US3708744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulating and filtering transformer
Assignee: ABB Inc USA
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Filing: 1971-08-18
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Granted: 1973-01-02
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Expires: 1991-08-18
Abstract
Abstract Transformer for providing a regulated and filtered output voltage. Input voltage is applied to an input winding which is wound around two magnetic cores. One magnetic core saturates for part of each half-cycle of the induced alternating flux during normal operation. The other magnetic core does not saturate during normal operation and includes air gaps in the legs thereof. An output winding is positioned around the nonsaturating core and connected in parallel with a capacitor to form an output tank circuit resonant at the operating frequency of the transformer.
Inventors
- 👤 D Stephens
- 👤 J Banic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
198 words
A regulating and filtering transformer comprising a first magnetic core having first and second regions, a second magnetic core having first and second regions, an input winding having a plurality of turns with each of said turns wound around the second region of said first magnetic core and the first region of said second magnetic core to induce alternating flux therein, an output winding which links the flux in the second region of said second magnetic core and which is connected in parallel circuit relationship with a capacitor to provide a resonant tank circuit, said first magnetic core being constructed and dimensioned to cause it to saturate during a portion of each half-cycle of the alternating flux therein, said second magnetic core being constructed and dimensioned to provide a higher reluctance path for the alternating flux induced by said input winding than the path provided by said first magnetic core when said first magnetic core is not saturated, and said second magnetic core being constructed and dimensioned to provide a lower reluctance path for the alternating flux produced by said input winding than the path provided by said first magnetic core when said first magnetic core is saturated.
Claim 2
Dependent Claim
198 words
A regulating and filtering transformer comprising a first magnetic core having first and second regions, a second magnetic core having first and second regions, an input winding having a plurality of turns with each of said turns wound around the second region of said first magnetic core and the first region of said second magnetic core to induce alternating flux therein, an output winding which links the flux in the second region of said second magnetic core and which is connected in parallel circuit relationship with a capacitor to provide a resonant tank circuit, said first magnetic core being constructed and dimensioned to cause it to saturate during a portion of each half-cycle of the alternating flux therein, said second magnetic core being constructed and dimensioned to provide a higher reluctance path for the alternating flux induced by said input winding than the path provided by said first magnetic core when said first magnetic core is not saturated, and said second magnetic core being constructed and dimensioned to provide a lower reluctance path for the alternating flux produced by said input winding than the path provided by said first magnetic core when said first magnetic core is saturated.
Claim 3
Dependent Claim
25 words
The regulating and filtering transformer of claim 1 wherein the second magnetic core includes an air gap for increasing the reluctance of the magnetic core.
Claim 4
Dependent Claim
57 words
The regulating transformer of claim 1 wherein the second magnetic core includes two air gaps for increasing the reluctance of the magnetic core, one of the air gaps being positioned in the first region of said second magnetic core and the other of said air gaps being positioned in the second region of said second magnetic core.
Claim 5
Dependent Claim
17 words
The regulating and filtering transformer of claim 3 wherein the two air gaps have equal gap distances.
Claim 6
Dependent Claim
18 words
The regulating and filtering transformer of claim 1 wherein the magnetic cores are constructed of layers of laminations.
Claim 7
Dependent Claim
17 words
The regulating and filtering transformer of claim 1 wherein the magnetic cores are of the wound type.
Claim 8
Dependent Claim
258 words
A regulating and filtering transformer comprising a first wound magnetic core having first and second regions, a second wound magnetic core havinG first and second regions, and an input winding having a plurality of turns with each of said turns wound around the second region of said first wound magnetic core and the first region of said second wound magnetic core, said input winding inducing alternating flux into said first and second wound magnetic cores, an output winding positioned around the second region of said second magnetic core and connected in parallel circuit relationship with a capacitor to provide a resonant tank circuit, said first magnetic core being constructed and dimensioned to cause it to saturate during a portion of each half-cycle of the alternating flux therein, said second wound magnetic core being dimensioned and containing air gaps to provide, when said first wound magnetic core is not saturated, a higher reluctance path for the alternating flux provided by said input winding than the path provided by said first wound magnetic core, said second wound magnetic core providing, when said first wound magnetic core is saturated, a lower reluctance path for the alternating flux induced by said input winding than the path provided by said first wound magnetic core, a first of said air gaps being positioned in the first region of said second wound magnetic core, a second of said air gaps being positioned in the second region of said wound magnetic core, with the gap distances of said first and second air gaps being substantially equal.
Claim 9
Dependent Claim
258 words
A regulating and filtering transformer comprising a first wound magnetic core having first and second regions, a second wound magnetic core havinG first and second regions, and an input winding having a plurality of turns with each of said turns wound around the second region of said first wound magnetic core and the first region of said second wound magnetic core, said input winding inducing alternating flux into said first and second wound magnetic cores, an output winding positioned around the second region of said second magnetic core and connected in parallel circuit relationship with a capacitor to provide a resonant tank circuit, said first magnetic core being constructed and dimensioned to cause it to saturate during a portion of each half-cycle of the alternating flux therein, said second wound magnetic core being dimensioned and containing air gaps to provide, when said first wound magnetic core is not saturated, a higher reluctance path for the alternating flux provided by said input winding than the path provided by said first wound magnetic core, said second wound magnetic core providing, when said first wound magnetic core is saturated, a lower reluctance path for the alternating flux induced by said input winding than the path provided by said first wound magnetic core, a first of said air gaps being positioned in the first region of said second wound magnetic core, a second of said air gaps being positioned in the second region of said wound magnetic core, with the gap distances of said first and second air gaps being substantially equal.
References Cited (Backward Citations)
US2310742A
Cited
US2442214A
Cited
US2706271A
Cited
US3546571A
Cited
US3579088A
Cited
US3584290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |