| Title |
Study on Small-signal Modeling and Controller Design of DC-DC Dual Active Bridge Converters |
| Authors |
Won-Bin Lee ; Hyun-Jun Choi ; Jin-Tae Cho ; Jee-Hoon Jung |
| DOI |
https://doi.org/10.6113/TKPE/2017.22.2.159 |
| Keywords |
DAB(Dual Active Bridge) converter ; Small signal model ; Controller design ; Generalized average model ; Dynamic performance |
| Abstract |
Small-signal modeling and controller design methodology are proposed to improve the dynamics and stability of a DC?DC dual active bridge (DAB) converter. The state-space average method has a limitation when applied to the DAB converter because its state variables are nonlinear and have zero average values in a switching period. Therefore, the small-signal model and the frequency response of the DAB converter are derived and analyzed using a generalized average method instead of conventional modeling methods. The design methodology of a lead-lag controller instead of the conventional proportional?integral controller is also proposed using the derived small-signal model. The accuracy and performance of the proposed small-signal model and controller are verified by simulation and experimental results with a 500 W prototype DAB converter. |