Research On The Wireless Charging System Performance Optimization Based On The Compact Receiver

Recently,wireless charging systems(WCS)have been widely used in medical devices,electric vehicles,and consumer electronics due to their flexibility,safety,no plug and pull,and no manual operation.Then the charging device form is extended,starting a new power supply mode.Among the numerous application scenarios,the unmanned aerial vehicle(UAV)is greatly suitable for the WCS due to the limited cruising distance and periodic mass tasks.However,UAV severs as the WCS receiver,considering the UAV capability,a compact receiver can effectively reduce the weight and volume.The three aspects below are mainly focused on designing a compact receiver: WCS system structure simplification,light receiver coil and integrated coupler,and primary-side control omitting the secondary-side control module.Above all,three WCSs are proposed based on the compact receiver design methods.Firstly,considering the methods above,the LCC-None compensation topology is adopted to omit the capacitor.A light receiver coil is designed to optimize the magnetic coupler,and the primary-side control based on DC-DC converter duty cycle regulation is utilized.Comparing the LCC-None with LCC-S,simulating the coupler performance,and the closed-loop control verification confirms the feasibility of WCS with a compact receiver.Secondly,based on the compact receiver design,the SS topology combined with a magnetic flux-controlled inductor(MFCI)is utilized.Then the detuned SS topology and asymmetrical coupler ensure a wider charging zone,and the light receiver coil is designed at the same time.The primary-side controller based on MFCI inductance regulation fulfills the power control,omitting the receiver control module.With the analysis of MFCI,detuned SS topology,and coupler performance,the WCS feasibility with a compact receiver is proved.In addition,the compact receiver design is extended to the magnetic coupler.The current ripple elimination and anti-misalignment capability are also considered.The WCS uses the secondary-side interleaved Buck(SIBC)converter to reduce the current ripple.In addition,the compensation inductor and SIBC filter inductors are integrated with the coupler,improving the coupler’s compactness.The SIBC closed-loop controller small-signal model is designed and realizes the power control.The proposed WCS feasibility is verified by the coupler decoupling performance,output current ripple characteristics,and misalignment tolerance.Finally,the experimental platforms are built,respectively,and the results verify the advantages of the three WCSs with the compact receiver.