【作者】 吴慎山； 李美凤；

【Author】 WU Shen shan Li Mei Feng

【机构】 河南师范大学物理与信息工程学院；

【摘要】 介绍了开关电源的基本工作原理,分析了其产生电磁干扰(EMI)的原因及其造成的危害,给出了几种抑制其谐波干扰的方法,如:滤波、屏蔽、接地技术等。重点研究了软开关技术,PFC主电路采用无损吸收缓冲网络,使开关管实现了零电流开通和零电压关断。通过对其开关管工作原理的分析,说明了此电路在改善电流谐波、降低开关管的开关损耗、提高转换器工作效率方面的突出特点。更多还原

【Abstract】 Introduced the basic work principle of the switch-mode power supply,the sources and harm of electromagnetism interferences was presented as well in this paper,bring forward several approaches to suppress harmonics,eg:EMI filter,shielding,grotmding etc,especially soft-switching technology.Zero current & voltage switch can be realized,where lossless absorbing-circuit is adopted as the main circuit of power factor correction.In order to explain its merits in improving current harmonics and converter efficiency,and decreasing switching loss, analyzed the main principle of the switching-MOSFET.更多还原