Electric current sensing device of the magnetic field compensation type
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United States of America Patent
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Jul 3, 1990
Issued Date -
N/A
app pub date -
Jun 29, 1989
filing date -
Dec 12, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electric current sensing device for measuring a primary current of relatively high intensity. The device includes a magnetic circuit that is coupled with a primary conductor and with a measuring coil that is connected to a current source through an associated control circuit. The magnetic circuit includes an air gap which accommodates a magnetic field detector that is electrically connected to an input of the control circuit for controlling a magnetic field compensating current that is supplied to the measuring coil. The device also includes a printed circuit that is arranged to both minimize electromagnetic interference between the measuring current circuit and the control circuit input, and improves heat dissipation of the printed circuit, thus optimizing the size ratio of the maximum primary current to the bulk of the device and improving performance of the same.
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