Title :
A comparative investigation on the use of random modulation schemes for DC/DC converters
Author :
Tse, K.K. ; Chung, Henry Shu-Hung ; Hui, S.Y.R. ; So, H.C.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Hong, Kowloon, Hong Kong
fDate :
4/1/2000 12:00:00 AM
Abstract :
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
Keywords :
DC-DC power convertors; modulation; random processes; switching; switching circuits; DC/DC power converters; buck converter; continuous conduction mode; dominating frequencies; duty cycle; low-frequency power spectral density; random modulation schemes; randomized carrier-frequency modulation; randomized pulse position modulation; randomized pulsewidth modulation; Buck converters; DC-DC power converters; Power electronics; Power harmonic filters; Power system harmonics; Pulse modulation; Pulse width modulation; Pulsed power supplies; Space vector pulse width modulation; Switching frequency;
Journal_Title :
Industrial Electronics, IEEE Transactions on
