Research On Radio Energy Transfer System For Artificial Hearts Based On Curved Coil Coupling

A significant population worldwide faces the need for heart transplant surgery to regain their health,while the availability of heart donors is limited.During the waiting period for transplantation or as a direct substitute for a failing heart,patients require artificial hearts for life-sustaining purposes.The development of artificial hearts has progressed,and the incorporation of wireless energy transfer technology has the potential to revolutionize their usage.The advantages of wireless energy transfer lie in its ability to transmit radio energy through the human body,eliminating the need for long-term presence of wires and reducing the risk of wound infections.This study aims to enhance the coupling module of the wireless energy transfer system by employing curved coil configurations.By adapting commonly used planar spiral coils to a curved shape that conforms more effectively to the elliptical thoracic cavity,the comfort level for patients wearing the system can be improved.Additionally,using COMSOL simulation,the influence of the curvature radius of the curved coils on the coupling coefficient is investigated to increase the efficiency of radio energy transfer.Experimental results demonstrate that the curved surface emitter coil offers over 10%higher coupling coefficient compared to the flat spiral coil at a curvature radius of π/4,and the curved surface coil with a curvature radius of π/6,more suitable for coil misalignment,provides an 8% improvement in coupling coefficient within the operating range.This thesis focuses on the following research objectives:(1)Conducting a literature review to explain the background and significance of the research topic,as well as the progress in artificial heart research both domestically and internationally,and the state of research on wireless energy transfer systems.Categorizing wireless energy transfer research into three main areas: coil design for improved transmission efficiency,circuit topology optimization to reduce losses,and wireless energy transfer system design for different working scenarios.(2)Analyzing and comparing four compensating circuit topologies and selecting the series-series topology as the compensation structure for the wireless energy transfer system.Theoretical analysis of commonly used inverter topologies and energy conversion calculations in circuit operation.Analyzing and selecting suitable coupling mechanisms for artificial hearts and choosing appropriate coil configurations for different shapes.(3)Improving the transmission performance of coupling mechanisms for wireless energy transfer to artificial hearts.Enhancing commonly used spiral coil-based coupling mechanisms by curving the coils.Curved surface coils offer advantages in close adherence to the skin surface.Utilizing COMSOL Multihysics software to simulate different curvature radii of curved surface coils and evaluating their impact on mutual inductance.Simulation results demonstrate that curved surface coils have more significant effects on coupling coefficients compared to flat spiral coils.(4)Establishing models for different curvature radii of wireless energy transfer system coupling mechanisms during the simulation process.Building a complete experimental system to validate the influence of curved surface coils on the wireless energy transfer process.Finally,experimental results indicate that curved surface coils provide system gains,particularly with more pronounced curvature variations.