Patent US3716719A successfully refreshed from Google Patents.
US3716719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulated output transformers
Assignee: Aerco Corp
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Filing: 1971-06-07
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Granted: 1973-02-13
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Expires: 1991-06-07
Abstract
Abstract A transformer core has three legs. A variable output secondary winding encircles one leg, and a primary winding encircles another. The voltage across the variable output secondary winding is controlled by varying the amount of leakage flux passing through the third leg. This can be accomplished by providing a separately formed core piece that is movable to vary its area of contact with the third leg. Alternatively, a control winding can be provided which encircles the third leg. The current induced in the control winding, which is modulated by a variable control impedance connected across it, produces a flux that, in proportion to its strength, opposes the primary winding flux, thereby increasing the amount of flux that passes through the secondary winding. A fixed output voltage can be obtained from an additional secondary winding that encircles the same leg as the primary winding.
Inventors
- 👤 H Angelery
- 👤 G Mohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:43
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10; H01F29/14; H01F29/143; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/17; Y10S174/24; Y10S174/25
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A transformer having fixed and variable outputs comprising a core including three interconnected legs, a variable output secondary winding encircling the first leg, a primary winding encircling the second leg, a fixed output secondary winding encircling the second leg, a control winding encircling the third leg, a variable control impedance connected across the control coil, the direction of each winding being such that the flux produced in the third leg by the control winding opposes the primary winding flux, whereby the voltage induced in the variable output secondary winding varies in accordance with the control impedance value selected and a set of leads and at least one switch arranged to selectively connect the control winding in parallel with a winding that encircles the second leg to produce additional flux in the third leg which opposes the flux produced by the primary winding.
Claim 2
Dependent Claim
142 words
A transformer having fixed and variable outputs comprising a core including three interconnected legs, a variable output secondary winding encircling the first leg, a primary winding encircling the second leg, a fixed output secondary winding encircling the second leg, a control winding encircling the third leg, a variable control impedance connected across the control coil, the direction of each winding being such that the flux produced in the third leg by the control winding opposes the primary winding flux, whereby the voltage induced in the variable output secondary winding varies in accordance with the control impedance value selected and a set of leads and at least one switch arranged to selectively connect the control winding in parallel with a winding that encircles the second leg to produce additional flux in the third leg which opposes the flux produced by the primary winding.
Claim 3
Dependent Claim
142 words
A transformer having fixed and variable outputs comprising a core including three interconnected legs, a variable output secondary winding encircling the first leg, a primary winding encircling the second leg, a fixed output secondary winding encircling the second leg, a control winding encircling the third leg, a variable control impedance connected across the control coil, the direction of each winding being such that the flux produced in the third leg by the control winding opposes the primary winding flux, whereby the voltage induced in the variable output secondary winding varies in accordance with the control impedance value selected and a set of leads and at least one switch arranged to selectively connect the control winding in parallel with a winding that encircles the second leg to produce additional flux in the third leg which opposes the flux produced by the primary winding.
Claim 4
Dependent Claim
142 words
A transformer having fixed and variable outputs comprising a core including three interconnected legs, a variable output secondary winding encircling the first leg, a primary winding encircling the second leg, a fixed output secondary winding encircling the second leg, a control winding encircling the third leg, a variable control impedance connected across the control coil, the direction of each winding being such that the flux produced in the third leg by the control winding opposes the primary winding flux, whereby the voltage induced in the variable output secondary winding varies in accordance with the control impedance value selected and a set of leads and at least one switch arranged to selectively connect the control winding in parallel with a winding that encircles the second leg to produce additional flux in the third leg which opposes the flux produced by the primary winding.
Claim 5
Dependent Claim
13 words
The transformer of claim 1 wherein the control impedance is a variable inductor.
Claim 6
Dependent Claim
41 words
The transformer of claim 1 wherein a portion of the core is movable to interpose at least one non-magnetic gap in the path of the leakage flux passing through the third leg and increasing the flux passing through the first leg.
Claim 7
Dependent Claim
28 words
The transformer of claim 1 wherein the core is dimensioned so that it does not become saturated at any point by the voltage applied to the primary coil.
Claim 8
Dependent Claim
114 words
A variable output transformer comprising a core including three legs, a secondary winding encircling the first leg, a primary winding encircling the second leg, a control winding encircling the third leg, a variable control impedance connected across the control winding, and a set of leads and at least one switch arranged to connect the control winding to a winding that encircles the second leg, the direction of The windings and the arrangement of the leads being such that the primary winding flux and the voltage applied by the leads both contribute to a current flow in the control winding that produces a flux in opposition to the primary winding flux in the third leg.
Claim 9
Dependent Claim
114 words
A variable output transformer comprising a core including three legs, a secondary winding encircling the first leg, a primary winding encircling the second leg, a control winding encircling the third leg, a variable control impedance connected across the control winding, and a set of leads and at least one switch arranged to connect the control winding to a winding that encircles the second leg, the direction of The windings and the arrangement of the leads being such that the primary winding flux and the voltage applied by the leads both contribute to a current flow in the control winding that produces a flux in opposition to the primary winding flux in the third leg.
Claim 10
Dependent Claim
21 words
The transformer of claim 5 wherein the winding that the leads are connected to is a portion of the primary winding.
Claim 11
Dependent Claim
160 words
A variable output transformer comprising a core including three legs, a secondary winding encircling the first leg, a primary winding encircling the second leg, a control winding encircling the third leg, the direction of the windings being such that the current induced in the control winding produces a flux which opposes the flow of primary winding flux in the third leg, a variable control impedance connected across the control winding whereby the current flowing therethrough can be varied, a movable core piece, a means for moving the movable core piece whereby at least one non-magnetic gap can be interposed in the path of primary winding flux passing through the third leg to further attenuate its flow and a set of leads and at least one switch arranged to selectively connect the control winding in parallel with a winding that encircles the second leg to produce additional flux in the third leg which opposes the flux produced by the primary winding.
Claim 12
Dependent Claim
160 words
A variable output transformer comprising a core including three legs, a secondary winding encircling the first leg, a primary winding encircling the second leg, a control winding encircling the third leg, the direction of the windings being such that the current induced in the control winding produces a flux which opposes the flow of primary winding flux in the third leg, a variable control impedance connected across the control winding whereby the current flowing therethrough can be varied, a movable core piece, a means for moving the movable core piece whereby at least one non-magnetic gap can be interposed in the path of primary winding flux passing through the third leg to further attenuate its flow and a set of leads and at least one switch arranged to selectively connect the control winding in parallel with a winding that encircles the second leg to produce additional flux in the third leg which opposes the flux produced by the primary winding.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |