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On dynamic effects influencing IGBT losses in soft switching converters
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).ORCID iD: 0000-0002-1755-1365
2011 (English)In: IEEE Transactions on Power Electronics, ISSN 0885-8993, Vol. 26, no 1, 260-271 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
IGBT, conductivity modulation, resonant converters, soft switching, tail-current
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25216DOI: 10.1109/TPEL.2010.2055581ISI: 000285843000025Scopus ID: 2-s2.0-78650984362OAI: oai:DiVA.org:kth-25216DiVA: diva2:356571
Note
QC 20101013Available from: 2010-10-13 Created: 2010-10-13 Last updated: 2012-01-04Bibliographically approved
In thesis
1. Control and Design Aspects of Components and Systems in High-Voltage Converters for Industrial Applications
Open this publication in new window or tab >>Control and Design Aspects of Components and Systems in High-Voltage Converters for Industrial Applications
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High-frequency dc-dc converters are widely used in power electronic applications, both in consumer products and industrial products. By operating the converter at higher frequencies both a smaller size and better control characteristics can be obtained.

It is the objective of this work to investigate how high-frequency power converters can be optimized for high-voltage industrial applications. Specifically, power supplies for electrostatic precipitators (ESP) are considered. The work refers to operating frequencies higher than 20 kHz and load voltages reaching 100 kV and above. The power handling capability ranges from 10 to 200 kW.

High-frequency power supplies were originally introduced on the ESP market in 1993. An evaluation of the experiences gained during the first decade of operation is presented. It was found that the dust emissions have been reduced at the majority of the installations.

Efficiency aspects like IGBT losses in soft-switching operation with a sinusoidal collector current and the influence of different control methods have been analyzed. Dynamic properties of the IGBT such as: dynamic conduction losses and dynamic tail charges are presented and experimentally verified. The IGBT losses have been evaluated for LCC-converters operating above the resonance frequency. The losses have been measured and compared for different control methods and for different turn-off strategies, zero-current-switching and zero-voltage-switching, respectively. It is shown experimentally that the LCC-converter is more efficient than the series-loaded resonant converter for a range of values of the parallel capacitance. This is because the LCC-converter allows a lower turns ratio of the transformer.

The high-voltage high-frequency transformer has been analysed with respect to its parasitic elements. A method is presented, integrated rectification, which enables a sub-division of the winding capacitance into an AC-part and a DC-part. It is validated experimentally that they may be utilized as circuit elements and that the ratio of these capacitances may be varied within a wide range. This method is considered to be of importance when optimizing converters utilizing topologies where the output rectifier is followed by a capacitive filter.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. xii, 85 p.
Series
Trita-EE, ISSN 1653-5146 ; 2010:038
Keyword
High-voltage converter, resonant converter, high-voltage transformer, transformer parasitics, IGBT, soft-switching, control
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-25280 (URN)978-91-7415-757-4 (ISBN)
Public defence
2010-10-29, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20101014Available from: 2010-10-14 Created: 2010-10-14 Last updated: 2010-10-14Bibliographically approved

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Nee, Hans-Peter

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