(19)

(11)

EP 3 973 626 A1

(12)

(43) Date of publication: 30.03.2022 Bulletin 2022/13 (21) Application number: 19727319.6 (22) Date of filing: 21.05.2019

(51) International Patent Classification (IPC):  H02M 3/07(2006.01) G05F 1/10(2006.01) H02M 1/00(2006.01) (52) Cooperative Patent Classification (CPC): H02M 3/07; H02M 1/0077; H02M 1/007 (86) International application number: PCT/EP2019/063134 (87) International publication number: WO 2020/233803 (26.11.2020 Gazette 2020/48)

(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: KH MA MD TN (71) Applicant: Hitachi Energy Switzerland AG 5400 Baden (CH)	(72) Inventors: DAVIDSSON, Mikael 723 56 Baden (SE) CHEN, Nan 722 10 Västerås (SE) ILVES, Kalle 722 33 Västerås (SE) (74) Representative: AWA Sweden AB  Box 45086 104 30 Stockholm 104 30 Stockholm (SE)