An optically coupled semiconductor switch and driving method adapted thereto.

摘要

A PNPN semiconductor switch can be optically turned-off to electrically isolate a circuit system from a control system. An optically coupled semiconductor switch driven by a first LED (21) comprises a second LED (22) and a switching circuit (23) driven by the second LED (22) connected in parallel to a resistor (3) connected between a P gate and a cathode of the switch.