Controlled inductance device and method
First Claim
1. An inductive device, comprising:
- a magnetically permeable core having a gap formed therein;
at least one winding disposed proximate to said core;
a U-shaped magnetically permeable element disposed at least partially within said gap, said U-shaped element being disposed so that a radius of said U-shape is oriented towards the center of said magnetically permeable core; and
an insulator disposed substantially inside of said U-shaped magnetically permeable element;
wherein said permeable element, core, and insulator cooperate to provide a desired inductance characteristic as a function of current.
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Accused Products
Abstract
Improved inductive apparatus having controlled core saturation which provides a desired inductance characteristic with low cost of manufacturing. In one embodiment, a pot core having a variable geometry gap is provided. The variable geometry gap allows for a “stepped” inductance profile with high inductance at low dc currents, and a lower inductance at higher dc currents, corresponding for example to the on-hook and off-hook states of a Caller ID function in a typical telecommunications line. In other embodiments, single- and multi-spool drum core devices are disclosed which use a controlled saturation element to allow for selectively controlled saturation of the core. Exemplary signal conditioning circuits (e.g., dynamically controlled low-capacitance DSL filters) using the aforementioned inductive devices are disclosed, as well as cost-efficient methods of manufacturing the inductive devices. An improved gapped toroid and an associated method of manufacturing is also disclosed.
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Citations
26 Claims
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1. An inductive device, comprising:
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a magnetically permeable core having a gap formed therein; at least one winding disposed proximate to said core; a U-shaped magnetically permeable element disposed at least partially within said gap, said U-shaped element being disposed so that a radius of said U-shape is oriented towards the center of said magnetically permeable core; and an insulator disposed substantially inside of said U-shaped magnetically permeable element; wherein said permeable element, core, and insulator cooperate to provide a desired inductance characteristic as a function of current. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An inductive device, comprising:
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a magnetically permeable toroidal core having a gap formed therein; at least one winding wound around at least a portion of said core; and means for magnetically bridging said gap, said means for bridging cooperating with said core and at least one winding to provide a desired inductance characteristic for said device by movably positioning said means within said gap.
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8. An inductive device adapted for use in a telecommunications circuit, said device having a controlled inductance characteristic, comprising:
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a magnetically permeable toroidal core having one gap formed therein at least one winding wound on said core; and at least one magnetically permeable element, said at least one magnetically permeable element comprising a permalloy comprising approximately 80-percent nickel adapted to bridge at least a portion of said gap; wherein said inductance characteristic comprises an inductance value associated with an “
on-hook”
current which is substantially larger than the inductance value associated with an “
off-hook”
current, said on-hook and off-hook inductance values being substantially constant as a function of their respective ones of said currents. - View Dependent Claims (9, 10)
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11. A controlled induction electronic device, comprising:
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a substantially toroidal core having a gap formed therein; at least one permeable element having first and second regions and being disposed substantially across said gap, said first and second region being in direct physical contact with respective portions of said core on either side of said gap; a coating covering substantially all of said core and said at least one element; and at least one winding disposed around said core and substantially atop said coating.
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12. An inductive device, comprising:
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a substantially toroidal core having a gap formed therein, said gap extending at least partly through the thickness of said core; a quantity of a first material, said first material adapted to change at least one physical property upon at least one application of a stimulus; a magnetically permeable element adapted to bridge at least a portion of said gap; and said first material, said permeable element, and said core are proximate one another in such fashion that when said stimulus is applied, said permeable element is brought into close cooperation with said core. - View Dependent Claims (13, 14)
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15. An inductive device, comprising:
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a substantially toroidal core having a gap formed therein, said gap extending at least partly through a thickness of said core; a quantity of responsive material, said material adapted to change at least one physical property upon at least one application of a stimulus; and a magnetically permeable element adapted to bridge at least a portion of said gap, wherein said permeable element and said core are proximate one another and substantially within a volume formed by said responsive material; wherein said responsive material, in response to said stimulus, forces said permeable material into communication with said core, thereby bridging said gap. - View Dependent Claims (16, 17)
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18. A controlled induction electronic device, comprising:
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a substantially toroidal core having a gap formed therein; a permeable gap-bridging element, wherein said element is disposed substantially across said gap; a first coating, said first coating substantially coating said core and said element; and a plurality of conductor turns on said core. - View Dependent Claims (19, 20)
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21. An inductive device having a controlled inductance, comprising:
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a magnetically permeable toroid core having a gap formed therein; at least one wind of conductive material wound around said core in a predetermined manner, said winding disposed at least thirty degrees from said gap; a thin sheet of magnetically permeable material, wherein said sheet of magnetically permeable material is folded at least once, said thin sheet when folded being wider and taller than the respective dimensions of said gap; and an insulating element adapted to be inserted between said folded sheet of said magnetically permeable material; wherein said folded sheet and at least one insulating element are at least partially inserted within said gap such that portions of said sheet physically contact said core. - View Dependent Claims (25, 26)
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22. A controlled inductive device, comprising:
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a magnetically permeable toroid core having a gap extending through at least a portion thereof, said gap having sidewalls associated therewith; a plurality of conductive turns around said core; an ultra-thin magnetically permeable element comprising a permalloy material having approximately 80-percent nickel at least partially within said gap of said toroid; and an insulating element, wherein said insulating element is disposed within said magnetically permeable element such that said permeable element physically contacts said core. - View Dependent Claims (23, 24)
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Specification