Noncontact power feed system, noncontact relay apparatus, noncontract power reception apparatus, and noncontact power feed method

A noncontact relay apparatus, comprising:

• a relay resonance device to receive supply of alternate-current power from a power feed resonance device of a noncontact power feed apparatus by resonance in a noncontact manner and relay the alternate-current power to another electronic apparatus by resonance in a noncontact manner;
• a relay-side rectifier circuit to form direct-current power based on the alternate-current power supplied from the relay resonance device and output the direct-current power;
• and
• a moving means for moving the noncontact relay apparatus by being driven by the direct-current power from the relay-side rectifier circuit.

A noncontact power reception apparatus, comprising:

• a power reception resonance device to receive supply of alternate-current power from a relay resonance device of a noncontact power reception/relay apparatus having a movable structure driven by alternating current supplied by magnetic field resonance in a noncontact manner;
• a power-reception-side rectifier circuit to form direct-current power based on the alternate-current power supplied from the power reception resonance device and output the direct-current power;
• and
• a load means driven by the direct-current power from the power-reception-side rectifier circuit.

A noncontact power feed method in a noncontact power feed system, comprising:

• transmitting, by a first apparatus, alternate-current power via a first resonance coil in a resonance system;
• receiving, by a second apparatus, the alternate-current power transmitted from the first apparatus via a second resonance coil resonating at a frequency that is one of the same and substantially the same as a frequency of the first resonance coil of the first apparatus;
• relaying and transmitting, by the second resonance coil of the second apparatus, the alternate-current power received from the first apparatus;
• moving, the second apparatus by using the alternate-current power received from the first apparatus;
• receiving, by a third apparatus, the alternate-current power transmitted from the second apparatus via a third resonance coil resonating at a frequency that is one of the same and substantially the same as the frequency of the second resonance coil of the second apparatus when the second apparatus comes close to the third apparatus;
• and
• driving, by the third apparatus, a predetermined load circuit by using the alternate-current power received from the second apparatus.

A noncontact power feed method in a noncontact relay apparatus, comprising:

• receiving alternate-current power transmitted from a noncontact power feed apparatus via a reception and transmission resonance coil resonating in a non-contact manner at a frequency that is one of the same and substantially the same as a frequency of a transmission resonance coil of the noncontact power feed apparatus;
• relaying and transmitting the alternate-current power received from the noncontact power feed apparatus via the reception and transmission resonance coil;
• and
• moving the noncontact relay apparatus by using the alternate-current power received from the noncontact power feed apparatus.