An experimental analysis of the randomized PWM in the boost rectifier
Several recommendations and standards have increased the interest in power factor correction circuits. There are multiple solutions in which line current is sinusoidal and boost rectifier is one of them. In this paper an experimental analysis of the randomized pulse width modulation (RPWM) algorithm in the boost rectifier is performed, The influence of randomization is followed: first, introduction of the RPWM switching is reflected in smaller increase of the total harmonic distortion (THD) factor in the input current. Nevertheless, decrease of the power factor is negligibly small. Second, power spectrum density (PSD) of the input current is estimated and measured to evaluate the influence of the randomization in the high frequency range. Based on this approach, lower conductive electromagnetic interference (EMI) is expected and also experimentally verified.
boost rectifier power factor randomized pulse width modulation total harmonic distortion power spectrum density electromagnetic interference high power factor correction circuit