| As a new development direction of power transmission technology, wireless power transmission has considerable transmission distance, transmission efficiency and power, as well as penetrating and non-radioactive characteristics. Therefore, many domestic and foreign scholars are keen to study this technology, At present, great progress has been made in terms of technology. However, there are still some problems to be solved, such as the unification of wireless power transmission theory, the contradiction between power and volume, and the like.This paper studies the wireless charging of electric vehicles, first introduced the types of wireless charging technology, followed by the advantages and disadvantages of each technology and use to understand, and finally chose the magnetic coupling resonant wireless charging technology. In this paper, the research status of wireless charging at home and abroad are studied. Based on the coupled-mode theory, the working models and mathematical equations of the magnetic coupling resonant transmission system are established. The mathematical equations of the system are analyzed and solved. Sufficient and necessary conditions for effective exchangeThis article based on magnetic coupling resonant wireless charging coil shape,a planar coupling coil is designed and simulated by MAXWELL electromagnetic simulation software.The effects of axial and radial changes between the coils on the performance, and the plane coupling coil is optimized by combining the distribution of magnetic force lines. According to four basic compensation topologies, the model and mathematical equations are established, and the simulation is carried out in the MATLAB environment, the compensation method of the primary side series secondary parallel (SP) is selected finally, which can effectively improve the transmission efficiency and output power. Discusses the commonly used inverter circuit topology and control methods, to determine the full-bridge inverter circuit as the inverter circuit.Analysis of the impact of load, space distance, working frequency and the compensation capacitor for transmission efficiency, When the power is near the resonant point, the output power and transmission efficiency are relatively large. However, when the power reaches the maximum value, the transmission efficiency has not been the best, When the transmission efficiency is optimal, the power has been missed the maximum. For the system drive circuit,the rectifier buck circuit is designed. Finally, the hardware platform of the system is built, In the 20cm distance, to achieve 800W power transmission, which verifies the influence of load, space distance, operating frequency and compensation capacitor on the output. |
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