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UCC28950移相全桥问题

Other Parts Discussed in Thread: UCC28950

最近在做一个PSFB的电源,输入范围200vdc-400vdc,输出12V/140A的2KW电源,遇到如下问题:
1,用的是UCC28950的控制芯片,主变压器匝比为10:1,谐振电感为7uH,15A,
2,在测试到超过40A负载时,原边电流的负端会发生畸变,负载不变,加大输入电压,同样会产生电流波形的畸变,电压越高,畸变越大,图形如下,麻烦各位高手帮看一下,是什么问题导致。


非常感谢