RELE ALLO STATO SOLIDO COMMUTANTE IN CORRISPONDENZA AL VALORE ISTAN TANEO NULLO DI TENSIONE

摘要

A solid state relay or controlled switch which may be utilized in place of an electromechanical relay to conduct AC power from a source to a load. The solid state relay includes a load current carrying portion and a control portion which has complete and permanent electrical isolation from the load current carrying portion. The load current carrying portion is controlled exclusively by photon coupling between a photon generator in the control portion and a photon-activated element in the load current carrying portion. A variable impedance device affects the photon switching sensitivity of the photon-activated element and provides the logic necessary for switching at essentially a zero voltage.