In this paper, a conventional constant-switching-frequency discontinuous mode converter is analyzed by applying the double Fourier series expansion. It is found that the fundamental component and higher-order harmonics included in the input current waveform are obtained by the Fourier series expansion of the mean value of the inductor current. As the result of analysis, components included in the input current waveform are fundamental plus third harmonics and other components can be neglected.
From the theoretical analysis, a new method removing the distortion of the input current waveform is also proposed. In spite of an open loop system, the proposed method makes a great improvement of the total harmonic distortion even if the ratio of output voltage to input voltage is very low.
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