High-voltage contact inspection system

Abstract

The utility model discloses a high-voltage contact inspection system, which mainly solves the problems of long detection time and higher detection cost of a high-insulation detected object in the conventional test system. The system comprises a single-chip microcomputer master control module, a first power supply module, a data storage module, an RS485 communication module and an isolation driving high-voltage relay module which are connected with the single-chip microcomputer master control module, and a second power supply module and a high-voltage contact inspection module which are connected with the isolation driving high-voltage relay module. The device can effectively cope with a high-insulation detected object with the insulation performance larger than 50G, solves the problem that the high-insulation material is easily submerged by environmental noise due to weak signals when the high-insulation material is processed by a traditional detection method, and improves the capturing capability of the detection signal of the high-insulation detected object. Therefore, the performance of the high-insulation tested object can be judged timely and accurately, and the efficiency of the automatic control test of the high-insulation tested object is improved through the switching control of the two high-voltage relays.

Description

Technical Field

[0001] This utility model relates to the field of pressure resistance testing technology, specifically to a high-voltage contact inspection system. Background Technology

[0002] In modern industrial production and electrical equipment testing, safety testing is increasingly important as a crucial step in ensuring product safety and reliability. With technological advancements and rising industry standards, the requirements for withstand voltage and insulation performance in safety testing are showing a continuous upward trend. Simultaneously, the widespread application of automated control technology has placed even more stringent demands on the accuracy and efficiency of the testing process. Against this backdrop, the ability to quickly and effectively test the tested items and accurately distinguish between genuine and defective products has become a core requirement for industry development.

[0003] Existing technologies demonstrate excellent adaptability and efficiency when dealing with test objects (DAMPes) with insulation properties below 10G. Through mature detection principles and algorithms, they can rapidly capture changes in key parameters of the DAMPe during withstand voltage and insulation tests. For example, by utilizing high-precision sensors to acquire current and voltage signals in real time, and combining this with the rapid data processing capabilities of automated control systems, performance evaluation of the DAMPe can be completed in a short time. This technological solution not only meets the testing needs of conventional products but also seamlessly integrates with automated production line processes, enabling rapid batch screening of DAMPes and significantly improving production efficiency and quality control levels.

[0004] However, when faced with highly insulating test objects (Test Objects) with insulation properties exceeding 50G, existing technologies reveal significant limitations. The unique properties of highly insulating Test Objects render traditional testing methods ineffective. On one hand, the extremely low conductivity of highly insulating materials results in extremely weak signals during testing, easily drowned out by environmental noise, making it difficult for sensors to accurately capture valid detection signals. On the other hand, existing automated control algorithms suffer from insufficient sensitivity and weak anti-interference capabilities when processing such weak signals, failing to promptly and accurately assess the performance of the Test Object. These technical bottlenecks directly lead to a significant decrease in the efficiency of automated control testing when testing highly insulating Test Objects. In actual production, this not only increases testing time and costs but may also disrupt the smooth operation of the production line due to untimely testing, and even cause some high-quality products with high insulation performance to be misjudged or missed, posing a potential threat to product quality and corporate reputation. Utility Model Content

[0005] The purpose of this invention is to provide a high-voltage contact inspection system, which mainly solves the problems of long testing time and high testing cost for high-insulation test objects in existing testing systems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A high-voltage contact inspection system includes a microcontroller main control module, a first power supply module, a data storage module, an RS485 communication module and an isolation drive high-voltage relay module connected to the microcontroller main control module, and a second power supply module and a high-voltage contact inspection module connected to the isolation drive high-voltage relay module.

[0008] The high-voltage contact inspection module includes a relay RL1 and a resistor R59 connected to the high-voltage output terminal of the host, a resistor R61 connected to the other end of the relay RL1, a resistor R62 connected to the circuit terminal of the host, a relay RL2 connected to the other end of the resistor R62, and a resistor R60 connected to the other end of the relay RL2. The other end of the resistor R59 is the high-voltage output terminal, the other end of the resistor R60 is the high-end input of the contact inspection, the other end of the resistor R61 is the low-end input of the contact inspection, and the other end of the resistor R62 is the circuit input terminal.

[0009] Furthermore, in this utility model, the microcontroller main control module includes a main control chip U4, a crystal oscillator XTAL1 whose third pin is connected to the OSC_IN pin of the main control chip U4 and whose first pin is connected to the OSC_OUT pin of the main control chip U4, a capacitor C9 connected between the second and third pins of the crystal oscillator XTAL1, a capacitor C10 connected between the first and fourth pins of the crystal oscillator XTAL1, a resistor R31 whose one end is connected to the BOOT0 pin of the main control chip U4 and the other end is grounded, a capacitor C16 whose one end is connected to the NRST pin of the main control chip U4 and the other end is grounded, and a capacitor R31 whose one end is connected to the main control chip U4. A resistor R22 is connected to the NRST pin and the other end is connected to a 3.3V voltage; a capacitor C18 is connected to the VREF+ pin of the main control chip U4 and the other end is grounded; a capacitor C19 is connected to the VDDA pin of the main control chip U4 and the other end is grounded; a resistor R29 is connected to the PB2 pin of the main control chip U4 and the other end is grounded; and a program programming port CN1 is connected to the PA14 pin and the NRST pin of the main control chip U4; wherein, a resistor R27 is connected between the 4th and 5th pins of the program programming port CN1, and a resistor R28 is connected between the 2nd and 5th pins of the program programming port CN1.

[0010] Further, in this utility model, the first power module includes an AC input interface JH1, a rectifier D12 connected to the AC input interface JH1, an electrolytic capacitor CE1 whose positive terminal is connected to the positive terminal of the rectifier D12 and whose negative terminal is grounded, a capacitor C3 connected in parallel across the electrolytic capacitor CE1, a voltage regulator chip U10 whose input terminal is connected to the positive terminal of the electrolytic capacitor CE1 and whose GND port is connected to the negative terminal of the electrolytic capacitor CE1, an electrolytic capacitor C5 whose positive terminal is connected to the output terminal of the voltage regulator chip U10 and whose negative terminal is connected to the GNG terminal of the voltage regulator chip U10, and a capacitor C3 connected in parallel across the electrolytic capacitor C5. The system consists of capacitor C6, capacitor C4 connected in parallel across capacitor C6, voltage regulator chip U11 whose input terminal is connected to the output terminal of voltage regulator chip U10 and whose GND port is connected to the GND port of voltage regulator chip U10, capacitor C11 connected between the output terminal and GND port of voltage regulator chip U11, and electrolytic capacitor C2 whose positive terminal is connected to the output terminal and negative terminal is connected to the GND port of voltage regulator chip U11. Among these, the positive terminal of electrolytic capacitor CE1 outputs +12V, the positive terminal of electrolytic capacitor C5 outputs +5V, and the output terminal of voltage regulator chip U11 outputs +3.3V.

[0011] Furthermore, in this utility model, the data storage module includes a storage chip U3, a capacitor C8 with one end connected to the 8th pin of the storage chip U3 and the other end grounded, a resistor R32 connected between the 6th and 8th pins of the storage chip U3, a resistor R33 connected between the 5th and 8th pins of the storage chip U3, a resistor R34 with one end connected to the 6th pin of the storage chip U3 and the other end connected to the SCL pin of the main control chip U4, and a resistor R18 with one end connected to the 5th pin of the storage chip U3 and the other end connected to the SDA pin of the main control chip U4.

[0012] Furthermore, in this utility model, the second power module includes an AC input interface JH2, a rectifier D13 connected to the AC input interface JH2, a capacitor C12 connected between the positive and negative terminals of the rectifier D13, and an electrolytic capacitor CE2 whose positive terminal is connected to the positive terminal of the rectifier D13 and whose negative terminal is connected to the negative terminal of the rectifier D13 and grounded; wherein, the positive terminal of the electrolytic capacitor CE2 outputs a +24V voltage.

[0013] Furthermore, in this utility model, the isolated high-voltage relay module includes an isolation chip U7, a resistor R53 connected at one end to the PA1 pin of the main control chip U1 and at the other end to the second pin of the isolation chip U7, a resistor R54 connected at one end to the PA0-WKUP pin of the main control chip U1 and at the other end to the fourth pin of the isolation chip U7, a resistor R56 connected at one end to the 15th pin of the isolation chip U7 and at the other end to ground, a resistor R56 connected at one end to the 13th pin of the isolation chip U7 and at the other end to ground, and a relay driver chip U9 whose first pin is connected to the 15th pin of the isolation chip U7 via resistor R41 and whose second pin is connected to the 13th pin of the isolation chip U7 via resistor R42; wherein, the 16th pin of the relay driver chip U9 is connected to the control terminal of the relay RL1; the 15th pin of the relay driver chip U9 is connected to the control terminal of the relay RL2; and the 9th pin of the relay driver chip U9 is connected to the +24V voltage output by the second power supply module.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The high-voltage contact inspection system of this utility model can effectively deal with high insulation test objects with insulation performance greater than 50G through the specific connection method of relays and resistors in the high-voltage contact inspection module. It solves the problem that the traditional detection method is easily drowned out by environmental noise due to weak signal when dealing with high insulation materials. It improves the ability to capture detection signals of high insulation test objects, so that the performance of high insulation test objects can be judged in a timely and accurate manner. At the same time, by using the switching control of two high-voltage relays, the efficiency of automated control testing of high insulation test objects is improved.

[0016] (2) The cooperation between the microcontroller main control module, data storage module, and isolation drive high voltage relay module of this utility model enables the system to have higher sensitivity and stronger anti-interference ability when processing weak detection signals of highly insulated test objects. It can accurately capture changes in current, voltage and other signals during the detection process, reduce misjudgment or missed detection of high-quality products due to signal processing problems, and improve the accuracy and reliability of detection.

[0017] (3) The first power supply module and the second power supply module of this utility model provide stable +12V, +5V, +3.3V, +24V and other voltages for each part of the system. The isolation drive high voltage relay module adopts the design of isolation chip, etc., which realizes effective isolation between the high voltage part and the control part, improves the stability and safety of the system in the high voltage environment, and enables it to better connect with the automated process in industrial production, meeting the stringent requirements of modern industrial production for the accuracy and efficiency of safety testing. Attached Figure Description

[0018] Figure 1 This is a block diagram illustrating the overall structural principle of this utility model.

[0019] Figure 2 This is the circuit diagram of the high-voltage contact inspection module of this utility model.

[0020] Figure 3 This is the circuit diagram of the microcontroller main control module in this utility model.

[0021] Figure 4 This is a circuit diagram of the first power supply module in this utility model.

[0022] Figure 5 This is a circuit diagram of the data storage module in this utility model.

[0023] Figure 6 This is a circuit diagram of the second power supply module in this utility model.

[0024] Figure 7 This is a circuit diagram of the isolation drive high-voltage relay module in this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0026] Example

[0027] like Figure 1 As shown, this utility model discloses a high-voltage contact inspection system, which mainly consists of a microcontroller main control module, a first power supply module, a data storage module, an RS485 communication module, an isolation drive high-voltage relay module, a second power supply module, and a high-voltage contact inspection module. The modules are interconnected and cooperate to effectively inspect the high-voltage contact condition. The RS485 communication module is a commonly available module.

[0028] like Figure 2 As shown, the high-voltage contact inspection module is used to connect to the high-voltage output terminal and the circuit terminal of the main unit to inspect the high-voltage contact condition. This module specifically includes relay RL1, resistors R59, R61, and R62, relay RL2, and resistor R60. One end of relay RL1 is connected to the high-voltage output terminal of the main unit, and the other end is connected to resistor R61; one end of resistor R59 is connected between relay RL1 and the high-voltage output terminal of the main unit, and the other end serves as the high-voltage output terminal; one end of resistor R62 is connected to the circuit terminal of the main unit, and the other end is connected to relay RL2; one end of resistor R60 is connected to relay RL2, and the other end serves as the high-side input for contact inspection; the other end of resistor R61 serves as the low-side input for contact inspection; and the other end of resistor R62 serves as the circuit input terminal.

[0029] like Figure 3 As shown, the microcontroller main control module is the control core of the entire system, responsible for controlling and processing data from all modules. This module includes an APM32E103VET6 main control chip U4, a crystal oscillator XTAL1, capacitors C9 and C10, resistors R31, C16, R22, C18, C19, and R29, as well as a programmable port CN1.

[0030] Pin 3 of crystal oscillator XTAL1 is connected to the OSC_IN pin of the main control chip U4, and pin 1 is connected to the OSC_OUT pin of the main control chip U4, providing a stable clock signal for the chip. Capacitor C9 is connected between pins 2 and 3 of crystal oscillator XTAL1, and capacitor C10 is connected between pins 1 and 4 of crystal oscillator XTAL1 to stabilize the oscillation frequency of the crystal oscillator.

[0031] One end of resistor R31 is connected to the BOOT0 pin of the main control chip U4, and the other end is grounded, used to set the chip's boot mode. One end of capacitor C16 is connected to the NRST pin of the main control chip U4, and the other end is grounded; one end of resistor R22 is connected to the NRST pin of the main control chip U4, and the other end is connected to a 3.3V voltage. Together, they form a reset circuit to ensure that the chip can reset normally under abnormal conditions.

[0032] One end of capacitor C18 is connected to the VREF+ pin of the main control chip U4, and the other end is grounded to stabilize the reference voltage. One end of capacitor C19 is connected to the VDDA pin of the main control chip U4, and the other end is grounded to provide filtering for the chip's analog power supply. One end of resistor R29 is connected to the PB2 pin of the main control chip U4, and the other end is grounded to act as a pull-down resistor.

[0033] The programming port CN1 is connected to pins PA14 and NRST of the main control chip U4 and is used to program the chip. Resistor R27 is connected between pins 4 and 5 of the programming port CN1, and resistor R28 is connected between pins 2 and 5. These two resistors are used to protect the programming port and the chip from damage caused by electrostatic discharge or other interference.

[0034] like Figure 4 As shown, the first power supply module provides a stable operating voltage for the system, including AC input interface JH1, rectifier D12, electrolytic capacitor CE1, capacitor C3, voltage regulator chip U10, electrolytic capacitor C5, capacitor C6, capacitor C4, voltage regulator chip U11, capacitor C11, and electrolytic capacitor C2.

[0035] The AC input interface JH1 is used to connect to an 8.5V AC power supply. Rectifier D12 is connected to the AC input interface JH1 to convert AC to DC. The positive terminal of electrolytic capacitor CE1 is connected to the positive terminal of rectifier D12, and the negative terminal is grounded, filtering the rectified DC. Capacitor C3 is connected in parallel across electrolytic capacitor CE1 to further improve the filtering effect.

[0036] The voltage regulator chip U10 rectifies the AC 8.5V and steps it down to DC 5V. The input terminal of the voltage regulator chip U10 is connected to the positive terminal of the electrolytic capacitor CE1, and the GND terminal is connected to the negative terminal of the electrolytic capacitor CE1, stabilizing the input voltage to an intermediate level. The positive terminal of the electrolytic capacitor C5 is connected to the output terminal of the voltage regulator chip U10, and the negative terminal is connected to the GNG terminal of the voltage regulator chip U10, further filtering the regulated voltage. Capacitor C6 is connected in parallel across electrolytic capacitor C5, and capacitor C4 is connected in parallel across capacitor C6 to enhance the filtering effect.

[0037] Voltage regulator U1 rectifies the DC 5V and steps it down to DC 3.3V. The input of voltage regulator U11 is connected to the output of voltage regulator U10, and its GND port is connected to the GND port of voltage regulator U10, further stabilizing the intermediate voltage to the +3.3V required by the system. Capacitor C11 is connected between the output of voltage regulator U11 and its GND port. The positive terminal of electrolytic capacitor C2 is connected to the output of voltage regulator U11, and its negative terminal is connected to the GND port of voltage regulator U11, filtering and storing energy for the +3.3V voltage. Specifically, the positive terminal of electrolytic capacitor CE1 outputs +12V, the positive terminal of electrolytic capacitor C5 outputs +5V, and the output of voltage regulator U11 outputs +3.3V.

[0038] like Figure 5 As shown, the data storage module is used to store relevant data during system operation, including storage chip U3, capacitor C8, resistor R32, resistor R33, resistor R34 and resistor R18.

[0039] One end of capacitor C8 is connected to pin 8 of memory chip U3, and the other end is grounded, filtering the power supply of the memory chip. Resistor R32 is connected between pins 6 and 8 of memory chip U3, and resistor R33 is connected between pins 5 and 8 of memory chip U3, acting as a pull-up resistor. One end of resistor R34 is connected to pin 6 of memory chip U3, and the other end is connected to the SCL pin of the main control chip U4; one end of resistor R18 is connected to pin 5 of memory chip U3, and the other end is connected to the SDA pin of the main control chip U4, enabling I2C communication between the memory chip and the main control chip.

[0040] like Figure 6As shown, the second power supply module provides +24V voltage to the isolated drive high voltage relay module, including AC input interface JH2, rectifier D13, capacitor C12 and electrolytic capacitor CE2.

[0041] The AC input interface JH2 is used to connect to an 18V AC power supply. Rectifier D13 is connected to the AC input interface JH2 to convert AC to DC. Capacitor C12 is connected between the positive and negative terminals of rectifier D13 to filter the rectified voltage. The positive terminal of electrolytic capacitor CE2 is connected to the positive terminal of rectifier D13, and the negative terminal is connected to the negative terminal of rectifier D13 and grounded, further filtering and storing energy. The positive terminal of electrolytic capacitor CE2 outputs +24V.

[0042] like Figure 7 As shown, the isolation drive high-voltage relay module is used to drive relays RL1 and RL2 in the high-voltage contact check module, realizing the isolation between the high-voltage section and the low-voltage control section, and improving the safety and reliability of the system. This module includes an isolation chip U7, resistors R53, R54, and R56, a relay driver chip U9, resistors R41 and R42.

[0043] One end of resistor R53 is connected to pin PA1 of the main control chip U1, and the other end is connected to pin 2 of the isolation chip U7. One end of resistor R54 is connected to pin PA0-WKUP of the main control chip U1, and the other end is connected to pin 4 of the isolation chip U7, transmitting the control signals from the main control chip to the isolation chip. One end of resistor R56 is connected to pin 15 of the isolation chip U7, and the other end is grounded; another resistor R56 has one end connected to pin 13 of the isolation chip U7, and the other end is grounded, acting as a pull-down resistor.

[0044] Pin 1 of relay driver chip U9 is connected to pin 15 of isolation chip U7 via resistor R41, and pin 2 is connected to pin 13 of isolation chip U7 via resistor R42, receiving the drive signal output from the isolation chip. Pin 16 of relay driver chip U9 is connected to the control terminal of relay RL1, and pin 15 is connected to the control terminal of relay RL2, controlling the on / off state of relays RL1 and RL2 respectively. Pin 9 of relay driver chip U9 is connected to the +24V voltage output from the second power supply module, providing the necessary power for relay driving.

[0045] This utility model's high-voltage contact inspection system, through a specific connection method of relays and resistors in the high-voltage contact inspection module, can effectively handle highly insulating test objects with insulation performance greater than 50G. It solves the problem that traditional detection methods are easily drowned out by environmental noise due to weak signals when dealing with highly insulating materials, and improves the ability to capture detection signals of highly insulating test objects. Thus, it can judge the performance of highly insulating test objects in a timely and accurate manner. At the same time, by using the switching control of two high-voltage relays, the efficiency of automated control testing of highly insulating test objects is improved.

[0046] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A high voltage contact inspection system characterized by, It includes a microcontroller main control module, a first power supply module, a data storage module, an RS485 communication module and an isolation drive high voltage relay module connected to the microcontroller main control module, and a second power supply module and a high voltage contact check module connected to the isolation drive high voltage relay module. The high-voltage contact inspection module includes a relay RL1 and a resistor R59 connected to the high-voltage output terminal of the host, a resistor R61 connected to the other end of the relay RL1, a resistor R62 connected to the circuit terminal of the host, a relay RL2 connected to the other end of the resistor R62, and a resistor R60 connected to the other end of the relay RL2. The other end of the resistor R59 is the high-voltage output terminal, the other end of the resistor R60 is the high-end input of the contact inspection, the other end of the resistor R61 is the low-end input of the contact inspection, and the other end of the resistor R62 is the circuit input terminal.

2. A high pressure contact inspection system according to claim 1, wherein The microcontroller main control module includes a main control chip U4, a crystal oscillator XTAL1 whose pin 3 is connected to the OSC_IN pin of the main control chip U4 and whose pin 1 is connected to the OSC_OUT pin of the main control chip U4, a capacitor C9 connected between pins 2 and 3 of the crystal oscillator XTAL1, a capacitor C10 connected between pins 1 and 4 of the crystal oscillator XTAL1, a resistor R31 with one end connected to the BOOT0 pin of the main control chip U4 and the other end grounded, a capacitor C16 with one end connected to the NRST pin of the main control chip U4 and the other end grounded, and a capacitor R31 with one end connected to the NRST pin of the main control chip U4. The circuit consists of a resistor R22 connected to one end of a pin and the other end connected to a 3.3V voltage; a capacitor C18 connected to the VREF+ pin of the main control chip U4 and the other end grounded; a capacitor C19 connected to the VDDA pin of the main control chip U4 and the other end grounded; a resistor R29 connected to the PB2 pin of the main control chip U4 and the other end grounded; and a programming port CN1 connected to the PA14 and NRST pins of the main control chip U4. A resistor R27 is connected between pins 4 and 5 of the programming port CN1, and a resistor R28 is connected between pins 2 and 5 of the programming port CN1.

3. The high-voltage contact inspection system according to claim 2, characterized in that, The first power module includes an AC input interface JH1, a rectifier D12 connected to the AC input interface JH1, an electrolytic capacitor CE1 whose positive terminal is connected to the positive terminal of the rectifier D12 and whose negative terminal is grounded, a capacitor C3 connected in parallel across the electrolytic capacitor CE1, a voltage regulator chip U10 whose input terminal is connected to the positive terminal of the electrolytic capacitor CE1 and whose GND port is connected to the negative terminal of the electrolytic capacitor CE1, an electrolytic capacitor C5 whose positive terminal is connected to the output terminal of the voltage regulator chip U10 and whose negative terminal is connected to the GNG terminal of the voltage regulator chip U10, a capacitor C6 connected in parallel across the electrolytic capacitor C5, and a capacitor C6 connected in parallel across the electrolytic capacitor C5. The capacitor C4 is connected across capacitor C6; the input terminal of voltage regulator chip U11 is connected to the output terminal of voltage regulator chip U10, and the GND port is connected to the GND port of voltage regulator chip U10; capacitor C11 is connected between the output terminal and the GND port of voltage regulator chip U11; and electrolytic capacitor C2 is connected to the output terminal and the GND port of voltage regulator chip U11. Among these, the positive terminal of electrolytic capacitor CE1 outputs +12V voltage, the positive terminal of electrolytic capacitor C5 outputs +5V voltage, and the output terminal of voltage regulator chip U11 outputs +3.3V voltage.

4. The high-voltage contact inspection system according to claim 3, characterized in that, The data storage module includes a memory chip U3, a capacitor C8 with one end connected to pin 8 of the memory chip U3 and the other end grounded, a resistor R32 connected between pins 6 and 8 of the memory chip U3, a resistor R33 connected between pins 5 and 8 of the memory chip U3, a resistor R34 with one end connected to pin 6 of the memory chip U3 and the other end connected to the SCL pin of the main control chip U4, and a resistor R18 with one end connected to pin 5 of the memory chip U3 and the other end connected to the SDA pin of the main control chip U4.

5. A high-voltage contact inspection system according to claim 4, characterized in that, The second power module includes an AC input interface JH2, a rectifier D13 connected to the AC input interface JH2, a capacitor C12 connected between the positive and negative terminals of the rectifier D13, and an electrolytic capacitor CE2 whose positive terminal is connected to the positive terminal of the rectifier D13 and whose negative terminal is connected to the negative terminal of the rectifier D13 and grounded; wherein, the positive terminal of the electrolytic capacitor CE2 outputs a +24V voltage.

6. A high-voltage contact inspection system according to claim 5, characterized in that, The isolated high-voltage relay module includes an isolation chip U7, a resistor R53 connected at one end to the PA1 pin of the main control chip U1 and at the other end to the second pin of the isolation chip U7, a resistor R54 connected at one end to the PA0-WKUP pin of the main control chip U1 and at the other end to the fourth pin of the isolation chip U7, a resistor R56 connected at one end to the 15th pin of the isolation chip U7 and at the other end to ground, a resistor R56 connected at one end to the 13th pin of the isolation chip U7 and at the other end to ground, and a relay driver chip U9 whose first pin is connected to the 15th pin of the isolation chip U7 via resistor R41 and whose second pin is connected to the 13th pin of the isolation chip U7 via resistor R42; wherein, the 16th pin of the relay driver chip U9 is connected to the control terminal of the relay RL1; the 15th pin of the relay driver chip U9 is connected to the control terminal of the relay RL2; and the 9th pin of the relay driver chip U9 is connected to the +24V voltage output from the second power supply module.

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