Current sensor and method using differentially generated feedbac

Details Current sensor and method using differentially generated feedbac Current sensor and method using differentially generated feedbac

1994-08-10

1996-10-22

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324117R, G01R 3300

Patent

active

055680470

ABSTRACT:
A current sensor has one signal interface channel including a transformer having a primary winding, a secondary winding and a feedback winding. A magnetic core magnetically couples the primary winding, the secondary winding and the feedback winding. The current sensor further includes a feedback generating circuit responsive to an AC signal in the secondary winding for generating a feedback signal having a continuous polarity supplied to the feedback winding. The feedback signal being effective for maintaining a flux in the magnetic core substantially near zero. The feedback generating circuit is made up of an operational amplifier, such as an amplifier having first and second differential input ports and first and second differential output ports, and a switching assembly designed to generate a compensating AC signal from a DC offset voltage. The compensating AC signal is conveniently coupled to the operational amplifier through the magnetic core.

REFERENCES:
patent: 3955138 (1976-05-01), Milkovic
patent: 4198595 (1980-04-01), Milkovic
patent: 4482862 (1984-11-01), Leehey
patent: 4500838 (1985-02-01), Bloomer
patent: 4616174 (1986-10-01), Jorgensen
patent: 4761605 (1988-08-01), Jochum
patent: 5066904 (1991-11-01), Bullock
Patent Abstracts of Japan, vol. 15, No. 433 (P-1271) Nov. 5, 1991, pp. 1/1.

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