Table 4 Input signal frequency detection and correction results
Fundamental frequency (Hz) | Number of cycle zeros | Zero crossing detection frequency (Hz) | Autocorrelation detection frequency (Hz) | Frequency after calibration (Hz) | Error (%) |
|---|---|---|---|---|---|
50 | 2 | 50.20 | 50.20 | 50.00 | 0.00 |
50 | 6 | 149.85 | 49.68 | 50.00 | 0.00 |
50 | 10 | 248.00 | 49.60 | 50.00 | 0.00 |
450 | 2 | 448.65 | 449.03 | 449.00 | − 0.22 |
450 | 6 | 1359.45 | 452.90 | 453.00 | 0.67 |
450 | 10 | 2256.75 | 451.48 | 451.00 | 0.22 |
1150 | 2 | 1144.25 | 1144.03 | 1144.00 | − 0.52 |
1150 | 6 | 3451.00 | 1150.40 | 1150.00 | 0.00 |
1150 | 10 | 5790.25 | 1157.90 | 1158.00 | 0.70 |
2555 | 2 | 2552.44 | 2552.30 | 2552.00 | − 0.12 |
2555 | 6 | 7726.32 | 2575.30 | 2575.00 | 0.78 |
2555 | 10 | 12,723.90 | 2544.50 | 2545.00 | − 0.39 |