9 Conclusion

This implemented emulation model for phase sequence detection of the three-phase AC supply using ZCD, ADC, and timer peripherals of the AVR128DA48 microcontroller. The application note also describes phase reversal, phase loss faults detection, and RMS voltage measurement on the three-phase AC supply using the AVR128DA48 Curiosity Nano development board, Curiosity Nano adapter board, and waveform click boards.

The usage of ZCD enables faster, more precise, and reliable detection of the phase sequence compared to the traditional approach using ADC only, because the ADC related computation time is eliminated. Also, availability of the ZCD peripheral within the microcontroller makes the application more cost-effective and efficient by reducing both board space and BOM (Bill of Materials) cost. The ZCD peripheral together with a rich set of analog and advanced digital peripherals of AVR DA microcontrollers are well-suited for the applications monitoring the phase reversal and single phasing faults of AC power supplies.