FLUX-GATE LEAKAGE CURRENT SENSOR
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United States of America Patent
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Issued Date -
Jan 13, 2011
app pub date -
Jul 7, 2010
filing date -
Jul 9, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A flux-gate leakage current sensor includes: an annular core; a coil wound around the core; a driving circuit which applies to the coil a voltage with a positive/negative symmetric rectangular wave so as to saturate a density of a magnetic flux of the coil while reversing a direction of the magnetic flux; a comparator circuit which compares a measured voltage changing according to a coil current flowing in the coil with a positive-side reference voltage and a negative-side reference voltage that are positive/negative symmetric to each other, and outputs a positive-side electric signal corresponding to a period in which the measured voltage is higher than the positive-side reference voltage and a negative-side electric signal corresponding to a period in which the measured voltage is lower than the negative-side reference voltage; and a determination circuit which compares the positive-side electric signal and the negative-side electric signal output from the comparator circuit.
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