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Energies 2017, 10(3), 378; doi:10.3390/en10030378

A Novel High Step-Up DC-DC Converter with Coupled Inductor and Switched Clamp Capacitor Techniques for Photovoltaic Systems

1
Department of Electrical Engineering, National Cheng Kung University, No. 1 University Road, Tainan 701, Taiwan
2
Power Supply Group, National Synchrotron Radiation Research Center, 101, Hsin-Ann Road, Hsinchu 300, Taiwan
3
Mission Critical Infrastructure Solutions Business Unit, Delta Electronics INC, 39 Section 2, Huan-dong Road, Shanhua Township, Tainan 741, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Jih-Sheng (Jason) Lai and Frede Blaabjerg
Received: 9 September 2016 / Revised: 7 March 2017 / Accepted: 10 March 2017 / Published: 16 March 2017
View Full-Text   |   Download PDF [7789 KB, uploaded 17 March 2017]   |  

Abstract

In this study, a novel high step-up DC-DC converter was successfully integrated using coupled inductor and switched capacitor techniques. High step-up DC-DC gain was achieved using a coupled inductor when capacitors charged and discharged energy, respectively. In addition, energy was recovered from the leakage inductance of the coupled inductor by using a passive clamp circuit. Therefore, the voltage stress of the main power switch was almost reduced to 1/7 Vo (output voltage). Moreover, the coupled inductor alleviated the reverse-recovery problem of the diode. The proposed circuit efficiency can be further improved and high voltage gain can be achieved. The operation principle and steady-state analysis of the proposed converter were discussed. Finally, a hardware prototype circuit with input voltage of 24 V, output voltage of up to 400 V, and maximum power of 150 W was constructed in a laboratory; the maximum efficiency was almost 96.2%. View Full-Text
Keywords: high voltage gain; switch-clamp capacitor; power generation; energy conversion high voltage gain; switch-clamp capacitor; power generation; energy conversion
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Wong, Y.-S.; Chen, J.-F.; Liu, K.-B.; Hsieh, Y.-P. A Novel High Step-Up DC-DC Converter with Coupled Inductor and Switched Clamp Capacitor Techniques for Photovoltaic Systems. Energies 2017, 10, 378.

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