US3681679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant voltage transformer three-phase ferro resonant
Assignee: Individual
•
Filing: 1971-05-07
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Granted: 1972-08-01
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Expires: 1991-05-07
Abstract
Abstract A constant voltage transformer apparatus having two magnetic cores with an input winding linking both cores and an output winding linked to only one of the cores. A resonant circuit is liked to the core having the output winding which core has a flux therein which is the sum of the flux from the input winding and the flux generated by the resonant circuit winding so that this core may be saturated for a constant output in the output winding while the second core is unsaturated and acts to absorb a rise of the input voltage. The symmetry arrangement of the cores and coils makes it especially useful for a multiphase constant voltage transformer. The transformer has an inherent current limiting characteristic and removal of the resonant circuit renders the transformer to be used as a conventional transformer with the added advantage of current limiting.
Inventors
- 👤 Kheemoy Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:46
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
A constant voltage transformer comprising in combination: a. a plurality of input windings; b. first magnetic core linked to each said input winding and adapted to absorb flux during an input voltage rise in said input windings; c. second magnetic core linked to each said input winding; d. a resonance circuit having a plurality of resonant windings coupled to at least one capacitance, each said resonant winding being linked to said second magnetic core and said resonance circuit being adapted to produce a resonance for producing secondary flux in said second magnetic core from capacitance current in said resonant circuit, said current being in time phase with the primary flux of the second core to produce an increase in the flux of said second core means whereby said second core will be saturated while said first core is still unsaturated; and a plurality of output windings linked to said second magnetic core for producing a substantially constant voltage output.
Claim 2
Dependent Claim
159 words
A constant voltage transformer comprising in combination: a. a plurality of input windings; b. first magnetic core linked to each said input winding and adapted to absorb flux during an input voltage rise in said input windings; c. second magnetic core linked to each said input winding; d. a resonance circuit having a plurality of resonant windings coupled to at least one capacitance, each said resonant winding being linked to said second magnetic core and said resonance circuit being adapted to produce a resonance for producing secondary flux in said second magnetic core from capacitance current in said resonant circuit, said current being in time phase with the primary flux of the second core to produce an increase in the flux of said second core means whereby said second core will be saturated while said first core is still unsaturated; and a plurality of output windings linked to said second magnetic core for producing a substantially constant voltage output.
Claim 3
Dependent Claim
30 words
The transformer in accordance with claim 1 in which said input winding, said output winding and said resonance circuit are three-phase circuits whereby said transformer operates in a three-phase mode.
Claim 4
Dependent Claim
46 words
The apparatus according to claim 2 in which said first core means is single core having three input windings thereon, and said second core means is a single core having three input windings thereon, three resonant windings thereon, and three output windings thereon for three-phase operation.
Claim 5
Dependent Claim
96 words
A multiple-phase constant voltage ferroresonant transformer having a symmetry structure comprising in combination: a. a plurality of input windings; b. a first core linked to each said input winding; c. a second core linked to each said input winding; d. resonant circuit means having a plurality of resonant windings each coupled only with said second core; and e. a plurality of output windings coupled only to said second core means for producing an output whereby the saturation fluxes on said second core occur at substantially the same time for a plurality phase constant voltage ferroresonant transformer.
Claim 6
Dependent Claim
96 words
A multiple-phase constant voltage ferroresonant transformer having a symmetry structure comprising in combination: a. a plurality of input windings; b. a first core linked to each said input winding; c. a second core linked to each said input winding; d. resonant circuit means having a plurality of resonant windings each coupled only with said second core; and e. a plurality of output windings coupled only to said second core means for producing an output whereby the saturation fluxes on said second core occur at substantially the same time for a plurality phase constant voltage ferroresonant transformer.
Claim 7
Dependent Claim
20 words
The apparatus according to claim 4 having three input windings and three output windings for operation in a three-phase mode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |