FOREIGN OBJECT DETECTION DEVICE, FOREIGN OBJECT DETECTION METHOD, AND NON-CONTACT CHARGING SYSTEM
First Claim
1. A foreign object detector comprising:
- a detection coil;
a transmitting circuit generating RF power of a predetermined frequency;
a directional coupler outputting the RF power supplied from the transmitting circuit to the detection coil, and extracting reflected power that is a power component reflected by the detection coil; and
a detection circuit receiving the reflected power extracted by the directional coupler, and detecting a foreign object by sensing a change in frequency characteristic of the reflected power.
2 Assignments
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Accused Products
Abstract
Disclosed herein is a foreign object detector to detect a foreign object while distinguishing metal from water. The foreign object detector includes a detection coil; a transmitting circuit generating RF power of a predetermined frequency; a directional coupler outputting the RF power supplied from the transmitting circuit to the detection coil, and extracting reflected power that is a power component reflected by the detection coil; and a detection circuit receiving the reflected power extracted by the directional coupler, and detecting the foreign object by sensing a change in the frequency characteristic of the reflected power.
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Citations
7 Claims
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1. A foreign object detector comprising:
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a detection coil; a transmitting circuit generating RF power of a predetermined frequency; a directional coupler outputting the RF power supplied from the transmitting circuit to the detection coil, and extracting reflected power that is a power component reflected by the detection coil; and a detection circuit receiving the reflected power extracted by the directional coupler, and detecting a foreign object by sensing a change in frequency characteristic of the reflected power. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting a foreign object, the method comprising:
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outputting RF power generated at a predetermined frequency to a detection coil; and detecting the foreign object by sensing a change in frequency characteristic of reflected power that is a power component reflected by the detection coil.
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Specification