Active power line conditioner having capability for rejection of common-mode disturbances
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Aug 19, 1993
filing date -
Aug 19, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an APLC which has improved common-mode disturbance rejection capability when compared with similarly-sized devices constructed according to current teachings. The need for an isolation transformer is, in many cases, eliminated by the invention. The invention alters the coupling transformer of the series parallel APLC or the isolation inductor of the newly-proposed inductor-parallel APLC to create a balun effect in the high and low conductors of the electrical supply network. Particularly, first and second windings are substituted for the single winding of the transformer primary or the isolation inductor. These two windings are serially-connected on the high and low conductors, respectively, with appropriate polarity such that self-inductance values of each are additive. Low pass capacitors and surge protectors may also be added to further protect the APLC and the load.
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