Research On Key Technologies For Contactless Inductive Electric Energy Transfer System

Contactless inductive power transfer technique is a novel power transfer method, which utilizes the electromagnetic coupling theory to achieve contactless power transfer effectively and safely. Therefore this technique is widely used in many applications such as public transport systems, aviation and space systems, robots, medical plants, lighting, compact electronic devices, mine and water applications.The paper focuses on some key technologies of the contactless inductive power system. Firstly, the main operation principle, research status and development trends are introduced. Some design guide lines are discussed based on the structure of the system. The mutual inductance coupling model of the system is introduced. The circuit impedance is analyzed.The characteristics of the full bridge series resonant converter with the separate transformer are analyzed. The resonant frequency and other circuit characteristics are discussed. The full bridge series resonant converter is analyzed by circuit simulation.The magnetic circuit of the separate transformer is analyzed on the base of the introduction of the characteristics and types of the separate transformer. Transformer parameters influence due to the coil position and air gap is discussed and simulated by means of ANSYS.Finally, test of the separate transformer parameters are performed, and test results of the designed transformer are given. The full-bridge series resonant converter is verified experimentally by using the designed separate transformer. The experimental results for the 4mm and 10mm transformer air gap are given.