High precision load current sensing using on-line calibration of trace resistance

被引：13

作者：

Eirea, Gabriel ^{[1
]}

Sanders, Seth R. ^{[2
]}

机构：

[1] Univ Republica, Inst Ingn Elect, Montevideo, Uruguay

[2] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2008年 / 23卷 / 02期

关键词：

adaptive voltage positioning (AVP); current sensing; dc-dc converters; voltage regulator for modern microprocessors (VRMs);

D O I：

10.1109/TPEL.2007.915186

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A method for the on-line calibration of a circuit board trace resistance at the output of a buck converter is described. The input current is measured with a precision resistor and processed to obtain a dc reference for the output current. The voltage drop across a trace resistance at the output is amplified with a gain that is adaptively adjusted to match the dc reference. This method is applied to obtain an accurate and high-bandwidth measurement of the load current in the modern microprocessor voltage regulator application (VRM), thus enabling an accurate dc load-line regulation as well as a fast transient response. Experimental results show an accuracy well within the tolerance band of this application, and exceeding all other popular methods.

引用

页码：907 / 914

页数：8

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