(19)

(11)

EP 2 556 586 A1

(12)

(43) Date of publication: 13.02.2013 Bulletin 2013/07 (21) Application number: 10713204.5 (22) Date of filing: 08.04.2010

(51) International Patent Classification (IPC):  H02M 7/797(2006.01) H02J 3/18(2006.01) H02M 7/49(2007.01) (86) International application number: PCT/EP2010/054666 (87) International publication number: WO 2011/124260 (13.10.2011 Gazette 2011/41)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (71) Applicant: Alstom Technology Ltd. 5400 Baden (CH)	(72) Inventors: DAVIDSON, Colin Charnock Stafford Staffordshire ST17 0JZ (GB) TRAINER, David Derby Derbyshire DE24 0AG (GB) (74) Representative: Ilgart, Jean-Christophe et al BREVALEX 95 rue d'Amsterdam 75378 Paris Cedex 8 75378 Paris Cedex 8 (FR)