Operation Mode Analysis and Peak Gain Approximation of the LLC Resonant Converter

被引:320
作者
Fang, Xiang [1 ]
Hu, Haibing [1 ,2 ]
Shen, Z. John [1 ]
Batarseh, Issa [1 ]
机构
[1] Univ Cent Florida, Dept Elect Engn & Comp Sci, Orlando, FL 32826 USA
[2] Nanjing Univ Aeronaut & Astronaut, Nanjing 210016, Jiangsu, Peoples R China
关键词
DC-DC power conversion; generalized analysis; resonant converter; STEADY-STATE ANALYSIS; FREQUENCY;
D O I
10.1109/TPEL.2011.2168545
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
With the advantage of achieving zero voltage switching for a wide input voltage range, the LLC resonant topology has become increasingly popular for use in high power density and high-efficiency power converter applications. However, when the LLC converter is applied to wide input voltage range applications, the widely used fundamental harmonic approximation is incapable of guiding the design due to its inaccuracy. Thus an accurate LLC converter model is desired. In this paper, a generalized mode analysis is presented that provides highly accurate prediction on resonant current and voltage behavior and dc gain characteristic. Also, because operation modes are affected by load, frequency, and gain conditions, the boundaries and distribution of modes are discussed and illustrated. Based on the mode analysis, an approximation method is developed to estimate the peak gain point, which is useful in LLC design. This approximation demonstrates high accuracy within the simulation results. An experimental prototype is built to verify the analysis.
引用
收藏
页码:1985 / 1995
页数:11
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