TIDUEM8B March   2019  – February 2021

 

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Description

This reference design implements Class 0.1 split-phase energy measurement using high-performance, multi-channel analog-to-digital converters (ADC). The ADC samples current transformers (CT) at 8 kHz to measure the current and voltage of each leg of the AC mains. The reference design achieves high accuracy across a wide input current range (0.05–100 A) and supports high sampling frequencies necessary for power quality features such as individual harmonic analysis. An ADC sample rate of 32 ksps can be acheived by disabling some software functions. Independent ADCs provide flexibility in the choice of metrology microcontrollers compared to integrated SoCs. This reference design uses a SimpleLink™ARM®Cortex®-M4 host microcontroller for metrology. The necessary software functionality is implemented in the ADC Energy Metrology library. The software library can be compiled with Code Composer Studio™ or IAR Embedded Workbench®.