Research On Improved High-gain DC-DC Converter

With the rapid development of modern science and technology,due to the exploitation and use of traditional fossil energy by humans,serious energy shortages and environmental pollution problems have arisen.Therefore,it is necessary to develop renewable and non-polluting new energy sources such as solar energy and wind energy to replace traditional fossil energy.However,the output voltage of new energy power generation devices is generally very low,which cannot meet the high voltage required for grid-connected inverters.As a step-up device,a high-gain,wide-input DC-DC converter can effectively solve this problem.Therefore,the research of DC-DC converter has become an indispensable part of grid-connected power generation.Has attracted the attention of scholars.Traditional Boost converter is the simplest Boost converter,and many more efficient dc-dc converters with higher gain and lower component stress are derived from this structure.The article first introduces a variety of traditional DC-DC converters,such as step-up,step-down,step-up and step-down,and a simple analysis of these types of converters.This article starting from the traditional converter and combining boost components such as inductors and capacitors,three types of boost DC-DC converters are proposed,which are "Cascaded High-Gain DC-DC converter" and "A New Type of High-Gain DC-DC converter" and "Improved Switching Snductor Boost converter".Compared with the basic step-up DC-DC converter,these three converters have higher voltage gain and lower component stress.For Cascaded High-Gain DC-DC converter,a new type of high-gain DC-DC converters,and Improved Switched-Inductor Boost converter,this paper analyzes the operation modes of the converters in detail,and gives the modal equation according to kirchhoff voltage(current)law.Using the volt-second balance characteristic of the inductor and the ampere-second balance characteristic of the capacitor,various parameters of the converter are calculated.The parameters of several converters with similar structures are compared and analyzed.The results show that the converters has the advantages of high gain and low stress,thecorrectness of the theoretical analysis was verified through simulation and experiments.The three converters proposed in the article are compared and analyzed to summarize their advantages and disadvantages.Finally,the main content and innovation points of this article are summarized,the main research work of the article is discussed in detail,the advantages of innovation points are summarized,and the future work is prospected.