FOREIGN OBJECT DETECTION IN A WIRELESS POWER TRANSFER SYSTEM
First Claim
1. A wireless power transfer system comprising:
- a transmitter that includes a transmitting coil, a first detection coil, and a second detection coil, wherein;
the transmitting coil is configured to receive and wirelessly radiate power from a power supply to a receiver of a vehicle;
the first detection coil is configured to generate a first voltage in response to the radiated power from the transmitting coil; and
the second detection coil is configured to generate a second voltage in response to the radiated power from the transmitting coil; and
a comparison system electrically coupled to the transmitter,wherein the comparison system is configured to declare presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value,wherein the comparison system is configured to declare the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value, andwherein the transmitter is selectively disabled in response to presence of the foreign object being declared.
1 Assignment
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Accused Products
Abstract
A wireless power transfer system includes a transmitter with a transmitting coil, a first detection coil, and a second detection coil. The transmitting coil receives and wirelessly radiates power from a power supply to a receiver of a vehicle. In response to the radiated power from the transmitting coil, the first detection coil generates a first voltage, and the second detection coil generates a second voltage. A comparison system is electrically coupled to the transmitter. The comparison system declares presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value. The comparison system declares the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value. The transmitter is selectively disabled in response to presence of the foreign object being declared.
13 Citations
20 Claims
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1. A wireless power transfer system comprising:
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a transmitter that includes a transmitting coil, a first detection coil, and a second detection coil, wherein; the transmitting coil is configured to receive and wirelessly radiate power from a power supply to a receiver of a vehicle; the first detection coil is configured to generate a first voltage in response to the radiated power from the transmitting coil; and the second detection coil is configured to generate a second voltage in response to the radiated power from the transmitting coil; and a comparison system electrically coupled to the transmitter, wherein the comparison system is configured to declare presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value, wherein the comparison system is configured to declare the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value, and wherein the transmitter is selectively disabled in response to presence of the foreign object being declared. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless power transfer method comprising:
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receiving and wirelessly radiating power, with a transmitting coil of a transmitter, from a power supply to a receiver of a vehicle; generating, with a first detection coil of the transmitter, a first voltage in response to the radiated power from the transmitting coil; generating, with a second detection coil of the transmitter, a second voltage in response to the radiated power from the transmitting coil; declaring, with a comparison system electrically coupled to the transmitter, presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value; declaring, with the comparison system, the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value; and disabling the transmitter in response to presence of the foreign object being declared. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification