US4674024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage modular inverter and control system thereof
Assignee: Westinghouse Electric Corp
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Filing: 1986-06-05
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Granted: 1987-06-16
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Expires: 2006-06-05
Abstract
Abstract Low voltage GTO inverter modules are combined to form a high-voltage multi-inverter system by connecting standard modules in a string with isolated DC links. Modular construction is arranged for building multiphase systems. Voltage control is effected by controlling selected modules on the DC sides, or by pulse-width modulation of the inverter of a selected module.
Inventors
- 👤 Derek A. Paice
- 👤 Charles W. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:11
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/49; H02M7/505; H02M7/515; H02M7/521; H02M7/525; H02M7/527
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
In a high voltage modular multi-inverter system, the combination of individual modules each comprising a DC voltage source having positive and negative DC terminals, a pole combination of serially connected power switches connected between said DC terminals about a center tap junction point and an output line derived from said center tap junction point, and control means for controlling for conduction said power switches to alternately connect said DC terminals to said output line at a predetermined selectable frequency; with two of said modules being associated in parallel as a pair to form between corresponding two said output lines an elementary phase output; a plurality of said pairs of modules being connected in series to develop a series output combining the same plurality of said elementary phase outputs in series, whereby a high-voltage resultant phase output is obtained.
Claim 2
Dependent Claim
138 words
In a high voltage modular multi-inverter system, the combination of individual modules each comprising a DC voltage source having positive and negative DC terminals, a pole combination of serially connected power switches connected between said DC terminals about a center tap junction point and an output line derived from said center tap junction point, and control means for controlling for conduction said power switches to alternately connect said DC terminals to said output line at a predetermined selectable frequency; with two of said modules being associated in parallel as a pair to form between corresponding two said output lines an elementary phase output; a plurality of said pairs of modules being connected in series to develop a series output combining the same plurality of said elementary phase outputs in series, whereby a high-voltage resultant phase output is obtained.
Claim 3
Dependent Claim
30 words
The multi-inverter system of claim 1 with another plurality of such said series-connected pairs of modules being provided to form a polyphase output combining such said high-voltage resultant phase outputs.
Claim 4
Dependent Claim
26 words
The multi-inverter system of claim 1 with three of said modules being associated as a threesome to form each between corresponding DC terminals, a three-phase module.
Claim 5
Dependent Claim
21 words
The multi-inverter system of claim 3, with said threesome combination of modules forming with said output lines a Y-connected three-phase module.
Claim 6
Dependent Claim
21 words
The multi-inverter system of claim 3 with said threesome combination of modules forming with said output lines a delta-connected three-phase module.
Claim 7
Dependent Claim
26 words
The multi-inverter system of claim 4 with a plurality of such said series-connected pairs of modules being provided on each phase of said Y-connected three-phase module.
Claim 8
Dependent Claim
26 words
The multi-inverter system of claim 5 with a plurality of such said series-connected pairs of modules being provided on each phase of said delta-connected three-phase module.
Claim 9
Dependent Claim
47 words
The multi-inverter system of claim 1 with at least two pluralities of said pairs of modules being provided, said pairs of modules being connected in series within a corresponding one of said two pluralities, the phasing of said modules being different from one plurality to the other.
Claim 10
Dependent Claim
36 words
The multi-inverter system of claim 1 with the resulting phase output voltage of said plurality of pairs of modules being controlled by regulating the voltage between the DC terminals of at least one of said pairs.
Claim 11
Dependent Claim
34 words
The multi-inverter system of claim 9 with said power switches being GTO devices, said DC terminals being supplied with DC voltage by thyristor-controlled means, said thyristor-controlled means being controlled to adjust said DC voltage.
Claim 12
Dependent Claim
33 words
The multi-inverter system of claim 1 with the resulting phase output voltage of said plurality of pairs of modules being controlled by controlling the inverter switches of at least one of said pairs.
Claim 13
Dependent Claim
21 words
The multi-inverter system of claim 11, with the inverter associated with said at least one pair being controlled by pulse-width modulation.
Claim 14
Dependent Claim
34 words
The multi-inverter system of claim 9 with said power switches being transistor devices, said DC terminals being supplied with DC voltage by thyristor-controlled means, said thyristor-controlled means being controlled to adjust said DC voltage.
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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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |