Antenna alignment and vehicle guidance for wireless charging of electric vehicles
First Claim
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1. An apparatus for receiving wireless power, the apparatus comprising:
- a sensor coupled to a wireless power receive antenna, the wireless power receive antenna including a wireless power receive induction coil, the sensor collocated with the wireless power receive antenna, the sensor comprising;
a core;
a first coil wound about the core, the first coil located in a first plane;
a second coil wound about the core, the second coil located in a second plane that is different than the first plane and intersects the first plane; and
a third coil wound about the core, the third coil located in a third plane that is different than the first and second planes and intersects the first and second planes, the sensor configured to determine at least two vector components of a first electromagnetic field at a particular point based on respective signals from each of the first coil, the second coil, and the third coil, each vector component comprising a magnitude and direction;
a processor configured to determine, based on the at least two vector components, a direction of a source of the first electromagnetic field with respect to the sensor and a distance to the source of the first electromagnetic field from the sensor; and
a power conversion circuit configured to receive power from at least one of the first coil, the second coil, and the third coil to power a load.
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Abstract
Embodiments are directed to a wireless power antenna alignment systems and methods for electric vehicles. A system may include a sensor configured to detect the strength of an electromagnetic field in multiple dimensions and a processor configured to determine at least one of a direction and a position of a transmitted beacon signal based on an output of the sensor.
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Citations
23 Claims
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1. An apparatus for receiving wireless power, the apparatus comprising:
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a sensor coupled to a wireless power receive antenna, the wireless power receive antenna including a wireless power receive induction coil, the sensor collocated with the wireless power receive antenna, the sensor comprising; a core; a first coil wound about the core, the first coil located in a first plane; a second coil wound about the core, the second coil located in a second plane that is different than the first plane and intersects the first plane; and a third coil wound about the core, the third coil located in a third plane that is different than the first and second planes and intersects the first and second planes, the sensor configured to determine at least two vector components of a first electromagnetic field at a particular point based on respective signals from each of the first coil, the second coil, and the third coil, each vector component comprising a magnitude and direction; a processor configured to determine, based on the at least two vector components, a direction of a source of the first electromagnetic field with respect to the sensor and a distance to the source of the first electromagnetic field from the sensor; and a power conversion circuit configured to receive power from at least one of the first coil, the second coil, and the third coil to power a load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for receiving power via a first electromagnetic field at a position, the method comprising:
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sensing a first signal indicative of a strength of the first electromagnetic field, the first signal corresponding to a first plane of the first electromagnetic field at the position; sensing a second signal indicative of a strength of the first electromagnetic field, the second signal corresponding to a second plane of the first electromagnetic field at the position, the second plane being different than the first plane and intersecting the first plane; sensing a third signal indicative of a strength of the first electromagnetic field, the third signal corresponding to a third plane of the first electromagnetic field at the position, the third plane being different than the first plane and the second plane and intersecting the first plane and the second plane; determining at least two vector components of a first electromagnetic field at a particular point based on the first signal, the second signal, and the third signal, each vector component comprising a magnitude and direction; determining, based on the at least two vector components, a direction of the source of the first electromagnetic field with respect to a sensor and a distance to a source of the first electromagnetic field from the sensor, the sensor coupled to and collocated with a wireless power receive antenna; and receiving a power signal associated with at least one of the first signal, the second signal, and the third signal to power a load. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus for receiving power via a first electromagnetic field at a position, the apparatus comprising:
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means for sensing a first signal indicative of a strength of the first electromagnetic field, the first signal corresponding to a first plane of an electromagnetic field at the position; means for sensing a second signal indicative of a strength of the first electromagnetic field, the second signal corresponding to a second plane of the first electromagnetic field at the position, the second plane being different than the first plane; means for sensing a third signal indicative of a strength of the first electromagnetic field, the third signal corresponding to a third plane of the first electromagnetic field at the position, the third plane being different than the first plane and the second plane; means for determining at least two vector components, each component comprising a magnitude and direction, of a first electromagnetic field at the position based on the first signal, the second signal, and the third signal; means for determining, based on the at least two vector components, a direction of the source of electromagnetic field with respect to a sensor and a distance to the source of the first electromagnetic field from the sensor; and means for receiving power from at least one of the first signal, the second signal, and the third signal to power a load, the means for receiving power coupled to and collocated with the sensor. - View Dependent Claims (21, 22, 23)
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Specification