Automobile and automobile power supply system dormancy control circuit

Abstract

A dormancy control circuit for an automobile and its power supply system, comprising a starting power supply, a BMS host and at least one BMS slave, a CAN bus, at least one power supply voltage detection unit, and at least one slave power management unit; the slave power management unit is connected to Between the corresponding BMS slave and the starting power supply; wherein, the BMS host enters the starting state and the dormant state according to the starting signal and the stop signal of the car, and controls the power supply and power-off of the CAN bus; the slave The machine power management unit controls the power-on or power-off of the BMS slave machine connected to it according to the power supply voltage of the CAN bus. According to the start and stop status of the car, the BMS host controls the power supply of all BMS slaves to ensure that all slave modules are powered off and dormant when the car is not in use. Once the car is started, the host will wake up all slave modules normally. Work, greatly reducing the power consumption of the system, avoiding undervoltage or insufficient capacity of the starting power supply.

Description

technical field [0001] The invention relates to battery control technology, in particular to a dormancy control circuit for an automobile and an automobile power supply system. Background technique [0002] At present, all the power supply of the BMS (Battery Management System, battery management system) system is supplied from the 12V / 24V DC power supply of the car battery. As a result, the BMS system cannot work normally. [0003] With the rapid development of new energy electric vehicles, the requirements for the self-consumption of the BMS system of electric vehicles are becoming more and more stringent. At present, the power supply system of the BMS of electric vehicles basically takes power from the starter battery. The current power supply system of the slave machine: [0004] 1. The vehicle battery supplies constant power: all slave modules are connected through the CAN (Controller Area Network) bus, where the CAN bus includes CAN+ port, CAN- port, GND port, VCC+ po...

AI Technical Summary

Problems solved by technology

The disadvantages are: all slave modules are connected in series on the bus, when the power supply of a node on the bus is damaged, the subsequent modules will stop working; when the starting power supply is undervoltage or insufficient capacity, all slave modules cannot provide stable power machine module will stop working

The disadvantages are: the power supply of CAN is not uniform, which will cause bus interference; the slave module has been powered by the starting power supply, which will increase the inconsistency of the battery

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