| Abstract |
Random pulse width modulation (RPWM) techniques for voltage-source inverters have gained a strong foothold in modem power electronics. Of the several randomization schemes proposed, dithering the widths of consecutive switching intervals seems most promising in all aspects. In this paper, for a discrete distribution of non-rational interval widths, powers in the de and fundamental components of the switching function are determined. It is
shown that ideally there is no power in any other frequency components, and that the optimal solution consists simply in two equiprobable widths. An expression for the noise power spectral density that results from the randomization is provided, and numerical and experimental examples are presented. |
