Electromagnetic valve control circuit and electromagnetic valve closing self-checking method thereof

Abstract

The invention provides an electromagnetic valve control circuit and an electromagnetic valve closing self-checking method thereof. The electromagnetic valve control circuit comprises an electromagnetic valve circuit composed of a microprocessor circuit, an electromagnetic valve, a triode Q 1, a polar capacitor C1, a current limiting resistor R1 and a current limiting resistor R4 and a partial pressure sampling circuit composed of a partial pressure resistor R2 and a sampling resistor R3, wherein the analog-to-digital conversion input end of the microprocessor circuit is connected with one end of the sampling resistor R3. The method comprises the following steps that: a microprocessor U1 controls the conduction and timelag of the triode Q 1, and the sample voltage V1 of the sampling resistor R3 is collected; then, the microprocessor U1 controls the disconnection and timelag of the triode Q 1, controls the conduction and timelag of the triode Q 1, and collects the sample voltage V2 of the sampling resistor R3; and finally, the sample voltage V1 and V2 are compared, if the sample voltages V1 and V2 are the same, the electromagnetic valve is not closed, on the contrary, the electromagnetic valve is already closed. The electromagnetic valve control circuit is scientific in design and high in security; and the method is easy to realize, and occupied system resources are few.

Description

technical field

[0001] The invention relates to a control circuit, in particular to a solenoid valve control circuit and a self-checking method for closing the solenoid valve. Background technique

[0002] At present, some models of household gas detectors on the market are equipped with a gas solenoid valve linkage control device. Although this type of product can realize gas-off linkage control, the product itself does not have the ability to detect whether the solenoid valve is effectively connected or whether it is effective. Closed detection device or method; the solenoid valve is connected to the corresponding interface of the detector, and the solenoid valve will be closed when the detector alarms. However, in the use of the product, it is inevitable that there will be the following situations: The signal to close the solenoid valve fails; or, when the detector alarms, although the signal to close the solenoid valve is sent, the solenoid valve is blocked by foreign ob...

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