In an embodiment, as initiating power is supplied from the wireless power transmitting device 110, the second controller 127 may obtain wireless power efficiency based on information received from by the wireless power receiving device 120 through the second communicator 123, and when the obtained wireless power efficiency is the predetermined value or greater, the second controller 127 may control driving power output from the wireless power receiving device 120 to be provided to the functional part 130 of the second electronic device 20. For example, when the wireless power efficiency is the predetermined value or greater as 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 are aligned with each other, the second controller 127 may control driving power through the wireless power receiver 121 to be provided to the functional part 130 of the second electronic device 20.

In an embodiment, the second controller 127 may turn on a heavy load switch between the wireless power receiving device 120 and the functional part 130 so that driving power may be provided to the functional part 130 of the second electronic device 20.

In an embodiment, as a control signal for turning on the heavy load switch is received from the wireless power transmitting device through the second communicator 123, the second controller 127 may turn on the switch between the wireless power receiver and the functional part so that driving power may be provided to the functional part of the electronic device.