Switching machine protecting circuit of vehicle information system

Abstract

The invention discloses a switching machine protecting circuit of a vehicle information system, which comprises a switching machine control circuit, wherein an input end of the switching machine control circuit is connected with an output end of an engine / generator and an output end of the switching machine control circuit is connected with a switching machine control signal end, the switching machine control circuit is powered by a storage battery and comprises a fast power-on circuit and a delay discharging circuit which are connected with each other in parallel between the output end of the engine / generator and the switching machine control signal end. The switching machine protecting circuit of the vehicle information system has the characteristics of fast power-on, delay discharging, high reliability, low standby current and low cost, and can be extensively applied to the field of electronic information system of vehicle.

Description

technical field [0001] The invention relates to the field of automotive electronic information systems, in particular to an on-off protection circuit for an on-board information system. Background technique [0002] When the car is ignited, the circuit of the whole vehicle will fluctuate. These fluctuations may cause uncertain damage to the vehicle information system. Therefore, it is necessary to delay the start to ensure that the circuit of the whole vehicle reaches a stable state to stagger the fluctuations. Generally, the time is 1 -2 seconds. [0003] When the ignition key is reset to the OFF state, the vehicle information system needs a period of time to perform the normal system shutdown procedure, and the power cannot be cut off immediately, otherwise the data will be damaged. This requires a shutdown delay circuit, which takes 30-60 seconds. At the same time, in any case, if the shutdown command is issued for more than a certain period of time (such as setting 2 mi...

AI Technical Summary

Problems solved by technology

At the same time, in any case, if the shutdown command is issued for more than a certain period of time (such as setting 2 minutes), the power must be cut off forcibly, and the standby current will be kept at a very low level (less than 1mA) after the power is cut off, otherwise it will cause risks such as power loss to the car battery , directly causing the car to fail to start

[0004] In order to control the time, software can be used and controlled by a specific processor, but since switching on and off is a very critical action, the software method has problems of low reliability and high standby current, which has certain risks

At the same time, the selection of specific processors and software also makes the cost higher

Images