Patent ID: 9711974
Date: 2017-07-18
CPC Classifications: H02J,H04B

Claim:
1. A wireless power transmitting apparatus wirelessly transmitting power to a wireless power receiving apparatus, the wireless power transmitting apparatus comprising: a detector detecting a wireless power transmission state between the wireless power transmitting apparatus and the wireless power receiving apparatus; a transmit power controller generating a control signal to control transmit power based on the detected wireless power transmission state; an AC power generator generating an AC power using a first DC power, wherein the generated AC power is determined based on the control signal; and a transmission coil unit transmitting the AC power to the wireless power receiving apparatus; wherein the AC power generator comprises: a DC-DC converter converting the first DC power into a second DC power, wherein the second DC power is determined based on the control signal; and a DC-AC converter converting the second DC power into the AC power; wherein the detector detects the wireless power transmission state based on a level of an output current of the DC-DC converter, and wherein the detector detects the wireless power transmission state based on a peak-to-peak level of the output current of the DC-DC converter.