A mine-used four-way explosion-proof and intrinsic safety type direct-current power supply with communication function

Abstract

The application discloses a mine-used four-way explosion-proof and intrinsic safety type direct-current power supply with a communication function, which comprises five non-intrinsically safe AC_DC modules and DC intrinsic safety circuits connected with the non-intrinsically safe AC_DC modules, and is recorded as non-intrinsically safe AC_DC module 0-non-intrinsically safe AC_DC module 4. The non-intrinsically safe AC_DC module 0 is responsible for power supply of a power management module. Two power supplies of the non-intrinsically safe AC_DC module 1 and the non-intrinsically safe AC_DC module 2 are converged through the power management module to form a double-path power supply A. Two power supplies of the non-intrinsically safe AC_DC module 3 and the non-intrinsically safe AC_DC module 4 are converged through the power management module to form a double-path power supply B. The double-path power supply A is fused with a CAN bus and a vehicle-mounted Ethernet unit into an 8-core composite cable. The double-path power supply B is fused with another CAN bus and the vehicle-mounted Ethernet unit into an 8-core composite cable. The power supply internally adopts a four-way power supply parallel mode, can realize power supply with a larger power, has a higher power conversion efficiency, has a lower heat generation, and improves the safety of the power supply system.

Description

Technical Field

[0001] This invention belongs to the field of mining power supply technology, and specifically relates to a four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function. Background Technology

[0002] With the advancement of intelligent coal mine construction, information exchange at fully mechanized mining faces is becoming increasingly frequent. This involves video surveillance, various sensors, and hydraulic support controllers, among other related equipment. However, this presents challenges such as numerous connection lines for these information exchange devices and insufficient existing power supply, hindering installation and maintenance at the working face. Currently, the intrinsically safe power supply modules have power limitations; a single module cannot meet the power requirements. Therefore, it is necessary to adjust the relatively independent power supply system architecture of each subsystem at the fully mechanized mining face, and design a system that integrates multiple power sources to provide greater power to the equipment. The existing power and communication cables are numerous, and the bandwidth of the field equipment is saturated, requiring further optimization. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mining four-channel explosion-proof and intrinsically safe DC power supply with communication function, which adopts a four-way parallel power supply method, can achieve higher power supply, higher energy conversion efficiency, lower heat generation, and improve the safety of the power supply system.

[0004] The objective of this invention is achieved through the following technical solution: a mining four-channel explosion-proof and intrinsically safe DC power supply with communication function, comprising a power management module, a switching power supply module and an 8-pin connector. The switching power supply module is used to convert the input 127V AC power into 12V DC power. The input terminal is connected to the AC127V connector, and the output terminal is converged to the power management module. The switching power supply module includes five non-safe AC_DC modules and DC intrinsically safe circuits connected to the non-safe AC_DC modules respectively. The five non-safe AC_DC modules are referred to as non-safe AC_DC module 0 to non-safe AC_DC module 4.

[0005] The non-safe AC_DC module 0 is an independent power supply module. Its input is connected to the AC127 connector, and its output is connected to the power management module, which is responsible for powering the power management module. The inputs of the two power supplies, non-safe AC_DC module 1 and non-safe AC_DC module 2, are connected to the AC127 connector, and their outputs are connected to the power management module. They are then converged through the power management module to form dual power supply A. The inputs of the two power supplies, non-safe AC_DC module 3 and non-safe AC_DC module 4, are connected to the AC127 connector, and their outputs are connected to the power management module. They are then converged through the power management module to form dual power supply B. Dual power supply A, along with one CAN bus and the vehicle Ethernet unit, are converged into an 8-core connector to form an 8-core composite cable. Dual power supply B, along with another CAN bus and the vehicle Ethernet unit, are converged into another 8-core connector to form an 8-core composite cable.

[0006] The power management module includes a core processing controller, a power access module connected to the core processing controller, a wireless communication module, a CAN bus and an in-vehicle Ethernet unit, an environmental monitoring unit, and four power monitoring units. The power monitoring units are respectively connected to the output terminals of the four power supplies of non-safe AC_DC module 1 to non-safe AC_DC module 4, and are used to monitor the power load.

[0007] The power input module connects to the power output of the non-safe AC_DC module 0, converting the 12V output voltage of the non-safe AC_DC module 0 into a 3.3V voltage, which powers the core processing controller and the power monitoring unit respectively; the dual-channel power aggregation module aggregates the two parallel channels together, and then aggregates them together with the CAN bus and the vehicle Ethernet unit to the 8-core connector, forming an 8-core composite cable.

[0008] The core processing controller uses the GD32F303CBT6 chip.

[0009] The power input module includes two identical power conversion circuits, each comprising a TPS54302D synchronous buck converter and an AMS1117 voltage regulator. Pin 1 of the synchronous buck converter is grounded, and pin 3 is connected to the 12V input voltage via two diodes D1 and D2 and a resistor R1. Two capacitors C2 and C3 are connected in parallel to pin 3, with the other ends of capacitors C2 and C3 grounded. A resistor R3 is connected between pin 3 and pin 5, and pin 5 is also grounded via a resistor R6. Pin 6 of the synchronous buck converter is connected to one end of an inductor L1 via a capacitor C1, and the other end of inductor L1... The inductor L1 is connected to pin 3 of the voltage regulator; the end of the inductor L1 connected to capacitor C1 is connected to pin 2 of the synchronous buck converter; pin 4 of the synchronous buck converter is connected to ground after resistor R4; pin 4 of the synchronous buck converter is connected to pin 3 of the voltage regulator after resistors R5 and R2 in sequence; capacitor C9 is connected in parallel across the two ends of resistor R5; two capacitors C4 and C5 are also connected in parallel across the end of inductor L1 connected to the voltage regulator; the other ends of capacitors C4 and C5 are grounded; pin 1 of the voltage regulator is grounded; pin 2 is the output pin; capacitor C6 is connected between pin 1 and pin 3; capacitors C7 and C8 are connected in parallel across pin 2 and pin 3.

[0010] The power monitoring unit uses the INA226AIDGSR chip; pins 1 (A1) and 2 (A0) of the INA226AIDGSR chip are address pins, both of which are digital inputs, and the status of pins A0 and A1 is sampled on the bus communication; pin 3 (Alert) is reserved.

[0011] Pin 4 (SDA) and pin 5 (SCL) are the serial data line interface and serial clock line interface, respectively, and are connected to the core processing controller. The bus generates the serial clock SCL, which controls bus access and generates start and stop conditions for the master device. During addressing, when SCL is high, the master starts the condition by pulling the data signal line SDA from a high logic level to a low logic level. During data transmission, SDA must remain stable while SCL is high. Any change in SDA while SCL is high is interpreted as a start or stop condition. After all data has been transmitted, the master generates a stop condition, indicated by pulling SDA from low to high when SCL is high.

[0012] The INA226AIDGSR chip has pin 6 (VS+) connected to a 3.3V power supply; pin 7 (GND) grounded; pin 8 (VBUS) a bus voltage analog input; pin 9 (VIN-) an analog input port connected to the load side of the shunt resistor; and pin 10 (VIN+) an analog input port connected to the power supply side of the shunt resistor. By monitoring the voltage drop across the shunt resistor and the bus power supply voltage, the power load power can be obtained.

[0013] An isolation module is provided between the power monitoring unit and the core processing controller. The isolation module uses the ADUM1250ARZ-RL7 chip. Pins 1 and 8 of the isolation module are connected to a 3.3V power supply, pins 4 and 5 are grounded, pins 6 and 7 are connected to the SDA and SCL interfaces of the core processing controller after being connected to a resistor, and pins 2 and 3 are connected to the SDA and SCL interfaces of the power monitoring chip after being connected to a resistor.

[0014] The output terminals of the four power supplies of the non-safe AC_DC modules 1 to 4 are all connected to electronic switches. The electronic switches include IRF9310TRPBF field-effect transistors and KPS2801 0CTLD optocoupler-optotransistor outputs. Pin 1 of the optocoupler-optotransistor output is connected to the core processing controller, pin 2 is grounded, pin 3 is connected to pin 4 of the field-effect transistor, pin 4 is connected to the 12V voltage input, a resistor is connected across pin 3 and pin 4, and pin 3 is grounded after being connected to a resistor. Pins 1, 2, and 3 of the field-effect transistor are all connected to the 12V voltage input, and pins 5, 6, 7, and 8 are output pins.

[0015] The beneficial effects of this invention are:

[0016] 1. The power supply of the present invention adopts a four-way parallel power supply, which can achieve a higher power supply, higher energy conversion efficiency, lower heat generation, and improve the safety of the power supply system.

[0017] 2. This invention selects a device with a larger dynamic range, expanding the operating voltage range to AC 85V~265V. The operating voltage range is significantly improved, the minimum starting voltage is reduced by about 10.5% compared to before, and the overall operating voltage range is expanded by about 400% compared to before, improving the starting stability under extreme power supply conditions.

[0018] 3. This power supply integrates the power supply lines of multiple power sources, CAN bus, and vehicle Ethernet communication cables into one, which can significantly reduce the number of external interfaces and cables, and reduce the difficulty of installation and debugging. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the four-channel explosion-proof and intrinsically safe DC power supply for mining according to the present invention;

[0020] Figure 2 This is a schematic diagram of the power management module structure of the present invention;

[0021] Figure 3 This is the circuit diagram of the power access module in the power management module;

[0022] Figure 4 This is a circuit diagram of the core processing controller in the power management module.

[0023] Figure 5 This is the circuit diagram of the power monitoring unit;

[0024] Figure 6 The circuit diagram is for the isolation module;

[0025] Figure 7 This is a circuit diagram for an electronic switch. Detailed Implementation

[0026] To improve power output and address the issue of large circuit dimensions, this invention employs four parallel switching power supplies. Each power supply converts 127V AC to 12V 2A DC, and then every two power supplies are combined into two power lines (12VA and 12VB) via a dual-power aggregation module. Each line integrates a CAN bus and automotive Ethernet, merging power supply and communication into a single 8-core cable, providing both high-power supply and wired signal communication. In the 8-core composite cable, two cores are allocated for the CAN bus, two for automotive Ethernet, two for 12VA, and two for 12VB. The CAN bus and automotive Ethernet are used for communication between devices, while the 12VA and 12VB are used for device power supply. The merged cable significantly reduces the number of external interfaces and cables, simplifying installation and debugging. Traditional power supplies rely heavily on analog components, resulting in large power module sizes. With advancements in electronic technology, power devices are now smaller, more efficient, and generate less heat. Power modules designed with novel components offer optimizations in size, efficiency, and reliability. Combined with multi-power integration, this approach optimizes both size and power output. The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the present invention provides a four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function, including a power management module, a switching power supply module and an 8-pin connector. The switching power supply module is used to convert the input 127V AC power into 12V DC power. The input terminal is connected to the AC127V connector, and the output terminal is connected to the power management module. The switching power supply module includes five non-safe AC_DC modules and DC intrinsically safe circuits connected to the non-safe AC_DC modules respectively. The five non-safe AC_DC modules are referred to as non-safe AC_DC module 0 to non-safe AC_DC module 4.

[0028] The power supply has 5 internal AC-DC outputs, including four external output non-safe AC_DC modules 1 to 4 and one internal monitoring output non-safe AC_DC module 0. The non-safe AC_DC module 0 is an independent power supply module. Its input is connected to the AC127 connector, and its output is connected to the power management module, which is responsible for powering the power management module. The inputs of the two power supplies (denoted as 12VA and 12VB, respectively) of the non-safe AC_DC module 1 and the non-safe AC_DC module 2 are connected to the AC127 connector, and their outputs are connected to the power management module. They are then converged through the power management module to form dual power supply A. The inputs of the two power supplies (denoted as 12VA and 12VB, respectively) of the non-safe AC_DC module 3 and the non-safe AC_DC module 4 are connected to the AC127 connector, and their outputs are connected to the power management module. They are then converged through the power management module to form dual power supply B. Dual power supply A, along with one CAN bus and the vehicle Ethernet unit, converges to an 8-core connector to form an 8-core composite cable, which is connected to the electro-hydraulic support controller on the left, powering the electro-hydraulic support controller and exchanging data with it. Dual power supply B, along with another CAN bus and the vehicle Ethernet unit, converges to another 8-core connector to form an 8-core composite cable, which is connected to the electro-hydraulic support controller on the right.

[0029] In the 8-core composite cable, two cores are dedicated to CAN bus, automotive Ethernet, 12VA, and 12VB. The CAN bus and automotive Ethernet are used for communication between devices, while the 12VA and 12VB cores are used to power the devices. Each composite cable can provide 48W of power to the devices.

[0030] like Figure 2 As shown, the power management module includes a core processing controller, a power access module connected to the core processing controller, a wireless communication module, a CAN bus and an in-vehicle Ethernet unit, an environmental monitoring unit for temperature and humidity, and four power monitoring units. The power monitoring units are respectively connected to the output terminals of the four power supplies of non-safe AC_DC module 1 to non-safe AC_DC module 4, and are used to monitor the power load.

[0031] The power input module connects to the power output of the non-safety AC_DC module 0, converting the 12V output of the non-safety AC_DC module 0 into 3.3V, which powers the core processing controller and power monitoring unit respectively. The dual-power aggregation module combines two parallel switching power supplies, then integrates them with the CAN bus and vehicle Ethernet unit into an 8-core connector, forming an 8-core composite cable, which connects to the electro-hydraulic support controller. Simultaneously, the power management module includes 5G and WiFi wireless communication modules (other commonly used communication modules can be added as needed), enabling internal and external communication. It also integrates environmental monitoring sensors such as temperature and humidity sensors to monitor the working environment and status. Data is used to dynamically monitor the power supply's operating status, provide data assurance for normal equipment operation, provide early warnings for faults, and upload the equipment's power data wirelessly or via wired connection. The role of multiple power supplies in the system: wired transmission is primary, with wireless as a supplement.

[0032] The power input module includes two identical power conversion circuits, namely a TPS54302D synchronous buck converter and an AMS1117 voltage regulator. Figure 3 As shown; pin 1 of the synchronous buck converter is grounded, pin 3 is connected to the 12V input voltage through two diodes D1 and D2 and resistor R1, and two capacitors C2 and C3 are connected in parallel to pin 3, with the other ends of capacitors C2 and C3 grounded; resistor R3 is connected between pin 3 and pin 5, and pin 5 is also grounded through resistor R6; pin 6 of the synchronous buck converter is connected to one end of inductor L1 through capacitor C1, and the other end of inductor L1 is connected to pin 3 of the regulator; the end of inductor L1 connected to capacitor C1 is connected to the synchronous... Pin 2 of the buck converter is connected. Pin 4 of the synchronous buck converter is connected to ground after being connected to resistor R4. Pin 4 of the synchronous buck converter is connected to pin 3 of the regulator after being connected to resistors R5 and R2 in sequence. Capacitor C9 is connected in parallel across the two ends of resistor R5. One end of inductor L1 connected to the regulator is also connected in parallel with two capacitors C4 and C5. The other ends of capacitors C4 and C5 are grounded. Pin 1 of the regulator is grounded, and pin 2 is the output pin. Capacitor C6 is connected between pin 1 and pin 3, and capacitors C7 and C8 are connected in parallel between pin 2 and pin 3.

[0033] The core processing controller uses the GD32F303CBT6 chip, and the specific circuit is as follows: Figure 4As shown. It primarily performs control functions such as UART, SPI, I2C, and GPIO communication; the power monitoring unit monitors and manages current and voltage; the temperature and humidity monitoring unit detects changes in circuit temperature and humidity; the wireless communication module transmits and receives wireless signals; and the CAN and Ethernet modules transmit wired signals. Pins 10 and 11 are the interface for pins 4 (SDA) and 5 (SCL) of the first power monitoring unit; pins 32 and 33 are the interface for pins 4 (SDA) and 5 (SCL) of the second power monitoring unit; pins 18 and 19 are the interface for pins 4 (SDA) and 5 (SCL) of the third power monitoring unit; and pins 42 and 43 are the interface for pins 4 (SDA) and 5 (SCL) of the fourth power monitoring unit. Pins 25 to 28 are the control signal output pins for the four-channel electronic switches.

[0034] The power monitoring unit uses the INA226AIDGSR chip. By monitoring the voltage drop across the shunt resistor and the bus power supply voltage, combined with programmable calibration values, conversion time, averaging functions, and an internal multiplier, it can directly read current and power values. Its circuitry is as follows: Figure 5 As shown (taking the circuit diagram of the third power monitoring unit as an example). Pins 1 (A1) and 2 (A0) of the INA226AIDGSR chip are address pins, both of which are digital inputs. The core processing controller samples the state of pins A0 and A1 through the bus; pin 3 (Alert) is reserved.

[0035] Pin 4 (SDA) and pin 5 (SCL) are the serial data line interface and the serial clock line interface, respectively, and are connected to the core processing controller. In this embodiment, they are connected to pins 18 and 19 of the GD32F303CBT6 chip, respectively. During addressing, when SCL is high, the core processing controller initiates the condition by pulling the data signal line SDA from a high logic level to a low logic level. During data transmission, SDA must remain stable while SCL is high. Any change in SDA while SCL is high is interpreted as an initiation or deactivation condition. After all data has been transmitted, the core processing controller generates a deactivation condition by pulling SDA from low to high when SCL is high.

[0036] Pin 6 (VS+) of the INA226AIDGSR chip is connected to a 3.3V power supply; pin 7 (GND) is grounded; pin 8 (VBUS) is the analog bus voltage input; pin 9 (VIN-) is the analog input port, connected to the load side of shunt resistor R26; pin 10 (VIN+) is the analog input port, connected to the power supply side of shunt resistor R26.

[0037] The INA226AIDGSR chip measures the power bus voltage U; the shunt current I is generated by the load circuit flowing through the shunt resistor R26 and monitored on the VIN+ and VIN- pins; then the power is calculated.

[0038] P = UI.

[0039] The INA226AIDGSR chip contains modules such as a voltage register, calibration register, accumulator, and output register. It stores the shunt voltage generated by the load circuit flowing through the shunt resistor R26 in the voltage register. To calculate the shunt current I, the value of the shunt voltage in the voltage register is multiplied by the calibration value provided by the calibration register and then divided by 2048. The calibration register provides the calibration value for the shunt resistor used to generate the measured differential voltage. Multiple measurements of the shunt voltage are taken, and the resulting shunt current I is stored in the accumulator each time until the set number of measurements is reached. The average value of the measured shunt current I is then calculated and multiplied by the power bus voltage to obtain the power. After the calculation, the current and power results are placed in the output register for direct reading.

[0040] Low-voltage startup technology for power modules: The original power module's operating voltage range was AC 95V~140V. Actual calculations showed that with 160 controllers operating on a 4 square millimeter cable, a large voltage drop occurred at the line end, with the AC voltage falling close to the 95V low-voltage limit. This caused repeated power protection activation during heavy-load startup. This invention selects components with a wider dynamic range, expanding the operating voltage range to AC 85V~265V, reducing the low-voltage limit, and improving startup stability under extreme conditions through intelligent control of the startup load.

[0041] Dynamic power monitoring technology: The power monitoring and control technology utilizes the INA226AIDGSR chip. The core processor is the GD32F303CBT6 chip, primarily employing a power detection chip as the core, communicating and controlling with the MCU via a low-speed communication protocol. The collected data is analyzed. When the monitored load starts up and detects that the load power exceeds 7.2W, the load is disconnected, waiting for the AC-DC module of the switching power supply to operate normally before reconnecting the load, ensuring the normal operation of the downstream load and thus the overall system. When an overload is detected in the downstream stage, the AC-DC module of the switching power supply can be directly disconnected, thus protecting the module and providing dual short-circuit protection. A CAN bus and automotive Ethernet are integrated into the power management module for communication.

[0042] An isolation module is provided between the power monitoring unit and the core processing controller. The isolation module uses the ADUM1250ARZ-RL7 chip. Figure 6As shown. Pins 1 and 8 of the isolation module are connected to the 3.3V power supply, pins 4 and 5 are grounded, pins 6 and 7 are connected to resistors (R18 and R24) respectively and then connected to the SDA and SCL interfaces of the core processing controller, and pins 2 and 3 are connected to resistors (R17 and R23) respectively and then connected to the SDA and SCL interfaces of the power monitoring chip.

[0043] The output terminals of the four power supplies of non-safe AC-DC modules 1 to 4 are all connected to electronic switches. These electronic switches include IRF9310TRPBF field-effect transistors and KPS2801 0CTLD optocoupler-optotransistor outputs, such as... Figure 7 As shown. Pin 1 of the optocoupler-optotransistor output is connected to the core processing controller, pin 2 is grounded, pin 3 is connected to pin 4 of the field-effect transistor, pin 4 is connected to the 12V voltage input, a resistor R41 is connected across pins 3 and 4, and pin 3 is connected to ground via a resistor R42. Pins 1, 2, and 3 of the field-effect transistor are all connected to the 12V voltage input (i.e., the output ports of each power supply), and pins 5, 6, 7, and 8 are output pins. When the power supply load is too high, or when the temperature and humidity sensor detects abnormal data, the core processor sends a control signal to control the electronic switch to disconnect, ensuring circuit safety.

[0044] The power supply operation process of this invention is as follows:

[0045] 1. The power supply circuit powers on the power source;

[0046] 2. Power Function Initialization: Perform the following initialization steps in sequence: core processing controller initialization, clock initialization, interrupt initialization, internal bus initialization, variable initialization, peripheral device initialization, and communication initialization.

[0047] 3. The power management module determines whether an interrupt task has been received. If an interrupt task is received, it will be processed first; otherwise, step 4 will be executed.

[0048] 4. The power management module checks whether a timed task has been received. If a timed task flag is detected, the timed task is processed; otherwise, step 5 is executed.

[0049] 5. Sensor processing tasks: The temperature and humidity sensor collects ambient temperature and humidity data and transmits the collected temperature and humidity data to the core processor. The core processor performs Kalman filtering and then determines whether the collected data is abnormal (exceeding the preset normal range). If the value collected by the sensor is abnormal, a sensor abnormality flag is thrown.

[0050] 6. Perform power monitoring tasks: Collect current and voltage data and transmit them to the core processor. After data Kalman filtering, calculate the power. If the power is greater than 7.2W, give an abnormal flag indicating that the power supply is out of limit, and leave it for abnormal handling.

[0051] 7. Execute communication tasks, handling both wired and wireless communication. For receiving tasks, simultaneously receive wired and wireless signals, determine signal flags, and if both are received simultaneously, process the wired signal first, then the wireless signal; otherwise, process the first received signal, or, if priorities are set, process the higher-priority signal first. When signal processing is complete and transmission is required, transmit simultaneously via both wired and wireless methods.

[0052] 8. If there is an abnormal signal, handle the abnormal signal. If there is an abnormality as described in step 5 or step 6, disconnect the electronic switch in the corresponding circuit of the 127V connector. Then repeat steps 3-8.

[0053] The data in steps 5 and 6 exhibit significant instantaneous fluctuations. To ensure that the measured values ​​are close to the true values ​​and to further guarantee the safe and stable operation of the power supply, the data collected by the environmental sensors and the data from the power monitoring module are filtered. Since the data is one-dimensional, Kalman filtering can be used to ensure real-time and stable operation.

[0054] Assuming the value of the data at time k in steps 5 and 6 is x(k), the data processing flow in steps 5 and 6 is as follows:

[0055] (1) Initialize X(k-1|k-1), P(k-1|k-1), Q and R;

[0056] (2) State prediction: X(k|k-1)=AX(k-1|k-1);

[0057] (3) Error covariance matrix prediction: P(k|k-1)=AP(k-1|k-1)A T +Q;

[0058] (4) Calculate the Kalman gain K: K(k) = P(k|k-1)H T / (HP(k|k-1)H T +R);

[0059] (5) Update the predicted state: X(k|k)=X(k|k-1)+K(k)(Z(k)-HX(k|k-1));

[0060] (6) Update error covariance: P(k|k)=(1-K(k)H)P(k|k-1);

[0061] (7) k = k + 1, repeat (2) - (7).

[0062] Where X(k-1|k-1) is the optimal estimate of the data at the previous time step, P(k-1|k-1) is the covariance matrix between the estimated value and the true value, Q is the covariance matrix of the process noise, and R is the covariance matrix of the observation error, reflecting the measurement accuracy of the measured value; both process noise and measurement noise follow a normal distribution. The data processed in this invention are all one-dimensional data, so A = [1] and H = [1]. X(k|k) is the data value obtained at time k.

[0063] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function, characterized in that, It includes a power management module, a switching power supply module, and an 8-pin connector. The switching power supply module is used to convert the input 127V AC power into 12V DC power. The input terminal is connected to the AC127V connector, and the output terminal is connected to the power management module. The switching power supply module includes five non-safe AC_DC modules and DC intrinsically safe circuits connected to the non-safe AC_DC modules respectively. The five non-safe AC_DC modules are referred to as non-safe AC_DC module 0 to non-safe AC_DC module 4. The non-safe AC_DC module 0 is an independent power supply module. Its input is connected to the AC127 connector, and its output is connected to the power management module, which is responsible for powering the power management module. The inputs of the two power supplies, non-safe AC_DC module 1 and non-safe AC_DC module 2, are connected to the AC127 connector, and their outputs are connected to the power management module. They are then converged through the power management module to form dual power supply A. The inputs of the two power supplies, non-safe AC_DC module 3 and non-safe AC_DC module 4, are connected to the AC127 connector, and their outputs are connected to the power management module. They are then converged through the power management module to form dual power supply B. Dual power supply A, along with one CAN bus and one vehicle Ethernet unit, are converged into an 8-core connector to form an 8-core composite cable. Dual power supply B, along with another CAN bus and another vehicle Ethernet unit, are converged into another 8-core connector to form an 8-core composite cable. The power management module includes a core processing controller, a power access module connected to the core processing controller, a wireless communication module, a CAN bus and an in-vehicle Ethernet unit, an environmental monitoring unit, and four power monitoring units. The power monitoring units are respectively connected to the output terminals of the four power supplies of non-safe AC_DC module 1 to non-safe AC_DC module 4, and are used to monitor the power load. The power input module connects to the power output of the non-safe AC_DC module 0, converting the 12V output voltage of the non-safe AC_DC module 0 into a 3.3V voltage, which powers the core processing controller and the power monitoring unit respectively; the dual power aggregation module aggregates the two parallel power supplies together, and then aggregates them together with the CAN bus and the vehicle Ethernet unit to the 8-core connector, forming an 8-core composite cable. The power input module includes two identical power conversion circuits, each comprising a TPS54302D synchronous buck converter and an AMS1117 voltage regulator. Pin 1 of the synchronous buck converter is grounded, and pin 3 is connected to the 12V input voltage via two diodes D1 and D2 and a resistor R1. Two capacitors C2 and C3 are connected in parallel to pin 3, with the other ends of capacitors C2 and C3 grounded. A resistor R3 is connected between pin 3 and pin 5, and pin 5 is also grounded via a resistor R6. Pin 6 of the synchronous buck converter is connected to one end of an inductor L1 via a capacitor C1, and the other end of inductor L1... The inductor L1 is connected to pin 3 of the voltage regulator; the end of the inductor L1 connected to capacitor C1 is connected to pin 2 of the synchronous buck converter; pin 4 of the synchronous buck converter is connected to ground after resistor R4; pin 4 of the synchronous buck converter is connected to pin 3 of the voltage regulator after resistors R5 and R2 in sequence; capacitor C9 is connected in parallel across the two ends of resistor R5; two capacitors C4 and C5 are also connected in parallel across the end of inductor L1 connected to the voltage regulator; the other ends of capacitors C4 and C5 are grounded; pin 1 of the voltage regulator is grounded; pin 2 is the output pin; capacitor C6 is connected between pin 1 and pin 3; capacitors C7 and C8 are connected in parallel across pin 2 and pin 3.

2. The four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function according to claim 1, characterized in that, The core processing controller uses the GD32F303CBT6 chip.

3. A four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function as described in claim 1, characterized in that, The power monitoring unit uses the INA226AIDGSR chip; pins 1 (A1) and 2 (A0) of the INA226AIDGSR chip are address pins, both of which are digital inputs, and the status of pins A0 and A1 is sampled on the bus communication; pin 3 (Alert) is reserved. Pin 4 SDA and pin 5 SCL are the serial data line interface and the serial clock line interface, respectively, which are connected to the core processing controller. The bus generates a serial clock SCL, which controls bus access and generates start and stop conditions for master device control. During addressing, when SCL is high, the master initiates the condition by pulling the data signal line SDA from a high logic level to a low logic level. During data transmission, SDA must remain stable while SCL is high. Any change in SDA while SCL is high is interpreted as a start or stop condition. After all data has been transmitted, the master generates a stop condition, indicated by pulling SDA from low to high while SCL is high. Pin 6 (VS+) of the INA226AIDGSR chip is connected to a 3.3V power supply; pin 7 (GND) is grounded; pin 8 (VBUS) is the analog bus voltage input; pin 9 (VIN-) is the analog input port and is connected to the load side of the shunt resistor. Pin 10, VIN+, is the analog input port, connected to the power supply of the shunt resistor; The power load power is obtained by monitoring the voltage drop across the shunt resistor and the bus power supply voltage.

4. A four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function as described in claim 3, characterized in that, An isolation module is provided between the power monitoring unit and the core processing controller. The isolation module uses the ADUM1250ARZ-RL7 chip. Pins 1 and 8 of the isolation module are connected to a 3.3V power supply, pins 4 and 5 are grounded, pins 6 and 7 are connected to the SDA and SCL interfaces of the core processing controller after being connected to a resistor, and pins 2 and 3 are connected to the SDA and SCL interfaces of the power monitoring chip after being connected to a resistor.

5. A four-channel explosion-proof and intrinsically safe DC power supply for mining with communication function as described in claim 1, characterized in that, The output terminals of the four power supplies of the non-safe AC_DC modules 1 to 4 are all connected to electronic switches. The electronic switches include IRF9310TRPBF field-effect transistors and KPS2801 0CTLD optocoupler-optotransistor outputs. Pin 1 of the optocoupler-optotransistor output is connected to the core processing controller, pin 2 is grounded, pin 3 is connected to pin 4 of the field-effect transistor, pin 4 is connected to the 12V voltage input, a resistor is connected across pin 3 and pin 4, and pin 3 is grounded after being connected to a resistor. Pins 1, 2, and 3 of the field-effect transistor are all connected to the 12V voltage input, and pins 5, 6, 7, and 8 are output pins.

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