A Low Cost Microcontroller Based True RMS Measurement Using Fast AC to DC Converter

摘要：

Root mean square is the fundamental measurement of magnitude of AC signal. With increasing awareness about the power quality issues, true RIMS measurement of basic parameters of electrical power system has became very essential. A new technique for true rms measurement of electrical parameters is developed. In proposed approach, the bipolar input signal is converted to unipolar one using fast and high bandwidth ac to dc converter. The unipolar ac signal is synchronously sampled using successive approximation type ADC. Input signal is sampled synchronously over a period of time for accurate measurement. The incremental delay type sampling avoids the sampling of same point over and over. The sampled data is digitally processed and the true RMS information is extracted. Various algorithms are developed in assembly language to keep the code compact and efficient. It is proved that, with same ADC precision, higher effective precision can be obtained if the input signal is unipolar. The suggested measurement system is developed and tested in the laboratory. Laboratory test results are given which compares the performance of the prototype and standard meter under sinusoidal and non sinusoidal condition. The meter has accuracy up to 0.1％.

关键词： Fast AC to DC Converter Microcontroller Oversampling Sampling Rate Synchronous sampling True RMS

作者: Uday B.Mujumdar Jayant S.Joshi

作者单位: Electrical Department Shri Ramdeobaba kamla Nehru Engineering College Nagpur- India Electrical Department Shri Ramdeobaba kamla Nehru Engineering College Nagpur-India

会议类型: 国际会议

会议名称: 2010 International Conference on Measurement and Control Engineering(2010年IEEE测量与控制工程国际会议 ICMCE2010)

会议地点: 成都

会议语种:英文

页码: 30-34

在线出版日期: 2010-11-16（万方平台首次上网日期，不代表论文的发表时间）