US3703676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter
Assignee: ABB Norden Holding AB
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Filing: 1971-05-07
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Granted: 1972-11-21
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Expires: 1991-05-07
Abstract
Abstract An inverter has a connection group arranged to be fed with DC voltage and which includes two controlled main rectifiers in series with each other connected to the DC source and a connection point between which forms the output terminal for the output voltage of the inverter. These rectifiers are fired alternately. Two controlled commutating rectifiers in series are arranged to be supplied with DC voltage and are fired alternately in order to extinguish the main rectifiers. A commutating capacitor and a reactance are connected in series between the connection point of the main rectifiers and a point between the commutating rectifiers. An inductive element is connected with the capacitor to form an oscillating circuit so as to recharge the capacitor at each commutation. A series connection including the commutating rectifiers is supplied with positive and negative DC voltage of higher and lower potential respectively than that of the positive and negative poles of the first DC source. A limiting rectifier having such polarity that it is made reverse blocking by the voltage of the first DC source is connected between each pole of the first DC source and the terminal of the commutating capacitor facing the AC output.
Inventors
- 👤 Kjell Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:48
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
293 words
Inverter comprising at least one connection group which is connected to and arranged to be fed from a first DC source, each connection group comprising a. two controlled main rectifiers, in series with each other, connected between the two poles of the first DC source, their connection point forming the output terminal for the output voltage of the inverter, and means to fire these rectifiers alternately, b. two controlled commutating rectifiers connected in series with each other to fire the commutating rectifiers alternately in order to extinguish the main rectifiers, c. a commutating capacitor connected between the connection point of the main rectifiers and a point in said series connection situated between the commutating rectifiers, d. means including at least one inductive element forming with the commutating capacitor a series oscillating circuit to recharge the capacitor at each commutation, in which is provided, e. a second DC source between the poles of which said series connection including the commutating rectifiers is connected, the positive and negative poles of this second DC source having higher and lower potential, respectively, than the positive and negative poles of the first DC source, f. a limiting rectifier connected between each pole of the first DC source and the terminal of the commutating capacitor facing the AC output, said limiting rectifier having such polarity that it is made reverse blocking by the voltage of the first DC source, g. the inductive element comprising two reactors, each reactor having two coils connected together inductively, each reactor having one winding connected in series with the commutating rectifier connected to the second DC source pole having one polarity and the other winding in series with the limiting rectifier connected to the pole of said first DC source of the other polarity.
Claim 2
Dependent Claim
293 words
Inverter comprising at least one connection group which is connected to and arranged to be fed from a first DC source, each connection group comprising a. two controlled main rectifiers, in series with each other, connected between the two poles of the first DC source, their connection point forming the output terminal for the output voltage of the inverter, and means to fire these rectifiers alternately, b. two controlled commutating rectifiers connected in series with each other to fire the commutating rectifiers alternately in order to extinguish the main rectifiers, c. a commutating capacitor connected between the connection point of the main rectifiers and a point in said series connection situated between the commutating rectifiers, d. means including at least one inductive element forming with the commutating capacitor a series oscillating circuit to recharge the capacitor at each commutation, in which is provided, e. a second DC source between the poles of which said series connection including the commutating rectifiers is connected, the positive and negative poles of this second DC source having higher and lower potential, respectively, than the positive and negative poles of the first DC source, f. a limiting rectifier connected between each pole of the first DC source and the terminal of the commutating capacitor facing the AC output, said limiting rectifier having such polarity that it is made reverse blocking by the voltage of the first DC source, g. the inductive element comprising two reactors, each reactor having two coils connected together inductively, each reactor having one winding connected in series with the commutating rectifier connected to the second DC source pole having one polarity and the other winding in series with the limiting rectifier connected to the pole of said first DC source of the other polarity.
Claim 3
Dependent Claim
293 words
Inverter comprising at least one connection group which is connected to and arranged to be fed from a first DC source, each connection group comprising a. two controlled main rectifiers, in series with each other, connected between the two poles of the first DC source, their connection point forming the output terminal for the output voltage of the inverter, and means to fire these rectifiers alternately, b. two controlled commutating rectifiers connected in series with each other to fire the commutating rectifiers alternately in order to extinguish the main rectifiers, c. a commutating capacitor connected between the connection point of the main rectifiers and a point in said series connection situated between the commutating rectifiers, d. means including at least one inductive element forming with the commutating capacitor a series oscillating circuit to recharge the capacitor at each commutation, in which is provided, e. a second DC source between the poles of which said series connection including the commutating rectifiers is connected, the positive and negative poles of this second DC source having higher and lower potential, respectively, than the positive and negative poles of the first DC source, f. a limiting rectifier connected between each pole of the first DC source and the terminal of the commutating capacitor facing the AC output, said limiting rectifier having such polarity that it is made reverse blocking by the voltage of the first DC source, g. the inductive element comprising two reactors, each reactor having two coils connected together inductively, each reactor having one winding connected in series with the commutating rectifier connected to the second DC source pole having one polarity and the other winding in series with the limiting rectifier connected to the pole of said first DC source of the other polarity.
Claim 4
Dependent Claim
293 words
Inverter comprising at least one connection group which is connected to and arranged to be fed from a first DC source, each connection group comprising a. two controlled main rectifiers, in series with each other, connected between the two poles of the first DC source, their connection point forming the output terminal for the output voltage of the inverter, and means to fire these rectifiers alternately, b. two controlled commutating rectifiers connected in series with each other to fire the commutating rectifiers alternately in order to extinguish the main rectifiers, c. a commutating capacitor connected between the connection point of the main rectifiers and a point in said series connection situated between the commutating rectifiers, d. means including at least one inductive element forming with the commutating capacitor a series oscillating circuit to recharge the capacitor at each commutation, in which is provided, e. a second DC source between the poles of which said series connection including the commutating rectifiers is connected, the positive and negative poles of this second DC source having higher and lower potential, respectively, than the positive and negative poles of the first DC source, f. a limiting rectifier connected between each pole of the first DC source and the terminal of the commutating capacitor facing the AC output, said limiting rectifier having such polarity that it is made reverse blocking by the voltage of the first DC source, g. the inductive element comprising two reactors, each reactor having two coils connected together inductively, each reactor having one winding connected in series with the commutating rectifier connected to the second DC source pole having one polarity and the other winding in series with the limiting rectifier connected to the pole of said first DC source of the other polarity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |