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

Volume

14

Issue

3

fYear

1999

fDate

5/1/1999 12:00:00 AM

Firstpage

578

Lastpage

586

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;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.761702

Filename

761702