说明：  Abstract: Randomized modulation is of increasing interest in power electronics and also holds promise for reducing filtering requirements in ac/ac, dc/dc converter application and reducing acoustic noise in motor drive applications. This paper deals with the power spectrum density (PSD) estimation methods of the random controlled pulse width modulation (RPWM) single-phase structured boost rectifier. Estimated PSD is also experimentally verified. The switch-mode operation of the converter results in Electromagnetic Interference (EMI) which is produced due to large di/dt and dv/dt. In addition to all steps to minimize the generation of EM1 (i.e. introduction of RPWM), improvement of power spectra will also be considered.