AC photoelectric switch circuit

Published:2011/5/27 7:09:00 Author:John | Keyword: photoelectric switch | From:SeekIC

The circuit acts when the light intensity is over 700LX. . At this moment, the phototransistor BFY52 and transistor BPX25 trigger current to thyristor BTY91/800R. Where there is bright light on the phototransistor, the trigger pulse always occurs at each positive half cycle beginning of about 6 °. The maximum arithmetic average of load-through DC half-wave current is 16A. Regulator BZY88/C5, transistor T1 and its connection resistor 390Ω form to limit the voltage in trigger circuit to not exceed 6V. Diode BYX45/800R is used to block the negative half-cycle grid voltage. The resistor 33Ω and capacitor 0.1μF are used to protect the thyristor against over-voltage.



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