Suppression of high-frequency perturbations in pulse-width modulation

摘要

The present invention relates to a method for suppressing high-frequency perturbations in a pulse-width modulation, pulse-width modulating a first electronic signal by superposing a first carrier signal having a camer frequency (f c ) and an input signal with a first modulation frequency (f m.1 ) to obtain a first pulse-width modulated signal; pulse-width modulating n second electronic signals, where n ‰¥ 1 is an integer, by superposing n second carrier signals having the carrier frequency (f c ) with an input signal with a second modulation frequency (f m.2 ) wherein the n second carrier signals are, respectively, phase shifted with respect to the first carrier signal to obtain n second pulse-width modulated signals; filtering (3) the first pulse-width modulated signal to obtain a first perturbed filtered signal and filtering (3') the n second pulse-width modulated signals to obtain n second perturbed filtered signals; and combining (4) the first perturbed filtered signal and the n second perturbed filtered signals to obtain an enhanced output wanted signal.