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OBC+DC/DC的功耗问题



在OBC+DC/DC的系统框图中,想咨询两个问题:

1、PFC将220V市电升压至380V左右,这个380V可不可以继续升高,为什么?

2、DC/DC的功率为什么集中在1~2.5kW这样的几千瓦的数值,为什么不能再提高了?