METHOD FOR CONTROLLING TO SELECT ONE IN PLURALITY OF COILS IN WIRELESEE POWER TRANSMISSION DEVICE, WIRELESS POWER TRANSMISSION DEVICE THEREOF AND WIRELESS POWER TRANSMISSION SYSTEM THEREOF

摘要

PURPOSE: A power transmission coil selection control method, and a wireless power transmission device and system applying the same are provided to enhance energy efficiency of wireless power transmission by supplying a power signal to a suitable power transmission coil. CONSTITUTION: A first power transmission coil(111) and a second power transmission coil(112) are arranged on a wireless power transmission device(100). A first detection signal and a second detection signal are outputted to wireless power receiving device(200) from the wireless power transmission device. A first response signal and a second response signal corresponding to the first detection signal and the second detection signal are detected in the wireless power receiving device. A coil corresponding to a detected response signal is selected in case one signal among the first response signal and the second response signal is detected.