A comparative investigation on the use of random modulation schemesfor DC/DC converters
Tse, K.K.; Chung, H.S.-H.; Hui, S.Y.R.; So, H.C.
Industrial Electronics, IEEE Transactions on
Volume 47, Issue 2, Apr 2000 Page(s):253 - 263
Digital Object Identifier   10.1109/41.836340
Summary:A comparative investigation on the use of random modulation schemes for DC/DC power converters is presented. The modulation schemes under consideration include randomized pulse position modulation, randomized pulsewidth modulation (PWM) and randomized carrier-frequency modulation with fixed and variable duty cycle. The paper emphasizes the suitability and applicability of each scheme in DC/DC power converters. Issues addressed include the effectiveness of randomness level on spreading the dominating frequencies that normally exist in constant-frequency PWM schemes, and the low-frequency power spectral density (PSD) of each scheme. The validity of the analyses is confirmed experimentally by using a DC/DC buck converter operating in the continuous conduction mode. The PSD of the output under each scheme is presented and compared

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