Three transmitting coil coupling mechanism and its magnetic coupling wpt system

Abstract

The present invention provides a three-transmission coil coupling mechanism and its magnetic coupling WPT system. The transmission end includes a first coil, a second coil and a third coil. The first coil is a multi-turn coil formed by winding a single wire. Coil, and constitutes the peripheral charging area, the second coil and the third coil are multi-turn coils formed by another separate wire connected in series in the unwound area inside the first coil and wound in sections, And constitute a central charging area, an unwound area is reserved inside the third coil and between the third coil and the second coil, and the first coil is connected to the first resonance compensation circuit and works At the first resonant frequency, the second coil and the third coil are connected in series and connected to the second resonant compensation circuit and work at the second resonant frequency. The effect is that the anti-offset capability is improved, the system cost is reduced, and it is applicable to mobile device applications of different power levels.

Description

technical field [0001] The invention relates to wireless power transmission technology, in particular to a three-transmission coil coupling mechanism and a magnetic coupling WPT system formed thereof. Background technique [0002] Pure electric vehicles can achieve zero pollution during operation. The popularization of electric vehicles can improve the energy structure, but charging is a major problem for electric vehicles. The traditional plug-in charging method has potential safety hazards, such as charging in rainy or snowy days It is easy to leak electricity, the charging line is aging, and frequent unplugging and plugging can easily generate electric sparks and other problems. Wireless Power Transfer technology (WPT, Wireless Power Transfer r) can overcome the above problems, and has the advantages of high charging convenience, no environmental impact, unattended charging facilities, and low maintenance costs. Magnetic field coupling wireless power transmission technol...

AI Technical Summary

Problems solved by technology

[0003] In the practical application of the electric vehicle WPT system, when the car is parked at the charging position, due to the uncertainty of the driver's human operation, there is a situation where the pickup end in the vehicle chassis and the ground power transmitter are offset, which will reduce the system output power and efficiency, prolong charging time and increase loss, and even make the system unable to work normally in severe cases, so it is necessary to improve the anti-offset ability of the coupling mechanism

At present, research institutions at home and abroad have done a lot of research to improve the anti-offset ability of the magnetic coupling mechanism. In the prior art, some people have proposed a DDQ coil structure. The DD coil and the Q coil are orthogonal to each other. When the two coils are offset, the output Superimposed to reduce the reduction of output power, but with a large amount of copper; someone also proposed a BP coil based on it, saving 25.71% of copper, but compared with the DDQ coil, the coupling performance is slightly lower, and the output power is also lower. lower

Some scholars also connected four D coils in series to form a DLDD structure. In order to reduce weight, the magnetic core was changed to a double "Tian" structure. Although it has a good anti-offset ability, the coil size is large and the amount of wire used is relatively large. Many, the coils are mostly densely wound, and the internal resistance is large, and through analysis, it is found that the anti-offset performance of the above three structures at various angles on the plane is quite different

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