Research Related The Transmission Efficiency Of Contactless Electrial Power Transfer System

Contactless electrical power transfer technology is a new type of non-contact electric power transmission technology, which transmits energy by electromagnetic coupling. This technology is more secure, convenient and durable and has good development and application prospects compared with the traditional mode. In order to solve the problem to enhance the transmission efficiency, this paper studies some key points of contactless power transmission system, such as compensation topology selection, the enhanced coil and the circuit optimization design, etc. which can improve the transmission efficiency.Firstly, the paper analyzes the different compensation topology structures of the syntony compensation circuit and obtains a method to compute the former vice edge compensation in theory. MATLAB simulation results are demonstrated to show how the the load resistance and working frequency effect the reflected impedance. Experimental results show that the transmission efficiency can increase by 30% compared with the system without compensation capacitor.Secondly, this paper analyzes the enhanced coils of the system and obtains a method to compute the transmission efficiency of system theoretically. The effects of coupling coefficient and quality factor of enhanced coils and the load resistance on load current and transmission efficiency are showed via MATLAB simulation.The experimental results show that the transmission efficiency of system can increase by 7%-15% compared with the system without the enhanced coil.Thirdly, loosely coupled transformer are analyzed and calculation formula of mutual inductance and coupling coefficient are obtained. MAXWELL simulation shows that coupling coefficient can increase by 2%-38% when the primary-secondary side coil uses the same structure and the internal diameter is about 1/2 of the external. Experiment verifies the accuracy of the simulation.Finally, the main circuit and loosely coupled transformer are designed and experiments are conducted to verify the previous analysis.The paper designs a solution which can improve the transmission efficiency of the contactless electrial power transfer by studying relative technology and provides a certain reference significance for subsequent research and application.