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(11)

EP 3 446 400 A1

(12)

(43) Date of publication: 27.02.2019 Bulletin 2019/09 (21) Application number: 16717651.0 (22) Date of filing: 22.04.2016

(51) International Patent Classification (IPC):  H02M 7/483(2007.01) H02M 1/32(2007.01) H02J 3/36(2006.01) (86) International application number: PCT/EP2016/058958 (87) International publication number: WO 2017/182091 (26.10.2017 Gazette 2017/43)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD (71) Applicant: ABB Schweiz AG 5400 Baden (CH)	(72) Inventors: SUBRAMANIAN, Sasitharan 771 32 Ludvika (SE) JIANG, Hongbo 781 91 Borlänge (SE) JIANG-HÄFNER, Ying 771 42 Ludvika (SE) (74) Representative: Axell, Kristina  ABB AB Intellectual Property Forskargränd 7 721 78 Västerås 721 78 Västerås (SE)