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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。
The PWM type step-down DC-DC converter working in the continuous mode of inductor current is taken as the research object, and its working behavior and output characteristics under different circuit parameters are studied. Through a series of periodic bifurcations and a series of periodic orbits on the VI phase space graph, the variation regularity of the DC-DC converter from the steady state to the chaotic state is revealed, which proves that the change of the circuit component parameters Resulting in DC-DC converter chaos behavior. In this paper, the output voltage characteristics of DC-DC converter from steady state to chaos state are analyzed respectively in time domain and frequency domain. According to the change of output harmonic voltage of inverter from period-1 to chaos state in frequency domain The trend, the conclusion reached will help to optimize the design of DC-DC converter in the future.