Interleaved High Step-Up DC–DC Converter with Voltage-Lift and Voltage-Stack Techniques for Photovoltaic Systems

Shin-Ju Chen, Sung-Pei Yang, Chao-Ming Huang and Yu-Hua Chen
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Shin-Ju Chen: Department of Electrical Engineering, Kun Shan University, Tainan 710303, Taiwan
Sung-Pei Yang: Department of Electrical Engineering, Kun Shan University, Tainan 710303, Taiwan
Chao-Ming Huang: Department of Electrical Engineering, Kun Shan University, Tainan 710303, Taiwan
Yu-Hua Chen: Department of Electrical Engineering, Kun Shan University, Tainan 710303, Taiwan

Energies, 2020, vol. 13, issue 10, 1-20

Abstract: A novel interleaved high step-up DC–DC converter applied for applications in photovoltaic systems is proposed in this paper. The proposed configuration is composed of three-winding coupled inductors, voltage multiplier cells and a clamp circuit. The step-up voltage gain is effectively increased, owing to the voltage-stack and voltage-lift techniques using the voltage multiplier cells. The leakage inductor energy is recycled by the clamp circuit to avoid the voltage surge on a power switch. The low-voltage-rated power switches with low on-state resistances and costs can be used to decrease the conduction losses and increase the conversion efficiency when the voltage stresses of power switches for the converter are considerably lower than the high output voltage. The reverse-recovery problems of diodes are mitigated by the leakage inductances of the coupled inductors. Moreover, both the input current ripple and the current stress on each power switch are reduced, owing to the interleaved operation. The operating principle and steady-state analysis of the proposed converter are thoroughly presented herein. A controller network is designed to diminish the effect of the variations of input voltage and output load on the output voltage. Finally, the experimental results for a 1 kW prototype with 28–380 V voltage conversion are shown to demonstrate its effectiveness and performance.

Keywords: interleaved operation; three-winding coupled inductor; high step-up DC–DC converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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