Method and apparatus for detecting and compensating measurement errors due to transformer saturation in a meter
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United States of America Patent
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Mar 7, 2017
Grant Date -
Jan 7, 2016
app pub date -
Jul 6, 2015
filing date -
Jul 3, 2014
priority date (Note) -
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Abstract
A current measurement circuit includes an integrator, first and second transformers, and a current measurement unit. The first transformer includes a first winding about a magnetic core. The magnetic core has an opening through which a current to be measured passes. The first winding is configured to generate a first current based on a first flux in the magnetic core. The second transformer includes second and third windings. The second winding is coupled to receive the first current from the first winding. The second winding has a terminal coupled to the third winding. The third winding is coupled to a first input of the integrator circuit. The output of the integrator circuit is operably coupled to provide an error current to the second transformer. The current measurement unit measures the current through the second winding of the second transformer.
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