Protection control circuit of electric extinguisher

Abstract

The invention discloses a protection control circuit of an electric extinguisher. The protection control circuit comprises a DC-DC voltage reducing circuit, a 555 time delay control circuit, a P-MOS transistor control circuit, a first N-MOS transistor control circuit, a second N-MOS transistor control circuit and an overcurrent turn-off circuit; the input end of the DC-DC voltage reducing circuit is connected with a power supply, the output end of the DC-DC voltage reducing circuit is connected with the 555 time delay control circuit and the P-MOS transistor control circuit, the output end of the P-MOS transistor control circuit is connected with the positive-phase input end of a motor, the first N-MOS transistor control circuit is connected with the positive-phase input end of the motor, a micro control switch (S1) and the overcurrent turn-off circuit, and the second N-MOS transistor control circuit is connected with the negative-phase input end of the motor, a micro control switch (S2) and the overcurrent turn-off circuit. Accordingly, the condition that when the motor does not run in place, the motor continuously runs to be burnt can be prevented, and the condition that the micro control switches are crushed can be avoided.

Description

technical field [0001] The invention relates to a protection control circuit of an electric flame extinguisher, which belongs to the technical field of motor vehicle flame extinguishing control. Background technique [0002] With the development of the automobile industry, the application of electronic products in automobiles has become more and more extensive. Now the method of controlling the flameout of automobiles has changed from the initial manual flameout to electric flameout, which can be roughly divided into two types: solenoid valve type and motor type. The working principle of the motor type is: when the ignition lock is in the ON gear, the motor rotates forward until the transfer switch is turned off; when the ignition lock is in the OFF gear, the motor reverses until the transfer switch is turned off. The seemingly perfect process has hidden dangers: 1. When the motor is blocked, the transfer switch does not operate, so the motor will continue to work, which wil...

AI Technical Summary

Problems solved by technology

The seemingly perfect process has hidden dangers: 1. When the motor is blocked, the transfer switch does not operate, so the motor will continue to work, which will inevitably cause the motor to burn out; 2. The switch carries current, causing oxidation and adhesion of the switch contacts; 3. , the inertia of the DC motor makes it impossible to stop immediately when it hits the transfer switch, and the transfer switch will be squeezed slowly

The above three situations are the three main reasons for the failure of the controller

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