Optocoupler having normally-on driving element

摘要: An optocoupler having a driving traic and at least one normally-on element couple in series to the triac. A light emitting turns on triac time when phase of load current is about 0°. The composed either MOSFET, or optionally relay, an associated for turning off 90°. arrangement prevents inrush commutation failure, provides which can be turned with prescribed timing. Alternative embodiments are disclosed that turn itself abnormality occurs, example, ambient temperature rises extremely high level.