Foreign object detection in wireless energy transfer systems
First Claim
Patent Images
1. A wireless energy transfer system with foreign object debris detection, the system comprising:
- at least one wireless energy transfer source configured to generate an oscillating magnetic field;
at least one magnetic field sensor comprising at least two loops of conductive wire through which the oscillating magnetic field passes, wherein a first current induced in a first loop of the magnetic field sensor flows substantially in an opposite direction to a second current flowing in a second loop of the magnetic field sensor;
at least one readout circuit configured to measure an electrical parameter of the at least one magnetic field sensor to determine a presence of a metallic foreign object.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless energy transfer system includes a foreign object debris detection system. The system includes at least one wireless energy transfer source configured to generate an oscillating magnetic field. The foreign object debris may be detected by at least one field gradiometer positioned in the oscillating magnetic field. The voltage of the at least one field gradiometer may be measured using readout circuitry and a feedback loop based on the readings from the gradiometers may be used to control the parameters of the wireless energy source.
721 Citations
13 Claims
-
1. A wireless energy transfer system with foreign object debris detection, the system comprising:
-
at least one wireless energy transfer source configured to generate an oscillating magnetic field; at least one magnetic field sensor comprising at least two loops of conductive wire through which the oscillating magnetic field passes, wherein a first current induced in a first loop of the magnetic field sensor flows substantially in an opposite direction to a second current flowing in a second loop of the magnetic field sensor; at least one readout circuit configured to measure an electrical parameter of the at least one magnetic field sensor to determine a presence of a metallic foreign object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification