FOREIGN MATTER DETECTION DEVICE AND METHOD FOR WIRELESS POWER SUPPLY DEVICE
First Claim
1. A foreign matter detection device for a wireless power supply device, comprising:
- a detection coil positioned between a power transmitting coil and a power receiving coil; and
a detection unit which detects an induced voltage generated in the detection coil and detects, from the detected induced voltage, presence or absence of a conductive foreign matter positioned between the power transmitting coil and the power receiving coil,wherein the detection coil comprises a continuous conductive wire in which two loop portions are wound in mutually opposite directions, andan area or a winding number of each of the loop portions or a direction connecting centroids of the two loop portions is set so that an induced voltage generated in the detection coil when a conductive foreign matter is not present becomes 0 or a minimum.
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Accused Products
Abstract
A foreign matter detection device including a detection coil between a power transmitting coil and a power receiving coil, and a detection unit detecting an induced voltage V generated in the detection coil and detects, from this induced voltage, presence or absence of a conductive foreign matter between the power transmitting coil and the power receiving coil. The detection coil includes a continuous conductive wire where two loop portions are wound in mutually opposite directions. An area or a winding number of each loop portion or a direction connecting centroids of the two loop portions is set so that the induced voltage (i.e., a reference voltage) generated in the detection coil when no conductive foreign matters exist becomes 0 or a minimum.
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Citations
11 Claims
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1. A foreign matter detection device for a wireless power supply device, comprising:
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a detection coil positioned between a power transmitting coil and a power receiving coil; and a detection unit which detects an induced voltage generated in the detection coil and detects, from the detected induced voltage, presence or absence of a conductive foreign matter positioned between the power transmitting coil and the power receiving coil, wherein the detection coil comprises a continuous conductive wire in which two loop portions are wound in mutually opposite directions, and an area or a winding number of each of the loop portions or a direction connecting centroids of the two loop portions is set so that an induced voltage generated in the detection coil when a conductive foreign matter is not present becomes 0 or a minimum. - View Dependent Claims (2, 3, 4)
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5. A foreign matter detecting method for a wireless power supply device, comprising:
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constituting a detection coil positioned between a power transmitting coil and a power receiving coil, by a continuous conductive wire in which two loop portions are wound in mutually opposite directions; setting an area or a winding number of each loop portion or a direction connecting centroids of the two loop portions so that an induced voltage generated in the detection coil when a conductive foreign matter is not present between the power transmitting coil and the power receiving coil becomes 0 or a minimum; and detecting an induced voltage generated in the detection coil and detecting, from the detected induced voltage, presence or absence of a conductive foreign matter positioned between the power transmitting coil and the power receiving coil. - View Dependent Claims (6)
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7. A foreign matter detection device for a wireless power supply device, comprising:
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a detection coil positioned between a power transmitting coil and a power receiving coil; and a detection unit which detects an induced voltage generated in the detection coil and detecting, from the detected induced voltage, presence or absence of a conductive foreign matter positioned between the power transmitting coil and the power receiving coil, wherein the detection coil comprises one conductive wire bent into a rectangular shape, and the conductive wire surrounds magnetic fluxes generated in mutually opposite directions between the power transmitting coil and the power receiving coil to contain equal amounts of the magnetic fluxes, and is disposed so that an induced voltage generated when a conductive foreign matter is not present becomes 0 or a minimum. - View Dependent Claims (8, 9)
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10. A foreign matter detecting method for a wireless power supply device, comprising:
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constituting a detection coil positioned between a power transmitting coil and a power receiving coil, by one continuous conductive wire bent into a rectangular shape; disposing the conductive wire so that the conductive wire surrounds magnetic fluxes generated in mutually opposite directions between the power transmitting coil and the power receiving coil to contain equal amounts of the magnetic fluxes, and so that an induced voltage generated in the detection coil when a conductive foreign matter is not present becomes 0 or a minimum; and detecting an induced voltage generated in the detection coil and detecting, from the detected induced voltage, presence or absence of the conductive foreign matter positioned between the power transmitting coil and the power receiving coil. - View Dependent Claims (11)
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Specification