該演示直流高電壓分布的可行性

　　多年來，我們看到了數據中心的使用激增，以滿足互聯網流量的需求，擴大移動語音/視頻/數據通信，并迅速發展云計算服務。因此，電力消耗已成為這些中心的經濟的主要因素。添加到混合是巨大的壓力，以減少電力損耗和節約能源，這是來自監管機構，如環保局（EPA）和行業協會，如綠色電網。作為回應，工程師們已經采取了多種方法來提高數據中心和電信設施中使用的電力系統的整體效率。

　　這些策略之一涉及使用的高電壓直流（HVDC）總線。400 V（最大）直流電源分配（也稱為一個380 VDC總線）的使用，已獲得業界的支持，有幾個原因。一個主要的吸引力是提高能源鏈的整體能源效率。從系統的觀點來看，研究表明，大約百分之十的能量效率更高，可以采用高壓直流供電相比傳統的ac-to-48 VDC的轉換實現，按照Vicor白皮書”高壓直流分布的關鍵是提高系統的效率和可再生能源的機遇”。1

　　This white paper points out that there are several other factors driving power-electronics designers toward the new 400 VDC topology. For example， unlike AC， DC does not require source synchronization and can draw power from renewable sources like solar and wind. In addition， it does not need phase balancing and harmonics is not an issue. Moreover， most back-up energy sources， such as batteries and flywheels， are inherently DC. Finally， by minimizing power-conversion stages， along with building wiring， copper， and connectors， HVDC offers a lower total cost of ownership （TCO）。

　　In last few years， a number of research labs， including Lawrence Berkeley National Lab and the Intel Labs， as well power supply manufacturers like Vicor have demonstrated the concept and the energy-efficiency benefits of using high-voltage DC-power distribution in data centers and telecom systems （see the TechZone article “High-Voltage DC Distribution Improves Data Center System Efficiency”）。 At the 36th International Communications Energy Conference （INTELEC） in Vancouver， Canada last October， some power supply manufacturers went beyond proof of concept. They demonstrated the viability of adopting HVDC power distribution in data centers and telecom plants， including buildings.