Adaptive‐biased sense‐FET–based inductor‐current sensor for 10‐MHz buck converter,International Journal of Circuit Theory and Applications

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Adaptive‐biased sense‐FET–based inductor‐current sensor for 10‐MHz buck converter
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-02-19 , DOI: 10.1002/cta.2768
Yong Zhou ₁ , Xiaohui Lin ₂ , Jianxin Yang ₂ , Yanqi Zheng ₂ , Ka Nang Leung ₁

Affiliation

A sense field effect transistor (FET)–based inductor‐current sensor for buck converters is introduced in this paper. The proposed current sensor adopts and realizes piecewise‐linear adaptive bias to maintain consistent bandwidth and phase margin in the sensor's control loop throughout a wide range of load currents. Moreover, the specially designed turn‐on/off process of switches is introduced together with the sole gain–boosted amplifier to avoid the sharp transitions in the sensed peak and valley currents during the deadtime zone of synchronous buck converters. Simulation results of the proposed sensor show an 11.6‐dB rise in direct current (DC) gain at light load (approximately 200 mA) and 21° improvement in phase margin at heavy load (approximately 2 A), compared with the traditional structure with fixed‐bias current. Furthermore, the variation in the unity gain bandwidth of the proposed structure across the whole load range is 12.8 times lower than that of the traditional designs.

中文翻译：

适用于10 MHz降压转换器的基于自适应FET的电感电流传感器

本文介绍了一种用于降压转换器的基于感应场效应晶体管（FET）的电感电流传感器。提出的电流传感器采用并实现了分段线性自适应偏置，以在宽范围的负载电流范围内保持传感器控制环路中一致的带宽和相位裕量。此外，还引入了专门设计的开关导通/关断过程以及唯一的增益增强型放大器，以避免在同步降压转换器的死区期间感测到的峰值电流和谷值电流急剧变化。与固定结构的传统结构相比，拟议传感器的仿真结果表明，在轻载（约200 mA）下直流（DC）增益提高了11.6 dB，在重载（约2 A）下相位裕度提高了21°。偏置电流。此外，

更新日期：2020-02-19

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