Photoelectric switch circuit in AC network

Published:2011/5/5 7:53:00 Author:Nicole | Keyword: photoelectric switch, AC network | From:SeekIC

When the light intensity is more than 700lx, this circuit will take action. The light-sensitive transistor BPX25 and transistor BFY52 provide SCR BTY91/800R with trigger current. When the light-sensitive transistor has light, this trigger pulse always appears about 6°behind each positive half cycle starting point, the maximum arithmetic mean value of DC half wave current flows load is 16A. The regulator tube BZY88/C5 and transistor T1, the connected resistance 390Ω are used to limit trigger circuit voltagenomore than 6V. Diode BYX45/800R is used to break negative half cycle network voltage, the resistance 33Ω and capacitance 0.1μF are used to protect SCR, it can prevent overvoltage.



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