A Detection Circuit of Automobile Ignition Action

Abstract

The invention provides a detecting circuit for the automobile ignition action. The detecting circuit comprises a first one-way conduction pipe, a static and overcurrent protection circuit and a judgment circuit. The static and overcurrent protection circuit is connected between the judgment circuit and an automobile power source and used for providing the overcurrent protection and static removing protection on the input voltage of the judgment circuit. The input end of the first one-way conduction pipe is connected with the positive electrode of the automobile power source. The output end of the first one-way conduction pipe is connected with the input end of the judgment circuit. By means of the first one-way conduction pipe and the static and overcurrent protection circuit, the ignition action detecting accuracy rate can be effectively increased.

Description

technical field [0001] The invention belongs to the field of circuit detection, in particular to a detection circuit for an automobile ignition action. Background technique [0002] When the car is ignited, the battery needs to output a very large current to drive the ignition device. Due to the internal resistance of the battery itself, the battery voltage will drop at this time. Therefore, the detection of this drop voltage can be used to determine whether the vehicle has an ignition action. [0003] However, due to the high-voltage ignition system in the car interior, switching devices (such as relays), inductive loads (such as motors), electronic control systems, and other loads with sudden changes in current, transient pulse groups may be superimposed on the power system, thus It may cause false detection in the detection circuit of the car's ignition action. Contents of the invention [0004] The purpose of the present invention is to provide a detection circuit f...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a detection circuit for the ignition action of an automobile, so as to solve the problem that may occur in the prior art due to sudden changes in the current of the high-voltage ignition system, switching devices, inductive loads, electronic control systems, and other loads in the interior of the automobile. The transient pulse group is superimposed on the power system, which may cause false detection in the detection circuit of the car's ignition action

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