摘要
采用平均大信号建模法,结合全桥LLC谐振倍压功率变换器,开展LLC谐振功率变换器的大信号建模研究。分析了SSOC(Self-sustained oscillation controller)调制方式,在该调制方式下LLC谐振功率变换器的工作模式;建立了LLC谐振功率变换器的非线性状态空间模型,分析了非线性项的近似线性化、谐波平衡等处理环节,推导出LLC谐振功率变换器的平均大信号模型;通过仿真表明,平均大信号模型与非线性状态空间模型的仿真曲线基本吻合,验证了平均大信号模型的准确性。该大信号模型适用于指导LLC谐振功率变换器的现代非线性控制回路的设计。
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.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2015年第5期921-926,共6页
Journal of System Simulation
