A Unified Sampled-Data Small-Signal Model for a Ripple-Based COT Buck Converter With Arbitrary Ripple Injection Network

IF 5.2 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems I: Regular Papers Pub Date : 2025-04-10 DOI:10.1109/TCSI.2025.3557278

Francesco Gabriele;Antonio Carlucci;Davide Lena;Fabio Pareschi;Riccardo Rovatti;Stefano Grivet-Talocia;Gianluca Setti

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引用次数: 0

Abstract

In this paper, we present a novel and unified small-signal modeling technique for Pulse-Width Modulated (PWM) DC-DC Buck converters with Ripple-Based Constant On-Time (RBCOT) control. In fact, despite the spread of RBCOT-based converters in several applications requiring tight dynamic performances and a low architectural complexity, their description through small-signal models is not always as reliable as that of fixed-frequency PWM control architectures, and a general and exact modeling framework is not well established. The proposed methodology is grounded on the DC-DC converter state-space representation and thus, differently from other modeling techniques, it permits to fully characterize the dynamic behavior of generic RBCOT converter topologies with arbitrary complex power stage and ripple injection networks. As a case study, we derive the small-signal model for a Buck converter embedding a widely used ripple injection network in industrial applications. The validity of the theoretical results is confirmed through direct comparison with SIMetrix/SIMPLIS simulations and experimental measurements in practical application scenarios, confirming the accuracy of the model even well beyond the converter switching frequency.

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具有任意纹波注入网络的基于纹波的COT Buck变换器的统一采样数据小信号模型

在本文中，我们提出了一种新颖的统一的小信号建模技术，用于基于纹波的恒定导通时间（RBCOT）控制的脉宽调制（PWM） DC-DC降压变换器。事实上，尽管基于rbcot的变换器在一些需要严格动态性能和低架构复杂性的应用中得到了广泛应用，但它们通过小信号模型的描述并不总是像固定频率PWM控制体系结构那样可靠，并且没有很好地建立通用和精确的建模框架。所提出的方法基于DC-DC转换器状态空间表示，因此，与其他建模技术不同，它允许完全表征具有任意复杂功率级和纹波注入网络的通用RBCOT转换器拓扑的动态行为。作为案例研究，我们推导了嵌入工业应用中广泛使用的纹波注入网络的Buck变换器的小信号模型。通过与simmetrix /SIMPLIS仿真和实际应用场景的实验测量结果的直接比较，验证了理论结果的有效性，证实了模型的准确性甚至远远超出了变换器的开关频率。

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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来源期刊

IEEE Transactions on Circuits and Systems I: Regular Papers 工程技术-工程：电子与电气

CiteScore

9.80

自引率

11.80%

发文量

441

审稿时长

2 months

期刊介绍： TCAS I publishes regular papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: - Circuits: Analog, Digital and Mixed Signal Circuits and Systems - Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic - Circuits and Systems, Power Electronics and Systems - Software for Analog-and-Logic Circuits and Systems - Control aspects of Circuits and Systems.