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UCC2897: 有源钳位正激励磁电流问题

Part Number: UCC2897


我在调试有源钳位正激电源时,用的是上管Nmos方式加主动强制CCM模式同步整流方案,图片中Q7是开关管,Q6是钳位管,Q4是整流管,Q2是续流管。

当开关管关闭到整流管关闭(续流管打开)这段时间内,开关管关闭,整流管没有关闭,续流管体二极管导通,变压器的副变被短路,因此原边的开关管被钳位到输入电压。

求教这段时间内励磁电流是怎么流的?大小是怎么变化的?