US3839666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphase high voltage inverter
Assignee: NI ELEKTROTEKHNICHESKY I Z URA
•
Filing: 1973-02-12
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Granted: 1974-10-01
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Expires: 1993-02-12
Abstract
Abstract A polyphase converter has a number of interconnected polyphase inverter stages. Extreme inverter stages connect the inverter to the d.c. circuit while intermediate inverter stages contain controlled rectifiers and capacitors connected to each other for stage transmission of charge from a higher voltage stage to a lower polyphase a.c. voltage under a corresponding mode of controlled rectifier commutation.
Inventors
- 👤 G Kitaev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A polyphase inverter for conversion of a d.c. voltage from a d.c. circuit into a low polyphase a.c. voltage to be fed to a corresponding a.c. load circuit, said inverter having a plurality of interconnected polyphase inverter stages, each of said plurality of polyphase inverter stages having at least two extreme inverter stages and at least one intermediate inverter stage disposed therebetween, said stages being connected to the d.c. circuit for multiplying current and dividing voltage at said load, each phase of said intermediate inverter stages comprising at least one capacitor, a plurality of commutating reactors and a plurality of controlled rectifiers, each phase of said extreme inverter stages comprising a controlled rectifier, means connecting each capacitor in each phase of said intermediate inverter stages to each other and the a.c. load circuit, means connecting said commutating reactors in a series circuit with each controlled rectifier of each phase of said intermediate stages, means connecting the controlled rectifiers of each phase of said intermediate inverter stages to capacitors of different phases of adjacent interter stages to effect cascade transmission of capacitor charge, and wherein said controlled rectifier of each phase of said extreme inverter stages is connected to said d.c. circuit.
Claim 2
Dependent Claim
201 words
A polyphase inverter for conversion of a d.c. voltage from a d.c. circuit into a low polyphase a.c. voltage to be fed to a corresponding a.c. load circuit, said inverter having a plurality of interconnected polyphase inverter stages, each of said plurality of polyphase inverter stages having at least two extreme inverter stages and at least one intermediate inverter stage disposed therebetween, said stages being connected to the d.c. circuit for multiplying current and dividing voltage at said load, each phase of said intermediate inverter stages comprising at least one capacitor, a plurality of commutating reactors and a plurality of controlled rectifiers, each phase of said extreme inverter stages comprising a controlled rectifier, means connecting each capacitor in each phase of said intermediate inverter stages to each other and the a.c. load circuit, means connecting said commutating reactors in a series circuit with each controlled rectifier of each phase of said intermediate stages, means connecting the controlled rectifiers of each phase of said intermediate inverter stages to capacitors of different phases of adjacent interter stages to effect cascade transmission of capacitor charge, and wherein said controlled rectifier of each phase of said extreme inverter stages is connected to said d.c. circuit.
Claim 3
Dependent Claim
35 words
A polyphase inverter according to claim 6, wherein the capacitor in each phase of each intermediate stage is connected in a closed circuit across said series connection of said controlled rectifiers and said commutating reactors.
Claim 4
Dependent Claim
24 words
A polyphase inverter according to claim 2, wherein two controlled rectifiers inserted in each said closed circuit are coupled by way of direct connection.
Claim 5
Dependent Claim
92 words
A high-voltage polyphase inverter according to claim 2, wherein two controlled rectifiers of each phase are directly coupled to each other and connected in a closed circuit with the capacitor of the given phase, the closEd circuit having three outlets of which two are from the capacitor and serve for series connection with the other capacitors of the same phase and wherein one outlet, coming out of the point of connection of two controlled rectifiers, is connected with analogous outlets of similar circuits of the other phases of the given intermediate stage.
Claim 6
Dependent Claim
45 words
A high-voltage polyphase inverter according to claim 2, wherein each capacitor of a phase is connected in a closed circuit with a capacitor of another phase by two controlled rectifiers, each controlled rectifier connecting opposite-sign, upper and lower outlets of two capacitors of different phases.
Claim 7
Dependent Claim
30 words
A high-voltage polyphase inverter according to claim 2, wherein each controlled rectifier of the extreme and intermediate inverter stages is series-connected in a circuit with at least one commutating reactor.
References Cited (Backward Citations)
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Cited
FR1374324A
Cited
US3327200A
Cited
US3399336A
Cited
GB1193163A
Cited
GB1214464A
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US3513376A
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |