Photocoupler circuit having DC power source in series with detec

Details Photocoupler circuit having DC power source in series with detec Photocoupler circuit having DC power source in series with detec

1990-01-17

1991-08-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02P 2700

Patent

active

050435876

ABSTRACT:
Provided is an enhanced switching speed photo-coupler circuit for providing an output signal in response to an isolated input signal. The photocoupler is comprised of a phototransistor which operates in the active region in response to an applied input signal. A switching transistor connected to the output of the phototransistor is turned on when the phototransistor enters the active region. An output signal, measured from the collector of the switching transistor, will change only slightly in comparison with the off state. In one embodiment, a power semiconductor is coupled to the circuit output for enhanced switching speed.

REFERENCES:
patent: 3767978 (1973-10-01), Wernli
patent: 4021683 (1977-05-01), Splatt
patent: 4027228 (1977-05-01), Collins
patent: 4137428 (1979-01-01), Federico et al.
patent: 4143187 (1979-03-01), Biggs
patent: 4355237 (1982-10-01), Harris, Jr.
patent: 4369371 (1983-01-01), Hara et al.
patent: 4568838 (1986-02-01), Honda et al.
patent: 4629901 (1986-12-01), Nishizawa

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