Patent ID: 11923698
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 19:
20. A wireless power transmitter comprising:
a detection coil that comprises multiple sub coils, wherein each of the multiple sub coils comprises:
a first part that, when viewed from a first direction, includes a first polygonal shape and is wound in a first winding direction; and
a second part that includes one end connected to one end of the first part, a second polygonal shape different from the first polygonal shape, and that is wound in a second winding direction opposite to the first winding direction, and that is, disposed below the first part when viewed from another direction, and
wherein the second polygonal shape has a same size as the first polygonal shape and is symmetric to the first polygonal shape with reference to one axis when viewed from the first direction;

a transmitting coil configured to supply wireless power to at least one wireless power receiver; and
a control circuit configured to:
obtain, while the wireless power is being transmitted to an outside, a value based on a first voltage value of a first channel corresponding to first sub coils connected to each other among the multiple sub coils and a second voltage value of a second channel corresponding to second sub coils connected to each other; and
identify, based on the obtained value, presence of a foreign object.