Analysis and Design of a Digital Average Current-mode Controlled Buck Converter

Ravada Madhu Sudhan Rao, Mohsin Asad, A. Singha
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引用次数: 3

Abstract

Digital average current-mode control (CMC) technique is popular in the power management industry due to its better noise immunity and the ability to track average current with high accuracy. A discrete-time framework for modeling and analysis of the inner current-loop of a digital average current-mode controlled buck converter is presented in this paper. A discrete-time 1-D model of the current loop is exploited for both fast-scale stability analysis and controller tuning of the inner current loop. The analysis shows that stable range of the proportional gain of the current loop PI controller is limited by the applied input voltage of the buck converter. An analytical expression of the stable range of proportional gain is derived from the proposed analysis. A buck converter prototype is developed and digital controllers are implemented in a 32-bit microcontroller (TMS320F28335 from Texas Instruments). Experimental results show a good agreement with the proposed analysis. The framework of this paper can be exploited to analyze the stability status of average CMC in other types of DC-DC converters.
数字平均电流模式控制降压变换器的分析与设计
数字平均电流模式控制(CMC)技术由于具有较好的抗噪性和高精度跟踪平均电流的能力,在电源管理行业中得到了广泛的应用。本文提出了一种用于数字平均电流模式控制降压变换器电流内环建模和分析的离散时间框架。电流环的离散时间一维模型被用于快速尺度稳定性分析和内电流环的控制器调谐。分析表明,电流环PI控制器的比例增益稳定范围受降压变换器输入电压的限制。根据所提出的分析,导出了比例增益稳定范围的解析表达式。开发了降压转换器原型,并在32位微控制器(德州仪器公司的TMS320F28335)上实现了数字控制器。实验结果与分析结果吻合较好。本文的框架可用于分析其他类型的DC-DC变换器中平均CMC的稳定性状况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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