Direct current sensor

Details Direct current sensor Direct current sensor

1994-04-25

1996-04-16

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 361 45, 348627, 307416, 307417, 307418, G01R 3300

Patent

active

055086063

ABSTRACT:
Direct current can be measured by passing a conductor carrying the current through the core of a toroidal transformer having a bias winding and a sensing winding. A pulse generator send pulses of magnetization current through the sensing winding so that the magnetization current produces a magnetic flux in the core which opposes a magnetic flux produced by the direct current carried by the conductor. A sensing circuit, connected to the sensing winding, detects the level of current through that winding to produce a measurement of the direct current carried by the conductor. A constant direct current is applied through the bias winding to increase the magnetic flux produced by the direct current carried by the conductor. Biasing the magnetic flux enables even small currents flowing through the conductor to be measured. Another version of the current sensor uses two transformers to measure direct current flowing in either direction in the conductor and provides an indication of that current's polarity.

REFERENCES:
patent: 3396338 (1968-08-01), Buchanan et al.
patent: 3467864 (1969-09-01), Vander Plaats
patent: 4255705 (1981-03-01), Milkovic
patent: 4320433 (1982-03-01), Yamaki
patent: 4454533 (1984-06-01), Iwasaki
patent: 5008612 (1991-04-01), Otto
patent: 5309086 (1994-05-01), Johansson et al.
Paper entitled "Improving and Simplifying HF DC Current Sensors," by Rudolf Severns, Springtime Inc., 1986.

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