Drive circuit for semiconductor element
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United States of America Patent
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May 24, 2011
Grant Date -
Sep 16, 2010
app pub date -
Apr 4, 2007
filing date -
Apr 6, 2006
priority date (Note) -
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Abstract
A drive circuit wherein any abnormality of a semiconductor element is prevented from being erroneously sensed in a case where a gate “ON” command has entered in a state in which a gate voltage of the semiconductor element has not lowered fully. A detection process for a controlled variable of the semiconductor element is permitted only within a period which corresponds to a controlled variable of the semiconductor element at the time when an “ON” signal has been inputted to a control circuit, and a detected controlled variable which is detected within the period and a comparison controlled variable which is set in correspondence with the controlled variable are compared so as to output an abnormality signal, whereby the semiconductor element is turn-off at a speed lower than in normal turn-off.
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