High-Frequency LLC Resonant Converter with GaN Devices and Integrated Magnetics

Yu-Chen Liu, Chen Chen, Kai- De Chen, Yong-Long Syu and Meng-Chi Tsai
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Yu-Chen Liu: Department of Electrical Engineering, National Ilan University, No. 1 Section 1 Shennong Road, Yilan 260, Taiwan
Chen Chen: Department of Electronic Engineering, National Taiwan University of Science, and Technology, No. 43 Section 4 Keelung Rd Da’an District, Taipei 10607, Taiwan
Kai- De Chen: Department of Electronic Engineering, National Taiwan University of Science, and Technology, No. 43 Section 4 Keelung Rd Da’an District, Taipei 10607, Taiwan
Yong-Long Syu: Department of Electronic Engineering, National Taiwan University of Science, and Technology, No. 43 Section 4 Keelung Rd Da’an District, Taipei 10607, Taiwan
Meng-Chi Tsai: Department of Electrical Engineering, National Ilan University, No. 1 Section 1 Shennong Road, Yilan 260, Taiwan

Energies, 2019, vol. 12, issue 9, 1-19

Abstract: In this study, a light emitting diode (LED) driver containing an integrated transformer with adjustable leakage inductance in a high-frequency isolated LLC resonant converter was proposed as an LED lighting power converter. The primary- and secondary-side topological structures were analyzed from the perspectives of component loss and component stress, and a full-bridge structure was selected for both the primary- and secondary-side circuit architecture of the LLC resonant converter. Additionally, to achieve high power density and high efficiency, adjustable leakage inductance was achieved through an additional reluctance length, and the added resonant inductor was replaced with the transformer leakage inductance without increasing the amount of loss caused by the proximity effect. To optimize the transformer, the number of primary- and secondary-side windings that resulted in the lowest core loss and copper loss was selected, and the feasibility of the new core design was verified using ANSYS Maxwell software. Finally, this paper proposes an integrated transformer without any additional resonant inductor in the LLC resonant converter. Transformer loss is optimized by adjusting parameters of the core structure and the winding arrangement. An LLC resonant converter with a 400 V input voltage, 300 V output voltage, 1 kW output power, and 500 kHz switching frequency was created, and a maximum efficiency of 97.03% was achieved. The component with the highest temperature was the transformer winding, which reached 78.6 °C at full load.

Keywords: LLC resonant converter; integrated transformer; adjustable leakage inductance; LED driver (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: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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