Safety tester based on LORA wireless communication and GD32 single-chip microcomputer

Abstract

The utility model discloses and provides a safety tester based on LORA wireless communication and a GD32 single-chip microcomputer. The device is characterized by comprising a main controller module, a voltage-withstanding insulation test module, a grounding resistance test module, a temperature and humidity detection module, an LORA wireless communication module, a serial port communication module and an OLED display module. According to the utility model, the 32-bit controller and the LORA wireless communication technology are adopted, aiming at the condition that the detection data needs to be transmitted for a long distance, the voltage-withstanding insulation test condition, the grounding resistance test condition, the temperature and the humidity can be effectively detected, and the real-time data can be displayed on the OLED screen and the computer. Compared with a traditional safety tester, the safety tester provided by the utility model has the advantages that the data transmission distance is long and can reach thousands of meters, the anti-interference capability is stronger, and the safety tester in the LORA communication mode can be used for carrying out a voltage-withstanding insulation test and a grounding resistance test.

Description

Technical Field

[0001] The utility model relates to a safety test instrument, in particular to a safety test instrument based on LORA wireless communication and a GD32 single chip microcomputer. Background Art

[0002] Safety test instruments refer to equipment used for withstand voltage measurement tests of high-voltage equipment and components. The communication methods of traditional safety testers are usually divided into wired and wireless. Wired connections, such as serial ports and USB, are stable and reliable, but they are bulky and inflexible when integrating multiple devices and operating remotely. Wireless communication usually uses WIFI, but its transmission range is limited, about 30 to 50 meters indoors and about 100 meters outdoors. For remote or remote areas, WIFI signals may not be covered, especially in scenarios such as large-scale factory areas. If a relay network is used, setting up and managing multiple repeaters will be complicated and time-consuming, increasing costs. These factors affect the ease of use and test efficiency of safety testers and increase production costs. Therefore, a safety tester capable of long-distance communication is needed to solve the problem of limited communication distance of traditional safety testers. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a safety tester based on LORA wireless communication and GD32 single chip microcomputer, which is flexible, has low signal transmission loss, has a long transmission distance, and can perform withstand voltage insulation test and ground resistance test.

[0004] The utility model solves the above technical problems by a technical solution: a safety tester based on LORA wireless communication and GD32 single-chip microcomputer, including a main controller module, a withstand voltage insulation test module, a ground resistance test module, a temperature and humidity detection module, a LORA wireless communication module, a serial communication module and an OLED display module. The withstand voltage insulation test module, the ground resistance test module, the temperature and humidity detection module, the LORA wireless communication module, the serial communication module and the OLED display module are respectively connected to the main controller module.

[0005] Specifically, the main controller module is a high-performance 32-bit ARM processor, model GD32F373CBT6, which has built-in 256K bytes of Flash memory and 32K bytes of SRAM, and has a wide range of enhanced I / O ports, each of which can be set as an external interrupt input pin.

[0006] Specifically, the ground resistance test module includes a precision voltage transformer, a precision current transformer, and four OP07 chips. OP07 is an operational amplifier that plays the role of signal amplification and voltage following.

[0007] Specifically, the withstand voltage insulation test module includes a boost circuit module and a logic operation module. The boost circuit module includes a transformer and a relay, and the logic operation module includes four OP07 operational amplifiers.

[0008] Specifically, the sending module and receiving module of the LORA wireless communication module are composed of the MW1268 radio frequency chip and its peripheral circuits. It has the characteristics of strong anti-interference ability, long transmission distance and low power consumption, and is used to transmit the data collected by the tester to the staff's computer or mobile phone in real time.

[0009] Specifically, the OLED display module is an OLED display screen, and various parameter values ​​are displayed in real time on the OLED display screen through IIC communication.

[0010] Specifically, the serial communication module includes NS18121 and MAX232 chips. MAX232 is used to convert the logic level into the positive and negative voltages required by the RS-232 standard, so that the controller can communicate with devices compatible with the RS-232 standard.

[0011] Specifically, the temperature and humidity detection module is composed of a DHT11 temperature and humidity sensor and its peripheral circuits.

[0012] The utility model adopts the STM32 series basic ARM Cortex-M3 core microprocessor as the main controller. The main controller collects data from the withstand voltage insulation test module, the ground resistance test module, and the temperature and humidity detection module, analyzes and processes the collected data, and displays it on the OLED display module. At the same time, the main controller transmits the data collected by the tester to the staff's computer or mobile phone in real time through the LORA wireless communication module.

[0013] The beneficial effects of the utility model are mainly as follows: the utility model adopts a high-performance 32-bit low-power ARM microprocessor as the main controller to improve the real-time performance and control function of the safety tester. At the same time, the LORA wireless communication technology is adopted to achieve a communication distance of several kilometers or even tens of kilometers, and the operator can monitor the various data of the safety tester in real time at a long distance. Compared with traditional WIFI communication, LORA wireless communication does not require a relay network, is simple to deploy, low cost, and has excellent anti-interference performance, and can work stably in complex wireless environments. Due to its long transmission distance, the physical obstacles of buildings have little effect on it, which is particularly suitable for large-scale factory areas, outdoor and other scenes. The low power consumption and long-distance communication characteristics of LORA technology enable it to transmit data stably and reliably, providing new possibilities for the use of safety testers in remote areas and large-scale factory areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a specific circuit diagram of the main controller module of the utility model;

[0016] Figure 3 It is a specific circuit diagram of the boost circuit in the withstand voltage insulation test module of the utility model;

[0017] Figure 4 It is a specific circuit diagram of the logic operation circuit in the voltage insulation test module of the utility model;

[0018] Figure 5 This is a specific circuit diagram of the voltage acquisition circuit of the ground resistance test module of the utility model;

[0019] Figure 6 Specific circuit diagram of the logic operation circuit for ground resistance test of the utility model;

[0020] Figure 7 This is a specific circuit diagram of the wireless communication module of the utility model;

[0021] Figure 8 This is a specific circuit diagram of the liquid crystal display module of the utility model;

[0022] Fig. 9 This is a specific circuit diagram of the serial communication module of the utility model;

[0023] Fig.10 This is the specific circuit diagram of the temperature and humidity detection module of the utility model; DETAILED DESCRIPTION

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] See also Figure 1 , which is a schematic diagram of the overall structure of the utility model. It includes a withstand voltage insulation test module 1, a ground resistance test module 2, a LORA wireless communication module 3, a main controller module 4, an OLED display module 5, a serial communication module 6, and a temperature and humidity detection module 7.

[0026] See also Figure 2 The main controller module 4 is a 32-bit ARM processor, whose model is GD32F373CBT6. It has the characteristics of high performance and low power consumption. It has rich internal functions and powerful communication capabilities. It supports multiple communication interfaces and can transmit data with other devices at high speed and reliably. It processes and analyzes data by controlling external modules.

[0027] The working process of the utility model is: the user inputs the test parameters through the interface, and the main controller sends instructions to control the withstand voltage test circuit and the ground resistance test circuit to start working according to the parameters input by the user. During the test, the main controller monitors the output of the test circuit in real time, collects voltage, current, and time data, and then calculates the ground resistance value based on the collected data to determine whether a breakdown occurs. Finally, the test results are sent to the staff's mobile phone or computer through the LORA wireless communication module, and displayed on the OLED display at the same time.

[0028] See also Figure 3 , is a schematic diagram of a boost circuit in the withstand voltage insulation test module 1 of this embodiment. The boost circuit includes a transformer and a relay. After the voltage of the transformer is stabilized, it is switched into the logic operation circuit through the relay.

[0029] See also Figure 4 , is a schematic diagram of the logic operation circuit in the withstand voltage insulation test module 1 of this embodiment. The logic operation circuit is composed of four OP07 operational amplifiers and their external circuits. After being connected to the AC or DC withstand voltage, the OP07 plays the role of signal amplification and voltage following.

[0030] See also Figure 5 , is a circuit schematic diagram of the ground resistance test module 2 of this embodiment. The ground resistance test module 2 includes a precision current transformer and a precision voltage transformer. The precision current transformer is used to provide a current for the logic operation circuit. The precision voltage transformer is used to provide a voltage for the logic operation circuit.

[0031] See also Figure 6 The logic operation circuit of the grounding resistance includes four OP07 operational amplifiers and peripheral circuits. OP07 plays the role of signal amplification and voltage following. The grounding resistance is calculated by the grounding resistance test circuit and compared with the preset safety standard to determine whether it is qualified.

[0032] See also Figure 7 , which is a circuit schematic diagram of the LORA wireless communication module 3 of this embodiment. The LORA wireless communication module 3 has the characteristics of strong anti-interference ability, long transmission distance and low power consumption, and is used to transmit the data collected by the tester to the computer or mobile phone of the staff in real time.

[0033] See also Figure 8 , is the circuit schematic diagram of the liquid crystal display module 5 of this embodiment. Liquid crystal display module 5, the core of the liquid crystal display module is an OLED display screen. There are four pins on the screen: power supply, ground wire and two IIC communication data lines SDA and SCL. The display screen has high resolution and good display effect, and is used to observe whether the test data is normal.

[0034] See also Fig. 9 , is a circuit schematic diagram of the serial communication module 7 of this embodiment. The serial communication module 7, the chip includes NS18121, MAX232, MAX232 is used to convert the logic level into the positive and negative voltages required by the RS-232 standard, so that the controller can communicate with the device compatible with the RS-232 standard.

[0035] See also Fig.10 , is the circuit schematic diagram of the temperature and humidity detection module of the utility model. Pin 2 of the temperature and humidity sensor module directly outputs temperature and humidity information to the monitoring node controller module using a single bus protocol. The model of the temperature and humidity sensor is DHT11.

[0036] The above-mentioned embodiments are only used to illustrate the working principle and function of the present invention, and do not limit the present invention.

Claims

1. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer, characterized by It includes a main controller module, a withstand voltage insulation test module, a ground resistance test module, a temperature and humidity detection module, a LORA wireless communication module, a serial communication module and an OLED display module. The withstand voltage insulation test module, the ground resistance test module, the temperature and humidity sensor module, the LORA wireless communication module, the serial communication module and the OLED display module are respectively connected to the main controller module.

2. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The main controller module is a high-performance 32-bit ARM processor, model GD32F373CBT6, which has built-in 256K bytes of Flash memory and 32K bytes of SRAM, and has a wide range of enhanced I / O ports, each of which can be set as an external interrupt input pin.

3. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The withstand voltage insulation test module comprises a boost circuit module and a logic operation module. The boost circuit module comprises a transformer and a relay, and the logic operation module comprises four OP07 operational amplifiers.

4. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The ground resistance test module includes a precision voltage transformer, a precision current transformer, and four OP07 chips.

5. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The sending module and receiving module of the LORA wireless communication module are composed of the MW1268 radio frequency chip and its peripheral circuits.

6. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The OLED display module is an OLED display screen, and various parameter values ​​are displayed in real time on the OLED display screen through IIC communication.

7. A safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The serial communication module includes NS18121 and MAX232 chips. MAX232 is used to convert the logic level into the positive and negative voltages required by the RS-232 standard, so that the controller can communicate with devices compatible with the RS-232 standard.

8. The safety tester based on LORA wireless communication and GD32 single-chip microcomputer according to claim 1, characterized in that: The temperature and humidity detection module is composed of a DHT11 temperature and humidity sensor and its peripheral circuits.

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