A hybrid inductor‐current sensor with fast response and high accuracy using online calibration for high‐frequency BUCK DC‐DC converters

IF 1.8 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC International Journal of Circuit Theory and Applications Pub Date : 2024-08-12 DOI:10.1002/cta.4216

Wentai Yuan, Weitao Xie, Zhijian Chen, Xiaoling Lin, Xian Tang, Yanqi Zheng

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Abstract

This paper introduces a hybrid inductor‐current sensor with fast response and high accuracy using online calibration for 25 MHz BUCK DC‐DC converter. The proposed inductor‐current sensor combines the high accuracy of the senseFET sensing method with the lossless and real‐time response characteristics of the RC filter technique. Comparing to exist techniques, the proposed calibration scheme can make filter coefficient converge even in unsteady state, which improve its effectiveness in practical application. Moreover, the proposed inductor‐current sensor utilizes sample‐based senseFET‐based current sensing to offer calibration reference, which avoid the use of high bandwidth amplifier. Digital current balance control is seamlessly integrated into the 25 MHz 2‐phase digital adaptive time‐controlled (AOT) BUCK DC‐DC converter through the utilization of the proposed hybrid inductor‐current sensor. The 2‐phase BUCK DC‐DC converter is implemented in a standard 0.18‐µm CMOS process. After online calibration, proposed hybrid inductor‐current sensor outputs a full‐wave waveform with high accuracy and low propagation delay of only 9 ns in post‐layout simulation.

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利用在线校准实现快速响应和高精度的混合电感电流传感器，适用于高频 BUCK DC-DC 转换器

本文针对 25 MHz BUCK DC-DC 转换器，介绍了一种利用在线校准实现快速响应和高精度的混合电感电流传感器。所提出的电感电流传感器结合了 senseFET 传感方法的高精度和 RC 滤波器技术的无损实时响应特性。与现有技术相比，所提出的校准方案即使在不稳定状态下也能使滤波器系数收敛，从而提高了其在实际应用中的有效性。此外，所提出的电感电流传感器利用基于采样感应场效应管的电流感应来提供校准参考，从而避免了使用高带宽放大器。通过利用所提出的混合电感器-电流传感器，数字电流平衡控制被无缝集成到 25 MHz 2 相数字自适应时间控制（AOT）BUCK DC-DC 转换器中。两相 BUCK DC-DC 转换器采用标准 0.18µm CMOS 工艺实现。经过在线校准后，所提出的混合电感电流传感器可输出高精度的全波波形，并且在布局后仿真中传播延迟仅为 9 ns。

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来源期刊

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.

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