Foreign object detection in a wireless power transfer system
A wireless power transmitter (101) comprises a driver (201) generating a drive signal for a transmitter coil (103) thereby generating a power transfer signal during power transfer intervals of a repeating time frame comprising at least one power transfer interval and one foreign object detection int...
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| creator | Veltman, Eddy Gerrit Van Wageningen, Andries Ettes, Wilhelmus Gerardus Maria |
| description | A wireless power transmitter (101) comprises a driver (201) generating a drive signal for a transmitter coil (103) thereby generating a power transfer signal during power transfer intervals of a repeating time frame comprising at least one power transfer interval and one foreign object detection interval. A test generator (211) generates a test drive signal for a test coil (209) thereby generating an electromagnetic test signal during foreign object 5 detection intervals. A foreign object detector (207) performs a foreign object detection test in response to a measured parameter for the test drive signal during the foreign object detection intervals. An adapter (213) generates a varying test drive signal for the test coil (209) during an adaptation interval, and determines a test drive signal parameter value in response to the varying test drive signal. The test generator (211) sets a signal property of the test drive 10 signal during at least one foreign object detection interval in response to the test drive signal parameter value. |
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| subjects | CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY |
| title | Foreign object detection in a wireless power transfer system |
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