Power supply device

A power supply device comprising:

• a power transmitter configured to supply power to a seat that can slide and rotate relative to a floor part of a vehicle, the power transmitter being provided on the floor part and extending along a slide direction in which the seat slides;
• and
• a power receiver that is provided to the seat and that receives power from the power transmitter in a contactless fashion,
• wherein the power transmitter is provided so that the length dimension thereof in the slide direction is longer than the length dimension thereof in a direction that is orthogonal to the slide direction, and
• a part of the power receiver that receives power from the power transmitter is positioned close to the power transmitter within an installation area of the power transmitter while the seat slides and rotates,
• wherein the power transmitter includes a power transmission coil that is formed by winding a winding wire,
• the power receiver includes a power receiving coil which is formed by winding a winding wire and in which inductive power is generated by magnetic fluxes of the power transmission coil,
• the power transmission coil includes:
• a first annular power transmission coil including a first extended power transmission portion that extends in the slide direction, and
• a second annular power transmission coil including a second extended power transmission portion that extends in the slide direction along the first extended power transmission portion, and in which the direction of a current in the second extended power transmission portion is the same as the direction of a current in the first extended power transmission portion, and
• the power receiving coil includes:
• a first annular power receiving coil that includes a first extended power receiving portion that extends in the slide direction along the first extended power transmission portion when the seat is facing the direction in which the vehicle advances;
• and
• a second annular power receiving coil which includes a second extended power receiving portion that extends in the slide direction along the first extended power receiving portion and the second extended power transmission portion when the seat is facing the direction in which the vehicle advances, and in which the direction of a current in the second extended power receiving portion is the same as the direction of a current in the first extended power receiving portion.