Monday, 27 May 2013

Electronic AC surge protection - modify circuit

Electronic AC surge protection - modify circuit

this is my first question, so there may be some mistakes.
I was asked for help with designing an electronic AC overvoltage protection. My buddy were able to design this so far:
Electronic AC overvoltage protection circuit
However, he has no more time for this project and I would like to finish it. He told me that this will not work for AC and pointed out these modifications:
change Q1 to tyristor with MOC3042
rectify and filter the voltage for electronics
This is the source circuit he was inspired by: source circuit
Could you please help me find or design working electronic AC overvoltage protection of this kind? Thanks.

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