| 摘要 |
<p>Disclosed is a non-contact electric power transmission system optimizing an impedance matching and mitigating reduction of transmission efficiency. The non-contact electric power transmission system includes a power feeding unit (3) provided with a power feeding side coil (7) to which electric power is supplied, a power receiving unit (5) provided with a power receiving side coil (9) electromagnetically coupled with the power feeding side coil (7), and a capacitor (8, 11) connected in parallel with at least one of the power feeding side coil (7) and the power receiving side coil (9) so as to compose a resonance circuit, a capacity of which is varied such that a resonance frequency of the resonance circuit when the power feeding side coil (7) and the power receiving side coil (9) are critically coupled in a predetermined coil-to-coil distance between the power feeding side coil and the power receiving side coil, and a resonance frequency of the resonance circuit when the power feeding side coil and the power receiving side coil are over-coupled in a distance shorter than the coil-to-coil distance are conformed.</p> |
