Single-switch boost converter with extremely high step-up voltage gain
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ORIGINAL ARTICLE
Single‑switch boost converter with extremely high step‑up voltage gain Yangyang Hao1 · Haibin Li1 · Kai Li1 · Chengqun Fang1 · Xinping Ding1 Received: 20 February 2020 / Revised: 4 September 2020 / Accepted: 7 September 2020 © The Korean Institute of Power Electronics 2020
Abstract This paper presents a single-switch high-voltage gain DC–DC converter with a coupled-inductor. The proposed converter overcomes the drawbacks of traditional DC–DC converters such as insufficient boost capability and high stress on the devices. Its advantages include having a small number of switch devices, low voltage stress on the switch, and a high voltage gain. This paper analyzes the operating modes of the proposed converter in detail and derives the voltage/current stresses on the components. The efficiency of the converter and the power dissipation distribution are quantitatively studied. To verify the efficiency and feasibility of the proposed converter, a 200 W prototype was built in the laboratory. Experimental results obtained from the prototype match well with the theoretical analysis. The highest efficiency is equal to 95.82%, which can be obtained at half of the rated output power. Keywords High step-up voltage gain · Low stress · Coupled inductor · Single-switch DC · DC converter
1 Introduction Population growth and advancements in science and technology in the twenty-first century have led to an increased urgency to solve the energy problem. In addition, the shortage of fossil fuels and high environmental pollution have made secondary energy sources more attractive. In recent years, thanks to continuous breakthroughs in renewable energy technologies, the secondary energy sources represented by photovoltaic power generation, fuel cells and wind power generation have been widely used in various fields. A lot of the current research in this field is focused on high voltage gain converters, with which the number of "microsources" in series can be decreased. The traditional boost converter has a simple structure and a high efficiency. However, the efficiency is limited by the presence of parasitic parameter losses in the boost converter and reverse recovery power losses in the rectifier diode under high voltage gain conditions. High voltage gain converters have been developed to deal with these problems, which usually utilize switched-inductor, voltage-lift, * Xinping Ding [email protected] 1
School of Information and Control Engineering, Qingdao University of Technology, Qingdao, China
switched-capacitor and cascading techniques to achieve voltage boosting [1–10]. In [2], a special structure was designed that enables two inductors to charge in parallel and discharge in series. The design ensured continuous input and output currents while increasing the output voltage. In [3–5], voltage-lift technology was used to increase output voltage. It transferred energy from the input voltage to a certain capacitor. Then, it transferred the energy of the capacitor to the output voltage. Switched-capacitor integr
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