An antenna for wireless power transfer includes a first antenna terminal, a second antenna terminal, at least one inner turn, the at least one inner turn having an inner turn width, and at least one outer turn, the at least one outer turn having an outer turn width, the outer turn width greater than the inner turn width. The antenna further includes a substrate positioned underneath the at least one inner turn and the at least one outer turn and a plurality of separate panes of a magnetic shielding material. Each of the plurality of separate panes are positioned substantially co-planar, with respect to each other, and positioned between the substrate and both the at least one inner turns and the at least one outer turns.

An antenna for wireless power transfer includes a first antenna terminal, a second antenna terminal, at least one inner turn, the at least one inner turn having an inner turn width, and at least one outer turn, the at least one outer turn having an outer turn width, the outer turn width greater than the inner turn width. The antenna further includes a substrate positioned underneath the at least one inner turn and the at least one outer turn and a plurality of separate panes of a magnetic shielding material. Each of the plurality of separate panes are positioned substantially co-planar, with respect to each other, and positioned between the substrate and both the at least one inner turns and the at least one outer turns.

A server includes: a communicator configured to communicate with a plurality of ground power supply devices configured to transmit electric power to a vehicle in a non-contact manner; a storage configured to store at least information on a total power supply amount within a predetermined period of the ground power supply devices; and one or more processors configured to, when a total power supply amount within a predetermined period of one ground power supply device among the ground power supply devices is equal to or greater than a determination threshold value set based on data of the total power supply amount within the predetermined period of the ground power supply devices, determine that stealing or leakage of electricity has occurred in the one ground power supply device.

A server includes: a communicator configured to communicate with a plurality of ground power supply devices configured to transmit electric power to a vehicle in a non-contact manner; a storage configured to store at least information on a total power supply amount within a predetermined period of the ground power supply devices; and one or more processors configured to, when a total power supply amount within a predetermined period of one ground power supply device among the ground power supply devices is equal to or greater than a determination threshold value set based on data of the total power supply amount within the predetermined period of the ground power supply devices, determine that stealing or leakage of electricity has occurred in the one ground power supply device.

A wireless power receiving device includes a first housing, a second housing coupled to the first housing to be changed in relative position with respect to the first housing, a first resonance circuit disposed in the first housing, and at least one processor. The at least one processor may be configured to control the wireless power receiving device to wirelessly receive power from a wireless power transmitting device through the first resonance circuit, identify a charging efficiency corresponding to the received wireless power, and in case the identified charging efficiency is less than a threshold, provide content for changing an angle between the first housing and the second housing.

A wireless charging device according to an embodiment, can effectively discharge heat by including an insulating heat dissipation part in the inner part of a magnetic part or between the magnetic part and a coil part. Therefore, the wireless charging device can be effectively used for a transportation means such as an electric vehicle that requires high-capacity power transmission between a transmitter and a receiver.

A wireless charging device according to an embodiment, can effectively discharge heat by including an insulating heat dissipation part in the inner part of a magnetic part or between the magnetic part and a coil part. Therefore, the wireless charging device can be effectively used for a transportation means such as an electric vehicle that requires high-capacity power transmission between a transmitter and a receiver.

A wireless power receiving device for an electric vehicle is provided. A wireless power receiving device for an electric vehicle, according to an exemplary embodiment of the present invention, comprises: a wireless power receiving coil for receiving wireless power to be transmitted from the outside; a coil support member which has a position fixing means formed at a position corresponding to the wireless power receiving coil so as to fix the wireless power receiving coil, and which is made of a material including a magnetic substance so as to shield the magnetic field; a ferrite core including a plurality of ferrite block bodies which have predetermined areas and which are arranged on one surface of the coil support member so as to be adjacent to each other; and a plate-shaped metal plate for covering one surface of the ferrite core by having a predetermined area.

A wireless power receiving device for an electric vehicle is provided. A wireless power receiving device for an electric vehicle, according to an exemplary embodiment of the present invention, comprises: a wireless power receiving coil for receiving wireless power to be transmitted from the outside; a coil support member which has a position fixing means formed at a position corresponding to the wireless power receiving coil so as to fix the wireless power receiving coil, and which is made of a material including a magnetic substance so as to shield the magnetic field; a ferrite core including a plurality of ferrite block bodies which have predetermined areas and which are arranged on one surface of the coil support member so as to be adjacent to each other; and a plate-shaped metal plate for covering one surface of the ferrite core by having a predetermined area.

Implementations described herein provide systems and methods for wireless charging. In one implementation, a base has a planar surface. One or more posts extend from the planar surface of the base to form a core. Each of the one or more posts is formed from a plurality of nanocrystalline sheets. The plurality of nanocrystalline sheets of each of the one or more posts is oriented in planes perpendicular to the planar surface of the base. One or more coils are wound around each of the one or more posts to form coil windings.