一种多路输入高升压Boost变换器

针对光伏发电系统模块多、输出电压低等问题,提出了一种多路输入高升压Boost变换器。首先分析了2路输入高升压Boost变换器的工作原理及性能特点,然后通过拓扑推演,得到了n路输入高升压Boost变换器。在此基础上搭建了输出功率为100 W的实验样机,实验结果表明:n路输入电压平衡时,输出电压与输入电压之比是Boost变换器的n倍;控制简单,无论各个输入电压源电压相等与否,均可以通过一套控制系统实现输出电压恒定;开关器件电压应力低,可以选择额定电压低的器件,有利于提高变换器效率。

High Step-up Boost Converter with Multiple-input

Directed towards problems that there are too many photovoltaic modules and the output voltages of them are relative low in the typical photovoltaic grid-connected power system,a non-isolated high step-up Boost converter with multiple-input was proposed in this paper.Firstly,the derivation of the converter with dual input was presented and its operation principle and steady state performance were analyzed in detail.Secondly,the n-input high step-up Boost converter made up of n Boost cells was deduced.Finally,an experimental prototype rated 100 W was built and the experimental results were given.The result has showed that: First,If input voltage balancing,the voltage gain is n times of the basic Boost converter,where n is the number of input port.Second,output voltage can be controlled without more control than basic Boost converter.Third,the voltage stress is lower than basic Boost converter and lower voltage MOSFET can be used,and the converter efficiency can be increased further.