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               當前位置首頁>>技術中心

            技術資料

            通信電源中軟開關技術的應用

              通信電源中硬開關是不管開關管上的電壓或電流,強行接通或關斷開關管。當開關管(漏極和源極之間,或者集電極和發射極之間)的電壓及電流較大時,切換開關管,由于開關管狀態間的切換(由導通到截止,或由截止到導通)需要一定的時間,這樣就會造成在開關管狀態切換的某一段時間內,電壓和電流有一個交越區域,這個交越造成的開關管損耗(開關管的切換損耗)隨開關頻率的提高而急速增加。

             


              若是感性負載,在開關晶體管關斷時會感應出尖峰電壓。開關頻率越高,關斷越快,該感應電壓越高。此電壓加在開關器件兩端,容易造成器件擊穿。



              若是容性負載,在開關晶體管導通瞬間的尖峰電流大。因此,當開關晶體管在很高的電壓下接通時,儲存在開關晶體管結電容中的能量將以電流形式全部耗散在該器件內。頻率越高,開通電流尖峰越大,從而會引起開關管的過熱損壞。



              另外,在次級高頻整流回路中的二極管,在由導通變為截止時,有一個反向恢復期,開關晶體管在此期間內接通時,容易產生很大的沖擊電流。顯然頻率越高,該沖擊電流也越大,對開關晶體管的安全運行造成危害。



              最后,做硬開關運用的通信電源中,開關晶體管會產生嚴重的電磁騷擾。隨著頻率的提高和電路中的di/dt和du/dt增大,所產生電磁騷擾也在增大,影響通信電源本身和周圍電子設備的正常工作。



              上述問題嚴重阻礙了開關器件(開關晶體管和高頻整流二極管)工作頻率的提高。近年來開展的軟開關技術研究為克服上述缺陷提供了一條有效的途徑。和硬開關工作原理不同,理想的軟關斷過程是電流先降小到零,電壓在緩慢上升到斷態值,所以關斷損耗近似為零。由于器件關斷前電流已經下降到零,便解決了感性關斷問題。理想的軟開通過程是電壓先降到零,電流在緩慢上升到通態值,所以開通損耗近似為零,器件結電容的電壓也為零,解決了容性開通問題。同時,開通時,二極管反向恢復過程已經結束,因此二極管反向恢復問題不存在。



              軟開關技術還有助于電磁騷擾水平的降低,其原因是開關晶體管在零電壓的情況下導通和在零電流的情況下關斷,同時快恢復二極管也是軟關斷的,這可以明顯減小功率器件的di/dt和du/dt,從而可以減小電磁干擾的電平,使得通信電源可以很好的應用于通信機房!詳看廣州光橋通信設備有限公司電源部官網!



              一般來說軟開關的效率較高(因為沒有切換損);操作頻率較高,PFC或變壓器體積可以減少,所以通信電源的體積可以做到更小。但成本也相對較高,設計較復雜。

             

              廣州光橋是專業的電源生產廠家,多年研發,生產,銷售通信電源,通信電源系統,逆變電源經驗,公司通過ISO9001認證,質量保證,價格優惠.如想進一步了解產品參數,請登錄www.www.zhongzebengye.com進行瀏覽,或致電免費熱線電話:400-800-6032

             




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