摘要
A DC DC buck converter c on trolled by naturally sampled, constant frequency PWM is considered. The existe nce of chaotic solutions and the output performance of the system under differen t circuit parameters are studied. The transforming pattern of system behavior fr om steady state to chaotic is discovered by the cascades of period doubling bi furcation and the cascades of periodic orbit in V I phase space. Accordingl y, it is validated that change of values of the circuit parameters may lead DC DC converter to chaotic motion. Performances of the output ripples fro m steady state to chaotic are analyzed in time and frequency domains respective ly. Some important conclusions are helpful for opt imization design of DC DC converter.
以工作在电感电流连续模式下的 PWM型降压式DC-DC变换器为研究对象 ,对其在不同电路参数下的工作行为及其输出特性进行了研究。通过分叉图上的一系列倍周期分叉及 V-I相空间图上的一系列周期轨道 ,揭示了 DC-DC变换器由稳态到混沌态的变化规律 ,从而证明了电路元件参数的变化可导致 DC-DC变换器出现混沌行为。本文在时域和频域上分别对 DC-DC变换器从稳态到混沌态的输出电压特性进行了分析 ,根据变换器的输出谐波电压从周期 -1至混沌态在频域上的变化趋势 ,得出的结论有助于今后 DC-DC变换器的优化设计。
基金
国家自然科学基金 ( G5 96770 2 1 )资助项目~~
