Single-coil current measuring circuit

Details Single-coil current measuring circuit Single-coil current measuring circuit

1983-04-07

1985-07-16

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 332 12, G01R 1900

Patent

active

045299315

ABSTRACT:
A single-coil wound on a ferrite core surrounding a current path is driven from a voltage controlled constant current source. The coil drive current is modulated with a fixed frequency squarewave. The average voltage present across the coil is sensed and integrated to provide an output signal which is proportional to the current flow and also provides a negative feedback to the voltage controlled current source to bias the modulated drive current in a direction which compensates for the biasing effects of the current flowing in the conductive path.

REFERENCES:
patent: 3801907 (1974-04-01), Lilienstein
patent: 3818337 (1974-06-01), Groenenbroom et al.
patent: 4274052 (1981-06-01), Gentry et al.
patent: 4276510 (1981-06-01), Tompkins et al.
patent: 4278938 (1981-07-01), Morriss

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