US3596168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor-triggering arrangement using dual pulse transformers having dissimilar characteristics
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1970-04-17
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Granted: 1971-07-27
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Expires: 1990-04-17
Abstract
Abstract To promote simultaneous firing of series-connected thyristors, each is controlled by two pulse transformers in series. The first transformer efficiently transmits the initial part of a control pulse having a very steep wave front, and the second transformer efficiently transmits the relatively long body of the pulse.
Inventors
- 👤 Jurgen Hengsberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:52
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
Improved control means for substantially simultaneously firing a plurality of series-connected controllable converter valves, the control means including a common source of periodic control pulses of long duration with steeply rising leading edges, wherein the improvement comprises for each valve 1, 2 the combination of: a. first pulse transforming means 5 having a primary winding 5a conductively connected to said common source 9 and a secondary winding 5b connected to the associated valve for transmitting an initial part of each control pulse to that valve, and b. second transforming means 6 having a primary winding 6a connected in series with said common source and with the primary winding 5a of said first transforming means so that each of said control pulses must flow through both of said primary windings, said second transforming means having a secondary winding 6b connected to the associated valve and being contemporaneously operative with said first transforming means for transmitting the remainder of each control pulse to the same valve, and said first and second transforming means having appreciably dissimilar characteristics.
Claim 2
Dependent Claim
175 words
Improved control means for substantially simultaneously firing a plurality of series-connected controllable converter valves, the control means including a common source of periodic control pulses of long duration with steeply rising leading edges, wherein the improvement comprises for each valve 1, 2 the combination of: a. first pulse transforming means 5 having a primary winding 5a conductively connected to said common source 9 and a secondary winding 5b connected to the associated valve for transmitting an initial part of each control pulse to that valve, and b. second transforming means 6 having a primary winding 6a connected in series with said common source and with the primary winding 5a of said first transforming means so that each of said control pulses must flow through both of said primary windings, said second transforming means having a secondary winding 6b connected to the associated valve and being contemporaneously operative with said first transforming means for transmitting the remainder of each control pulse to the same valve, and said first and second transforming means having appreciably dissimilar characteristics.
Claim 3
Dependent Claim
37 words
The arrangement according to claim 1 in which the first pulse transformer 5 has a low-loss core, and the second transformer 6 has a core consisting of material with high saturation induction compared to said low-loss core.
Claim 4
Dependent Claim
47 words
The arrangement according to claim 1 in which the secondary windings of the first and second transformers 5, 6 are connected in series to the control electrode of the associated valve, and the secondary winding 6b of the second transformer 6 is shunted by a diode 7.
Claim 5
Dependent Claim
23 words
The arrangement according to claim 1 in which both transforming means have magnetizable cores and means is provided for premagnetizing the transformer cores.
Claim 6
Dependent Claim
85 words
The arrangement according to claim 1 in which the secondary winding of said first transforming means 5 has a relatively low number of turns, and the second transforming means 6 has a higher number of secondary turns, and in which the primary windings of both of the first and second transforming means associated with a first one of said series-connected valves are connected in series with the primary windings of both of the first and second transforming means associated with another one of said valves.
Claim 7
Dependent Claim
37 words
The arrangement according to claim 5 in which the first pulse transformer 5 has a low-loss core, and the second transformer 6 has a core consisting of material with high saturation induction compared to said low-loss core.
Claim 8
Dependent Claim
19 words
The arrangement according to claim 5 in which each of said primary windings 5a, 6a) has a single turn.
Claim 9
Dependent Claim
41 words
The arrangement according to claim 5 in which the secondary windings of the first and second transformers 5, 6 are connected in parallel to the control electrode of the associated valve and are isolated from one another by diodes 3, 4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |