Drainer control circuit

The utility model relates to a drainer control circuit. The circuit comprises a power supply interface J1, a liquid level sensor interface J2, a manual interface J3, a voltage reduction power supply chip U1, a piezoresistor RV1, a rectifier bridge DB1, diodes D1 to D6, capacitors C1 to C4, resistors R1 to R11, an inductor L1, triodes Q1 to Q3, an electromagnetic valve coil L2 and a relay K1. And the model of the step-down power supply chip U1 is XD308H. According to the drainer control circuit, the energization of the solenoid valve coil L2 is controlled by the energization action of the relayK1, so that the action mode of controlling high voltage by low voltage is realized, the problem of insufficient driving power in the prior art is solved, and the working reliability of the drainer control circuit is ensured. 本实用新型涉及一种排水器控制电路，包括电源接口J1、液位传感器接口J2、手动接口J3、降压电源芯片U1、压敏电阻RV1、整流桥DB1、二极管D1～D6、电容C1～C4、电阻R1～R11、电感L1、三极管Q1～Q3、电磁阀线圈L2、继电器K1，降压电源芯片U1的型号为XD308H。本实用新型的排水器控制电路由继电器K1的通电动作来控制电磁阀线圈L2的通电，实现小电压控制大电压的动作方式，消除现有技