US3714549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensation circuit for a regulated power supply
Assignee: Design Elements Inc
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Filing: 1972-04-20
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Granted: 1973-01-30
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Expires: 1992-04-20
Abstract
Abstract A temperature compensation circuit for stabilizing the output voltage of a regulated power supply. The regulator includes an output-shunting zener diode and a feedback transistor for controlling the regulator. The compensation circuit has a Darlington pair connected to the feedback transistor to form a differential amplifier. An adjustable voltage divider, connected across the regulated output, maintains a constant voltage on the input of the Darlington pair.
Inventors
- 👤 E Mason
- 👤 R Libby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/567
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A temperature compensation circuit for use in a regulated power supply of the type having a series zener diode and first resistance shunted across its regulated output and having a regulator feedback transistor with its input control terminal connected between said zener diode and said first resistance, said circuit comprising: a. voltage reference resistance connected between an output of said feedback transistor and the end of said first resistance opposite said zener diode; b. a plurality of darlington connected transistors having their outputs connected to said reference resistance and said regulated power supply for supplying a controlled current through the reference resistance; and c. a plurality of series connected voltage dividing resistances connected across said regulated supply having the input terminal of said darlington connected transistors connected to a node thereof.
Claim 2
Dependent Claim
131 words
A temperature compensation circuit for use in a regulated power supply of the type having a series zener diode and first resistance shunted across its regulated output and having a regulator feedback transistor with its input control terminal connected between said zener diode and said first resistance, said circuit comprising: a. voltage reference resistance connected between an output of said feedback transistor and the end of said first resistance opposite said zener diode; b. a plurality of darlington connected transistors having their outputs connected to said reference resistance and said regulated power supply for supplying a controlled current through the reference resistance; and c. a plurality of series connected voltage dividing resistances connected across said regulated supply having the input terminal of said darlington connected transistors connected to a node thereof.
Claim 3
Dependent Claim
131 words
A temperature compensation circuit for use in a regulated power supply of the type having a series zener diode and first resistance shunted across its regulated output and having a regulator feedback transistor with its input control terminal connected between said zener diode and said first resistance, said circuit comprising: a. voltage reference resistance connected between an output of said feedback transistor and the end of said first resistance opposite said zener diode; b. a plurality of darlington connected transistors having their outputs connected to said reference resistance and said regulated power supply for supplying a controlled current through the reference resistance; and c. a plurality of series connected voltage dividing resistances connected across said regulated supply having the input terminal of said darlington connected transistors connected to a node thereof.
Claim 4
Dependent Claim
131 words
A temperature compensation circuit for use in a regulated power supply of the type having a series zener diode and first resistance shunted across its regulated output and having a regulator feedback transistor with its input control terminal connected between said zener diode and said first resistance, said circuit comprising: a. voltage reference resistance connected between an output of said feedback transistor and the end of said first resistance opposite said zener diode; b. a plurality of darlington connected transistors having their outputs connected to said reference resistance and said regulated power supply for supplying a controlled current through the reference resistance; and c. a plurality of series connected voltage dividing resistances connected across said regulated supply having the input terminal of said darlington connected transistors connected to a node thereof.
Claim 5
Dependent Claim
30 words
A circuit according to claim 1 wherein said feedback transistor has a base as its control input, and the reference resistor is connected to an emitter of said feedback transistor.
Claim 6
Dependent Claim
67 words
A circuit according to claim 2 wherein said darlington connected transistors comprise a darlington pair having its base input connected to said voltage dividing resistances, having a second resistance connecting its emitter output to said reference resistance for forming a voltage divider and having a third resistance connecting its collector output to the regulated power supply output terminal for minimizing power dissipation variations in said darlington pair.
Claim 7
Dependent Claim
26 words
A circuit according to claim 3 wherein a first capacitor is shunted across said reference resistance for minimizing the response of said circuit to ac variations.
Claim 8
Dependent Claim
25 words
A circuit according to claim 4 wherein a second capacitance is connected between said darlington pair input and said opposite side of said first resistance.
Claim 9
Dependent Claim
26 words
A circuit according to claim 3 wherein said voltage dividing resistances include a manually variable resistance for adjusting the output voltage of said regulated power supply.
References Cited (Backward Citations)
US3025451A
Cited
US3681623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |