A. CLASSIFICATION OF SUBJECT MATTER . INV. H02M11/00 H02N11/00 According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) H02N H02K H02M Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practical, search terms used) EPO-Internal C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. EP 0 758 159 A2 (NIPPON ELECTRIC CO [JP]) 1-12 12 February 1997 (1997-02-12) page 5 , line 21 - page 6 , line 39; figures 5,11 GEORGAKIS D ET AL: "Operation of a 1-12 prototype nucrogrid system based on micro-sources equipped with fast-acting power electronics interfaces" POWER ELECTRONICS SPECIALISTS CONFERENCE, 2004. PESC 04. 2004 IEEE 35TH ANNUAL AACHEN, GERMANY 20-25 JUNE 2004, PISCATAWAY, NJ, USA, IEEE, US, 20 June 2004 (2004-06-20), pages 3521-3526, XP010739478 ISBN: 0-7803-8399-0 the whole document X I Further documents are listed in the continuation of Box C. See patent family annex. * Special categories of cited documents : $^{1}$T1 later document published after the International filing date or priority date and not in conflict with the application but "A" document defining the general state of the art which is not cited to understand the principle or theory underlying the considered to be of particular relevance invention $^{1}$E1 earlier document but published on or after the international "X" document of particular relevance; the claimed invention filing date cannot bs considered novel or cannot be considered to $^{1}$L" document which may throw doubts on priority claim(s) or involve an inventive step when the document is taken alone which is cited to establish the publication date of another Y" document of particular relevance; the claimed invention citation or other special reason (as specified) cannot be considered to Involve an inventive step when the $^{1}$O" document referring to an oral disclosure, use, exhibition or document is combined with one or more other such docu‹ other means ments, such combination being obvious to a person skilled "P" document published prior to the International filing date but In the art. later than the priority date claimed ’& ■ document member of the same patent family Date of the actual completion of the International search Date of mailing of the international search report 28 August 2007 13/09/2007 Name and mailing address of the ISA/ Authorized officer European Patent Office, P.B. 5818 Patentlaan 2 NL - 2280 HV Rijswijk TeI. (+31-70) 340-2040, Tx. 31 651 epo nl, Fax: (+31-70) 340-3016 von Rauch, Marianne Form PCT/ISA/210 (second sheet) (April 2005)