一种高增益低应力DC/DC升压变换器

A High-gain and Low-stress DC/DC Step-up Converter

随着风能、氢能等新能源的开发与利用变得越来越重要,高增益DC/DC变换器得到了广泛研究。此处依据传统Boost变换器的工作原理,构建了同种原理不同结构的新型DC/DC升压变换器,并采用单开关级联技术提高了变换器的升压能力,得到了高增益低应力DC/DC升压变换器。此处理论分析了高增益低应力DC/DC升压变换器的工作原理及电容电压应力,并与传统Boost变换器、传统二次型Boost变换器、Buck-Boost和Boost级联变换器的增益、电容电压应力进行比较。结果显示该变换器具备高增益特性,且拥有更低的电容电压应力,从而有效减小变换器体积,提升变换器功率密度。最后在理论研究的基础上搭建了一台基于SiC功率器件的实验样机,实验结果验证了理论分析的正确性。

With the development and utilization of new energy sources such as wind energy and hydrogen energy becoming more and more important,high-gain DC/DC converters have been extensively studied.According to the working principle of the traditional Boost converter,a new DC/DC step-up converter with the same principle and different structure is constructed.The single-switch cascade technology is used to improve the boosting capability of the converter,and a high-gain and low-stress DC/DC step-up converter is obtained.Theoretically analyzes the working principle and capacitance voltage stress of high-gain and low-stress DC/DC step-up converter,and the gain of traditional Boost converter,quadratic Boost converter,Buck-Boost and Boost cascade converter,capacitor voltage stress is compared.The results show that the converter has high gain characteristics and lower capacitance voltage stress,which effectively reduces the converter volume and increases the converter power density.Finally,an experimental prototype based on SiC power device is built on the basis of theoretical research.The experimental results verify the correctness of the theoretical analysis.