问题点:半桥上臂的驱动波形不好,且传导到输出二极管上的波形也不好,影响了效率.目前整机效率90%,不带PFC.参数如下:
1.输入320V,输出24V
2.变压器参数Lp:480uH,Lk:90uH
3.Cr:33nF/630V
经查IC并未到干扰,因为这种线路初次调试,故请有经验的同仁予以协助.附次级输出二极管电压波形图(探针地接地,正接在二极管前.
空载时的频率为90KHz,满载时为75KHz左右.
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