State-Trajectory Control With Single-Cycle Response for Point-of-Load Converters
State-Trajectory Control With Single-Cycle Response for Point-of-Load Converters
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DOI：
10.1109/tie.2019.2913820
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发表时间：
2020-04
影响因子：
7.7
通讯作者：
Virginia Li;Qiang Li;F. Lee;Pei-hsin Liu
中科院分区：
文献类型：
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作者：
Virginia Li;Qiang Li;F. Lee;Pei-hsin Liu
用于负载点（POL）转换器应用的一种流行的变频控制是恒定导通（COT）控制。采用高带宽设计的COT控制能够提高轻载效率，减少输出电容的数量，但COT控制的瞬态响应受到控制的固定准时性的限制。本文提出了一种基于状态轨迹的POL变换器单周期瞬态响应控制方法。利用所提出的控制，在检测到负载升压暂态期间，变流器将遵循变流器的自然状态轨迹，这可以确保非常快的暂态响应。实验结果不仅证明了所提出的想法，而且还证明了该控制器进一步减少输出电容器数量和节省电路板占地面积的能力。
A popular variable-frequency control used for point-of-load (POL) converter application is the constant on-time (COT) control. COT control is able to improve light-load efficiency and reduce the amount of output capacitors with high-bandwidth designs, but the transient response of COT control is limited by the fixed on-time nature of the control. In this paper, a state-trajectory-based control with single-cycle transient response is proposed for POL converters. With the proposed control, the converter will follow the natural state trajectory of the converter for the duration of the detected load step-up transient, which can ensure a very fast transient response. Experimental results are presented to not only demonstrate the proposed idea but also the control's ability to further reduce the amount of output capacitors and save board footprint.