Closed Form Solution for Minimum Conduction Loss Modulation of DAB Converters

An optimal modulation scheme that enables minimum conduction and copper losses is presented for a bidirectional dual active bridge (DAB) dc-dc converter. The considered converter system is employed for an automotive application and comprises of a high voltage (HV) port with port voltage V 1 , 240V ≤ V 1 ≤ 450 V, and a low voltage (LV) port with port voltage V 2 , 11 V ≤ V 2 ≤ 16 V; the rated output power is 2 kW. The closed-form expressions for the optimal control parameters are derived and implementation details are presented in order to facilitate the direct application to a given DAB converter. The paper further details the properties of the presented modulation scheme with respect to switching losses.…