Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1993-11-30
1996-09-03
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
324117R, H02M 324, G01R 3300
Patent
active
055529798
ABSTRACT:
Current in a line is measured by passing it through a coil, having at least one turn, linking a small high permeability core; passing a measuring current through a bucking winding around the same core; and controlling the measuring current to buck the magnetomotive force of the line current so that the core flux stays below the saturation level. The measuring current may flow through a precision resistor so that a voltage across the resistor is an accurate measure of the line current. The measuring current is obtained from a high frequency switching circuit which senses the change of flux in the core. In normal operation the circuit switches when the core flux has risen to a predetermined value, such as 60% or 80% of the saturation value. If drift or extreme transients cause the flux to reach the saturation level, a sensing and correction circuit re-establishes operation between the desired points.
REFERENCES:
patent: 4276510 (1981-06-01), Tompkins et al.
patent: 4584635 (1986-04-01), MacInnis et al.
patent: 4899103 (1990-02-01), Katzenstein
patent: 4914383 (1990-04-01), Wilkerson
patent: 5053695 (1991-11-01), Canter
patent: 5196784 (1993-03-01), Estes Jr.
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IEEE Transactions on Power Electronics, vol. 8, No. 1, Jan. 1993 "Magnetic Current Sensors for Space Station Freedom" by Craig Sullender, pp. 69-75.
IEEE Transactions on Magnetics, vol. 24, No. 6, Nov. 1988, "Current Sensors with a Small Saturable Core and MOSFETS" by K. Harada & H. Sakamoto, pp. 2910-2912.
Caldeira Paulo P.
DiVincenzo Gregory T.
Gu Wen-Jian
Franzblau Bernard
Nguyen Matthew V.
Philips Electronics North America Corporation
Treacy David R.
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