Semiconductor relay circuit.

摘要

A semiconductor relay circuit includes a MOS FET (14) receiving a photovoltaic output generated across a photovoltaic diode array (13) responsive to a light signal from a light-emitting element (12), across gate and source electrodes (15,15a) of which MOS FET a control circuit (16) is connected to be at a high impedance state during the generation of the photovoltaic output but to be at a low impedance state upon disappearance of the output, and resistors (17,18) are inserted in series respectively in each of a path flowing a current from the photovoltaic diode array across the gate and source electrodes of the MOS FET and a path flowing a discharge current from a capacity across the gate and source electrodes of the MOS FET to the control circuit, whereby the setting of rise and fall of circuit output signals can be made easier.