A state machine decoder for phase disposition pulsewidth modulation of three-phase coupled-inductor semi-bridge converters

Teixeira, C, McGrath, B and Holmes, G 2016, 'A state machine decoder for phase disposition pulsewidth modulation of three-phase coupled-inductor semi-bridge converters', IEEE Transactions on Industry Applications, vol. 52, no. 3, pp. 2378-2386.


Document type: Journal Article
Collection: Journal Articles

Title A state machine decoder for phase disposition pulsewidth modulation of three-phase coupled-inductor semi-bridge converters
Author(s) Teixeira, C
McGrath, B
Holmes, G
Year 2016
Journal name IEEE Transactions on Industry Applications
Volume number 52
Issue number 3
Start page 2378
End page 2386
Total pages 9
Publisher IEEE
Abstract Coupled-inductor semi-bridge converters, assembled from magnetically linked pairs of complementary unidirectional phase legs, can achieve a substantially improved harmonic output voltage performance with the same number of silicon devices as traditional converters. However, they must be operated so as to ensure that a continuous common-mode current always flows through each coupled inductor, to ensure each phase leg can always produce the required switched output voltage. This is particularly challenging for a three-phase coupled-inductor bridge controlled by phase disposition (PD) modulation, since there is no direct correlation between the modulator output and the individual phase leg switching device commands. This paper presents a novel strategy to control each phase leg's common-mode inductor current under PD modulation, by introducing a square wave offset signal into the modulator reference command, and feeding the modulator output through a postprocessing state machine to correctly switch each semi-bridge phase leg to maintain the required dc common-mode current. The strategy has been verified by detailed simulation studies and matching experimental results.
Subject Industrial Electronics
Keyword(s) Inverters
modulation
multilevel systems
power electronics
pulsewidth modulated power converters
DOI - identifier 10.1109/TIA.2015.2512524
Copyright notice © 2015 IEEE
ISSN 0093-9994
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