HARMONICS MEASUREMENT METHOD USING A DSP BASED ASIC |
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| K. Fujino, K. Fukuo |
- Abstract:
- A compact, low cost harmonics measurement equipment, harmonics monitorTM, has been developed using a DSP based mixed signal ASIC. Each effective current harmonics from the basic frequency up to the 19th order harmonics and the total harmonics distortion ratio can be obtained in real time. In stead of using a conventional FFT method a 6th order, digital IIR filtering method was used for the accurate measurement. It allowed the computation to be in real time and the configuration of the main circuitry to be simplified into a single chip, thereby reducing the system cost. To compensate gain drop of ADC outputs over a continuous wide range of frequency the second order equalizing digital IIR filter was applied as well. The measurement accuracy has been realized within ± 0.5% of full scale from the basic frequency up to 19th order harmonics frequency.
- Keywords:
- harmonics, total harmonics distortion ratio, 6th order IIR filter
- Download:
- IMEKO-WC-2000-TC4-P126.pdf
- DOI:
- -
- Event details
- Event name:
- XVI IMEKO World Congress
- Title:
Measurement - Supports Science - Improves Technology - Protects Environment ... and Provides Employment - Now and in the Future
- Place:
- Vienna, AUSTRIA
- Time:
- 25 September 2000 - 28 September 2000