不知道是不是佚的問題,你可以試試看!!作者: cicixu 時間: 2009-12-1 02:37 PM
電感電流的震盪,產生這種情況原因可能比較多,補償、消隱時間、最大占空比限制等等作者: happybull 時間: 2009-12-7 11:57 AM
補償或Solp compesation or 电流检测电路 都可能.
测试方法:
1. output cap double or tripple,re run simulation to see if it happens again . This is to check stability.
2. Or inductor value double, re run simulation to see if better , also monitor current sense output signal, see if it is proportional to inductor current. This is to check slop comp and current sense.
Also I assume that you are in FPWM mode so that current can go negative. Make sure that you have NLIM protection.作者: wdfman 時間: 2009-12-16 09:30 PM
这个波形就是典型的低频纹波现象,与EA及其补偿没有关系,其原因有2:
1、电感电流反向时的检测不够迅速;
2、斜率补偿不够,如果加大电感,仿真会看到这个现象有所改善。作者: patrick02046 時間: 2011-3-20 12:51 AM
首先必須確認電路要工作在CCM DCM QCM(類似VRM的控制,將電感電流放到負).