Effects of symmetric distribution laws on spectral power density in randomized PWM

The effects on the spectral power density (SPD) of randomized pulse width modulation (RPWM) waveforms by the choice of different probability distribution laws are investigated. The distribution laws under studied are symmetric uniform, normal, laplace, and parabolic. A comparison method, based on a...

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Bibliographic Details
Published in:IEEE power electronics letters 2003-06, Vol.1 (2), p.41-44
Main Authors: Drissi, K.E.K., Luk, P.C.K., Bin Wang, Fontaine, J.
Format: Article
Language:English
Subjects:
Analytical models
Delay
Density
Derivation
Deviation
Electromagnetic compatibility
Engineering Sciences
Law
Laws
Power generation
Probability distribution
Pulse duration modulation
Pulse width modulation
Randomization
Space vector pulse width modulation
Spectra
Spread spectrum communication
Switches
Switching frequency
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Summary:The effects on the spectral power density (SPD) of randomized pulse width modulation (RPWM) waveforms by the choice of different probability distribution laws are investigated. The distribution laws under studied are symmetric uniform, normal, laplace, and parabolic. A comparison method, based on a normalized deviation with respect to the uniform distribution law, is devised. It is shown, by way of analytical derivation and simulations, that uniform distribution produces power spectrum comparable to those generated by other relatively more complex distributions under studied. Significantly, it means that uniform distribution, which is the simplest to implement, is the preferred probability law for randomization in a RPWM scheme.
ISSN:1540-7985
1558-3767
DOI:10.1109/LPEL.2003.820825