| Compared with the traditional power supply, the Wireless Power Transfer (WPT)has advantages of safety, convenience, compatibility. Therefore it has great researchvalue and broad application prospects. With the development of technology, thetransfer modes have continuously enriched, which include the Inductive PowerTransfer (IPT), the Magnetic Resonant Wireless Power Transfer (MR-WPT), theMicrowave Power Transfer (MPT), ect.. In recent years, the WPT technologycontributes to many areas covering biomedicine, electric automobiles, householdappliances, etc..This paper focuses on IPT technology for medium-power household appliances.The dual-load inductive power transfer (DIPT) system is designed and its transfercharacteristics are studied.Firstly, the mutual inductance coupling model is used to build the equivalentcircuit model of DIPT system. By theoretical derivation, the indexes of transfercharacteristic are obtained at different compensation structure, specificallyincluding reflected impedance, power transfer capacity, transfer efficiency, thecritical condition of the frequency bifurcation. Utilizing OrCAD and MATLABsoftware, the influence of the various parameters on the transfer characteristics arediscussed, including the coupling coefficient, the resistance of dual load, operatingfrequency, etc.. Meanwhile, the changes of stability state of the IPT system whichswitches from single load to dual-load are analyzed.Secondly, the DIPT system is designed, specifically including hardware circuit(inverter circuit, snubber circuit, etc.), magnetic coupling mechanism. Thesimulation analysis is used for the selection of the compensation structure, andAnsoft Maxwell is used to optimize the coil structure. Finally the DIPT system isestablished with the operating frequency of about60kHz, the output power ofabout700W respectively, maximum efficiency of about92%.Combined with simulation results, the characteristic experiments are performedto verify the transfer characteristics of the DIPT system upon the experimentalplatform, including experiments of changing load, misalignment, comparingone-load situation with dual-load situation. The consistency of simulation andexperiment proves the correctness of transfer characteristics. In addition, MATLAB simulation and experiment are performed to analyze motor load characteristics ofthe IPT system, extending the application of WPT technology in householdappliance.Finally, the power coordination control strategy of DIPT system is discussed byOrCAD simulation and experimental validation. The feasibility analysis of threemethods composed of load adjustment, frequency adjustment, capacitanceadjustment is completed. It can be shown that the capacitance matrix adjustmentmethod perform function of coordinating dual-load power in theory. |
