| 摘要 |
PROBLEM TO BE SOLVED: To provide a contactless power-transmission system that allows optimizing impedance matching and reducing degradation of transmission efficiency.SOLUTION: A contactless power-transmission system includes: a capacitor 8(11) that is connected in parallel to at least one of a power-feeding-side coil 7 and a power-receiving-side coil 9 to constitute a resonant circuit and has a variable capacitance value; distance measurement means 13 for measuring an inter-coil distance d between the power-feeding-side coil 7 and the power-receiving-side coil 9; and adjustment means 14(16) for adjusting the capacitance value of the capacitor 8(11) according to the inter-coil distance d measured by the distance measurement means 13. The adjustment means 14(16) adjusts the capacitance value of the capacitor 8(11) so that the power-feeding-side coil 7 and the power-receiving-side coil 9 are critically coupled to each other at all times. |
