Paralleling　multiple　phases　of　a　high-frequency　inverter　can　improve　its　current　rating.　Passive　paralleling　is　normally　adopted　due　to　its　simplicity　and　effectiveness　to　balance　the　phase　output　currents.　This　paper　proposed　a　novel　automatic　current　sharing　method　for　a　multiphase　inverter.　An　external　LC　resonant　loop　is　positively　and　negatively　coupled　with　two　adjacent　phases,　respectively.　In　this　way,　no　extra　impedance　is　introduced　for　the　power　flow　path.　However,　an　extremely　large　impedance　is　introduced　for　the　circulating　path　of　imbalanced　currents　so　as　to　suppress　them.　Furthermore,　the　self-inductance　of　the　LC　resonant　loop　can　be　small　to　reduce　the　cost　and　volume.　The　coupled　inductors　for　each　phase　can　be　designed　individually,　allowing　for　modularity　and　expansibility　for　any　phases.　The　mathematical　model　and　the　current　sharing　principle　of　the　proposed　method　are　analyzed　in　detail.　The　inductor-capacitor-capacitor　series　compensated　wireless　power　transfer　(WPT)　system　for　electric　vehicles　is　adopted　as　the　application　scenario.　A　2.2-kW　WPT　experimental　prototype　with　a　three-phase　inverter　verifies　the　effectiveness　of　the　proposed　current　sharing　method.　　©　2015　IEEE.