Wireless power transmission system, power transmitting device, and power receiving device

摘要

This wireless power transmission system includes: a power transmitting antenna and a power receiving antenna arranged to face each other and not to be in contact with each other; and an electromagnetic shield structure that includes a first shield and a second shield to house, in its inner space, the power transmitting and power receiving antennas facing each other. The first and second shields are configured to make first and second spaces to house the power transmitting and power receiving antennas, respectively. At least one of the first and second shields includes a protruding portion that is parallel to at least one of the power transmitting and power receiving antennas and that protrudes out of the shield sidewalls. Power is transmitted by a non-contact method through a radio frequency magnetic field from the power transmitting antenna to the power receiving antenna.

主权项

1. A wireless power transmission system comprising:
a power transmitting antenna and a power receiving antenna that are arranged so as to face each other and not to be in contact with each other; and an electromagnetic shield structure that houses, in its inner space, the power transmitting and power receiving antennas that face each other and that includes a first shield and a second shield, the first shield including a first flat plate portion that faces the power transmitting antenna and a first shield sidewall that is extended from the edge of the first flat plate portion perpendicularly to the first flat plate portion so as to define a first space to house the power transmitting antenna, the second shield including a second flat plate portion that faces the power receiving antenna and a second shield sidewall that is extended from the edge of the second flat plate portion perpendicularly to the second flat plate portion so as to define a second space to house the power receiving antenna, wherein the power transmitting and power receiving antennas each comprises a respective coil, and the coils of the antennas are extending on respective planes that face each other, wherein the first and second shields include a first protruding portion and a second protruding portion, respectively, and the first and second protruding portions are parallel to at least one of the planes of the power transmitting and power receiving antennas and protrude out of the electromagnetic shield structure from the first and second shield sidewalls, respectively, wherein power is transmitted by a non-contact method through a radio frequency magnetic field from the power transmitting antenna to the power receiving antenna, wherein the first and second flat plate portions, the first and second sidewalls, and the first and second protruding portions are made of a non-magnetic conductive material, wherein the distance from the power transmitting antenna to a surface of the first shield that faces the antenna is G1 and the length from the first sidewall to an edge of the first protruding portion is EL1, and 0.1≦EL1/G1 is satisfied, and wherein the distance from the power receiving antenna to a surface of the second shield that faces the antenna is G2 and the length from the second sidewall to an edge of the second protruding portion is EL2, and 0.1≦EL2/G2 is satisfied.