GB1250243A - - Google Patents
Info
- Publication number
- GB1250243A GB1250243A GB1250243DA GB1250243A GB 1250243 A GB1250243 A GB 1250243A GB 1250243D A GB1250243D A GB 1250243DA GB 1250243 A GB1250243 A GB 1250243A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- voltage
- divider
- temperature
- circuit
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers
-
- 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
- G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
- G05F1/463—Sources providing an output which depends on temperature
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/18—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using Zener diodes
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Amplifiers (AREA)
- Networks Using Active Elements (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
1,250,243. Automatic voltage regulation; automatic control systems. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. May 14, 1969 [May 17, 1968], No. 24530/69. Headings G3R and G3X. An electrical circuit for generating a temperature-dependent output voltage and having an overall temperature co-efficient of resistance based on a resistive network and a transistor, comprises a resistive voltage divider forming at least part of the network and being in parallel with the emitter-collector path of the transistor whose base is connected to the divider tapping, and a circuit path incorporated in the network which path is of substantially zero temperature co-efficient and includes at least one Zener diode connected for reverse conduction, the output voltage being derived from the emitter-collector path of the transistor as a function of the collector current, and the circuit operation being such that the tapping connection determines the temperature co-efficient substantially independently of the circuit supply voltage. The embodiment shown in Fig. 3 is derived from a known circuit, Fig. 1 (not shown) in which the part of the voltage divider connected between the emitter and base of the transistor has a value smaller than that of the baseemitter input impedance of the transistor, and the current through the whole of the divider is less than the collector current of the transistor. The circuit of Fig. 3 retains the aforementioned features and is independent of the supply voltage Vs by virtue of the components 7, 8, 9, 9<SP>1</SP> added to the known circuit comprising members 1, 2, 3. Zener diode 7 has a temperature co-efficient which is substantially zero and a Zener voltage which is at least equal to the desired range of variation of the voltage Vs. If one Zener diode cannot provide both these requirements, a combination of one or several Zener diodes in series with one or several diodes connected in the forward direction may be used. By suitable choice of the values of resistor 8 and divider 9, 9<SP>1</SP>, it is shown by a theoretical analysis of the circuit that the temperature coefficient is dependent on the ratio of resistors 2, 3 and on the temperature co-efficient of the internal base-emitter resistance of the transistor 1. Resistor 8 may be omitted and the parallel circuit 7, 9, 91 connected between divider members 2, 3, the transistor base being connected to the tapping of divider 9, 9<SP>1</SP>, Fig. 4 (not shown). In this modification the working point of the transistor 1 is determined by the divider 9, 9<SP>1</SP>, but if it is not necessary for the collector current of transistor 1 to be variable the divider 9, 9<SP>1</SP> may be omitted and members 2, 3 may be in series with the Zener diode(s) and diode(s) with their tapping once again connected to the base of the transistor, Fig. 5 (not shown). The emitter-collector voltage of transistor 1 or the voltage across the resistor 6 may be used as a temperature dependent control signal for a control system for a temperature dependent element supplied by the voltage Vs, so that the controlled parameter of the element is maintained constant irrespective of temperature variations. Application of the invention to the circuits and control systems of Specification 1, 093, 316 is envisaged.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6806969A NL6806969A (en) | 1968-05-17 | 1968-05-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1250243A true GB1250243A (en) | 1971-10-20 |
Family
ID=19803660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1250243D Expired GB1250243A (en) | 1968-05-17 | 1969-05-14 |
Country Status (7)
Country | Link |
---|---|
US (1) | US3638049A (en) |
BE (1) | BE733209A (en) |
DE (1) | DE1920232B2 (en) |
ES (1) | ES367232A1 (en) |
FR (1) | FR2008765A1 (en) |
GB (1) | GB1250243A (en) |
NL (1) | NL6806969A (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3916263A (en) * | 1971-12-13 | 1975-10-28 | Honeywell Inf Systems | Memory driver circuit with thermal protection |
CA995483A (en) * | 1973-02-16 | 1976-08-24 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Transistor anemometer |
DE3171674D1 (en) * | 1980-04-28 | 1985-09-12 | Fujitsu Ltd | Temperature compensating voltage generator circuit |
DE3019162C2 (en) * | 1980-05-20 | 1985-11-07 | Telefunken electronic GmbH, 7100 Heilbronn | Transistor ignition circuit |
DE3135974A1 (en) * | 1981-09-08 | 1983-03-17 | Siemens AG, 1000 Berlin und 8000 München | CIRCUIT ARRANGEMENT WITH A TRANSMITTER, ESPECIALLY WITH A SEMICONDUCTOR PRESSURE SENSOR |
US4736126A (en) * | 1986-12-24 | 1988-04-05 | Motorola Inc. | Trimmable current source |
US5099381A (en) * | 1989-11-08 | 1992-03-24 | National Semiconductor Corporation | Enable circuit with embedded thermal turn-off |
JPH06510149A (en) * | 1991-08-21 | 1994-11-10 | アナログ・デバイセズ・インコーポレイテッド | Temperature compensation method for Zener diode with positive and negative temperature coefficients |
US7132185B2 (en) * | 2001-12-14 | 2006-11-07 | Ballard Power Systems Inc. | Fuel cell system shunt regulator method and apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3214706A (en) * | 1962-01-09 | 1965-10-26 | Burroughs Corp | Wide band amplifier with adjustable d.c. output level |
US3488529A (en) * | 1966-12-14 | 1970-01-06 | Sperry Rand Corp | Temperature sensing current source |
-
1968
- 1968-05-17 NL NL6806969A patent/NL6806969A/xx unknown
-
1969
- 1969-04-22 DE DE19691920232 patent/DE1920232B2/en not_active Ceased
- 1969-05-14 GB GB1250243D patent/GB1250243A/en not_active Expired
- 1969-05-14 ES ES367232A patent/ES367232A1/en not_active Expired
- 1969-05-14 FR FR6915792A patent/FR2008765A1/fr not_active Withdrawn
- 1969-05-16 BE BE733209D patent/BE733209A/xx unknown
- 1969-05-19 US US825825A patent/US3638049A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
NL6806969A (en) | 1969-05-27 |
DE1920232A1 (en) | 1970-09-24 |
FR2008765A1 (en) | 1970-01-23 |
DE1920232B2 (en) | 1976-06-10 |
US3638049A (en) | 1972-01-25 |
BE733209A (en) | 1969-11-17 |
ES367232A1 (en) | 1971-04-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |