With　the　rapid　development　of　the　new　energy　industry，the　application　demand　of　a　wide　range　of　conditions　is　more　and　more　extensive.　As　the　classical　topology　of　bidirectional　DC-DC　converter，dual　active　bridge　DC-DC　converter　has　the　problems　of　decreasing　soft　switching　range，increasing　current　peak　value　and　current　RMS　value　in　wide　range　applications.　Therefore，this　paper　focuses　on　analyzing　the　influence　of　wide　input　conditions　on　the　characteristics　of　dual　active　bridge　DC-DC　converter　under　triple　phase　shift　control，and　deduces　the　theoretical　expressions　of　the　variation　of　soft　switching　range，current　peak　value　and　current　RMS　with　switching　frequency　under　wide　input　voltage.　On　this　basis，a　phase-shifting　variable　frequency　hybrid　control　strategy　is　proposed.　By　adjusting　the　switching　frequency，the　soft　switching　range　of　the　dual　active　bridge　DC-DC　converter　is　extended，and　the　current　peak　value　and　current　effective　value　are　reduced，and　the　overall　efficiency　of　the　converter　is　improved.　Finally，a　prototype　of　a　1　kW　dual-active　bridge　DC-DC　converter　based　on　SiC　device　is　built　to　verify　the　effectiveness　of　the　proposed　control　strategy.　©　2024　Science　Press.　All　rights　reserved.