Reference design for one-phase power meter

The electro-mechanical power meter has been gradually replaced by the electronic meter. Modern electronic meters have a number of advantages over their electro-mechanical predecessors. Their mechanical construction is more cost-effective due to the fact that there are no moving parts. In addition, electronic meters have a one per cent accuracy, or even better, in the dynamic range of power measurement of 1000:1, whereas electro-mechanical meters have a two per cent accuracy in the dynamic range of 80:1. The higher the accuracy and dynamic range of the measurement, the more precise the energy bills.

This design reference manual describes a solution for a one-phase electronic power meter based on the MKM34Z128CLL5 microcontroller. This microcontroller is part of the Freescale Kinetis-M microcontroller family. The Kinetis-M microcontrollers address accuracy needs by providing a high-performance analogue front-end (24bit AFE) combined with an embedded Programmable Gain Amplifier (PGA). Besides high-performance analogue peripherals, these new devices integrate memories, input-output ports, digital blocks, and a variety of communication options. Moreover, the ARM Cortex-M0+ core, with support for 32bit math, enables fast execution of metering algorithms.

View the PDF document for more information.

Originally published by Freescale Semiconductor at www.freescale.com as "Kinetis-M One-Phase Power Meter Reference Design".