一种新型的CCMPFC软开关技术研究.pdfVIP

学兔兔 总第49卷 第554期 电测与仪表 Vo1．49 No．554 2012年 第2期 Eleetrical Measurement Instrumentation Feb．2012 一 种新型的CCM PFC软开关技术研究 柴玉华，苑志刚，刘伟丽 (东北农业大学工程学院，哈尔滨150030) 摘要：为降低电源设备对电网的谐波污染，功率因数校正技术已被广泛应用于电力电子设备中，且绝大多数PFC 采用Boost电路。在中等及以上功率等级时PFC常采用电流连续模式，而功率二极管由于存在反向恢复特性，开 关管的开通损耗被大大增加，电磁干扰加重。本文提出了一种新的无源无损缓冲电路，其能够抑制二极管的反 向恢复特性，减小开关管的开通损耗。新电路的加入未引入开关管额外的电压应力，电路结构简单，软开关实现 范围大，500 W实验样机验证了PFC效率能被大大提高。 关键词：功率因数校正；Boost电路；电流连续模式；软开关 中图分类号：TM461 文献标识码：A 文章编号：1001—1390(2012)02—0090—03 Research on CCM PFC Soft Switching Technology CHAI Yu-hua，YUAN Zhi-gang，LIU Wei-li (College of Engineering，Northeast Agricultural University，Harbin 150030，China) Abstract：Power factor correction technology has been widely used in power electronic applications to reduce the harmonic pollution on power grids．Boost converter is the most popular alternative．In the medium or greater power ratings，the continuous current mode is adopted usually．However，the reverse recovery characteristic of power diode enlarges the switch turning-on loss and the electromagnetic interference is aggravated also．In this paper，a novel passive lossless snubber is proposed．It could solve the above issues．The adding of this snubber does not introduce the extra voltage stress to the switch．It has simple circuit structure and soft switching conditions are satisfied easily． The 500W prototype validates that the efficiency of PFC is improved greatly． Keywords：power factor correction，Boost converter，current continuous mode，soft switching 0 引 言 路的复杂程度。除此之外还可采用SIC--极管，但其过 现代电力电子变换