Energy Meter Design Operates Accurately Over Wide Current Range

Focus:

The current specification is an important parameter for energy meters as it signifies a meter's ability to accurately measure the power consumed by a user's electrical load. Both utilities and energy meter manufacturers would like to develop a single current specification that would meet the electricity demands of all users. This is a challenge that R&D teams have been working for years to solve. To that end, IDT has developed a metering IC that enables the design of a single-phase energy meter with a current specification of 1 A (100 A). This design maintains a measurement accuracy of better than 0.2% from 20 mA to 100 A. This energy meter design can merge existing requirements for multiple current specifications and therefore multiple meter designs. In this article, the authors describe the design of a 1 A (100 A) wide-span energy meter including the key points of hardware design, calibration procedures and metering features, and test data verifying meter performance.

What you’ll learn:

• How to build an electronic energy meter (watt-hour meter) with high accuracy over wide dynamic range

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Author & Publication:

Felix Yao, Kelly Ding, and Paul Pu, Integrated Device Technology, San Jose, Calif., How2Power Today, May 27 2011

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