Patent ID: 9184635
Filing Date: 2015-11-10
Classification: H02J,H04B

Abstract:
1. A wireless power transmitter which wirelessly transmits power to a wireless power receiver, the wireless power transmitter comprising: a transmission resonance coil capable of generating a magnetic field and transmitting the power using resonance to the wireless power receiver that has a resonant frequency value equal to that of the wireless power transmitter; a power source configured to supply the power to the transmission resonance coil; a detector configured to detect an existence state of the wireless power receiver; and a controller configured to determine an existence state of the wireless power receiver, and to control a transmission pattern of the magnetic field according to the determined existence state of the wireless power receiver, wherein the controller controls to generate the transmission pattern of the magnetic field that is pulsed at a predetermined time interval for a specific time if the wireless power receiver does not exists and to generate the transmission pattern of the magnetic field that is continuous if the wireless power receiver exits, wherein the controller determines that the wireless power receiver does not exist if an intensity of the magnetic field detected by the detector is greater than or equal to a preset reference value, wherein the controller determines that the wireless power receiver does exist if the intensity of the magnetic field detected by the detector is less than the preset reference value, and wherein the controller adjusts an intensity of the power based on a variation of the intensity of the magnetic field while the transmission pattern of the magnetic field is continuous.