Automobile and automobile power supply system dormancy control circuit

Abstract

The invention discloses an automobile and an automobile power supply system dormancy control circuit. The automobile power supply system dormancy control circuit comprises a start power supply, a BMS(Battery Management System) main engine, at least one BMS slave engine, a CAN bus, at least one power supply voltage detection unit and at least one slave engine power supply management unit, whereinthe slave engine power supply management units are connected between the corresponding BMS slave engines and the start power supply; the BMS main engine enters a start state and a dormancy state according to start signals and stop signals of the automobile and controls power supply and power cutoff for the CAN bus; and according to the power supply voltage of the CAN bus, the slave engine power supply management unit controls power on or power off of the connected BMS slave engine. According to the start or stop state of the automobile, the BMS main engine controls power supply of all BMS slave engines, all slave engine modules are power-off and dormant in a condition in which the automobile stops and is not used, once the automobile starts, the main engine then wakes up all slave engine modules to work normally, the power consumption of the system is greatly reduced, and under voltage or insufficient capacity of the start power supply is avoided.

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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