Normally open solid state relay with minimized response time of

Details Normally open solid state relay with minimized response time of Normally open solid state relay with minimized response time of

1992-08-26

1994-01-11

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700, H03K 342

Patent

active

052784223

ABSTRACT:
A solid state relay circuit includes a MOSFET receiving a photovoltaic output generated across a photovoltaic diode array responsive to a light signal from a light emitting element, a control electrode of a normally ON type driving transistor made to be at a high impedance state by a voltage generated across an impedance element connected in series to the photovoltaic diode array upon application of the photovoltaic output across the gate and source of the MOSFET and at a low impedance state upon disappearance of the photovoltaic output is connected to a connecting point between the diode array and the impedance element, and the driving transistor is connected across the gate and source of the MOSFET with a resistor interposed. A falling gradient of output signal upon being turned OFF of the relay circuit is made thereby sufficiently gentle, and relay operation upon being turned OFF can be minimized in response time.

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