A vehicle-mounted inverter monitoring and fault diagnosis system

Abstract

A kind of vehicle-mounted inverter monitoring and fault diagnosis system, including boost module, inverter module, MCU module;The MCU module is connected boost module, inverter module, CAN communication module respectively;The boost module connects inverter module;The boost module, the output direct current is converted into high-frequency pulse direct current, and pulse current is boosted, for the use of later-stage inverter module;The inverter module is used to convert high-frequency pulse direct current into sinusoidal wave alternating current.The utility model provides a kind of vehicle-mounted inverter monitoring and fault diagnosis system, realizes to vehicle-mounted inverter fault protection function, realizes the real-time monitoring of vehicle to vehicle-mounted inverter operating state and external load power consumption information, reduces the use risk and troubleshooting difficulty of vehicle-mounted inverter.

Description

Technical Field

[0001] This utility model relates to the field of vehicle inverter control technology, specifically to a vehicle inverter monitoring and fault diagnosis system. Background Technology

[0002] A vehicle inverter is an electronic device that converts the direct current (DC) power from a car battery into alternating current (AC). Internally, it contains a DC-DC boost circuit that raises the 24V DC voltage from the battery to 400V, which is then converted by the inverter circuit into 220V, 50Hz sinusoidal AC power, providing ample and stable power for various electrical appliances in the vehicle. However, existing vehicle inverters lack sufficient intelligence, failing to monitor their operational status in real time or promptly report faults when they occur, increasing the risks associated with their use and the difficulty of troubleshooting. Summary of the Invention

[0003] To address the aforementioned technical issues, this utility model provides a vehicle-mounted inverter monitoring and fault diagnosis system, which enables fault protection for the vehicle-mounted inverter, allows real-time monitoring of the vehicle's inverter operating status and external load power consumption information, and reduces the usage risks and troubleshooting difficulties of the vehicle-mounted inverter.

[0004] The technical solution adopted by this utility model is as follows:

[0005] A vehicle-mounted inverter monitoring and fault diagnosis system includes:

[0006] Boost module, inverter module, MCU module;

[0007] The MCU module is connected to the boost module, the inverter module, and the CAN communication module respectively; the boost module is connected to the inverter module.

[0008] The boost module converts the output DC power into high-frequency pulsed DC power and boosts the pulsed current for use by the subsequent inverter module.

[0009] The inverter module is used to convert high-frequency pulsed DC power into sinusoidal AC power.

[0010] The boost module includes a power switch and a high-frequency transformer. The boost module converts the 24V DC power output from the battery into high-frequency pulsed DC power through the power switch. The high-frequency transformer boosts the pulsed current for use by the subsequent inverter module.

[0011] The inverter module includes a full-bridge inverter circuit for converting high-frequency pulsed DC power into sinusoidal AC power.

[0012] The boost module includes an EG3525 chip and its peripheral circuits. The EG3525 chip has an external shutdown signal input terminal: the SHUTDOWN pin. The SHUTDOWN pin is connected to the MCU module. When the SHUTDOWN pin is connected to a high level, the output of the EG3525 chip is disabled.

[0013] The inverter module includes an EG8015 chip and its peripheral circuitry.

[0014] The MCU module is used to collect fault signals generated by the EG8015 chip, and after judging the fault signals, outputs a high level to the SHUTDOWN pin of the EG3525 chip to disable the EG3525 chip's output protection circuit.

[0015] The MCU module is used to monitor the working status information of external loads and upload fault information and load working status to the vehicle via the CAN communication module.

[0016] This utility model discloses a vehicle-mounted inverter monitoring and fault diagnosis system, which can realize real-time monitoring of the inverter's working status and external load power consumption information of the whole vehicle, reducing the usage risk of the inverter and the difficulty of fault diagnosis. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and examples;

[0018] Figure 1 This is the circuit diagram of the system of this utility model.

[0019] Figure 2 The present invention relates to the EG8015 chip and its peripheral circuitry in this system. Figure 1 ;

[0020] Figure 3 The present invention relates to the EG8015 chip and its peripheral circuitry in this system. Figure 2 .

[0021] Figure 4 The present invention relates to the EG3525 chip and its peripheral circuitry in this system. Figure 1 ;

[0022] Figure 5 The present invention relates to the EG3525 chip and its peripheral circuitry in this system. Figure 2 . Detailed Implementation

[0023] like Figure 1 As shown, an on-board inverter monitoring and fault diagnosis system includes functions for boosting, inverting, fault acquisition, fault diagnosis, fault handling, status monitoring, and data uploading. The system includes:

[0024] Boost module, inverter module, MCU module;

[0025] The MCU module is connected to the boost module, the inverter module, and the CAN communication module respectively; the boost module is connected to the inverter module.

[0026] The boost module includes a power switch and a high-frequency transformer. The boost module converts the 24V DC power output from the battery into high-frequency pulsed DC power through the rapid switching of the power switch. Then, a high-frequency transformer boosts the pulsed current to achieve the required voltage value for use by the subsequent inverter module.

[0027] The boost module includes an EG3525 chip and its peripheral circuitry. The EG3525 chip has an external shutdown signal input pin, SHUTDOWN. When this pin is connected to a high level, the EG3525 chip's output is disabled. Specifically, the SHUTDOWN pin of the EG3525 chip is connected to an MCU module. When a fault signal is detected, the MCU module outputs a high level to the SHUTDOWN pin, disabling the EG3525 chip.

[0028] like Figure 4 , Figure 5 As shown, the EG3525 chip integrates a wide-frequency oscillator (100Hz~500KHz) and a PWM comparator. By adjusting the duty cycle, it controls the on-time of the power transistor to regulate the output voltage. Combined with external components such as inductors and capacitors, it can form a boost circuit.

[0029] The inverter module includes a full-bridge inverter circuit, which converts the high-frequency pulse current generated by the front-end into 220V, 50Hz sinusoidal alternating current. Common inverter circuits have various topologies, such as half-bridge and full-bridge inverter circuits. Taking a full-bridge inverter circuit as an example, it consists of four power switching transistors. By controlling the alternating conduction and cutoff of these four transistors, the DC power supply is converted into AC power.

[0030] The inverter module includes an EG8015 chip and its peripheral circuits. The EG8015 chip has a built-in SPWM sine wave generator, which can generate a 24MHz clock oscillator with an accuracy of ±1%. It can generate a sine wave through SPWM to modulate DC power into 220V AC power.

[0031] like Figure 2 , Figure 3As shown, the EG8015 chip is a digital-analog hybrid chip that integrates two 600V half-bridge high-voltage MOS drivers and an SPWM sine wave generator, specifically designed for inverter products. The EG8015 has a built-in 24MHz high-speed clock oscillator with ±1% accuracy or can be configured with an external high-precision 24MHz crystal oscillator via the UART port. It can achieve high-precision, low-distortion, and low-harmonic pure sine wave 50Hz or 60Hz inverter-specific chip. It has built-in comprehensive protection functions, providing AC output undervoltage and overvoltage protection, overcurrent protection, overtemperature protection, and short-circuit protection indication.

[0032] The main function of the MCU module is to collect fault signals generated by the EG8015 chip, judge the fault signals, and output a high level to the SHUTDOWN pin of the EG3525 chip to disable the EG3525 chip's output protection circuit. Simultaneously, it monitors the operating status information of external loads, such as power consumption, voltage, current, and temperature, and uploads fault information and load operating status to the vehicle via the CAN communication module.

[0033] Working principle:

[0034] First, the 24V DC power output from the battery is converted into 220V, 50Hz sinusoidal AC power for electrical appliances via a boost module and an inverter module. The load current output status is monitored through the load current feedback input of the EG8015 chip. When short circuit, overcurrent, overvoltage, undervoltage, or overtemperature faults occur, the EG8015 chip generates corresponding fault signals. When the MCU module detects a fault signal, it pulls high the external shutdown signal input of the EG3525 chip, disabling the EG3525 chip's output, thus achieving fault protection. Simultaneously, the operating status of the external load, including power consumption, operating voltage, operating current, and temperature, is collected. The operating status and fault information of the external load are uploaded to the vehicle via the CAN communication module, achieving intelligent monitoring and fault diagnosis of the inverter's operating status by the entire vehicle.

Claims

1. A vehicle-mounted inverter monitoring and fault diagnosis system, characterized in that, It includes a boost module, an inverter module, and an MCU module; the MCU module is connected to the boost module, the inverter module, and the CAN communication module respectively. The boost module is connected to the inverter module; The boost module converts the output DC power into high-frequency pulsed DC power and boosts the pulsed current for use by the subsequent inverter module. The inverter module is used to convert high-frequency pulsed DC power into sinusoidal AC power.

2. The vehicle-mounted inverter monitoring and fault diagnosis system according to claim 1, characterized in that: The boost module includes a power switch and a high-frequency transformer. The boost module converts the 24V DC power output from the battery into high-frequency pulsed DC power through the power switch. The high-frequency transformer boosts the pulsed current for use by the subsequent inverter module.

3. The vehicle-mounted inverter monitoring and fault diagnosis system according to claim 1, characterized in that: The inverter module includes a full-bridge inverter circuit for converting high-frequency pulsed DC power into sinusoidal AC power.

4. The vehicle-mounted inverter monitoring and fault diagnosis system according to claim 2, characterized in that: The boost module includes an EG3525 chip and its peripheral circuits. The EG3525 chip has an external shutdown signal input terminal: the SHUTDOWN pin. The SHUTDOWN pin is connected to the MCU module. When the SHUTDOWN pin is connected to a high level, the output of the EG3525 chip is disabled.

5. The vehicle-mounted inverter monitoring and fault diagnosis system according to claim 4, characterized in that: The inverter module includes an EG8015 chip and its peripheral circuitry.

6. The vehicle-mounted inverter monitoring and fault diagnosis system according to claim 5, characterized in that: The MCU module is used to collect fault signals generated by the EG8015 chip, and after judging the fault signals, outputs a high level to the SHUTDOWN pin of the EG3525 chip to disable the EG3525 chip's output protection circuit.

7. The vehicle-mounted inverter monitoring and fault diagnosis system according to claim 1, characterized in that: The MCU module is used to monitor the working status information of external loads and upload fault information and load working status to the vehicle via the CAN communication module.

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