Device and method for performing power allocation and out-band activation by using short-range communication in wireless power transmission system
A wireless power receiver may comprise: a power pick-up circuit configured to receive power wirelessly from a wireless power transmitter including a plurality of primary coils by magnetic coupling to the wireless power transmitter at an operating frequency and to convert an alternating current signal induced by the wireless power into a direct current signal; a communication/control circuit receiving the direct current signal supplied from the power pick-up circuit and including an in-band communication module which communicates with the wireless power transmitter by using the operating frequency, and an out-band communication module which communicates with the wireless power transmitter by using any frequency except for the operating frequency; and a load configured to receive the direct current signal supplied from the power pick-up circuit, wherein the communication/control circuit transmits a message informing of the start of power allocation negotiation, to other wireless power receivers by using the out-band communication module.
1 . A wireless power transmitter, comprising:
a power converter including a plurality of primary coils and configured to transmit wireless power to a wireless power receiver by using at least one primary coil among the plurality of primary coils forming magnetic coupling with the wireless power receiver at an operating frequency; and
a communicator/controller configured to communicate with the wireless power receiver by using the operating frequency based on in-band communication and communicate with the wireless power receiver by using a frequency different from the operating frequency based on out-band communication,
wherein the wireless power transmitter is configured to:
transmit, to the wireless power receiver, a message including at least one out-band identifier of at least one different wireless power receiver based on the out-band communication, and
receive, from the wireless power receiver, information of a negotiation result based on the out-band communication, and
wherein the information of the negotiation result includes a result of negotiation for power allocation between the wireless power receiver and the at least one different wireless power receiver.
2 . The wireless power transmitter of claim 1 , wherein the wireless power transmitter receives at least one of information on negotiation priority and information on request power of a corresponding wireless power receiver from the wireless power receiver and the at least one different wireless power receiver based on the out-band communication.
3 . The wireless power transmitter of claim 2 , wherein the wireless power transmitter allocates power to each of wireless power receivers among the wireless power receiver and the at least one different wireless power receiver, based on at least one of information on negotiation priority and information on request power of each of the wireless power receivers.
4 . The wireless power transmitter of claim 3 , wherein the wireless power transmitter determines a power transmission target from among the wireless power receiver and the at least one different wireless power receiver, based on the information on the negotiation priority, if power requested by the wireless power receiver and the at least one different wireless power receiver cannot be provided.
5 . A method for transmitting wireless power, the method comprising:
transmitting, to a wireless power receiver, a message including at least one out-band identifier of at least one different wireless power receiver based on an out-band communication; and
receiving, from the wireless power receiver, information of a negotiation result based on the out-band communication,
wherein the information of the negotiation result includes a result of negotiation for power allocation between the wireless power receiver and the at least one different wireless power receiver.