Systems, methods, and apparatus for detection of metal objects in a predetermined space
First Claim
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1. An apparatus for detecting a presence of an object in a magnetic field, the apparatus comprising:
- a power circuit configured to generate the magnetic field and transfer power wirelessly at a first level sufficient to power or charge a load via the magnetic field; and
a detection circuit configured to transmit signals,detect, based on a reflection of the transmitted signals, a frequency of vibration of the object caused by the magnetic field,determine a positive detection of the presence of the object based on the frequency of vibration, andconfirm the positive detection based on a magnetic pulse generated at a second level by the power circuit in response to the positive detection, the second level being stronger than the first level.
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Abstract
This disclosure provides systems, methods and apparatus for detecting foreign objects. In one aspect an apparatus for detecting a presence of an object in a magnetic field is provided. The apparatus includes a power circuit configured to generate the magnetic field and transfer power wirelessly at a level sufficient to power or charge a load via the magnetic field. The apparatus further includes a detection circuit configured to transmit signals and detect, based on a reflection of the transmitted signals, a frequency of vibration of the object caused by the magnetic field.
46 Citations
27 Claims
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1. An apparatus for detecting a presence of an object in a magnetic field, the apparatus comprising:
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a power circuit configured to generate the magnetic field and transfer power wirelessly at a first level sufficient to power or charge a load via the magnetic field; and a detection circuit configured to transmit signals, detect, based on a reflection of the transmitted signals, a frequency of vibration of the object caused by the magnetic field, determine a positive detection of the presence of the object based on the frequency of vibration, and confirm the positive detection based on a magnetic pulse generated at a second level by the power circuit in response to the positive detection, the second level being stronger than the first level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 27)
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11. A method for detecting a presence of an object in a magnetic field, the method comprising:
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generating the magnetic field; transferring power wirelessly at a first level sufficient to power or charge a load via the magnetic field, the magnetic field causing a vibration of the object; transmitting signals; detecting, based on a reflection of the transmitted signals, a frequency of the vibration of the object caused by the magnetic field; determining a positive detection of the presence of the object based on the frequency of vibration; and confirming the positive detection based on a magnetic pulse generated at a second level in response to the positive detection, the second level being stronger than the first level. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for detecting a presence of an object in a magnetic field, the apparatus comprising:
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means for generating the magnetic field; means for transferring power wirelessly at a first level sufficient to power or charge a load via the magnetic field; means for transmitting signals; means for detecting, based on a reflection of the transmitted signals, a frequency of vibration of the object caused by the magnetic field; means for determining a positive detection of the presence of the object based on the frequency of vibration; and means for confirming the positive detection based on a magnetic pulse generated at a second level by the means for generating in response to the positive detection, the second level being stronger than the first level. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification