Research And Control Of A Two-winds High Efficiency High Step-up DC-DC Converter Integrated Switched Capacitor

With the proposing of carbon peaking and carbon neutrality goals and the prominent problems of environmental pollution in recent years,the new energy renewable power generation technology has developed rapidly.In order to improve the efficiency and quality of new energy power generation,scholars from all over the world have devoted themselves to the research of related technologies of new energy power generation.In new energy power generation systems such as photovoltaic,wind power generation and so on,DC-DC boost converter is needed to improve the voltage level,so the related high boost DC-DC converter has become a research hotspot in recent years.In order to get better performance,this paper proposed a two-winds high efficiency high step-up DC-DC converter integrated switched capacitor(SCTW)on the premise of learning and summarizing the technology of boost converter and drawing on the merits of various technology.The proposed converter integrated switched capacitor,passive clamping,coupling inductor and other emerging technologies,and has high voltage boost capacity and low energy loss.Its advantages can be summarized as:(1)Using Boost converter as the framework,the proposed converter retains the characteristics of continuous input current and input-output common ground.It is easy to expanding research due to the concise circuit topology and clear division of each module.Moreover,the design of only one switching tube reduces the control difficulty and achieves good closed-loop control effect.(2)The proposed converter has high voltage gain because of the using of switched capacitor and couple inductor technology.(3)The structure has a passive clamping module,which can absorb the leakage energy of the couple inductor and reduce the voltage peak of the switching tube.(4)Existence of turn ratio of the coupled inductors makes the converter adjust voltage gain more flexibly,and adapts to different job requirements.(5)Some diodes achieve zero current switching and zero voltage switching which can reduce the power loss,and so that the converter’s efficiency is high.In this paper,the history of the converter is introduced and the working mode is analyzed in detail.The current,voltage stress,power loss,working efficiency and other data are analyzed by using the corresponding calculation method under the idealized ON and OFF model,and the influence of parasitic parameters on the gain and efficiency is analyzed amply.The excellent performance of the proposed converter is highlighted by reasonable comparison with converters from excellent journal papers.Then the small signal model of SCTW is established by using the controling knowledge.The PID controller is designed to complete the closed-loop control and simulink simulation is used.Combined with the above theoretical research and simulation,the main circuit and auxiliary circuit of the converter are designed,and the hardware required for the experiment is built.Finally,a prototype with rated power of 200 W is finished.We got the experiment data and waveform from the open-loop and closed-loop experiments.From the experiment result we can know that the theoretical analysis is correct and the performance of the converter is pretty good.