Motor driving device and method of protecting motor driving device
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United States of America Patent
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Aug 11, 2015
Grant Date -
Mar 6, 2014
app pub date -
Jul 3, 2013
filing date -
Aug 28, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A motor driving device includes a motor driving circuit, an element temperature sensor, a control circuit, an ambient-temperature estimator, and an overheat protection processor. The motor driving circuit has a plurality of switching elements. The element temperature sensor is configured to detect a temperature of each of the switching elements. The ambient-temperature estimator is configured to estimate an ambient temperature around the control circuit based on a temperature of at least one of the switching elements detected by the element temperature sensor if the at least one of the switching elements is not performing the switching operation. The overheat protection processor is configured to execute a first overheat protection process to protect the control circuit from overheating if the ambient temperature around the control circuit estimated by the ambient-temperature estimator exceeds a first overheat criterion temperature.
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