Phase accumulated carrier pulse width modulation

Walker, G.R., Broadmeadow, M.A.H., & Ledwich, G.F. (2015) Phase accumulated carrier pulse width modulation. In 2015 IEEE 11th International Conference on Power Electronics and Drive Systems, IEEE, Sydney, N.S.W, pp. 948-957.

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Abstract

An alternative approach to digital PWM generation uses an accumulator rather than a counter to generate the carrier. This offers several advantages. The resolution and gain of the pulse width modulator remain constant regardless of the module clock frequency and PWM output frequency. The PWM resolution also becomes fixed at the register width. Even at high PWM frequencies, the resolution remains high when averaged over a number of PWM cycles. An inherent dithering of the PWM waveform introduced over successive cycles blurs the switching spectra without distorting the modulating waveform. The technique also lends itself to easily generating several phase shifted PWM waveforms suitable for multilevel converter modulation. Several example waveforms generated using both simulation and FPGA hardware are presented.

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ID Code: 92801
Item Type: Conference Paper
Refereed: Yes
DOI: 10.1109/PEDS.2015.7203434
ISBN: 9781479944026
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 IEEE
Deposited On: 11 Feb 2016 01:18
Last Modified: 11 Feb 2016 21:46

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