Automatic detection device for mining intrinsic safety power supply

Abstract

The utility model discloses a mining intrinsic safety power supply automatic detection device which comprises a power supply, a voltage regulation unit, an adjustable load unit, a current detection unit, a voltage detection unit and a core control unit, the power supply is connected with the voltage regulation unit, the voltage regulation unit is connected with the core control unit, and the core control unit is connected with the adjustable load unit. The adjustable load unit is connected with the current detection unit, and the adjustable load unit and the current detection unit are respectively connected with the core control unit; the voltage detection unit comprises a power supply voltage detection unit, an adjusted voltage detection unit and an output voltage detection unit. According to the utility model, the power supply, the voltage adjusting unit, the adjustable load unit, the current detection unit, the voltage detection unit and the core control unit are combined together to form the mining intrinsic safety power supply automatic detection device. Automatic detection of parameters such as an overvoltage protection value, a maximum output current value, an output voltage deviation value, a protection time interval and the like of the tested intrinsic safety power supply is realized, and a function of recovering waveform display is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply detection, and in particular relates to an automatic detection device for intrinsically safe power supply for mines. Background Art

[0002] With the gradual advancement of intelligent and digital coal mines, the use of underground monitoring, surveillance, communication, and control equipment is increasing. Due to the presence of explosive gases underground in coal mines, all electrical equipment must meet explosion-proof requirements. However, explosion-proof equipment is heavy, bulky, and costly. In contrast, intrinsically safe equipment is widely used due to its compact size, ease of use, and improved safety. Consequently, the demand for intrinsically safe power supplies for use with these devices is increasing. The stability of intrinsically safe power supplies directly impacts the reliable and reliable operation of these devices, potentially impacting overall mine safety and posing a threat to the lives and property of workers. To ensure the stability, reliability, and safety of intrinsically safe power supplies, each unit and each circuit must undergo rigorous factory testing for key indicators, including intrinsic safety parameters, to ensure that all indicators meet design requirements, guaranteeing both safety and performance.

[0003] Before an intrinsically safe power supply leaves the factory, parameters that require testing include: overvoltage protection value, maximum output current value, output voltage deviation value, protection time interval, and recovery process. Conventional factory testing is cumbersome, inefficient, and produces inconsistent results. Because intrinsically safe power supplies are analog circuits, the parameters that need to be measured are all dynamic limit values. This requires that during routine factory testing, inspectors must slowly adjust power supply and load conditions while carefully reading instrument values, sometimes requiring multiple measurements. Consequently, high standards are placed on the accuracy and response speed of instrumentation, as well as the quality of the inspectors. Existing digital meters offer high accuracy but slow refresh rates. While pointer meters are responsive, their pointers immediately return to zero when protection is triggered, making it difficult to capture their maximum value. Furthermore, pointer meter readings require calculations, leading to inconsistent readings from different inspectors.

[0004] In summary, analysis of conventional testing solutions reveals the following issues: The entire process requires human involvement, manual operation of existing digital instruments, and a high level of concentration. Furthermore, the testing steps are cumbersome, and successful completion cannot always be guaranteed. Therefore, to address these issues, it is necessary to develop an automatic test device for intrinsically safe power supplies used in mines. Utility Model Content

[0005] The utility model aims to solve the above problems and make up for the deficiencies of the existing technology by providing an automatic detection device for mining intrinsically safe power supplies which can automatically control voltage and load, realize automatic detection of parameters such as overvoltage protection value, maximum output current value, output voltage deviation value, protection time interval, etc. of the intrinsically safe power supply under test, and has the function of restoring waveform display.

[0006] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0007] The utility model provides a mine-used intrinsically safe power automatic detection device, comprising a power supply, a voltage regulating unit, an adjustable load unit, a current detection unit, a voltage detection unit and a core control unit, wherein the power supply is connected to the voltage regulating unit, the voltage regulating unit is connected to the core control unit, the adjustable load unit is connected to the current detection unit, and the adjustable load unit and the current detection unit are respectively connected to the core control unit;

[0008] The voltage detection unit includes a supply voltage detection unit, a regulated voltage detection unit, and an output voltage detection unit. The supply voltage detection unit is connected to the power supply, the voltage regulation unit, and the core control unit respectively. The supply voltage detection unit is used to detect the output voltage of the power supply;

[0009] The regulated voltage detection unit is connected to the voltage regulating unit and the core control unit respectively. The regulated voltage detection unit is used to detect the output voltage adjusted by the voltage regulating unit. The voltage regulating unit and the regulated voltage detection unit are both used to be connected to the input terminal of the intrinsically safe power supply under test.

[0010] The output voltage detection unit is connected to the adjustable load unit and the core control unit respectively. The output voltage detection unit is used to detect the output voltage of the intrinsically safe power supply under test. The adjustable load unit, the current detection unit and the output voltage detection unit are all used to be connected to the output end of the intrinsically safe power supply under test.

[0011] Furthermore, the voltage regulating unit includes a switching power supply circuit and an isolation circuit. The power supply is connected to the switching power supply circuit, the switching power supply circuit is connected to the isolation circuit, and both the switching power supply circuit and the isolation circuit are connected to the core control unit.

[0012] Furthermore, the power supply voltage detection unit, the adjusted voltage detection unit, and the output voltage detection unit are all composed of a combined resistor voltage divider circuit. The combined resistor voltage divider circuit constituting the power supply voltage detection unit is used to collect the output voltage of the power supply and transmit it to the core control unit. The combined resistor voltage divider circuit constituting the adjusted voltage detection unit is used to collect the output voltage adjusted by the voltage adjustment unit and transmit it to the core control unit. The combined resistor voltage divider circuit constituting the output voltage detection unit is used to collect the output voltage of the intrinsically safe power supply under test and transmit it to the core control unit.

[0013] Furthermore, the adjustable load unit adopts an electronic adjustable load circuit, which includes an insulated gate bipolar transistor device, an intermediate coupling circuit, and a push-pull amplifier circuit. The insulated gate bipolar transistor device is connected to the push-pull amplifier circuit through the intermediate coupling circuit, the insulated gate bipolar transistor device is connected to the current detection unit, and the push-pull amplifier circuit is connected to the core control unit.

[0014] Furthermore, the current detection unit adopts a current acquisition circuit with an analog-to-digital conversion chip as the core, which is used to collect the current signal generated by the tested intrinsically safe power supply with an adjustable load unit and transmit it to the core control unit.

[0015] Furthermore, the automatic detection device for intrinsically safe power supply for mining is also provided with a protection switching unit, which is connected to the core control unit and adopts a single-pole double-throw relay circuit; the single-pole double-throw relay circuit is used to be connected to the input positive terminal, output positive terminal and intermediate voltage MID output terminal of the intrinsically safe power supply under test respectively, to switch the double protection of the intrinsically safe power supply under test.

[0016] Furthermore, the mine-used intrinsically safe power supply automatic detection device also includes a display unit and a communication unit, and the display unit and the communication unit are respectively connected to the core control unit.

[0017] Furthermore, the core control unit adopts a single chip microcomputer.

[0018] Furthermore, the communication unit adopts an RS485 transceiver circuit, and the core control unit is connected to the host computer via the RS485 transceiver circuit.

[0019] Furthermore, the display unit adopts a liquid crystal display screen.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] By combining the power supply, voltage regulation unit, adjustable load unit, current detection unit, voltage detection unit and core control unit, the utility model forms a mine-use intrinsically safe power supply automatic detection device, which can automatically control the voltage and load, realize automatic detection of parameters such as the overvoltage protection value, maximum output current value, output voltage deviation value, protection time interval of the tested intrinsically safe power supply, and has the function of restoring waveform display. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a structural schematic block diagram of an automatic detection device for intrinsically safe power supply for mines.

[0023] Figure 2The utility model is a circuit diagram of an automatic detection device for intrinsically safe power supply for mines. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Reference Figure 1 and Figure 2 The embodiment of the present utility model provides an automatic detection device for intrinsically safe power supply for mining, including a power supply, a voltage regulating unit, an adjustable load unit, a current detection unit, a voltage detection unit and a core control unit; the power supply is connected to the voltage regulating unit, the voltage regulating unit is connected to the core control unit, the adjustable load unit is connected to the current detection unit, and the adjustable load unit and the current detection unit are respectively connected to the core control unit; the voltage detection unit includes a power supply voltage detection unit, an adjusted voltage detection unit, and an output voltage detection unit, and the power supply voltage detection unit is respectively connected to the power supply, the voltage regulating unit, and the core control unit, and the power supply voltage detection unit is used to detect the output of the power supply. The output voltage is also the input voltage of the voltage regulating unit; the adjusted voltage detection unit is connected to the voltage regulating unit and the core control unit respectively, and the adjusted voltage detection unit is used to detect the output voltage adjusted by the voltage regulating unit, and this output voltage is also the input voltage of the intrinsically safe power supply under test. The voltage regulating unit and the adjusted voltage detection unit are both used to be connected to the input end of the intrinsically safe power supply under test; the output voltage detection unit is connected to the adjustable load unit and the core control unit respectively, and the output voltage detection unit is used to detect the output voltage of the intrinsically safe power supply. The adjustable load unit, the current detection unit and the output voltage detection unit are all used to be connected to the output end of the intrinsically safe power supply under test.

[0026] Specifically, the core control unit adopts a single-chip microcomputer, which is used to control the voltage regulation unit to adjust the input voltage of the intrinsically safe power supply under test, control the adjustable load unit to continuously adjust the output current of the intrinsically safe power supply under test, and control the protection switching unit to adjust the switching of the protection level of the intrinsically safe power supply under test. The core control unit realizes the overall control of the working process of the automatic detection device of the intrinsically safe power supply for mining, so as to achieve the purpose of automatically detecting various parameters of the intrinsically safe power supply under test; at the same time, the working parameters of each working point in the detection process are collected and transmitted to the core control unit through the current detection unit and the voltage detection unit.

[0027] like Figure 1 and Figure 2As shown, the voltage regulating unit includes a switching power supply circuit and an isolation circuit. The power supply is connected to the switching power supply circuit, and the switching power supply circuit is connected to the isolation circuit. The switching power supply circuit and the isolation circuit are both connected to the core control unit. The purpose of setting the voltage regulating unit in the utility model is to be able to detect the maximum input voltage of the intrinsically safe power supply under test, that is, the overvoltage protection value of the intrinsically safe power supply under test. The core component of the switching power supply circuit of the voltage regulating unit is the switching power supply chip U1. The model selected for the switching power supply chip U1 is LM2596-ADJ. By changing the 4-pin voltage of the switching power supply chip U1, the closed-loop adjustment of the 2-pin output voltage of the switching power supply chip U1 is achieved.

[0028] like Figure 1 and Figure 2 As shown, the circuit elements connected to the periphery of the switching power supply chip U1 include a diode D3, a fuse F1, a Zener diode D2, a thyristor Q2, a resistor R1, a resistor R5, a resistor R12, a resistor R16, a transistor Q6, a diode D1, a capacitor C2, and an inductor L1. Since the maximum input voltage of the switching power supply chip U1 is 45V, an overvoltage protection circuit is designed to prevent the input voltage of the switching power supply chip U1 from being too high and causing damage to the switching power supply chip U1. The overvoltage protection circuit is composed of a Zener diode D2, a thyristor Q2, and a fuse F1. The Zener diode D2 is a 30V Zener diode. When the input voltage is higher than 30V, the thyristor Q2 is turned on and the fuse F1 is blown to protect the subsequent circuit. At the same time, in order to prevent the polarity between the power supply and the switching power supply circuit from being reversed, the power supply is connected to the overvoltage protection circuit through a diode D3, and the diode D3 realizes the anti-reverse connection function; the 1-pin and 5-pin of the switching power supply chip U1 are connected to the IO1 port of the core control unit through a resistor R12, a transistor Q6, and a resistor R16, and a capacitor C1 is also connected after the inductor L1 connected to the output end of the 2-pin of the switching power supply chip U1, and the voltage regulation unit is connected to the input positive terminal and the input negative terminal of the intrinsically safe power supply under test through the capacitor C1.

[0029] like Figure 1 and Figure 2As shown, the isolation circuit provided can improve the circuit safety of the voltage regulation unit. The isolation circuit is composed of a photocoupler U3, which isolates the high-end control signal of the 4-pin of the switching power supply chip U1. Resistors R13, R8, and R4 are connected between the photocoupler U3 and pins 4 and 2 of the switching power supply chip U1. Resistors R13, R8, and R4 are connected in sequence. Resistors R4 are connected to inductor L1. Resistors R18, transistors Q5, Q7, filter capacitor C5, and resistor R17 are connected between the photocoupler U3 and the PWM1 port of the core control unit. A variable DC voltage can be formed after filtering by filter capacitor C5. The combination of transistors Q5 and Q7 can increase the driving capability, thereby improving the reliability and stability of the voltage regulation unit.

[0030] like Figure 1 and Figure 2 As shown, the supply voltage detection unit, the adjusted voltage detection unit, and the output voltage detection unit are all composed of a combined resistor voltage divider circuit. The combined resistor voltage divider circuit constituting the supply voltage detection unit is used to collect the output voltage of the power supply and transmit it to the core control unit; specifically, the combined resistor voltage divider circuit constituting the supply voltage detection unit is composed of a resistor R21 and a resistor R24 ​​connected together, and this combined resistor voltage divider circuit is connected to the analog-to-digital conversion ADC3 port of the core control unit; the combined resistor voltage divider circuit constituting the adjusted voltage detection unit is used to collect the output voltage adjusted by the voltage adjustment unit and transmit it to the core control unit, specifically, the combined resistor voltage divider circuit constituting the adjusted voltage detection unit is composed of a resistor R22 and a resistor R25 connected together, and this combined resistor voltage divider circuit is connected to the analog-to-digital conversion ADC2 port of the core control unit; the combined resistor voltage divider circuit constituting the output voltage detection unit is used to collect the output voltage of the intrinsically safe power supply under test and transmit it to the core control unit, specifically, the combined resistor voltage divider circuit constituting the output voltage detection unit is composed of a resistor R23 and a resistor R26 connected together, and this combined resistor voltage divider circuit is connected to the analog-to-digital conversion ADC1 port of the core control unit. Among them, the purpose of collecting and detecting the output voltage of the power supply is to identify the voltage level of the intrinsically safe power supply under test through the power supply voltage range, and preset the corresponding standard parameters to determine whether it is qualified; the purpose of collecting and detecting the output voltage adjusted by the voltage regulation unit is to measure the overvoltage protection value of the intrinsically safe power supply under test in combination with the voltage regulation unit; the purpose of collecting and detecting the output voltage of the intrinsically safe power supply under test is to calculate the output voltage deviation value after full load in combination with the input voltage of the intrinsically safe power supply under test.

[0031] like Figure 1 and Figure 2As shown, the adjustable load unit adopts an electronic adjustable load circuit, which includes an insulated gate bipolar transistor device, an intermediate coupling circuit, and a push-pull amplifier circuit. The insulated gate bipolar transistor device is connected to the push-pull amplifier circuit through the intermediate coupling circuit, the insulated gate bipolar transistor device is connected to the current detection unit, and the push-pull amplifier circuit is connected to the core control unit; wherein the insulated gate bipolar transistor device serves as an adjustable electronic load. The core control unit controls the adjustable load unit to change the output current of the intrinsically safe power supply under test. The purpose of automatic adjustment can be achieved by connecting the adopted electronic adjustable load circuit with the core control unit. The PWM pulse width modulation signal is output through the PWM3 port of the core control unit. The PWM pulse width modulation signal is filtered by the resistor R7 and the filter capacitor C3 and then input into the push-pull amplifier circuit composed of the transistor Q1 and the transistor Q3, and then drives the intermediate coupling circuit. The intermediate coupling circuit is composed of the photoelectric coupler U2. The resistors R9 and R10 are connected between the 2nd and 3rd pins of the photoelectric coupler U2. The resistors R6 and R2 are connected to the 3rd and 4th pins of the photoelectric coupler U2 respectively. The collector of the photoelectric coupler U2 is connected to the output positive terminal of the intrinsically safe power supply under test through the resistor R3. The voltage V between the gate and the emitter of the photoelectric transistor device Q4 measured by the output of the photoelectric coupler U2 is controlled. GE , thereby controlling the collector current I of the insulated gate bipolar transistor device Q4 C , to achieve automatic load adjustment.

[0032] like Figure 1 and Figure 2 As shown, the current detection unit utilizes a current acquisition circuit centered around an analog-to-digital conversion chip to collect the output current signal generated by the intrinsically safe power supply under test with an adjustable load unit and transmit it to the core control unit. The analog-to-digital conversion chip U5, model CS1237, detects the output current of the intrinsically safe power supply under test to measure its maximum output current, i.e., its overcurrent protection value. The analog-to-digital conversion chip U5 utilizes a 2-wire SPI interface for functional parameter configuration and data output conversion. A resistor R15 is connected in series within the load circuit as a sampling resistor. The two ends of resistor R15 are connected to differential input terminals 4 and 5 of the analog-to-digital conversion chip U5, corresponding to their polarity. After amplification by the integrated amplifier within the analog-to-digital conversion chip U5, the signal is sampled and converted, ultimately transmitting the signal to the SCL and SDA ports of the microcontroller via the SPI bus. Furthermore, a capacitor C4 is connected between pins 3 and 8 of the analog-to-digital conversion chip U5, and a resistor R14 is connected between pins 8 and 9 of the analog-to-digital conversion chip U5. Pins 4 and 5 of the differential input terminal of the analog-to-digital conversion chip U5 are respectively connected to the emitter of the insulated gate bipolar transistor device Q4 and the negative output terminal of the intrinsically safe power supply under test.

[0033] like Figure 1 and Figure 2 As shown, the mine-used intrinsically safe power automatic detection device is also provided with a protection switching unit, which is connected to the core control unit and adopts a single-pole double-throw relay circuit; the single-pole double-throw relay circuit is used to connect to the input positive terminal, output positive terminal and intermediate voltage MID output terminal of the intrinsically safe power supply under test, respectively, to switch the dual protection of the intrinsically safe power supply under test. Specifically, the single-pole double-throw relay circuit is composed of a single-pole double-throw relay K1, a resistor R19, a transistor Q8, and a diode D4. The control signal is output by the IO2 port of the single-chip microcomputer, driving the transistor Q8 and then controlling the single-pole double-throw relay K1 to achieve switching; the common point of the single-pole double-throw relay K1 is connected to the dual protection junction point, that is, the intermediate voltage MID output terminal of the intrinsically safe power supply under test, the normally open point of the single-pole double-throw relay K1 is connected to the input positive terminal of the intrinsically safe power supply under test, and the normally closed point of the single-pole double-throw relay K1 is connected to the output positive terminal of the intrinsically safe power supply under test. The action of the single-pole double-throw relay K1 will make the two protections invalid respectively and make the other protection effective, for detection by the mine intrinsically safe power supply automatic detection device.

[0034] The automatic detection device for intrinsically safe power supplies for mining also includes a display unit and a communication unit, each of which is connected to a core control unit. The core control unit uses an STC8A8K64D4 single-chip microcomputer, which serves as the core control chip to control the entire automatic detection device for intrinsically safe power supplies for mining. The IO3 port of the single-chip microcomputer is connected to a photocoupler U4, which is connected to the positive output terminal of the intrinsically safe power supply under test via a resistor R11. An external resistor R20 is also connected between the photocoupler U4 and the IO3 port of the single-chip microcomputer. Through the photocoupler U4, the output status of the intrinsically safe power supply under test can be detected.

[0035] The display unit uses a 3.5-inch IPS LCD screen as the main display component. The display unit uses its own UART interface to connect to the TXD2 and RXD2 ports of the microcontroller to display the detection data and detection results. The display unit is independently powered by a 5V power supply.

[0036] The communication unit adopts RS485 transceiver circuit, and the core control unit is connected to the host computer through the RS485 transceiver circuit; thus realizing communication between the mine intrinsically safe power automatic detection device and the host computer. Figure 1 and Figure 2As shown, the RS485 transceiver circuit consists of the RS485 transceiver chip U9 and its connected peripheral circuits. The RS485 transceiver chip U9 uses the SP3485 model and is independently powered by a 3.3V power supply. The peripheral circuits connected to the RS485 transceiver chip U9 include resistors R27, R28, R29, R30, R31, R32, R33, R34, R35, capacitor C6, diode D6, light-emitting diode D5, transistor Q9, and button S1. Pins 1 and 4 of the RS485 transceiver chip U9 are connected to the RXD1 and TXD1 ports of the microcontroller, respectively. In the receiving state, pin 4 of the RS485 transceiver chip U9 is pulled high by resistor R35, transistor Q9 is turned off, and pin 2 of the RS485 transceiver chip U9 is pulled low by resistor R30, meeting the receiving conditions and indicating normal reception. When transmitting a high level, the high level control transistor Q9 on pin 4 of the RS485 transceiver chip U9 turns off, placing the RS485 transceiver chip U9 in a receiving state. When transmitting a low level, the low level control transistor Q9 on pin 4 of the RS485 transceiver chip U9 turns on, placing pin 3 of the RS485 transceiver chip U9 at a high level, satisfying the transmission condition. Simultaneously, the low level on pin 4 of the RS485 transceiver chip U9 is converted into a negative differential signal, enabling low-level transmission. Button S1 is the start / stop button, enabling local control of the detection process. LED D5 is the detection status indicator. When the mine-use intrinsically safe power automatic detection device is in standby mode, LED D5 is off, flashes slowly during detection, remains on when the test result is qualified, and flashes rapidly when the test result is unqualified.

[0037] In summary, after receiving a command to start testing via the core control unit, the present invention controls the voltage regulation unit to adjust the input voltage of the intrinsically safe power supply under test, controls the adjustable load unit to continuously adjust the output current of the intrinsically safe power supply under test, and controls the protection switching unit to adjust the protection level of the intrinsically safe power supply under test, thereby achieving the purpose of automatically testing various parameters of the intrinsically safe power supply under test. The present invention utilizes a communication unit to communicate with a host computer, which can store and compile statistics on data; utilizes a display unit to display parameters and waveforms in real time; and utilizes a protection switching unit to switch between the two protection levels of the intrinsically safe power supply under test, enabling separate testing of each level of protection.

[0038] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Ordinary technicians in this field should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the scope of protection of the present invention.

Claims

1. A mine-used intrinsically safe power supply automatic detection device, characterized by: It includes a power supply, a voltage regulating unit, an adjustable load unit, a current detection unit, a voltage detection unit and a core control unit. The power supply is connected to the voltage regulating unit, the voltage regulating unit is connected to the core control unit, the adjustable load unit is connected to the current detection unit, and the adjustable load unit and the current detection unit are respectively connected to the core control unit; the voltage detection unit includes a supply voltage detection unit, an adjusted voltage detection unit, and an output voltage detection unit. The supply voltage detection unit is respectively connected to the power supply, the voltage regulating unit, and the core control unit. The supply voltage detection unit is used to detect the output voltage of the power supply; The adjusted voltage detection unit is connected to the voltage adjustment unit and the core control unit respectively. The adjusted voltage detection unit is used to detect the output voltage adjusted by the voltage adjustment unit. The voltage adjustment unit and the adjusted voltage detection unit are both used to be connected to the input end of the intrinsically safe power supply under test; the output voltage detection unit is connected to the adjustable load unit and the core control unit respectively. The output voltage detection unit is used to detect the output voltage of the intrinsically safe power supply under test. The adjustable load unit, the current detection unit and the output voltage detection unit are all used to be connected to the output end of the intrinsically safe power supply under test.

2. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The voltage regulating unit includes a switching power supply circuit and an isolation circuit. The power supply is connected to the switching power supply circuit, which is connected to the isolation circuit. Both the switching power supply circuit and the isolation circuit are connected to the core control unit.

3. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The supply voltage detection unit, the adjusted voltage detection unit, and the output voltage detection unit are all composed of a combined resistor voltage divider circuit. The combined resistor voltage divider circuit that constitutes the supply voltage detection unit is used to collect the output voltage of the power supply and transmit it to the core control unit. The combined resistor voltage divider circuit that constitutes the adjusted voltage detection unit is used to collect the output voltage adjusted by the voltage adjustment unit and transmit it to the core control unit. The combined resistor voltage divider circuit that constitutes the output voltage detection unit is used to collect the output voltage of the intrinsically safe power supply under test and transmit it to the core control unit.

4. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The adjustable load unit adopts an electronic adjustable load circuit, which includes an insulated gate bipolar transistor device, an intermediate coupling circuit, and a push-pull amplifier circuit. The insulated gate bipolar transistor device is connected to the push-pull amplifier circuit through the intermediate coupling circuit, the insulated gate bipolar transistor device is connected to the current detection unit, and the push-pull amplifier circuit is connected to the core control unit.

5. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The current detection unit adopts a current acquisition circuit with an analog-to-digital conversion chip as the core, which is used to collect the current signal generated by the operation of the tested intrinsically safe power supply with an adjustable load unit and transmit it to the core control unit.

6. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The automatic detection device for intrinsically safe power supply for mining is also provided with a protection switching unit, which is connected to the core control unit and adopts a single-pole double-throw relay circuit; the single-pole double-throw relay circuit is used to be respectively connected to the input positive terminal, output positive terminal and intermediate voltage MID output terminal of the intrinsically safe power supply under test, to switch the double protection of the intrinsically safe power supply under test.

7. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The mine-used intrinsically safe power supply automatic detection device further comprises a display unit and a communication unit, and the display unit and the communication unit are respectively connected to the core control unit.

8. The automatic detection device for intrinsically safe power supply for mining according to claim 1, characterized in that: The core control unit adopts a single chip microcomputer.

9. The automatic detection device for intrinsically safe power supply for mining according to claim 7, characterized in that: The display unit adopts a liquid crystal display screen.

10. The automatic detection device for intrinsically safe power supply for mining according to claim 7, characterized in that: The communication unit adopts RS485 transceiver circuit, and the core control unit is connected to the host computer through the RS485 transceiver circuit.

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