A Unified Control for a Soft-Switched Dual Active Bridge DC-DC Converter

The Dual Active Bridge (DAB) is an isolated converter topology that uses a transformer to offer step-up/step-down capability as well as galvanic isolation for the converter. This DAB Converter has intrinsically zero voltage switching (ZVS) capability, but in a very limited power range, if operated in traditional control mode. The ZVS range of different control techniques namely Phase-shift modulation (PSM), single pulse-width modulation (SPWM), and dual pulse-width modulation (DPWM) control modes for different power ranges have been estimated in this paper in an updated and simpler manner. Three different variables: the phase shift between the primary and secondary transformer voltages, the primary voltage width, and the secondary voltage width are used here to manipulate these control schemes. A hardware prototype of a 600W DAB converter using Silicon MOSFET has been designed and developed to operate at 100 kHz switching frequency amalgamating with three control strategies as mentioned above. The performance of the DAB converter has been initially estimated through mathematical analysis and computer simulations in MATLAB Simulink.