(19)

(11)

EP 2 815 491 A2

(12)

(88) Date of publication A3: 03.04.2014 (43) Date of publication: 24.12.2014 Bulletin 2014/52 (21) Application number: 13705749.3 (22) Date of filing: 13.02.2013

(51) International Patent Classification (IPC):  H02M 1/08(2006.01) H02H 7/122(2006.01) H02M 1/32(2007.01) H03K 17/723(2006.01) (86) International application number: PCT/EP2013/052805 (87) International publication number: WO 2013/174528 (28.11.2013 Gazette 2013/48)

(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 (30) Priority: 24.05.2012 EP 12169314 (71) Applicant: Siemens Aktiengesellschaft 80333 München (DE)	(72) Inventor: WAITE, Philip Perry Newcastle Staffordshire ST5 5EW (GB)