Abstract: When the current method is used to control the DC transformer of the DC-DC converter，the

control efficiency is low，the immunity is poor，and the loss detection error is large. In order to solve the existing

problems，a DC transformer control method based on the SRDAB DC-DC converter was proposed. By analyzing

the transient losses of semiconductor devices，the on-state losses of semiconductor devices，the general losses of

transformers and other losses generated during the operation of the DC-DC converter based on the series resonant

dual active bridge（SRDAB），the total loss in the working process of the converter was calculated. Taking the

minimum loss as the goal，the DC transformer control model of the converter was established，and the relevant

constraints were set，and the genetic algorithm was used to solve the DC transformer control model to complete the control of the DC transformer. The experimental result shows that the proposed method has high efficiency，good immunity，small loss detection error and good practical application effect.

      Key words: series resonant dual active bridge（SRDAB）；direct current（DC）transformer；loss analysis；

control model；genetic algorithm