US4199744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic core with magnetic ribbon in gap thereof
Assignee: FERY ELECTRONICS Inc
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Filing: 1979-01-02
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Granted: 1980-04-22
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Expires: 1999-01-02
Abstract
Abstract A ferrite toroid has two radially extending gaps. Into each gap there is inserted an insulative shim having a magnetic metal ribbon folded over the shim. When current is applied to a winding on the core, the resultant magnetic flux is steered into the magnetic ribbons and around the gaps. For high frequency excitations eddy current losses in the ribbons are high and the windings have low Q but high inductance. At high winding currents, the magnetic ribbons are saturated, the inductance is reduced and the Q of the winding increases. In a switching voltage regulator, this inductor tends to generate only a small amount of ringing and electromagnetic radiation noise.
Inventors
- 👤 Tomm V. Aldridge
- 👤 Richard M. Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
H; H01; H01F; H01F3/00; H01F3/10; H01F3/14; H01F17/00; H01F17/04; H01F17/06; H01F17/062; H01F27/00; H01F27/34; H01F27/348
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A magnetic core for use in a wound-core electrically-inductive component comprising an annular magnetic piece having at least one gap that extends at least part way through said piece; and a U-shaped magnetic metal ribbon in said gap with the two arms of said U-shaped ribbon being adjacent the two opposing faces of said gap, respectively.
Claim 2
Dependent Claim
56 words
A magnetic core for use in a wound-core electrically-inductive component comprising an annular magnetic piece having at least one gap that extends at least part way through said piece; and a U-shaped magnetic metal ribbon in said gap with the two arms of said U-shaped ribbon being adjacent the two opposing faces of said gap, respectively.
Claim 3
Dependent Claim
21 words
The core of claim 1 wherein said ribbon is formed in said U-shape by being folded about an insulative non-magnetic shim.
Claim 4
Dependent Claim
14 words
The core of claim 1 wherein said ribbon is selected from silicon-iron and nickel-iron.
Claim 5
Dependent Claim
12 words
The core of claim 1 wherein said annular magnetic piece is ferrite.
Claim 6
Dependent Claim
15 words
The core of claim 4 wherein the magnetic permeability of said ferrite is about 2700.
Claim 7
Dependent Claim
15 words
The core of claim 1 additionally comprising a wire coil being wound on said core.
Claim 8
Dependent Claim
18 words
The core of claim 1 wherein the permeability of said annular magnetic piece is no less than 100.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |