US 2022/0190650 A1 · APPARATUS AND METHOD FOR PERFORMING FOREIGN OBJECT DETECTION IN WIRELESS POWER TRANSFER SYSTEM

Abstract

Provided are an apparatus and method for performing foreign object detection in a wireless power transfer system. The present specification discloses a method comprising receiving a digital ping from the wireless power transmitter; transmitting an identification and configuration packets to the wireless power transmitter; transmitting a foreign object detection (FOD) state packet which indicates a reference Q factor of the wireless power receiver to the wireless power transmitter; and receiving wireless power through magnetic coupling from the wireless power transmitter based on the foreign object detection result of the wireless power transmitter using the reference Q factor. Irrespective of individual characteristics of a wireless power receiver, accuracy and reliability of detecting a foreign object may be improved.

Claims14

Dependent claims

A method for receiving wireless power from a wireless power transmitter by a wireless power receiver based on foreign object detection in a wireless power transfer system, the method comprising:

receiving a digital ping from the wireless power transmitter;
transmitting a configuration packet to the wireless power transmitter;
transmitting a foreign object detection status packet including a reference Q factor (Qref) of the wireless power receiver to the wireless power transmitter;
and
receiving wireless power from the wireless power transmitter based on a result of foreign object detection, wherein the foreign object detection is performed by the wireless power transmitter based on the reference Q factor,
wherein the reference Q factor is determined based on Q factors obtained at five positions, wherein the reference Q factor is larger than or equal to 25.

3 more elements

A method for transferring wireless power to a wireless power receiver by a wireless power transmitter based on foreign object detection in a wireless power transfer system, the method comprising:

transmitting a digital ping to the wireless power receiver;
receiving a configuration packet from the wireless power receiver;
receiving a foreign object detection status packet which informs a reference Q factor (Qref) of the wireless power receiver from the wireless power receiver;
performing foreign object detection based on the reference Q factor;
and
transferring wireless power to the wireless power receiver based on a result of the foreign object detection,
wherein the reference Q factor is determined based on Q factors obtained at five positions,
wherein the reference Q factor is larger than or equal to 25.

5 more elements

Dependencies are inferred from the claim text.

Apparatus and method for performing foreign object detection in wireless power transfer system

Life of this patent

Apparatus and method for performing foreign object detection in wireless power transfer system

Life of this patent

Abstract

Claims14