Energy storage battery factory explosion-proof communication control circuit

Abstract

The invention provides an explosion-proof communication control circuit for an energy storage battery factory, and relates to the technical field of power electronics, and the explosion-proof communication control circuit is characterized in that an EMC protection module is electrically connected with a BOOST module, the BOOST module and a second AC / DC module are electrically connected with an isolation transformation module, the isolation transformation module is electrically connected with a first AC / DC module, and the first AC / DC module is electrically connected with a second AC / DC module. The first AC / DC module is electrically connected with the LDO module, the LDO module is electrically connected with the MCU master control module, the MCU master control module is electrically connected with the optical coupler isolation module, the optical coupler isolation module is electrically connected with the CAN transceiver module, and the CAN transceiver module is electrically connected with the explosion-proof energy limiting module. According to the invention, the condition of the energy storage battery can be rapidly transmitted to the master control in a CAN communication mode, and effective monitoring and data transmission can be carried out even if flammable and explosive gas or dust exists around the processed and produced battery.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to an explosion-proof communication control circuit for an energy storage battery factory. Background Art

[0002] In the rapidly developing energy storage battery industry, with the continuous expansion of production scale and the improvement of automation, the safety requirements in the production process are becoming increasingly stringent. In the production and processing of energy storage batteries, due to the material characteristics and process requirements, there is often the release of flammable gases and the generation of conductive dust. These environmental factors constitute a potential explosion risk. According to international and domestic explosion-proof safety standards, such areas are defined as hazardous areas, which impose extremely high safety requirements on electrical equipment operating in such areas, that is, the equipment must have "intrinsically safe" characteristics to prevent sparks caused by equipment failures from igniting combustibles, thereby avoiding the occurrence of explosion accidents.

[0003] Traditional methods often use heavy explosion-proof boxes or explosion-proof cabinets to isolate and protect electrical control equipment. Although this design can reduce the risk of explosion to a certain extent, its large size occupies valuable production space, increases equipment costs, and is not conducive to flexible deployment and maintenance of equipment. In order to enhance the explosion-proof performance of the equipment, some products use overall glue encapsulation. Although it can effectively isolate the external environment, this process is complex and time-consuming, and it is difficult to ensure the consistency of packaging quality, which seriously restricts production efficiency and increases production costs. Traditional solutions often use external explosion-proof products to achieve control of hazardous areas. This non-integrated design not only increases the complexity and failure points of the system, but also leads to delays and instability in the transmission of control signals, reduces overall control efficiency, and is difficult to meet the needs of modern energy storage battery factories for efficient and precise control.

[0004] Therefore, an explosion-proof communication control circuit for an energy storage battery factory is proposed. Summary of the invention

[0005] This manual provides an explosion-proof communication control circuit for energy storage battery factories, which can quickly transmit the status of energy storage batteries to the main control through CAN communication. Even if there are flammable and explosive gases or dust around the processed and produced batteries, effective monitoring and data transmission can be carried out.

[0006] This specification provides an explosion-proof communication control circuit for an energy storage battery factory, including: an EMC protection module, a BOOST module, an isolation transformer module, a first AC / DC module, a second AC / DC module, an LDO module, an explosion-proof energy limiting module, a CAN transceiver module, an optocoupler isolation module, and an MCU main control module; The EMC protection module is electrically connected to the BOOST module, the BOOST module and the second AC / DC module are both electrically connected to the isolation transformer module, the isolation transformer module is electrically connected to the first AC / DC module, the first AC / DC module is electrically connected to the LDO module, the LDO module is electrically connected to the MCU main control module, the MCU main control module is electrically connected to the optocoupler isolation module, the optocoupler isolation module is electrically connected to the CAN transceiver module, and the CAN transceiver module is electrically connected to the explosion-proof energy limiting module.

[0007] Optionally, the EMC protection module includes a varistor RV1, the varistor RV1 is respectively connected to a decoupling inductor L1 and a decoupling inductor L2, the decoupling inductor L1 is connected to one end of a diode TVS1, the decoupling inductor L2 is connected to the other end of the diode TVS1, the diode TVS1 is connected to a fuse F1, the fuse F1 is connected to a capacitor C1, the capacitor C1 is connected to a cathode of the diode D1, and an anode of the diode D1 is connected to the BOOST module.

[0008] Optionally, the BOOST module includes an inductor L3, which is respectively connected to the power chip U1 and the anode of the diode D2, the power chip U1 is connected to the capacitor C2, the cathode of the diode D2 is connected to the resistor R1, the resistor R1 is respectively connected to the resistor R2 and the capacitor C2, the capacitor C2 is connected to the capacitor C3, and the capacitor C3 is connected to the isolation transformer module.

[0009] Optionally, the isolation transformer module includes a transformer U2, the transformer U2 is connected to the isolation transformer TR1A, the isolation transformer TR2A is connected to the first AC / DC module, and the isolation transformer TR3A is connected to the second AC / DC module.

[0010] Optionally, the first AC / DC module includes a half-bridge diode D6, and the half-bridge diode D6 is connected to a capacitor C10 and a capacitor C11 respectively, and the capacitor C10 and the capacitor C11 are both connected to the LDO module.

[0011] Optionally, the LDO module includes a capacitor C12, the capacitor C12 is connected to a linear capacitor LDO, the linear capacitor LDO is connected to a capacitor C13, and the capacitor C13 is connected to a capacitor C14.

[0012] Optionally, the second AC / DC module includes a half-bridge diode D16, the half-bridge diode D16 is connected to the half-bridge diode D15, the half-bridge diode D15 is connected to the capacitor C4, the capacitor C4 is connected to the capacitor C6, and the capacitor C6 is connected to the fuse F2.

[0013] Optionally, the explosion-proof energy-limiting module includes a diode TVS10, the diode TVS10 is connected to a resistor R11, the resistor R11 is respectively connected to a resistor R10 and a resistor R12, the resistor R10 is connected to an anode of a Zener diode ZD2 and an anode of a Zener diode ZD4, the cathode of the Zener diode ZD2 is connected to an anode of a Zener diode ZD1, the cathode of the Zener diode ZD4 is connected to an anode of a Zener diode ZD3, and the anode of the Zener diode ZD3 and the cathode of the Zener diode ZD1 are connected to the resistor R12.

[0014] Optionally, the CAN transceiver module includes a diode D10, the cathode of the diode D10 is respectively connected to the cathode of the diode D12 and the diode TVS11, the diode TVS11 is respectively connected to the cathode of the diode D11 and the cathode of the diode D13, the anode of the diode D11 and the anode of the diode D13 are connected to the CAN transceiver U10, the CAN transceiver U10 is connected to the resistor R14, the resistor R14 is connected to the transistor O2, the transistor O2 is connected to the resistor R21 and the collector of the transistor T2, the emitter of the transistor T2 is grounded, the base of the transistor T2 is connected to the resistor R22, and the resistor R22 is connected to the MCU main control module.

[0015] Optionally, the optocoupler isolation module includes a logic chip U12, the logic chip U12 is respectively connected to capacitor C7, capacitor C8, and resistor R13, the resistor R13 is connected to transistor O1, the transistor O1 is respectively connected to resistor R20, and the resistor R20 is connected to the MCU main control module.

[0016] In the present invention, multiple protection mechanisms, including EMC protection, explosion-proof energy-limiting modules, etc., are used to ensure the safe and stable operation of the communication control circuit in high-risk environments, such as energy storage battery factories. These protection measures can effectively prevent potential dangers such as overvoltage and overcurrent, and reduce the probability of accidents. Components such as BOOST modules and LDO modules enable the circuit to provide stable voltage output under different power supply conditions to ensure the normal operation of communication equipment. In addition, the use of isolation transformer modules and optocoupler isolation modules also enhances the anti-interference ability of the signal and improves the stability of communication. Through this control circuit, the status of the energy storage battery can be quickly transmitted to the main control through CAN communication, and even if there are flammable and explosive gases or dust around the processed and produced batteries, effective monitoring and data transmission can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of an explosion-proof communication control circuit for an energy storage battery factory provided in an embodiment of this specification; Figure 2 A schematic diagram of the principle of an explosion-proof communication control circuit for an energy storage battery factory provided in an embodiment of this specification.

[0019] The accompanying drawings illustrate: 100, EMC protection module; 200, BOOST module; 300, isolation transformer module; 400, first AC / DC module; 500, LDO module; 600, second AC / DC module; 700, explosion-proof energy-limiting module; 800, CAN transceiver module; 900, optocoupler isolation module; 1000, MCU main control module. DETAILED DESCRIPTION

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0021] The following is combined with Figure 1-2 The exemplary embodiments of the present invention are described more fully. However, the exemplary embodiments can be implemented in various forms, and it should not be understood that the present invention is limited to the embodiments set forth herein. On the contrary, providing these exemplary embodiments can make the present invention more comprehensive and complete, and it is more convenient to fully convey the inventive concept to those skilled in the art. The same reference numerals in the figures represent the same or similar elements, components or parts, and thus their repeated description will be omitted.

[0022] Under the premise of being consistent with the technical concept of the present invention, the features, structures, characteristics or other details described in a specific embodiment do not exclude that they can be combined in one or more other embodiments in a suitable manner.

[0023] In the description of specific embodiments, the features, structures, characteristics or other details described in the present invention are intended to enable those skilled in the art to fully understand the embodiments. However, it does not exclude that those skilled in the art can practice the technical solutions of the present invention without one or more of the specific features, structures, characteristics or other details.

[0024] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0025] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0026] The term "and / or" or "and / or" includes all combinations of any one or more of the associated listed items.

[0027] Figure 1 A schematic diagram of a structure of an explosion-proof communication control circuit for an energy storage battery factory provided in an embodiment of this specification includes: EMC protection module 100, BOOST module 200, isolation transformer module 300, first AC / DC module 400, second AC / DC module 600, LDO module 500, explosion-proof energy limiting module 700, CAN transceiver module 800, optocoupler isolation module 900, MCU main control module 1000; EMC protection module 100 is electrically connected to BOOST module 200, BOOST module 200 and second AC / DC module 600 are both electrically connected to isolation transformer module 300, isolation transformer module 300 is electrically connected to first AC / DC module 400, first AC / DC module 400 is electrically connected to LDO module 500, LDO module 500 is electrically connected to MCU main control module 1000, MCU main control module 1000 is electrically connected to optocoupler isolation module 900, optocoupler isolation module 900 is electrically connected to CAN transceiver module 800, and CAN transceiver module 800 is electrically connected to explosion-proof energy limiting module 700.

[0028] like Figure 2As shown, the EMC protection module 100 is the key to ensure that the entire circuit is protected from external electromagnetic interference, including a varistor RV1, which performs preliminary voltage limiting on the input voltage, and the varistor RV1 is connected to the decoupling inductor L1 and the decoupling inductor L2 respectively, and the decoupling inductor L1 is connected to one end of the diode TVS1, and the diode TVS1 includes a transient voltage suppression diode TVS1, and the decoupling inductor L1 and the decoupling inductor L2 cooperate with TVS1 to effectively absorb and suppress transient voltage spikes to prevent overvoltage from causing damage to subsequent circuits. Diode TVS1 is connected to fuse F1, fuse F1 is connected to capacitor C1, capacitor C1 is connected to the cathode of diode D1, and the anode of diode D1 is connected to BOOST module 200.

[0029] BOOST module 200 includes inductor L3, one end of inductor L3 is connected to power chip U1, provides stable current for circuit, and the other end is connected to the anode of diode D2, for rectifying and preventing current backflow. Power chip U1 is connected to capacitor C2, and capacitor C2 plays the role of smoothing current, reducing power supply noise and stabilizing voltage. The cathode of diode D2 is connected to resistor R1, and the role of resistor R1 is mainly to limit the current size and protect the circuit from excessive current impact. At the same time, resistor R1 is also connected to resistor R2 and capacitor C2, forming a network of voltage division and filtering, further improving the stability of power supply. In addition, capacitor C2 is also connected to capacitor C3, and two capacitors work together to enhance filtering effect, and provide purer power supply for subsequent isolation transformer module 300, and capacitor C3 is connected to isolation transformer module 300.

[0030] The isolation transformer module 300 includes a transformer U2, which is connected to the isolation transformer TR1A, which is connected to the first AC / DC module 400, and the isolation transformer TR3A is connected to the second AC / DC module 600, thereby effectively realizing voltage conversion and providing appropriate electrical isolation for subsequent circuits, thereby enhancing the safety and stability of the entire system.

[0031] The first AC / DC module 400 includes a half-bridge diode D6, which enables the AC power to be effectively rectified under both forward and reverse voltages, thereby converting it into pulsating DC power. Subsequently, the pulsating DC power is smoothed by capacitors C10 and C11 to reduce voltage fluctuations and power supply noise, thereby ensuring the stability of the output DC power. At the same time, capacitors C10 and C11 are both connected to the LDO module 500.

[0032] The LDO module 500 includes a capacitor C12, which is not only used to smooth the voltage input to the LDO, but also helps reduce power supply noise and provides a more stable input for the LDO. The linear capacitor LDO is responsible for adjusting and stabilizing the input voltage to a preset output voltage value to ensure that a reliable and constant power supply is provided to the electronic device. In addition, the LDO is also connected to a capacitor C13, which further smoothes the output voltage of the LDO to eliminate any possible residual fluctuations. The capacitor C13 is connected to the capacitor C14, and the two capacitors work together to enhance the stability of the power supply and ensure that the ripple and noise of the output voltage are minimized.

[0033] The second AC / DC module 600 includes a half-bridge diode D16, which is closely connected to the half-bridge diode D15, and they work together to achieve effective rectification of the alternating current. This rectification process converts the alternating current into pulsating direct current, providing a stable power supply basis for the subsequent circuit. The rectified pulsating direct current is smoothed by capacitor C4. The function of capacitor C4 is mainly to reduce voltage fluctuations and filter out high-frequency noise in the power supply, thereby ensuring the stability and purity of the direct current. Capacitor C4 is also connected to capacitor C6, and these two capacitors together form a more powerful filtering network, further enhancing the stability of the power supply. Capacitor C6 is not only used for filtering, but also connected to fuse F2, providing an overcurrent protection function for the circuit. When the current exceeds a predetermined value, fuse F2 will automatically blow, thereby cutting off the circuit to prevent damage to the equipment caused by overcurrent.

[0034] The explosion-proof energy-limiting module 700 includes a diode TVS10, which is connected to a resistor R11. That is, when an abnormally high voltage is detected in the circuit, the diode TVS10 is quickly turned on to discharge excessive energy, thereby protecting subsequent circuit components from damage. The resistor R11 connected thereto plays a current limiting role to ensure that the current will not be too large when the diode TVS10 is turned on. The resistor R11 is also connected to the resistor R10 and the resistor R12 to form a voltage-dividing network. This network can further stabilize the voltage in the circuit and prevent potential dangers caused by voltage fluctuations. The resistor R10 is connected to the anode of the voltage-stabilizing diode ZD2 and the anode of the voltage-stabilizing diode ZD4, the cathode of the voltage-stabilizing diode ZD2 is connected to the anode of the voltage-stabilizing diode ZD1, the cathode of the voltage-stabilizing diode ZD4 is connected to the anode of the voltage-stabilizing diode ZD3, and the anode of the voltage-stabilizing diode ZD3 and the cathode of the voltage-stabilizing diode ZD1 are connected to the resistor R12. These voltage-stabilizing diodes have precise voltage-stabilizing characteristics and can provide a stable reference voltage in the circuit. At the same time, their connection method also forms a voltage balance loop, ensuring that when an abnormality occurs in the circuit, the excessive increase in voltage can be limited through mutual interaction.

[0035] The CAN transceiver module 800 includes a diode D10, the cathode of which is connected to the cathode of the diode D12 and the diode TVS11, respectively, which helps to clamp the voltage through the unidirectional conductivity of the diode when a surge voltage or transient overvoltage appears on the CAN bus, thereby protecting the subsequent circuit components from damage. The diode TVS11 is connected to the cathode of the diode D11 and the cathode of the diode D13, respectively, and the anode of the diode D11 and the anode of the diode D13 are connected to the CAN transceiver U10, the CAN transceiver U10 is connected to the resistor R14, the resistor R14 is connected to the transistor O2, the transistor O2 is connected to the resistor R21 and the collector of the transistor T2, the emitter of the transistor T2 is grounded, the base of the transistor T2 is connected to the resistor R22, and the resistor R22 is connected to the MCU main control module 1000.

[0036] The optocoupler isolation module 900 includes a logic chip U12, which is respectively connected to capacitor C7, capacitor C8, and resistor R13, which is connected to transistor O1, which is respectively connected to resistor R20, and which is connected to the MCU main control module 1000. The optocoupler isolation module 900 realizes electrical isolation and accurate transmission of signals, providing important guarantees for the safe and stable operation of the entire system. At the same time, the close cooperation between the module and the MCU main control module 1000 enables the system to respond quickly to various situations, thereby improving the overall control efficiency and reliability.

[0037] In the present invention, multiple protection mechanisms, including EMC protection, explosion-proof energy-limiting module 700, etc., are used to ensure the safe and stable operation of the communication control circuit in high-risk environments, such as energy storage battery factories. These protection measures can effectively prevent potential dangers such as overvoltage and overcurrent, and reduce the probability of accidents. Components such as BOOST module 200 and LDO module 500 enable the circuit to provide a stable voltage output under different power supply conditions to ensure the normal operation of the communication equipment. In addition, the use of isolation transformer module 300 and optocoupler isolation module 900 also enhances the anti-interference ability of the signal and improves the stability of communication. Through this control circuit, the status of the energy storage battery can be quickly transmitted to the main control through CAN communication, and even if there are flammable and explosive gases or dust around the processed and produced batteries, effective monitoring and data transmission can be carried out.

[0038] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the present invention is not inherently related to any specific computer, virtual device or electronic device, and various general devices can also implement the present invention. The above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0039] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0040] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An explosion-proof communication control circuit for an energy storage battery factory, characterized in that: include: EMC protection module (100), BOOST module (200), isolation transformer module (300), first AC / DC module (400), second AC / DC module (600), LDO module (500), explosion-proof energy-limiting module (700), CAN transceiver module (800), optocoupler isolation module (900), MCU main control module (1000); The EMC protection module (100) is electrically connected to the BOOST module (200); the BOOST module (200) and the second AC / DC module are both electrically connected to the isolation transformer module (300); the isolation transformer module (300) is electrically connected to the first AC / DC module (400); the first AC / DC module (400) is electrically connected to the LDO module (500); the LDO module (500) is electrically connected to the MCU main control module (1000); the MCU main control module (1000) is electrically connected to the optical coupling isolation module (900); the optical coupling isolation module (900) is electrically connected to the CAN transceiver module (800); and the CAN transceiver module (800) is electrically connected to the explosion-proof energy limiting module (700).

2. The explosion-proof communication control circuit for energy storage battery factory according to claim 1, characterized in that: The EMC protection module (100) comprises a varistor RV1, the varistor RV1 is connected to a decoupling inductor L1 and a decoupling inductor L2 respectively, the decoupling inductor L1 is connected to one end of a diode TVS1, the decoupling inductor L2 is connected to the other end of the diode TVS1, the diode TVS1 is connected to a fuse F1, the fuse F1 is connected to a capacitor C1, the capacitor C1 is connected to a cathode of the diode D1, and an anode of the diode D1 is connected to the BOOST module (200).

3. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 2, characterized in that: The BOOST module (200) comprises an inductor L3, the inductor L3 is respectively connected to a power chip U1 and an anode of a diode D2, the power chip U1 is connected to a capacitor C2, the cathode of the diode D2 is connected to a resistor R1, the resistor R1 is respectively connected to a resistor R2 and a capacitor C2, the capacitor C2 is connected to a capacitor C3, and the capacitor C3 is connected to the isolation transformer module (300).

4. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 3, characterized in that: The isolation transformer module (300) comprises a transformer U2, the transformer U2 is connected to an isolation transformer TR1A, the isolation transformer TR2A is connected to the first AC / DC module (400), and the isolation transformer TR3A is connected to the second AC / DC module.

5. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 4, characterized in that: The first AC / DC module (400) comprises a half-bridge diode D6, the half-bridge diode D6 is respectively connected to a capacitor C10 and a capacitor C11, and the capacitor C10 and the capacitor C11 are both connected to the LDO module (500).

6. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 5, characterized in that: The LDO module (500) comprises a capacitor C12, wherein the capacitor C12 is connected to a linear capacitor LDO, wherein the linear capacitor LDO is connected to a capacitor C13, and wherein the capacitor C13 is connected to a capacitor C14.

7. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 6, characterized in that: The second AC / DC module includes a half-bridge diode D16, the half-bridge diode D16 is connected to the half-bridge diode D15, the half-bridge diode D15 is connected to the capacitor C4, the capacitor C4 is connected to the capacitor C6, and the capacitor C6 is connected to the fuse F2.

8. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 7, characterized in that: The explosion-proof energy-limiting module (700) comprises a diode TVS10, the diode TVS10 is connected to a resistor R11, the resistor R11 is respectively connected to a resistor R10 and a resistor R12, the resistor R10 is connected to an anode of a voltage-stabilizing diode ZD2 and an anode of a voltage-stabilizing diode ZD4, the cathode of the voltage-stabilizing diode ZD2 is connected to an anode of a voltage-stabilizing diode ZD1, the cathode of the voltage-stabilizing diode ZD4 is connected to an anode of a voltage-stabilizing diode ZD3, and the anode of the voltage-stabilizing diode ZD3 and the cathode of the voltage-stabilizing diode ZD1 are connected to the resistor R12.

9. The explosion-proof communication control circuit for energy storage battery factory as claimed in claim 8, characterized in that: The CAN transceiver module (800) comprises a diode D10, the cathode of the diode D10 is respectively connected to the cathode of the diode D12 and the diode TVS11, the diode TVS11 is respectively connected to the cathode of the diode D11 and the cathode of the diode D13, the anode of the diode D11 and the anode of the diode D13 are connected to the CAN transceiver U10, the CAN transceiver U10 is connected to a resistor R14, the resistor R14 is connected to a transistor O2, the transistor O2 is connected to a resistor R21 and the collector of a transistor T2, the emitter of the transistor T2 is grounded, the base of the transistor T2 is connected to a resistor R22, and the resistor R22 is connected to the MCU main control module (1000).

10. The explosion-proof communication control circuit for energy storage battery factory according to claim 9, characterized in that: The optical coupling isolation module (900) comprises a logic chip U12, the logic chip U12 is respectively connected to a capacitor C7, a capacitor C8 and a resistor R13, the resistor R13 is connected to a transistor O1, the transistor O1 is respectively connected to a resistor R20, and the resistor R20 is connected to an MCU main control module (1000).

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