Parameter Model and Design for LLC Resonant Half-bridge Converter
Wang Zhendao1, Zhao Yakui1, Zhang Jing2, Wu Xu1, Yi Feng3
1. School of Physics and Microelectronics Sciences, Hunan University Changsha 410082 China 2. College of Electrical and Information Engineering, Hunan University Changsha 410082 China 3. China Electronics Technology Group Corporation NO.58 Research Institute Wuxi 214000 China
Abstract：According to working principle of LLC topology, a mathematical model for LLC resonant half- bridge converter is presented in this paper. On the basis of conversion relations between the best conversion efficiency and wide scope of load changes, leakage inductance, magnetic inductance and resonant capacitance are confirmed according to the proposed model. Also a LLC resonant half-bridge converter is designed. By improving switch frequency to MHz-level, its converter efficiency can reach to 94% either in full or light loader. At the same time, the power density can reach to 500W/in3. Experiment results ultimately verify the correctness of the model and parameter deduction.
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2012, Vol. 27 
