Characterization and comparison of noise generation for quasi-resonant and pulse-width-modulated converters
AuthorHsiu, Leng-nien, 1964-
AdvisorWitulski, Arthur F.
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PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractA buck converter with a given output filter is operated with pulse-width modulated and quasi-resonant switching schemes at the same nominal load and switching frequency. Electromagnetic interference generated by the natural switching action of the converter is examined by Fourier spectral analysis. Interference caused by excitation of parasitic elements is examined experimentally. Quasi-resonant converters are found to have a lower switching frequency harmonic bandwidth than the equivalent pulse-width modulated converter. The most significant parasitic responses are the turn-on current and turn-off voltage of the catch diode, and the gate charge current of the MOSFET switch. A significant decrease in radiated and conducted noise is obtained when the gate drive voltage rise and fall times are increased, which is possible without loss of efficiency using quasi-resonant switching.