Digital and analog implementations of nonlinear-feedforward controller for a dual-active-bridge converter

Dual-active-bridge (DAB) topology requires a powerful controller to realize voltage conversion and address fast load transients. A controller with nonlinear feedforward and linear feedback loops is able to facilitate a DAB converter to fulfill this requirement. The nonlinear feedforward loop is designed based on the nonlinear model of the DAB converter. The linear feedback loop is realized as a traditional proportional-integral (PI) control. This paper presents two (digital and analog) implementations of the fast dynamic controller with the proposed nonlinear feedforward and linear feedback loops for the DAB converter. The digital implementation is realized using a digital signal processor (DSP), while the analog implementation is built using analog-operational amplifiers and other conventional elements. The experimental results are shown to verify the effectiveness of the proposed implementations.