A Small-Size Foreign Metal Objects Detection Based on Rectangular-Coil Array for DWPT Systems

This article proposes a new detection method for foreign metal objects (FMOs) based on a new detection array. Compared with traditional FMO detection (FMOD), the proposed method can detect smaller FMOs without any external sensors. The nature of the method is to decouple the receiving (Rx) coil that has similar feedback characteristics to small-size FMOs. Hence, the cost of FMOD system is reduced in the actual implementation. Furthermore, this kind of FMOD does not require communication. So, it has high stability and can be easily realized. Finally, the experimental results prove that the proposed method has a high effectiveness for detecting small-size FMOs (able to detect FMOs up to 1.08 cm2).