An Efficient High-Step-Up Soft-Switching Boost Converter for Photovoltaic Application

Mehdi Akhbari | Pooya Amiri | Mohammad Nilsaz

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=85095
Date :  2018/05/05
Publish in :    Journal of Electric Power and Energy Conversion Systems

Link :  http://jepecs.shahed.ac.ir/article_762.html
Keywords :Converter, Photovoltaic

Abstract :

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In this paper, an efficient high step-up boost converter with a coupled-inductor with soft-switching operation is presented. The proposed topology includes a coupled-inductor boost converter for raising the voltage gain. Moreover, a simple auxiliary resonant circuit composed of an auxiliary switch, a clamping diode and a resonant tank (inductor, capacitor), is adopted in this paper. The coupled-inductor boost converter presents poor efficiency because of hard switching and switch losses. All switches in the adopted circuit perform zero-current switching at turn-on, and zero-voltage switching at turn-off. This soft-switching operation reduces the switching losses and diode reverse-recovery problems. The converter uses PWM method for switching and it is controlled by a PI controller to improve its dynamic response. The paper presents detailed analysis of the converter operational modes. A 225W dc-dc converter is designed and evaluated by simulations. The results are presented to confirm the theoretical analysis.