Current leakage reduction circuit
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United States of America Patent
Stats
-
May 23, 1989
Grant Date -
N/A
app pub date -
Dec 28, 1987
filing date -
Dec 28, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An offset current which is 180.degree. out of phase with the leakage current for a motorized bed circuit is created through the use of an additional transformer winding and series resistor which is connected between the neutral conductor and ground conductor. As the circuit is connected in the reverse polarity condition for testing to UL standards, the offset current is injected into the ground conductor which cancels out a portion of the leakage current from the motors to thereby bring it within testing standards. In the normal connection condition, the injected offset current is additive to the leakage current, although the normal leakage current is much less than the reverse polarity connection leakage current so that the overall leakage current in the normal connection condition remains within test standards.
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