用于精确电流传感的MOSFET导通电阻在线校准

IEEE Power Electronics Letters Pub Date : 2004-09-01 DOI:10.1109/LPEL.2004.839635

Yang Zhang;R. Zane;A. Prodic;R. Erickson;D. Maksimovic

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引用次数: 51

摘要

提出了一种在线电流感测校准方法，其中辅助开关和精确感测电阻器与主电源开关并联，以实现与感测电阻器方法相当的精度，以及基本上没有额外功率损耗的优点。所提出的电流感测电路和校准方法特别适合于可以容易地实现所需控制和校准功能的数字控制器实现。数字控制的1.5-V 15-a同步降压转换器的实验结果证明了在线校准方法的功能，表明功率MOSFET导通电阻上的电压传感精度显著提高。

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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Online calibration of MOSFET on-state resistance for precise current sensing

An approach for online current sensing calibration is presented where an auxiliary switch and a precision sense resistor are connected in parallel with a main power switch to achieve accuracy comparable to the sense resistor method, together with the advantage of essentially no additional power loss. The proposed current-sensing circuit and the calibration methods are particularly well suited for digital controller implementations where the required control and calibration functions can be easily accomplished. Experimental results with a digitally controlled 1.5-V 15-A synchronous buck converter demonstrate functionality of the online calibration approach, showing a significant improvement in accuracy over voltage sensing across the power MOSFET on-resistance.

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