An isolated separate type mining solenoid valve driver

Abstract

The present invention discloses an isolated separate type mining solenoid valve driver, including an MCU main control chip, a power monitoring unit, a DCDC step-down unit, an SKK24 connector, an isolated RS485 unit, an LED status indication unit, multiple SPI low-side switch units, a 2.54mm double-row pin, a 2.54mm double-row socket and an XH socket; the MCU main control chip is respectively connected to the power monitoring unit, the DCDC step-down unit, the isolated RS485 unit, the LED status indication unit and multiple SPI low-side switch units, the SPI low-side switch unit is connected to the 2.54mm double-row pin, the 2.54mm double-row pin is plugged into the 2.54mm double-row socket, and the 2.54mm double-row socket is connected to the XH socket; the SKK24 connector is respectively connected to the isolated RS485 unit and the power monitoring unit, and the power monitoring unit is connected to the DCDC step-down unit. The MCU control board of the present invention and the interface board use 2.54mm double-row pins and sockets for plugging, and the XH-3A connector on the interface board is plugged into the drive line. When you need to replace the drive cable, you can directly replace the cable that is plugged into the XH. It has a simple structure and is easy to use.

Description

Technical Field

[0001] The invention relates to an isolated and separated electromagnetic valve driver for mining. Background Art

[0002] With the development of intelligent mining work faces, more and more intelligent equipment is being used, resulting in more complex systems and greater susceptibility to interference between various devices. This necessitates the development of a driver with strong interference resistance and stable signal transmission. The small drive wires connecting the driver to the solenoid valves are very susceptible to damage during operation. Existing drivers on the market all use an integrated design, making replacement of the small drive wires during maintenance very difficult. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the prior art by providing an isolated, separate mining solenoid valve driver that uses 2.54mm double-row pins and sockets for interfacing between the MCU control board and the interface board, and an XH-3A connector on the interface board for interfacing with the driver cable. When the driver cable needs to be replaced, the cable plugged into the XH can be directly replaced, resulting in simple maintenance and ease of use.

[0004] The objective of the present invention is achieved through the following technical solutions: an isolated separate mining solenoid valve driver, comprising an MCU main control chip, a power monitoring unit, a DCDC step-down unit, an SKK24 connector, an isolated RS485 unit, an LED status indication unit, multiple SPI low-side switch units, a 2.54mm double-row pin, a 2.54mm double-row socket and an XH socket; the MCU main control chip is respectively connected to the power monitoring unit, the DCDC step-down unit, the isolated RS485 unit, the LED status indication unit and the multiple SPI low-side switch units, the SPI low-side switch unit is connected to the 2.54mm double-row pin, the 2.54mm double-row pin is plugged into the 2.54mm double-row socket, the 2.54mm double-row socket is connected to the XH socket, and the XH socket is plugged into the XH-3A connector on the solenoid valve interface board through a driving wire; the SKK24 connector is respectively connected to the isolated RS485 unit and the power monitoring unit, and the power monitoring unit is connected to the DCDC step-down unit.

[0005] The MCU main control chip adopts GD32F303CCT6, the MCU main control chip uses an 8MHz external crystal oscillator, and communicates with the SPI low-side switch unit using the SPI bus.

[0006] The isolated RS485 unit uses TDA51S485HC as the interface chip, wherein pin 1 of the interface chip is connected to the 3.3V voltage input terminal, pin 2 is grounded, capacitors C18 and C19 are connected in parallel between pins 1 and 2, pin 3 is connected in series with resistor R51 and then connected to the PB11 / USART2_RX signal terminal of the MCU main control chip, pins 4 and 5 are connected to the PA11 signal terminal of the MCU main control chip, pin 6 is connected in series with resistor R52 and then connected to the PB10 / USAT2_TX signal terminal of the MCU main control chip, pins 7, 8, 9 and 10 are all grounded, pin 12 is connected in series with resistor R60 and then connected to the RS485B1 signal line, pin 13 is connected in series with resistor R59 and then connected to the RS485A1 signal line, pin 15 is grounded, pin 16 is connected to the isolated power supply VISO1 port, and capacitors C20 and C21 are connected in parallel between pins 15 and 16;

[0007] A diode D7 and a resistor R55 are connected in parallel between the resistor R59 and the RS485A1 signal line, and the other ends of the diode D7 and the resistor R55 are grounded. A diode D8 is connected in parallel between the resistor R60 and the RS485B1 signal line, and the other end of the diode D8 is grounded. A resistor R53 is connected across the RS485A1 signal line and the RS485B1 signal line. The RS485A1 signal line is also connected to the isolated power supply VISO1 port through the resistor R50.

[0008] The DCDC step-down unit uses the DCDC step-down chip RY8411 from RYCHIP. Pin 5 of the RY8411 is connected to the 12V input voltage, and pin 4 is connected in series with a resistor R22 and then to the 12V input voltage. Capacitors C9 and C10 are connected in parallel at the input interface of the 12V input voltage, and the other ends of the capacitors C9 and C10 are grounded.

[0009] Capacitor C5 is connected between pin 1 and pin 6 of RY8411, and pin 6 is connected in series with inductor L1 and resistor R15 to output a 3.3V voltage; pin 2 of RY8411 is grounded; pin 3 of RY8411 is connected to one end of resistor R19 and capacitor C6 respectively, and the other end of resistor R19 and capacitor C6 is connected between inductor L1 and resistor R15, and the end of resistor R19 connected to pin 3 is connected in series with resistor R23 and then grounded; capacitors C7 and C8 are connected in parallel between inductor L1 and resistor R15, and the other ends of capacitors C7 and C8 are grounded; resistors R20 and R24 are connected between inductor L1 and resistor R15, and resistors R20 and R24 are connected in series, and the other end of resistor R20 is connected between inductor L1 and resistor R15, and the other end of R24 is grounded. The series interface of resistors R20 and R24 is connected to the PA2 signal terminal of the MUC main control chip.

[0010] The power monitoring unit consists of a P-channel MOSFET AO3401A and an NPN transistor S8050LT1 to form a switching circuit. The PB0 signal of the MCU main control chip controls the on-off of the 12VDC signal of the solenoid valve, and the MAX4372TEUK+T chip is used as a detection amplifier.

[0011] The source of the P-channel MOSFET is connected to the 12VDC signal, the drain is connected to pin 4 of the current detection amplifier, a diode D4 is connected between the source and drain, and the gate is connected to the collector of the NPN transistor; the emitter of the NPN transistor is grounded, the base is connected to the PB0 signal of the MCU main control chip through resistor R9, the collector is connected to the 12VDC signal through resistor R7, and a resistor R11 is connected between the base and emitter;

[0012] Resistor R2 is connected across pins 4 and 5 of the detection amplifier. Resistor R2 and the detection amplifier form a 12VDC loop current monitoring circuit. R2 is a current detection resistor. The detection amplifier amplifies the voltage signal on R2 and sends it to the MCU main control chip through pin 2.

[0013] The SPI low-side switch unit is implemented using an integrated low-side switch MC33879. Pin 1 of the MC33879 is grounded, pin 2 is connected to 3.3VDD input, and pins 3, 6, 10, and 13 are all grounded; pin 5 is connected to DCF8, pin 7 is connected to DCF2, pin 11 is connected to DCF1, pin 12 is connected to DCF6, pin 14 is connected in series with a resistor R4 and then grounded, pin 15 is connected in series with a resistor R6 and then connected to VCC3.3V input, and pin 16 is connected to SP10_SCK. Pin 17 is connected to SP10_MOSI, pin 18 is connected to the PB15 signal of the MCU main control chip, pin 19 is connected in series with resistor R5 and then grounded, pins 20, 23, 27, and 29 are all grounded, pin 21 is connected to DCF15, pin 22 is connected to DCF3, pin 26 is connected to DCF4, pin 28 is connected to DCF7, pin 31 outputs 12V voltage, pin 32 is connected to SP10_MOSI; pin 33 is connected to 3.3VDD input through capacitor C1, and pin 33 is also grounded.

[0014] The LED status indicator unit includes four parallel-connected light-emitting diodes D39, D40, D41, and D42, and all four diodes are connected to the 3.3VDD input; diode D39 is a red LED light, which is connected in series with resistor D35 and then grounded; diode D40 is an emerald green LED light, which is connected in series with resistor R37 and then connected to the PB6 signal of the MCU main control chip; diode D41 is an emerald green diode, which is connected in series with resistor R44 and then connected to the PB5 signal of the MCU main control chip; diode D42 is a red diode, which is connected in series with resistor R45 and then connected to the PB3 signal of the MCU main control chip.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention uses isolated RS485 for communication. The isolated RS485 unit uses TDA51S485HC as the interface chip, which has high electromagnetic immunity and low radiation characteristics, and has high insulation capacity; it can prevent noise and surges on the data bus or other circuits from entering the local ground terminal, thereby interfering with or damaging sensitive circuits; it can withstand up to 6kV (HBM) and ±15kV (contact discharge); it has efficient isolated power supply and overload and short-circuit protection capabilities;

[0017] 2. The MCU control board and the interface board use 2.54mm double-row pins and sockets for interfacing. The XH-3A connector on the interface board is plugged into the driver cable. When the driver cable needs to be replaced, the cable plugged into the XH can be directly replaced. The overall design of the product is simple and beautiful, and maintenance and replacement are simple, making the solenoid valve driver more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a module diagram of the isolated, separate, mining-use solenoid valve driver of the present invention;

[0019] Figure 2 This is a connection diagram of the isolated separation type mining solenoid valve driver system of the present invention;

[0020] Figure 3 This is the point diagram of the SKK24 connector;

[0021] Figure 4 This is the circuit diagram of the MCU main control chip;

[0022] Figure 5 This is the circuit diagram of the isolated RS485 unit;

[0023] Figure 6 This is the circuit diagram of the DCDC step-down unit;

[0024] Figure 7 This is the circuit diagram of the power monitoring unit;

[0025] Figure 8 This is the circuit diagram of the SPI low-side switch unit;

[0026] Figure 9 This is the circuit diagram of the LED status indication unit;

[0027] Figure 10 This is a circuit diagram of a double-row pin and socket. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings.

[0029] like Figure 1As shown, an isolated separate mining solenoid valve driver of the present invention includes an MCU main control chip, a power monitoring unit, a DCDC step-down unit, an SKK24 connector, an isolated RS485 unit, an LED status indication unit, multiple SPI low-side switch units, a 2.54mm double-row pin, a 2.54mm double-row socket and an XH socket; the MCU main control chip is respectively connected to the power monitoring unit, the DCDC step-down unit, the isolated RS485 unit, the LED status indication unit and multiple SPI low-side switch units, the SPI low-side switch unit is connected to the 2.54mm double-row pin, the 2.54mm double-row pin is plugged into the 2.54mm double-row socket, the 2.54mm double-row socket is connected to the XH socket, and the XH socket is plugged into the XH-3A connector on the solenoid valve interface board through a driving line; the SKK24 connector is respectively connected to the isolated RS485 unit and the power monitoring unit, the power monitoring unit is connected to the DCDC step-down unit, and the communication interface connector of the solenoid valve driver and the bracket controller uses a 4-core socket SKK24 connector. Its system structure is as shown Figure 2 As shown; SKK24 connector points are as follows Figure 3 As shown, the interface codes are X1 and X2.

[0030] The MCU main control chip mainly completes the functions of serial communication, voltage and current signal monitoring, SPI communication, LED control, etc. The MCU main control chip of the present invention adopts GD32F303CCT6, which is based on -M4 processor 32-bit general-purpose microcontroller, its circuit is as follows Figure 4 The processor includes three AHB buses, namely I-CODE bus, D-Code bus and system bus. The processor is a 32-bit processor with low interrupt latency and low-cost debugging features. High integration and enhanced features make The -M4 processor is suitable for markets requiring high-performance and low-power microcontrollers. It includes 256KB of on-chip FLASH and 48KB of SRAM. It features interfaces such as USART, SPI, ADC, and GPIO to meet application requirements. The MCU uses an 8MHz external crystal oscillator and includes an SWD debug interface (J4) and a USART communication interface (J3). Communication with the SPI low-side switch unit is accomplished via the SPI bus. The remaining peripheral pull-up and pull-down resistors and filter capacitors on the MCU utilize conventional connection methods and are not detailed here.

[0031] The isolated RS485 unit uses the TDA51S485HC (U9) as the interface chip, which has high electromagnetic immunity and low radiation characteristics, and has high insulation capacity. It can prevent noise and surges on the data bus or other circuits from entering the local ground terminal, thereby interfering with or damaging sensitive circuits. It can withstand up to 6kV (HBM) and ±15kV (contact discharge). It has efficient isolated power supply and overload and short-circuit protection capabilities, and the isolation withstand voltage is up to 5000Vrms. Its circuit is as follows Figure 5 As shown, pin 1 of the interface chip is connected to the 3.3V voltage input terminal, pin 2 is grounded, capacitors C18 (10uF) and C19 (100nF) are connected in parallel between pins 1 and 2, pin 3 is connected in series with resistor R51 (22Ω) and then connected to the PB11 / USART2_RX signal terminal of the MCU main control chip, pins 4 and 5 are connected to the PA11 signal terminal of the MCU main control chip, pin 6 is connected in series with resistor R52 (22Ω) and then connected to the PB10 / USAT2_TX signal terminal of the MCU main control chip, pins 7, 8, 9 and 10 are all grounded, pin 12 is connected in series with resistor R60 (22Ω) and then connected to the RS485B1 signal line, pin 13 is connected in series with resistor R59 (22Ω) and then connected to the RS485A1 signal line, pin 15 is grounded, pin 16 is connected to the isolated power supply VISO1 port, and capacitors C20 (100nF) and C21 (10uF) are connected in parallel between pins 15 and 16;

[0032] A diode D7 (SMAJ12CA / TR13) and a resistor R55 (1KΩ) are connected in parallel between resistor R59 and the RS485A1 signal line, and the other ends of diode D7 and resistor R55 are grounded. A diode D8 (SMAJ12CA / TR13) is connected in parallel between resistor R60 and the RS485B1 signal line, and the other end of diode D8 is grounded. A resistor R53 (120Ω) is connected across the RS485A1 signal line and the RS485B1 signal line. The RS485A1 signal line is also connected to the isolated power supply VISO1 port through resistor R50.

[0033] The external power input voltage is 12V, and the internal MCU and other unit circuits operate at 3.3V. After comprehensively evaluating the voltage, power consumption, and efficiency of each chip module on the board, the DCDC buck unit uses the RYCHIP company's DCDC buck chip RY8411 (U5); the chip has an input voltage range of 4-38V and a switching frequency of 800KHz. The DCDC power supply circuit is as follows: Figure 6 As shown. Pin 5 of RY8411 is connected to 12V input voltage, and pin 4 is connected to 12V input voltage after connecting resistor R22 (100KΩ) in series. Capacitors C9 (10uF) and C10 (100nF) are connected in parallel to the input interface of 12V input voltage, and the other ends of capacitors C9 and C10 are grounded.

[0034] Connect capacitor C5 (100nF) between pins 1 and 6 of the RY8411. Connect inductor L1 (MWSA0603S-6R8MT) and resistor R15 in series with pin 6 to output a 3.3V voltage. Connect pin 2 of the RY8411 to ground. Connect pin 3 of the RY8411 to resistor R19 (150KΩ) and one end of capacitor C6 (82pF) respectively. The other ends of resistor R19 and capacitor C6 are connected between inductor L1 and resistor R15. Connect resistor R19 in series with the end connected to pin 3. 23 is grounded; capacitors C7 (22uF) and C8 (22uF) are connected in parallel between the inductor L1 and the resistor R15, and the other ends of the capacitors C7 and C8 are grounded; resistors R20 (10KΩ) and R24 (100KΩ) are connected between the inductor L1 and the resistor R15, and the resistors R20 and R24 are connected in series, and the other end of the resistor R20 is connected between the inductor L1 and the resistor R15, and the other end of R24 is grounded, and the series interface of the resistors R20 and R24 is connected to the PA2 signal end of the MUC main control chip.

[0035] The output voltage is set by feedback resistors R19 and R23: VFB=0.8V, and VOUT=0.8*(150+47) / 47≈3.35V.

[0036] The power inductor value is calculated by the formula

[0037] The power monitoring unit is composed of a P-channel MOSFET AO3401A (Q1) and an NPN transistor S8050LT1 (Q2) to form a switch circuit. The PB0 signal of the MCU main control chip controls the on / off of the 12VDC signal of the solenoid valve. The MAX4372TEUK+T chip (U2) is used as a detection amplifier. The circuit is as follows: Figure 7 shown.

[0038] The source of the P-channel MOSFET is connected to the 12VDC signal, the drain is connected to pin 4 of the current detection amplifier, a diode D4 (IN4007) is connected between the source and drain, and the gate is connected to the collector of the NPN transistor; the emitter of the NPN transistor is grounded, the base is connected to the PB0 signal of the MCU main control chip through resistor R9 (1KΩ), the collector is connected to the 12VDC signal through resistor R7 (100KΩ), and a resistor R11 (10KΩ) is connected between the base and emitter;

[0039] Resistor R2 (200mΩ) is connected across pins 4 and 5 of the detection amplifier. Resistor R2 and the detection amplifier form a 12VDC loop current monitoring circuit. R2 is a current detection resistor. The detection amplifier amplifies the voltage signal on R2 and sends it to the MCU main control chip (PA3 signal) through pin 2; pins 3 and 4 of the detection amplifier are also grounded through capacitor C3 (100nF), and pin 1 of the detection amplifier is grounded; pin 2 is connected to resistor R13 (22Ω) and outputs the PA3 signal to the MCU main control chip. The other end of resistor R13 is connected in parallel to resistor R14 (20kΩ) and diode D3 (BZT52C5V1), and the other ends of resistor R14 and diode D3 are grounded. Pin 5 of the detection amplifier is connected to the 12V VOUT signal through resistor R3. Resistor R8 (33KΩ) and capacitor C2 (10uF) are connected in parallel between resistor R3 and pin 5. The other end of capacitor C2 is grounded. The other end of resistor R8 is connected in series with resistor R10 (10KΩ) and then grounded. The series connection port of resistors R8 and R10 is connected to the PA4 signal of the MCU main control chip. The two ends of resistor R10 are connected in parallel with diode D5 (BZT52C5V1).

[0040] The SPI low-side switch unit is implemented using an integrated low-side switch MC33879 (U1). The MC33879 has an 8-way output low-side switch that can simultaneously control the on / off of 8 solenoid valves. It uses a serial peripheral interface (SPI) for 16-bit serial input control and has short-circuit detection and load open-circuit detection current disable functions. The circuit is as follows: Figure 8 As shown. Pin 1 of the MC33879 is grounded, pin 2 is connected to 3.3VDD input, and pins 3, 6, 10, and 13 are all grounded; pin 5 is connected to DCF8, pin 7 is connected to DCF2, pin 11 is connected to DCF1, pin 12 is connected to DCF6, pin 14 is connected to ground via resistor R4, pin 15 is connected to VCC 3.3V input via resistor R6, pin 16 is connected to SP10_SCK, pin 17 is connected to SP10_MOSI, pin 18 is connected to the PB15 signal of the MCU main control chip, pin 19 is connected to ground via resistor R5, pins 20, 23, 27, and 29 are all grounded, pin 21 is connected to DCF15, pin 22 is connected to DCF3, pin 26 is connected to DCF4, pin 28 is connected to DCF7, pin 31 outputs 12V voltage, and pin 32 is connected to SP10_MOSI; pin 33 is connected to 3.3VDD input via capacitor C1 (100nF) and is also grounded.

[0041] The LED status indicator unit includes four parallel-connected light-emitting diodes D39, D40, D41, and D42. The circuit is as follows: Figure 9As shown in the figure, all four diodes are connected to the 3.3VDD input. Diode D39 is a red LED, connected in series with resistor D35 and then to ground. Diode D40 is an emerald green LED, connected in series with resistor R37 and then connected to the MCU's main control chip's PB6 signal. Diode D41 is an emerald green diode, connected in series with resistor R44 and then connected to the MCU's main control chip's PB5 signal. Diode D42 is a red diode, connected in series with resistor R45 and then connected to the MCU's main control chip's PB3 signal. A constant yellow light indicates normal power supply operation. A flashing green light indicates the driver is communicating or controlling the solenoid valve, respectively. A flashing red light indicates a driver malfunction.

[0042] In order to facilitate maintenance, 2.54mm double-row pins (J1) and sockets (J2) are used between the MCU control board and the interface board. The XH-3A connector on the interface board is plugged into the drive line. When the drive line needs to be replaced, the cable plugged into the XH can be directly replaced, which is simple and practical for maintenance and replacement. Interface circuit as shown Figure 10 shown.

[0043] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and such variations and combinations are still within the scope of protection of the present invention.

Claims

1. An isolated and separated mining solenoid valve driver, characterized in that: It includes an MCU main control chip, a power monitoring unit, a DCDC step-down unit, an SKK24 connector, an isolated RS485 unit, an LED status indicator unit, multiple SPI low-side switch units, a 2.54mm double-row pin, a 2.54mm double-row socket and an XH socket; the MCU main control chip is respectively connected to the power monitoring unit, the DCDC step-down unit, the isolated RS485 unit, the LED status indicator unit and multiple SPI low-side switch units, the SPI low-side switch unit is connected to the 2.54mm double-row pin, the 2.54mm double-row pin is plugged into the 2.54mm double-row socket, the 2.54mm double-row socket is connected to the XH socket, and the XH socket is plugged into the XH-3A connector on the solenoid valve interface board through a small drive line; the SKK24 connector is respectively connected to the isolated RS485 unit and the power monitoring unit, and the power monitoring unit is connected to the DCDC step-down unit; The isolated RS485 unit uses TDA51S485HC as the interface chip, wherein pin 1 of the interface chip is connected to the 3.3V voltage input terminal, pin 2 is grounded, capacitors C18 and C19 are connected in parallel between pins 1 and 2, pin 3 is connected in series with resistor R51 and then connected to the PB11 / USART2_RX signal terminal of the MCU main control chip, pins 4 and 5 are connected to the PA11 signal terminal of the MCU main control chip, pin 6 is connected in series with resistor R52 and then connected to the PB10 / USAT2_TX signal terminal of the MCU main control chip, pins 7, 8, 9 and 10 are all grounded, pin 12 is connected in series with resistor R60 and then connected to the RS485B1 signal line, pin 13 is connected in series with resistor R59 and then connected to the RS485A1 signal line, pin 15 is grounded, pin 16 is connected to the isolated power supply VISO1 port, and capacitors C20 and C21 are connected in parallel between pins 15 and 16; A diode D7 and a resistor R55 are connected in parallel between the resistor R59 and the RS485A1 signal line, and the other ends of the diode D7 and the resistor R55 are grounded. A diode D8 is connected in parallel between the resistor R60 and the RS485B1 signal line, and the other end of the diode D8 is grounded. A resistor R53 is connected across the RS485A1 signal line and the RS485B1 signal line. The RS485A1 signal line is also connected to the isolated power supply VISO1 port through the resistor R50. The power monitoring unit consists of a P-channel MOSFET AO3401A and an NPN transistor S8050LT1 to form a switching circuit. The PB0 signal of the MCU main control chip controls the on-off of the 12VDC signal of the solenoid valve, and the MAX4372TEUK+T chip is used as a detection amplifier. The source of the P-channel MOSFET is connected to the 12VDC signal, the drain is connected to pin 4 of the current detection amplifier, a diode D4 is connected between the source and drain, and the gate is connected to the collector of the NPN transistor; the emitter of the NPN transistor is grounded, the base is connected to the PB0 signal of the MCU main control chip through resistor R9, the collector is connected to the 12VDC signal through resistor R7, and a resistor R11 is connected between the base and emitter; Resistor R2 is connected across pins 4 and 5 of the detection amplifier. Resistor R2 and the detection amplifier form a 12VDC loop current monitoring circuit. R2 is a current detection resistor. The detection amplifier amplifies the voltage signal on R2 and sends it to the MCU main control chip through pin 2.

2. The isolated separate type mining solenoid valve driver according to claim 1, characterized in that: The MCU main control chip adopts GD32F303CCT6, the MCU main control chip uses an 8MHz external crystal oscillator, and communicates with the SPI low-side switch unit using the SPI bus.

3. The isolated and separated mining solenoid valve driver according to claim 1, characterized in that: The DCDC step-down unit uses the DCDC step-down chip RY8411 from RYCHIP. Pin 5 of the RY8411 is connected to the 12V input voltage, and pin 4 is connected in series with a resistor R22 and then to the 12V input voltage. Capacitors C9 and C10 are connected in parallel at the input interface of the 12V input voltage, and the other ends of the capacitors C9 and C10 are grounded. Capacitor C5 is connected between pin 1 and pin 6 of RY8411, and pin 6 is connected in series with inductor L1 and resistor R15 to output a 3.3V voltage; pin 2 of RY8411 is grounded; pin 3 of RY8411 is connected to one end of resistor R19 and capacitor C6 respectively, and the other end of resistor R19 and capacitor C6 is connected between inductor L1 and resistor R15, and the end of resistor R19 connected to pin 3 is connected in series with resistor R23 and then grounded; capacitors C7 and C8 are connected in parallel between inductor L1 and resistor R15, and the other ends of capacitors C7 and C8 are grounded; resistors R20 and R24 are connected between inductor L1 and resistor R15, and resistors R20 and R24 are connected in series, and the other end of resistor R20 is connected between inductor L1 and resistor R15, and the other end of R24 is grounded. The series interface of resistors R20 and R24 is connected to the PA2 signal terminal of the MUC main control chip.

4. The isolated and separated mining solenoid valve driver according to claim 1, characterized in that: The SPI low-side switch unit is implemented using an integrated low-side switch MC33879. Pin 1 of the MC33879 is grounded, pin 2 is connected to 3.3VDD input, and pins 3, 6, 10, and 13 are all grounded; pin 5 is connected to DCF8, pin 7 is connected to DCF2, pin 11 is connected to DCF1, pin 12 is connected to DCF6, pin 14 is connected in series with a resistor R4 and then grounded, pin 15 is connected in series with a resistor R6 and then connected to VCC3.3V input, and pin 16 is connected to SP10_SCK. Pin 17 is connected to SP10_MOSI, pin 18 is connected to the PB15 signal of the MCU main control chip, pin 19 is connected in series with resistor R5 and then grounded, pins 20, 23, 27, and 29 are all grounded, pin 21 is connected to DCF15, pin 22 is connected to DCF3, pin 26 is connected to DCF4, pin 28 is connected to DCF7, pin 31 outputs 12V voltage, pin 32 is connected to SP10_MOSI; pin 33 is connected to 3.3VDD input through capacitor C1, and pin 33 is also grounded.

5. The isolated and separated mining solenoid valve driver according to claim 1, characterized in that: The LED status indicator unit includes four parallel-connected light-emitting diodes D39, D40, D41, and D42, and all four diodes are connected to the 3.3VDD input; diode D39 is a red LED light, which is connected in series with resistor D35 and then grounded; diode D40 is an emerald green LED light, which is connected in series with resistor R37 and then connected to the PB6 signal of the MCU main control chip; diode D41 is an emerald green diode, which is connected in series with resistor R44 and then connected to the PB5 signal of the MCU main control chip; diode D42 is a red diode, which is connected in series with resistor R45 and then connected to the PB3 signal of the MCU main control chip.

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