Optocoupler for power FET

Details Optocoupler for power FET Optocoupler for power FET

1988-08-24

1989-08-22

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307270, 307570, 307565, 307549, 250551, H03K 342, G02B 2700

Patent

active

048598755

ABSTRACT:
A power FET is driven by a photodiode chain across a switch, which has two FETs (5, 6) arranged in series. Upon illumination the first FET (5) is driven to be conducting, which permits current to flow from a capacitor (C) connected to a fixed voltage into the gate-source capacitor (C.sub.GS) of the power FET (1) and to switch it on rapidly. Upon cessation of the illumination, the first FET (5) is blocked while the second FET (6) is driven to be conducting. Hence, the C.sub.GS of the power FET is discharged and the power FET is blocked.

REFERENCES:
patent: 4268843 (1981-05-01), Brown et al.
patent: 4390790 (1983-06-01), Rodriquez
patent: 4647794 (1987-03-01), Guajardo
patent: 4665316 (1987-05-01), Hodges
patent: 4754175 (1988-06-01), Kobayashi et al.
patent: 4755697 (1988-07-01), Kinzer
patent: 4777387 (1988-10-01), Collins
patent: 4801822 (1989-01-01), Idaka et al.

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