三种服务器电源系统的比较分析  

Comparison of Three Server Power Supply System

作　　者：李冬[1] 阮新波[1] 

机构地区：[1]南京航空航天大学,江苏省南京市210016

出　　处：《中国电机工程学报》2006年第13期68-73,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50177013)。~~

摘　　要：全球输入电压范围的服务器电源系统由功率因数校正级(PFC)和DC-DC级组成。为了提高PFC级在低压输入时的效率,可以适当降低其输出电压。此时在整个输入电压范围内母线电压的变化较大,后级变换器的拓扑选择和设计就显得尤为重要。复合式全桥三电平变换器(HFB TL)的特点是功率器件电压应力低,环流能量少和输出滤波电感小,适用于宽输入电压范围。该文从器件应力,磁性元件尺寸和损耗分布三方面比较了传统的移相控制全桥变换器(PS FB)和HFB TL变换器。并与PFC级变换器组合,构成三种服务器电源的整机方案。最后研制三台原理样机,对三种整机方案均进行了实验比较。Server power supply with universal input is composed of power factor correction （PFC） stage and DC-DC stage. The loss of the PFC stage is large at low line when bus voltage is regulated at 380V. Variable bus voltage （200V-400V） is proposed to improve the efficiency of PFC stage at low line. Then the hybrid full-bridge three-level （HFB TL） converter is used as the DC-DC stage for the wide input voltage range. The merits of this converter are low voltage stress of power semiconductor, small circulating energy and output filter inductor. The features of proposed power supply system are compared with the conventional constant bus voltage system. The prototypes of three power supply system architectures are built up to verify the analysis.

关 键 词：功率因数校正 变母线电压 三电平 全桥变换器 

分 类 号：TM910[电气工程—电力电子与电力传动]