ELECTRONIC DEVICE HAVING AN INDUCTIVE RECEIVER COIL WITH ULTRA-THIN SHIELDING LAYER AND METHOD
First Claim
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1. An electronic device (10,40) configured for being inductively powered or charged comprising:
- an inductive receiver coil (12) configured for generating current in response to being exposed to an alternating magnetic field generated substantially on a first side of the receiver coil, anda softmagnetic shielding layer (14) disposed on a second side of the receiver coil, opposite to the first side where the magnetic field is generated, configured (i) to shield the magnetic field from an overlying object (24,42) wherein the overlying object is (i)(a) subject to being undesirably influenced by the magnetic field, or (i)(b) subject to causing an undesirable influence on the magnetic field and (ii) to mitigate formation of eddy currents within the softmagnetic shielding layer and the overlying object.
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Abstract
An electronic device (10,40) which is inductively powered or charged has a receiver coil (12) on which a metal object (24,42) can be placed without causing deterioration of the coil'"'"'s magnetic field and without generating heat in the metal object. An ultra-thin, flexible, high magnetic permeability metal foil (14) having a thickness of 50 μm or less is provided as a shielding layer between the coil and the object. Radial slits (22) are provided in the shielding layer, which suppress unwanted eddy currents in the layer to reduce power transfer losses and heat generation.
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Citations
20 Claims
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1. An electronic device (10,40) configured for being inductively powered or charged comprising:
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an inductive receiver coil (12) configured for generating current in response to being exposed to an alternating magnetic field generated substantially on a first side of the receiver coil, and a softmagnetic shielding layer (14) disposed on a second side of the receiver coil, opposite to the first side where the magnetic field is generated, configured (i) to shield the magnetic field from an overlying object (24,42) wherein the overlying object is (i)(a) subject to being undesirably influenced by the magnetic field, or (i)(b) subject to causing an undesirable influence on the magnetic field and (ii) to mitigate formation of eddy currents within the softmagnetic shielding layer and the overlying object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic device (10,40) configured for being inductively powered or charged, comprising:
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an inductive receiver coil (12) configured for generating current in response to being exposed to an alternating magnetic field generated substantially on a first side of the inductive receiver coil; and an ultra-thin softmagnetic shielding layer (14) disposed on a second side of the inductive receiver coil, opposite to the first side where the magnetic field is generated, configured (i) to shield the magnetic field from an overlying object (24,42) wherein the overlying object is (i)(a) subject to being undesirably influenced by the magnetic field, or (i)(b) subject to causing an undesirable influence on the magnetic field and (ii) to mitigate formation of eddy currents within the shielding layer and the overlying object, wherein the shielding layer comprises a thickness less than or equal to one hundred micrometers (100 μ
m), wherein said shielding layer includes at least one eddy current mitigation feature (22) that comprises a number of slits formed within the shielding layer, wherein the slits are substantially parallel to magnetic flux lines and orthogonal to eddy current flow for imposing a large impedance to eddy current formation, and wherein the shielding layer comprises a material selected from the group consisting of Mumetal, nanocristaline metal and amorphous metals. - View Dependent Claims (15)
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16. A method for configuring an electronic device (10,40) for being inductively powered or charged, comprising:
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configuring an inductive receiver coil (12) for generating current in response to being exposed to an alternating magnetic field generated substantially on a first side of the inductive receiver coil; and disposing an ultra-thin softmagnetic shielding layer (14) on a second side of the inductive receiver coil, opposite to the first side where the magnetic field is generated, configured (i) to shield the magnetic field from an overlying object (24,42) wherein the overlying object is (i)(a) subject to being undesirably influenced by the magnetic field, or (i)(b) subject to causing an undesirable influence on the magnetic field and (ii) to mitigate formation of eddy currents within the shielding layer and the overlying object, wherein the shielding layer comprises a thickness less than or equal to one hundred micrometers (100 μ
m). - View Dependent Claims (17, 18, 19, 20)
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Specification