Patent ID: 11870275
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 17:
18. The method according to claim 17, wherein the determining, by the determining module based on the frequency-adjusted first signal and a pre-stored fourth signal, whether there is a metal foreign matter in an area of the target coil comprises:
when a difference between an amplitude of the fifth signal and an amplitude of the fourth signal is less than a second specified value, determining, by the determining module, that there is no metal foreign matter in the area of the target coil; or
when a difference between an amplitude of the fifth signal and an amplitude of the fourth signal is greater than or equal to the second specified value, determining, by the determining module, that there is a metal foreign matter in the area of the target coil.