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Wireless power transmission device and control method therefor

專利號(hào)
US10097041B2
公開(kāi)日期
2018-10-09
申請(qǐng)人
LG ELECTRONICS INC.（KR Seoul）
發(fā)明人
Byungsang Jung; Beomseok Chae; Yongcheol Park; Kyunghwan Kim
IPC分類
H02J50/12; H02J50/80
技術(shù)領(lǐng)域
power,wireless,receiver,resonant,unit,may,coil,in,control,lc
地域： Seoul

摘要

The present specification which relates to a wireless power transmission device and a control method, capable of transmitting and receiving power wirelessly comprises a power supply unit for supplying power to a receiving device to transmit power wirelessly; and a power transmission control unit for, periodically generating a waveform with a particular frequency, measuring an attenuation coefficient of the waveform at each cycle, measuring a variation in the attenuation coefficient at each cycle, and determining the type of an external material. The present invention has a technical feature wherein the power transmission control unit determines whether to transmit power wirelessly to the receiving device on the basis of the type of the external material.

說(shuō)明書

The transmission control unit 112 may detect a variation of attenuation factors for each period. More specifically, referring to FIGS. 38, 39 and 40, it is seen that the attenuation factor for each period for one waveform gradually decreases.

More specifically, FIG. 38 illustrates an attenuation factor for a first period of the waveform, and FIG. 39 illustrates an attenuation factor for a second period of the waveform, and FIG. 40 illustrates an attenuation factor for a third period of the waveform. As shown in FIGS. 38 through 40, it is seen that the attenuation factor of the waveform gradually decreases.

A variation of attenuation factor may vary according to the type of an external material. For example, a variation of attenuation factor between a receiver of wireless power and an external device incapable of receiving wireless power may vary.

Through this, the transmission control unit 112 may detect the type of an external material based on a variation of the attenuation factor. More specifically, when a variation of the attenuation factor corresponds to a preset reference variation, the transmission control unit 112 may detect a receiver formed to receive wireless power.

Subsequent to detecting the external material, a wireless power transmitter according to an embodiment of the present disclosure may carry out the process of determining whether or not to transmit power to the external material in an wireless manner based on the type of the external material (S340).

權(quán)利要求

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