US5148357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auto-connected hexagon transformer for a 12-pulse converter
Assignee: Westinghouse Electric Corp
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Filing: 1991-10-07
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Granted: 1992-09-15
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Expires: 2011-10-07
Abstract
Abstract A 12-pulse converter of lower rating and minimal current harmonics is obtained with an auto-connected regular hexagon transformer including a delta winding in its center.
Inventors
- 👤 Derek A. Paice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:26
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162; H01; H01F; H01F30/00; H01F30/06; H01F30/12; H02M7/1552
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
In a 12-pulse static converter for converting three-phase alternating current (AC) power into direct current (DC) across a positive and a negative DC output terminal, with a polygonal succession of windings forming a regular hexagon with hexagon windings and with 12 rectifying devices equally distributed about 12 successive tappings from said windings and at 30 degrees to one another; the combination of: three AC input terminals connected to said hexagon windings at 120 degrees to one another; and a set of three windings symmetrically and centrally disposed within said hexagon windings and coupled thereto in a delta mode; each of said hexagon windings including a central winding means disposed between two equally placed side windings of lesser ampere-turn ratio for cooperating with said three windings on said delta mode to reduce harmonic current in said direct current.
Claim 2
Dependent Claim
137 words
In a 12-pulse static converter for converting three-phase alternating current (AC) power into direct current (DC) across a positive and a negative DC output terminal, with a polygonal succession of windings forming a regular hexagon with hexagon windings and with 12 rectifying devices equally distributed about 12 successive tappings from said windings and at 30 degrees to one another; the combination of: three AC input terminals connected to said hexagon windings at 120 degrees to one another; and a set of three windings symmetrically and centrally disposed within said hexagon windings and coupled thereto in a delta mode; each of said hexagon windings including a central winding means disposed between two equally placed side windings of lesser ampere-turn ratio for cooperating with said three windings on said delta mode to reduce harmonic current in said direct current.
Claim 3
Dependent Claim
15 words
The converter of claim 1 with said delta windings each having said lesser ampere-turn ratio.
Claim 4
Dependent Claim
20 words
The converter of claim 2 with each one of said delta windings being mainly coupled with two opposite hexagon windings.
Claim 5
Dependent Claim
22 words
The converter of claim 3 with said 12 tappings being at a nodal point between a central winding and a side winding.
Claim 6
Dependent Claim
16 words
The converter of claim 4 with an inductor in series with each of said rectifier devices.
Claim 7
Dependent Claim
30 words
The converter of claim 4 with each one of said inductors being common to two rectifier devices placed at 120 degrees relative to of said rectifier devices about said hexagon.
References Cited (Backward Citations)
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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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |