一种双极性输出的高增益变换器  

A high gain converter with bipolar outputs

作　　者：郑贞钰 陈思 国梦珠 李炀 ZHENG Zhenyu;CHEN Si;GUO Mengzhu;LI Yang(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443000

出　　处：《现代电子技术》2024年第22期107-112,共6页Modern Electronics Technique

摘　　要：随着分布式能源高渗透率接入电网,双极性直流微电网固有优势愈发突出。针对光伏电池投入到双极性直流微电网运行时,对于高增益双极性变换器的需求,提出一种组合式且可提供双极性输出的高增益变换器。在传统Sepic变换器的基础上加入一个二极管和电容,通过开关管控制电容、电感能量的交替传递,从而提升变压器增益;其次,基于元件复用的方法将开关电容单元和Boost电路进行组合,实现正负极电压均衡的双极性输出。此外,详细阐述了所提变换器的工作原理,开关器件的电流和电压应力、电路参数设计。为验证所提拓扑结构的可行性,搭建了一台24 V/336 V(±168 V)、112 W的实验样机,实测变换器增益可达14倍。实验结果表明,所提变换器具有增益高、器件电压应力低、输入电流连续的特点。With the high penetration of distributed energy sources into the power grid,the inherent advantages of bipolar DC microgrids are becoming more and more prominent.In allusion to the demand for high-gain bipolar converters when photovoltaic cells are put into the operation of bipolar DC microgrids,a combined and high-gain converter that can provide bipolar output is proposed.On the basis of the traditional Sepic converter,the diode and capacitor are added to control the alternating transfer of energy between the capacitor and inductor by switching tubes,thereby improving the transformer gain.The switched-capacitor unit and Boost circuit are combined based on the method of component multiplexing to realize the bipolar output with balanced voltage at positive and negative poles.The operating principle of the proposed converter,the current and voltage stresses of the switching devices and the design of the circuit parameters are specified.In order to verify the feasibility of the proposed topology,a 24 V/336 V(±168 V),112 W experimental prototype is built and the measured converter gain is up to 14 times.The experimental results show that the proposed converter has the characteristics of high gain,low device voltage stress,and continuous input current.

关 键 词：高增益变换器 双极性输出 低电压应力 开关电容 电压增益 拓扑结构 

分 类 号：TN624-34[电子电信—电路与系统] TM46[电气工程—电器]