| 摘要 |
PROBLEM TO BE SOLVED: To provide a foreign matter detection device and method for a non-contact power supply device capable of reducing an induction voltage generated in a coil for foreign matter detection when there does not exist any conductive foreign matter, and therefore achieving the increase of the sensitivity of foreign matter detection for detecting the presence/absence of a conductive foreign matter and the reduction of erroneous detection.SOLUTION: The foreign matter detection device includes: a detection coil 12 positioned between a power transmission coil 3 and a power reception coil 4; and a detection unit 14 for detecting an induction voltage V generated in the detection coil 12, and for detecting the presence/absence of a conductive foreign matter 7 positioned between the power transmission coil 3 and the power reception coil 4 from this. The detection coil 12 is configured of one conductive wire 13 folded in a rectangular shape, and this conductive wire 13 is arranged such that magnetic fluxes in mutually opposite directions generated between the power transmission coil 3 and the power reception coil 4 are enclosed to include equal amounts, and that a reference voltage V0 generated when there does not exist the conductive foreign matter 7 becomes 0 or minimum. |
