Large Signal Modeling for LLC Resonant Converter

Abstract

Abstract: The large-signal model modeling issue of LLC resonant converter was dealt with by using averaged large-signal modeling method, on the basis of a full-bridge LLC voltage-multiplying resonant converter. The SSOC (self-sustained oscillation controller) was analyzed, and the operation mode of LLC resonant converter under the SSOC mode was investigated. The nonlinear state space model of LLC resonant converter was established by analyzing linear approximation of nonlinear terms and harmonic balance, and the averaged large-signal model of LLC resonant converter was proposed. Two curves of large signal model and nonlinear state space model were proved to be identical by simulation, indicating that the proposed large-signal model is accurate. This averaged large-signal model can be used to guide the design of the nonlinear control loop.

Key words: LLC resonant converter, large-signal model, nonlinear system, SSOC

CLC Number:

TP391.9

Zheng Kai, Li Jianbing, Zhou Dongfang, Li Kai, Zhang Songzhen. Large Signal Modeling for LLC Resonant Converter[J]. Journal of System Simulation, 2015, 27(5): 921-926.

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