| 摘要 |
A synchronous rectification circuit for a DC-DC power converter having a primary drive voltage that remains at a zero voltage level during a portion of the power conduction cycle. The converter includes a primary side circuit, a first secondary side comprising first and second synchronous rectifiers that are adapted to alternately activate in synchronism with non-zero voltage level portions of the conduction cycle, and second secondary side circuit which polarity is reversed with respect to the first secondary side power circuit. The second secondary side circuit comprises first and second switching devices respectively coupled to the activation terminals of the first and second synchronous rectifiers. The first and second synchronous rectifiers have lower activation voltage thresholds than the first and second switching devices such that both the first and second synchronous rectifiers remain acrtivated during a successive zero voltage level portion of the conduction cycle.
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