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(11)

EP 4 548 469 A1

(12)

(43) Date of publication: 07.05.2025 Bulletin 2025/19 (21) Application number: 23735675.3 (22) Date of filing: 26.06.2023

(51) International Patent Classification (IPC):  H02M 7/483(2007.01) C25B 9/65(2021.01) H02M 3/155(2006.01) H02J 3/18(2006.01) (52) Cooperative Patent Classification (CPC): C25B 9/65; H02M 7/4835; H02M 3/155; H02J 3/18; H02J 2300/30 (86) International application number: PCT/EP2023/067337 (87) International publication number: WO 2024/002978 (04.01.2024 Gazette 2024/01)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 01.07.2022 EP 22182533 (71) Applicant: Hitachi Energy Ltd 8050 Zürich (CH)	(72) Inventors: JOHANSSON, Nicklas 722 46 Västerås (SE) ZHANG, Weichi Beijing 100015 (CN) SVENSSON, Jan 723 46 Västerås (SE) YUAN, ChunMing Beijing 100062 (CN) PAN, Jiuping Raleigh, North Carolina 27606 (US) JAYAN, Vijesh 723 59 Västerås (SE) CHOU, Shih-Feng 723 42 Västerås (SE) (74) Representative: AWA Sweden AB  Matrosgatan 1 Box 5117 200 71 Malmö 200 71 Malmö (SE)