041] S1: Multiple power supplies are input to flyback power supply 1, which then supplies power to chip 2 via the power supply circuit. This power is then supplied to the contactor drive circuit (24V power output) via the rectifier filter circuit 3. Chip 2, TMS320F28335+EPM570F256C5N, collects contactor status control PWM and output control according to the energy storage system's needs.

[0042] S2: The energy storage contactor control includes two control signal circuits: PWM_Drive and RELAY_Control_DO. The contactor can only close when both signals are satisfied. The energy storage contactor control circuit mainly includes a PWM drive circuit, a Boost circuit, a Boost feedback circuit (overvoltage protection circuit), and a 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.

[0043] S3: At time T0, contactor 5 is in the open state; (energy storage) contactor 5 receives the closing signal at time T1. 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 applies 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 operating 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.

[0044] The core concept of this program is:

[0045] 1) PWM_Drive control based on a high-speed controller: The controller's PWM controls the closing process and holding voltage of the energy storage contactor. The "increasing" PWM_Drive drive can suppress the drop in the energy storage system control power supply during the energy storage contactor closing process, reducing the interference with ADC sampling. The "decreasing" PWM_Drive drive can effectively reduce the violent collision of the dynamic and static iron cores, reduce 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. During the holding process, the contactor coil is 50% Un, which can reduce the power consumption of the energy storage contactor, reduce the contactor temperature rise, and also reduce the contactor shutdown spike voltage.

[0046] 2) Based on Boost control and output control hardware circuit: This utility model uses the 150MHz high-speed control chip TMS320F28335 + EPM570F256C5N to control the Boost circuit voltage output, flexibly adjusting the energy storage contactor coil voltage between 50%Un and 100%Un, reducing the impact of the contactor closing process on the energy storage system control power supply and the power consumption during the holding process; contactor closing must be based on the Boost circuit voltage output and control circuit RELAY_Control_DO signal output, which can effectively avoid contactor malfunction and bounce; when on, a diode and 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, suppressing the coil's transient shutdown voltage.

[0047] This solution addresses the wear of the dynamic and static contacts, energy storage control power drop, and ADC sampling anomalies during the closing process of the energy storage contactor. This utility model adopts a PWM voltage regulation control method with increasing and decreasing duty cycles. This can effectively reduce the impact of dynamic and static core collisions, reduce the impact of energy storage control power 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.

[0048] In view of the high energy consumption and high temperature rise of the energy storage contactor during the holding process, the utility model adopts the energy storage power supply voltage reduction and holding (half-voltage holding) method during the holding process. By reducing the power consumption and temperature rise of the contactor during the holding process, the energy storage power supply voltage reduction and holding (half-voltage holding) are reduced to achieve energy-saving control of the contactor.

[0049] To address the voltage spikes and ADC sampling interference associated with the instantaneous shutdown of energy storage contactors, this utility model utilizes a diode freewheeling method. A diode is connected in parallel across the inductive load coil, providing a discharge path for the energy stored in the electromagnetic coil and reducing the coil's transient voltage. A diode connected in series across the electromagnetic coil also helps eliminate the voltage spikes associated with the coil's shutdown.

[0050] This solution uses the PWM_Drive drive signal to control the coil voltage during the core closing process to suppress closing collisions; during the holding process, half-voltage maintenance is used 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.

[0051] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection 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, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A contactor control system for energy storage, characterized in that: include: The flyback power supply supplies power to the chip through the power supply circuit. The flyback power supply is connected to the coil drive circuit through the rectifier and filter circuit. The chip controls the output of the coil drive circuit through the PWM pulse signal. 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 drive circuit includes a resistor R4, one end of which is respectively connected to one end of the capacitor C3 and one end of the Zener diode D1, the other end of the Zener diode D1 is connected to one end of the resistor R5, and the other end of the Zener diode D1 is connected to the cathode of the diode D2. The other end of the Zener diode D1 is also connected to the 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 the push-pull circuit and one end of the resistor R6; the other end of the capacitor C3 is grounded, and the other end of the resistor R6 is grounded.

2. The energy storage contactor control system according to claim 1, 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. The emitter of the PNP transistor Q4 is connected to the emitter of the NPN transistor Q3 via resistor R9, which is connected to the Boost circuit.

3. The energy storage contactor control system according to claim 2, characterized in that: The chip is a controller chip, and the controller chip uses TMS320F28335+ EPM570F256C5N.

4. The energy storage contactor control system according to claim 3, 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 regulator diode D1.

5. The energy storage contactor control system according to claim 4, characterized in that: The boost circuit includes a 12V power input terminal, which is connected in series with an inductor L via a fuse R7. The inductor L is connected to a rectifier diode D3. An NMOS transistor Q5 is connected between the inductor L and the rectifier diode D3. The gate of the NMOS transistor Q5 is connected to a resistor R9, and the gate of the NMOS transistor Q5 is connected to a PWM drive circuit via the resistor R9. The source of the NMOS transistor Q5 is grounded, and the gate of the NMOS transistor Q5 is connected to one end of a resistor R8. The other end of the resistor R8 is grounded. The cathode of the rectifier diode D3 is connected to the 24V power output terminal.

6. The energy storage contactor control system according to claim 5, characterized in that: In the Boost circuit, electrolytic capacitors E1, E2, E3, and E5 are connected in parallel between the ground line and the power line. The above-mentioned 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 24V power supply output end is connected to one end of the 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.

7. The energy storage contactor control system according to claim 6, characterized in that: The contactor coil of the contactor 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, 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 regulator 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 the diode D5 and one end of the 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-polarized capacitor C5. The emitter of the NPN transistor Q6 is grounded, and the non-polarized capacitor C5 is connected to the emitter of the NPN transistor Q6.

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