Solenoid valve control circuit and solenoid valve switch-in self-checking method thereof

Abstract

The invention discloses a solenoid valve control circuit and a solenoid valve switch-in self-checking method thereof. The solenoid valve control circuit comprises a solenoid valve circuit and a voltage dividing and sampling circuit. The solenoid valve circuit comprises a microprocessor circuit, a solenoid valve DC, an audion Q1, a polar capacitor C1, a current limiting resistor R1 and a current limiting resistor R4, and the voltage dividing and sampling circuit comprises a divider resistor R2 and a sampling resistor R3. The analog-to-digital conversion input end of the microprocessor circuit is connected with one end of the sampling resistor R3. The solenoid valve switch-in self-checking method includes the following steps that a microprocessor U1 controls the audion Q1 to be disconnected, and the sampling voltage V1 of the sampling resistor R3 is collected; then the audion Q1 is controlled to be conducted and delayed, wherein the delay time is T1, and the sampling voltage V2 of the sampling resistor R3 is collected; and after that, the sampling voltage V1 is compared with the sampling voltage V2; if V1 is equal to V2, the solenoid valve is not switched in, otherwise, the solenoid valve is switched in. The solenoid valve control circuit has the advantages of scientific design and high safety, and the method occupies fewer resources of the system, is easy to realize, low in cost, simple and practical.

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 solenoid valve access. 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 objects...

AI Technical Summary

Problems solved by technology

[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 objects, causing the solenoid valve to fail to close

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