This paper proposes a simple and effective method for improving the power factor of a capacitor-filtered single phase rectifier circuit. The fundamental idea is to use an ac nonlinear reactor and to insert it to the input side of that. This reactor has two values of inductance. For the current less than a previously specified value, the inductance is low, whereas it is high when the current is larger than that. Such a reactor can prevent the current from excessively rising when it is in an increasing state. This leads to a great suppression of the higher harmonic currents and to an improvement of the power factor. The effectiveness of the proposed method is confirmed through the experimental test and the computer simulation.
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