US3579088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferroresonant transformer with controllable flux
Assignee: Individual
•
Filing: 1969-04-08
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Granted: 1971-05-18
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Expires: 1989-04-08
Abstract
Abstract A ferroresonant transformer with means for varying saturation flux capacity for controlling the transformer output. A ferroresonant transformer with at least a portion of the core structure carrying the secondary winding having two separate sections providing parallel magnetic paths for the secondary and resonant flux, with a control winding on one of the sections and a switching circuit for opening and closing the control winding. A low frequency version utilizing E and I laminations with the control winding on one of the outer legs of the E. Another low frequency version utilizing E and I laminations with the control winding encircling a portion of the secondary magnetic circuit. A high frequency version utilizing a plurality of toroid cores with the control winding on one of the cores.
Inventors
- 👤 Taylor C Fletcher
- 👤 Lawrence M Silva
- 👤 Bruce L Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:17
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/13; G05F3/00; G05F3/02; G05F3/04; G05F3/06; H; H01; H01F; H01F29/00; H01F29/14; H01F29/143; H01F29/146
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
86 words
A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.
Claim 2
Dependent Claim
86 words
A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.
Claim 3
Dependent Claim
25 words
2. A ferroresonant transformer as defined in claim 1 wherein the core structure includes an opening therethrough, with said two sections forming opposite walls thereof.
Claim 4
Dependent Claim
30 words
A ferroresonant transformer as defined in claim 1 wherein said core structure includes stacked E and I laminations, with said two sections comprising the outer legs of the E laminations.
Claim 5
Dependent Claim
39 words
A ferroresonant transformer as defined in claim 1 wherein said core structure includes at least two groups of stacked E and I laminations, with said two sections comprising the center legs of two different groups of said stacked laminations.
Claim 6
Dependent Claim
26 words
A ferroresonant transformer as defined in claim 1 wherein said core structure is formed of a plurality of toroids, with said two sections comprising separate toroids.
Claim 7
Dependent Claim
50 words
A ferroresonant transformer as defined in claim 1 wherein said core structure includes three sets of stacked E and I laminations assembled side by side, with the center set inverted with respect to the outer sets, and with said two sections comprising the center legs of the outer sets, respectively.
Claim 8
Dependent Claim
93 words
A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding as a function of the secondary voltage, with no currEnt source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.
Claim 9
Dependent Claim
93 words
A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding as a function of the secondary voltage, with no currEnt source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.
Claim 10
Dependent Claim
16 words
A ferroresonant transformer as defined in claim 7 wherein said switch means includes a synchronized oscillator.
Claim 11
Dependent Claim
16 words
A ferroresonant transformer as defined in claim 7 wherein said switch means includes a phase shifter.
Claim 12
Dependent Claim
16 words
A ferroresonant transformer as defined in claim 7 wherein said switch means includes a saturable reactor.
Claim 13
Dependent Claim
22 words
A ferroresonant transformer as defined in claim 7 wherein said switch means provides for switching operation every half-cycle of the supply voltage.
Claim 14
Dependent Claim
22 words
A ferroresonant transformer as defined in claim 7 wherein said switch means provides for switching operation every cycle of the supply voltage.
Claim 15
Dependent Claim
57 words
A ferroresonant transformer as defined in claim 7 including rectifier means connected across the secondary winding for producing a DC control signal voltage; and said switch means includes a switch element and a control circuit having said control signal voltage as an input for closing said switch element when said control signal voltage exceeds a predetermined magnitude.
Claim 16
Dependent Claim
60 words
A ferroresonant transformer as defined in claim 13 in which said control circuit includes an integrator connected for charging from said control winding, and a trigger unit having the integrator output and said control signal voltage as inputs with said trigger unit actuating said switch element at least once each cycle of the supply voltage connected to the primary winding.
Claim 17
Dependent Claim
18 words
A ferroresonant transformer as defined in claim 14 in which said integrator comprises a resistor and capacitor circuit.
Claim 18
Dependent Claim
20 words
A ferroresonant transformer as defined in claim 14 in which said integrator comprises an operational amplifier connected as an integrator.
Claim 19
Dependent Claim
140 words
A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; and means for varying the saturation flux capacity in the core structure by switching the secondary and resonant flux between a first condition with flux change occurring in both of said sections and a second condition with substantially all of the flux change occurring in one of said sections, said means for varying including a control winding on the other of said sections, and means for closing and opening a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said other section.
Claim 20
Dependent Claim
140 words
A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; and means for varying the saturation flux capacity in the core structure by switching the secondary and resonant flux between a first condition with flux change occurring in both of said sections and a second condition with substantially all of the flux change occurring in one of said sections, said means for varying including a control winding on the other of said sections, and means for closing and opening a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said other section.
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |