A Single-Switch DC-DC High Step-Up Converter with Soft Switching for Photovoltaic Applications

Subject Areas : Electronic Engineering

Tayebeh Shamsi ¹ (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran )
Majid Delshad ² (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran )
Ehsan Adib ³ (Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran )
Mohammad Rouhollah Yazdani ⁴ (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran )

Received: 2023-04-09 Accepted : 2023-11-02 Published : 2024-12-20

Keywords: DC-DC converters, High step-up, Single-switch, Soft switching, Efficiency,

Abstract :

A single-switch DC-DC high step-up converter is presented in this paper. There are soft switching conditions in the proposed converter for switching on and off time, which increases efficiency. In order to increase the gain, two coupled inductors have been used, and the leakage inductance of the coupled inductors has been used to create a soft switching condition, and the minimal auxiliary element has been used in the proposed converter. In the proposed converter, only one switch is used, and the condition of the converter is no different from a basic converter in terms of the control circuit. Therefore, the converter does not need to design a new control circuit. The auxiliary circuit added to the converter with a minimal element, provides soft switching conditions for the switch at turn-on, under zero current and at turn-off, under zero voltage, which, in addition to increased efficiency, the circuit has a simple structure. Therefore, the innovation of the paper is to present a switching converter high step-up soft without imposing an additional switch and with a low number of elements. The proposed converter is simulated after full theoretical analysis at 400 W output power, which shows the efficiency of 97.2 percent, in addition to proving the theoretical analysis. Also, the prototype of the converter is made and the experimental results obtained prove the theoretical and simulation results.

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