US3699425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Converter connections
Assignee: ABB Norden Holding AB
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Filing: 1971-05-07
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Granted: 1972-10-17
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Expires: 1991-05-07
Abstract
Abstract A single or multiphase converter connection includes a controlled first converter having an AC side and a DC side. A first reactor connects the DC side to a DC source. A capacitor is connected to the AC side of the first converter. A controlled current circuit is formed of a second reactor and controlled rectifiers connected to the second reactor to control the current therethrough. A control means is provided for firing said rectifiers with an adjustable delay angle so that the current circuit generates a variable capacitive current.
Inventors
- 👤 Bo Hermansson
- 👤 Kjeld Thorborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A self-commutated inverter comprising a controlled first converter connection, comprising controlled rectifiers, a DC source, said converter connection having an AC side, a first reactor connecting the DC side of the first converter connection to the DC source, a capacitor connected to the AC side, a variable inductance connection connected to said AC side and comprising a second reactor and controlled rectifiers connected to the second reactor to control the current therethrough, a control pulse means connected to said first converter connection and to said variable inductance connection and comprising a freerunning oscillator which is arranged to supply a first pulse train to said first converter connection, to ignite the controlled rectifiers thereof, said pulse train having a frequency corresponding to the frequency of the oscillator and to the desired inverter output frequency, said control pulse means being arranged to supply a second pulse train to the variable inductance connection for ignition of the controlled rectifiers thereof, said second pulse train having a frequency equal to that of said first pulse train, corresponding pulses of said first and second pulse trains being phase displaced in relation to each other.
Claim 2
Dependent Claim
189 words
A self-commutated inverter comprising a controlled first converter connection, comprising controlled rectifiers, a DC source, said converter connection having an AC side, a first reactor connecting the DC side of the first converter connection to the DC source, a capacitor connected to the AC side, a variable inductance connection connected to said AC side and comprising a second reactor and controlled rectifiers connected to the second reactor to control the current therethrough, a control pulse means connected to said first converter connection and to said variable inductance connection and comprising a freerunning oscillator which is arranged to supply a first pulse train to said first converter connection, to ignite the controlled rectifiers thereof, said pulse train having a frequency corresponding to the frequency of the oscillator and to the desired inverter output frequency, said control pulse means being arranged to supply a second pulse train to the variable inductance connection for ignition of the controlled rectifiers thereof, said second pulse train having a frequency equal to that of said first pulse train, corresponding pulses of said first and second pulse trains being phase displaced in relation to each other.
Claim 3
Dependent Claim
26 words
A self-commutated inverter according to claim 1, said variable inductance connection comprising an anti-parallel connection of two controlled rectifiers connected in series with the second reactor.
Claim 4
Dependent Claim
53 words
A self-commutated inverter according to claim 1, in which the second reactor is provided with a central tap which is joined to a first connection terminal of said variable inductance connection, and two oppositely directed controlled rectifiers connecting both ends of the reactor to a second connection terminal of the variable inductance connection.
Claim 5
Dependent Claim
35 words
A self-commutated inverter according to claim 1, in which the converter connection is n-phase and its AC side is provided with n-phase outputs, and having n identical variable inductance connections connected to the phase outputs.
Claim 6
Dependent Claim
21 words
A self-commutated inverter according to claim 4, in which the variable inductance connections are connected between each pair of phase outputs.
Claim 7
Dependent Claim
24 words
A self-commutated inverter according to claim 4, in which the variable inductance connections are connected between each phase output and an artificial zero point.
Claim 8
Dependent Claim
50 words
A self-commutated inverter according to claim 1, in which the variable inductance connection comprises a second controlled converter connection, the AC side of which is connected to the AC side of the first converter connection, said second reactor being connected between the DC terminals of said second controlled converter connection.
References Cited (Backward Citations)
US2341280A
Cited
GB996587A
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US3328596A
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US3558915A
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US3566148A
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US3551799A
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |