Design Considerations for LLC Series-Resonant Converter in Two-Resonant Regions

Author

Hsieh, Guan-Chyn ; Tsai, Cheng-Yuan ; Hsieh, Shih-Hung

Author_Institution

Tung Nan Inst. of Technol., Taipei

fYear

2007

Firstpage

731

Lastpage

736

Abstract

A current waveform modeling for describing the dynamic behavior of a half-bridge LLC series-resonant converter (LLC-SRC) working in two resonant regions is proposed. The resonant inductor current i_L is modeled approximately as a linear combination of the magnetizing current i_m and the primary current i_p, where both two currents are orthogonal. The key parameter estimations, including K factor, resonant L_r. and C_r, quality factors Q_K and Q_r are clearly derived and described for design considerations. Two 240 W LLC-SRC converters are designed and examined for performance evaluation. Both two efficiencies are as high as 91%-95% in the two regions. Simulation and experiment is close to the estimation works.

Keywords

parameter estimation; resonant power convertors; LLC series-resonant converter; parameter estimations; resonant inductor current; Chromium; Inductance; Magnetic resonance; Magnetic switching; Q factor; Region 1; Resonant frequency; Switches; Switching converters; Zero voltage switching; K factor; LLC-SRC;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2007. PESC 2007. IEEE

Conference_Location

Orlando, FL

ISSN

0275-9306

Print_ISBN

978-1-4244-0654-8

Electronic_ISBN

0275-9306

Type

conf

DOI

10.1109/PESC.2007.4342078

Filename

4342078