US4459540A
Expired / Lapsed
US
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Constant voltage generating circuit
Assignee: Mitsubishi Electric Corp
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Filing: 1982-02-23
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Granted: 1984-07-10
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Expires: 2002-02-23
Abstract
Abstract A constant voltage generating circuit is designed so that the output thereof is temperature compensated. In particular, the device is provided with a first circuit containing p-n junctions (diodes, transistors etc.), the number of which is selected to compensate for any temperature dependance of a second, voltage level down or up circuit.
Inventors
- 👤 Shigekazu Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:24
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22; G05F3/222; G05F3/225; Y; Y10; Y10S; Y10S323/00; Y10S323/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A constant voltage generating circuit, comprising: a first circuit for shifting a reference voltage level to a first voltage level through p-n junction means; a second circuit for shifting said first voltage level by a voltage which is equal to the sum of an integer times a p-n junction voltage, and a predetermined voltage, to provide an output; and the number of p-n junctions in said first circuit being selected to compensate for a temperature characteristic of said second circuit.
Claim 2
Dependent Claim
80 words
A constant voltage generating circuit, comprising: a first circuit for shifting a reference voltage level to a first voltage level through p-n junction means; a second circuit for shifting said first voltage level by a voltage which is equal to the sum of an integer times a p-n junction voltage, and a predetermined voltage, to provide an output; and the number of p-n junctions in said first circuit being selected to compensate for a temperature characteristic of said second circuit.
Claim 3
Dependent Claim
36 words
A constant voltage generating circuit as claimed in claim 1, said first circuit comprising a pair of current sources, said p-n junctions arranged serially between said current sources, and a transistor supplied with said reference voltage.
Claim 4
Dependent Claim
36 words
A constant voltage generating circuit as claimed in claim 2, said reference voltage being applied to the base of said transistor, which has an emitter connected between one of said current sources and said p-n junctions.
Claim 5
Dependent Claim
25 words
A constant voltage generating circuit as claimed in claim 1, said second circuit comprising a level decreasing circuit, said first voltage level being shifted downwardly.
Claim 6
Dependent Claim
25 words
A constant voltage generating circuit as claimed in claim 1, said second circuit comprising a level increasing circuit for shifting said first voltage level upwardly.
Claim 7
Dependent Claim
24 words
A constant voltage generating circuit as claimed in claim 5, said first circuit reducing said reference voltage level to obtain said first voltage level.
Claim 8
Dependent Claim
57 words
A constant voltage generating circuit as claimed in claim 6, said first circuit comprising first and second current sources, a plurality of serially connected p-n junctions between said first and second sources, and a transistor receiving said reference voltage at a base thereof and having an emitter connected between said first current source and said p-n junctions.
Claim 9
Dependent Claim
74 words
A constant voltage generating circuit as claimed in claims 5 or 6, wherein said second circuit comprises a triad of current sources, a plurality of PNP transistors, wherein at least one of said plurality of PNP transistors is coupled in series with a respective one of said current sources, and a resistor connected between one of said current sources and one of said transistors, a voltage drop across said resistor comprising said predetermined voltage.
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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |