High voltage solid-state switch with current limit

Details High voltage solid-state switch with current limit High voltage solid-state switch with current limit

1991-05-21

1992-09-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

051461005

ABSTRACT:
Two enhancement mode MOSFETs in series are used to provide a solid-state switch. The MOSFETs are turned on by a photovoltaic array. Resistors in series with the MOSFETs serve to provide a control voltage to current-limit the circuit. An additional photovoltaic array is used to supply drain to gate bias when the switch is off to minimize device capacitance. The circuits can be cascaded to raise the voltage-handling limits.

REFERENCES:
patent: 4408131 (1983-10-01), Fox
patent: 4423330 (1983-12-01), El Mamamsy
patent: 4682061 (1987-07-01), Donovan
patent: 4742380 (1988-05-01), Chang et al.
patent: 4745311 (1988-05-01), Iwasaki
patent: 4777387 (1988-10-01), Collins
patent: 4864126 (1989-09-01), Walters
patent: 4902901 (1990-02-01), Pernyeszi
patent: 4916323 (1990-04-01), Hayashi et al.
patent: 4939375 (1990-07-01), Walters et al.

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