Manufacturing method of a wireless charging coil and wireless charging coil

Abstract

The present invention proposes a manufacturing method of a wireless charging coil and a wireless charging coil. S1: provide a metal plate, if there are impurities on the surface of the metal plate, first clean the metal plate to remove impurities; S2: on the metal plate The surface and / or the lower surface are exposed and developed according to the coil design pattern to form a coil pattern mask, wherein, if the coil pattern masks are formed on both surfaces, the coil patterns on the two surfaces should be symmetrical; Chemical etching, remove the metal in the area outside the coil pattern on the metal plate to form a hollow metal coil plate; S4: After re-cleaning, surface anti-oxidation protection and electroplating protection treatment, the finished coil is formed or cut to form a single Finished coil. The invention can be used in a product environment with limited thickness and space, and the shape of the coil can be made according to different space shape requirements, and the charging efficiency is high.

Description

technical field [0001] The invention belongs to the coil technology, and in particular relates to a coil with a planar structure, such as a coil for wireless charging technology. Background technique [0002] Inductive charging coil or non-contact charging coil is a new charging technology derived from wireless power transmission technology. It can be used for short-distance non-contact wireless charging devices that use the principle of near-field induction conduction to transmit energy. Charge mobile communication devices, PC (personal computer) devices, small smart electronic products, smart wearable products, etc. [0003] For coils used in mobile communication equipment, PC equipment and wireless charging devices for small smart electronic products, the inductance value of the coil is required to be above 12uH, the DC impedance value of the total length of the coil is required to be less than 1ohm, and the efficiency of the entire charging system is required to be great...

AI Technical Summary

Problems solved by technology

[0004] 1. Since the cross-section of the enameled wire winding coil is circular, the cross-sectional area can only be increased by increasing the diameter of the cross-section, and the cross-sectional shape cannot be adjusted according to the actual thickness space that the electronic product can accommodate;

[0005] 2. The winding process can only wind coils with regular shapes such as circular, square and elliptical (limited by the winding process and manufacturing process), and the shape of the coil cannot be designed according to the spatial shape and environment of different products;

[0006] 3. For the coil wound with enameled wire, the flatness error of the entire coil is relatively large, and the error is even greater than 1.5 times the wire diameter. That is to say, if the thickness space of the electronic product is Then only choose The wire diameter of the coil, otherwise the product will not accommodate the coil;

[0007] 4. The coil is easy to fall apart;

[0008] 5. The surface layer of enameled wire needs to occupy a certain thickness of space, which is not conducive to product miniaturization

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