| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless power transmission system that can accurately calculate a transmittable power value from a power transmission coil to a power-receiving coil without using a sensor and the like for detecting the position of the coils.SOLUTION: A wireless power transmission system S1 comprises a control circuit 30. The control circuit 30 connects an output of a rectifier circuit 22 to a load resistor 24 having a fixed resistance value, and then calculates a transmittable power value on the basis of an output voltage value of the rectifier circuit 22 and a transmittable power value corresponding to a pre-stored output voltage value with a power conversion circuit 11 being driven at a frequency higher than the maximum value of the resonant frequency maximizing the coupling coefficient between a power transmission coil L1 and a power-receiving coil L2 or a frequency lower than the minimum value of the resonant frequency. |
