Foreign matter detection device of wireless charging system

Abstract

The invention discloses a foreign matter detection device of a wireless charging system, which is divided into a transmitting side detector and a receiving side detector, the transmitting side detector is arranged at the transmitting end of the wireless charging system, and the receiving side detector is arranged at the receiving side of the wireless charging system; the transmitting side detectorcomprises a first antenna set, a selector switch and an excitation circuit which are connected. The first antenna set comprises a plurality of first antennas, and the selector switch selectively connects at least one first antenna with the excitation circuit to enable the at least one first antenna to serve as a transmitting antenna; the receiving side detector comprises a second antenna set, a second signal processing circuit and a second controller which are connected; the second antenna set is provided with at least one second antenna, and the second antenna is used for receiving signals transmitted by the transmitting antenna. Foreign matter detection is achieved through the transmitting side detector and the receiving side detector, foreign matter detection is achieved through the antennas of the detectors on the two sides, and danger caused by foreign matter entering in the charging process is avoided.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to a foreign object detection device of a wireless charging system. Background technique [0002] During the wireless charging process, if there is a metal foreign object on the power transmitting coil, the temperature will rise sharply due to the eddy current effect generated by the magnetic field on the metal foreign object, and there may even be a danger of fire. At present, there are many designs, such as adding detection coils such as balance coils, and detecting foreign objects by measuring changes in parameters such as the impedance of the detection coils. Existing methods can detect foreign objects attached to the surface of the transmitting coil, but for foreign objects in the space Bottles with metal caps, objects wrapped with metal objects, etc. cannot be detected by the above method, which is still a hidden danger in wireless charging, especially high-power wireless char...

AI Technical Summary

Problems solved by technology

However, there will be a possibility that if the organism enters the power transmission area after the charging system is shut down, the wireless charging system may not be able to detect the entry of the organism and resume power transmission. In this case, there will still be damage to the health of the organism. possible

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