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Buck PFC

您好,关于Buck PFC我有几个问题:

1,贵公司的拓扑电流内环是怎么控制的,我看到你们用的是RS触发电路,起什么作用?

2,对于大功率电路,这种控制是否适合?可否用电流内环的PI控制?

3,对于三相的大功率电路,能否实现,如何实现Buck+PFC?