Optics: measuring and testing – Photometers – Comparison
Patent
1997-02-03
1998-04-28
Pham, Hao Q.
Optics: measuring and testing
Photometers
Comparison
327 63, 327514, G01J 110
Patent
active
057452334
ABSTRACT:
A voltage detecting circuit is capable of detecting the voltage to be detected at high precision, is small in size, and is low in manufacturing cost. A first photo coupler and a second photo coupler are interposed between voltage input terminals to which the voltage to be detected is applied. The photo coupler has light emitting elements connected parallel reversely, first voltage generator for generating a voltage depending on the photo detector side currents of the first photo coupler and second photo coupler, a differential amplifier whose one input terminal receives the voltage generated by the first voltage generator. A third photo coupler and a fourth photo coupler having light emitting elements are connected parallel reversely for receiving the output current of the differential amplifier, and a second voltage generator for generating a voltage corresponding to the photo detector side currents of the third photo coupler and fourth photo coupler. The voltage generated by the second voltage generator is fed into the other input terminal of the differential amplifier, so that the voltage depending on the light emitting element side currents of the third photo coupler and fourth photo coupler is matched with the voltage fed into the voltage input terminals.
REFERENCES:
patent: 4321487 (1982-03-01), Huykman
patent: 4352998 (1982-10-01), Baker et al.
"Signal Converters 1991", p. 23, Published by Yokogawa Electronics Co., Ltd.
"1991 Products Data Book" pp. 3-11, Published by Burr-Brown Japan. Ltd.
Asada Katsuhiko
Morita Tadashi
Tamaki Atsuhiko
Pham Hao Q.
Tsubakimoto Chain Co.
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