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,a center part of the detection coil is positioned off a center axis of the power transmitting coil, and is positioned off a center axis of the power receiving coil, 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
6 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, a center part of the detection coil is positioned off a center axis of the power transmitting coil, and is positioned off a center axis of the power receiving coil, 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; positioning a center part of the detection coil off a center axis of the power transmitting coil and a center axis of the power receiving coil, and 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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Specification