A generator protection device

Abstract

This utility model relates to the field of electrical control and testing technology, specifically a generator protection device, including a housing, a circuit board, and a protection circuit. The protection circuit is disposed on the circuit board, and the housing includes an upper housing and a lower housing. The circuit board is disposed inside the lower housing, and the upper housing is engaged with the lower housing to form a cavity for accommodating the circuit board. The protection circuit includes an overvoltage and overcurrent protection circuit, a leakage current protection circuit, a DC voltage regulator circuit, an MCU circuit, and a serial communication circuit. The overvoltage and overcurrent protection circuit is connected to the leakage current protection circuit, the DC voltage regulator circuit, and the MCU circuit, respectively. The DC voltage regulator circuit is connected to the serial communication circuit and the MCU circuit, respectively. The MCU circuit is connected to the leakage current protection circuit and the serial communication circuit, respectively.

Description

Technical Field

[0001] This utility model relates to the field of electrical control and testing technology, specifically a generator protection device. Background Technology

[0002] In recent years, with the widespread application of coal mine inspection robots, the need for long-distance and steep-slope conveyor belt inspections has gradually increased. In this application environment, battery-powered coal mine inspection robots have obvious disadvantages such as insufficient battery cruising ability and limited climbing ability. As a result, a traction-type inspection robot was developed. It is not affected by the battery cruising ability and can operate in any environment with long distances and steep slopes. However, the traction-type inspection robot relies on the energy generated by generators to power the equipment, which also brings problems such as whether the power generation is constant and how to protect against high voltage and overcurrent phenomena generated during the power generation process. Therefore, a protection device is needed to limit or control the excessive energy generated by the generator. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a generator protection device that handles high voltage and overcurrent through overvoltage and overcurrent protection circuits and leakage protection circuits, while simultaneously monitoring the status of the entire circuit through an MCU circuit.

[0004] This utility model discloses a generator protection device, comprising a housing, a circuit board, and a protection circuit. The protection circuit is disposed on the circuit board. The housing includes an upper housing and a lower housing. The circuit board is disposed within the lower housing, and the upper housing is engaged with the lower housing to form a cavity for accommodating the circuit board. The protection circuit includes an overvoltage and overcurrent protection circuit, a leakage current protection circuit, a DC voltage regulator circuit, an MCU circuit, and a serial communication circuit. The overvoltage and overcurrent protection circuit is connected to the leakage current protection circuit, the DC voltage regulator circuit, and the MCU circuit, respectively. The DC voltage regulator circuit is connected to the serial communication circuit and the MCU circuit, respectively. The MCU circuit is connected to the leakage current protection circuit and the serial communication circuit, respectively.

[0005] Furthermore, the lower housing is provided with several openings, and the openings are provided with removable plugs.

[0006] Furthermore, the lower housing is provided with heat dissipation holes.

[0007] Furthermore, the overvoltage and overcurrent protection circuit includes diodes D1 and D2, gas discharge tubes GDT1 and GDT2, resistors R6, R7, and R4; the two ends of gas discharge tube GDT2 are respectively connected to the positive and negative terminals of the generator rectifier input power supply; diodes D1 and R6 are connected in parallel with gas discharge tube GDT2; one end of gas discharge tube GDT2 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of gas discharge tube GDT1, and the other end of gas discharge tube GDT1 is connected to the other end of gas discharge tube GDT2; diodes D2 and R7 are connected in parallel with gas discharge tube GDT1; resistor R7 is connected in parallel with a capacitor C2; one end of capacitor C2 is the negative terminal (GND), and the other end is the positive terminal (V).

[0008] Furthermore, the leakage protection circuit includes a comparator and operational amplifier U4, a power MOSFET U5, a diode D6, a diode D7, a resistor R17, a resistor R18, a resistor R19, and a terminal J6. Pin 1 of the comparator and operational amplifier U4 is connected to pin 5 of the comparator and operational amplifier U4 through resistor R19; pin 3 of the comparator and operational amplifier U4 is connected to the positive output V through resistors R17 and R18; pin 3 of the comparator and operational amplifier U4 is connected to the negative output GND through diode D6; pin 7 of the comparator and operational amplifier U4 is connected to pin 4 of the power MOSFET U5 through resistor R20. Pins 1, 2, and 3 of power MOSFET U5 are all connected to the negative output GND; pins 5, 6, 7, and 8 of power MOSFET U5 are all connected to pin 1 of terminal J6; pin 1 of terminal J6 is connected to the negative output GND through diode D7; pin 2 of terminal J6 is connected to the positive output V.

[0009] Furthermore, the DC voltage regulator circuit includes a DC voltage converter U8, a voltage regulator chip U9, a diode D10, capacitors C12, C16, C17, C19, C20, C21, C22, a resistor R29, and an inductor L1. Pin 3 of DC-DC converter U8 is connected to pin 4 of DC-DC converter U8 via capacitor C12; pin 4 of DC-DC converter U8 is connected to the positive terminal output V via diode D10; pin 4 of DC-DC converter U8 is connected to the negative terminal output GND via capacitor C17; pin 4 of DC-DC converter U8 is connected to the negative terminal output GND via capacitor C16; pins 6 and 7 of DC-DC converter U8 are connected to the negative terminal output GND; pin 5 of DC-DC converter U8 is connected to pin 2 of DC-DC converter U8 and resistor R29 via inductor L1; resistor R29 is connected to pin 1 of DC-DC converter U8; resistor R29 is also connected to pin 1 of voltage regulator chip U9. Pin 1 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C21; pin 1 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C19; pin 2 of voltage regulator chip U9 is connected to the negative terminal output GND; pin 3 of voltage regulator chip U9 is the power output; pin 3 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C22; pin 3 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C20.

[0010] Furthermore, the MCU circuit includes controller U6, resistor R21, and resistor R23; Pin 2 of controller U6 is connected to the leakage protection circuit through resistor R21; pin 8 of controller U6 is connected to the power output; pin 19 of controller U6 is connected to the leakage protection circuit through resistor R23; pins 11 and 12 of controller U6 are connected to the serial communication circuit respectively.

[0011] Furthermore, the serial communication circuit includes a serial port chip U1, a diode Q1, a capacitor C1, a resistor R1, and a resistor R3; Pin 4 of serial port chip U1 is connected to the power output, and capacitor C1 is connected between pins 3 and 4 of serial port chip U1; pins 1 and 2 of serial port chip U1 are connected to pins 11 and 12 of controller U6; pin 6 of serial port chip U1 is connected to pin 7 through diode Q1; pin 7 is connected to the external serial port through resistor R1; pin 6 is connected to the external serial port through resistor R3.

[0012] Furthermore, the overvoltage and overcurrent protection circuit also includes a resistor R40 and an indicator light D11; one end of the resistor R40 is connected to the positive output V, and the other end of the resistor R40 is connected to one end of the indicator light D11, and the other end of the indicator light D11 is connected to the negative output GND; diodes D1 and D2 are both TVS diodes.

[0013] The beneficial effects of this utility model are: The protection circuit of this invention is mounted on a circuit board, which is housed within the casing, providing excellent protection for the circuit. This invention also features a small size as its protective device.

[0014] The protection circuit of this utility model eliminates the effects of pulse voltage and current by limiting the current and clamping the voltage, and converts the residual energy generated by the generator into heat energy through discharge, so as to ensure the safety requirements of working in the explosive gas environment of coal mine. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is an electrical schematic diagram of the present invention; Figure 2 This is a schematic diagram of the overvoltage and overcurrent protection circuit of this utility model; Figure 3 This is a schematic diagram of the leakage protection circuit of this utility model; Figure 4 This is a schematic diagram of the DC voltage regulator circuit of this utility model; Figure 5 This is the schematic diagram of the MCU circuit of this utility model; Figure 6 This is a schematic diagram of the serial communication circuit of this utility model. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model are described clearly and completely below. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] The purpose of this invention is to provide a generator protection device that handles high voltage and overcurrent through overvoltage and overcurrent protection circuits and leakage protection circuits, while also incorporating an MCU circuit to monitor the status of the entire circuit.

[0019] This utility model discloses a generator protection device, comprising a housing, a circuit board, and a protection circuit. The circuit board is disposed within the housing, and the protection circuit is disposed on the circuit board. The housing includes an upper housing and a lower housing. The upper housing engages (fastens) with the lower housing to form a cavity for accommodating the circuit board. Specifically, the circuit board and the lower housing have screw holes. A nut passes through the screw hole in the circuit board and is threadedly connected to the screw hole in the lower housing, thereby allowing the circuit board to be disposed on the lower housing. The lower housing has heat dissipation holes. It should be noted that the lower housing has several openings, and the openings are fitted with removable plugs.

[0020] The protection circuit includes an overvoltage and overcurrent protection circuit, a leakage current protection circuit, a DC voltage regulator circuit, an MCU circuit, and a serial communication circuit. The overvoltage and overcurrent protection circuit is connected to the leakage current protection circuit, the DC voltage regulator circuit, the MCU circuit, and the load circuit, respectively. The DC voltage regulator circuit is connected to the serial communication circuit and the MCU circuit, respectively. The MCU circuit is connected to the leakage current protection circuit and the serial communication circuit, respectively. The input of the overvoltage and overcurrent protection circuit is the generator rectified input power supply. Figure 1 (The "generator rectifier input" in the text); the serial communication circuit connects to an external serial port, such as... Figure 1 As shown.

[0021] Specifically, the external generator rectified input power supply passes through an overvoltage and overcurrent protection circuit. After the overvoltage and overcurrent protection circuit outputs, part of the output is sent to the load circuit, part is sent to the MCU circuit and serial communication circuit through a DC voltage regulator circuit, and part is connected to a leakage protection circuit. The leakage protection circuit is connected to a leakage resistor. The MCU circuit detects the voltage and current values ​​after passing through the overvoltage and overcurrent protection circuit through an ADC, and at the same time outputs a signal to control the leakage protection circuit, so that the leakage protection circuit releases the remaining energy generated by the generator. The MCU circuit exchanges the collected signals and operating status with the external serial port through the serial communication circuit.

[0022] like Figure 2 As shown, the overvoltage and overcurrent protection circuit includes interface J2, interface J4, diodes D1 and D2, gas discharge tubes GDT1 and GDT2, resistors R6, R7, and R4. The positive terminal of the generator rectifier input power supply is connected to interface J2, and then connected to one end of gas discharge tube GDT2 via fuse F1. The other end of gas discharge tube GDT2 is connected to interface J4. The negative terminal of the generator rectifier input power supply is interface J4. Diode D1 and resistor R6 are connected in parallel with gas discharge tube GDT2. One end of gas discharge tube GDT2 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of gas discharge tube GDT1, and the other end of gas discharge tube GDT1 is connected to the other end of gas discharge tube GDT2. Diode D2 and resistor R7 are connected in parallel with gas discharge tube GDT1.

[0023] The overvoltage and overcurrent protection circuit is connected to a supercapacitor. A supercapacitor refers to... Figure 2 Capacitor C2 is connected in parallel with resistor R7. One end of capacitor C2 is the negative terminal, outputting GND. Figure 2 The other end is the positive output V (GND). Figure 2The overvoltage and overcurrent protection circuit also includes resistor R40 and indicator light D11; one end of resistor R40 is connected to the positive output V, and the other end of resistor R40 is connected to one end of indicator light D11, which in turn is connected to the negative output GND. In the overvoltage and overcurrent protection circuit, diodes D1 and D2 are both TVS diodes. Resistors R6 and R7 are varistors, and resistor R4 is a power resistor. Capacitor C2 is a filter capacitor. The overvoltage and overcurrent protection circuit is connected to the load circuit by inputting the positive output V and the negative output GND to the load circuit.

[0024] The positive terminal of the generator's rectified input power supply is connected to fuse F1 (which can blow quickly in one go), providing overcurrent protection. Then, a gas discharge tube GDT2, diode D1, and resistor R6 are connected in parallel. GDT2 suppresses the pulse current generated by the generator. Diode D1, acting as a TVS diode, effectively controls the high voltage of the electromotive force generated during power generation, preventing voltage spikes. Resistor R6, acting as a varistor, withstands overvoltage in the circuit, thus clamping the voltage and absorbing excess current for overvoltage protection. Resistor R4 can be connected in the circuit as a sampling resistor. Another set of GDT1, diode D2, and resistor R7 are connected in parallel. This series dual-path overvoltage and overcurrent protection circuit provides hardware protection.

[0025] like Figure 3 As shown, the leakage protection circuit includes a comparator and operational amplifier U4, a power MOSFET U5, diodes D6 and D7, resistors R17, R18, and R19, and terminal J6.

[0026] Pin 1 of the comparator / operational amplifier U4 is connected to pin 5 of the comparator / operational amplifier U4 via resistor R19; pin 3 of the comparator / operational amplifier U4 is connected to the positive terminal (V) via resistors R17 and R18; pin 3 of the comparator / operational amplifier U4 is connected to the negative terminal (GND) via diode D6; pin 7 of the comparator / operational amplifier U4 is connected to pin 4 of the power MOSFET U5 via resistor R20; pins 1, 2, and 3 of the power MOSFET U5 are all connected to the negative terminal (GND); pins 5, 6, 7, and 8 of the power MOSFET U5 are all connected to pin 1 of terminal J6; pin 1 of terminal J6 is connected to the negative terminal (GND) via diode D7; pin 2 of terminal J6 is connected to the positive terminal (V). Terminal J6 is connected to an external bleed resistor.

[0027] Among them, resistor R19 is a proportional amplifier resistor, diode D6 is a Zener diode, diode D7 is a TVS diode, and resistor R17 is a voltage divider resistor.

[0028] The leakage protection circuit compares the voltage value generated by the generator with that of the comparator and operational amplifier U4. Simultaneously, the acquired voltage value is input to the ADC detection circuit of the MCU circuit. When the voltage generated by the generator exceeds a set threshold, the comparator and operational amplifier U4 uses its internal comparator to determine if the acquired voltage exceeds the threshold voltage. If so, the output of the internal amplifier of the comparator and operational amplifier U4 triggers the gate (G) of the power MOSFET U5, causing it to conduct. The output of the power MOSFET U5 is connected to a leakage resistor, releasing the higher energy through the leakage resistor to achieve the protection function. If the comparator and operational amplifier U4 fails to detect the leakage, an analog voltage value can be sent to the MCU circuit. The MCU circuit then uses a voltage threshold to determine the voltage value and ultimately controls the power MOSFET U5 to conduct, thus releasing energy. The leakage protection circuit design incorporates both hardware and software detection and protection functions, satisfying the redundancy protection design requirements.

[0029] like Figure 4 As shown, the DC voltage regulator circuit includes a DC-DC converter U8, a voltage regulator chip U9, a diode D10, capacitors C12, C16, C17, C19, C20, C21, and C22, a resistor R29, and an inductor L1. Pin 3 of the DC-DC converter U8 is connected to pin 4 of the DC-DC converter U8 through capacitor C12. Pin 4 of the DC-DC converter U8 is connected to the positive terminal (V) through diode D10. Pin 4 of the DC-DC converter U8 is connected to the negative terminal (GND) through capacitor C17. Pin 4 of the DC-DC converter U8 is connected to the negative terminal (GND) through capacitor C16. Pins 6 and 7 of the DC-DC converter U8 are connected to the negative terminal (GND). Pin 5 of the DC-DC converter U8 is connected to pin 2 of the DC-DC converter U8 and resistor R29 through inductor L1. The output voltage at resistor R29 is 12V. A diode D13 is also connected in parallel on the output side of the DC-DC converter U8. Diode D13 is a Zener diode. Capacitor C17 is an energy storage capacitor, and capacitor C16 is a filter capacitor.

[0030] Pin 1 of voltage regulator chip U9 is connected to a 12V voltage. Pin 1 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C21; pin 1 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C19; pin 2 of voltage regulator chip U9 is connected to the negative terminal output GND; pin 3 of voltage regulator chip U9 is the power output; pin 3 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C22; pin 3 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C20. The power output here is 5V. A diode D14 is also connected in parallel on the output side of voltage regulator chip U9. Diode D14 is a Zener diode. After overvoltage and overcurrent protection, the output voltage and current (positive output V) are connected to diode D10 to prevent directional damage to the load chip. Then, through DC voltage converter U8, the voltage is converted to 12V output. At the same time, diode D13 (for voltage regulation) is connected in parallel on the output side to clamp the voltage. Then, through voltage regulator chip U9 (linear), the voltage output is converted to 5V (power output). At the same time, diode D14 (for voltage regulation) is connected in parallel on the output side to clamp the voltage as well. Finally, the output supplies power to the MCU circuit and serial communication circuit, ensuring the stability of the power supply.

[0031] like Figure 5 As shown, the MCU circuit includes controller U6, resistors R21 and R23. Pin 2 of controller U6 is connected to pin 1 of the comparator and operational amplifier U4 in the current leakage protection circuit via resistor R21. Pin 8 of controller U6 is connected to the power output (5V), and pin 19 of controller U6 is connected to pin 4 of the power MOSFET U5 in the current leakage protection circuit via resistor R23. Resistors R21 and R23 are both current-limiting resistors. Pins 11 and 12 of controller U6 are connected to pins 1 and 2 of the serial port chip U1 in the serial communication circuit, respectively.

[0032] The controller U6 monitors the generator rectifier input power supply. When high voltage or large current is generated during the power generation process, it outputs control to release energy through the leakage protection circuit. On the other hand, it exchanges data with the serial communication circuit through the serial port and finally transmits the collected and output control information to the control host to detect the status information of the entire generator protection circuit.

[0033] like Figure 6 As shown, the serial communication circuit includes a serial port chip U1, a diode Q1, a capacitor C1, and a resistor R1. Pin 4 of the serial port chip U1 is connected to the power output, and capacitor C1 is connected between pins 3 and 4 of the serial port chip U1. Pins 1 and 2 of the serial port chip U1 are connected to pins 11 and 12 of the controller U6. Pin 6 of the serial port chip U1 is connected to pin 7 through diode Q1. Preferably, diode Q1 is a dual-channel TVS diode, and the common terminal of diode Q1 is connected to DGND (digital ground). Pin 5 is connected to DGND. Pin 7 is connected to one pin of the external serial port through resistor R1. Pin 6 is connected to the other pin of the external serial port through resistor R3. Pins 6 and 7 are connected to the external serial port through resistors R3 and R1, respectively, to receive external serial port signals. The serial port chip U1 is an isolated type. Resistors R1 and R3 are current-limiting resistors, and capacitor C1 is a filter capacitor. The common terminal of diode Q1 is connected to DGND, and diode Q1 is connected in parallel with a resistor R2 (resistor R2 is the terminating resistor).

[0034] The serial communication circuit is powered by the voltage regulator chip U9. The serial port signal of the MCU circuit is connected to the communication interface of the serial port chip U1. The serial port chip U1 converts the signal into a 485 signal, and diode Q1 (dual TVS diode) is connected in parallel across the two ends. Then the 485 signal communicates with the external serial port through resistors R1 and R3 (for current limiting). The purpose of this is to prevent interference signals or interference voltage and current from damaging the chip momentarily. After protection, the output serial port signal exchanges information with the external host.

[0035] Since interfaces J2 and J4 in the protection circuit need to be connected to the generator rectifier input power supply, the plugs can be removed, and interfaces J2 and J4 can be positioned at the openings. Other connections requiring external access can also be made using the same method; this is existing technology and will not be described in detail further.

[0036] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A generator protection device, characterized in that, The device includes a housing, a circuit board, and a protection circuit. The protection circuit is mounted on the circuit board. The housing includes an upper housing and a lower housing. The circuit board is housed within the lower housing, and the upper housing is engaged with the lower housing to form a cavity for accommodating the circuit board. The protection circuit includes an overvoltage and overcurrent protection circuit, a leakage current protection circuit, a DC voltage regulator circuit, an MCU circuit, and a serial communication circuit. The overvoltage and overcurrent protection circuit is connected to the leakage current protection circuit, the DC voltage regulator circuit, and the MCU circuit, respectively. The DC voltage regulator circuit is connected to the serial communication circuit and the MCU circuit, respectively. The MCU circuit is connected to the leakage current protection circuit and the serial communication circuit, respectively.

2. The generator protection device according to claim 1, characterized in that, The lower housing has several openings, and each opening is fitted with a removable plug.

3. A generator protection device according to claim 2, characterized in that, The lower housing is provided with heat dissipation holes.

4. A generator protection device according to claim 1, characterized in that, The overvoltage and overcurrent protection circuit includes diode D1, diode D2, gas discharge tube GDT1, gas discharge tube GDT2, resistor R6, resistor R7, and resistor R4. The two ends of the gas discharge tube GDT2 are connected to the positive and negative terminals of the generator rectifier input power supply, respectively. Diode D1 and resistor R6 are connected in parallel with gas discharge tube GDT2. One end of gas discharge tube GDT2 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of gas discharge tube GDT1, and the other end of gas discharge tube GDT1 is connected to the other end of gas discharge tube GDT2. Diode D2 and resistor R7 are connected in parallel with gas discharge tube GDT1. Resistor R7 is connected in parallel with capacitor C2. One end of capacitor C2 is the negative terminal (GND), and the other end is the positive terminal (V).

5. A generator protection device according to claim 4, characterized in that, The leakage protection circuit includes a comparator and operational amplifier U4, a power MOSFET U5, a diode D6, a diode D7, a resistor R17, a resistor R18, a resistor R19, and a terminal J6. Pin 1 of the comparator and operational amplifier U4 is connected to pin 5 of the comparator and operational amplifier U4 through resistor R19; pin 3 of the comparator and operational amplifier U4 is connected to the positive output V through resistors R17 and R18; pin 3 of the comparator and operational amplifier U4 is connected to the negative output GND through diode D6; pin 7 of the comparator and operational amplifier U4 is connected to pin 4 of the power MOSFET U5 through resistor R20. Pins 1, 2, and 3 of power MOSFET U5 are all connected to the negative output GND; pins 5, 6, 7, and 8 of power MOSFET U5 are all connected to pin 1 of terminal J6; pin 1 of terminal J6 is connected to the negative output GND through diode D7; pin 2 of terminal J6 is connected to the positive output V.

6. A generator protection device according to claim 5, characterized in that, The DC voltage regulator circuit includes a DC voltage converter U8, a voltage regulator chip U9, a diode D10, capacitors C12, C16, C17, C19, C20, C21, C22, a resistor R29, and an inductor L1. Pin 3 of DC-DC converter U8 is connected to pin 4 of DC-DC converter U8 via capacitor C12; pin 4 of DC-DC converter U8 is connected to the positive terminal output V via diode D10; pin 4 of DC-DC converter U8 is connected to the negative terminal output GND via capacitor C17; pin 4 of DC-DC converter U8 is connected to the negative terminal output GND via capacitor C16; pins 6 and 7 of DC-DC converter U8 are connected to the negative terminal output GND; pin 5 of DC-DC converter U8 is connected to pin 2 of DC-DC converter U8 and resistor R29 via inductor L1; resistor R29 is connected to pin 1 of DC-DC converter U8; resistor R29 is also connected to pin 1 of voltage regulator chip U9. Pin 1 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C21; pin 1 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C19; pin 2 of voltage regulator chip U9 is connected to the negative terminal output GND; pin 3 of voltage regulator chip U9 is the power output; pin 3 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C22; pin 3 of voltage regulator chip U9 is connected to pin 2 of voltage regulator chip U9 through capacitor C20.

7. A generator protection device according to claim 6, characterized in that, The MCU circuit includes controller U6, resistor R21, and resistor R23; Pin 2 of controller U6 is connected to the leakage protection circuit through resistor R21; pin 8 of controller U6 is connected to the power output; pin 19 of controller U6 is connected to the leakage protection circuit through resistor R23; pins 11 and 12 of controller U6 are connected to the serial communication circuit respectively.

8. A generator protection device according to claim 7, characterized in that, The serial communication circuit includes a serial port chip U1, a diode Q1, a capacitor C1, a resistor R1, and a resistor R3; Pin 4 of serial port chip U1 is connected to the power output, and capacitor C1 is connected between pins 3 and 4 of serial port chip U1; pins 1 and 2 of serial port chip U1 are connected to pins 11 and 12 of controller U6; pin 6 of serial port chip U1 is connected to pin 7 through diode Q1; pin 7 is connected to the external serial port through resistor R1; pin 6 is connected to the external serial port through resistor R3.

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