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开关电源都有哪些拓扑结构？
各个结构都适用哪些场合？
这个话题可就大了去了，一般用的比较多的是反激、单管正激、双管正激、推挽、半桥、全桥。。。。。，象全桥又分成硬开关、移相软开关、LLC谐振软开关等，具体的内容建议首先阅读一些电源相关书籍。
