Title :
Dual active bridge converter with large soft-switching range
Author :
Vangen, Knut ; Melaa, Terje ; Dnanes, Ålf Kare ; Kristiansen, Per Even
Author_Institution :
ABB Corporate Res., Norway
Abstract :
A direct DC low frequency AC dual-active-bridge (DAB) converter with zero voltage switching, resonant transition (ZVS-RT) has been tested at 75 kHz at power levels up to 23 kW. It has dual angle, constant frequency phase shift control, and is soft-switched with high efficiency in a large part of the output V-I plane. There is an optimum set of control angles for each operating point. Efficiency up to 93.3% has been measured at DC output, and 89% at AC output. IGBT dynamic saturation at turn-on from zero current into a positive di/dt is shown to be an important loss factor, together with the diode forward recovery voltage spike. Experiments show the influence of package stray inductance on voltage waveforms and efficiency. The resonant transition is disturbed by semiconductor and stray component effects
Keywords :
bridge circuits; circuit resonance; insulated gate bipolar transistors; optimal control; phase shifters; power convertors; power transistors; switching circuits; voltage control; 23 kW; 75 kHz; 89 percent; 93.3 percent; DC/AC dual active bridge power convertor; IGBT; ZVS; control angles; diode forward recovery voltage spike; dynamic saturation; loss factor; operating point; optimal control; phase shift; resonant transition; soft switching; stray inductance; turn-on; voltage control; waveforms; zero voltage switching;
Conference_Titel :
Power Electronics and Applications, 1993., Fifth European Conference on
Conference_Location :
Brighton
