| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wireless power supply device capable of continuing power transmission even when power transmission efficiency reduces, while avoiding occurrence of a failure caused by reduction in the power transmission efficiency. <P>SOLUTION: A wireless power supply device 100 comprises: a power supply coil 111; a power supply part 120 for supplying AC power to the power supply coil; and control parts 150 and 160 which calculate power transmission efficiency from the power supply coil to a power reception coil 211, and control the power supply part on the basis of the power transmission efficiency. The control part controls the power supply part: so that power supply to the power supply coil is in a stopped state or intermittent supply state when the power transmission efficiency is lower than a first determination reference value; so that the power supply to the power supply coil is in a first power supply state when the power transmission efficiency is equal to of higher than the first determination reference value and lower than a second determination reference value; and so that the power supply to the power supply coil is in a second power supply state when the power transmission efficiency is equal to or higher than the second determination reference value. <P>COPYRIGHT: (C)2013,JPO&INPIT |
