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; and
at least one substantially planar magnetically permeable element disposed proximate said gap;
wherein said at least one permeable element and core 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. Various embodiments of improved gapped toroid devices and an associated methods of manufacturing are also disclosed.
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Citations
31 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; and
at least one substantially planar magnetically permeable element disposed proximate said gap;
wherein said at least one permeable element and core cooperate to provide a desired inductance characteristic as a function of current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of manufacturing a controlled inductance device, comprising:
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providing a magnetically permeable toroid core having a gap extending through at least a portion thereof, disposing a magnetically permeable element proximate said gap and said core; and
winding a plurality of conductive turns around said core and said element. - View Dependent Claims (17, 18, 19, 20)
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21. 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 magnetically permeable element adapted to magnetically bridge at least a portion of said gap; and
at least one winding wound onto said core and said at least one permeable element wherein said inductance characteristic comprises an inductance value associated with an “
on-hook”
current is substantially larger than the inductance value associated with an “
off-hook”
current. - View Dependent Claims (22, 23)
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24. A telecommunications device having:
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a first port for interfacing with an outside telephone line;
a second port for transferring first signals between said first port and a first user device;
a third port for transferring second signals between said first port and a second user device; and
a filter circuit, said filter circuit being adapted to selectively block said first signals from being transferred to said second port, said filter circuit comprising at least one toroidal core device having an inductance characteristic determined at least in part by the thickness of a magnetically permeable element disposed proximate to said at least one toroidal core. wherein said inductance characteristic comprises an inductance value associated with an “
on-hook”
current is substantially larger than the inductance value associated with an “
off-hook”
current.
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25. 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; and
at least one magnetically permeable element disposed proximate said gap;
wherein said at least one permeable element and core cooperate to provide a desired inductance characteristic as a function of current, said inductance characteristic including a rate at which said at least one element saturates which is related at least in part to the thickness of said at least one element.
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26. A low cost inductive device, comprising:
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a magnetically permeable and substantially donut-shaped core having a gap formed therein;
at least one substantially planar washer disposed proximate said gap and mated to at least one face of said core using a bonding agent, said at least one washer being magnetically permeable and having a selected thickness, said selected thickness which at least in part determines the saturation rate during changes in current between on-hook and off-hook states; and
wherein said at least one permeable element and core cooperate to provide a desired inductance characteristic as a function of said current.
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27. An inductive device, comprising:
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a magnetically permeable core having a gap formed therein, said core having a cross-section which is at least partly rounded in its periphery proximate to at least a first side of said core;
at least one magnetically permeable element disposed proximate said first face and said gap, said element having an inner surface having at least one curved region adapted to cooperate substantially with said at least partly rounded periphery of said core to provide aclose coupling there between; and
a plurality of winding turns wound around at least a portion of said core and said element;
wherein said at least one permeable element and core cooperate to provide a desired inductance characteristic as a function of current.
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28. An inductive device, comprising:
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a magnetically permeable core comprising first and second substantially separate core portions; and
at least one magnetically permeable element disposed at least partly between said first and second core portions;
wherein said at least one permeable element and core cooperate to provide a desired inductance characteristic as a function of current. - View Dependent Claims (29, 30, 31)
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Specification