On dynamic effects influencing IGBT losses in soft switching converters
2011 (English)In: IEEE Transactions on Power Electronics, ISSN 0885-8993, Vol. 26, no 1, 260-271 p.Article in journal (Refereed) Published
Two different dynamic effects influencing the IGBT losses in soft switching converters are demonstrated. The first one, The Dynamic tail-charge effect shows that the tail-charge is dependent not only on the absolute value of the current at turn-off but also on the dynamics of the current. This effect may have a significant impact on the optimization of zero-current-switching converters. The Dynamic conduction losses originate from the conductivity modulation lag of the IGBT. It is shown by experiments that the on-state losses depend on the operating frequency. Different methods to accurately determine the on-state losses are evaluated. It was found that the best method is an indirect measurement where the stray inductance is identified by the use of an oscillating circuit. The experiments are performed under a sinusoidal current excitation at a fixed amplitude (150 A) for different frequencies (up to 104 kHz). The switching devices used are IGBT-modules rated 300-400 A/1200 V in a bridge-leg configuration. From the experiments performed it is found that IGBTs of a modern PT design have the lowest losses in the series-loaded resonant converters studied in the present paper.
Place, publisher, year, edition, pages
IEEE , 2011. Vol. 26, no 1, 260-271 p.
IGBT, conductivity modulation, resonant converters, soft switching, tail-current
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-25216DOI: 10.1109/TPEL.2010.2055581ISI: 000285843000025ScopusID: 2-s2.0-78650984362OAI: oai:DiVA.org:kth-25216DiVA: diva2:356571
QC 201010132010-10-132010-10-132012-01-04Bibliographically approved