基于松散耦合变压器的全桥谐振变换器非线性行为分析

Nonlinear Behaviors Analysis of Full-bridge Resonant Converter Based on Loosely Coupled Transformer

松散耦合感应电能传输系统利用电磁感应技术,实现了能量的非接触传输,解决了传统导线直接供电的缺陷,是一种有效、安全的电能传输方法。文中以全桥谐振变换器为例,基于松散耦合变压器分析了系统随着耦合系数的改变而发生的非线性分岔现象。通过互感模型建立系统的状态方程及其非线性模型,分析了系统谐振时的非线性行为,得到以耦合系数为分岔参数的系统复杂三维分岔图。电路仿真验证了系统的复杂分岔行为,并且进一步分析了系统在分岔过程中经历的边界碰撞现象以及准周期状态下系统的时域与频域特征。该研究将开关变换器的非线性研究拓展到无线电能传输系统中,对无线电能传输系统的可靠设计具有重要指导意义。

The loosely coupled inductive power transfer system is an effective and safe method of power transmission,which uses electromagnetic induction technology to achieve non-contact transmission of energy while solving the shortcoming of traditional power supply with wires.The nonlinear bifurcation phenomenon of the full-bridge resonant converter is analyzed with the change of the coupling coefficient of the loosely coupled transformer.The state equations and nonlinear models of the system are built based on the mutual inductance modeling.The nonlinear behaviors are numerically analyzed when the system resonates,and the complex three-dimensional bifurcation diagram is obtained with the coupling coefficient as the bifurcation parameter.The complex bifurcation behaviors of the system are validated by circuit simulation.Moreover,the border collision phenomenon and the characteristics of the time and frequency domains are analyzed.This study expands nonlinear research on the switching converter to the wireless power transfer system,providing important guidance for reliability design of the wireless power transfer system.