新型高功率因数三相AC—DC变换器的研究

提出一种新型高功率因数三相AC－DC变换器，由一个同步变压器（LIT）、两个三相二极管整流器、一个脉冲宽度调制（PWM）DC－DC变换器组成，输入变换器的交流电流频率固定且不连续，排除了三次、五次、七次谐波。通过LIT和平衡电抗器的电流是高频的，变压器可用小铁芯，分析了其电路拓扑结构、工作原理、并给出实验结果。

Study of a New HighPowerFactor ThreePhase ACDC Converter

This paper proposes a new high-power-factor three-phase AC-DC converter, which is composed of a line interphase transformer (LIT) and two three-phase diode rectifiers, followed by a pulse width modulation (PWM) DC-DC boost converter. The active switch of the boost converter is gated at a constant frequency so that the AC input current is discontinuous. This procedure provides an input current shaping without the third, fifth, and seventh harmonics. The current that flows through the LIT and boost inductors has such a high frequency,and ferrite cores of a small size can be utilized in transformer. This paper analyzes it s circuit topological structure , principle of operation , and gives experimental result.