A low-voltage warning and automatic power-off protection circuit for a vehicle battery

Abstract

A low-voltage early warning and automatic power-off protection circuit for a vehicle battery, using the characteristics of a three-terminal controllable precision voltage regulator and the switching characteristics of a triode and a MOS tube, using a combination of a three-terminal controllable precision voltage regulator, a triode and a MOS tube The control method, combined with the ACC signal control method on the car, realizes the low-voltage warning and automatic power-off protection of the car battery. The circuit of the present invention can be applied to the vehicle-mounted multimedia display screen with entertainment playing function, and is used to remind the driver that the car battery has been consumed to a critical voltage state where the car can be started normally, and at the same time, the total power supply of the multimedia display screen is automatically cut off, thereby To protect the car battery; at the same time, the invention has a low-voltage early warning, so as to timely remind the driver that the battery is in an abnormal state, and it needs to be charged or repaired and replaced in time, and has low-voltage automatic power-off protection; in addition, the invention has low-cost , The application is convenient, the hardware is directly completed, and there is no need for software control.

Description

technical field [0001] The invention relates to the technical field of multimedia system terminal control, in particular to a low-voltage early warning and automatic power-off protection circuit for a vehicle battery. Background technique [0002] With the development of automotive electronics, the application of vehicle-mounted multimedia display screens in the automotive field is becoming more and more extensive. Among them, the multimedia display screens all have entertainment playback functions, such as MP3 and MP4 playback functions. In daily life, for the sake of driving safety, the general multimedia display screen will restrict the video playback function in the driving state. When the driver needs to use the MP4 video playback function, he can only do it in the parking state. Drivers sometimes need to wait in one place for a long time, such as bus drivers waiting for customers for a long time, truck drivers waiting for loading and unloading, etc., in order to save f...

AI Technical Summary

Problems solved by technology

In daily life, for the sake of driving safety, the general multimedia display screen will restrict the video playback function in the driving state. When the driver needs to use the MP4 video playback function, it can only be done in the parking state.

Drivers sometimes need to wait in one place for a long time, such as bus drivers waiting for customers for a long time, truck drivers waiting for loading and unloading, etc., in order to save fuel, the driver often turns off the car and only turns on the ACC to watch the MP4 on the multimedia display Videos are used to kill time, and at this time, because the car is turned off, the engine itself cannot charge the battery in the car in real time, and the multimedia display screen is always playing, which will cause excessive loss of the battery in the car for a long time, which will cause the car to crash. When it reboots it doesn't boot properly, causing huge headaches

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