High Accuracy Frequency Detection Method Using 1 to mthHarmonics

This paper proposes the high Accuracy frequency detection method by using 1 to m
^th
harmonics. In the proposed method, frequencies of harmonics are detected, and the sum of them is divided by the sum of these orders. The proposed method improves the frequency detection accuracy by (m+1)/(2√{m}) as compared with the conventional method using only the m
^th
harmonic. The improvement of the frequency detection accuracy is derived from formulation and is confirmed by simulation and measurement results.