Fault detection system
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United States of America Patent
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-
May 16, 2006
Grant Date -
Nov 4, 2004
app pub date -
Jun 1, 2004
filing date -
Oct 22, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fault detection system detecting malfunctions or deteriorations, which may result in an inverter fault, is provided. The system has a temperature sensor installed on a semiconductor module to monitor a temperature rise rate. It is judged that an abnormal condition has occurred if the thermal resistance is increased by the deterioration of a soldering layer of the semiconductor module or by drive circuit malfunctions and, as a result, the relation between an operation mode and the temperature rise rate falls outside a predetermined range.
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