As　a　kind　of　DC-DC　converter,　LLC　resonant　converter　can　realize　soft　switching　in　the　full　load　range,　which　makes　it　widely　used　in　high　frequency　cases.　Although　the　LLC　resonant　converter　is　relatively　capable　of　operating　over　a　wide　voltage　range,　a　wide　voltage　range　means　that　it　operates　over　a　wide　frequency　range.　In　this　paper,　a　reconfigurable　split　resonator　LLC　resonant　converter　is　adopted　to　work　in　HGM,　TDM　and　LGM　modes　make　it　achieve　a　quadruplex　voltage　gain.　Due　to　the　excessive　frequency　jump　in　the　switching　process　of　the　three　modes,　the　resonator　peak　current　is　too　large　and　the　output　is　unstable,　a　PWM　transition　control　based　on　switching　buffer　is　designed　in　this　paper.　Through　simulation,　a　model　of　input　voltage　80-500　V　and　output　voltage　24　V　is　established　to　verify　the　feasibility　of　the　scheme.　©　2024　IEEE.