Method and apparatus for limiting motor current
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United States of America Patent
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Dec 13, 1994
Grant Date -
N/A
app pub date -
Dec 29, 1992
filing date -
Dec 29, 1992
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A method and apparatus for limiting current through a switching device supplying current to a load. A control evaluates a model representing the switching device temperature as a nonlinear function of current and time. The model compares the temperature of the switching device to a maximum allowable temperature. The current limit is defaulted to peak current; and in response to the model detecting a temperature in excess of the maximum allowable temperature, a nominal current limit is set. The current limit reset to peak current after the model detects a switching device temperature a predetermined magnitude below the maximum allowable temperature.
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