US3566211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor-type semiconductor device with auxiliary starting electrodes
Assignee: ABB Norden Holding AB
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Filing: 1967-10-23
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Granted: 1971-02-23
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Expires: 1987-10-23
Abstract
Abstract A thyristor is constituted by a body having at least four alternately P conducting and N conducting layers with two main electrodes for the load current; one of the layers has a connection for ignition current; one part of the body has a blocking voltage lower than that of the other parts; an auxiliary contact applied on such part is connected to the ignition current connection so that, when the blocking voltage of such part is exceeded, current is supplied to the ignition current connection.
Inventors
- 👤 Per Svedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:01
CPC Classifications
H; H10; H10D; H10D18/00; H10D48/00; H10D48/30; H10D48/32; H10D48/36; H10D62/00; H10D62/10; H10D62/129; H10D62/60; H10D99/00; H10P; H10P10/00; H10W; H10W42/00; H10W72/00; H10W72/071; H10W72/075; H10W72/07551; H10W72/07554
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A thyristor having a body of a semiconductor material with at least four alternately P conducting and N conducting layers, the two outer layers comprising emitter layers provided with main electrodes for the load current and two inner layers comprising base layers, a connection for supplying ignition current to a first of said base layers in a major surface of the thyristor, an auxiliary contact applied to a peripheral zone of said base layer at said major surface, at least one auxiliary thyristor formed on the semiconductor body at said major surface between said auxiliary contact and said connection for supplying ignition current, one main electrode of the auxiliary thyristor being directly connected to said connection for supplying ignition current of the main thyristor, said auxiliary contact being directly connected to the auxiliary thyristor''s connection for supplying ignition current, thereby turning on the auxiliary thyristor which tHen supplies ignition current for the main thyristor.
Claim 2
Dependent Claim
154 words
A thyristor having a body of a semiconductor material with at least four alternately P conducting and N conducting layers, the two outer layers comprising emitter layers provided with main electrodes for the load current and two inner layers comprising base layers, a connection for supplying ignition current to a first of said base layers in a major surface of the thyristor, an auxiliary contact applied to a peripheral zone of said base layer at said major surface, at least one auxiliary thyristor formed on the semiconductor body at said major surface between said auxiliary contact and said connection for supplying ignition current, one main electrode of the auxiliary thyristor being directly connected to said connection for supplying ignition current of the main thyristor, said auxiliary contact being directly connected to the auxiliary thyristor''s connection for supplying ignition current, thereby turning on the auxiliary thyristor which tHen supplies ignition current for the main thyristor.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |