Protection circuit and method for an electromagnetic interference suppression system
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United States of America Patent
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Apr 13, 1999
Grant Date -
N/A
app pub date -
Mar 6, 1997
filing date -
Mar 11, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to protection circuit and method for the EMI/RFI suppression system (2) of such a five-conductor electrical system in which the neutral conductor (N) is provided with a bandstop-type filter circuit (2) for the suppression of a harmonic interference current component. According to the invention, on the neutral conductor (N) is placed a current transformer (CT) having over its secondary a resistive branch (R.sub.1), and in parallel therewith, a filter branch (5) comprising a bandpass filter (LC) tuned to the fundamental frequency of said neutral-conductor filter circuit (2) and said filter branch (5) having in series with said bandpass filter branch (LC) a switch element (4) suitable for short-circuiting said neutral-conductor filter circuit (2) when current in said filter branch (5) exceeds a preset upper limit level.
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