非同調フィルタによる3f電源回路の力率および効率の改善

概要

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Using the LCr-type power filter, we carried out some improvements in the input power factor P.F and power efficiency ηs of the power frequency tripler. Solving the close expression of load current and filter current, we get the solution of Fourier coefficients and effective value of currents. Then the analyzing of P.F and ηs is possible. In this paper, for following three ways, we examined P.F and ηs with graph. The method (1) is tuning type parallel-branch LCr filter in general, (2) is tuning type series-parallel-branch LCr filter for avoiding the large current loss of filter when its tuned, and (3) is tuning-out type LCr filter that the simple way avoiding the large current loss. As for (1) and (2), we got the similar solutions. As for (3), we found that both P.F and ηs is improving. And the initial purpose was achieved.