| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-contact power transmission device capable of preventing deteriorated energy transmission efficiency due to the change of a resonance frequency caused by a gap distance change and/or position deviation between coils, without causing a large size and a cost increase of the device.SOLUTION: Non-contact power transmission is performed between a power transmission coil 11 and a power reception coil 31 by electromagnetic resonance coupling. A detection coil 13 is attached in the vicinity of the power transmission coil 11. By the detection output of the detection coil 13, a resonance state is detected. According to the detection output of the detection coil 13, a frequency set unit 18 controls the frequency of a power source supplied to the power transmission coil 11. |
