The analysis and design of the power spectral density for DC/DC converters using randomized switching frequency pulse width modulation
Date
2000
Authors
Wang, Jian
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Abstract
In this thesis we study the analysis and design of the noise power spectral density for a randomized switching frequency pulse width modulation (RSFPWM) DC/DC converter based on the constant duty cycle scheme. We analyze the spectrum formulas of the controllable constant duty cycle scheme in order to control the power spectral density at a specified frequency. In some cases a null at the specified frequency is created. The effects of constraints on the switching frequencies are presented.
Further analysis considering the control of the power spectral density over a band of frequency is addressed under the assumption that the switching intervals are equally spaced and with symmetric probability distribution. Practical constraints on the switching frequencies are considered using optimization methods. Simulation results verify the theory and illustrate the effectiveness of our analysis and conclusions.