Active-clamp current-source push-pull DC-DC converter
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United States of America Patent
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Aug 11, 2009
Grant Date -
Oct 25, 2007
app pub date -
Aug 24, 2006
filing date -
Apr 19, 2006
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Abstract
Provided is a current-source push-pull DC-DC converter using an active clamp circuit for reusing energy of leakage inductances by not only diodes on a secondary side of a transformer being zero-current switched using a series-resonant full-wave rectifier, but also the active clamp circuit on a primary side of the transformer, which provides a discharge path of the energy stored in the leakage inductances, increases power conversion efficiency even for a wide input voltage range and reduces a switch voltage stress as compared to a conventional current-source push-pull circuit by operating even for a duty ratio below 0.5 by flowing a current of an input inductor through capacitors of the active clamp circuit when both main switches are off.
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