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High-Frequency Modelling of Constant On-Time Current Mode Buck Converter and Controller Design by Combining Genetic Algorithm
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2022-08-10 , DOI: 10.1109/tpel.2022.3197768
Xiangpeng Cheng 1 , Jinjun Liu 1 , Yu Shao 1 , Zeng Liu 1
Affiliation  

Constant on-time current mode (COTCM) Buck converters are widely used in power management integrated circuit (ICs) for microprocessors. Small-signal models are necessary tools to design high-quality controllers. Existing models neglect output voltage ripples (OVRs) and spectrum extension caused by switching, which makes significant errors under high control bandwidth. This article adopts Fourier series to describe OVRs precisely. Then, influences of OVRs on COTCM are analyzed. Finally, spectrum coupling from current loop and voltage loop is incorporated to obtain a high-frequency model, and four universal analytical expressions in frequency domain are obtained with the aid of matrix calculation. Based on the proposed model and genetic algorithm, an optimal controller design method is developed. Simulation and experiment validate the accuracy of proposed model and the effectiveness of proposed design method.

中文翻译:

结合遗传算法的恒导通电流模式Buck变换器高频建模及控制器设计

恒定导通时间电流模式 (COTCM) 降压转换器广泛用于微处理器的电源管理集成电路 (IC)。小信号模型是设计高质量控制器的必要工具。现有模型忽略了由开关引起的输出电压纹波 (OVR) 和频谱扩展,这在高控制带宽下会产生很大的误差。本文采用傅里叶级数来精确描述 OVR。然后,分析了 OVR 对 COTCM 的影响。最后,结合电流环和电压环的频谱耦合得到高频模型,并借助矩阵计算得到四个频域通用解析表达式。基于所提出的模型和遗传算法,开发了一种最优控制器设计方法。
更新日期:2022-08-10
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