A New Soft Switching High Step-Up Converter Ability to Increase Parallel Branches without the Need for a New Auxiliary Circuit

Subject Areas : Renewable energy

Iman Es-haghpour ¹ , Majid Delshad ² , Saeid Javadi ³

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

Received: 2021-11-29 Accepted : 2022-04-10 Published : 2023-11-22

Keywords: Zero-current switching, High Step-up Converter, cross-coupled inductors, zero-voltage switching, low-voltage stress,

Abstract :

In this paper, an interleaved high step-up converter with a simple auxiliary circuit is presented. The proposed auxiliary circuit has the coupled inductor with the input inductors of the converter and provides zero voltage switching conditions for the main switches of the converter. On the other hand, auxiliary switches and diodes of auxiliary circuit operate under zero current condition and therefore do not impose significant losses on the converter. The auxiliary circuit is modular and can apply to more phases of the converter. Therefore, the converter can be easily designed for very high power applications. The proposed converter uses the cross-coupled inductors technique with series lift capacitors to increase the voltage gain and reduce the voltage stress on the main switches. Also, leakage inductance energy can be easily absorbed by the clamp capacitors and helps to increasing the voltage gain. The proposed high step-up converter has been analyzed in detail and a practical prototype has been implemented at 100W. The experimental results confirm the correctness of the operation of the circuit and the theoretical analysis.

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