US3611330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting impending saturation of magnetic cores
Assignee: National Aeronautics and Space Administration
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Filing: 1969-01-15
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Granted: 1971-10-05
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Expires: 1989-01-15
Abstract
Abstract This disclosure describes an apparatus for detecting impending saturation in magnetic cores. A saturable core, which may be toroidally formed, has an aperture in the circumference of the toroid. Windings are separately wound around the toroid between the aperture and the outer edge of the toroid and between the aperture and the inner edge of the toroid. The windings are serially connected in voltage-opposing relation. When saturation of the core starts to occur in one direction or the other, a voltage unbalance in the windings occurs. This unbalance causes a signal to occur which is detectable and indicates the start of saturation.
Inventors
- 👤 Ramon A Cacossa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:27
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53846; H03; H03K; H03K3/00; H03K3/02; H03K3/45; H03K3/51
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
Saturable core apparatus comprising: a saturable magnetic core having magnetic paths of different mean lengths, said magnetic core being toroidal in shape and having an aperture between said magnetic paths of different mean lengths with said aperture being in the circumference of said toroidal shaped core; a first means in the form of a first winding through said aperture for sensing the magnetic flux in a magnetic path of one mean length; second means in the form of a second winding through said aperture for sensing the magnetic flux in a magnetic path of a second mean length, said first and second windings being series connected in voltage opposition to generate a signal when one of said magnetic paths is saturated and the other magnetic path is not saturated; at least one primary winding wound around said toroidal core; and, a switch means connected to said first and second windings and to said at least one primary winding for preventing the application of power to said at least one primary winding when said first and second windings generate said signal.
Claim 2
Dependent Claim
180 words
Saturable core apparatus comprising: a saturable magnetic core having magnetic paths of different mean lengths, said magnetic core being toroidal in shape and having an aperture between said magnetic paths of different mean lengths with said aperture being in the circumference of said toroidal shaped core; a first means in the form of a first winding through said aperture for sensing the magnetic flux in a magnetic path of one mean length; second means in the form of a second winding through said aperture for sensing the magnetic flux in a magnetic path of a second mean length, said first and second windings being series connected in voltage opposition to generate a signal when one of said magnetic paths is saturated and the other magnetic path is not saturated; at least one primary winding wound around said toroidal core; and, a switch means connected to said first and second windings and to said at least one primary winding for preventing the application of power to said at least one primary winding when said first and second windings generate said signal.
Claim 3
Dependent Claim
44 words
Saturable core apparatus as claimed in claim 1, wherein: said at least one primary winding includes first and second windings wound around said magnetic core; and, said switch means includes first and second semiconductor switches selectively connected to said first and second primary windings.
Claim 4
Dependent Claim
134 words
Saturable core apparatus as claimed in claim 2 including: a DC voltage source having one terminal connected to the emitters of said first and second semiconductors and the other terminal connected to one end of each of said first and second primary windings, the other end of said first primary winding being connected to the collector of said first semiconductor and the other end of said second primary winding being connected to the collector of said second semiconductor; a comparator having one input adapted for connection to a reference source and a second input connected to said series connected first and second winding, the other end of said first and second windings being connected to ground; and, means for connecting the output of said comparator to the bases of said first and second semiconductors.
Claim 5
Dependent Claim
136 words
Saturable core apparatus as claimed in claim 3, wherein said means for connecting the output of said comparator to said first and second transistors comprises: an inverter having its input connected to the output of said comparator; a flip-flop having its input connected to the output of said inverter; a square wave oscIllator; a first two input AND gate having one input connected to one output of said square wave oscillator and a second input connected to one output of said flip-flop and an output connected to the base of said first transistor; and, a second two input AND gate having one input connected to the complementary output of said square wave oscillator and a second input connected to the complementary output of said flip-flop and an output connected to the base of said second transistor.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |