US3671846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated polyphase inverter system
Assignee: Gates LearJet Corp
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Filing: 1971-01-20
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Granted: 1972-06-20
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Expires: 1991-01-20
Abstract
Abstract An important class of polyphase inverters employ pulse width modulation in the regulation of the power output voltage level. Such inverters are generally constructed in two symmetrical sections that are interconnected by summing transformers to a common polyphase output. Shifting the relative phase between the signal sets that gate the SCRs of the respective inverter sections correspondingly modulates the width of their resultant square wave pulses. The system output voltage level is correspondingly controlled. The secondary windings of the summing transformers of the present invention are uniquely arranged and interconnected to substantially reduce the size, weight and cost of the output transformer array. Further, a four-wire three-phase inverter system is directly provided without an auxiliary transformer that was heretofor required therefor.
Inventors
- 👤 Philip D Corey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:51
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/497
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
A polyphase inverter system comprising: first and second square wave generators that are circuitally symmetrical, said generators being constructed with a plurality of paired controlled rectifiers; a first summing transformer having a primary winding for each phase of the system in circuit connection with its said paired rectifiers of its associate first generator, and having two secondary windings with its primary winding; a second summing transformer having a primary winding for each phase of the system in circuit connections with its said paired rectifiers of its associate second generator, and having three secondary windings with each of its primary windings; first and second sequential triggering signal means for determining the respective polyphase square wave generation by their associate generators; phase shift control means responsive to a selected system operating parameter for changing the signal phase relation between said first and second signal means and correspondingly effect the output load voltage level of the inverter system; and a summing network interconnecting the secondary windings among said transformers to provide the polyphase output lines for the system, the said secondary windings of the respective summing transformers being constructed and arranged to directly provide a neutral wire power output line for the system while cancelling out harmonic components in their summing action below the eleventh multiple of the system frequency.
Claim 2
Dependent Claim
217 words
A polyphase inverter system comprising: first and second square wave generators that are circuitally symmetrical, said generators being constructed with a plurality of paired controlled rectifiers; a first summing transformer having a primary winding for each phase of the system in circuit connection with its said paired rectifiers of its associate first generator, and having two secondary windings with its primary winding; a second summing transformer having a primary winding for each phase of the system in circuit connections with its said paired rectifiers of its associate second generator, and having three secondary windings with each of its primary windings; first and second sequential triggering signal means for determining the respective polyphase square wave generation by their associate generators; phase shift control means responsive to a selected system operating parameter for changing the signal phase relation between said first and second signal means and correspondingly effect the output load voltage level of the inverter system; and a summing network interconnecting the secondary windings among said transformers to provide the polyphase output lines for the system, the said secondary windings of the respective summing transformers being constructed and arranged to directly provide a neutral wire power output line for the system while cancelling out harmonic components in their summing action below the eleventh multiple of the system frequency.
Claim 3
Dependent Claim
49 words
A polyphase inverter system as claimed in claim 1, in which the inverter is a three-phase system at output frequency fo, and the said generators provide respective square wave outputs at 120* phase separation for their associate transformers, whereby the triplet harmonic components (3nfo) cancel out at the transformers.
Claim 4
Dependent Claim
42 words
A polyphase inverter system as claimed in claim 2, in which the said first summing transformer has two secondary windings with each of its primary windings, and the said second summing transformer has three secondary windings with each of its primary windings.
Claim 5
Dependent Claim
56 words
A polyphase inverter system as claimed in claim 1, in which the secondary windings of the said first summing transformer each have substantially the same number of turns, and one secondary winding of each phase of the said second summing transformer has substantially twice the number of turns as the associated other two secondary windings thereof.
Claim 6
Dependent Claim
47 words
A polyphase inverter system as claimed in claim 4, in which the number of turns of each of said secondary windings of the said first summing transformer has approximately 0.866 times the number of turns as the said larger secondary windings of the said second summing transformer.
Claim 7
Dependent Claim
92 words
A polyphase inverter system as claimed in claim 3, in which the secondary windings of the said first summing transformer each have substantially the same number of turns, and one secondary winding of each phase of the said second summing transformer has substantially twice the number of turns as the associated other two secondary windings thereof, the number of turns of each of said secondary windings of the said first summing transformer has approximately 0.866 times the number of turns as the said larger secondary windings of the said second summing transformer.
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |