Patent ID: 9735623
Date: 2017-08-15
CPC Classifications: B60L,H02J,H04B,Y02T

Claim:
1. A method of controlling power transmission of a wireless power transmitter, the method comprising: transmitting, by a resonance signal generator, first power for detecting a change of load; transmitting, by the resonance signal generator, second power having a first magnitude for communicating with a wireless power receiver, if the change of load is detected; increasing a magnitude the second power to a second magnitude which is greater than the first magnitude; receiving, by a wireless communication unit, a network subscription request message from the wireless power receiver, while transmitting the second power; transmitting, by the wireless communication unit, an approval message to the wireless power receiver; and transmitting, by the resonance signal generator, third power to the wireless power receiver, wherein the third power is used for charging in the wireless power receiver.