Foreign object detection is an important issue that restricts the development of wireless charging for electric vehicles. When foreign matter enters the charging area during charging, the impedance of the charging coil changes. According to this principle, the result shows that the higher the coil excitation frequency, the more obvious the coil impedance changes. In order to carry out accurate foreign object detection while charging, this paper proposes a dual-frequency inductive charging method. The high frequency is used for foreign object detection, the low frequency is used for wireless charging, the power supply topology and design method are given, and the simulation is verified.
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