Patent ID: 9472972
Filing Date: 2016-10-18
CPC Classification: H02J

Claim Text:
1. A wireless charging device, comprising: a sensor unit configured to sense an input from an external device and generating a wake-up signal; a control unit, in response to receiving the wake-up signal, configured to exit from a sleep mode to enter an active mode, and configured to generate an activation signal; a detection unit configured to receive the activation signal from the control unit to detect a mobile terminal; and a power supply unit, in response to the detection unit detecting the mobile terminal, configured to wirelessly supply power to the mobile terminal, wherein the detection unit comprises a detection coil configured to detect the mobile terminal, the detection unit is configured to apply a reference current to the detection coil to thereby detect a change in impedance, and the detection unit is configured to apply a current having a level higher than that of the reference current to the detection coil in response to no change in impedance being detected.