Samsung patents wireless charger that detects metal objects via signal quality

1. A wireless power transmitting device comprising: a transmission coil; a power providing circuit; at least one controller; and memory storing instructions, wherein the instructions, when executed by the at least one controller individually or collectively, cause the wireless power transmitting device to: control the power providing circuit to apply first power to the transmission coil, identify a quality factor, based on a voltage measured at the transmission coil in response to the first power applied to the transmission coil, control the power providing circuit to apply, to the transmission coil, second power for performing communication with a wireless power receiving device, receive a first response from the wireless power receiving device while applying the second power, based on the received first response from the wireless power receiving device while applying the second power, identify whether the wireless power receiving device has a first power profile for normal charging or a second power profile for fast charging, in accordance with identifying that the wireless power receiving device has the second power profile, receive, from the wireless power receiving device, a second response including information regarding a first reference quality factor of the wireless power receiving device while applying the second power, in accordance with a first difference between the quality factor and the first reference quality factor meeting a designated condition, determine that the wireless power receiving device is placed on a charging area and control the power providing circuit to apply third power to the transmission coil for performing the fast charging, and in accordance with the first difference between the quality factor and the first reference quality factor failing to meet the designated condition, determine that both the wireless power receiving device and a foreign object are placed on the charging area and control the power providing circuit to periodically apply the first power to the transmission coil for determining whether the foreign object in the charging area is removed.