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According to the voltage gain of boost converter at the photovoltaic inverter system, a high gain switched inductor boost converter is proposed in this paper by analyzing and studying the voltage gain ability of traditional switched inductor boost converter which improves the switched inductor three-terminal network topology. The working principle and working characteristics of the designed boost topology are analyses in detail, and the corresponding mathematical model is established. Compared with the traditional converter, the proposed converter has some advantages which improving the boost ability and decreasing the voltage stress of the switch tube. Moreover, the simulations are shown to verify the correctness of the theoretical analysis. INTRODUCTION Recently, the renewable energy resources are increasingly used to produce energy. Solar energy can be considered as the best renewable energy because of the earth surface receives an amount of solar energy which is more than the world energy demand. As a result, solar cells and solar power generation becomes the popular topics which addressed by many researches and projects 1,2 , and the high-gain DC-DC converter as a key composition in photovoltaic system has been extensively used and researched 3,4 . The traditional switched inductor boost converter 5 has the characteristics of small inductor in size, mutual symmetry and the large gain enhancement space compared to the boost converter. However, the input gain is limited, and the power switch voltage stress is equal to the output voltage which has high power switch conduction loss. Furthermore, the voltage stress produced by the output diode is equal to the output voltage which results more serious problem of the reverse recovery. In order to improve the above disadvantages of switched inductor boost converter, the literature 6 proposed to add the coupling inductor and clamp circuit to improve the voltage gain, but the leakage inductance affect the conversion efficiency, increase the voltage stress of power switch, and electro magnetic interference(EMI) problem are more serious. This paper improved the switching inductor three-terminal network, and proposed a switched inductor boost converter based on the topology combination which has high voltage gain and small power stress of the power switched tube. Finally, the paper analyses the working principle of the proposed boost converter, and verifies the correctness of the theoretical analysis by circuit simulation. Zhuo JING 1 , Song GAO 1, *, Chao-bo CHEN 1 and Shen-hao GAO 1 1 School of Electronic Information Engineering, Xi’an Technological University, 710021, Xi’an, China Corresponding author: gaos@xatu.edu.cn

Research of Switched Inductor Boost Converter Based on Topology Combination