This　article　proposed　an　autonomous　wireless　power　transfer　system　with　misalignment　tolerance　and　improved　control　degree　of　freedom　based　on　detuning　control　for　battery　charging,　in　which　the　outputs　can　be　regulated　continuously　and　smoothly　without　additional　dc-dc　converters　while　maintaining　soft-switching　or　zero-phase-angle　operation　of　the　inverter.　Theoretical　analysis　shows　that　constant　current　(CC)　or　constant　voltage　(CV)　independent　of　coupling　coefficient　and　load　can　be　achieved　without　information　exchange　between　transmitter　and　receiver,　which　eliminates　wireless　communication.　Furthermore,　when　the　detuning　ratio　is　controlled　to　be　constant,　a　transfer　efficiency　insensitive　to　the　variation　of　the　coupling　coefficient　can　be　obtained.　A　prototype　with　a　6-A　charging　current　and　a　36-V　charging　voltage　is　built　to　support　the　feasibility　of　the　proposed　method.　Experimental　results　demonstrate　that　within　the　coupling　coefficient　range　of　0.283-0.456,　CC　and　CV　with　transfer　efficiency　greater　than　91.5%　can　be　achieved.　©　1986-2012　IEEE.