Circuit arrangement for reducing a magnetic unidirectional flux component in the core of a transformer
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United States of America Patent
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Nov 19, 2019
Grant Date -
Mar 22, 2018
app pub date -
Feb 22, 2016
filing date -
Apr 1, 2015
priority date (Note) -
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Abstract
A circuit arrangement for reducing a magnetic unidirectional flux component in a core of a transformer includes a measuring device that provides a sensor signal corresponding to the magnetic unidirectional flux component, a compensation coil magnetically coupled to the core of the transformer, and a semiconductor switching device which is electrically arranged in a current path in series with the compensation coil to feed a current into the compensation coil, such that current is directed opposite the unidirectional flux component, where the semiconductor switching device is controlled via a control signal provided by a controller, and includes an inductive voltage divider having a first impedance component arranged in a current circuit in series with the compensation coil and the semiconductor switching device and a second impedance component arranged in parallel with the semiconductor switching device, where the first impedance component is connected in parallel with a parallel resonant circuit.
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