An electronic device (e.g., the electronic device 10 in FIGS. 1 and 2) according to various embodiments may include a coil unit (e.g., the coil unit 200 in FIG. 2), a power transmission circuit (e.g., the power transmission circuit 500 in FIG. 2) electrically connected to the coil unit, and a control circuit (e.g., the control circuit of the circuit board 400 in FIG. 2) set to wirelessly transmit power using the coil unit, and the coil unit may include a first coil (e.g., the first coil 210 in FIG. 2). The first coil may include a first layer (e.g., the first layer 211 in FIG. 3) wound in a first shape specified by a first number of turns, and a second layer (e.g., the second layer 212 in FIG. 3) extending from the first layer and wound in a second shape specified by a second number of turns, the second layer being disposed on the first layer to overlap the first layer.
According to various embodiments, the first shape of the first layer and the second shape of the second layer include a helical wire, and may include a shape of a part of at least one of a circle, an ellipse, or a polygon.
According to various embodiments, the first number of turns of the first layer may be larger than the second number of turns of the second layer, and the diameter of the helical wire forming the first layer may correspond to the diameter of the wire forming the second layer.
