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We have question regarding implementation of 3-phase power metering based on FFT metering libraries. We are deciding whether to use qt timer based U-I phase shift compensation or software based. 1. Looking at AN5007 section 6.2 there is a FFT sample proce

Question asked by david malovrh on Jan 17, 2017
Latest reply on Jan 18, 2017 by EARL GOODRICH

Question regarding implementation of 3-phase power metering based on FFT metering libraries, deciding whether to use qt timer based U-I phase shift compensation or software based.

  1. Looking at AN5007 section 6.2 there is a FFT sample process

    - how to trigger SD conversion (312us interval)?

    - is there additional delay needed between SD triggering for each phase as in Figure 5.?

  1. In case we use software based U-I phase shift compensation

    - how to fill phase-shift correction buffer for METERLIBFFT3PH_InitMainBuffPhX?

    - is it ok to calculate phase shift correction based on power factor during calibration
      process and use same value for each harmonic in buffer?

Martin Mienkina

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