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新聞資訊

硬開關和軟開關DC-DC轉換器的區別

   按照開關管的開關條件,DC-DC轉換器又可以分為硬開關和軟開關兩種。
  硬開關DC-DC轉換器的開關器件是在承受電壓或流過電流的情況下,開通或關斷電路的,因此在開通或關斷過程中將會產生較大的交疊損耗,即所謂的開關損耗。當轉換器的工作狀態一定時開關損耗也是一定的,而且開關頻率越高,開關損耗越大,同時在開關過程中還會激起電路分布電感和寄生 電容的振蕩,帶來附加損耗,因此,硬開關DC/DC轉換器的開關頻率不能太高。
  軟開關DC-DC轉換器的開關管,在開通或關斷過程中,或是加于其上的電壓為零,即零電壓開關,或是通過開關管的電流為零,即零電流開關。這種軟開關方式可以顯著地減小開關損耗,以及開關過程中激起的振蕩,使開關頻率可以大幅度提高,為轉換器的小型化和模塊化創造了條件。


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