近来在设计有源PFC电路,不知选择升压还是降压,还请高手指点。
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降压的主要特点就是BUS的电压比boost的要低,这样的话,DCDC的拓扑MOS可以使用较低电压的MOS,后级效率可以做高。但是只要输入大于BUS才工作,PF值较Boost低