Load control system having an overload protection circuit
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
Jun 21, 1999
filing date -
Jun 21, 1999
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A load control circuit having an overload circuit capable of protecting a switching element from overload conditions over a wide range of operating conditions. The overload circuit limits the maximum average power dissipation of the switching element in accordance with a comparison of an average voltage across the switching element over a half-cycle and a variable threshold. The variable threshold is determined based on an ON-state resistance of the switching element and the environment in which the switching elements are operating. The variable threshold accounts for the squared term (V.sup.2 or I.sup.2) in determining power dissipation and allows power to be determined based on average voltage.
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