| 摘要 |
A synchronous rectifying apparatus suitable for use in a forward synchronous converter having a transforming unit with a primary and secondary side, and a first and second rectifying switches coupled to the secondary side is provided. The synchronous rectifying apparatus has a condition detecting unit and a synchronous rectifying controller. The condition detecting unit; coupled to the secondary side of the transforming unit, for detecting if the operation condition of the forward synchronous converter is at boundary between discontinuous current mode and continuous current mode or under discontinuous current mode based on the rising slope of the secondary side voltage of the transforming unit. If so, the condition detecting unit outputs a reset signal. The synchronous rectifying controller, coupled to the secondary side of the transforming unit and the condition detecting unit, to turn off the second rectifying switch for a predetermined time period in response to the reset signal.
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