Hi All,

I have done some minor controls of products that have been UL, CSA, CCC approved and CE Marked. The controls did not include safety shutdown circuits. I was wondering how difficult it would be to have the safety shutdown controls on the PIC and get it approved by the agencies. The product would be a welding power supply. The safety circuit cuts the bias supply and opens a contactor relay.
The shutdown is caused by excessive output voltage, or over temperature. I save some cost by putting this in code instead of analog comparators.

Any shared experiences are appreciated.

Fred

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