NDLI: Basic auxiliary resonant pole (ARP) applied to three-level nested cells switching leg

Content Provider	IEEE Xplore Digital Library
Author	Dijkhuizen, F.R. Duarte, J.L.
Copyright Year	2004
Description	Author affiliation: ABB Corp. Res., Vasteras, Sweden (Dijkhuizen, F.R.)
Abstract	A variant of the auxiliary resonant pole (ARP) concept is described, aiming at assisting the generation of PWM waveforms with soft transitions by multilevel nested-cells switching legs. The technique presented, requires modest passive components and only two additional switches to perform soft commutations, being especially suited for three-level switching legs. The merit of the presented concept is that the boost current, high RMS pole current, additional losses in the main switches, dc link center potential stability problems and the need for additional commutation transformers are avoided. That because the resonant current is interrupted during each soft-commutation cycle by an auxiliary hard turn-off to avoid freewheeling. Therefore the auxiliary pulse commutation can be substantially accelerated thereby reducing the RMS pole current and the volt-seconds loss of the main switching leg. The demerit of the approach is that additional turn-off losses in the pole need to be weighted against the overall losses of the switching leg. The results are that the overall loss reduction is not substantially (16%) but that the thermal profile of the converter can be much more improved, particularly when the main IGBTs are operating with high continuous load currents near maximum device temperature. To emphasize the simplicity of the approach, the paper treats a step by step commutation example and the trade-off between hard- and soft switching. The ideas are experimentally verified with of-the-shelf dual-packed 1200 V IGBTs and illustrated by means of temperature measurements.
Sponsorship	IEEE Power Electon. Soc
Starting Page	4434
Ending Page	4440
File Size	503870
Page Count	7
File Format	PDF
ISBN	0780383990
ISSN	02759306
DOI	10.1109/PESC.2004.1354784
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-20
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resonance Leg Pulse width modulation Switches Insulated gate bipolar transistors Stability Pulse transformers Acceleration Thermal loading Temperature
Content Type	Text
Resource Type	Article

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