Power supply switch control circuit for vehicle-mounted electronic equipment

Abstract

The invention relates to a power supply switch control circuit for a vehicle-mounted electronic product adaptive to requirements for automatic power switching-on and switching-off state controlling. The power supply switch control circuit at least comprises: a vehicle switch signal input circuit, a vehicle switch signal acquisition circuit, an equipment switch signal input circuit and a switch signal synthesis output circuit, wherein the switch signal of a vehicle is connected with the vehicle switch signal input circuit, and the output signal of the vehicle switch signal input circuit is respectively connected with the vehicle switch signal acquisition circuit and the switch signal synthesis output circuit. An equipment switch signal is connected with the switch signal input circuit and the output signal of the switch signal input circuit is connected with the switch signal synthesis output circuit. The switch signal synthesis output circuit outputs a synthesized switch control signal to an external equipment power switch. By using the power supply switch control circuit provided by the invention, a function of jointly controlling equipment power switching-on and switching-off states by using the vehicle switch signal and an equipment switch control signal can be realized, a vehicle switch starting function and a vehicle switch shutdown delaying function are realized, and equipment starting and damages which are caused by the accidental change of the vehicle switch signal can be prevented.

Description

technical field [0001] The invention relates to a signal synthesizing circuit, in particular to a switch machine control circuit of vehicle-mounted electronic equipment. Background technique [0002] Vehicle-mounted electronic equipment is usually controlled by a vehicle switch. When the switch is turned on, the vehicle battery supplies power to the electronic equipment, otherwise the power supply is cut off. This method of operation will not cause too many problems for simple devices such as radios or CD players, but if the device is more complex, including some devices or functions that cannot be directly powered off, it will cause abnormal states or damage to equipment. For example, the operating system inside the device is damaged due to a sudden power failure, the hard disk is damaged due to a sudden power failure, and the external moving parts controlled by the electronic device cannot be reset normally due to a sudden power failure. Therefore, it is necessary to des...

AI Technical Summary

Problems solved by technology

This method of operation will not cause too many problems for simple devices such as radios or CD players, but if the device is more complex, including some devices or functions that cannot be directly powered off, it will cause abnormal states or equipment damage

For example, the operating system inside the device is damaged due to a sudden power failure, the hard disk is damaged due to a sudden power failure, and the external moving parts controlled by the electronic device cannot be reset normally due to a sudden power failure.

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