Title :
Piecewise Linear Model for Snubberless Dual Active Bridge Commutation
Author :
Farhangi, Babak ; Toliyat, Hamid A.
Author_Institution :
Texas A&M Univ., College Station, TX, USA
Abstract :
A dual active bridge (DAB) converter promises high power density. The highest power transfer can be achieved by phase shift modulation inside the zero-voltage switching boundaries. This paper analyzes the transients of DAB commutation. Although commutation has been previously analyzed for DAB with the linear turn-off snubbers, in today´s industries, the output capacitors of the switches are utilized as the snubberless approach. The presence of these time-variant capacitors leads to nonlinear equations. This paper applies a piecewise linear model for analyzing the commutation of the ac-link current into the switches. The study is inspired by practical experiments, and the results are experimentally verified.
Keywords :
DC-DC power convertors; bridge circuits; capacitors; nonlinear equations; piecewise linear techniques; snubbers; AC link current; DAB converter; high power density; isolated DC-DC converter; linear turn-off snubber; nonlinear equation; piecewise linear model; snubberless dual active bridge commutation; time-variant capacitor; Batteries; Bridge circuits; Capacitors; Inductors; MOSFET; Mathematical model; Switches; Battery charger; MOSFET; deadtime; high frequency ac link; high-frequency ac link; isolated dc-dc converter; isolated dc???dc converter; metal???oxide???semiconductor field-effect transistor (MOSFET); physics based modeling; physics-based modeling; series ac link; state space model; state-space model; transient analyses; transient anlyzes;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2015.2434803