| CPC H02J 50/12 (2016.02) [B60L 53/39 (2019.02); H02J 50/40 (2016.02); H02J 50/90 (2016.02)] | 13 Claims |
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1. A wireless power transmission system which works to supply electric power wirelessly from a power transmitter to a power receiver, comprising:
a power transmitter which includes a primary resonant circuit and an alternating-current source, the primary resonant circuit including a primary coil and a primary capacitor for use in power transmission, the alternating-current source working to apply ac power at a given operating frequency to the primary resonant circuit;
a power receiver which includes a secondary resonant circuit, the secondary resonant circuit including a secondary coil and a secondary capacitor for use in a power reception, the secondary coil being to be magnetically coupled with the primary coil; and
a tertiary resonant circuit which includes a tertiary coil and a tertiary capacitor, the tertiary coil being arranged to achieve magnetic coupling with the primary coil and the secondary coil, the tertiary capacitor constituting a short-circuit resonant circuit along with the tertiary coil,
the primary coil has a self-inductance L1, a capacitance of the primary capacitor is set to a capacitance C1, as given by Eq. (1) below, to cause resonance in the primary capacitor and the primary coil at an angular frequency ω0 that is the operating frequency,
 the tertiary coil has a self-inductance L3, a capacitance of the tertiary capacitor is set to a capacitance C3, as given by Eq. (2) below, to cause resonance in the tertiary capacitor and the tertiary coil at the operating frequency,
 a capacitance of the secondary capacitor is determined to decrease a reactive component of the ac power which arises from the self-inductances and mutual inductances of the primary coil, the secondary coil, and the tertiary coil.
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