Patent US4695807A successfully refreshed from Google Patents.
US4695807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement having clearing transistors for discharging a Darlington stage
Assignee: Telefunken Electronic GmbH
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Filing: 1986-03-12
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Granted: 1987-09-22
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Expires: 2006-03-12
Abstract
Abstract In a circuit arrangement with a Darlington stage, there are provided for clearing the charges of the Darlington transistors, transistors which are connected in such a way that the base current of the Darlington transistor preceding the last Darlington transistor travels in each case via the switched-through collector emitter section of a clearing transistor to the base of a following clearing transistor and actuates it.
Inventors
- 👤 Ralph Annacker
- 👤 Joachim Dietl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:36
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/615; H03K17/04; H03K17/041; H03K17/0412; H03K17/04126
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A circuit arrangement, comprising: a Darlington stage which includes a sequence of Darlington transistors; and means for removing charges during the circuit-breaking of the Darlington transistors, said means for removing the charges including a plurality of clearing transistors, means for connecting the clearing transistors in a sequence and for connecting each clearing transistor to the base of a respective Darlington transistor so that the base current of the Darlington transistors preceding the last Darlington transistor travels in each case via the switched-through collector emitter section of a clearing transistor to the base of a following clearing transistor to actuate the following clearing transistor, and a diode connected between the base of the first transistor in the sequence of Darlington transistors and the base of the first transistor in the sequence of clearing transistors.
Claim 2
Dependent Claim
133 words
A circuit arrangement, comprising: a Darlington stage which includes a sequence of Darlington transistors; and means for removing charges during the circuit-breaking of the Darlington transistors, said means for removing the charges including a plurality of clearing transistors, means for connecting the clearing transistors in a sequence and for connecting each clearing transistor to the base of a respective Darlington transistor so that the base current of the Darlington transistors preceding the last Darlington transistor travels in each case via the switched-through collector emitter section of a clearing transistor to the base of a following clearing transistor to actuate the following clearing transistor, and a diode connected between the base of the first transistor in the sequence of Darlington transistors and the base of the first transistor in the sequence of clearing transistors.
Claim 3
Dependent Claim
40 words
A circuit arrangement according to claim 1, wherein the clearing transistors preceding the last clearing transistor are in each case connected with their collector emitter section betweeen the base of a Darlington transistor and the base of a clearing transistor.
Claim 4
Dependent Claim
31 words
A circuit arrangement according to claim 1, wherein the collector emitter section of the last clearing transistor is connected between the base of the last Darlington transistor and a reference point.
Claim 5
Dependent Claim
25 words
A circuit arrangement according to claim 1, wherein the first clearing transistor exhibits a different conductivity type sequence from the other transistors of the circuit.
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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |