Wireless power transmission device for seat

1. A wireless power transmission device comprising:

a power receiving unit coupled to a lower portion of a seat; and

a power transmitting unit spaced apart from each other and disposed below the power receiving unit,

wherein the power receiving unit is spaced apart from the power transmitting unit and slides along a moving direction of the seat, and the power receiving unit wirelessly receives power from the power transmitting unit and supplies the power to electronic equipment installed in the seat,

wherein the power transmitting unit is arranged along an extending direction of rails coupled to the seat and disposed between the rails, the power transmitting further comprising:

transmitting coils each having a coil shape; and

a wireless power transmitter connected to the transmitting coils below the transmitting coils, wherein the wireless power transmitter receives external power and transmits the power to the transmitting coils and the transmitting coils supplies the power to the power receiving unit,

wherein the power receiving unit further comprises:

a receiving coil spaced apart from the transmitting coils, disposed above the transmitting coils, and wirelessly receiving power through the transmitting coils; and

a wireless power receiver placed above the receiving coil and transferring the power received through the receiving coil to the electronic equipment provided in the seat.

2. The wireless power transmission device of claim 1 , wherein the receiving coil has multiple coil elements, each formed in a coil shape and extending in the extending direction of the rail below the seat, wherein the multiple coil elements of the receiving coil are arranged to be spaced apart in opposite sides.

3. The wireless power transmission device of claim 1 , wherein the transmitting coils are spaced apart from the receiving coils and are formed in a coil shape surrounding the receiving coil, wherein the transmitting coils are spaced apart from each other along an extending direction of the receiving coils,

wherein a portion of a magnetic field generated around each of the receiving coils is offset when power is wirelessly transmitted to the receiving coils through the transmitting coils.

4. The wireless power transmission device of claim 3 , wherein the wireless power transmitter supplies power to the transmitting coils or stop the power supply to the transmitting coils according to an external temperature of the vehicle while a passenger is seated on the seat.

5. The wireless power transmission device of claim 3 , wherein the power transmitting unit further comprises a power conversion unit receiving external power and converting the external power into AC power, the power conversion unit sensing seat movement and a foreign matter through a change in current, voltage, or phase due to movement of the receiving coils.

6. The wireless power transmission device of claim 1 , wherein the power receiving unit transmits unique data stored therein to any one of the transmitting coils positioned directly therebelow and drives any one of the transmitting coils positioned directly below the receiving coil.

7. The wireless power transmission device of claim 1 , wherein the power transmitting unit further comprises a wireless power transmitter coupled to each of the transmitting coils and operating any one of the transmitting coils coupled to an upper portion thereof to transmit power when the receiving coil is positioned directly thereabove.

8. The wireless power transmission device of claim 7 , wherein the wireless power transmitters each wirelessly transmit power to the receiving coil when sensing whether the receiving coil is positioned directly thereabove through a change in a pressure of pressure sensors formed on the rail.