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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
技術領域
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 may also determine the existence or non-existence of the external metal material based on an attenuation factor of the resonant energy and a predetermined reference attenuation factor (threshold value).

FIG. 30 is a flow chart illustrating a method of determining the existence or non-existence of the external metal material according to an embodiment of the present disclosure.

First, the transmission control unit 112 temporarily suspends the operation of the LC resonant circuit of the wireless power transmitter 100 in a periodic manner or when a period of time set by the user has passed (S11). For example, the transmission control unit 112 temporarily suspends the operation of the LC resonant circuit of the wireless power transmitter 100 during a period of time for detecting the existence or non-existence of the external metal material 300 (for example, during a period of time from a time point at which the operation of the LC resonant circuit of the wireless power transmitter 100 suspends to a time point at which resonant energy becomes zero) even in a state that the wireless power receiver 200 is not connected to the wireless power transmitter 100.

The transmission control unit 112 detects an attenuation factor of resonant energy of the LC resonant circuit of the wireless power transmitter 100 when the operation of the LC resonant circuit of the wireless power transmitter 100 suspends (S12).

權利要求

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