Analysis and design of Boost-LLC converter for high power density AC-DC adapter

This paper proposes the size reduction methods for two-stage Boost-LLC converter to achieve high power density in 60W AC-DC adapter. The two-stage converter has high component count, and the passive components such as inductor, transformer, and capacitor occupy the most of the area. In order to make the converter have small size, this paper proposes the size reduction methods of passive components: the design of low link voltage, the design of the resonant tank without additional inductor and with high resonant frequency, and the design of C-L-C filter replacing output capacitor. A 60W (16.8V/3.65A) prototype adapter is designed and implemented to verify the feasibility of the proposed methods. The converter achieves 14.5W/in3 power density with the methods.

[1]  Yan Liang,et al.  Optimal design methodology for LLC resonant converter , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[2]  Gun-Woo Moon,et al.  Design of a power-factor-correction converter based on half-bridge topology , 1999, IEEE Trans. Ind. Electron..

[3]  Milan M. Jovanovic,et al.  Performance evaluation of 70-W two-stage adapters for notebook computers , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[4]  K. Schetters,et al.  Design of a 1-MHz LLC Resonant Converter Based on a DSP-Driven SOI Half-Bridge Power MOS Module , 2007, IEEE Transactions on Power Electronics.

[5]  Yan Liang,et al.  Design of integrated passive component for a 1 MHz 1 kW half-bridge LLC resonant converter , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[6]  Jong-Woo Kim,et al.  Design on topologies for high efficiency two-stage AC-DC converter , 2012, Proceedings of The 7th International Power Electronics and Motion Control Conference.

[7]  Hang-Seok Choi,et al.  Design Consideration of Half-Bridge LLC Resonant Converter , 2007 .

[8]  E. Janssen,et al.  Design of a 1-MHz LLC Resonant Converter Based on a DSP-Driven SOI Half-Bridge Power MOS Module , 2007 .

[9]  F.C. Lee,et al.  1MHz High Efficiency LLC Resonant Converters with Synchronous Rectifier , 2007, 2007 IEEE Power Electronics Specialists Conference.

[10]  J. Pleite,et al.  Size and cost reduction of the energy-storage capacitors , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..