Patent US3641423A successfully refreshed from Google Patents.
US3641423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-drop voltage regulator
Assignee: Bendix Corp
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Filing: 1970-11-16
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Granted: 1972-02-08
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Expires: 1990-11-16
Abstract
Abstract A follower amplifier which connects a variable and noisy power source to a load obtains its reference from a divider composed of two serially connected transistors using feedback to obtain two widely different ratios of dynamic resistance to average resistance.
Inventors
- 👤 Reuben Laverne Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:30
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
In a voltage regulator receiving input power from a power supply having first and second terminals, an output terminal, a first current-limiting circuit having a ratio of dynamic resistance to average resistance large compared to unity connected between said first and output terminals, and a potential-limiting circuit having a ratio of dynamic resistance to average resIstance small compared to unity connected between said output terminal and said second terminal, an improvement wherein said first current-limiting circuit comprises: a resistor; a first transistor having an emitter electrode connected through said resistor to said first terminal, a collector electrode connected to said output terminal, and a control electrode; means providing a first constant potential drop connected between said first terminal and said first transistor control electrode; and wherein said potential-limiting circuit comprises: a second transistor having an emitter electrode connected to said second terminal, a collector electrode connected to said output terminal, and a control electrode; and, means providing a second constant potential drop connected between said output terminal and said second transistor control electrode.
Claim 2
Dependent Claim
173 words
In a voltage regulator receiving input power from a power supply having first and second terminals, an output terminal, a first current-limiting circuit having a ratio of dynamic resistance to average resistance large compared to unity connected between said first and output terminals, and a potential-limiting circuit having a ratio of dynamic resistance to average resIstance small compared to unity connected between said output terminal and said second terminal, an improvement wherein said first current-limiting circuit comprises: a resistor; a first transistor having an emitter electrode connected through said resistor to said first terminal, a collector electrode connected to said output terminal, and a control electrode; means providing a first constant potential drop connected between said first terminal and said first transistor control electrode; and wherein said potential-limiting circuit comprises: a second transistor having an emitter electrode connected to said second terminal, a collector electrode connected to said output terminal, and a control electrode; and, means providing a second constant potential drop connected between said output terminal and said second transistor control electrode.
Claim 3
Dependent Claim
20 words
The improvement recited in claim 1 wherein said means providing said first and second constant potential drops are semiconductor diodes.
Claim 4
Dependent Claim
19 words
The improvement recited in claim 2 with an additional resistor connected between said second transistor emitter and control electrodes.
Claim 5
Dependent Claim
65 words
The improvement recited in claim 1 wherein said means for providing a first constant potential drop comprises: a second current-limiting means; a third transistor having an emitter electrode connected to said first terminal, a collector electrode connected to the control electrode of said first transistor, and a control electrode; and, means providing a constant potential difference connected between said third transistor control and collector electrodes.
Claim 6
Dependent Claim
19 words
The improvement recited in claim 4 with an additional resistor connected between said third transistor emitter and control electrodes.
Claim 7
Dependent Claim
54 words
The improvement as recited in claim 1 with additionally an emitter follower transistor having a control electrode connected to said output terminal, an emitter electrode adapted for having a load connected therefrom to said second terminal, and a collector electrode; and, means for electrically connecting said emitter follower collector electrode to said first terminal.
Claim 8
Dependent Claim
40 words
The improvement recited in claim 6 wherein said means for electrically connecting comprises means for sensing current in said emitter follower collector emitter circuit and with additionally means responsive to said sensed current for reducing voltage at said output terminal.
Claim 9
Dependent Claim
62 words
The improvement recited in claim 6 wherein said means for electrically connecting is a resistor connected between said first terminal and said emitter follower collector electrode and with additionally: a further transistor having an emitter electrode connected to said first terminal, a control electrode connected to said emitter follower collector electrode and a collector electrode connected to said second transistor control electrode.
Claim 10
Dependent Claim
88 words
The improvement recited in claim 6 wherein said means for electrically connecting is a resistor connected between said first terminal and said emitter follower collector electrode and with additionally: a further transistor having an emitter electrode connected to said first terminal, a control electrode connected to said emitter follower collector electrode and a collector electrode; and, a second further transistor having an emitter electrode connected to said second terminal, a collector electrode connected to said output terminal and a control electrode connected to said further transistor collector electrode.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |