In　the　medium-　and　high-capacity　power　applications,　typically　multiple　switches　connected　in　series　and　parallel　are　used　in　power　electronic　converters　to　handle　high　voltages　and　currents.　Powering　the　driving　circuits　and　auxiliary　units　with　high　insulation　requirements　is　challenging.　This　article　proposes　a　modular　multi-output　wireless　power　transfer　(WPT)　system　with　constant-current　(CC)　output　characteristics　for　auxiliary　power　supply.　Compared　with　conventional　solutions,　there　is　no　need　for　complex　control　circuits　and　much　magnetic　material.　The　dual-frequency　topology　with　CC　outputs　is　derived　by　applying　the　analytical　method　that　used　to　obtain　the　dual-frequency　topology　with　constant-voltage　(CV)　outputs.　The　conditions　for　the　system　to　maintain　zero　phase　angle　(ZPA)　at　different　frequencies　are　discussed.　Lower　output　fluctuations　than　single-frequency　multi-output　systems　and　dual-frequency　CV　output　systems　are　verified.　A　magnetic　coupler　with　integrated　compensation　inductors　is　designed　to　eliminate　the　need　for　discrete　inductors　and　improve　the　power　density.　An　experimental　prototype　is　built　to　verify　the　validity　of　the　theory.　The　WPT　system　achieves　an　output　current　fluctuation　of　no　more　than　4.78%,　a　maximum　system　efficiency　higher　than　85%,　and　an　output　power　of　more　than　10　W　at　a　single　port,　which　can　well　meet　the　requirements　of　auxiliary　power　supply.　　©　1986-2012　IEEE.