Light contrtol switch circuit using TRIAC

Published:2011/11/10 1:46:00 Author:May | Keyword: Light contrtol switch, TRIAC | From:SeekIC

Light contrtol switch circuit adopts bidirectional thyristor. This circuit can control make-and-break of 200W power load on 220V AC network . If the power is only 50W, bidirection thyrisotr can not connect radiator. The action point with some hysteresishas about 100lx sun light. When light is weak, thephotoresistor presents high resistance, then the threshold switch TCA345's input voltage ishigher than 0.7 times of pin 2's voltage , and thethreshold switch output end is in high resistance value,then it is breakover bytransistor period triggering bidirectional thyristor. Contrarily, if surrounding light exceeds100lx, threshold switch output end changes to negative, at this time, proclitic transistor and bidirectional thyristor arecut-off, then lamp goes out. Diodes D1 and D2 in the circuit areused for rectification, and it outputs about 15mA controlling current.



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