Photocoupled circuit with photodiode arrays driving a MOSFET swi

Details Photocoupled circuit with photodiode arrays driving a MOSFET swi Photocoupled circuit with photodiode arrays driving a MOSFET swi

1994-03-18

1995-05-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

327514, G02B 2700

Patent

active

054183812

ABSTRACT:
A photocoupler apparatus includes a light emitting diode, a first photodiode array which generates a first electromotive force by being activated with a light signal from the light emitting element, and an output MOSFET which is driven by the first electromotive force. This apparatus further includes a current limiting circuit and a second photodiode array which generates a second electromotive force by being activated with the light signal from the light emitting diode. The current limiting circuit controls the behavior of the MOSFET so as to limit an output current below a predetermined value. In addition, this circuit is driven by the second electromotive force generated by the second photodiode array. So, the whole resistance of this apparatus as a product can be greatly reduced and a photocoupler apparatus having a high current capacity can easily be obtained in this invention.

REFERENCES:
patent: 4390790 (1983-06-01), Rodriguez
patent: 4647794 (1987-03-01), Guajardo
patent: 5013926 (1991-05-01), Aizawa
patent: 5146100 (1992-09-01), Banaska
"Optically Coupled Power Mosfet Technology: A Monolithic Replacement For Electromechanical Relays", Edward T. Rodriguez, Electro '83, Session Record 7/3, IEEE, pp. 1-9, 1983.

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