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Charging device having small loop transmission coils for wireless charging a target device

專利號
US10097031B2
公開日期
2018-10-09
申請人
Hong Kong Applied Science and Technology Research Institute Company Limited（HK Shatin）
發(fā)明人
Yan Liu; Jun Chen
IPC分類
H02J7/00; H02J7/02
技術(shù)領(lǐng)域
coil,coils,antenna,loop,charging,small,primary,in,wireless,pair
地域： Hong Kong

摘要

A charging device to wirelessly charge a target device, including: a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna.

說明書

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

FIG. 8 shows a pair of small loop transmission coils 222, wherein a bigger one 222a of the small loop transmission coils 222 is not placed around a smaller one of the small loop transmission coils 222b as is shown in FIGS. 2A, 2B and 2C, but is instead placed side by side with the smaller one 222b according to another embodiment.

As set forth above, according to the embodiments of the present invention, the proposed design of a wireless charging device having multiple small loop transmission coils with different sizes under the coil antenna provides a magnetic field with better uniformity in order to achieve optimal coupling effect, thereby more effectively performing the wireless charging.

Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

權(quán)利要求

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