Control AC load interface circuit

Published:2011/5/12 2:18:00 Author:Nicole | Keyword: control AC load, interface | From:SeekIC

MC6820 external interface converter drives NAND gate 7400, 7400 output singal is fed to MOC3011 photoelectric isolator, it controls three terminal TRIAC which controls AC resistance load or AC inductive load. To connect transistor timing circuit on the second input terminal of 7400 NAND gate , the TRIAC is on conduction only when the AC input voltage pass zero point. It can delay the usefil time of incandescent lamp, and reduce surge current to attack three terminal TRIAC, and decrease the back-EMF produced by load switch.



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