US3628035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor-rectifier controlled by light pulses of equal intensity at the end of light-conducting rods
Assignee: ABB Norden Holding AB
•
Filing: 1970-08-13
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Granted: 1971-12-14
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Expires: 1990-08-13
Abstract
Abstract A thyristor rectifier for high voltage is formed of a number of series connected thyristors each having its own control circuit to which control pulses are supplied by a common control device. Glass fiberlike conductors are used for transmitting the control pulses in the form of light pulses. The light intensity of the light pulses to some of the thyristors is adjusted in relation to others so as to adjust the firing times in relation to each other.
Inventors
- 👤 Karl Erik Olsson
- 👤 Keijo Hellgren
- 👤 George Lindblom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:58
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/096; H10; H10F; H10F30/00; H10F30/20; H10F30/21; H10F30/26; H10F30/263; H10W; H10W90/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A thyristor-rectifier for high voltage, comprising a plurality of series-connected thyristors; an individual control circuit for each of said thyristors; means to supply control pulses to said control circuits comprising a common control device for said thyristors for producing control pulses; and light conductors of glass fiber for transmitting said control pulses in the form of light pulses from said control device to said individual control circuits, said control pulse supply means including means to vary the light intensity of the light pulses to some of the thyristors in relation to other, whereby to adjust the firing times of the thyristors in relation to each other.
Claim 2
Dependent Claim
106 words
A thyristor-rectifier for high voltage, comprising a plurality of series-connected thyristors; an individual control circuit for each of said thyristors; means to supply control pulses to said control circuits comprising a common control device for said thyristors for producing control pulses; and light conductors of glass fiber for transmitting said control pulses in the form of light pulses from said control device to said individual control circuits, said control pulse supply means including means to vary the light intensity of the light pulses to some of the thyristors in relation to other, whereby to adjust the firing times of the thyristors in relation to each other.
Claim 3
Dependent Claim
36 words
A thyristor-rectifier according to claim 1, in which said variation is carried out by arranging the end of the light conductor concerned at a certain distance from the emitter or the receiver of the light pulse.
Claim 4
Dependent Claim
12 words
A thyristor-rectifier according to claim 2, in which said distance is variable.
Claim 5
Dependent Claim
32 words
A thyristor-rectifier according to claim 1, in which said variation is carried out by insertion of a means in the light path for changing the transmission of light by said glass fibers.
Claim 6
Dependent Claim
39 words
A thyristor-rectifier according to claim 1, in which the control device comprises individual light pulse emitters for the thyristors or groups of these, said variation being carried out by reducing the light intensity of some of said light-pulse emitters.
References Cited (Backward Citations)
US3355600A
Cited
US3567972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |