EP1758194-A2  ANDERSEN G K ET AL: "A new green power inverter for fuel cells" 33RD.ANNUAL IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE. PESC 2002. CONFERENCE PROCEEDINGS. CAIRNS, QUEENSLAND, AUSTRALIA, JUNE 23 - 27, 2002, ANNUAL POWER ELECTRONICS SPECIALISTS CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 2 OF 4. CONF. 33, 23 June 2002 (2002-06-23), pages 727-733, XP010747467 ISBN: 0-7803-7262-X;  CRUDELE D ET AL: "Commercial and industrial applications getting ready for direct-current power distribution" POWER SYSTEMS CONFERENCE AND EXPOSITION, 2004. IEEE PES NEW YORK CITY, NY, USA 10-13 OCT. 2004, PISCATAWAY, NJ, USA,IEEE, 10 October 2004 (2004-10-10), pages 1676-1681, XP010788021 ISBN: 0-7803-8718-X;  HAN JU CHA ET AL: "A new soft switching direct converter for residential fuel cell power system" INDUSTRY APPLICATIONS CONFERENCE, 2004. 39TH IAS ANNUAL MEETING. CONFERENCE RECORD OF THE 2004 IEEE SEATTLE, WA, USA 3-7 OCT. 2004, PISCATAWAY, NJ, USA,IEEE, 3 October 2004 (2004-10-03), pages 1172-1177, XP010735153 ISBN: 0-7803-8486-5EP1758194-A3  ANDERSEN G K ET AL: "A new green power inverter for fuel cells", 33RD.ANNUAL IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE. PESC 2002. CONFERENCE PROCEEDINGS. CAIRNS, QUEENSLAND, AUSTRALIA, JUNE 23 - 27, 2002, ANNUAL POWER ELECTRONICS SPECIALISTS CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 2 OF 4. CONF. 33, 23 June 2002 (2002-06-23), pages 727 - 733, XP010747467, ISBN: 0-7803-7262-X;  HAN JU CHA ET AL: "A new soft switching direct converter for residential fuel cell power system", INDUSTRY APPLICATIONS CONFERENCE, 2004. 39TH IAS ANNUAL MEETING. CONFERENCE RECORD OF THE 2004 IEEE SEATTLE, WA, USA 3-7 OCT. 2004, PISCATAWAY, NJ, USA,IEEE, 3 October 2004 (2004-10-03), pages 1172 - 1177, XP010735153, ISBN: 0-7803-8486-5;  CRUDELE D ET AL: "Commercial and industrial applications getting ready for direct-current power distribution", POWER SYSTEMS CONFERENCE AND EXPOSITION, 2004. IEEE PES NEW YORK CITY, NY, USA 10-13 OCT. 2004, PISCATAWAY, NJ, USA,IEEE, 10 October 2004 (2004-10-10), pages 1676 - 1681, XP010788021, ISBN: 0-7803-8718-X