Research On Topology And Construction Of Multi-load Wireless Power Transfer System With Constant-voltage Outputs

The existing constant-voltage-output multi-load wireless power transfer system topology has many problems,such as short transfer distance,poor load capacity,seriously cross-coupling interference,poor flexibility of adjustnment for output voltage,etc.Therefore,this thesis takes topology as the key research content,and proposes three novel constant-voltage-output multi-load wireless power transfer system topologies,which improve the transmission performance and can help the technology meet the needs of different applications.The research content and innovations include:1.We study the basic principle of achieving constant voltage output based on impedance matching networks,and compare the advantages and disadvantages among different impedance matching networks.We analyze the working principle and construction method of topologies of the constant-voltage-output two-coil single-load and three-coil double-load wireless power transfer system,and summarize the general method of constructing a constant-voltage-output multi-load topology using two-coil and three-coil topologies.The content lays the theoretical foundation for the subsequent proposal of novel multi-load wireless power transfer system topologies.2.To solve the problems of short transfer distance and poor load capacity of the existing topology,we propose a constant-voltage-output bilateral-coupled multi-load wireless power transfer system topology based on the constant-voltage-output three-coil double-load system topology.The proposed topology can adapt to applications that need long-distance power transfer and constant-voltage outputs.This thesis conducts an analysis on the transfer performance of the topology,and verifies the theoretical analysis and feasibility through simulation and experiment.3.To avoid the possible failure caused by serious cross-coupling interference and magnetic saturation of the existing and the above-mentioned topologies,we construct a constant-voltage-output zero-compensation-inductance multi-load wireless power transfer based on the constant-voltage-output two-coil dual-load system topology.We conduct an analysis on the transfer performance and verify the proposed topology by simulation and experiment.As is research shown,the topology does not contain compensation inductance thus avoiding magnetic saturation,and is small in size which makes it cost-effective.4.To address the problem of poor adjustability of output voltages in both the existing and the above-mentioned topologies,we put forward a constant-voltage-output domino multi-load wireless power transfer system topology based on the double-T impedance matching network.As the simulation and experiment show,because each loop operates in series resonance and the output voltage only depends on the ratio of mutual inductances between adjacent loops,the proposed has strong adjustability that helps expand the application range.