US3704381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High stability current regulator controlling high current source with lesser stability
Assignee: Forbro Design Corp
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Filing: 1971-09-02
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Granted: 1972-11-28
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Expires: 1991-09-02
Abstract
Abstract Two current regulated power supplies are connected across a common load impedance. A first regulated power supply having high stability characteristics is connected in a conventional feedback manner to regulate current to the load. A second feedback power supply having lesser stability characteristics than the first but greater output current capabilities is connected to null the sum of opposing voltage drops, one across a current sensing resistor in series with the first power supply and the load and the other in series with the second power supply and the load. The ratio of the resistances of the latter two resistors controls the relative current contribution of the two power supplies to the total load current.
Inventors
- 👤 Sarkis Nercessian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:02
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/59; H; H02; H02J; H02J1/00; H02J1/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
In a current regulating system, the combination of; a first (14-18) feedback regulated power supply including a common terminal (15), an output terminal and a feedback terminal (16); a first current sensing resistor (12); a second current sensing resistor (10); a current proportioning resistor (26); a pair of load terminals; a first series circuit comprising said first current sensing resistor, said current proportioning resistor and said load terminals connected between said common terminal and said output terminal; a second feedback regulated power supply (1-5) including a common terminal (2), an output terminal and a feedback terminal (3); a second series circuit comprising said first (12) and second (10) current sensing resistors and said load terminals connected between said common terminal and said output terminal of said second power supply; feedback circuit means for applying the voltage drops across said first and second current sensing resistors to said feedback terminal (3) of said second power supply; and a feedback circuit including in series a gain control resistor (25) connected across said first current sensing resistor (12).
Claim 2
Dependent Claim
175 words
In a current regulating system, the combination of; a first (14-18) feedback regulated power supply including a common terminal (15), an output terminal and a feedback terminal (16); a first current sensing resistor (12); a second current sensing resistor (10); a current proportioning resistor (26); a pair of load terminals; a first series circuit comprising said first current sensing resistor, said current proportioning resistor and said load terminals connected between said common terminal and said output terminal; a second feedback regulated power supply (1-5) including a common terminal (2), an output terminal and a feedback terminal (3); a second series circuit comprising said first (12) and second (10) current sensing resistors and said load terminals connected between said common terminal and said output terminal of said second power supply; feedback circuit means for applying the voltage drops across said first and second current sensing resistors to said feedback terminal (3) of said second power supply; and a feedback circuit including in series a gain control resistor (25) connected across said first current sensing resistor (12).
Claim 3
Dependent Claim
30 words
A current regulating system as set forth in claim 1; wherein the resistance of said current proportioning sensing resistor is many times the resistance of said second current sensing resistor.
Claim 4
Dependent Claim
41 words
A current regulating system as set forth in claim 1; wherein the output circuit of said first power supply comprises a pass transistor and a source of unregulated direct current connected in series between said common terminal and said output terminal.
Claim 5
Dependent Claim
41 words
A current regulating system as set forth in claim 1; wherein the output circuit of said second power supply comprises a pass transistor and a source of unregulated direct current connected in series between said common terminal and said output terminal.
Claim 6
Dependent Claim
31 words
A current regulating system as set forth in claim 1; wherein the resistance of said current proportioning resistor is greater than 25 times the resistance of said second current sensing resistor.
Claim 7
Dependent Claim
29 words
A current regulating system as set forth in claim 1; wherein said two power supplies are poled to apply direct current across said load terminals in the same direction.
Claim 8
Dependent Claim
29 words
A current regulating system as set forth in claim 1; wherein the feedback circuit means to said first power supply feedback terminal includes an adjustable resistor in series connection.
Claim 9
Dependent Claim
37 words
A current regulating system as set forth in claim 1, and including; a source of reference voltage and a reference resistor in series connected between the common terminal and the feedback terminal of said first power supply.
References Cited (Backward Citations)
US3466455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |