Patent ID: 9696358
Date: 2017-07-04
CPC Classifications: G01R,H02J

Claim:
1. A method for detecting a conducting non-receiver in an inductively coupled power transfer system, the system including a transmitter comprising: a. an inductor for generating an alternating magnetic field; b. a converter for supplying an alternating current to the inductor; and c. a sensor for measuring the current supplied to the converter, including the steps of: i. supplying current to the inductor so that it generates an alternating magnetic field of a first frequency that resonates with a receiver that may be present; ii. measuring a first current supplied to the converter; iii. supplying current to the inductor so that it generates an alternating magnetic field of a second frequency that still substantially resonates with a receiver that may be present; iii. measuring a second current supplied to the converter iv. comparing the change in inductor frequency to the change in measured current; and v. detecting a conducting non-receiver on the basis of the comparison.