Design And Research Of Loosely Coupled Structure For Inductively Coupled Power Transfer

Inductively Coupled Power Transfer(ICPT)has attracted worldwide attention for its flexible and changeable energy transmission mode and ability to provide Power supply safety under severe environmental conditions.Magnetic coupler is an indispensable part of radio energy transmission system.The wide application of this technology in industry will make the way of electric energy production,transmission,distribution and use wider and more diverse.The traditional way of electric energy transmission is to make use of the electrical conductivity of metal materials and rely on the direct physical contact between metal conductors to carry out electric energy transmission.This way of transmission has problems such as electric spark,which affects the security and reliability of system power supply and even causes explosion,which is the drawback of causing major accidents.However,the emergence of magnetic couplers applied in radio energy transmission technology effectively overcomes a series of shortcomings and deficiencies brought by the traditional physical contact transmission mode of metal conductor,such as wear,spark,inflexibility,etc.,and has been widely concerned and studied in the world.The wide application of ICPT technology is inseparable from its security and convenience,but the energy transmission efficiency of its system is a disadvantage compared with that of traditional wired charging.As one of the core components of ICPT system,magnetic coupler determines the energy transmission efficiency of the whole radio energy transmission system to a great extent.Therefore,the design of magnetic coupler is an important work in ICPT system design.The paper studies and designs the ring loose coupling transformer among the various magnetic couplers that can be used in inductive radio energy transmission system,and analyzes the radio energy transmission system using ring magnetic couplers.Finally,an experimental platform is set up in the laboratory to verify the feasibility and correctness of the design method in the paper.Paper briefly analyzes the induction radio the basic structure of the transmission system,and based on ring loosely coupled transformer principle and the principle of electromagnetic induction,establishing electromagnetic induction type radio transmission system transmitting terminal coil and the analysis of the receiver coil model,USES the loose coupling transformer model of mutual inductance to electromagnetic induction type radio transmission system modeling and analysis;Then the working frequency and resonant frequency of the system are selected to analyze the influence of the traditional LC compensation topology,compensation capacitance parameters and mutual inductance parameters between coils on the radio energy output characteristics.In simulation software ANSYS MAXWELL loosely coupled transformer electromagnetic simulation model is established,simulated air environment impact on the transmission properties of ring loose coupler,comparison and analysis on the magnetic properties of magnetic coupler under different medium,the ring of loosely coupled transformer magnetic circuit model for electromagnetic simulation and design analysis and carries on the electric simulation,Finally,combining the magnetic circuit model of ring loosely coupled transformer and the circuit model of radio energy transmission system,a design process of ring magnetic coupler applied to radio energy transmission system is summarized and a ring loosely coupled transformer is made.The hardware experiment platform of electromagnetic induction radio energy transmission system was built based on ring loosely coupled transformer,and the inductance parameters were measured.The compensation capacitance and power device models used in the system were selected.The test results show that the maximum load power of the ring-type loosely coupled transformer in the radio energy transmission system is 2kW,and the system efficiency of the whole transformer is more than 90%.