US3573606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed-loop ferroresonant voltage regulator which simulates core saturation
Assignee: AT&T Inc
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Filing: 1969-10-01
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Granted: 1971-04-06
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Expires: 1989-10-01
Abstract
Abstract In a ferroresonant voltage regulator of the type in which transformer core saturation is simulated by the switching of a separate inductor effectively across the ferrocapacitor in response to the volt-time integral of output voltage, the separate inductor is incorporated into the main transformer as an ''''inductance'''' winding on the output or center leg of three core legs. Unwanted magnetic coupling between the inductance winding and the output winding is substantially eliminated by a magnetic shunt between the windings, and the inductance winding is wound in a direction to minimize the flux in the shunt. The inductance is optimized by the choice of thickness of a nonmagnetic spacer between the transformer core endpiece and the legs.
Inventors
- 👤 Harry P Hart
- 👤 Robert J Kakalec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:39
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06; G05F1/00; G05F1/10; G05F1/12; G05F1/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
Voltage regulating apparatus comprising a transformer core having three legs and two magnetic end sections, each end section bridging a corresponding end of said three legs to form a closed magnetic structure, an input winding, an output winding, an inductance winding, each of said input, output and inductance windings being wound on the center leg of said three legs, a first magnetic shunt means disposed between the outer two legs of said three legs and the portion of said center leg between said input and said output windings to reduce the mutual magnetic coupling between said input and said output windings, second magnetic shunt means disposed between said outer two legs and the portion of said center leg between said output winding and said inductance winding to substantially eliminate the mutual magnetic coupling between said output winding and said inductance winding, a ferrocapacitor coupled to said output winding, an AC voltage source connected to said input winding, a load coupled to said output winding, an integrating circuit including an integrating capacitor coupled to said output winding for developing a voltage proportional to the volt-time integral of the voltage across said ferrocapacitor, and switching means connected to said integrating capacitor and said inductance winding to intermittently couple said inductance winding to said output winding in response to the voltage across said integrating capacitor and thereby reverse the charge on said ferrocapacitor.
Claim 2
Dependent Claim
230 words
Voltage regulating apparatus comprising a transformer core having three legs and two magnetic end sections, each end section bridging a corresponding end of said three legs to form a closed magnetic structure, an input winding, an output winding, an inductance winding, each of said input, output and inductance windings being wound on the center leg of said three legs, a first magnetic shunt means disposed between the outer two legs of said three legs and the portion of said center leg between said input and said output windings to reduce the mutual magnetic coupling between said input and said output windings, second magnetic shunt means disposed between said outer two legs and the portion of said center leg between said output winding and said inductance winding to substantially eliminate the mutual magnetic coupling between said output winding and said inductance winding, a ferrocapacitor coupled to said output winding, an AC voltage source connected to said input winding, a load coupled to said output winding, an integrating circuit including an integrating capacitor coupled to said output winding for developing a voltage proportional to the volt-time integral of the voltage across said ferrocapacitor, and switching means connected to said integrating capacitor and said inductance winding to intermittently couple said inductance winding to said output winding in response to the voltage across said integrating capacitor and thereby reverse the charge on said ferrocapacitor.
Claim 3
Dependent Claim
38 words
Voltage regulating apparatus as in claim 1 including nonmagnetic spacing means disposed between the one of said core endpieces nearest said inductance winding and said three core legs whereby the inductance of said inductance winding may be adjusted.
Claim 4
Dependent Claim
61 words
Voltage regulating apparatus as in claim 1 including an auxiliary winding wound on said center transformer core leg closely coupled to said output winding, wherein said load is connected across at least a portion of said output winding, said integrating circuit is connected across said auxiliary winding, and said switching means operates to connect said inductance winding across said auxiliary winding.
Claim 5
Dependent Claim
35 words
Voltage regulating apparatus as in claim 1 wherein said switching means comprises an AC semiconductor switch having a conducting path connected in series with said inductor and a gating path connected across said integrating capacitor.
Claim 6
Dependent Claim
36 words
Voltage regulating apparatus as in claim 1 including feedback means responsive to the voltage across said load and connected to said integrating circuit and across said load to vary the charging rate of said integrating capacitor.
Claim 7
Dependent Claim
82 words
Voltage regulating apparatus as in claim 5 wherein said integratiNg circuit includes an integrating resistor, and said feedback means comprises an error detector connected across said load for producing an error voltage proportional to the difference between the voltage across said load and a reference voltage, a full wave bridge rectifier having a pair of AC terminals connected across said integrating resistor and a pair of DC terminals, and unidirectional conductive means responsive to said error voltage connected across said DC terminals.
Claim 8
Dependent Claim
67 words
Voltage regulating apparatus as in claim 3 wherein said inductance winding, said switching means, and said auxiliary winding are interconnected in such polarities that the flux in said second magnetic shunt means generated by the current in said inductance winding opposes the flux in said second shunt means generated by the current in said input winding whereby the required size of said second shunt means is reduced.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |