Stackable, passively-tunable, cost-reduced inductor
First Claim
1. A filter comprising:
- a ferrite core having a surface;
a first conductive winding defined by a first portion of the surface and wound in a clockwise direction, with ends of the first winding defined by the surface and serving to connect and to mount the filter to a circuit board;
a second conductive winding defined by a second portion of the surface and wound in a counter-clockwise direction, with ends of the second winding defined by the surface and serving to connect and to mount the filter to the circuit board; and
a plurality of conductive vias separate from the first and the second conductive windings, at least partly embedded in the ferrite core and opening onto the surface, for connecting to ends of windings of a second filter mounted on the ferrite core and for connecting the windings of the second filter to the circuit board.
17 Assignments
0 Petitions
Accused Products
Abstract
An inductor (100) optimized for surface-mount vacuum-pickup automated circuit assembly eliminates the expense of an inductor housing. The inductor has a hollow rectangular ferrite core (101) and a winding defined by a stripline (102) deposited on the core surface. Winding ends are formed by conductive vias (103) in the core that open onto the core surface, where they connect and mount the inductor to a circuit board (150). A flat sheet (104) adhered to one face of the core provides a surface for vacuum pickup and for labeling of the inductor. The core of a passively tuneable inductor (200) defines multiple unconnected winding segments (102-103). Segment ends mount the inductor to the circuit board and connect the segments to circuit board striplines (254) that are laid out in a pattern to interconnect a number of the segments into a winding. The inductor is tuned by changing the stripline layout and thereby varying the number of interconnected segments. The core of an electromagnetic interference choke (300) defines two windings wound axially in parallel and radially in opposite directions. The core of a choke (500) that permits stacked mounting defines additional conductive vias (503) for connecting the windings of a second choke (300) mounted on the core to the circuit board. For electromagnetic isolation, the windings of the two chokes are oriented orthogonally to each other.
18 Citations
16 Claims
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1. A filter comprising:
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a ferrite core having a surface; a first conductive winding defined by a first portion of the surface and wound in a clockwise direction, with ends of the first winding defined by the surface and serving to connect and to mount the filter to a circuit board; a second conductive winding defined by a second portion of the surface and wound in a counter-clockwise direction, with ends of the second winding defined by the surface and serving to connect and to mount the filter to the circuit board; and a plurality of conductive vias separate from the first and the second conductive windings, at least partly embedded in the ferrite core and opening onto the surface, for connecting to ends of windings of a second filter mounted on the ferrite core and for connecting the windings of the second filter to the circuit board. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An inductor comprising:
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a ferrite core having a surface; a conductive winding defined by the surface, with ends of the winding defined by the surface and serving to connect and to mount the inductor to a circuit board; and a plurality of conductive vias separate from the conductive winding, at least partly embedded in the ferrite core and opening onto the surface, for connecting to ends of a winding of a second inductor mounted on the ferrite core and for connecting the winding of the second inductor to the circuit board. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification