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單端正激變換器的定義及作用?

發表時間:2021-02-25 17:54【 閱讀量:-查看手機網址
掃一掃!單端正激變換器的定義及作用?掃一掃!

  在開關電源中,供電端的電源,經過一個開關管,在開關管導通期,把矩形波加在一專次繞組上,使屬變壓器的一次繞組流過鋸齒波,變壓器磁芯的磁通量也是按鋸齒波增長,此時,在變壓器的二次繞組將有矩形波輸出,把此矩形波輸出經整流二極管和濾波電路輸出,這就是單端正激。如果不是在開關管導通期輸出能量,而是在開關管的導通期積存磁能,在開關管的截止期磁通量下降,在磁通量下降的過程中,變壓器二次繞組感生的電壓,經整流二管和濾波電路輸出,就是單端反激。


  變換器中權輸出電感的作用主要有兩點。1:限制電流。如果沒有輸出電感,當輸出二極管導通時理論上將產生無窮大電流給輸出電容充電。


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