1. Field
The following description relates to a coil device including a plurality of coils, and an apparatus including the same.
2. Description of Related Art
Wireless power transfer technology of wirelessly transmitting power through a coil and wirelessly receiving the wirelessly transmitted power has been widely applied to chargers of various communications apparatuses including smartphones and a number of home appliances, and may in future also be applied to electric vehicles. Various attempts have been made to improve coils used to transmit and/or receive wireless power in order to improve charging efficiency, increase a device's lifespan, and to improve performance of a circuit.