Power receiving device, and electronic apparatus and non-contact charging system using the same
First Claim
Patent Images
1. A power receiving device, comprising:
- a power receiving coil having a spiral coil;
a rectifier rectifying an alternating voltage generated in the power receiving coil;
a secondary battery to which a direct current voltage rectified in the rectifier is charged; and
a magnetic foil arranged in at least one of a position between the spiral coil and the secondary battery, and a position between the spiral coil and the rectifier,wherein the magnetic foil comprises a body of a plurality of stacked magnetic alloy ribbons comprising an amorphous alloy or an iron-based microcrystal alloy, and each magnetic alloy ribbon has an average thickness in a range of 5 to 25 μ
m,wherein the magnetic foil has a μ
r′
·
t value in a range of 30000 or more and 1320000 or less, where the μ
r′
is a real component of relative permeability of the magnetic foil, t [μ
m] is a plate thickness of the magnetic foil which is a total thickness of the plurality of the stacked magnetic alloy ribbons, and the μ
r′
·
t value is a product of the real component μ
r′
of the relative permeability and the plate thickness t, andwherein a power receiving rate of the power receiving coil is 0.25 W/h or higher.
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Accused Products
Abstract
An electronic apparatus (1) includes a power receiving device (2) and an electronic apparatus main body (3). The power receiving device (2) includes a power receiving coil (11) having a spiral coil, a rectifier (12), and a secondary battery (13). The electronic apparatus main body (3) includes an electronic device (14) and a circuit board (15). A magnetic foil (16) is arranged in at least one position between the spiral coil (11) and the secondary battery (13), the rectifier (12), the electronic device (14), or the circuit board (15). The magnetic foil (16) has a μr′·t value expressed as the product of the real component μr′ of relative permeability and the plate thickness t of 30000 or larger.
48 Citations
17 Claims
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1. A power receiving device, comprising:
-
a power receiving coil having a spiral coil; a rectifier rectifying an alternating voltage generated in the power receiving coil; a secondary battery to which a direct current voltage rectified in the rectifier is charged; and a magnetic foil arranged in at least one of a position between the spiral coil and the secondary battery, and a position between the spiral coil and the rectifier, wherein the magnetic foil comprises a body of a plurality of stacked magnetic alloy ribbons comprising an amorphous alloy or an iron-based microcrystal alloy, and each magnetic alloy ribbon has an average thickness in a range of 5 to 25 μ
m,wherein the magnetic foil has a μ
r′
·
t value in a range of 30000 or more and 1320000 or less, where the μ
r′
is a real component of relative permeability of the magnetic foil, t [μ
m] is a plate thickness of the magnetic foil which is a total thickness of the plurality of the stacked magnetic alloy ribbons, and the μ
r′
·
t value is a product of the real component μ
r′
of the relative permeability and the plate thickness t, andwherein a power receiving rate of the power receiving coil is 0.25 W/h or higher. - View Dependent Claims (2, 3, 4, 5, 6, 7, 16)
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8. An electronic apparatus, comprising:
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a power receiving device including a power receiving coil having a spiral coil, a rectifier rectifying an alternating voltage generated in the power receiving coil, and a secondary battery to which a direct current voltage rectified in the rectifier is charged; an electronic apparatus main body including an electronic device supplied with the direct current voltage from the secondary battery for operation, and a circuit board on which the electronic device is mounted; and a magnetic foil arranged in at least one of a position between the spiral coil and the secondary battery, a position between the spiral coil and the rectifier, a position between the spiral coil and the electronic device, and a position between the spiral coil and the circuit board, wherein the magnetic foil comprises a body of a plurality of stacked magnetic alloy ribbons comprising an amorphous alloy or an iron-based microcrystal alloy, and each magnetic alloy ribbon has an average thickness in a range of 5 to 25 μ
m,wherein the magnetic foil has a μ
r′
·
t value in a range of 30000 or more and 1320000 or less, where the μ
r′
is a real component of relative permeability of the magnetic foil, t [μ
m] is a plate thickness of the magnetic foil which is a total thickness of the plurality of the stacked magnetic alloy ribbons, and the μ
r′
·
t value is a product of the real component μ
r′
of the relative permeability and the plate thickness t, andwherein a power receiving rate of the power receiving coil is 0.25 W/h or higher. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 17)
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Specification
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Current AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
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InventorsInoue, Tetsuo, Kusaka, Takao
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Primary Examiner(s)RAMADAN, RAMY O
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Application NumberUS12/294,401Publication NumberTime in Patent Office1,958 DaysField of Search320/108US Class Current320/108CPC Class CodesH01F 3/00 Cores, Yokes, or armatures ...H01F 38/14 Inductive couplings for wir...H01M 10/052 Li-accumulatorsH01M 10/425 Structural combination with...H01M 10/46 Accumulators structurally c...H02J 50/10 using inductive couplingH02J 7/00302 Overcharge protectionY02E 60/10 Energy storage using batteries
