Wide-band frequency analysis of the randomized boost rectifier

This paper deals with wide-band frequency analysis of the boost rectifier with pulse width modulation (PWM) control as well with randomized PWM control. In the low frequency range, introduction of the RPWM is reflected in smaller increasing of the input current´s total harmonic distortion (THD) factor and consequently in neglected reduction of power factor. Because of randomization of the switching processes the power spectral density (PSD) of the input current is estimated and measured for detecting the influence of the randomization in the medium frequency range. High frequency switching of the boost converter generates the electromagnetic interference (EMI) in the radio frequency (RF) range and therefore conducted EMI measurements have been performed. At the end of analysis, it can be concluded that estimations of the power spectrum offer an effective and good prediction method for conducted EMI together with low-cost measuring equipment.