Title :
A methodology for true comparison of analytical and measured frequency domain spectra in random PWM converters
Author :
Bech, Michael M. ; Pedersen, John K. ; Blaabjerg, Frede ; Trzynadlowski, Andrzej M.
Author_Institution :
Inst. of Energy Technol., Aalborg Univ., Denmark
fDate :
5/1/1999 12:00:00 AM
Abstract :
The analysis of random pulsewidth modulation (PWM) techniques has matured into a state where analytical expressions have been derived to aid in understanding the frequency domain characteristics. Derivations of the formulae require a lot of algebra, and the expressions must be verified by laboratory measurements. It is shown, however, that factors originating from digital signal processing techniques make the comparison difficult if proper measures against misinterpretation are not taken. A methodology to overcome the problems is presented. Novel expressions for the random lead-lag pulse position technique and the random switching frequency technique are also presented as well as their verifications by laboratory measurements on a full-bridge DC/DC power converter
Keywords :
DC-DC power convertors; PWM power convertors; bridge circuits; frequency-domain analysis; spectral analysis; switching circuits; digital signal processing techniques; frequency domain characteristics; frequency domain spectra; full-bridge DC/DC power converter; random PWM converters; random lead-lag pulse position technique; random switching frequency technique; Algebra; Digital signal processing; Frequency domain analysis; Frequency measurement; Laboratories; Power measurement; Pulse measurements; Pulse width modulation; Space vector pulse width modulation; Switching frequency;
Journal_Title :
Power Electronics, IEEE Transactions on
