| Compared with wireline power transmission,wireless power transmission technology can transmit power without contact,which is convenient for the diversification of electricity demand and has broad application prospects.In the different wireless power transmission technology,the transmission mode with mature theory and wide application is magnetic coupling induction transmission.Magnetic coupling mechanism is a key part of wireless power transmission.This paper focuses on the study and optimization of magnetic coupling mechanism,and the design of wireless power transmission system to improve the power and efficiency of wireless power transmission.Firstly,the magnetic coupling coil and its mechanism are analyzed and optimized.The magnetic field and inductance of the coil were simulated based on MAXWELL software,and two kinds of conical transmitting coils were designed based on the cylindrical transmitting coil.The coupling laws of magnetic surface cylindrical device,magnetic surface conical device and magnetic core conical device were systematically analyzed,and the optimized structural parameters were obtained.On this basis,the paper designs the corresponding wireless power transmission circuit system.The main circuit of the system includes rectifier filter circuit,stepdown circuit,full-bridge inverter circuit,compensation circuit,magnetic coupling mechanism,etc.The control circuit takes TMS320F28335 as the control core,including detection circuit,drive circuit and auxiliary power supply.The paper also completed the transmission system PWM driver,analog-to-digital conversion program and PI control program,set up the magnetic coupling wireless power transmission test system.The designed magnetic coupling mechanism and system of wireless power transmission are tested and analyzed.The results show that the conical transmitting coil has higher transmission efficiency than the cylindrical transmitting coil under the same conditions,the system efficiency is increased by up to 5%,and the transmission power is also higher under the condition of no coil offset,up to 14.8%.The magnetic surface tapering device has better antioffset performance than the magnetic core tapering device.The input voltage and output load tests of the transmission system show that the efficiency only decreases by 3% when the input voltage decreases by 40%,while the efficiency decreases by up to 20.5% when the load increases from 10Ω to 50Ω,indicating that the system efficiency is greatly affected by the load. |
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