Spectral analysis and EMI comparison of PWM, quasi-resonant, and resonant converters

In this paper, a theoretical method for analyzing the spectra of modulated control signals for PWM, Quasi-Resonant Converters (QRC), and Resonant Converters (RC) is presented. A comparison of the EMI performance of the QRC, RC, and PWM converters is given based on the spectral bandwidth. Our study shows that, for the same line and load variation, the QRC and RC have better EMI performance than the PWM converter.

[1]  Daniel Mitchell,et al.  Pulsewidth modulator phase shift , 1980, IEEE Transactions on Aerospace and Electronic Systems.

[2]  Arthur F. Witulski,et al.  Characterization and comparison of noise generation for quasi-resonant and pulse-width modulated converters , 1991 .

[3]  Rui Liu,et al.  Comparison of EMI performance of PWM and resonant power converters , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.