一种用对数反对数电路实现真有效值AC/DC转换的方案

Journal of Applied Sciences ›› 2000, Vol. 18 ›› Issue (1): 72-75.

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True RMS AC/DC Conversion Based on the Log and Anti-log Electronic Circuits

NIE Kai-bao, CHEN Di, CHEN Zhi-jian

Department of Electronic Engineering, Shandong University, Jinan 250100, China

Received:1998-10-11 Revised:1999-05-24 Online:2000-03-31 Published:2000-03-31

Abstract

Abstract: This paper discusses the high accuracy true RMS AC/DC conversion using log and anti log algorithm. On the basis of theoretical analysis, basic conversion formula is derived and then is used to analyze how to realize high accuracy AC/DC conversion. Finally, an actual conversion system with super-β and difference-matched transistors is implemented and tested. Results show that the new method is capable of realizing a high accuracy AC/DC conversion for measurement of true RMS value.

Key words: true RMS value, AC voltage, AC/DC conversion, digital multimeter

CLC Number:

NIE Kai-bao, CHEN Di, CHEN Zhi-jian. True RMS AC/DC Conversion Based on the Log and Anti-log Electronic Circuits[J]. Journal of Applied Sciences, 2000, 18(1): 72-75.

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True RMS AC/DC Conversion Based on the Log and Anti-log Electronic Circuits

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