Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1976-06-21
1977-06-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
250551, 330 59, G01R 3100
Patent
active
040328430
ABSTRACT:
A device for coupling a signal value out of a circuit which itself is floating at some relatively high voltage (termed common-mode voltage). A sensor for converting the parameter to be measured to a signal voltage, together with an amplifier and light-emitting diode are powered by a floating power supply of minimal power rating at the location of the common-mode voltage. An optical fiber link, which itself has great electrical insulation characteristics, joins the LED with a solid state light-to-electric transducer at a relatively remote location. Circuit means responsive to the light-to-electric transducer are included for outputting an analog value representative of the quantity to be measured at the point of the common-mode voltage. This LED, fiber optic link and light-to-electric transducer constitute a first OCI (optically coupled isolator). An additional OCI having the same characteristics as the first is located at the remote point and includes a second LED, optical fiber linked and a second light-to-electric transducer which generates a signal representative only of the extraneous variations produced through the first OCI. The resulting signal is differentially added as a feedback term to the signal produced by the first OCI to provide a compensated analog signal output.
REFERENCES:
patent: 3854089 (1974-12-01), Emler
patent: 3943367 (1976-03-01), Baker
International Telephone and Telegraph Corporation
Krawczewicz Stanley T.
O'Neil William T.
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