基于副边谐振技术端反激式变换器EMI分析

doi:10.19595/j.cnki.1000-6753.tces.180106

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摘要

针对传统单端变换器中电压和电流变化率大、电磁干扰严重的问题,研究一种基于副边谐振技术的单端反激式变换器,在应用副边谐振技术后,该变换器谐振电容电压的影响和励磁电感的设计可使开关管电压、电流应力降低,谐振腔的位置设计将整流二极管和谐振二极管的端电压钳位在输出电压,合适大小的谐振周期可以使谐振二极管实现零电流关断。本文分析断续导通模式下副边谐振变换器的噪声耦合路径、等效模型、噪声优化理论。分析结果表明：引入副边谐振技术后,共模噪声源减小,合理设计谐振腔可增大等效阻抗,进一步减小共模电压;相比传统反激变换器,励磁电感设计得更大,从而降低变压器的电流纹波,减小差模噪声。搭建仿真模型和60W实物样机,实验验证了副边谐振技术可以有效降低电磁干扰水平。

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	陈强
	陈章勇
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关键词 ：单端变换器, 软开关技术, 副边谐振, 电磁干扰

Abstract：

Aiming at the problems in traditional single-ended converters, such as large change rate of voltage and current, poor electromagnetic interference (EMI) level, this paper proposes a novel converter applied secondary-resonance-technology in flyback topology. In this converter, voltage stress and current stress are decreased thanks to the effect of resonant capacitor voltage and the design of magnetic inductance. Meanwhile, the voltage stresses of rectifier diode and resonant diode are clamped at the output voltage because of the position of resonant cavity, and the resonant diode can achieve zero current switching (ZCS) for a suitable resonant period. In this paper, the noise coupling path, equivalent model and noise optimization theory of the advised converter are analyzed. The analysis results show that the common mode noise sources are reduced, and the equivalent impedance is increased because of the reasonable design of resonant cavity, which further reduces the common mode voltage. The increase in the transformer excitation inductance reduces the current ripple, thereby reducing the differential mode interference. A simulation model and a 60W physical prototype are built and tested. The experimental results show that the advised converter can receive lower EMI level.

Key words： Single-ended converter soft switching secondary-side resonance electromagnetic interference

收稿日期: 2018-01-19 出版日期: 2019-03-01

PACS:

TM46

基金资助:

国家自然科学基金（51607027）,四川省科技支撑计划（2016GZ0395、2017GZ0391、2017GZ0392）,中央高校基本科研业务费专项资金（ZYGX2016KYQD123）资助项目

作者简介: 陈章勇, 男,1988年生,博士,讲师,研究方向为软开关技术、无桥功率因数校正技术和高增益DC-DC变换器拓扑等。E-mail: zhang_yong_ch@126.com

引用本文:

陈强, 陈章勇, 陈勇. 基于副边谐振技术端反激式变换器EMI分析[J]. 电工技术学报, 2019, 34(4): 728-737. Chen Qiang, Chen Zhangyong, Chen Yong. Electromagnetic Interference Analysis of Single-Ended Fly-Back Converter Based on Secondary-Resonance-Technology. Transactions of China Electrotechnical Society, 2019, 34(4): 728-737.

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通信作者:陈强, 男,1992年生,硕士,研究方向为软开关技术.E-mail: 18200271099@163.com