F. BORDRY, A. DUPAQUIER, "High Current, Low Voltage Power Converters for LHC. Present Development Directions"

F. BORDRY, A. DUPAQUIER, "High Current, Low Voltage Power Converters for LHC. Present Development Directions" Copyright - [Précédente] [Première page] [Suivante] - Home

Article : [PAP284]

Titre : F. BORDRY, A. DUPAQUIER, High Current, Low Voltage Power Converters for LHC. Present Development Directions

Auteur : Frédérick Bordry
Auteur : André Dupaquier, SL Division, CERN, Geneva, Switzerland

Lien : private/MOP009G.pdf - 3 pages, 34 Ko.

Abstract :
The superconducting LHC accelerator requires high
currents (12.5kA) and relatively low voltage (~10V) for
its magnets. The need to install the power converters
underground is the driving force for reduced volume and
high efficiency of the power converters. Moreover, the
machine will require a very high level of performance
from the power converters, particularly in terms of DC
stability and dynamic response. To meet these
requirements switch-mode techniques will be used. This
paper gives a survey of current switch-mode converter
topologies for high DC current output. The presentation
is primarily focused on the various methods for low-loss
switching in DC power converters operating with high
switching frequency (20 - 50 kHz). A modular concept is
being studied, using several current sources in parallel,
to adapt to the various circuits and also provide
redundancy.

CONCLUSION

The results of the work described in this paper prove
that soft-switching techniques are necessary and suitable
for the LHC power converters. All the future efforts in
development will be to select and improve the best
topology with its control strategy for all the types of
converters, especially for the bipolar converters.

Acknowledgements

The authors wish to thank the many CERN, academic
and industrial colleagues who participated in the
development projects described in this paper.

Bibliographie

REFERENCES : 8
[1] : "LHC Conceptual Design", CERN/AC/95-05 (LHC)
[2] : P. Proudlock, "Electrical powering Strategy of LHC. First Design Study", EPAC’96, Barcelona, June 96
[3] : G. Hua, F. Lee, "Soft-Switching PWM Techniques and their Applications", 5th European Conference EPE, Brighton, September 1993
[4] : T. Meynard, Y. Cheron, H. Foch, "Soft switching in DC/DC converters : Reduction of switching losses and of EMI generation", High Frequency Power Conversion Conference, San Diego, May 1988
[5] : G. Torvetjonn, T. Undeland, A. Pettererteig, "Analysis and Measurements on a PWM DC-DC converter with lossless snubbers", 1993 IEEE Industry Applications Society Annual Meeting, Toronto, Canada, Oct 1993
[6] : Y. Cheron, "Soft commutation", Chapman & Hall, 1992
[7] : D. Sadarnac and Al.,"Comparison between two new soft switching techniques adapted to high frequency converters", 6th EPE conference, Sevilla, Sept 95
[8] : B. Hennevin, S. Volut, A. Dupaquier, "Study and realisation of a 37.5 kW double resonance converter", EPE conference, Grenoble, 1987

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