Extending the ZVS Operating Range of Dual Active Bridge High-Power DC-DC Converters

GERMÁN G. OGGIER; ROBERTO LEIDHOLD; GUILLERMO O. GARCÍA; ALEJANDRO R. OLIVA; JUAN C. BALDA; FRED BARLOW

Jeju, Korea

Conferencia; 37th IEEE Power Electronics Specialists Conference (IEEE PESC06); 2006

A switching control strategy to extend the soft-switching operating range of the dual active bridge (DAB) dc-dc converter under the zero-voltage-switching (ZVS) operating mode is proposed.  The converter topology consists of two active bridges linked by a high-frequency transformer.  One drawback of this strategy is that soft-switching is only possible in a restricted converter operating region.  A novel pulse width modulation strategy to extend the conventional soft-switching operating mode region and its analysis are presented in this paper.  Experimental results are given in order to validate the theoretical analysis and practical feasibility of the proposed strategy.