Metallic foreign object detection device , judgement device and wireless charging system

The utility model discloses a metallic foreign object detection device, metallic foreign object detection device includes first direction coparallel and align to grid's a m detecting coil and second orientation coparallel and align to grid's a n detecting coil, detecting coil and the stack of the ascending detecting coil in second side on the first direction, the detecting coil comprises a k coil section, follows the one end of detecting coil begins, and two liang of coil section are a set of, and each coil section of containing of group is inequality, and two coil section's of every inter block area equals, around to on the contrary, will when each coil section of detecting coil arranges magnetic field in, the voltage of detecting coil or electric current are in predetermined value range. The utility model discloses it judges device and wireless charging system still to disclose a metallic foreign object. The utility model provides the sensitivity that high wireless charging system detected metallic foreign