The first controller 117 may include various processing or control circuitry and control an overall operation of the wireless power transmitting device 110.

In an embodiment, the first controller 117 may control the wireless power transmitter 111 to supply driving power required for driving the second electronic device 20 including the wireless power receiving device 120 to the wireless power receiving device 120 in a situation where wireless power efficiency is a predetermined value or greater based on information received from the wireless power receiving device 120 through the first communicator 113. The information received from the wireless power receiving device 120 may include a wireless power efficiency value between the wireless power receiving device 120 and the wireless power transmitting device 110. In addition, the first controller 117 may control the wireless power transmitter 111 to supply initiating power to the wireless power receiving device 120 until the wireless power efficiency reaches the predetermined value or greater to prevent and/or reduce a leakage magnetic field.

In an embodiment, when the wireless power efficiency is the predetermined value or greater according to alignment between the wireless power transmission coil included in the wireless power transmitting device 110 and the wireless power reception coil included in the wireless power receiving device 120, the first controller 117 may control the wireless power transmitter 111 to supply driving power to the wireless power receiving device 120.