Autonomous wireless charging system and method based on power loss tracking

An autonomous wireless charging system based on power loss tracking, comprising:

• a tray-type case;
• a controller configured to set a basic value or a threshold value based on a power loss value generated in a process of detecting a foreign object;
• a power transmitting coil configured to be moved within a predetermined time in a direction of a tracked position through periodic monitoring of the power loss value so that a wireless device is autonomously charged, and
• circuitry configured to calculate, by using a matrix of sensors, displacement of the position of the wireless device, whether the wireless device is removed, and a displaced direction of the displaced wireless device so as to move the transmitting coil again,
• wherein, when a position of the wireless device is displaced, position tracking is performed again;
• wherein the wireless device is configured to be placed within the tray-type case, and
• wherein a range of movement of a center of the power transmitting coil is restricted to a stroke zone of the tray-type case that is defined by all points that are reachable by a center of a power receiving coil of the wireless device during two-dimensional movement of the wireless device within the tray-type case.