Abstract：Taking the switch tube open-circuit fault of dual bridge series resonant DC-DC converter（DBSRC）

as the research object. Firstly，the basic working principle of DBSRC was summarized，and the open circuit fault

characteristics of DBSRC converter were introduced. On this basis，the fault characteristics that can be used for

fault detection and localization after open circuit faults in DBSRC converters were analyzed. A fault detection

strategy based on resonant capacitor voltage，resonant current，and bridge arm current was proposed for DBSRC

converters after open circuit faults. Finally，a simulation model was constructed to verify the effectiveness of the

open circuit fault detection strategy for switching devices.

      Key words：dual bridge series resonant DC-DC converter（DBSRC）；fault detection and localization；switch

tube open-circuit fault detection strategy