DC system battery automatic start-up warning control system

Abstract

The present invention provides a DC system battery automatic input warning control system, comprising a controller, a first detection unit for detecting the action of a fuse of the DC system, a second detection unit for detecting the voltage of the battery, a third detection unit for detecting the voltage of a DC bus, a preprocessing unit, a power supply unit and an output control unit; the detection input end of the controller is connected to the output end of the first detection unit, the output ends of the second detection unit and the third detection unit are connected to the input end of the preprocessing unit, the output end of the preprocessing unit is connected to the controller, the control output end of the controller is connected to the control input end of the output control unit, the output control unit sends control signals to a user terminal and a battery input switch respectively, the power supply unit converts 220V AC power into 5V DC power and provides it to each electrical device; the DC system can accurately judge whether the battery is disconnected from the DC bus or the fuse of the DC system is blown when the DC system loses power.

Description

Technical Field

[0001] The invention relates to a protection system, in particular to a DC system battery automatic input warning control system. Background Art

[0002] In a substation, the battery is prohibited from being disconnected from the DC bus when the DC power supply system is running. Once the battery is disconnected from the DC bus, if an AC power failure occurs at this time, the substation will lose the protection of the DC system, which will cause serious consequences, such as burning a large number of primary equipment including the main transformer, causing power supply accidents and bringing serious economic losses.

[0003] Based on the above, how to ensure the reliable connection between the battery and the DC bus in the DC power supply system becomes a technical problem. The problem lies in how to judge whether the power failure of the DC system is caused by the battery being disconnected or the fuse of the DC system being blown due to overvoltage and overcurrent. If the fuse of the DC system is blown, there is no need to re-activate it. If the electronically controlled air switch between the battery and the DC bus is activated at this time, it will cause false operation and pose a safety hazard.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a DC system battery automatic start-up warning control system, which can accurately judge whether the battery is disconnected from the DC bus or the fuse of the DC system is blown when the DC system loses power, so as to perform timely re-start action when it is determined that the battery is disconnected from the DC bus, thereby ensuring the stability of the DC system and effectively avoiding the power supply safety hazards caused by the battery disconnection.

[0006] The present invention provides a DC system battery automatic input warning control system, comprising a controller, a first detection unit for detecting the action of a fuse of the DC system, a second detection unit for detecting the battery voltage, a third detection unit for detecting the DC bus voltage, a preprocessing unit, a power supply unit and an output control unit;

[0007] The detection input end of the controller is connected to the output end of the first detection unit, and the output ends of the second detection unit and the third detection unit are connected to the input end of the preprocessing unit. The preprocessing unit is used to convert the analog signals output by the second detection unit and the third detection unit into digital signals and transmit them to the controller. The controller will put the battery disconnected from the DC bus back into the DC bus according to the output signals of the first detection unit, the second detection unit and the third detection unit. The control output end of the controller is connected to the control input end of the output control unit. The output control unit sends control signals to the user terminal and the battery input switch respectively. The power supply unit converts 220V AC power into 5V DC power and provides it to each electrical device.

[0008] Furthermore, the preprocessing unit includes an analog-to-digital conversion circuit and a reference voltage circuit, the output end of the reference voltage circuit is connected to the reference signal input end of the analog-to-digital conversion circuit, the input end of the preprocessing unit is respectively connected to the output ends of the third detection unit and the second detection unit, and the analog-to-digital conversion circuit is communicatively connected to the controller.

[0009] Furthermore, the analog-to-digital conversion circuit is an AD7606BBSTZ chip, and the reference voltage circuit is a REF5025AIDR chip.

[0010] Further, the second detection unit includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a bidirectional transient suppression diode D1, a bidirectional transient suppression diode D2, a capacitor C5, and a capacitor C7;

[0011] One end of the resistor R11 is the input end of the second detection unit and is connected to the lithium battery. The other end of the resistor R11 is connected to one end of the resistor R13 through the resistor R12. The other end of the resistor R13 is connected to one end of the resistor R14. The other end of the resistor R14 is the output end of the second detection unit. The capacitor C5 and the bidirectional transient suppression diode D1 are connected in parallel with the resistor R12. The capacitor C7 and the bidirectional transient suppression diode D2 are connected in parallel with the resistor R13.

[0012] Further, the third detection unit includes a resistor R15, a resistor R16, a resistor R17, a resistor R18, a bidirectional transient suppression diode D3, a bidirectional transient suppression diode D4, a capacitor C9, and a capacitor C8;

[0013] One end of the resistor R15 is the input end of the third detection unit connected to the positive electrode of the DC bus, the other end of the resistor R15 is connected to one end of the resistor R17 through the resistor R16, the other end of the resistor R17 is connected to one end of the resistor R18, the other end of the resistor R18 is the output end of the third detection unit, the capacitor C9 and the bidirectional transient suppression diode D3 are connected in parallel with the resistor R16, and the capacitor C8 and the bidirectional transient suppression diode D4 are connected in parallel with the resistor R17.

[0014] Further, the first detection unit includes two detection circuits and an isolation circuit with the same structure;

[0015] The input end of the isolation circuit is connected to the output end of the power supply unit, the output end of the isolation circuit is connected to the first power supply end of the detection circuit, and the second power supply end of the detection circuit is connected to the 3.3V power supply;

[0016] The detection circuit includes an optical coupler OC1, a resistor R8 and a resistor R7;

[0017] The light emitting diode of the optical coupler OC1 is connected to one end of the resistor R7, the other end of the resistor R7 is the first power supply end of the detection circuit, the cathode of the light emitting diode of the optical coupler OC1 is the detection input end of the detection circuit, the emitter of the phototransistor of the optical coupler OC1 is grounded, the collector of the phototransistor of the optical coupler OC1 is connected to one end of the resistor R8, the other end of the resistor R8 is the second power supply end of the detection circuit, and the collector of the phototransistor of the optical coupler OC1 is connected to the detection input end of the controller as the output end of the detection circuit;

[0018] The detection input terminals of the two detection circuits are respectively connected to the positive auxiliary contact and the negative auxiliary contact of the fuse of the DC system.

[0019] Further, the output control unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a transistor Q1, a transistor Q2, a transistor Q3, a relay J1, a relay J2, a relay J3, a voltage regulator DZ1, a voltage regulator DZ2 and a voltage regulator DZ3;

[0020] One end of the resistor R1 is connected to the output end of the power supply unit, the other end of the resistor R1 is grounded through the capacitor C1, the common connection point of the capacitor C1 and the resistor R1 is connected to the collector of the transistor Q1 through the coil of the relay J1, the common connection point of the resistor R1 and the capacitor C1 is connected to the negative electrode of the voltage regulator DZ1, the positive electrode of the voltage regulator DZ1 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the control output end of the controller through the resistor R4, and the switch of the relay J1 is connected to the detection input end of the user terminal;

[0021] One end of the resistor R2 is connected to the output end of the power supply unit, the other end of the resistor R2 is grounded through the capacitor C2, the common connection point of the capacitor C2 and the resistor R2 is connected to the collector of the transistor Q2 through the coil of the relay J2, the common connection point of the resistor R2 and the capacitor C2 is connected to the negative electrode of the voltage regulator tube DZ2, the positive electrode of the voltage regulator tube DZ2 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected to the control output end of the controller through the resistor R5, and the switch of the relay J2 is connected to the electronically controlled air switch of the battery;

[0022] One end of the resistor R3 is connected to the output end of the power supply unit, the other end of the resistor R3 is grounded through the capacitor C3, the common connection point of the capacitor C3 and the resistor R3 is connected to the collector of the transistor Q3 through the coil of the relay J3, the common connection point of the resistor R3 and the capacitor C3 is connected to the negative electrode of the voltage regulator DZ3, the positive electrode of the voltage regulator DZ3 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to the control output end of the controller through the resistor R6, and the switch of the relay J3 is connected to the detection input end of the user terminal.

[0023] Furthermore, the controller is a STM32F407VET6 chip.

[0024] Furthermore, the power supply unit is a LDE05-20B05 module.

[0025] Furthermore, the isolation circuit is a B0505 ​​chip.

[0026] The beneficial effects of the present invention are as follows: Through the present invention, it is possible to accurately judge whether the DC system loses power due to the battery being disconnected from the DC bus or the fuse of the DC system being blown, so that when it is determined that the battery is disconnected from the DC bus, timely re-activation can be performed, thereby ensuring the stability of the DC system and effectively avoiding the power supply safety hazards caused by the battery being disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the structure of the output control unit of the present invention.

[0030] Figure 3 It is the principle diagram of the detection circuit of the present invention.

[0031] Figure 4 This is a schematic diagram of the second detection unit of the present invention.

[0032] Figure 5 This is a schematic diagram of the third detection unit of the present invention.

[0033] Figure 6 It is the principle diagram of the isolation circuit of the present invention.

[0034] Figure 7 This is the schematic diagram of the controller of this invention.

[0035] Figure 8 It is the principle diagram of the analog-to-digital conversion circuit of the present invention.

[0036] Fig. 9 This is the schematic diagram of the reference circuit of this invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0038] The present invention provides a DC system battery automatic input warning control system, comprising a controller, a first detection unit for detecting the action of a fuse of the DC system, a second detection unit for detecting the battery voltage, a third detection unit for detecting the DC bus voltage, a preprocessing unit, a power supply unit and an output control unit;

[0039] The detection input end of the controller is connected to the output end of the first detection unit, and the output ends of the second detection unit and the third detection unit are connected to the input end of the preprocessing unit. The preprocessing unit is used to convert the analog signals output by the second detection unit and the third detection unit into digital signals and transmit them to the controller. The controller reconnects the battery disconnected from the DC bus to the DC bus according to the output signals of the first detection unit, the second detection unit and the third detection unit. The control output end of the controller is connected to the control input end of the output control unit. The output control unit sends control signals to the user terminal and the battery input switch respectively. The power supply unit converts 220V AC into 5V DC and provides it to each electrical device. , the controller is an STM32F407VET6 chip; the power supply unit is an LDE05-20B05 module. In order to power the first detection unit, a 3.3V power supply is provided for converting the 5V DC output by the power supply unit into 3.3V DC. The SPX-1117M3 chip is adopted. Of course, the controller and the analog-to-digital conversion circuit also have a 3.3V power supply terminal. Through the above structure, it is possible to accurately judge whether the DC system loses power due to the battery being disconnected from the DC bus or the fuse of the DC system being blown, so that when it is determined that the battery is disconnected from the DC bus, the operation of re-entry is performed in time, thereby ensuring the stability of the DC system and effectively avoiding the hidden danger of power supply safety caused by the battery being disconnected.

[0040] In this embodiment, the preprocessing unit includes an analog-to-digital conversion circuit and a reference voltage circuit. The output end of the reference voltage circuit is connected to the reference signal input end of the analog-to-digital conversion circuit. The input end of the preprocessing unit is respectively connected to the output ends of the third detection unit and the second detection unit. The analog-to-digital conversion circuit is communicatively connected to the controller.

[0041] Among them, the analog-to-digital conversion circuit is an AD7606BBSTZ chip, and the reference voltage circuit is a REF5025AIDR chip. Through the above structure, the analog voltage signals output by the second detection unit and the third detection unit can be converted into digital voltage signals, which is beneficial to the recognition and control of the controller. Among them, the output end of the second detection unit is connected to the 6th pin of the analog-to-digital conversion circuit, the output end of the third detection unit is connected to the 7th pin of the analog-to-digital conversion circuit, and the 42nd pin of the analog-to-digital conversion circuit is connected to the output end of the reference circuit as the input end of the reference voltage signal. The connection relationship between the analog-to-digital conversion circuit and the controller is shown in the pin description in the accompanying drawing. In the accompanying drawing, the pins of the controller are not drawn completely due to the large number of pins, and only part of them are given. This part reflects the connection relationship between the controller and the analog-to-digital conversion circuit, and the controller and the output control circuit. Of course, a display is also provided for displaying the monitoring status. The display is communicatively connected to the controller. A memory connected to the controller is also provided, which adopts the HT24LC256 memory and is communicatively connected to the controller.

[0042] In this embodiment, the second detection unit includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a bidirectional transient suppression diode D1, a bidirectional transient suppression diode D2, a capacitor C5, and a capacitor C7;

[0043] One end of the resistor R11 is the input end of the second detection unit and is connected to the lithium battery. The other end of the resistor R11 is connected to one end of the resistor R13 through the resistor R12. The other end of the resistor R13 is connected to one end of the resistor R14. The other end of the resistor R14 is the output end of the second detection unit. The capacitor C5 and the bidirectional transient suppression diode D1 are connected in parallel with the resistor R12. The capacitor C7 and the bidirectional transient suppression diode D2 are connected in parallel with the resistor R13.

[0044] The third detection unit includes a resistor R15, a resistor R16, a resistor R17, a resistor R18, a bidirectional transient suppression diode D3, a bidirectional transient suppression diode D4, a capacitor C9, and a capacitor C8;

[0045] One end of the resistor R15 is the input end of the third detection unit connected to the positive electrode of the DC bus, the other end of the resistor R15 is connected to one end of the resistor R17 through the resistor R16, the other end of the resistor R17 is connected to one end of the resistor R18, the other end of the resistor R18 is the output end of the third detection unit, the capacitor C9 and the bidirectional transient suppression diode D3 are connected in parallel with the resistor R16, the capacitor C8 and the bidirectional transient suppression diode D4 are connected in parallel with the resistor R17, through the above structure, the voltage of the DC bus and the voltage of the battery can be accurately detected, so as to facilitate the controller to make control processing.

[0046] In this embodiment, the first detection unit includes two detection circuits and an isolation circuit with the same structure;

[0047] The input end of the isolation circuit is connected to the output end of the power supply unit, the output end of the isolation circuit is connected to the first power supply end of the detection circuit, and the second power supply end of the detection circuit is connected to the 3.3V power supply;

[0048] The detection circuit includes an optical coupler OC1, a resistor R8 and a resistor R7;

[0049] The light emitting diode of the optical coupler OC1 is connected to one end of the resistor R7, the other end of the resistor R7 is the first power supply end of the detection circuit, the cathode of the light emitting diode of the optical coupler OC1 is the detection input end of the detection circuit, the emitter of the phototransistor of the optical coupler OC1 is grounded, the collector of the phototransistor of the optical coupler OC1 is connected to one end of the resistor R8, the other end of the resistor R8 is the second power supply end of the detection circuit, and the collector of the phototransistor of the optical coupler OC1 is connected to the detection input end of the controller as the output end of the detection circuit;

[0050] The detection input terminals of the two detection circuits are respectively connected to the positive auxiliary contact and negative auxiliary contact of the fuse of the DC system. Figure 3 Two detection circuits are given in the figure. The structures of the two detection circuits are the same, but the component marking serial numbers are different. Since the detection circuit outputs high and low levels and is directly connected to the controller, if the power module is directly connected to the power terminal of the detection circuit, it is easy to damage the controller. Good isolation is achieved through the isolation circuit, thereby playing a good protective role. The isolation circuit is a B0505 ​​chip; the output ends of the two detection circuits are respectively connected to pins 33 and 34 of the controller.

[0051] In this embodiment, the output control unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a transistor Q1, a transistor Q2, a transistor Q3, a relay J1, a relay J2, a relay J3, a voltage regulator DZ1, a voltage regulator DZ2 and a voltage regulator DZ3;

[0052] One end of the resistor R1 is connected to the output end of the power supply unit, the other end of the resistor R1 is grounded through the capacitor C1, the common connection point of the capacitor C1 and the resistor R1 is connected to the collector of the transistor Q1 through the coil of the relay J1, the common connection point of the resistor R1 and the capacitor C1 is connected to the negative electrode of the voltage regulator DZ1, the positive electrode of the voltage regulator DZ1 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the control output end of the controller through the resistor R4, and the switch of the relay J1 is connected to the detection input end of the user terminal;

[0053] One end of the resistor R2 is connected to the output end of the power supply unit, the other end of the resistor R2 is grounded through the capacitor C2, the common connection point of the capacitor C2 and the resistor R2 is connected to the collector of the transistor Q2 through the coil of the relay J2, the common connection point of the resistor R2 and the capacitor C2 is connected to the negative electrode of the voltage regulator tube DZ2, the positive electrode of the voltage regulator tube DZ2 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected to the control output end of the controller through the resistor R5, and the switch of the relay J2 is connected to the electronically controlled air switch of the battery;

[0054] One end of the resistor R3 is connected to the output end of the power supply unit, the other end of the resistor R3 is grounded through the capacitor C3, the common connection point of the capacitor C3 and the resistor R3 is connected to the collector of the transistor Q3 through the coil of the relay J3, the common connection point of the resistor R3 and the capacitor C3 is connected to the negative electrode of the voltage regulator DZ3, the positive electrode of the voltage regulator DZ3 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to the control output end of the controller through the resistor R6, and the switch of the relay J3 is connected to the detection input end of the user terminal;

[0055] Among them, the existing electronically controlled air switch that controls the electrical connection relationship between the battery and the DC bus is controlled by the closure of the relay switch. The battery is put into the DC system. After the normally open switches of relay J1 and relay J3 are closed, they are used to lower the point of the detection circuit of the user terminal, thereby sending an alarm message to the user terminal. The closure of relay J1 indicates a battery disconnection alarm, and relay J3 indicates a DC bus power failure alarm. Transistor Q1 is connected to pin 47 of the controller through resistor R4, transistor Q2 is connected to pin 48 of the controller through resistor R5, and transistor Q3 is connected to pin 54 of the controller through resistor R6.

[0056] The specific method for the controller to determine whether the battery is disconnected from the DC system is as follows:

[0057] The cathodes of the light-emitting diodes of the optocoupler OC1 and the optocoupler OC2 are respectively connected to the auxiliary contacts of the DC fuse, wherein the auxiliary contacts of the DC fuse are the detection points of the DC fuse, and are used to determine whether the DC fuse has a fusing action. If it is fusing, the positive auxiliary contact and the negative auxiliary contact of the DC fuse both output a low level. If the DC fuse is normal, the positive auxiliary contact and the negative auxiliary contact output a high level.

[0058] When the cathodes of the light emitting diodes of the two optocouplers are both at a low level, the optocouplers are turned on, so that the pins connecting the controller and the optocouplers are changed from a high level to a low level.

[0059] The second detection unit and the third detection unit detect the voltage of the battery and the DC bus respectively. When the difference between the two voltages is less than the set value, it indicates that the connection of the battery is normal and the controller does not output the control command.

[0060] When the difference between the two voltages is greater than the set value, it is determined whether the current DC fuse is actuated. If it is actuated, it is determined that the current battery is out of the DC system. The controller outputs a control command to the output control unit, so that the output control unit executes the command, including alerting the user terminal and controlling the electronically controlled air switch to close again. The user terminal is composed of an existing single-chip microcomputer, a display, and an alarm.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A DC system battery automatic input warning control system, characterized by: It includes a controller, a first detection unit for detecting the action of a fuse of a DC system, a second detection unit for detecting the voltage of a battery, a third detection unit for detecting the voltage of a DC bus, a preprocessing unit, a power supply unit and an output control unit; The detection input end of the controller is connected to the output end of the first detection unit, and the output ends of the second detection unit and the third detection unit are connected to the input end of the preprocessing unit. The preprocessing unit is used to convert the analog signals output by the second detection unit and the third detection unit into digital signals and transmit them to the controller. The controller will put the battery disconnected from the DC bus back into the DC bus according to the output signals of the first detection unit, the second detection unit and the third detection unit. The control output end of the controller is connected to the control input end of the output control unit. The output control unit sends control signals to the user terminal and the battery input switch respectively. The power supply unit converts 220V AC power into 5V DC power and provides it to each electrical device.

2. According to claim 1, the DC system battery automatic start-up warning control system is characterized by: The preprocessing unit includes an analog-to-digital conversion circuit and a reference voltage circuit, the output end of the reference voltage circuit is connected to the reference signal input end of the analog-to-digital conversion circuit, the input end of the preprocessing unit is respectively connected to the output ends of the third detection unit and the second detection unit, and the analog-to-digital conversion circuit is communicatively connected to the controller.

3. The DC system battery automatic start-up warning control system according to claim 2 is characterized by: The analog-to-digital conversion circuit is an AD7606BBSTZ chip, and the reference voltage circuit is a REF5025AIDR chip.

4. The DC system battery automatic start-up warning control system according to claim 2 is characterized by: The second detection unit includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a bidirectional transient suppression diode D1, a bidirectional transient suppression diode D2, a capacitor C5, and a capacitor C7; One end of the resistor R11 is the input end of the second detection unit and is connected to the lithium battery. The other end of the resistor R11 is connected to one end of the resistor R13 through the resistor R12. The other end of the resistor R13 is connected to one end of the resistor R14. The other end of the resistor R14 is the output end of the second detection unit. The capacitor C5 and the bidirectional transient suppression diode D1 are connected in parallel with the resistor R12. The capacitor C7 and the bidirectional transient suppression diode D2 are connected in parallel with the resistor R13.

5. According to claim 2, the DC system battery automatic start-up warning control system is characterized by: The third detection unit includes a resistor R15, a resistor R16, a resistor R17, a resistor R18, a bidirectional transient suppression diode D3, a bidirectional transient suppression diode D4, a capacitor C9, and a capacitor C8; One end of the resistor R15 is the input end of the third detection unit connected to the positive electrode of the DC bus, the other end of the resistor R15 is connected to one end of the resistor R17 through the resistor R16, the other end of the resistor R17 is connected to one end of the resistor R18, the other end of the resistor R18 is the output end of the third detection unit, the capacitor C9 and the bidirectional transient suppression diode D3 are connected in parallel with the resistor R16, and the capacitor C8 and the bidirectional transient suppression diode D4 are connected in parallel with the resistor R17.

6. The DC system battery automatic start-up warning control system according to claim 1 is characterized by: The first detection unit includes two detection circuits and an isolation circuit with the same structure; The input end of the isolation circuit is connected to the output end of the power supply unit, the output end of the isolation circuit is connected to the first power supply end of the detection circuit, and the second power supply end of the detection circuit is connected to the 3.3V power supply; The detection circuit includes an optical coupler OC1, a resistor R8 and a resistor R7; The light emitting diode of the optical coupler OC1 is connected to one end of the resistor R7, the other end of the resistor R7 is the first power supply end of the detection circuit, the cathode of the light emitting diode of the optical coupler OC1 is the detection input end of the detection circuit, the emitter of the phototransistor of the optical coupler OC1 is grounded, the collector of the phototransistor of the optical coupler OC1 is connected to one end of the resistor R8, the other end of the resistor R8 is the second power supply end of the detection circuit, and the collector of the phototransistor of the optical coupler OC1 is connected to the detection input end of the controller as the output end of the detection circuit; The detection input terminals of the two detection circuits are respectively connected to the positive auxiliary contact and the negative auxiliary contact of the fuse of the DC system.

7. The DC system battery automatic start-up warning control system according to claim 1 is characterized by: The output control unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a transistor Q1, a transistor Q2, a transistor Q3, a relay J1, a relay J2, a relay J3, a voltage regulator DZ1, a voltage regulator DZ2 and a voltage regulator DZ3; One end of the resistor R1 is connected to the output end of the power supply unit, the other end of the resistor R1 is grounded through the capacitor C1, the common connection point of the capacitor C1 and the resistor R1 is connected to the collector of the transistor Q1 through the coil of the relay J1, the common connection point of the resistor R1 and the capacitor C1 is connected to the negative electrode of the voltage regulator DZ1, the positive electrode of the voltage regulator DZ1 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the control output end of the controller through the resistor R4, and the switch of the relay J1 is connected to the detection input end of the user terminal; One end of the resistor R2 is connected to the output end of the power supply unit, the other end of the resistor R2 is grounded through the capacitor C2, the common connection point of the capacitor C2 and the resistor R2 is connected to the collector of the transistor Q2 through the coil of the relay J2, the common connection point of the resistor R2 and the capacitor C2 is connected to the negative electrode of the voltage regulator tube DZ2, the positive electrode of the voltage regulator tube DZ2 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected to the control output end of the controller through the resistor R5, and the switch of the relay J2 is connected to the electronically controlled air switch of the battery; One end of the resistor R3 is connected to the output end of the power supply unit, the other end of the resistor R3 is grounded through the capacitor C3, the common connection point of the capacitor C3 and the resistor R3 is connected to the collector of the transistor Q3 through the coil of the relay J3, the common connection point of the resistor R3 and the capacitor C3 is connected to the negative electrode of the voltage regulator DZ3, the positive electrode of the voltage regulator DZ3 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to the control output end of the controller through the resistor R6, and the switch of the relay J3 is connected to the detection input end of the user terminal.

8. The DC system battery automatic start-up warning control system according to claim 1 is characterized by: The controller is a STM32F407VET6 chip.

9. The DC system battery automatic start-up warning control system according to claim 1 is characterized by: The power supply unit is a LDE05-20B05 module.

10. The DC system battery automatic start-up warning control system according to claim 6 is characterized by: The isolation circuit is a B0505 ​​chip.

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