US3579082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for dividing and limiting the voltage for a converter having a plurality of thyristor valves connected in series
Assignee: BBC Brown Boveri AG Germany
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Filing: 1969-02-10
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Granted: 1971-05-18
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Expires: 1989-02-10
Abstract
Abstract An electrical converter arrangement comprises a chain of converter valves of the controllable semiconductor type such as thyristors connected in series. Condensers are connected in parallel with the semiconductor valves and the capacitance values of the condensers vary progressively downward in the direction towards the lowest potential point on the chain. Avalanche diodes arranged oppositely in series are also connected in parallel with the semiconductor valves, and resistances can be connected respectively in series with the condensers.
Inventors
- 👤 Hans Jurg Bossi
- 👤 Werner Faust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:40
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/15; H02M7/155; H02M7/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
An electrical converter arrangement as defined in claim 1 and which further includes a nonlinear choke connected into at least one end of said semiconductor valve chain.
Claim 2
Dependent Claim
45 words
An electrical converter arrangement as defined in claim 1 and which further includes a nonlinear choke connected into at least one end of said semiconductor valve chain, and a condenser connected in parallel to said choke and to at least one of said semicOnductor valves.
Claim 3
Dependent Claim
21 words
An electrical converter arrangement as defined in claim 3 and which further includes a resistance connected in advance of the condenser.
Claim 4
Dependent Claim
57 words
An electrical converter arrangement as defined in claim 1 wherein said condensers exhibit increasing capacitance values according to the equation Cn 1/2 .Co.n(n-1) as seen from the point of lowest potential on said chain, wherein Co denotes an initial value and Cn the capacitance value of the condenser associated with the nth valve and valve group respectively.
Claim 5
Dependent Claim
139 words
In an electrical converter arrangement the combination comprising a chain of converter valves of the controllable semiconductor type connected in series, said semiconductor converter valves exhibiting avalanche behavior only in the current blocking direction, pairs of diodes arranged oppositely in series and connected respectively in parallel with each of said semiconductor valves, the diode of each pair having a conducting direction opposite to that of the converter valve with which it is parallel connected being of the avalanche type, and capacitively graded condensers also connected in parallel with said semiconductor valves, the condenser having the highest capacitance value being located at that end of the valve chain having the higher potential and the respective capacitance values of the remaining parallel connected condensers being progressively decreased in the direction of the other end of the chain having the lowest potential.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |