An isolated direct-current power supply voltage acquisition module

Abstract

The utility model relates to an isolated direct current power voltage acquisition module, including power unit, MCU unit, PHY unit, bottom plate unit and PORT unit, the PORT unit includes isolated direct current power voltage signal conversion circuit, and isolated direct current power voltage signal conversion circuit includes overcurrent protection circuit, voltage dividing circuit and electrical isolation circuit, and overcurrent protection circuit, voltage dividing circuit and electrical isolation circuit connect gradually, and the output end of electrical isolation circuit is connected with AD module, and electrical isolation circuit passes through AD module and connects MCU unit, the power output end of bottom plate unit connects power unit, and the power unit is the power supply and AD module power supply for MCU unit, PORT unit, PHY unit. The utility model realizes power voltage isolation collection and conversion, provides the hardware foundation for voltage value abnormal fluctuation judgement and early warning, and in addition adopts modularization design and is convenient and hardware platform system combination.

Description

Technical Field

[0001] This utility model relates to the field of DC power supply voltage acquisition and processing technology, specifically to an isolated DC power supply voltage acquisition module. Background Technology

[0002] The PDD unit (PowerSupplyVoltageDetectionUnit) is an expansion board in the hardware platform system. It is mainly used to collect the power supply voltage of equipment such as ATP (Automatic Train Protection) in high-speed trains and forward the collected data to the CPU board, realizing judgment and early warning based on the power supply voltage standard and fluctuation range.

[0003] In actual operation, due to the influence of different vehicle models' batteries and power supply systems, the power supply voltage provided by the EMU to the ATP equipment may experience abnormal fluctuations, affecting the normal operation of the ATP equipment.

[0004] Therefore, there is an urgent need for a high-precision dual-channel isolated DC power supply voltage acquisition module to monitor the ATP power supply voltage value in real time, and to provide a hardware foundation for judging and warning of abnormal voltage fluctuations according to standard requirements. Summary of the Invention

[0005] To address the problem of the inability to monitor the power supply status of existing ATP equipment in real time, this invention proposes an isolated DC power supply voltage signal conversion circuit, including an overcurrent protection circuit, a voltage divider circuit, and an electrical isolation circuit. This circuit enables isolated acquisition and conversion of power supply voltage. The AD module and MCU unit provide the hardware foundation for judging and warning of abnormal voltage fluctuations. Furthermore, the modular design facilitates integration with hardware platform systems.

[0006] To achieve the above objectives, this utility model proposes an isolated DC power supply voltage acquisition module, comprising a power supply unit, an MCU unit, a PHY unit, a baseboard unit, and a PORT unit. The PORT unit is used to acquire external DC power supply voltage signals. The output terminal of the PORT unit is connected to the MCU unit, and the MCU unit is communicatively connected to the baseboard unit. The PORT unit includes an isolated DC power supply voltage signal conversion circuit, which comprises an overcurrent protection circuit, a voltage divider circuit, and an electrical isolation circuit. The overcurrent protection circuit, voltage divider circuit, and electrical isolation circuit are connected in sequence. The output terminal of the electrical isolation circuit is connected to an AD module, and the electrical isolation circuit is connected to the MCU unit through the AD module. The power output terminal of the base plate unit is connected to the power supply unit, which provides power to the MCU unit, PORT unit, PHY unit and AD module.

[0007] The overcurrent protection circuit includes a self-resetting fuse, the voltage divider circuit includes multiple high-precision wafer resistors, and the electrical isolation circuit includes an AMC1350-Q1 chip. The self-resetting fuse has an input interface connected to one side and multiple high-precision wafer resistors connected to the other side. The multiple high-precision wafer resistors are connected in series and then connected to the AMC1350-Q1 chip. The output terminal of the AMC1350-Q1 chip is connected to the AD module. There are two isolated DC power supply voltage signal conversion circuits, forming two detection channels.

[0008] High-precision wafer resistors are designed for high impedance, ensuring the input impedance meets requirements. The AMC1350-Q1 is an isolated precision amplifier with highly EMI-resistant output and input circuitry. The AMC1350-Q1's high-impedance input is optimized for connection to high-impedance resistor dividers or other voltage signal sources with high output resistance. It features excellent accuracy and low temperature drift, supporting precise AC and DC voltage sensing, with a non-linearity of ±0.02% for high-precision isolated DC power supply voltage acquisition.

[0009] Furthermore, the AD module includes an ADS131M02 chip, which communicates with the MCU unit via an SPI serial port.

[0010] The ADS131M02 chip features a 2-channel synchronous sampling differential input, a 24-bit Δ-Σ analog-to-digital converter, a programmable data rate up to 64kSPS, and an integrated low-drift internal voltage reference. It meets the requirements for raw waveform sampling and data acquisition accuracy.

[0011] Furthermore, a communication module is provided between the MCU unit and the baseboard unit. The communication module includes a 485 bus module and a CAN bus module. The MCU unit communicates with the baseboard unit through the 485 bus module and the CAN bus module. The output terminal of the MCU unit is connected to a MOS switching circuit, which includes a MOS transistor. The output terminal of the MCU unit is connected to the gate of the MOS transistor. A slot position detection circuit is also provided between the MCU unit and the base plate unit. The slot position detection circuit is located on the base plate unit and is connected to the four GPIO pins of the MCU unit.

[0012] Furthermore, the PHY unit includes a DP83848I chip, which is connected to the MCU unit via MII serial communication. The PHY unit is connected to the base plate unit via a network bus.

[0013] Furthermore, the power supply unit includes a protection circuit, a DC12-5V isolation conversion circuit, and a DC12-3.3V conversion circuit. The protection circuit includes a resettable fuse and an LC filter circuit. The DC12V output of the base unit is connected to the resettable fuse and the LC filter circuit. The LC filter circuit is connected to the DC12-5V isolation conversion circuit and the DC12-3.3V conversion circuit, respectively. The DC12-3.3V conversion circuit includes the SY8120I chip; The DC12-5V isolation conversion circuit includes the IF1205XT-1WR3 isolation power supply chip.

[0014] After the DC12V output of the base unit is connected in series with a resettable fuse and an LC filter circuit, a current and voltage monitoring circuit is also connected. The current and voltage monitoring circuit includes an INA138 chip, which is a high-side single-unit current shunt monitor with a wide input range of 2.7-36V. It converts the differential input voltage into current output. At the same time, in order to reduce the impact of the downstream load on the monitoring circuit, the acquired signal is connected to the ADC pin of the MCU unit after passing through a first-stage emitter follower circuit.

[0015] The beneficial effects of this utility model through the above technical solution are as follows: This utility model possesses high-precision signal acquisition and processing capabilities, enabling real-time monitoring of the power supply status of ATP equipment. It incorporates two isolated DC power supply voltage signal conversion circuits, employing dual-channel isolated DC power supply voltage acquisition. An overcurrent protection circuit effectively protects the acquired circuit from interference from the acquisition circuit. A voltage divider circuit enhances the safety and reliability of the acquisition interface. An electrical isolation circuit ensures reliable electrical isolation between the input and output terminals, guaranteeing electrical safety isolation requirements. An AD module performs analog-to-digital conversion, and an MCU unit provides the hardware foundation for signal processing and transmission.

[0016] This utility model adopts a modular design for easy integration with hardware platform systems. The MCU unit integrates a CAN bus module, a 485 bus module, and a PHY unit with the baseboard unit, facilitating data interaction with external devices and system integration, thus improving module compatibility and scalability. The MCU unit, in conjunction with the PHY unit, provides the board with a 100Mbps network bus, enabling communication between the board and other units in the system. Attached Figure Description

[0017] Fig. 1 This is one of the circuit schematic diagrams of an isolated DC power supply voltage acquisition module according to this utility model; Fig. 2This is the second circuit schematic diagram of an isolated DC power supply voltage acquisition module according to this utility model.

[0018] Reference numerals: 1 for MCU unit, 2 for PORT unit, 3 for PHY unit, 4 for power supply unit, 5 for baseboard unit, 6 for isolated DC power supply voltage-to-signal conversion circuit, 601 for overcurrent protection circuit, 602 for voltage divider circuit, 603 for electrical isolation circuit, 7 for AD module, 8 for 485 bus module, 9 for CAN bus module, 10 for MOS switch circuit, 11 for DC12-5V isolation conversion circuit, 12 for DC12-3.3V conversion circuit, 13 for slot position detection circuit. Detailed Implementation

[0019] Example 1 like Figs. 1-2 As shown, an isolated DC power supply voltage acquisition module includes a power supply unit 4, an MCU unit 1, a PHY unit 3, a base plate unit 5, and a PORT unit 2. The PORT unit 2 is used to acquire external DC power supply voltage signals. The output terminal of the PORT unit 2 is connected to the MCU unit 1. The MCU unit 1 is communicatively connected to the base plate unit 5. The PORT unit 2 includes an isolated DC power supply voltage signal conversion circuit 6. The isolated DC power supply voltage signal conversion circuit 6 includes an overcurrent protection circuit 601, a voltage divider circuit 602, and an electrical isolation circuit 603. The overcurrent protection circuit 601, the voltage divider circuit 602, and the electrical isolation circuit 603 are connected in sequence. The output terminal of the electrical isolation circuit 603 is connected to an AD module 7. The electrical isolation circuit 603 is connected to the MCU unit 1 through the AD module 7. The power output terminal of the base plate unit 5 is connected to the power supply unit 4. The power supply unit 4 provides power to the MCU unit 1, PORT unit 2, PHY unit 3 and AD module 7.

[0020] The overcurrent protection circuit 601 includes a resettable fuse, the voltage divider circuit 602 includes multiple high-precision wafer resistors, and the electrical isolation circuit 603 includes an AMC1350-Q1 chip. The self-resetting fuse has an input interface connected to one side and multiple high-precision wafer resistors connected to the other side. The multiple high-precision wafer resistors are connected in series and then connected to the AMC1350-Q1 chip. The output terminal of the AMC1350-Q1 chip is connected to the AD module 7. There are two isolated DC power supply voltage signal conversion circuits 6, forming two detection channels.

[0021] The MCU unit 1 uses an STM32F470 chip. The MCU unit 1 is equipped with peripheral circuitry.

[0022] The AD module 7 includes an ADS131M02 chip, which communicates with the MCU unit 1 via an SPI serial port.

[0023] A communication module is provided between the MCU unit 1 and the base plate unit 5. The communication module includes a 485 bus module 8 and a CAN bus module 9. The MCU unit 1 communicates with the base plate unit 5 through the 485 bus module 8 and the CAN bus module 9. The output terminal of MCU unit 1 is connected to a MOS switching circuit 10, which includes a MOS transistor. The output terminal of MCU unit 1 is connected to the gate of the MOS transistor. A slot position detection circuit 13 is also provided between the MCU unit 1 and the base plate unit 5. The slot position detection circuit 13 is located on the base plate unit 5 and is connected to the four GPIO pins of the MCU unit 1.

[0024] The PHY unit 3 includes a DP83848I chip, which is connected to the MCU unit 1 via MII serial communication. PHY unit 3 is connected to the network bus of base plate unit 5.

[0025] The power supply unit 4 includes a protection circuit, a DC12-5V isolation conversion circuit 11, and a DC12-3.3V conversion circuit 12. The protection circuit includes a resettable fuse and an LC filter circuit. The DC12V output of the base unit 5 is connected to the resettable fuse and the LC filter circuit. The LC filter circuit is connected to the DC12-5V isolation conversion circuit 11 and the DC12-3.3V conversion circuit 12, respectively. The DC12-3.3V conversion circuit 12 includes a SY8120I chip; The DC12-5V isolation conversion circuit 11 includes an IF1205XT-1WR3 isolation power supply chip.

[0026] During operation, the ATP power supply voltage signal is first processed by the isolated DC power supply voltage signal conversion circuit 6 in PORT unit 2, and then connected to the AD module 7 as an analog signal after being processed by the current protection circuit 601, voltage divider circuit 602 and electrical isolation circuit 603. The AD module 7 then transmits the converted digital signal to the MCU unit 1 via SPI serial communication. The MCU unit 1 further processes and analyzes the acquired data.

[0027] MCU unit 1 is equipped with a variety of peripheral circuits, including a clock circuit that provides a stable clock signal for MCU unit 1, a decoupling circuit that ensures the stability of the power supply, a reset circuit that can reset MCU unit 1 when needed, a current and voltage monitoring circuit that monitors the current and voltage in the circuit, a plug-in slot position detection circuit 13 that detects the position of the plug-in slot, and an information storage circuit that communicates with MCU unit 1 through an I2C interface to store relevant information.

[0028] MCU unit 1 is connected to PHY unit 3 through MII interface, enabling communication with external network; The system communicates with the baseboard unit 5 via the 485 bus module 8 and the CAN bus module 9 to achieve data transmission and exchange.

[0029] The DC12V output of the base unit 5 is connected to the protection circuit of the power supply unit 4. The protection circuit consists of a self-resetting fuse and an LC filter circuit. The self-resetting fuse can automatically recover when the circuit experiences abnormal conditions such as overcurrent. The LC filter circuit further filters out interference signals in the power supply to ensure the stability of the power supply.

[0030] The DC 12V power supply output from the protection circuit is connected in two ways: one to a DC 12-3.3V converter circuit 12 (using the SY8120I chip), which converts the voltage to 3.3V. Components requiring 3.3V power are connected to the DC 12-3.3V converter circuit 12 via a 3.3V line, and the other to a DC 12-5V isolation converter circuit 11 (using the IF1205XT-1WR3 isolation power chip), which converts the voltage to 5V. Components requiring 5V power are connected to the DC 12-5V isolation converter circuit 11 via a 5V line.

[0031] The output terminal of MCU unit 1 is connected to the gate of the MOS transistor in MOS switching circuit 10, which can control the MOS switching circuit and thus control the power supply on and off.

[0032] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. An isolated DC power supply voltage acquisition module, comprising a power supply unit (4), an MCU unit (1), a PHY unit (3), a base plate unit (5), and a PORT unit (2), wherein the PORT unit (2) is used to acquire external DC power supply voltage signals, the output terminal of the PORT unit (2) is connected to the MCU unit (1), and the MCU unit (1) is communicatively connected to the base plate unit (5), characterized in that, The PORT unit (2) includes an isolated DC power supply voltage signal conversion circuit (6), which includes an overcurrent protection circuit (601), a voltage divider circuit (602), and an electrical isolation circuit (603). The overcurrent protection circuit (601), the voltage divider circuit (602), and the electrical isolation circuit (603) are connected in sequence. The output terminal of the electrical isolation circuit (603) is connected to an AD module (7). The electrical isolation circuit (603) is connected to the MCU unit (1) through the AD module (7). The power output terminal of the base plate unit (5) is connected to the power supply unit (4). The power supply unit (4) provides power to the MCU unit (1), PORT unit (2), PHY unit (3) and AD module (7).

2. The isolated DC power supply voltage acquisition module according to claim 1, characterized in that, The overcurrent protection circuit (601) includes a resettable fuse, the voltage divider circuit (602) includes multiple high-precision wafer resistors, and the electrical isolation circuit (603) includes an AMC1350-Q1 chip. The self-resetting fuse has an input interface on one side and multiple high-precision wafer resistors on the other side. The multiple high-precision wafer resistors are connected in series and then connected to the AMC1350-Q1 chip. The output terminal of the AMC1350-Q1 chip is connected to the AD module (7). There are two isolated DC power supply voltage signal conversion circuits (6), which constitute two detection channels.

3. The isolated DC power supply voltage acquisition module according to claim 1, characterized in that, The AD module (7) includes an ADS131M02 chip, which communicates with the MCU unit (1) via an SPI serial port.

4. The isolated DC power supply voltage acquisition module of claim 1, wherein, A communication module is provided between the MCU unit (1) and the base plate unit (5). The communication module includes a 485 bus module (8) and a CAN bus module (9). The MCU unit (1) communicates with the base plate unit (5) through the 485 bus module (8) and the CAN bus module (9). The output terminal of the MCU unit (1) is connected to a MOS switching circuit (10), which includes a MOS transistor. The output terminal of the MCU unit (1) is connected to the gate of the MOS transistor. A slot position detection circuit (13) is also provided between the MCU unit (1) and the base plate unit (5). The slot position detection circuit (13) is located on the base plate unit (5) and is connected to the four GPIO pins of the MCU unit (1).

5. The isolated DC power supply voltage acquisition module of claim 1, wherein, The PHY unit (3) includes a DP83848I chip, which is connected to the MCU unit (1) via MII serial communication. The PHY unit (3) is connected to the network bus of the base plate unit (5).

6. The isolated DC power supply voltage acquisition module of claim 1, wherein, The power supply unit (4) includes a protection circuit, a DC12-5V isolation conversion circuit (11) and a DC12-3.3V conversion circuit (12). The protection circuit includes a resettable fuse and an LC filter circuit. The DC12V output of the base plate unit (5) is connected to the resettable fuse and the LC filter circuit. The LC filter circuit is connected to the DC12-5V isolation conversion circuit (11) and the DC12-3.3V conversion circuit (12) respectively. The DC12-3.3V conversion circuit (12) includes a SY8120I chip; The DC12-5V isolation conversion circuit (11) includes the IF1205XT-1WR3 isolation power supply chip.

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