G. Dolan, D. Grafham, J. Saiz, "8kW RESONANT CONVERTER FOR X-RAY MACHINES USES HIGH SPEED POWER MODULES WITH INTEGRAL LIQUID COOLING", ADVANCED POWER TECHNOLOGY, APT9904.
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Article : [PAP276]

Titre : G. Dolan, D. Grafham, J. Saiz, 8kW RESONANT CONVERTER FOR X-RAY MACHINES USES HIGH SPEED POWER MODULES WITH INTEGRAL LIQUID COOLING, ADVANCED POWER TECHNOLOGY, APT9904.

Cité dans :[PAP265]
Auteur : Geoff Dolan - R&D Engineer, CREOS Inc., Englewood CO, USA
Auteur : Denis Grafham - European Applications, Advanced Power Technology, B-1330 Rixensart
Auteur : José Saiz - R&D Engineer, Advanced Power Technology Europe, F-33700 Mérignac

Info : ADVANCED POWER TECHNOLOGY
Lien : APT9904.pdf - 9 pages, 99 Ko.
Pages : 1 9

Abstract :
This paper describes an innovative method for the removal of heat from the
four IGBT power modules equipping a 48kW ZVS-mode resonant power
converter for CT X-ray machines. In this converter, output voltage is regulated
between 80 and 140kV with 1% accuracy and low ripple, by varying the switching
frequency from 48-68kHz. Even though switching losses are well below 1%, at
these power levels large air-cooled heat sinks are needed to evacuate the heat. In
installations where space is at a premium, water-cooling is a viable alternative.
Traditionally, liquid cooling is implemented by bolting a power module onto a water-cooled
heat exchanger. While more effective than air cooling, the arrangement is less than ideal, thanks to the
thermal barrier between the module and its separate sink. This interface contributes significantly to the total
junction-to-water thermal resistance. In APT’s Integral Liquid Cooled (ILC) heat-exchanger concept there is
no interface, because the module’s baseplate doubles as the heat exchanger’s lid. In this way, the cooling fluid
is in direct contact with the module, and thermal resistance is dramatically reduced.

Bibliographie

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References : 7
(1) : The use of duality rules in the conception of transistorized converters. H.Foch, P.Marty, J.Roux, PCI Proceedings, Munich 1980, pp4B3 1-11
(2) : Power transfer control methods in high frequency resonant converters. Y.Cheron, H.Foch, J.Roux, PCI Proceedings, Munich, 1986, pp 92-103
(3) : La commutation douce. Y.Cheron, Lavoisier TEC et DOC, France, 1989.
(4) : Switching limits in static converters using soft commutation. M.Metz, J.P.Arches, H.Foch, S.Boyer, D.Ferrer and S.Ben Doua, Power electronics and variable speed drives, IEE, London, July 1990.
(5) : Les composants à grille isolée en mode "thyristor-dual". H.Foch, M.Metz, JP.Arches, Ch.Saubion, Revue générale d’électricité, février 1994, N°2, p. 13-22.
(7) : MOS-gated power semiconductors configured in the ZVT thyristor-dual mode yield >95% converter efficiency at 1-10 kW, when resonantly switched at 20-400 kHz. Serge Bontemps, Alain Calmels, PT Europe, Bordeaux. France, Phillipe Cussac, CIRTEM Labège, France, Henri Foch, Université de Toulouse France, Denis Grafham, APT, Rixensart Belgique.
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  [3] : [LIVRE039] Y. CHERON, La commutation douce dans la conversion de l'énergie électrique, TECH DOC - LAVOISIER, 1989.
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  [7] :  [PAP265]  S. BONTEMPS, A. CALMELS, P. CUSSAC, H. FOCH, D. GRAFHAM, MOS-Gated power semiconductors configured in the ZVT thyristor-dual mode yield > 95% converter efficiency at 1-10 kw, when resonantly switched at 20-400 kHz, ADVANCED POWER TECHNOLOGY, APT9601.

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