In　order　to　widen　voltage　gain　of　bidirectional　on-board　charger　to　meet　requirements　of　electric　vehicle　with　different　voltage　levels,　a　novel　bidirectional　five-level　multimode　CLLC　resonant　converter　is　proposed　by　combining　the　CLLC　resonant　tank　module　(RTM)　with　the　five-level　cascaded　neutral-point　clamp　active　bridge　which　is　composed　of　two　three-level　neutral-point　clamp　(3L-NPC)　bridge　arms.　Furthermore,　the　converter　can,　respectively,　establish　three　voltage　gain　modes　of　high,　medium,　and　low　to　effectively　widen　voltage　gain　adjustment　capabilities　through　the　fixed-frequency　plus　phase-shift　hybrid　modulation　independently　adopted　in　each　3L-NPC　bridge　arm,　while　soft-switching　is　realized　by　phase　control　between　resonant　current　and　input　voltage　of　RTM.　Meanwhile,　the　key　parameters　of　RTM　would　be　symmetrically　designed　to　make　bidirectional　power　transmission　characteristics,　which　become　consistent　based　on　soft-switching　and　monotonic　voltage　gain　control.　Finally,　according　to　the　simulation　platform　and　experimental　prototype,　it　can　be　shown　that　the　practical　voltage　gain　is　close　to　the　theoretical　design　gain　and　converter　has　good　dynamic　performances　after　realizing　soft-switching　in　each　mode.　©　1986-2012　IEEE.