Cordless　kitchen　appliances　powered　by　wireless　power　transfer　(WPT)　technology　can　operate　without　the　clutter　of　cords,　making　them　safer　and　easier　to　clean.　In　order　to　allow　cordless　kitchen　appliances　to　be　placed　more　freely,　this　article　proposed　a　parity-time　(PT)　symmetric　WPT　system　with　stable　output　power　in　the　whole　coupling　range.　Here,　a　new　implementation　of　a　PT-symmetric　circuit　using　a　combination　of　self-oscillating　methods　and　pulsewidth　modulation　(SO-PWM)　is　presented.　The　self-oscillating　mode　is　activated　in　the　strong　coupling　region,　which　guarantees　a　constant　output　power　and　constant　transfer　efficiency　against　the　coupling　coefficient　variation.　In　the　weak　coupling　region,　the　PWM　mode　with　a　fixed　frequency　and　a　variable　duty　cycle　is　adopted,　and　a　control　strategy　based　on　primary-side-only　parameters　is　presented　to　obtain　stable　power　transmission.　Besides,　a　corresponding　coupling-region　detection　method　based　on　the　reflected　resistance　is　proposed　to　ensure　smooth　switching　between　SO　mode　and　PWM　mode.　The　advantage　is　that　the　stable　output　power　can　be　maintained　in　the　whole　coupling　region　without　any　extra　dc-dc　converter　and　dual-side　communication　requirements,　while　maintaining　the　same　transfer　efficiency　as　the　standard　PT-symmetric　WPT　system.　A　500-W　experimental　prototype　is　built　to　verify　the　theoretical　analysis.　The　results　show　that　with　a　transfer　efficiency　of　over　91.6%,　the　misalignment　tolerance　can　be　increased　by　172%.　©　1972-2012　IEEE.