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Wireless power transmission device and control method therefor

專利號
US10097041B2
公開日期
2018-10-09
申請人
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.

說明書

The transmission control unit 112 determines whether or not the detected attenuation factor exceeds a predetermined reference attenuation factor (S13). The transmission control unit 112 temporarily suspends the operation of the LC resonant circuit of the wireless power transmitter 100 when the wireless power transmitter 100 exists alone without the external metal material 300 and the wireless power receiver 200, and then detects an attenuation factor of resonant energy of the LC resonant circuit of the wireless power transmitter 100 in advance, wherein the predetermined reference attenuation factor is defined as the attenuation factor detected in advance.

When the detected attenuation factor exceeds the predetermined reference attenuation factor, the transmission control unit 112 determines that the external metal material 300 is detected (S14).

When the external metal material 300 is detected, the transmission control unit 112 generates information (for example, error code) indicating that the external metal material 300 has been detected, and displays the information on the display unit 141 (S15).

On the contrary, when the detected attenuation factor does not exceeds the predetermined reference attenuation factor, the transmission control unit 112 periodically performs a method of determining the existence or non-existence of the external metal material 300.

FIG. 31 is a flow chart illustrating another method of determining the existence or non-existence of the external metal material according to an embodiment of the present disclosure.

權(quán)利要求

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