(19)

(11)

EP 1 794 874 A1

(12)

(43) Date of publication: 13.06.2007 Bulletin 2007/24 (21) Application number: 05793398.8 (22) Date of filing: 29.08.2005

(51) International Patent Classification (IPC):  H02M 5/42(2006.01) H02M 7/68(2006.01) H02M 7/04(2006.01) H02M 7/00(2006.01) (86) International application number: PCT/US2005/030695 (87) International publication number: WO 2006/031427 (23.03.2006 Gazette 2006/12)

(84) Designated Contracting States: DE GB (30) Priority: 30.08.2004 US 930172 (71) Applicant: ADVANCED ENERGY INDUSTRIES, INC. Fort Collins, CO 80525 (US)	(72) Inventors: HESTERMAN, Bryce, L. Fort Collins, CO 80525 (US) ILIC, Milan Fort Collins, CO 80528 (US) MALININ, Audrey, B. Fort Collins, CO 80525 (US) (74) Representative: Gill, David Alan  W.P. Thompson & Co., 55 Drury Lane London WC2B 5SQ London WC2B 5SQ (GB)