Patent ID: 8415834

Claim:
A power feeding system comprising: a power feeder; and power-receiving equipment that receives power fed from the power feeder, wherein the power feeder includes a mount on which the power-receiving equipment is placed, a primary coil, a moving means that makes the primary coil movable, a query output means that is disposed so that the positional relationship to the movable primary coil remains unchanged, and outputs a query to outside using a predetermined medium, a receiving means that when the query is sensed by the power-receiving equipment, receives notification information outputted from the power-receiving equipment, a primary coil direct-current driving control means that when the power-receiving equipment is placed on the mount, as long as the primary coil is made movable by the moving means, controls the primary coil so that the primary coil is driven with a direct current over a certain time length, a query control means that after driving the primary coil with a direct current is begun, allows the query output means to output a query, and a primary coil alternating-current driving control means that after the notification information outputted from the power-receiving equipment in response to the query outputted by the query control means is received by the receiving means, controls the primary coil so that the primary coil can be driven with an alternating current, and the power-receiving equipment includes a secondary coil incorporated to be stationary in the power-receiving equipment, a sensing means that is disposed at a position in the power-receiving equipment at which when the positional relationship between the primary coil and secondary coil falls within a proper range, the sensing means can sense the query, a secondary coil direct-current driving control means that when the power-receiving equipment is placed on the power feeder, controls the secondary coil so that the secondary coil is driven with a direct current in order to exert attraction with respect to the primary coil which is driven with a direct current, a notification information output means that after the driving with a direct current is begun by the secondary coil direct-current driving control means, when the query is sensed by the sensing means, outputs the notification information, and a secondary coil alternating-current driving control means that after the driving with a direct current is begun by the secondary coil direct-current driving control means, when the query is sensed by the sensing means, controls the secondary coil so that electromotive force induced by the primary coil which is driven with an alternating current is exerted.