US5105145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control circuit
Assignee: Robert Bosch GmbH
•
Filing: 1988-05-04
•
Granted: 1992-04-14
•
Expires: 2008-05-04
Abstract
Abstract To stop high-voltage breakdown of a transistor (T1) in an amplifier circuit, a selectively conducting means, e.g. a diode (D), provides a low resistance path in response to a switching or control transistor (T8). Upon initiation of breakdown, the diode (D) conducts to block transistor (T1) and prevent damage thereto. The transistor (T1) is part of a multi-stage output amplifier (12) connected to an input differential amplifier (11). The output voltage is back to a transistor of the input amplifier (T7). The diode (D) may be replaced by a transistor (T, FIG. 2).
Inventors
- 👤 Wolfram Neth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:00
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0812; H03K17/08126; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/571; H03F; H03F1/00; H03F1/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
A voltage control circuit (10, 20) including an amplifier, said amplifier comprising: a first transistor (T1) having a base, emitter and collector and a collector-emitter path, and the collector-emitter path of the first transistor being connected between a first reference potential (U V ) and, via a resistive element (R1), a second reference potential (G); a second transistor (T2) having a base, a collector, an emitter and a collector-emitter path; a selectively conducting circuit means (D, T) responsive to a controlling circuit means (T8) for providing conduction between said first transistor (T1) and said second reference potential (G), and said selective conducting circuit means (D, T) having two terminals, an output terminal connected to the emitter of the first transistor (T1) form which the output voltage (U A ) is drawn; and wherein one of the terminals of the selectively conducting circuit means (D, T) is connected to the base of said first transistor (T1) and to the collector-emitter path of said second transistor (T2), and the other terminal of said selectively conducting circuit means is connected to said second reference potential (G).
Claim 2
Dependent Claim
183 words
A voltage control circuit (10, 20) including an amplifier, said amplifier comprising: a first transistor (T1) having a base, emitter and collector and a collector-emitter path, and the collector-emitter path of the first transistor being connected between a first reference potential (U V ) and, via a resistive element (R1), a second reference potential (G); a second transistor (T2) having a base, a collector, an emitter and a collector-emitter path; a selectively conducting circuit means (D, T) responsive to a controlling circuit means (T8) for providing conduction between said first transistor (T1) and said second reference potential (G), and said selective conducting circuit means (D, T) having two terminals, an output terminal connected to the emitter of the first transistor (T1) form which the output voltage (U A ) is drawn; and wherein one of the terminals of the selectively conducting circuit means (D, T) is connected to the base of said first transistor (T1) and to the collector-emitter path of said second transistor (T2), and the other terminal of said selectively conducting circuit means is connected to said second reference potential (G).
Claim 3
Dependent Claim
30 words
A voltage control circuit according to claim 1, wherein the selectively conducting means (D, T) is connected between the reference potential (G) and the base of said first transistor (T1).
Claim 4
Dependent Claim
18 words
A voltage control circuit according to claim 1, wherein said controlling circuit means comprises a control transistor (T8).
Claim 5
Dependent Claim
65 words
A voltage control circuit according to claim 3, further comprising another amplifier acting as an input amplifier connected to said amplifier, said amplifier acting as an output amplifier, said other amplifier having a transistor (T7) having a base, an emitter and a collector, wherein said first and second transistors (T1, T2) and said switching or controlling circuit means (T8) are parts of said output amplifier.
Claim 6
Dependent Claim
35 words
A voltage control circuit according to claim 4, wherein the input amplifier is a differential amplifier (T6, T7, T9, T10, T4, T5, S) and the output amplifier is a multi-stage amplifier (T8, T3, T2, T1).
Claim 7
Dependent Claim
31 words
A voltage control circuit according to claim 5, wherein a negative feedback connection is provided between the output terminal of the output amplifier and the transistor (T7) of the input amplifier.
Claim 8
Dependent Claim
33 words
A voltage control circuit according to claim 6, wherein the resistor (R1) is connected to the output terminal of the output amplifier and the base of the transistor (T7) in the input amplifier.
Claim 9
Dependent Claim
18 words
A voltage control circuit according to claim 1, wherein the selectively conducting circuit means is a diode (D).
Claim 10
Dependent Claim
18 words
A voltage control circuit according to claim 1, wherein the selectively conducting circuit means is a transistor (T).
References Cited (Backward Citations)
US3569849A
Cited
US4857862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-14 | 1995-10-14 | 1996-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-14 | 1999-10-14 | 2000-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-14 | 2003-10-14 | 2004-04-14 | $7700.00 | Window Closed / Lapsed |