The dual-way controllable silicon working principle circuit of the liquid level control

Published:2011/6/20 21:53:00 Author:Seven | Keyword: controllable silicon, working principle, liquid level control | From:SeekIC

See as the figured circuit, the controller composed of the water level detector, trigger controller and step-down rectifier circuit, etc. The bias circuit composed of water detecting poles of a, b, c, W1, R1,R2 and R3 is the level detector.When the level is under b, Vp-b≈R3×VDD/（Rw1+R1+R2+R3）<1/3VDD, 555 is offset, SCR is triggered and conducting, the motor runs and draws water.When the level is above a, Vp-a≈R3×VDD/（Rw1十R3）＞2/3VDD, 555 is reset, 3-pin is in a low LEV. SCR is blocked and the motor stops running .



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