峰值电流控制高阶变换器非线性现象研究

Study of Nonlinear Phenomena of Peak Current Controlled Higher-Order Converter

峰值电流控制CF-superbuck变换器是高阶变换器,具有复杂的非线性动力学行为。该文建立了峰值电流控制CF-superbuck变换器的离散迭代映射模型,通过数值仿真得到了CF-superbuck变换器的分岔图,研究了系统非线性动力学的演化过程。最后,通过电路仿真和实验得到了电感电流和电容电压所对应的时域波形图和相图,验证了该高阶变换器中的非线性现象。

Peak current controlled current-fed superbuck （CF-superbuck） converter is a higher-order converter, which has complex nonlinear dynamical behavior. The discrete iterative map model of peak current controlled CF-superbuck converter is established in this paper. Then, the bifurcation diagram of CF-superbuck converter is obtained by numerical simulation, which presents the evolution of nonlinear dynamics of the system. Finally, the time-domain waveforms of the inductor current and the capacitor voltage, and the corresponding phase diagrams are obtained from the circuit simulation and experiment. The result verify the nonlinear phenomena in this higher-order converter.