Improving　power　density　and　system　integration　is　a　pivotal　focus　for　wireless　power　transfer　(WPT)　in　portable　devices.　However,　challenges,　such　as　misalignment　tolerance　and　power　fluctuation　persist.　This　letter　introduces　a　robust　solution　utilizing　secondary　independent　PWM　control.　A　coil　structure　combining　solenoids　and　reverse　windings　ensures　passive　misalignment　tolerance,　while　a　grooved　magnetic　core　integrates　the　converter,　optimizing　compactness.　In　addition,　the　secondary　PWM　control　achieves　precise　output　voltage　regulation　without　communication.　A　high-power-density　WPT　prototype　validates　the　proposed　coupler　and　control　method,　demonstrating　less　than　1%　output　voltage　fluctuation　under　a　50%　misalignment　and　maintaining　over　89%　efficiency　at　100　W.　The　secondary　device　is　highly　compact,　measuring　only　60　mm　×　30　mm　×　7.5　mm　and　achieving　power　density　of　7.41　W/cm3　©　1986-2012　IEEE.