GB1474071A - Constant-voltage circuit - Google Patents
Constant-voltage circuitInfo
- Publication number
- GB1474071A GB1474071A GB2593274A GB2593274A GB1474071A GB 1474071 A GB1474071 A GB 1474071A GB 2593274 A GB2593274 A GB 2593274A GB 2593274 A GB2593274 A GB 2593274A GB 1474071 A GB1474071 A GB 1474071A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- voltage
- circuit
- series
- collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
1474071 Automatic voltage control HITACHI Ltd 11 June 1974 [13 June 1973] 25932/74 Heading G3R A power supply circuit, suitable for construction as an integrated circuit in a television receiver, includes a series transistor controlled by a drive transistor in response to a control signal from an output voltage sensing and error amplifying circuit. One electrode of the drive transistor is connected to the output terminal of the series transistor through a constant voltage element so as to minimize the voltage drop across the series transistor at the operating threshold of the circuit. As shown, a transistor 3 is biased by an output voltage divider 4, 5, 6 and a Zener diode 7 so as to produce an amplified error signal which is fed to the base of a drive transistor 2 which in turn controls the conduction of a series transistor 1 in order to regulate the output voltage V 0 . The collector of transistor 2 is connected to output terminal 13 by diodes 17, 18 connected in the forward direction, so that the junction of the collector of transistor 2 and a resistor 15 is maintained at a fixed voltage below the collector voltage of the series transistor 1. In this way, the lower limit of circuit operation occurs when transistor 1 saturates, minimizing the voltage drop between input terminal 11 and output terminal 13. A similar embodiment, using transistors of opposite conductivity types, is described with reference to Fig.4 (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48065945A JPS5244422B2 (en) | 1973-06-13 | 1973-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1474071A true GB1474071A (en) | 1977-05-18 |
Family
ID=13301602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2593274A Expired GB1474071A (en) | 1973-06-13 | 1974-06-11 | Constant-voltage circuit |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS5244422B2 (en) |
BR (1) | BR7404812D0 (en) |
GB (1) | GB1474071A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2325313A (en) * | 1997-05-12 | 1998-11-18 | Fulleon Ltd | Electronic circuits for removing data signals from DC supply voltage |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5242060A (en) * | 1975-09-29 | 1977-04-01 | Hitachi Ltd | Transistor invertor |
JPS5547246Y2 (en) * | 1976-05-12 | 1980-11-06 | ||
JPS52156933U (en) * | 1976-05-24 | 1977-11-29 | ||
JPS5472444A (en) * | 1977-11-18 | 1979-06-09 | Hitachi Denshi Ltd | Control of constant-voltage circuit |
FR2676689B1 (en) * | 1991-05-23 | 1994-01-07 | Leonce Rudelle | DEVICE FOR ELECTRICALLY DRIVING A ROLLING VEHICLE AND MOTOR VEHICLE EQUIPPED WITH SUCH A DEVICE. |
-
1973
- 1973-06-13 JP JP48065945A patent/JPS5244422B2/ja not_active Expired
-
1974
- 1974-06-11 GB GB2593274A patent/GB1474071A/en not_active Expired
- 1974-06-12 BR BR481274A patent/BR7404812D0/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2325313A (en) * | 1997-05-12 | 1998-11-18 | Fulleon Ltd | Electronic circuits for removing data signals from DC supply voltage |
GB2325313B (en) * | 1997-05-12 | 2001-06-13 | Fulleon Ltd | Electronic circuits |
Also Published As
Publication number | Publication date |
---|---|
BR7404812D0 (en) | 1975-01-07 |
JPS5015050A (en) | 1975-02-17 |
JPS5244422B2 (en) | 1977-11-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |