Patent ID: 7109682

Claim:
A contactless power transmitting device, comprising: a power transmitting device; a power transmitting-receiving sharing device; and a power receiving device, wherein the power transmitting device includes: a first coil; and a power transmitting means producing an alternating current supplied to the first coil if electromagnetically coupling the first coil to one of a second coil and a third coil; the power transmitting-receiving sharing device includes: the second coil; a first secondary battery; a power transmitting means producing an alternating current supplied to the second coil using the first secondary battery as a power supply if electromagnetically coupling the second coil to the third coil; and a power receiving means converting an alternating current induced in the second coil to a direct current if electromagnetically coupling the second coil to the first coil to charge the first secondary battery with the converted direct current; and the power receiving device includes: the third coil; a second secondary battery; and a power receiving means converting an alternating current induced in the third coil to a direct current if electromagnetically coupling the third coil to one of the first coil and the second coil to charge the second secondary battery with the converted direct current.