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Amalgamated-signal Cymometer Based on TMS320F28335
College of Electrical Engineering, Zhejiang University, Hangzhou ,China
College of Electrical Engineering, Zhejiang University, Hangzhou ,China
College of Electrical Engineering, Zhejiang University, Hangzhou ,China
- 1 College of Electrical Engineering, Zhejiang University, Hangzhou ,China
- 2 College of Electrical Engineering, Zhejiang University, Hangzhou ,China
- 3 College of Electrical Engineering, Zhejiang University, Hangzhou ,China
Energy and Power Engineering·Volume 05 (2013)·Pages 1226–1229·Published 30 June 2013·DOI10.4236/epe.2013.54B232
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Abstract
In our design, an amalgamated-signal cymometer is developed with a TMS 320F 28335 DSP chip ---- we use its on-chip 12-bit 16-channel AD to conduct a novel dual-sequencer synchronize sampling and averaged to improve the accuracy. Considering the algorithm, we use TI's C28x_FPU_Lib to conduct a FFT with sampled results and correct spectrum with Time-Shift Phase Difference Correcting Spectrum Method based on all-phase spectral analysis. Namely, we design a sampling-frequency self-adaption algorithm which makes operation keep on without outside-hardware command. Actually, the test result shows that our design's frequency resolution ratio is up to 0.4%, and the maximum frequency’s D-value between main and minor signal is up to 29.99 kHz.
KeywordsDigital Frequency MeterSame Precision MeasurementDSPAll-phase Spectral AnalysisSampling-frequency Self-adaption
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