Accelerated commutation for passive clamp isolated boost converters
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United States of America Patent
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Apr 5, 2005
Grant Date -
Jan 2, 2003
app pub date -
Apr 8, 2002
filing date -
Feb 22, 2001
priority date (Note) -
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Abstract
An efficient and cost effective bidirectional DC/DC converter reduces switch voltage stress via accelerated commutation allowing use of a low-cost passive clamp circuit in boost mode. The converter includes a primary circuit, transformer and secondary circuit. The primary circuit takes the form of a 'full bridge converter,' a 'push-pull converter,' or an 'L-type converter.'. The primary circuit may include a dissipator such as a snubber circuit or small buck converter. A secondary side of the transformer is momentarily shorted by the secondary circuit by, for example, turning on at least two switches in the secondary circuit simultaneously for a minimal calibratable period when a pair of primary circuit controllers turn off to protect the primary circuit switches from voltage spikes during switching conditions.
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