A Soft Switched Non-Isolated High Step-Up DC-DC Converter with Low Number of Auxiliary Elements

Subject Areas : Renewable energy

Shabani Shabani ¹ , Majid Delshad ² , Ramtin Sadeghi ³

1 - Department of Electrical Engineering- Khorasgan Branch, Islamic Azad University, Khorasgan, Isfahan, Iran
2 - Department of Electrical Engineering- Khorasgan Branch, Islamic Azad University, Khorasgan, Isfahan, Iran
3 - Department of Electrical Engineering- Khorasgan Branch, Islamic Azad University, Khorasgan, Isfahan, Iran

Received: 2021-06-14 Accepted : 2021-10-07 Published : 2021-09-23

Keywords: Pulse Width Modulation, soft switching, high step-up, zero voltage transition,

Abstract :

In this paper, a new soft switched non-isolated high step-up DC-DC converter is proposed. An auxiliary circuit with minimum number of elements is added to the converter to provide the soft switching conditions for all the semiconductors solving the reverse recovery problem of the diodes, and reducing the conduction and the switching losses of the power switches. Moreover, there is only one magnetic core used in the converter decreasing the copper resistance; thus, the power losses and the electromagnetic interference of the converter is reduced so the efficiency of the proposed converter compared to the conventional hard switched boost converter, is improved. Further, in order to adjust the output voltage of the proposed converter to the desired value under the load variations, a PI controller has been applied to the output of the proposed converter and its operation is simulated by MATLAB. In order to verify the theoretical analysis of the soft switching operations, a 250W prototype is implemented and its experimental results are provided.

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