Method and apparatus for fault detection of series diodes in rectifiers
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United States of America Patent
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Oct 13, 2015
Grant Date -
Sep 8, 2011
app pub date -
Mar 2, 2011
filing date -
Mar 2, 2010
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Abstract
A method and apparatus for fault detection of series diodes in rectifiers is disclosed, wherein the voltages across one or both of the individual diodes, and/or the voltage across the pair of diodes are measured to determine a ratio between two of those voltages. The ratio is then analyzed to determine if a fault (e.g., a short circuit or an open circuit) is present. In some embodiments, circuitry can be included to compensate for the normal variations in diode characteristics (e.g., reverse leakage current, reverse recovery charge) between the pair of series diodes to minimize the potential for erroneous fault detection.
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