Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1989-12-28
1992-03-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
50922721, G02B 2700
Patent
active
050991442
ABSTRACT:
An apparatus for optical power transmission capable of reducing a number of photo cells and improving a power transmission efficiency, and an optically powered system using the apparatus capable of maximizing lifetime of light sources. The apparatus includes an alternating current transformer for transforming the electric power to a desired level for a load. The system further includes a device for detecting magnitude of the electric power, and a device for controlling an amount of light emission by the light source in accordance with the detected magnitude of the electric power such that the magnitude of the electric power to be given to the load is maintained to be substantially constant.
REFERENCES:
patent: 4345482 (1982-08-01), Adolfsson et al.
patent: 4490606 (1984-12-01), Lockett et al.
patent: 4899044 (1990-02-01), Hansen et al.
Paul Bjork et al., "Optically Powered Snsors", OFS'88, ThEE, 1988, pp. 4-1 - 4-4.
Yukio Sai et al., "Optically Powered Sensor Driven by One Si-Solar Cell", SICE '89, Jul. 25-27, JS 54-5, pp. 551-552.
Kabushiki Kaisha Toshiba
Nelms David C.
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