公开(公告)号：EP1478076A1

公开(公告)日：2004-11-17

申请号：EP03704172.0

申请日：2003-01-28

申请人： Emerson Network Power Co., Ltd.

发明人： YANG, Yong, No.1 Kefa Road ,  HUANG, Chuandong, No.1 Kefa Road ,  LI, Jianfei, No.1 Kefa Road

IPC分类号： H02J7/00

CPC分类号： H02M1/4208 ,  H02J9/00 ,  Y02B70/126 ,  Y02P80/112 ,  Y10T307/516 ,  Y10T307/625

摘要： This invention relates to a PFC circuit for an uninterrupted power supply. Such a PFC circuit includes a first converter, a second converter, an energy storing branch composed of two capacitors in series, and a controller. Each of the first and the second converters has an input terminal and two output terminals. The input terminal is connected with the AC live wire of the commercial power, while the two output terminals of each converter are connected in parallel with the two ends of the energy storing branch, with the parallel joints acting as the output terminal of the positive and the negative voltages respectively. The common nod of the two capacitors in series serves as the common output terminal of the positive and the negative voltages, and it is connected with the neutral of the commercial power. By controlling the switch transistors of the first and the second converters, the controller allows the first and the second converters to output the positive and the negative DC voltages respectively, and brings the phase and the waveform of the input voltage of the commercial power and the current to be consistent with each other. The PFC circuit of the invention can be easily connected with a single battery or two batteries. It is capable of realizing AC-to-DC conversion, DC-to-AC conversion and power factor correction, and it is particularly suitable for using in the online UPS.

摘要翻译： 本发明涉及一种用于不间断电源的PFC电路。 这种PFC电路包括第一转换器，第二转换器，由串联的两个电容器组成的储能分支和控制器。 第一和第二转换器中的每一个具有输入端子和两个输出端子。 输入端子与商用电源的交流输电线相连，而每个转换器的两个输出端子与储能分支的两端并联连接，并联接点作为正极的输出端子， 负电压。 串联的两个电容器的常见点是正电压和负电压的公共输出端，并与商用电源的中性点相连。 通过控制第一和第二转换器的开关晶体管，控制器允许第一和第二转换器分别输出正和负的直流电压，并且使商用电源的输入电压的相位和波形和 目前要相互保持一致。 本发明的PFC电路可以容易地与单个电池或两个电池连接。 它能够实现AC到DC转换，DC到AC转换和功率因数校正，特别适用于在线UPS。