Photovoltaic relay switch

Details Photovoltaic relay switch Photovoltaic relay switch

1984-11-21

1987-05-12

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

046653163

ABSTRACT:
A photovoltaic relay which includes a unique pull down circuit for rapidly turning off the relays field effect transistor(s). The pull down circuit discharges the gate-to-source capacitance of the relay's field effect transistors by turning on a thyristor by turning off a light-activated switch connected between the gate and the cathode terminals of the thyristor. In one integrated circuit embodiment, the light-activated switch is energized by the same light source which activates the photodiode stack which drives the relay. The presence of the pull down circuit does not effect the turn on time of the relay.

REFERENCES:
patent: 4227098 (1980-10-01), Brown et al.
patent: 4295058 (1981-10-01), Lade et al.
patent: 4296331 (1981-10-01), Rodriguez
patent: 4390790 (1983-06-01), Rodriguez
patent: 4419586 (1983-12-01), Phipps
Theta-J Corporation, Data Sheet "OptoMOS, OptoFilm", article entitled, OptoMOS Optically Coupled MOSFET Relays.
Crydom, Data Sheet "The Crydom Photovoltaic Relay (PVR)" and The Crydom BOSFET.
Dionics Inc., Data Sheets, "ISO-GATE Devices," p. 1; DIG-11-06-030, p. 2; DIG-12-06-025, p. 3; and ISO-GATE Device Applications, p. 4.
Dionics Inc. Reprint from Electronic Design, Jun. 24, 1982, "Dionics has the Latest Word in Solid State Relay Design".
Dionics Inc., Reprint from Electronic Products, Jun. 1982, "Family Includes `Industry First` Dual-output Devices.".

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