[求助]2V600A全桥+倍流整流不平衡的问题

电源工作条件:电压输入220VAC.
              全桥工作方式.
              3895驱动,100KHz.
              变压器EE65,13:1.
              输出整流:倍流整流.
              输出要求:2V600A.
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具体参数:输出电感:2uH,Lr:2uH.输出整流管MBR30045CT(DACO300A45V肖特基管2*2只)
电源输出大到一定功率时就会出现500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/40/1145927868.gif');}" onmousewheel="return imgzoom(this);">
(紫色和绿色为全桥桥臂中点波形,红色为差分值)

输出开路时原边波形很对称,但工作时输出就不对称了.
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(紫色和绿色为变压器两端电压,红色为变压器输出电压)

同样两个输出电感两端的电压也不对称,上传一张输出波形
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最后在上传一张输出整流二极管的波形图.
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(该图为一边的另一边的波形接近但电平和相位不同)