我看了94年《电子制作》第4期《实用水塔水位自动控制装置》一文后,觉得美中不足的是:不供水时,晶体管及继电器长时间处于饱和状态,耗电较多。另外,由于交流接触器回路受继电器常闭触点控制,一旦控制电路发生故障,就会使继电器触点释放,造成水泵不停地供水。其实,只要对原电路稍微改动一下,就可避免上述现象的发生。改动思路是:塔内水满时,晶体管截止,继电器常开触点维持原状,水泵停止供水;塔内 After reading the article entitled “Automatic Water Level Control Device for Utility Water Tower” in “Electronic Production” No. 4 in 1994, I found the fly in the ointment is that transistors and relays are saturated for a long time and consume more power when water is not supplied. In addition, because the AC contactor circuit normally closed by the relay contact control, once the control circuit fails, it will release the relay contacts, causing the pump to constantly water. In fact, as long as the original circuit a little change, you can avoid the above phenomenon. Change the idea is: when the tower is full of water, the transistor ends, the relay normally open contact to maintain the status quo, the water pump to stop water; tower