A battery protection method and circuit for vehicle-mounted equipment

Abstract

The invention relates to battery protection technology of vehicle equipment. The battery protection method of the vehicle-mounted device of the present invention comprises the following processing steps: setting the cut-off voltage point of the vehicle battery, that is, the lower limit value of the power supply voltage of the vehicle battery; detecting the signal of the vehicle key to judge the state of the vehicle generator; when the vehicle generator is In the static state, the automatic low-voltage shutdown function of the battery protection circuit is turned on. When the car generator is in working state, the automatic low-voltage shutdown function of the battery protection circuit is turned off; the battery protection circuit detects the power supply voltage of the car battery in real time. The power supply voltage to the car battery is lower than the cut-off voltage point of the car battery, and the battery protection circuit automatically cuts off the power supply to the on-board electronic equipment. The invention is applied to the protection of the power supply module of the automobile storage battery.

Description

technical field [0001] The invention relates to battery protection technology of vehicle equipment. Background technique [0002] With more and more types of vehicle-mounted electronic equipment, such as vehicle-mounted GPS terminals, vehicle-mounted electronic dogs, reversing sensors, driving recorders, vehicle-mounted navigation systems, etc., these vehicle-mounted electronic devices generally do not have an independent power supply, but directly use the car As the power supply of the battery, the power supply pressure of the car battery is constantly increasing. Therefore, higher requirements are put forward for the design of the power supply system of various vehicle electronic equipment. Taking the vehicle-mounted GPS terminal as an example, the functions of the vehicle-mounted GPS terminals on the market are becoming more and more powerful, especially after integrating functions such as access control and monitoring, it is objectively required that the vehicle-mounted ...

AI Technical Summary

Problems solved by technology

However, this method requires the user to purchase the advanced vehicle-mounted GPS terminal, and it can only be applied to the vehicle-mounted GPS terminal, but cannot detect other vehicle-mounted electronic devices

[0004] Therefore, in the prior art, there is also a lack of an effective method for over-discharge protection of the car battery for all vehicle-mounted electronic devices.

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