基于开关电容的软开关高电压增益DC-DC变换器.PDFVIP

2018 年 6 月 电 工 技 术 学 报 Vol.33 No. 12 第 33 卷第 12 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Jun. 2018 DOI: 10.19595/j.cnki.1000-6753.tces.170247 基于开关电容的软开关高电压增益 DC-DC 变换器 雷浩东 郝瑞祥 游小杰 项鹏飞 （北京交通大学电气工程学院 北京 100044 ） 摘要 提出一种基于开关电容的具有高电压增益和软开关特性的 DC-DC 变换器拓扑。该拓 扑能够在非极端占空比条件下实现高电压增益，并具有类似于传统 Boost 变换器的PWM 电压调 节能力。通过谐振软开关技术，实现所有开关管的零电压开通和所有二极管的零电流关断，有利 于提高变换器的效率和功率密度。变换器中开关管和二极管承受的电压应力低，允许选择低电压 等级、低导通电阻的器件。详细分析变换器拓扑的基本工作原理，对变换器电压增益特性和软开 关实现条件等稳态工作特性进行研究。最后，搭建一台输入25～40V 、输出400V/1kW 的实验样 机，对理论分析进行实验验证。 关键词：开关电容 高电压增益 谐振电感 软开关 DC-DC 变换器 中图分类号：TM46 Soft-Switching High Voltage Gain DC-DC Converter Based on Switched-Capacitor Lei Haodong Hao Ruixiang You Xiaojie Xiang Pengfei （School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China ） Abstract In this paper, a switched-capacitor based DC-DC converter topology with high voltage gain and soft-switching character is presented. The proposed topology can achieve high voltage gain without operating the switches at extreme duty cycle and has PWM voltage regulation ability similar to conventional Boost converter. Through resonant soft-switching technique, zero-voltage switching (ZVS) turn-on of all switches and zero-current switching (ZCS) turn-off of all diodes are achieved, which is useful to improve the efficiency and power density of the converter. The voltage stresses of switches and diodes are low, so low voltage level and low on-resistance devices can be adopted to reduce the