摘要
提出一种基于三电平结构的多电平级联Boost直流变换器,采用模块化及相应载波移相调制技术,使该变换器可以灵活用于高频隔离型高压直流变换器前端及高频隔离型高压PFC中间级。基本的三电平模块是由P-cell,N-cell单元构造而成,并且能够提供2个相同输出电压同时获得1倍于开关频率的等效频率。首先详细分析了多电平级联Boost DC-DC变换器在载波移相调制下的电路工作原理及电感电流与电容电压波纹特性,并讨论出不同占空比下的输入输出电压关系以及电感电流的趋势。最后,搭建功率5.3 k W的实验装置来验证多电平级联Boost变换器的工作特性。
A new cascade multilevel boost converter topology was presented based on the basic three-level DC-DC converter in series for the higher voltage level, which can be used in the front-end converter of high-frequency isolation high-voltage DC converter and the intermediate power conversion of high-frequency isolation high-voltage PFC. The proposed multilevel boost converter is easily modulated with phase-shift control and can flexibly match different input-voltage level. The basic module can be described based on P-cell and N-cell concept offering the two equal output voltages and two times of the real-switching frequency. The operating principle of the proposed cascade boost converter was analyzed in detail with the phase-shift switching scheme including the performance of the inductor current and capacitor voltage ripples. And the relationship between the input and output voltage under the different duty ratio was discussed getting the variation tendency of the inductor current. Finally, a 5.3 kW experimental system was built to verify the proposed the performance characteristic of the cascade boost converter.
出处
《电气传动》
北大核心
2016年第4期30-36,共7页
Electric Drive
基金
国家自然科学基金(51307021)
吉林省自然科学基金(20140101076JC)
