METHOD AND SYSTEM FOR PERFORMING FOREIGN OBJECT DETECTION IN AN INDUCTIVE WIRELESS POWER TRANSFER SYSTEM

摘要

A method for performing foreign object detection in an inductive wireless power transfer system is disclosed. In the embodiment, the method involves obtaining measurements from a base station of a wireless power transfer system during charging and determining transmitter energy loss in a power transmitter, Ptxloss, using the obtained measurements, wherein the transmitter energy loss, Ptxloss, is a function of at least Vcap and PTx, wherein Vcap is proportional to the voltage amplitude across the capacitor of an LC tank circuit in a power transmitter and PTx is the total power supplied to the power transmitter. The method also involves detecting the presence of a foreign object in response to the estimated transmitter energy loss.

主权项

1. A method for performing foreign object detection in an inductive wireless power transfer system, the method comprising:
obtaining measurements from a base station of a wireless power transfer system during charging; determining transmitter energy loss in a power transmitter, Ptxloss, using the obtained measurements, wherein the transmitter energy loss, Ptxloss, is a function of at least Vcap and PTx, wherein Vcap is proportional to the voltage amplitude across the capacitor of an LC tank circuit in a power transmitter and PTx is a total power supplied to the power transmitter, and wherein Ptxloss is determined using a two-variable model defined by an equation a*Vcap2+b*PTx+c, wherein Vcap and PTx are the measurements obtained from the base station of the wireless power transfer system; and detecting the presence of a foreign object in response to the transmitter energy loss.