Data communication method for wireless charging and electronic device using same

A wireless charging transmitter, comprising:

• a coil;
• a wireless charging circuit electrically connected to the coil;
• and
• a controller operatively connected to the wireless charging circuit,
• wherein the controller is configured to:
• when the controller receives a request for performing wireless charging from a wireless charging receiver, transmit configuration information to the wireless charging receiver;
• when the wireless charging receiver requests identification information as a response to the transmission of the configuration information, transmit the identification information including information on a maximum transmittable wireless power;
• receive a request for encrypted authentication information from the wireless charging receiver, as a response to the transmission of the identification information;
• transmit the encrypted authentication information in response to the request for the encrypted authentication information;
• when the wireless charging receiver transmits an authentication completion message as a response to the transmission of the encrypted authentication information, transmit a second predetermined power to the wireless charging receiver;
• and
• when the wireless charging receiver transmits an authentication failure message as a response to the transmission of the encrypted authentication information, transmit a first predetermined power that is lower than the second predetermined power to the wireless charging receiver regardless of the wireless charging transmitter is configured to transmit the second predetermined power.

A method for wirelessly charging an electronic device, comprising:

• through a wireless charging circuit, requesting identification information from an external device;
• receiving the identification information of the external device from the external device;
• determining whether the external device can transmit a first predetermined power or a second predetermined power, based on the identification information of the external device;
• in response to determining that the external device can transmit the second predetermined power, requesting encrypted authentication information from the external device so as to perform authentication with respect to the external device;
• when the external device is an unauthenticated device, requesting the external device to transmit a first predetermined power regardless of whether the external device is configured to transmit the second predetermined power;
• and
• when the external device is an authenticated device, requesting the external device to transmit a second predetermined power that is higher than the first predetermined power.