A safety monitoring and early warning circuit device for electric power equipment

Abstract

The present invention provides a safety monitoring and early warning circuit device for power equipment to monitor and report the grounding safety of the equipment in real time, which not only has higher monitoring accuracy and improves the safety of use, but also has a wider test range and reduces the cost of use. It includes a mainboard detection circuit, characterized in that it also includes a sub-board detection circuit connected to the mainboard detection circuit, and the sub-board detection circuit can include at most three circuits, the mainboard detection circuit includes a main control module, the main module is respectively connected to a wireless communication module, a 4-way grounding resistance detection module, a first display module, a temperature and humidity detection module, and a sub-board communication module; the sub-board detection circuit includes a sub-board control module, the sub-board control module is respectively connected to an 8-way time-sharing detection module, a second display module, a mainboard communication module, and an inter-sub-board communication module; it also includes a power supply module, and the power supply module converts a 12VDC power supply into a 5V and 3.3V voltage source for internal power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment safety equipment, and in particular to a safety monitoring and early warning circuit device for power equipment. Background Art

[0002] As the automation level of manufacturing plants increases, the number of electrical equipment used is also increasing, and the requirements for electricity safety are becoming more stringent. There are two problems with the current equipment early warning devices: First, if the grounding resistance of the monitored equipment is too large, when a single-phase short circuit occurs, the short-circuit current is too small to reach the threshold of the equipment early warning device, and the early warning device will not work, which will cause the equipment casing to be charged for a long time. If a person touches such a charged device, there will be a risk of electric shock, and it will also affect the service life of the equipment; second, since the existing equipment early warning device has few test points, the test range is limited, so multiple devices need to be deployed, which increases the cost of use. Summary of the invention

[0003] In view of the problem that the existing equipment early warning devices have low monitoring accuracy and limited testing range, resulting in low safety and increased use costs, the present invention provides a safety monitoring and early warning circuit device for power equipment to monitor and report the grounding safety of equipment in real time. It not only has higher monitoring accuracy and improved safety of use, but also has a wider testing range and reduced use costs.

[0004] The technical solution is as follows: a safety monitoring and early warning circuit device for electric power equipment, which includes a mainboard detection circuit, characterized in that: it also includes a sub-board detection circuit connected to the mainboard detection circuit, and the sub-board detection circuit can include at most three circuits, the mainboard detection circuit includes a main control module, the main module is respectively connected to a wireless communication module, a 4-way grounding resistance detection module, a first display module, a temperature and humidity detection module, and a sub-board communication module; the sub-board detection circuit includes a sub-board control module, the sub-board control module is respectively connected to an 8-way time-sharing detection module, a second display module, a mainboard communication module, and an inter-sub-board communication module; it also includes a power supply module, the power supply module converts a 12VDC power supply into 5V and 3.3V voltage sources for internal power supply.

[0005] It is further characterized in that: the main control module includes a single-chip microcomputer U1, the wireless communication module includes an E22-400T30S wireless radio frequency chip U5, pins 1 to 3, 23, and 24 of the single-chip microcomputer U1 are connected to the main display module, pins 4, 11, 14, and 15 of the single-chip microcomputer U1 are connected to one end of capacitors C18 to C22 and a 3.3V voltage source, pins 5, 6, 10, 12, and 13 of the single-chip microcomputer U1 are respectively connected to pins 3, 4, 5, 1, and 2 of the E22-400T30S wireless radio frequency chip U5, and pin 6 of the E22-400T30S wireless radio frequency chip U5 is connected to the positive electrode of the capacitor E4, One end of capacitor C16 and a 5V voltage source, pin 7 of the E22-400T30S wireless RF chip U5 is connected to the negative electrode of the polar capacitor E4, the other end of capacitor C16, and one end of capacitor C17, the other end of capacitor C17 is connected to pin 9 of the single-chip microcomputer U1, the positive electrode of diode D2, and one end of resistor R20, the negative electrode of diode D2 is connected to the other end of resistor R20 and connected to a 3.3V voltage source, pins 15, 16, and 17 of the E22-400T30S wireless RF chip U5 are connected and grounded; pins 7 and 8 of the single-chip microcomputer U1 are respectively connected to the interactive communication module with the PC, and pins 16 to Pins 19 and 31 are respectively connected to the 4-way grounding resistance detection module, pins 20 and 28 of the single-chip microcomputer U1 are connected and then connected to one end of capacitor C24, one end of capacitor C25 and a 3.3V voltage source, pin 21 of the single-chip microcomputer U1 is connected to one end of capacitor C23, the other end of capacitor C18 to capacitor C25 is connected and then grounded, pin 22 of the single-chip microcomputer U1 is connected to one end of resistor R18, the other end of resistor R18 is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to one end of resistor R19 and one end of buzzer BZ1, the other end of resistor R19 and the other end of buzzer BZ1 are connected and then Connect a 12V voltage source, the 25 and 26 pins of the single-chip microcomputer U1 are respectively connected to the 2 and 3 pins of the interface J4, the 27 pin of the single-chip microcomputer U1 is connected to one end of the capacitor C3 and one end of the resistor R17, the other end of the resistor R17 is connected to one end of the resistor R13 and one end of the switch K1, the other end of the resistor R13 is connected to the 1 pin of the interface J4, one end of the capacitor C6 and a 3.3V voltage source, the other end of the capacitor C3, the other end of the switch K1, the other end of the capacitor C6, and the 4 pin of the interface J4 are connected and then grounded, the 29 and 30 pins of the single-chip microcomputer U1 are connected to the communication module with the daughter board, and the 32 pin of the single-chip microcomputer U1 is connected to the temperature and humidity detection module;

[0006] The 4-way grounding resistance detection module includes a terminal J2, wherein the 1st pin of the terminal J2 is connected to one end of the resistor R1, one end of the capacitor C39, the lower pin of the clamping diode D4, and one end of the resistor R40, the 2nd pin of the terminal J2 is connected to one end of the resistor R2, one end of the capacitor C40, the lower pin of the clamping diode D7, and one end of the resistor R41, the 3rd pin of the terminal J2 is connected to one end of the resistor R3, one end of the capacitor C41, the lower pin of the clamping diode D8, and one end of the resistor R42, the 4th pin of the terminal J2 is connected to one end of the resistor R4, one end of the capacitor C42, the lower pin of the clamping diode D9, and one end of the resistor R43, the other ends of the resistors R1 to R4 are connected to the cathode of the diode D1, the lower pin of the clamping diode D3, and one end of the resistor R39, and one of the upper ends of the clamping diodes D3, D4, D7, D8, and D9 is connected. The pins are connected to ground after being connected, the other pins of the upper ends of the clamping diodes D3, D4, D7, D8, and D9 are connected to the positive electrode of the diode D1 and the 3.3V voltage source after being connected, the other ends of the capacitors C39 to C42 are connected to the 5th pin of the interface terminal J2 and one end of the resistor R5, the other end of the resistor R5 is grounded, the other end of the resistor R39 is connected to one end of the capacitor C43 and the 31st pin of the single-chip microcomputer U1, the other end of the resistor R40 is connected to one end of the capacitor C44 and the 16th pin of the single-chip microcomputer U1, the other end of the resistor R41 is connected to one end of the capacitor C45 and the 17th pin of the single-chip microcomputer U1, the other end of the resistor R42 is connected to one end of the capacitor C46 and the 18th pin of the single-chip microcomputer U1, the other end of the resistor R43 is connected to one end of the capacitor C47 and the 19th pin of the single-chip microcomputer U1, and the other ends of the capacitors C43 to C47 are connected to ground after being connected;

[0007] The mainboard detection circuit also includes a first interactive communication module with a PC, and the sub-board detection circuit also includes a second interactive communication module with a PC. The first interactive communication module with a PC has the same circuit structure as the second interactive communication module with a PC. The first interactive communication module with a PC includes a USB-to-serial port chip U4. Pins 4 and 5 of the USB-to-serial port chip U4 are respectively connected to one end of a resistor R23 and one end of a resistor R22. Pin 6 of the USB-to-serial port chip U4 is connected to one end of a resistor R24, one end of a capacitor C28, and one end of a capacitor C29. Pins 7 and 8 of the USB-to-serial port chip U4 are connected to one end of an inductor FB1, one end of a capacitor C26, and one end of a capacitor C27. The other end of the resistor R23 is connected to pin 3 of the interface J5, pin 4 of the anti-static ESD diode U6, and one end of a resistor R36. The other end of the resistor R22 is connected to the interface J5 The 2nd pin of the interface J5, the 2nd pin of the anti-static ESD diode U6, and one end of the resistor R35, the other end of the inductor FB1 is connected to the 1st pin of the interface J5, the 1st pin of the anti-static ESD diode U6, the 6th pin of the interface J5 is connected to one end of the capacitor C5, one end of the resistor R21 and grounded, the 4th and 5th pins of the interface J5 are connected and connected to the other end of the capacitor C5, the other end of the resistor R21, the 3rd pin of the anti-static ESD diode U6, the other end of the capacitors C26 to C29, and the U The 3rd and 12th pins of the SB to serial port chip U4 are connected and then grounded, the other end of the resistor R36 is connected to one end of the resistor R37, the 18th pin of the USB to serial port chip U4, one end of the resistor R26, and the 8th pin of the single-chip computer U1, the other end of the resistor R37 is grounded, the other end of the resistor R35 is connected to the 17th pin of the USB to serial port chip U4, one end of the resistor R25, and the 7th pin of the single-chip computer U1, the other end of the resistor R25 and the other end of the resistor R26 are connected and then connected to a 3.3V voltage source;

[0008] The circuit structure of the first display module is the same as that of the second display module. The first display module includes a display screen OLED1. Pins 1, 8, 11, 12, 16, 17, 21 to 25, 29, and 30 of the display screen OLED1 are connected to one end of a capacitor C7, one end of a capacitor C11, one end of a capacitor C10, one end of a resistor R16, one end of a capacitor C12, and one end of a capacitor C13 and are grounded. Pins 2 and 3 of the display screen OLED1 are respectively connected to both ends of a capacitor C8. Pins 4 and 5 of the display screen OLED1 are respectively connected to both ends of a capacitor C4. Pins 6 and 9 of the display screen OLED1 are connected to the other end of the capacitor C7, the other end of the capacitor C11, and the other end of the capacitor C13. One end, the other end of capacitor C10, one end of resistor R14, one end of resistor R11 and a 3.3V voltage source, the 13th, 14th and 15th pins of the display screen OLED1 are respectively connected to the 23rd, 24th and 2nd pins of the single-chip computer U1, the 18th pin of the display screen OLED1 is connected to the other end of the resistor R14 and the 3rd pin of the single-chip computer U1, the 19th pin of the display screen OLED1 is connected to the other end of the resistor R11 and the 1st pin of the single-chip computer U1, the other end of the resistor R16 is connected to the 26th pin of the display screen OLED1, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively connected to the 27th and 28th pins of the display screen OLED1;

[0009] The temperature and humidity detection module includes a connection terminal J3, through which an external temperature and humidity sensor is connected, pin 1 of the connection terminal J3 is connected to one end of a resistor R7, one end of a resistor R6, and one end of a capacitor C15, pin 2 of the connection terminal J3 is connected to one end of a resistor R8, the drain of a MOS tube FET1, and one end of a resistor R10, the other end of the resistor R7 is connected to a 3.3V voltage source, the other end of the resistor R6 and the other end of the resistor R8 are connected and then connected to a 5V voltage source, the gate of the MOS tube FET1 is connected to one end of a resistor R9 and a 3.3V voltage source, the other end of the resistor R9 is connected to the source of the MOS tube FET1, the other end of the resistor R10, one end of a resistor R38, and pin 32 of the single-chip computer U1, the other end of the resistor R38 is grounded, and pin 3 of the connection terminal J3 is connected to the other end of the capacitor C15 and grounded;

[0010] The communication module with the daughter board has the same circuit structure as the communication module between the daughter boards. The communication module with the daughter board includes an RJ45 socket J6. The 1st and 2nd pins of the RJ45 socket J6 are connected to the positive electrode of the polar capacitor E5, one end of the capacitor C35 and a 5V voltage source. The 3rd and 4th pins of the RJ45 socket J6 are connected to the negative electrode of the polar capacitor E5, the other end of the capacitor C35 and grounded. The 6th pin of the RJ45 socket J6 is connected to one end of the resistor R31, the lower end pin of the clamping diode D10, and the Pin 29 of the single-chip computer U1 and pin 8 of the RJ45 socket J6 are connected to one end of the resistor R15, the lower pin of the clamping diode D11, and pin 30 of the single-chip computer U1. A pin at the upper end of the clamping diode D10 is connected to a pin at the upper end of the clamping diode D11 and then grounded. Another pin at the upper end of the clamping diode D10 is connected to another pin at the upper end of the clamping diode D11 and then connected to the other end of the resistor R15, the other end of the resistor R31, and a 3.3V voltage source.

[0011] The sub-board control module includes a single-chip microcomputer U21, and the 8-way time-sharing detection module includes an eight-to-one analog switch U24. The 13, 14, 15, 12, 1, 5, 2, and 4 pins of the eight-to-one analog switch U4 are respectively connected to the 1 to 8 pins of the interface J1, one end of the capacitors C1 to C8, and one end of the resistors R2 to R9. The 11, 10, 9, and 6 pins of the eight-to-one analog switch U4 are respectively connected to one end of the resistor R11, one end of the resistor R12, one end of the resistor R13, and one end of the resistor R10. The other ends of the resistors R11 to R13 are respectively connected to the 10, 12, and 13 pins of the single-chip microcomputer U21. The other end of the resistor R10 is grounded, and the other ends of the resistors R2 to R9 are respectively connected to the lower ends of the clamping diodes D21 to D28. Pins, one end of capacitors C10 to C17 and pins 16 to 19, 29 to 32 of the single-chip computer U21, one of the upper ends of the clamping diodes D21 to D28 is connected to one end of capacitor C9 and grounded, another upper end of the clamping diodes D21 to D28 is connected to a 3.3V voltage source, pin 3 of the eight-to-one analog switch U24 is connected to one end of resistor R1 and pin 2 of the voltage regulator U22, the other end of the resistor R1 is connected to pin 1 of the voltage regulator U22, pin 3 of the voltage regulator U22 is connected to the other end of the capacitor C9 and a 5V voltage source, pin 9 of the interface J1 is connected to one end of resistor R26, the other end of the resistor R26, the other end of capacitors C1 to C8, and the other end of capacitors C10 to C17 are connected to ground;

[0012] The communication module with the mainboard includes an RJ45 socket J2, and the 1st and 2nd pins of the RJ45 socket J2 are connected to the positive electrode of the polar capacitor E1, one end of the capacitor C33, and the 1st pin of the voltage regulator U23, and the 3rd and 4th pins of the RJ45 socket J2 are connected to the negative electrode of the polar capacitor E1, the other end of the capacitor C33, the 2nd pin of the voltage regulator U23, the negative electrode of the polar capacitor E2, one end of the capacitor C34 and grounded, and the 6th pin of the RJ45 socket J2 is connected to one end of the resistor R20 and the clamping diode D211. The lower end of the single-chip microcomputer U21, the 8-pin of the RJ45 socket J2 is connected to one end of the resistor R21, the lower end pin of the clamping diode D210, the single-chip microcomputer U21, one of the pins on the upper ends of the clamping diodes D210 and D211 are connected and grounded, and the 3-pin of the voltage regulator U23 is connected to the positive electrode of the polar capacitor E2, the other end of the capacitor C34, the other end of the resistor R20, the other end of the resistor R21, the other pin on the upper ends of the clamping diodes D210 and D211 and connected to a 3.3V voltage source;

[0013] The power supply module includes buck regulators U2 and U3. Pin 8 of the buck regulator U2 is connected to one end of a resistor R27, one end of a capacitor C1, the positive electrode of a polarized capacitor E1, one end of a fuse F1 and a 12V voltage source. The other end of the resistor R27 is connected to one end of a capacitor C30 and pin 6 of the buck regulator U2. Pin 5 of the buck regulator U2 is connected to the other end of the capacitor C30, the other end of the capacitor C1, the negative electrode of the polarized capacitor E1, pins 2 and 3 of an interface J1 and grounded. The other end of the fuse F1 is connected to pin 1 of the interface J1. Pin 1 of the buck regulator U2 is connected to the positive electrode of the capacitor C30, the negative electrode of the capacitor C1, the negative electrode of the polarized capacitor E1, the negative electrode of the ... The pin is connected to one end of the inductor L1, one end of the capacitor C31, and the negative electrode of the diode D5. The other end of the inductor L1 is connected to one end of the resistor R29, one end of the capacitor C33, the positive electrode of the polar capacitor E2, and one end of the capacitor C2 and outputs a 5V voltage source. The other end of the capacitor C33 and the other end of the resistor R29 are connected and then connected to the 4 pin of the buck regulator U2 and one end of the resistor R30. The 3 pin of the buck regulator U2 is connected to one end of the capacitor C32. The other end of the capacitor C32 is connected to one end of the resistor R28. The other end of the capacitor C2, the negative electrode of the polar capacitor E2, the other end of the resistor R30, and the diode D5 The positive electrode, pin 2 of the buck regulator U2, and the other end of the resistor R28 are connected and then grounded; pin 8 of the buck regulator U3 is connected to one end of the resistor R12, one end of the capacitor C9, the positive electrode of the polar capacitor E3 and a 12V voltage source, the other end of the resistor R12 is connected to one end of the capacitor C36, pin 6 of the buck regulator U3, pin 5 of the buck regulator U3 is connected to the other end of the capacitor C36, the other end of the capacitor C9, the negative electrode of the polar capacitor E3 and grounded, pin 1 of the buck regulator U3 is connected to one end of the inductor L2, one end of the capacitor C34, and the negative electrode of the diode D6, the inductor L2 The other end is connected to one end of resistor R33, one end of capacitor C38, the positive electrode of the polar capacitor E6, and one end of capacitor C14 and outputs a 3.3V voltage source. The other end of the capacitor C38 and the other end of the resistor R33 are connected and then connected to pin 4 of the buck regulator U3 and one end of resistor R34. Pin 3 of the buck regulator U3 is connected to one end of capacitor C37. The other end of the capacitor C37 is connected to one end of resistor R32. The other end of the capacitor C14, the negative electrode of the polar capacitor E6, the other end of the resistor R34, the positive electrode of the diode D6, pin 2 of the buck regulator U3, and the other end of the resistor R32 are connected and then grounded.

[0014] After adopting the above structure, since the mainboard detection circuit includes 4-way grounding resistance detection modules and temperature and humidity detection modules, 4-way monitoring and temperature and humidity monitoring can be performed. At the same time, since the sub-board detection circuit includes 8-way time-sharing detection modules, 8-way monitoring can be performed, and the sub-board detection circuit can include up to 3 channels, which can reach 24-channel monitoring. Not only is the monitoring range wider, but the monitoring accuracy is also improved, which can meet the safety warning needs of different equipment on the production line. Furthermore, a wireless communication module is also provided inside the mainboard detection circuit, through which the monitoring data of the mainboard and sub-board detection circuits can be reported in real time, thereby improving the overall equipment convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a control principle diagram of the mainboard detection circuit of the present invention;

[0016] Figure 2 It is a control principle diagram of the daughter board detection circuit of the present invention;

[0017] Figure 3 It is a control principle diagram of the overall structure of the present invention;

[0018] Figure 4 The schematic diagram of the circuit of the main control module and the wireless communication module of the present invention;

[0019] Figure 5 This is a circuit schematic diagram of a 4-way ground resistance detection module of the present invention;

[0020] Figure 6 The schematic diagram of the circuit of the first module for interactive communication with a PC of the present invention;

[0021] Figure 7 is a circuit schematic diagram of the first display module of the present invention;

[0022] Figure 8 The circuit schematic diagram of the temperature and humidity detection module of the present invention;

[0023] Fig. 9 The schematic diagram of the circuit of the present invention and the daughter board communication module;

[0024] Fig.10 It is a circuit schematic diagram of the daughter board control module of the present invention;

[0025] Fig.11 The circuit diagram of the 8-way time-sharing detection module of the present invention;

[0026] Fig.12 The schematic diagram of the circuit of the present invention and the mainboard communication module;

[0027] Fig.13 The schematic diagram of the circuit of the inter-sub-board communication module of the present invention;

[0028] Fig.14 is a circuit schematic diagram of the second display module of the present invention;

[0029] Fig.15 This is a circuit schematic diagram of the power supply module of the present invention. DETAILED DESCRIPTION

[0030] like Figures 1 to 3 As shown, a safety monitoring and early warning circuit device for electric power equipment includes a mainboard detection circuit, a sub-board detection circuit connected to the mainboard detection circuit, and the sub-board detection circuit can include at most three circuits. Specifically, the mainboard detection circuit includes a main control module, and the main control module is respectively connected to a 4-way grounding resistance detection module, a wireless communication module, a first display module, a temperature and humidity detection module, and a sub-board communication module; the sub-board detection circuit includes a sub-board control module, and the sub-board control module is respectively connected to an 8-way time-sharing detection module, a second display module, a mainboard communication module, and an inter-sub-board communication module; it also includes a power supply module, which converts a 12VDC power supply into a 5V and 3.3V voltage source to power other internal modules.

[0031] like Figure 4As shown, the main control module includes a single-chip microcomputer U1, and the wireless communication module includes an E22-400T30S wireless radio frequency chip U5, wherein the single-chip microcomputer U1 is an EFM32TG11B120F128GM32-B single-chip microcomputer, and pins 1 to 3, 23, and 24 of the single-chip microcomputer U1 are connected to the main display module, and pins 4, 11, 14, and 15 of the single-chip microcomputer U1 are connected to one end of capacitors C18 to C22 and a 3.3V voltage source, and pins 5, 6, 10, 12, and 13 of the single-chip microcomputer U1 are respectively connected to pins 3, 4, 5, 1, and 2 of the E22-400T30S wireless radio frequency chip U5. The 6th pin of the S wireless RF chip U5 is connected to the positive electrode of the polarity capacitor E4, one end of the capacitor C16 and a 5V voltage source. The 7th pin of the E22-400T30S wireless RF chip U5 is connected to the negative electrode of the polarity capacitor E4, the other end of the capacitor C16 and one end of the capacitor C17. The other end of the capacitor C17 is connected to the 9th pin of the single-chip computer U1, the positive electrode of the diode D2 and one end of the resistor R20. The negative electrode of the diode D2 is connected to the other end of the resistor R20 and connected to the 3.3V voltage source. The 15th, 16th and 17th pins of the E22-400T30S wireless RF chip U5 are connected and then grounded. The 7th and 8th pins of the single-chip computer U1 are respectively connected to the PC. Interactive communication module, pins 16 to 19 and 31 of the single-chip computer U1 are respectively connected to the 4-way grounding resistance detection module, pins 20 and 28 of the single-chip computer U1 are connected and then connected to one end of capacitor C24, one end of capacitor C25 and a 3.3V voltage source, pin 21 of the single-chip computer U1 is connected to one end of capacitor C23, the other end of capacitor C18 to capacitor C25 is connected and then grounded, pin 22 of the single-chip computer U1 is connected to one end of resistor R18, the other end of resistor R18 is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to one end of resistor R19 and one end of buzzer BZ1, the other end of resistor R19 and buzzer B The other end of Z1 is connected and then connected to a 12V voltage source, the 25 and 26 pins of the single-chip microcomputer U1 are respectively connected to the 2 and 3 pins of the interface J4, the 27 pin of the single-chip microcomputer U1 is connected to one end of the capacitor C3 and one end of the resistor R17, the other end of the resistor R17 is connected to one end of the resistor R13 and one end of the switch K1, the other end of the resistor R13 is connected to pin 1 of the interface J4, one end of the capacitor C6 and a 3.3V voltage source, the other end of the capacitor C3, the other end of the switch K1, the other end of the capacitor C6, and the 4 pin of the interface J4 are connected and then grounded, the 29 and 30 pins of the single-chip microcomputer U1 are connected to the daughter board communication module, and the 32 pin of the single-chip microcomputer U1 is connected to the temperature and humidity detection module.Since the microcontroller U1 uses SILICON LABS's EFM32TG11B120F128GM32-B, its pin configuration is flexible, small in size, and easy for hardware layout. It is connected to the buzzer BZ1 for alarm prompts, and the key switch K1 connected to it can be used for parameter selection and setting. For the E22-400T30S wireless RF chip U5 included in the wireless communication module, it uses LoRa spread spectrum technology and works in the (410.125~493.125MHz) frequency band (default 433.125MHz), which has a longer communication distance and strong anti-interference ability. Through the setting of the wireless communication module and the relay networking, the safety status of the grounding wire of the monitored equipment can be monitored remotely in real time, and the company's MES system can be connected to intelligently control and monitor the production status.

[0032] like Figure 5As shown, the 4-way grounding resistance detection module includes a terminal J2, wherein the 1st pin of the terminal J2 is connected to one end of the resistor R1, one end of the capacitor C39, the lower end pin of the clamping diode D4, and one end of the resistor R40, the 2nd pin of the terminal J2 is connected to one end of the resistor R2, one end of the capacitor C40, the lower end pin of the clamping diode D7, and one end of the resistor R41, the 3rd pin of the terminal J2 is connected to one end of the resistor R3, one end of the capacitor C41, the lower end pin of the clamping diode D8, and one end of the resistor R42, the 4th pin of the terminal J2 is connected to one end of the resistor R4, one end of the capacitor C42, the lower end pin of the clamping diode D9, and one end of the resistor R43, and the other ends of the resistors R1 to R4 are connected to the cathode of the diode D1, the lower end pin of the clamping diode D3, and one end of the resistor R39, and the clamping diodes D3, D4, D7, D8, and D 9, one of the upper ends of the pins is connected to ground, the other ends of the upper ends of the clamping diodes D3, D4, D7, D8, and D9 are connected to the positive electrode of the diode D1 and the 3.3V voltage source, the other ends of the capacitors C39 to C42 are connected to the 5th pin of the interface terminal J2 and one end of the resistor R5, the other end of the resistor R5 is grounded, the other end of the resistor R39 is connected to one end of the capacitor C43 and the 31st pin of the microcontroller U1, the other end of the resistor R40 is connected to one end of the capacitor C44 and the 16th pin of the microcontroller U1, the other end of the resistor R41 is connected to one end of the capacitor C45 and the 17th pin of the microcontroller U1, the other end of the resistor R42 is connected to one end of the capacitor C46 and the 18th pin of the microcontroller U1, the other end of the resistor R43 is connected to one end of the capacitor C47 and the 19th pin of the microcontroller U1, and the other ends of the capacitors C43 to C47 are connected to ground. Since the detected grounding resistance is the equipment ground, in order to prevent the crosstalk voltage from unexpected situations from damaging the detection equipment, a diode D1 is added to the sampling power supply to protect the 3.3V power supply using its single-phase conductivity. The 4-way grounding resistance detection module can be connected to four devices for monitoring. Due to the presence of diode D1 in the module, the 4-way grounding resistance is different or not grounded at the same time, so the current flowing through diode D1 will be different, and the voltage drop above will also be different. If 3.3V is used directly as the reference voltage divider, the detection accuracy will be reduced. By adding an ADC-V for reference voltage division, the sampling is more accurate and the accuracy is higher. The 5-way voltage AD sampling has clamping diodes to enhance the ESD protection function and prevent the MCU pins from being damaged under abnormal conditions. The RC low-pass filter filters out high-frequency interference and improves sampling accuracy.

[0033] like Figure 6As shown, the mainboard detection circuit also includes a first interactive communication module with the PC, and the sub-board detection circuit also includes a second interactive communication module with the PC. The circuit structure of the first interactive communication module with the PC is the same as that of the second interactive communication module with the PC. The first interactive communication module with the PC is taken as an example for detailed description. Specifically, the first interactive communication module with the PC includes a USB to serial port chip U4, and the 4th and 5th pins of the USB to serial port chip U4 are respectively connected to one end of the resistor R23 and one end of the resistor R22, the 6th pin of the USB to serial port chip U4 is connected to one end of the resistor R24, one end of the capacitor C28, and one end of the capacitor C29, the 7th and 8th pins of the USB to serial port chip U4 are connected to one end of the inductor FB1, one end of the capacitor C26, and one end of the capacitor C27, the other end of the resistor R23 is connected to the 3rd pin of the interface J5, the 4th pin of the anti-static ESD diode U6, and one end of the resistor R36, and the other end of the resistor R22 is connected to the interface J5 The 2nd pin of the interface J5, the 2nd pin of the anti-static ESD diode U6, and one end of the resistor R35, the other end of the inductor FB1 is connected to the 1st pin of the interface J5, the 1st pin of the anti-static ESD diode U6, the 6th pin of the interface J5 is connected to one end of the capacitor C5, one end of the resistor R21 and grounded, the 4th and 5th pins of the interface J5 are connected and then connected to the other end of the capacitor C5, the other end of the resistor R21, the 3rd pin of the anti-static ESD diode U6, the other end of the capacitors C26 to C29, and the US The 3rd and 12th pins of the USB-to-serial port chip U4 are connected to ground, the other end of the resistor R36 is connected to one end of the resistor R37, the 18th pin of the USB-to-serial port chip U4, one end of the resistor R26, and the 8th pin of the microcontroller U1, the other end of the resistor R37 is grounded, the other end of the resistor R35 is connected to the 17th pin of the USB-to-serial port chip U4, one end of the resistor R25, and the 7th pin of the microcontroller U1, the other end of the resistor R25 and the other end of the resistor R26 are connected and then connected to a 3.3V voltage source. The first interactive communication module with PC and the second interactive communication module with PC are mainly used for debugging during design and development, wireless networking LoRA ID setting, alarm value setting and monitoring channel number setting. The USB to serial port chip U4 used adopts SILICON LABS's CP2102N-A01-GQFN20, with a baud rate of 3Mbps and a small QFN20 package. Only one USB cable is needed to complete the interconnection with the PC. At the same time, the module is also equipped with an anti-static ESD diode U6 for ESD protection and supports hot plugging.

[0034] like Figure 7As shown, the circuit structure of the first display module is the same as that of the second display module. The structure of the first display module is taken as an example. Specifically, the first display module includes a display screen OLED1. Pins 1, 8, 11, 12, 16, 17, 21 to 25, 29, and 30 of the display screen OLED1 are connected to one end of a capacitor C7, one end of a capacitor C11, one end of a capacitor C10, one end of a resistor R16, one end of a capacitor C12, and one end of a capacitor C13 and are grounded. Pins 2 and 3 of the display screen OLED1 are connected to both ends of a capacitor C8, respectively. Pins 4 and 5 of the display screen OLED1 are connected to both ends of a capacitor C4, respectively. Pins 6 and 9 of the display screen OLED1 are connected to one end of a capacitor C7, respectively. Connect the other end of capacitor C7, the other end of capacitor C11, the other end of capacitor C10, one end of resistor R14, one end of resistor R11 and 3.3V voltage source, the 13, 14, 15 pins of display screen OLED1 are connected to the 23, 24, 2 pins of single-chip U1 respectively, the 18 pin of display screen OLED1 is connected to the other end of resistor R14 and the 3 pin of single-chip U1, the 19 pin of display screen OLED1 is connected to the other end of resistor R11 and the 1 pin of single-chip U1, the other end of resistor R16 is connected to the 26 pin of display screen OLED1, the other end of capacitor C12 and the other end of capacitor C13 are connected to the 27 and 28 pins of display screen OLED1 respectively. The first display module adopts a 0.96-inch yellow and blue two-color OLED display screen with a dot matrix of 128*64, and the displayed data is clear and concise, which is used for on-site scrolling display of temperature and humidity values ​​and monitoring values.

[0035] like Figure 8 As shown, the temperature and humidity detection module includes a wiring terminal J3, through which an external temperature and humidity sensor is connected, pin 1 of the wiring terminal J3 is connected to one end of a resistor R7, one end of a resistor R6, and one end of a capacitor C15, pin 2 of the wiring terminal J3 is connected to one end of a resistor R8, the drain of a MOS tube FET1, and one end of a resistor R10, the other end of the resistor R7 is connected to a 3.3V voltage source, the other end of the resistor R6 and the other end of the resistor R8 are connected and then connected to a 5V voltage source, the gate of the MOS tube FET1 is connected to one end of a resistor R9 and a 3.3V voltage source, the other end of the resistor R9 is connected to the source of the MOS tube FET1, the other end of the resistor R10, one end of a resistor R38, and pin 32 of the single-chip computer U1, the other end of the resistor R38 is grounded, and pin 3 of the wiring terminal J3 is connected to the other end of the capacitor C15 and grounded. An external temperature and humidity sensor is used, with a humidity accuracy of ±2%RH and a temperature accuracy of ±0.3℃. It is connected to the microcontroller U1 through a single bus interface SDA to read and write sensor data.

[0036] like Fig. 9As shown, since the circuit structure of the daughter board communication module is the same as that of the daughter board communication module, the daughter board communication module is taken as an example. Specifically, the daughter board communication module includes an RJ45 socket J6, and the 1st and 2nd pins of the RJ45 socket J6 are connected to the positive electrode of the polar capacitor E5, one end of the capacitor C35 and a 5V voltage source, and the 3rd and 4th pins of the RJ45 socket J6 are connected to the negative electrode of the polar capacitor E5, the other end of the capacitor C35 and grounded, and the 6th pin of the RJ45 socket J6 is connected to one end of the resistor R31, the clamp two The lower pin of the diode D10 and the 29th pin of the microcontroller U1, the 8th pin of the RJ45 socket J6 are connected to one end of the resistor R15, the lower pin of the clamping diode D11, and the 30th pin of the microcontroller U1. A pin at the upper end of the clamping diode D10 is connected to a pin at the upper end of the clamping diode D11 and then grounded. Another pin at the upper end of the clamping diode D10 is connected to another pin at the upper end of the clamping diode D11 and then connected to the other end of the resistor R15 and the other end of the resistor R31 and a 3.3V voltage source. The communication module with the daughter board uses an RJ45 socket to facilitate wiring in the actual application environment. A dual line is selected to power the lower daughter board to increase the load capacity. The communication module between the daughter boards uses UART, and clamping diodes are set on its two ports to enhance ESD protection and avoid interference of the line length on the signal causing damage to the pins of the microcontroller U1.

[0037] like Fig.10 , Fig.11As shown, the daughter board control module includes a single-chip microcomputer U21, which adopts the EFM32TG11B120F128GM32-B single-chip microcomputer, and the 8-way time-sharing detection module includes an eight-choice analog switch U24. The 13, 14, 15, 12, 1, 5, 2, and 4 pins of the eight-choice analog switch U4 correspond to the 1 to 8 pins of the connection interface J1, one end of the capacitors C1 to C8, and one end of the resistors R2 to R9, respectively. The 11, 10, 9, and 6 pins of the eight-choice analog switch U4 are respectively connected to one end of the resistor R11, one end of the resistor R12, one end of the resistor R13, and one end of the resistor R10. The other ends of the resistors R11 to R13 are respectively connected to the 10, 12, and 13 pins of the single-chip microcomputer U21. The other end of the resistor R10 is grounded, and the other ends of the resistors R2 to R9 are divided The lower pins of the clamping diodes D21 to D28, one end of the capacitors C10 to C17 and pins 16 to 19 and 29 to 32 of the microcontroller U21 are respectively connected. One of the upper pins of the clamping diodes D21 to D28 is connected and then connected to one end of the capacitor C9 and grounded. Another upper pin of the clamping diodes D21 to D28 is connected and then connected to a 3.3V voltage source. Pin 3 of the eight-to-one analog switch U24 is connected to one end of the resistor R1 and pin 2 of the voltage regulator U22. The other end of the resistor R1 is connected to pin 1 of the voltage regulator U22. Pin 3 of the voltage regulator U22 is connected to the other end of the capacitor C9 and a 5V voltage source. Pin 9 of the interface J1 is connected to one end of the resistor R26. The other end of the resistor R26, the other end of the capacitors C1 to C8 and the other end of the capacitors C10 to C17 are connected and then grounded. Since the MCU used in the sub-board detection circuit is the same as the MCU model of the main board detection circuit, and the structures of the buzzer alarm, key switch selection circuit, etc. in the two circuits are the same, the sub-board control module is no longer described in detail. The main function of each sub-board detection circuit is to collect 8 grounding resistance values. Since at most three paths need to be arranged, the eight-choose-one analog switch U24 uses 74HC4051 to complete the time-sharing cycle collection of the 8-way grounding resistance value, with low power consumption. In order to ensure that the acquisition accuracy is required to be ±0.1Ω, the constant current method is a good solution. The constant current source uses the voltage regulator U22 as LM1117, and the voltage across R1 is constant at 1.25V, and a constant current of 1.25 / 0.1=12.5mA is obtained. At the same time, the AD sampling in the 8-way time-sharing detection module has clamping diodes to enhance the ESD protection function and prevent the pins of the microcontroller U21 from being damaged under abnormal conditions, and an RC low-pass filter is used to filter out high-frequency interference to further improve the sampling accuracy.

[0038] like Fig.12As shown, the communication module with the mainboard includes an RJ45 socket J2, and the 1st and 2nd pins of the RJ45 socket J2 are connected to the positive electrode of the polarized capacitor E1, one end of the capacitor C33, and the 1st pin of the voltage regulator U23, and the 3rd and 4th pins of the RJ45 socket J2 are connected to the negative electrode of the polarized capacitor E1, the other end of the capacitor C33, the 2nd pin of the voltage regulator U23, the negative electrode of the polarized capacitor E2, one end of the capacitor C34 and grounded, and the 6th pin of the RJ45 socket J2 is connected to one end of the resistor R20 and the clamping diode D2 The lower end of 11, the microcontroller U21, the 8-pin of the RJ45 socket J2 is connected to one end of the resistor R21, the lower pin of the clamping diode D210, the microcontroller U21, one of the pins on the upper end of the clamping diodes D210 and D211 is connected and grounded, and the 3-pin of the voltage regulator U23 is connected to the positive electrode of the polar capacitor E2, the other end of the capacitor C34, the other end of the resistor R20, the other end of the resistor R21, the other pin on the upper end of the clamping diodes D210 and D211 and connected to the 3.3V voltage source. The main board and the sub-board and the sub-boards are interconnected using UART, with a distance of less than 1 meter between each other, and are mainly used for ground resistance monitoring of multiple devices on the same assembly line. The connector uses an RJ45 socket to facilitate wiring in the actual application environment. The 5V power supply uses dual-line power supply to increase the load capacity and ensure the reliability of the inter-stage series power supply. A clamping protection diode is added to the UART communication port to enhance ESD protection and prevent the microcontroller pins from being damaged due to interference from the line length on the signal.

[0039] like Fig.15As shown, the power supply module includes buck regulators U2 and U3, the 8-pin of the buck regulator U2 is connected to one end of the resistor R27, one end of the capacitor C1, the positive electrode of the polarized capacitor E1, one end of the fuse F1 and the 12V voltage source, the other end of the resistor R27 is connected to one end of the capacitor C30, the 6-pin of the buck regulator U2, the 5-pin of the buck regulator U2 is connected to the other end of the capacitor C30, the other end of the capacitor C1, the negative electrode of the polarized capacitor E1, the 2nd and 3rd pins of the interface J1 and grounded, the other end of the fuse F1 is connected to the 1st pin of the interface J1, and the 1st pin of the buck regulator U2 is connected to Connect one end of the inductor L1, one end of the capacitor C31, and the negative electrode of the diode D5. The other end of the inductor L1 is connected to one end of the resistor R29, one end of the capacitor C33, the positive electrode of the polarized capacitor E2, and one end of the capacitor C2, and outputs a 5V voltage source. The other end of the capacitor C33 and the other end of the resistor R29 are connected and then connected to the 4-pin of the buck regulator U2 and one end of the resistor R30. The 3-pin of the buck regulator U2 is connected to one end of the capacitor C32. The other end of the capacitor C32 is connected to one end of the resistor R28. The other end of the capacitor C2, the negative electrode of the polarized capacitor E2, the other end of the resistor R30, and the positive electrode of the diode D5 are connected. The 8th pin of the buck regulator U3 is connected to one end of the resistor R12, one end of the capacitor C9, the positive electrode of the polarized capacitor E3 and the 12V voltage source, the other end of the resistor R12 is connected to one end of the capacitor C36, the 6th pin of the buck regulator U3, the 5th pin of the buck regulator U3 is connected to the other end of the capacitor C36, the other end of the capacitor C9, the negative electrode of the polarized capacitor E3 and grounded, the 1st pin of the buck regulator U3 is connected to one end of the inductor L2, one end of the capacitor C34, the negative electrode of the diode D6, and the other end of the inductor L2 Connect one end of resistor R33, one end of capacitor C38, the positive electrode of polar capacitor E6, one end of capacitor C14 and output 3.3V voltage source, the other end of capacitor C38 and the other end of resistor R33 are connected and then connected to pin 4 of buck regulator U3 and one end of resistor R34, pin 3 of buck regulator U3 is connected to one end of capacitor C37, the other end of capacitor C37 is connected to one end of resistor R32, the other end of capacitor C14, the negative electrode of polar capacitor E6, the other end of resistor R34, the positive electrode of diode D6, pin 2 of buck regulator U3, and the other end of resistor R32 are connected and then grounded. Convert 12VDC into 5VDC voltage source and 3.3VDC voltage source through power supply module to power other modules.

[0040] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A safety monitoring and early warning circuit device for electric power equipment, comprising a mainboard detection circuit, characterized in that: It also includes a sub-board detection circuit connected to the mainboard detection circuit, and the sub-board detection circuit can include at most three circuits. The mainboard detection circuit includes a main control module, and the main control module is respectively connected to a wireless communication module, a 4-way grounding resistance detection module, a first display module, a temperature and humidity detection module, and a sub-board communication module; the sub-board detection circuit includes a sub-board control module, and the sub-board control module is respectively connected to an 8-way time-sharing detection module, a second display module, a mainboard communication module, and an inter-sub-board communication module; it also includes a power supply module, and the power supply module converts a 12VDC power supply into a 12VDC power supply. The main control module includes a single-chip microcomputer U1, and the wireless communication module includes an E22-400T30S wireless radio frequency chip U5. The 1 to 3, 23, and 24 pins of the single-chip microcomputer U1 are connected to the first display module. The 4, 11, 14, and 15 pins of the single-chip microcomputer U1 are connected to one end of the capacitors C18 to C22 and a 3.3V voltage source. The 5, 6, 10, 12, and 13 pins of the single-chip microcomputer U1 are respectively connected to the 3, 4, 5, and 6 pins of the E22-400T30S wireless radio frequency chip U5. Pins 1 and 2, the E22-400T30S wireless RF chip U5 adopts LoRa spread spectrum technology and operates in the 410.125-493.125MHz frequency band. Pin 6 of the E22-400T30S wireless RF chip U5 is connected to the positive electrode of the polarized capacitor E4, one end of the capacitor C16 and a 5V voltage source. Pin 7 of the E22-400T30S wireless RF chip U5 is connected to the negative electrode of the polarized capacitor E4, the other end of the capacitor C16, and one end of the capacitor C17. The other end of the capacitor C17 is connected to pin 9 of the microcontroller U1. , the anode of diode D2, one end of resistor R20, the cathode of diode D2 is connected to the other end of resistor R20 and connected to a 3.3V voltage source, the 15, 16, 17 pins of E22-400T30S wireless RF chip U5 are connected and then grounded; the 7 and 8 pins of the single-chip microcomputer U1 are respectively connected to the first interactive communication module with the PC, the 16 to 19 and 31 pins of the single-chip microcomputer U1 are respectively connected to the 4-way grounding resistance detection module, the 20 and 28 pins of the single-chip microcomputer U1 are connected and then connected to one end of capacitor C24, one end of capacitor C25 and 3.3V voltage source, pin 21 of the single-chip microcomputer U1 is connected to one end of capacitor C23, the other end of the capacitor C18 to capacitor C25 is connected and then grounded, pin 22 of the single-chip microcomputer U1 is connected to one end of resistor R18, the other end of the resistor R18 is connected to the base of transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to one end of resistor R19 and one end of buzzer BZ1, the other end of the resistor R19 and the other end of the buzzer BZ1 are connected and then connected to a 12V voltage source, pins 25 and 26 of the single-chip microcomputer U1 are respectively connected to pins 2 and 3 of interface J4, pin 27 of the single-chip microcomputer U1 is connected to one end of capacitor C3 and one end of resistor R17, the other end of resistor R17 is connected to resistor R13 one end, one end of switch K1, the other end of the resistor R13 is connected to pin 1 of the interface J4, one end of the capacitor C6 and a 3.3V voltage source, the other end of the capacitor C3, the other end of the switch K1, the other end of the capacitor C6, and the 4th pin of the interface J4 are connected and then grounded, the 29th and 30th pins of the single-chip microcomputer U1 are connected to the communication module with the daughter board, and the 32nd pin of the single-chip microcomputer U1 is connected to the temperature and humidity detection module; the 4-way grounding resistance detection module includes a wiring terminal J2, the 1st pin of the wiring terminal J2 is connected to one end of the resistor R1, one end of the capacitor C39, the lower pin of the clamping diode D4, and one end of the resistor R40, the 2nd pin of the wiring terminal J2 is connected to one end of the resistor R2, one end of the capacitor C40, the clamping diode The lower pin of the diode D7 and one end of the resistor R41 are connected, the 3rd pin of the wiring terminal J2 is connected to one end of the resistor R3, one end of the capacitor C41, the lower pin of the clamping diode D8, and one end of the resistor R42, the 4th pin of the wiring terminal J2 is connected to one end of the resistor R4, one end of the capacitor C42, the lower pin of the clamping diode D9, and one end of the resistor R43, the other ends of the resistors R1 to R4 are connected and then connected to the cathode of the diode D1, the lower pin of the clamping diode D3, and one end of the resistor R39, one of the upper pins of the clamping diodes D3, D4, D7, D8, and D9 is connected and then grounded, and the other pin of the upper ends of the clamping diodes D3, D4, D7, D8, and D9 is connected and then connected to the positive pole of the diode D1 The other end of the capacitors C39 to C42 are connected to the 5th pin of the wiring terminal J2 and one end of the resistor R5. The other end of the resistor R5 is grounded. The other end of the resistor R39 is connected to one end of the capacitor C43 and the 31st pin of the microcontroller U1. The other end of the resistor R40 is connected to one end of the capacitor C44 and the 16th pin of the microcontroller U1. The other end of the resistor R41 is connected to one end of the capacitor C45 and the 17th pin of the microcontroller U1. The other end of the resistor R42 is connected to one end of the capacitor C46 and the 18th pin of the microcontroller U1. The other end of the resistor R43 is connected to one end of the capacitor C47 and the 19th pin of the microcontroller U1. The other ends of the capacitors C43 to C47 are connected to the ground.

2. A safety monitoring and early warning circuit device for electric power equipment according to claim 1, characterized in that: The mainboard detection circuit also includes the first interactive communication module with the PC, and the sub-board detection circuit also includes the second interactive communication module with the PC. The first interactive communication module with the PC has the same circuit structure as the second interactive communication module with the PC. The first interactive communication module with the PC includes a USB-to-serial port chip U4. Pins 4 and 5 of the USB-to-serial port chip U4 are respectively connected to one end of a resistor R23 and one end of a resistor R22. Pin 6 of the USB-to-serial port chip U4 is connected to one end of a resistor R24, one end of a capacitor C28, and one end of a capacitor C29. Pins 7 and 8 of the USB-to-serial port chip U4 are connected to one end of an inductor FB1, one end of a capacitor C26, and one end of a capacitor C27. The other end of the resistor R23 is connected to pin 3 of the interface J5, pin 4 of the anti-static ESD diode U6, and one end of a resistor R36. The other end of the resistor R22 is connected to the interface J5 The 2nd pin of the interface J5, the 2nd pin of the anti-static ESD diode U6, and one end of the resistor R35, the other end of the inductor FB1 is connected to the 1st pin of the interface J5, the 1st pin of the anti-static ESD diode U6, the 6th pin of the interface J5 is connected to one end of the capacitor C5, one end of the resistor R21 and grounded, the 4th and 5th pins of the interface J5 are connected and connected to the other end of the capacitor C5, the other end of the resistor R21, the 3rd pin of the anti-static ESD diode U6, the other end of the capacitors C26 to C29, and the U The 3 and 12 pins of the SB to serial port chip U4 are connected and then grounded, the other end of the resistor R36 is connected to one end of the resistor R37, the 18 pin of the USB to serial port chip U4, one end of the resistor R26, and the 8 pin of the microcontroller U1, the other end of the resistor R37 is grounded, the other end of the resistor R35 is connected to the 17 pin of the USB to serial port chip U4, one end of the resistor R25, and the 7 pin of the microcontroller U1, the other end of the resistor R25 and the other end of the resistor R26 are connected and then connected to a 3.3V voltage source.

3. A safety monitoring and early warning circuit device for electric power equipment according to claim 2, characterized in that: The circuit structure of the first display module is the same as that of the second display module. The first display module includes a display screen OLED1. Pins 1, 8, 11, 12, 16, 17, 21 to 25, 29, and 30 of the display screen OLED1 are connected to one end of a capacitor C7, one end of a capacitor C11, one end of a capacitor C10, one end of a resistor R16, one end of a capacitor C12, and one end of a capacitor C13 and are grounded. Pins 2 and 3 of the display screen OLED1 are respectively connected to both ends of a capacitor C8. Pins 4 and 5 of the display screen OLED1 are respectively connected to both ends of a capacitor C4. Pins 6 and 9 of the display screen OLED1 are connected to the other end of the capacitor C7, the other end of the capacitor C11, and the other end of the capacitor C13. One end, the other end of capacitor C10, one end of resistor R14, one end of resistor R11 and a 3.3V voltage source, the 13, 14, and 15 pins of the display screen OLED1 are respectively connected to the 23, 24, and 2 pins of the single-chip microcomputer U1, the 18 pin of the display screen OLED1 is connected to the other end of the resistor R14 and the 3 pin of the single-chip microcomputer U1, the 19 pin of the display screen OLED1 is connected to the other end of the resistor R11 and the 1 pin of the single-chip microcomputer U1, the other end of the resistor R16 is connected to the 26 pin of the display screen OLED1, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively connected to the 27 and 28 pins of the display screen OLED1.

4. A safety monitoring and early warning circuit device for electric power equipment according to claim 3, characterized in that: The temperature and humidity detection module includes a connection terminal J3, through which an external temperature and humidity sensor is connected, pin 1 of the connection terminal J3 is connected to one end of a resistor R7, one end of a resistor R6, and one end of a capacitor C15, pin 2 of the connection terminal J3 is connected to one end of a resistor R8, the drain of a MOS tube FET1, and one end of a resistor R10, the other end of the resistor R7 is connected to a 3.3V voltage source, the other end of the resistor R6 and the other end of the resistor R8 are connected and then connected to a 5V voltage source, the gate of the MOS tube FET1 is connected to one end of a resistor R9 and a 3.3V voltage source, the other end of the resistor R9 is connected to the source of the MOS tube FET1, the other end of the resistor R10, one end of a resistor R38, and pin 32 of the single-chip computer U1, the other end of the resistor R38 is grounded, and pin 3 of the connection terminal J3 is connected to the other end of the capacitor C15 and grounded.

5. A safety monitoring and early warning circuit device for electric power equipment according to claim 4, characterized in that: The communication module with the daughter board has the same circuit structure as the communication module between the daughter boards. The communication module with the daughter board includes an RJ45 socket J6. The 1st and 2nd pins of the RJ45 socket J6 are connected to the positive electrode of the polar capacitor E5, one end of the capacitor C35 and a 5V voltage source. The 3rd and 4th pins of the RJ45 socket J6 are connected to the negative electrode of the polar capacitor E5, the other end of the capacitor C35 and grounded. The 6th pin of the RJ45 socket J6 is connected to one end of the resistor R31, the lower end pin of the clamping diode D10, and the Pin 29 of the single-chip microcomputer U1 and pin 8 of the RJ45 socket J6 are connected to one end of the resistor R15, the lower pin of the clamping diode D11, and pin 30 of the single-chip microcomputer U1; a pin at the upper end of the clamping diode D10 is connected to a pin at the upper end of the clamping diode D11 and then grounded; another pin at the upper end of the clamping diode D10 is connected to another pin at the upper end of the clamping diode D11 and then connected to the other end of the resistor R15, the other end of the resistor R31 and a 3.3V voltage source.

6. A safety monitoring and early warning circuit device for electric power equipment according to any one of claims 1 to 5, characterized in that: The sub-board control module includes a single-chip microcomputer U21, and the 8-way time-sharing detection module includes an eight-choice analog switch U24. The 13, 14, 15, 12, 1, 5, 2, and 4 pins of the eight-choice analog switch U4 correspond to the 1 to 8 pins of the interface J1, one end of the capacitors C1 to C8, and one end of the resistors R2 to R9, respectively. The 11, 10, 9, and 6 pins of the eight-choice analog switch U4 are respectively connected to one end of the resistor R11, one end of the resistor R12, one end of the resistor R13, and one end of the resistor R10. The other ends of the resistors R11 to R13 are respectively connected to the 10, 12, and 13 pins of the single-chip microcomputer U21, the other end of the resistor R10 is grounded, and the other ends of the resistors R2 to R9 are respectively connected to the lower ends of the clamping diodes D21 to D28. Pin 1, one end of capacitors C10 to C17 and pins 16 to 19, 29 to 32 of the single-chip computer U21, one of the upper ends of the clamping diodes D21 to D28 is connected to one end of capacitor C9 and grounded, another upper end of the clamping diodes D21 to D28 is connected to a 3.3V voltage source, pin 3 of the eight-to-one analog switch U24 is connected to one end of resistor R1 and pin 2 of the voltage regulator U22, the other end of the resistor R1 is connected to pin 1 of the voltage regulator U22, pin 3 of the voltage regulator U22 is connected to the other end of the capacitor C9 and a 5V voltage source, pin 9 of the interface J1 is connected to one end of resistor R26, the other end of the resistor R26, the other end of capacitors C1 to C8, and the other end of capacitors C10 to C17 are connected to ground.

7. A safety monitoring and early warning circuit device for electric power equipment according to claim 6, characterized in that: The communication module with the mainboard includes an RJ45 socket J2, and the 1st and 2nd pins of the RJ45 socket J2 are connected to the positive electrode of the polar capacitor E1, one end of the capacitor C33, and the 1st pin of the voltage regulator U23, and the 3rd and 4th pins of the RJ45 socket J2 are connected to the negative electrode of the polar capacitor E1, the other end of the capacitor C33, the 2nd pin of the voltage regulator U23, the negative electrode of the polar capacitor E2, one end of the capacitor C34 and grounded, and the 6th pin of the RJ45 socket J2 is connected to one end of the resistor R20 and the clamping diode D211. The lower end of the single-chip microcomputer U21, the 8-pin of the RJ45 socket J2 is connected to one end of the resistor R21, the lower end pin of the clamping diode D210, the single-chip microcomputer U21, one of the pins on the upper ends of the clamping diodes D210 and D211 are connected and grounded, the 3-pin of the voltage regulator U23 is connected to the positive electrode of the polar capacitor E2, the other end of the capacitor C34, the other end of the resistor R20, the other end of the resistor R21, the other pin on the upper ends of the clamping diodes D210 and D211 and connected to a 3.3V voltage source.

8. A safety monitoring and early warning circuit device for electric power equipment according to claim 7, characterized in that: The power supply module includes buck regulators U2 and U3. Pin 8 of the buck regulator U2 is connected to one end of a resistor R27, one end of a capacitor C1, the positive electrode of a polarized capacitor E1, one end of a fuse F1 and a 12V voltage source. The other end of the resistor R27 is connected to one end of a capacitor C30 and pin 6 of the buck regulator U2. Pin 5 of the buck regulator U2 is connected to the other end of the capacitor C30, the other end of the capacitor C1, the negative electrode of the polarized capacitor E1, pins 2 and 3 of an interface J1 and grounded. The other end of the fuse F1 is connected to pin 1 of the interface J1. Pin 1 of the buck regulator U2 is connected to the positive electrode of the capacitor C30, the negative electrode of the capacitor C1, the negative electrode of the polarized capacitor E1, the negative electrode of the ... The pin is connected to one end of the inductor L1, one end of the capacitor C31, and the negative electrode of the diode D5. The other end of the inductor L1 is connected to one end of the resistor R29, one end of the capacitor C33, the positive electrode of the polar capacitor E2, and one end of the capacitor C2 and outputs a 5V voltage source. The other end of the capacitor C33 and the other end of the resistor R29 are connected and then connected to the 4 pin of the buck regulator U2 and one end of the resistor R30. The 3 pin of the buck regulator U2 is connected to one end of the capacitor C32. The other end of the capacitor C32 is connected to one end of the resistor R28. The other end of the capacitor C2, the negative electrode of the polar capacitor E2, the other end of the resistor R30, and the diode D5 The positive electrode, pin 2 of the buck regulator U2, and the other end of the resistor R28 are connected and then grounded; pin 8 of the buck regulator U3 is connected to one end of the resistor R12, one end of the capacitor C9, the positive electrode of the polar capacitor E3 and a 12V voltage source, the other end of the resistor R12 is connected to one end of the capacitor C36, pin 6 of the buck regulator U3, pin 5 of the buck regulator U3 is connected to the other end of the capacitor C36, the other end of the capacitor C9, the negative electrode of the polar capacitor E3 and grounded, pin 1 of the buck regulator U3 is connected to one end of the inductor L2, one end of the capacitor C34, and the negative electrode of the diode D6, the inductor L2 The other end is connected to one end of resistor R33, one end of capacitor C38, the positive electrode of the polar capacitor E6, and one end of capacitor C14 and outputs a 3.3V voltage source. The other end of the capacitor C38 and the other end of the resistor R33 are connected and then connected to pin 4 of the buck regulator U3 and one end of resistor R34. Pin 3 of the buck regulator U3 is connected to one end of capacitor C37. The other end of the capacitor C37 is connected to one end of resistor R32. The other end of the capacitor C14, the negative electrode of the polar capacitor E6, the other end of the resistor R34, the positive electrode of the diode D6, pin 2 of the buck regulator U3, and the other end of the resistor R32 are connected and then grounded.

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