In　charging　stations,　connecting　the　charging　systems　to　an　medium-voltage　(MV)　dc　bus　in　series　has　become　an　attractive　solution,　which　can　reduce　the　power　loss　and　number　of　devices.　However,　this　kind　of　topology　will　face　the　challenge　of　voltage　imbalance.　This　letter　proposes　a　modular　arrangement　of　wireless　power　transfer　(WPT)　systems　with　self-voltage　balancing　for　charging　stations.　The　dc　voltages　of　the　inverters　are　connected　in　series　to　the　MV　dc　bus.　The　input　voltages　of　the　charging　ports　can　be　balanced　through　the　proposed　simple　voltage　balancing　coils.　Relay　coils　are　added　to　each　WPT　system.　They　are　connected　in　series　to　pick　up　power　from　the　transmitting　coils　and　then　deliver　to　each　receiving　coil.　In　this　way,　the　power　of　each　inverter　can　be　balanced　whenever　in　loading　or　unloading　conditions.　Constant-voltage　output　can　be　achieved　at　each　charging　port.　An　experimental　protype　is　built　to　verify　the　effectiveness　of　the　proposed　system.　　©　1982-2012　IEEE.