POWER SUPPLY DEVICE, POWER RECEPTION DEVICE, AND POWER SUPPLY/RECEPTION DEVICE
First Claim
Patent Images
1. A power supply device that supplies power to a power reception device comprising a power reception coil using electromagnetic induction, the power supply device comprising:
- a power supply coil in which “
m”
(where m≧
2) planar coils are formed by winding respective wire materials around a point on plane radially outward such that the “
m”
planar coils are provided in opposing relation to a space in which the power reception coil is arranged; and
a driving circuit that feeds alternating currents having a common frequency to the “
m”
planar coils, respectively, during power supply to the power reception device,wherein a static magnetic field that is generated in the space when a direct current is fed to a (k−
1)th and a kth (where 2≦
k≦
m) planar coil of the power supply coil from the inner side is stronger at a position corresponding to an inner circumference of the kth planar coil than on either side relative to the position in a radial direction.
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Abstract
A power supply unit is a power supply device that supplies power to a power reception device using electromagnetic induction. The power supply unit has a power supply coil in which planar coils that are formed by winding respective wire materials around the same point in the same plane are arranged from an inner side to an outer side in the radial direction. The power supply unit supplies alternating currents having a common frequency to respective planar coils, thereby generating a magnetic field for supplying power using electromagnetic induction in the space in which the power reception coil is arranged. A static magnetic field that is generated in the arrangement space in the case where a direct current is fed to planar coils is stronger at a position corresponding to an inner circumference of planar coil.
23 Citations
14 Claims
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1. A power supply device that supplies power to a power reception device comprising a power reception coil using electromagnetic induction, the power supply device comprising:
-
a power supply coil in which “
m”
(where m≧
2) planar coils are formed by winding respective wire materials around a point on plane radially outward such that the “
m”
planar coils are provided in opposing relation to a space in which the power reception coil is arranged; anda driving circuit that feeds alternating currents having a common frequency to the “
m”
planar coils, respectively, during power supply to the power reception device,wherein a static magnetic field that is generated in the space when a direct current is fed to a (k−
1)th and a kth (where 2≦
k≦
m) planar coil of the power supply coil from the inner side is stronger at a position corresponding to an inner circumference of the kth planar coil than on either side relative to the position in a radial direction. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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2. A power supply device that supplies power to a power reception device comprising a power reception coil that utilizes electromagnetic induction, the power supply device comprising:
-
a power supply coil in which “
m”
(where m≧
2) planar coils that are formed by winding respective wire materials around a point on a plane radially outward such that “
m”
planar coils are provided in opposing relation to a space in which the power reception coil is arranged; anda driving circuit that feeds alternating currents having a common frequency to the “
m”
planar coils, respectively, during power supply to the power reception device,wherein a difference in length between the wire materials of a (k−
1)th and a kth (where 2≦
k≦
m) planar coil of the power supply coil from the inner side is less than a length of an outer circumference of the kth planar coil.
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12. A power supply/reception device comprising a power supply device that supplies power by electromagnetic induction and a power reception device that receives power from the power supply device,
wherein the power supply device comprises: -
a power supply coil in which “
m”
(where m≧
2) planar coils that are formed by winding respective wire materials around a point on a plane radially outward such that the “
m”
planar coils are provided in opposing relation to a space in which the power reception coil is arranged; anda driving circuit feeds alternating currents having a common frequency to the “
m”
planar coils, respectively, during power supply to the power reception device, anda static magnetic field generated in the space when a direct current is fed to a (k−
1)th and a kth (where 2≦
k≦
m) planar coil of the power supply coil from the inner side is stronger at a position corresponding to an inner circumference of the kth planar coil than on either side relative to the position in a radial direction. - View Dependent Claims (14)
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13. A power supply/reception device comprising a power supply device that supplies power by electromagnetic induction and a power reception device that receives power from the power supply device,
wherein the power supply device comprises: -
a power supply coil in which “
m”
(where m≧
2) planar coils are formed by winding respective wire materials around a point on a plane radially outward, the “
m”
planar coils opposing a space in which the power reception coil is arranged; anda driving circuit that feeds alternating currents having a common frequency to the “
m”
planar coils, respectively, during power supply to the power reception device, anda difference in length between the wire materials of a (k−
1)th and a kth (where 2≦
k≦
m) planar coil of the power supply coil from the inner side is less than a length of an outer circumference of the kth planar coil.
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Specification
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- Resources
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Current AssigneeLequio Power Technology Corp.
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Original AssigneeLequio Power Technology Corp.
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InventorsAkiya, Tomomi
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Application NumberUS14/373,477Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current307/104CPC Class CodesH01F 27/2871 Pancake coilsH01F 38/14 Inductive couplings for wir...H02J 50/005 Mechanical details of housi...H02J 50/10 using inductive couplingH02J 50/12 of the resonant typeH02J 50/402 the two or more transmittin...H02J 50/70 involving the reduction of ...H02J 50/80 involving the exchange of d...
