用新的總線轉(zhuǎn)換模塊升級IBA板

　　分布式電源架構（DPA）是流行在現(xiàn)代電信和數(shù)據(jù)通信設備，以及在數(shù)據(jù)中心的服務器。DPA拓撲傳統(tǒng)上使用一個前端AC/DC轉(zhuǎn)換器模塊，該模塊從交流電源產(chǎn)生高壓直流輸出。設計者通常更喜歡中間總線結構（IBA），因為要有效地將前端高直流電壓（通常為48 V）轉(zhuǎn)換為負載點所需的低電壓，以在系統(tǒng)板上驅(qū)動電子負載。基于IBA的電力系統(tǒng)使用一個隔離的dc / dc轉(zhuǎn)換模塊，稱為中間總線轉(zhuǎn)換器（IBC）或簡單總線轉(zhuǎn)換器（圖1），將前端高壓輸入總線轉(zhuǎn)換為中間電平電壓，例如9或12伏直流電壓和更低電平。

　　Figure 1： Intermediate bus architecture （IBA） uses a bus converter to step-down high-voltage distribution bus to an intermediate level DC voltage.

　　The lower intermediate bus voltage makes it easy for system designers to use very efficient， high-density， nonisolated POLs （niPOLs） to further drive microprocessors， memory modules， and other electronic devices on the system boards. Over the years， the bus converter modules used in such IBA schemes have evolved tremendously. These converters now are available in a variety of industry-standard formats – such as open-frame， bricks， and surface-mountable modules – for upgrading the current IBA schemes implemented on system boards. While the majority of bus converter outputs are semi-regulated， some also offer fully regulated outputs.