Technique for reducing rectifier reverse-recovery-related losses in high-voltage high power converters
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United States of America Patent
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Apr 7, 1998
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app pub date -
Jul 11, 1996
filing date -
Jul 11, 1996
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Abstract
A circuit technique that substantially reduces the boost-converter losses caused by the reverse-recovery characteristics of the rectifier is described. The losses are reduced by inserting an inductor in the series path of the boost switch and the rectifier to control the di/dt rate of the rectifier during its turn-off. The energy from the inductor after the boost switch turn-off is returned to the input or delivered to the output via an active snubber. The same technique can be extended to any member of the PWM-converter family.
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