在做全电压驱动的镇流器时,PFC-MOS驱动波形怪异,电压越高越严重,大家看下面的图.
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上面图是120V时MOS G脚实测驱动波形的上升沿,有一个尖峰过渡沿,我测过PHILIPS的波形,上升沿很干净,直线上升,没有这种现象的.不解.都是用L6561做90-270V全电压驱动,MOS管ST11NM60C,G脚电阻10欧,输出功率100W.PFC电感用两个E25并联,并后0.75mH.线路都是基本的.
是驱动过冲吗?
还是干扰?
还是线路有问题?
请大家能帮忙.
下面是220V和270V测的波形,更严重.
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