EP1458084-A2  CHAN H L ET AL: "Phase-shift controlled DC-DC convertor with bi-directional power flow" IEE PROCEEDINGS: ELECTRIC POWER APPLICATIONS, INSTITUTION OF ELECTRICAL ENGINEERS, GB, vol. 148, no. 2, 12 March 2001 (2001-03-12), pages 193-201, XP006016161 ISSN: 1350-2352;  RUFER A ET AL: "A supercapacitor-based energy storage system for elevators with soft commutated interface" CONFERENCE RECORD OF THE 2001 IEEE INDUSTRY APPLICATIONS CONFERENCE. 36TH IAS ANNUAL MEETING . CHICAGO, IL, SEPT. 30 - OCT. 4, 2001, CONFERENCE RECORD OF THE IEEE INDUSTRY APPLICATIONS CONFERENCE. IAS ANNUAL MEETING, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 4. CONF. 36, 30 September 2001 (2001-09-30), pages 1413-1418, XP010561878 ISBN: 0-7803-7114-3;  HOFSAJER I W ET AL: "A new manufacturing and packaging technology for the integration of power electronics" INDUSTRY APPLICATIONS CONFERENCE, 1995. THIRTIETH IAS ANNUAL MEETING, IAS '95., CONFERENCE RECORD OF THE 1995 IEEE ORLANDO, FL, USA 8-12 OCT. 1995, NEW YORK, NY, USA,IEEE, US, vol. 1, 8 October 1995 (1995-10-08), pages 891-897, XP010193038 ISBN: 0-7803-3008-0US7177163-B2  Chan H L et al: "Phase-shift controlled DC-DC convertor with bi-directional power flow" IEE Proceedings: Electric Power Applications, Institution of Electrical Engineers, GB, vol. 148, No. 2, Mar. 12, 2001, pp. 193-201, XP006016161 ISSN: 1350-2352 * abstract * * figure 1 * * p. 193, left-hand column, paragraphs 2,3 *.;  European Search Report dated Feb. 24, 2006 for corresponding European patent application No. 04005590.;  Hofsajer I W et al: "A new manufacturing and packaging technology for the integration of power electronics" Industry Applications Conference, 1995. Thirtieth IAS Annual Meeting, IAS '95., Conference Record of the 1995 IEEE Orlando, FL, USA Oct. 8-12, 1995, New York, NY, USA, IEEE, US, vol. 1, Oct. 8, 1995, pp. 891-897, XP010193038 ISBN: 0-7803-3008-0 * table 1 * * abstract * * p. 891, right-hand column, paragraph 2 * * p. 894, left-hand column, paragraphs 5,6 * * figure 3 *.;  Rufer A et al: "A supercapacitor_based energy storage system for elevators with soft commutated interface" Conference Record of the 2001 IEEE Industry Applications Conference. 36TH IAS Annual Meeting. Chicago, IL, Sep. 30-Oct. 4, 2001, Conference Record of the IEEE Industry Applications Conference. IAS Annual Meeting, New York, NY: IEEE, US, vol. vol. 1 of 4. CONF. 36, Sep. 30, 2001, pp. 1413-1418, XP010561878 ISBN: 0-7803-7114-3 * figure 9 * * p. 1416, left-hand column, last paragraph * * p. 1417, right-hand column, last paragraph *.