US3679961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buffer amplifier and voltage regulating circuit
Assignee: RAMSEY CONTROLS Inc
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Filing: 1971-07-07
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Granted: 1972-07-25
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Expires: 1991-07-07
Abstract
Abstract A circuit for providing a D.C. voltage output equal to the D.C. voltage input regardless of the output load while giving current amplification. An emitter follower circuit in conjunction with an output diode is utilized to regulate the output voltage. The circuit also protects against overload and short circuit conditions, as well as suppressing spurious oscillations.
Inventors
- 👤 David C Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:21
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/302; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/573; H03F1/52; H03F3/00; H03F3/50; H03F2203/00; H03F2203/50; H03F2203/5012; H03F2203/5021; H03F2203/5036; H03F2203/5045; Y; Y10; Y10S; Y10S323/00; Y10S323/908
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
In a current amplifier having a D.C. voltage input and a D.C. voltage output, improved means for regulating said output voltage to be equal to said input voltage, comprising: a. first transistor means; b. means for applying said input voltage to said first transistor means so as to cause it to conduct; c. first resistance means connected to said first transistor means having a voltage drop equal to said input voltage less the voltage drop through a PN junction of said first transistor means; d. second resistance means; e. means for causing current flow through said second resistance means when said first transistor means conducts; and f. diode means connected between said first resistance means and said second resistance means for modifying said current flow, so that the voltage drop across said second resistance means is equal to said input voltage.
Claim 2
Dependent Claim
141 words
In a current amplifier having a D.C. voltage input and a D.C. voltage output, improved means for regulating said output voltage to be equal to said input voltage, comprising: a. first transistor means; b. means for applying said input voltage to said first transistor means so as to cause it to conduct; c. first resistance means connected to said first transistor means having a voltage drop equal to said input voltage less the voltage drop through a PN junction of said first transistor means; d. second resistance means; e. means for causing current flow through said second resistance means when said first transistor means conducts; and f. diode means connected between said first resistance means and said second resistance means for modifying said current flow, so that the voltage drop across said second resistance means is equal to said input voltage.
Claim 3
Dependent Claim
18 words
The combination set forth in claim 1 wherein said first transistor means is connected as an emitter follower.
Claim 4
Dependent Claim
33 words
The combination set forth in claim 2 wherein said means for causing current flow comprises a second transistor means, the base of which is connected to the collector of said first transistor means.
Claim 5
Dependent Claim
30 words
The combination set forth in claim 3 wherein said second resistance means is connected to the collector of said second transistor means and to the anode of said diode means.
Claim 6
Dependent Claim
14 words
The combination set forth in claim 1 further including means for suppressing parasitic oscillations.
Claim 7
Dependent Claim
28 words
The combination set forth in claim 5 wherein said suppressing means comprises resistance and capacitance means for slowing down the rate at which said current flow is modified.
Claim 8
Dependent Claim
21 words
The combination set forth in claim 1 further including means for protecting against excessive load currents through said second resistance means.
Claim 9
Dependent Claim
42 words
The combination set forth in claim 7 wherein said protecting means comprises resistance means connected in series with the emitter base circuit of said second transistor means and unilateral switching means connected in parallel with said series connected resistance and emitter-base 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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |