The　rapidly　developing　electric　vehicles　(EVs)　calls　for　improvement　in　the　charging　system　for　the　high-voltage　(HV)　and　low-voltage　(LV)　batteries　in　EVs.　In　the　conventional　EV　charger,　wireless　power　transfer　(WPT),　onboard　charger　(OBC),　and　auxiliary　power　module　(APM)　are　three　separate　structures.　This　paper　proposes　an　integrated　charger　for　WPT,　OBC,　and　APM　by　sharing　power　conversion　stages　with　the　advantages　of　cost　effectiveness　and　high-power　density.　The　transformer　of　OBC　can　be　seen　as　two　strongly　coupled　coils,　and　the　secondary-side　coil　can　be　loosely　coupled　with　the　transmitting　coil　of　the　WPT　system,　serving　as　a　receiving　coil.　A　transformer　can　be　employed　on　the　receiving　side　to　integrate　the　APM　with　WPT.　In　this　way,　the　receiving　coil,　the　compensation　network,　and　the　power　electronics　converter　can　be　shared.　The　integrated　structure　can　work　in　three　modes.　In　the　first　mode　(wireless　charging　mode)　and　the　second　mode　(conductive　charging　mode),　the　utility　delivers　power　to　the　HV　and　LV　batteries　simultaneously.　In　the　third　mode　(HV-LV　mode),　the　LV　battery　is　charged　by　the　HV　battery　through　APM.　An　experimental　prototype　is　implemented　to　validate　the　proposal.　©　1986-2012　IEEE.