Wireless power transmission device and control method therefor
摘要
說(shuō)明書(shū)
In the above, a method of allowing a wireless power transmitter to detect the type of an external material has been described. Through this, the wireless power transmitter may distinguish a wireless power receiver without any additional communication with the wireless power receiver. Moreover, the present disclosure may provide a method of determining the type of an external material adjacent to the wireless power transmitter to transmit suitable wireless power.
On the other hand, in transmitting wireless power, a current several watts class wireless power transmission system uses in-band communication in which a coil for power transmission is used for communication to share information between the transmitter and receiver.
However, the coil for power transmission is not suitable for a wireless power transmission system transmitting several kilowatts class power since large power flows therethrough. The reason is that an absolute amount of lost power is very large even though a very small reduction of power efficiency for communication occurs when the coil for power transmission is used for communication. Furthermore, the cost of devices used for nodes to which large power is applied is also high, and thus there may be difficulties in using a coil transmitting large power for communication.
Accordingly, a method of using an additional communication module in a wireless power transmission system transmitting and receiving a power of several kilowatts is proposed. A communication method using such an additional communication module may be referred to as out-of-band communication.
