Maximum efficiency point tracking algorithm for dual active bridge converters

Abstract

This paper presents an algorithm for seeking the most suitable operating point and the maximum efficiency in respect of the operating conditions in a dual active bridge converter. The method is the most suitable for half-bridge variants of the dual active bridge since the previously presented modulation methods are derived only for full-bridge configurations. The maximum efficiency point tracking method is based on a perturb-and-observe type tracker and a variable frequency modulation method where the turn-on currents of the primary and secondary bridges can be adjusted by using closed-form expressions.