Semiconductor relay circuit using photovoltaic diodes

Details Semiconductor relay circuit using photovoltaic diodes Semiconductor relay circuit using photovoltaic diodes

H - Electricity

03

K

328/114.1

H03K 17/78 (2006.01) H01L 31/173 (2006.01) H03K 17/785 (2006.01)

Patent

CA 2035496

A semiconductor relay circuit includes a MOS FET receiving a photovoltaic output generated across a photovoltaic diode array in response to a light signal from a light-emitting element. Across gate and source electrodes of the MOS FET, a control circuit 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. Accordingly, resistors are inserted in series respectively in each of a path of a current flowing from the photovoltaic diode array across the gate and source electrodes of the MOS FET and the other path of a discharge current flowing 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.

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