Noncontact power feeding apparatus and noncontact power feeding method
As an aspect of the present invention, a noncontact power feeding apparatus includes: a power transmission resonator; and a power reception resonator configured to be magnetically coupled with the power transmission resonator by magnetic field resonance. The power transmission resonator is magnetically coupled with the power reception resonator by the magnetic field resonance, whereby electric power is supplied from an electric power source to the power reception resonator through the power transmission resonator. One of the power transmission resonator and the power reception resonator has a predetermined single resonant frequency, and the other one of the power transmission resonator and the power reception resonator has multiple resonant frequencies inclusive of the predetermined single resonant frequency.
1. A noncontact power feeding apparatus comprising:
a power transmission resonator; and
a power reception resonator configured to be magnetically coupled with the power transmission resonator by magnetic field resonance, wherein
the power transmission resonator is magnetically coupled with the power reception resonator by the magnetic field resonance, wherein electric power is supplied from an electric power source to the power reception resonator through the power transmission resonator,
a first resonator that is the power transmission resonator or the power reception resonator has a predetermined single resonant frequency,
a second resonator that differs from the first resonator and is the power transmission resonator or the power reception resonator includes a multi-resonance circuit having the predetermined single resonant frequency and a resonant frequency different from the predetermined single resonant frequency,
the multi-resonance circuit includes a plurality of LC resonant circuits each formed by connecting a coil and a capacitor in series, wherein the LC resonant circuits are connected together in parallel,
the resonant frequency that is different from the predetermined single resonant frequency is set within a range of a half width of the predetermined single resonant frequency, and
the multi-resonance circuit is configured such that the predetermined single resonant frequency does not vary.
2. The noncontact power feeding apparatus according to claim 1 , wherein the first resonator comprises a coil having an even winding pitch.
3. The noncontact power feeding apparatus according to claim 1 , wherein the second resonator comprises a coil having a varying winding pitch.
4. The noncontact power feeding apparatus according to claim 1 , wherein
the first resonator comprises as many resonant circuits as the second resonator, and
each of the resonant circuits of the power transmission resonator is located in the vicinity of a corresponding one of the resonant circuits of the power reception resonator.
5. The noncontact power feeding apparatus according to claim 1 , wherein
the first resonator is the power transmission resonator, and
the second resonator is the power reception resonator.
6. The noncontact power feeding apparatus according to claim 5 , comprising:
a plurality of power transmission resonators; and
a plurality of power reception resonators.
7. A noncontact power feeding method, comprising:
magnetically coupling a pair of resonators by magnetic field resonance, one of the pair of resonators having a predetermined single resonant frequency, the other one of the pair of resonators including a multi-resonance circuit having the predetermined single resonant frequency and a resonant frequency different from the predetermined single resonant frequency, and
supplying electric power from an electric power source to the other of the pair of resonators through the one of the pair of resonators,
wherein the multi-resonance circuit includes a plurality of LC resonant circuits each formed by connecting a coil and a capacitor in series, wherein the LC resonant circuits are connected together in parallel,
wherein the resonant frequency that is different from the predetermined single resonant frequency is set within a range of a half width of the predetermined single resonant frequency, and
wherein the multi-resonance circuit is configured such that the predetermined single resonant frequency does not vary.
8. A noncontact power feeding apparatus comprising:
power transmission resonating means; and
power reception resonating means for being magnetically coupled with the power transmission resonating means by magnetic field resonance, wherein
the power transmission resonating means is magnetically coupled with the power reception resonating means by the magnetic field resonance,
electric power is supplied from an electric power source to the power reception resonating means through the power transmission resonating means,
a first resonating means that is the power transmission resonating means or the power reception resonating means has a predetermined single resonant frequency,
a second resonating means that differs from the first resonating means and is the power transmission resonating means or the power reception resonating means includes a multi-resonance circuit having the predetermined single resonant frequency and a resonant frequency different from the predetermined single resonant frequency, and
the multi-resonance circuit includes a plurality of LC resonant circuits each formed by connecting a coil and a capacitor in series, wherein the LC resonant circuits are connected together in parallel,
the resonant frequency that is different from the predetermined single resonant frequency is set within a range of a half width of the predetermined single resonant frequency, and
the multi-resonance circuit is configured such that the predetermined single resonant frequency does not vary.