US4742425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple-cell transistor with base and emitter fuse links
Assignee: Robert Bosch GmbH
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Filing: 1986-08-25
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Granted: 1988-05-03
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Expires: 2006-08-25
Abstract
Abstract A multiple-cell transistor consists of a parallel connection of individual transistor cells (41, 42) for power distribution. Fuse links (6, 7), which separate the defective transistor cells from the compound in the event of a short circuit, are provided for the purpose of automatically separating defective transistor cells. A voltage-controlled switch (9) is provided for improved separation of the base fuse link (7).
Inventors
- 👤 Gerhard Conzelmann
- 👤 Karl Nagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:53
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10W20/49; H10W20/493; H10W42/00; H10W42/80
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
Multiple-cell transistor consisting of parallel connections of individual transistor cells provided between respective base, emitter and collector bus bars, wherein a fuse link (6, 7) is connected in the collector-emitter path and in the base connection of each transistor cell, comprising voltage-controlled switches for severing said fuse links in the case of defects, each of said switches being connected between a connection bar (1) and the connection point of a fuse link with said base connection, which is remote of the base.
Claim 2
Dependent Claim
82 words
Multiple-cell transistor consisting of parallel connections of individual transistor cells provided between respective base, emitter and collector bus bars, wherein a fuse link (6, 7) is connected in the collector-emitter path and in the base connection of each transistor cell, comprising voltage-controlled switches for severing said fuse links in the case of defects, each of said switches being connected between a connection bar (1) and the connection point of a fuse link with said base connection, which is remote of the base.
Claim 3
Dependent Claim
22 words
Multiple-cell transistor according to claim 1, wherein a resistor (8) is connected between said connection point and said bas bus bar (2).
Claim 4
Dependent Claim
23 words
Multiple-cell transistor according to claim 2, wherein said resistor (8) is formed by means of at least one semiconductor segment, preferably a diode.
Claim 5
Dependent Claim
18 words
Multiple-cell transistor according to claim 1, wherein each of said voltage-controlled switches is formed by a Zener diode.
Claim 6
Dependent Claim
17 words
Multiple-cell transistor according to claim 1, wherein each of said voltage-controlled switches is formed by a thyristor.
Claim 7
Dependent Claim
28 words
Multiple-cell transistor according to claim 5, wherein said thyristor is activated by means of a Zener diode which is connected to said fuse link at said connection point.
Claim 8
Dependent Claim
35 words
Multiple-cell transistor according to claim 5, wherein said thyristor is activated by means of a resistor which is connected to a component part which is dependent on the base potential of an output transistor cell.
Claim 9
Dependent Claim
22 words
Multiple-cell transistor according to claim 5, wherein said thyristor is formed by a combination of a p-n-p transistor and a n-p-n transistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |