Optical isolator having high voltage isolation and high light fl

Details Optical isolator having high voltage isolation and high light fl Optical isolator having high voltage isolation and high light fl

1989-05-22

1990-12-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

357 19, G02B 2700

Patent

active

049805681

ABSTRACT:
A high voltage optical isolator has a light emitting diode which illuminates a photodetector for conveying a signal by optical means while isolating the input voltage from the output. The LED is spaced from the photodetector by an extension on an opaque reflective light guide around the optical path between the LED and photodetector. The light guide has a transparent silicone resin medium in a light passage between the LED and photodetector. The internal and external portions of the light guide provide elongated crooked paths for enhancing electrical breakdown resistance. The entire optical isolator is packaged in a conventional DIP. Isolation voltages of 5,000 volts or more and enhancement of light flux coupling up to 300% are obtained.

REFERENCES:
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patent: 4160308 (1979-07-01), Courtney et al.
patent: 4237382 (1980-12-01), Thillays
patent: 4284898 (1981-08-01), Felkel et al.
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patent: 4712017 (1987-12-01), Kamasaki
patent: 4745294 (1988-05-01), Kohashi et al.
patent: 4796084 (1989-01-01), Kamasaki et al.

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