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US 7,623,014 B2Granted
Choke coil
AssigneeCyntec Co., Ltd.
InventorsRoger Hsieh, Yi-Min Huang, Lan-Chin Hsieh, Yung-Chien Wang
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Abstract
In one embodiment, a choke coil has a magnetic core, a coil, and magnetic material. The core has a first permeability which is from about 350 to 1200. The coil is wrapped around the core. The magnetic material surrounds the coil and has a second permeability. The first permeability is higher than the second permeability. The second permeability is from about 5 to 30.
Claims23
An optimized choke coil, comprising:
- a magnetic core having a first permeability which is from about 350 to about 1200, wherein:
- the magnetic core is a drum core comprising an upper core, a middle core, and a lower core;
- the upper core and the lower core have a same first width and a same first thickness;
- the middle core has a second width, wherein a ratio of the second width to the first width is from about 0.367 to about 0.667;
- and
- the middle core has a second thickness, wherein a ratio of the first thickness to the second thickness is from about 0.3 to about 0.667;
- a coil wrapped around said magnetic core;
- a magnetic material surrounding said coil and having a second permeability which is from about 5 to about 30;
- and
- an electrode portion connected to one end of said coil, wherein the choke coil has a saturation current greater than 160 mA.
7 more elements
An optimized choke coil, comprising:
- a magnetic core having a first permeability and comprising an upper core, a lower core, and a middle core located between the upper and lower cores, wherein:
- the first permeability is from about 350 to about 1200;
- the upper and lower cores have a similar shape of a first width and a first thickness;
- the middle core has a cylindrical shape of (i) a second width, smaller than the first width, and (ii) a second thickness, larger than the first thickness;
- a ratio of the second width to the first width is from about 0.367 to about 0.667;
- a ratio of the first thickness to the second thickness is from about 0.3 to about 0.667;
- and
- the upper, middle, and lower cores define a wiring space;
- a coil wrapped around the middle core within the wiring space;
- a magnetic material surrounding the coil and having a second permeability less than the first permeability, wherein the second permeability is from about 5 to about 30;
- and
- an electrode portion connected to one end of the coil and extending through the magnetic material, wherein the choke coil has a saturation current greater than 160 mA.
9 more elements
Dependencies are inferred from the claim text.