这里介绍的自动上水控制电路,可以应用在高层楼房的水箱上水自动控制,以及用户冷却水上水控制等。本电路经多次实验,并通过长时间使用,效果良好。其特点是简单、实用、工作稳定、动作灵敏。电路如所示。现将原理介绍如下。 220V交流电通过变压器T成为12V低压,再经D1-D4整流获得12V直流供给继电器J2、J3,J1由J3的常闭触头提供 The automatic water control circuit introduced here can be applied to the automatic control of water tank water supply in high-rise buildings, as well as user cooling water control. This circuit has been tested many times and has been used for a long time. Its characteristics are simple, practical, stable, and sensitive. The circuit is as shown. The principle is introduced as follows. The 220V alternating current passes through the transformer T and becomes 12V low voltage, and then the 12V DC supply relays J2, J3 are obtained by the D1-D4 rectification. J1 is provided by the normally closed contact of J3.