摘要:
提出一种新的开关变换器控制方法,多级脉冲序列(multilevel pulse train,MPT)控制方法.MPT控制器可根据开关变换器的工作状态,将多个强弱等级不同的控制脉冲组成脉冲序列对变换器进行控制.MPT控制方法易于实现,控制系统具有良好的瞬态特性和鲁棒性,可以应用于各种拓扑结构的开关变换器.介绍了MPT控制方法的原理和实现方式,详细阐述了MPT控制Buck变换器的工作特性、控制规律和小信号模型,并进行了分析对比、仿真和实验研究.研究结果表明,MPT控制变换器比传统PWM控制变换器瞬态性能更好,比脉冲序列控制变换器输出电压纹波更小.
Abstract:
A new control technique, multilevel pulse train (MPT), for switching converters is proposed in this paper. By using MPT control, according to different operation states, multilevel pulses are combined to generate a multilevel pulse train for the control of switching converters. MPT control technique is easy to realize, with great robust ness and good transient performance. The principle and implementation of the control technique are introduced, and the operation, characteristics and small-signal model of MPT controlled buck converter are also studied. The analysis, simulation and experimental results show that MPT control technique has much faster transient response than traditional PWM control technique and much lower output voltage ripple than the pulse train control technique.
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