Detector circuit to be used for measuring current
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United States of America Patent
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Jun 17, 2008
Grant Date -
Jun 28, 2007
app pub date -
Nov 26, 2004
filing date -
Nov 27, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A detector circuit is to be used for measuring current by means of substantially identically wound ring core transformers, in which magnetomotive forces are induced by a main current. The magnetomotive forces are counteracted by magnetomotive forces induced by a compensating current. Two of the ring core transformers (2, 3) are magnetized in antiphase by means of a modulation signal. The detector circuit includes optionally a synchronous rectifier for providing an adjusting signal for the compensating current. According to the invention means are provided for compensating for possible differences between the two ring core transformers for the modulation signal. These means include a cornmon winding surrounding the two ring cores (2, 3), said common winding detecting a possible error signal used in a negative feedback loop which automatically seeks to establish an equilibrium.
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