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               當前位置首頁>>技術中心

            技術資料

            直流電源適配器的作用和發展趨勢

              直流電源適配器是一種給網絡延長器、路由器、通信設備、手機、手提電腦和PSP充電和使用的電源適配器。由于手提電腦和PSP內部元器件使用的是都直流電,而我們的生活用電又是交流電,所以必須有一種可以使生活用電轉換為直流電來給電腦和PSP供電。直流電源適配器就是在這種情況下誕生的。

              常見的交流電源適配器(以下簡稱交流電源)外表通常都會配以AC的符號,直流電源適配器(以下簡稱直流電源)則是DC。交流適配器的內部主要是通過電源變壓器來完成轉換輸出,直流適配器內部則是通過整流電路組成的。目前路由器上常見的交流電源適配器內部都有一個銅芯(線包)。工作時,功耗會以無用功的形式損耗掉,線包電源輸入電壓范圍很狹窄,不能適應多種使用環境。而常見的直流電源是適配器(如手機充電器,也稱直流開關電源)內部則是通過整流IC芯片加濾波電路構成,損耗會低很多。

              他們的區別在于:

              1. 同樣9V 500mA輸出規格的直流開關電源和交流線包電源。可以看見,在空載的情況下,直流電源的功率損耗只有0.49W,而交流電源卻達到了1.59W。兩者相差了1.59 - 0.49 = 1.1W。交流電源的空載損耗是直流電源的1.59 / 0.49 = 3.24倍!

              直流開關輸出電源,空載只有0.49W:

              交流線包輸出電源,空載達到了1.59W:

              2. 接上測試的無線路由器,我們可以看見,這種差距在繼續地擴大,直流電源加上路由器的整體功耗只有4.59W,而交流電源接上路由器之后卻達到了6.06W。6.06 – 4.59 = 1.47W。相比于空載的1.1W。而且如果機器本身的功耗增加,這種差距也會進一步繼續擴大。

              接上路由器的直流電源,整體功耗只有4.59W。

              交流電源加上路由器,總體的功耗已經達到了6.06W。

              由此可見,在相同功率的情況下,開關直流電源具有體積小,重量輕,低損耗,功率密度大等優點。特別是開關電源本身具有輸入電壓寬,穩壓精度高,過流過壓、短路保護等功能。正是因為具有上述優點,所以現在大多數的電子產品電源適配器方案都采用直流開關電源輸出。

              隨著通信技術的不斷發展進步,通信機型研究和通信設備工程應用實踐對電源適配器的需求逐年增多,對其精度、性能、規格、品種、類型、體積等方面都提出了許多新的要求,現有的高壓直流電源已經不能滿足通信領域中的許多需要,研究和開發適合通信領域要求的多種新型電源適配器已經成為一種客觀需求,而且其社會效益和經濟效益都比較顯著,市場前景比較光明。




              更新時間:2012-12-05  【打印此頁】  【關閉

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