Method for designing PCB coil device of wireless power transmission system

Abstract

The invention discloses a method for designing a PCB coil device of a wireless power transmission system; the method is characterized in that an excitation-load coil and a transmitting-receiving coil are designed on one or more layers of circuit boards by adopting a PCB to be printed into a PCB coil device of a two-coil system, a four-coil system or a relay coil system. Compared with the prior art, the coil device has the advantages of being small in equipment size, improving coil parameter precision and the like, the coil device can be attached to the surface of the equipment, the advantage of improving the miniaturization and attractiveness degree of the equipment is high, the transmission power and efficiency are high, and the skin effect and proximity effect of coils are greatly reduced. The method has high practical application value and commercial advantages in the field of future wireless power transmission.

Description

Technical field: [0001] The invention relates to the technical field of wireless power transmission, in particular to a method for designing a PCB coil device used in a wireless power transmission system. Background technique: [0002] Wireless power transmission technology can transmit energy to the load end without physical wire contact, and has a wide range of applications in future mobile electrical equipment, especially in mobile phones, robots, electric vehicles and other fields. The basic principle is to use the high-frequency changing magnetic field as the transmission medium, use two coils with the same resonance frequency, one as the transmitting end and the other as the receiving end, after the current of the resonant frequency is passed through the transmitting end, it will be in the surrounding A changing magnetic field of the same frequency is generated, and when the coil at the receiving end is within a certain magnetic field range, a resonant current of the s...

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Problems solved by technology

The structure of the helical tightly wound coil is relatively simple, but this type of coil has a large volume because the wires are concentrated in one place, and because the coil is tightly wound, the heating and deformation of the wire are more difficult problems; the planar spiral The shape of the coil is similar to a disc-type mosquito coil. The radius of the coil gradually expands but they are all on the same plane to form a disc-shaped coil. Because its thickness is only one turn, this type of coil can be made relatively thin and is suitable for various types of equipment. Integration, greatly reducing the volume of the device, but the radius of each coil of this type of coil is inconsistent, so there is a certain directionality, and the transmission effect will also decrease when the coil deviates greatly; the space spiral structure coil is like For the springs seen in daily life, this type of coil has a large volume, and uses the natural resonant frequency of the coil to achieve resonance, so no external capacitor is needed, but this type of coil is prone to deformation, the humidity and temperature of the environment and the wire itself. Heat and expansion will have a great impact on the parameters of the coil

[0006] To sum up, the wireless power transmission device in the prior art has a large size, takes up equipment space, is difficult to match resonance, and has relatively large skin effect and proximity effect

Although there are practical use cases for PCB coils, they are currently designed with single-strand uniform wires. Because the current carried by the planar wires is small, there are also skin effects and proximity effects. Uneven heating of the wires causes deformation of the PCB coils, which in turn affects the system. overall parameters

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