GB1012980A - D.c. voltage control with load current limitations - Google Patents

D.c. voltage control with load current limitations

Info

Publication number
GB1012980A
GB1012980A GB3222064A GB3222064A GB1012980A GB 1012980 A GB1012980 A GB 1012980A GB 3222064 A GB3222064 A GB 3222064A GB 3222064 A GB3222064 A GB 3222064A GB 1012980 A GB1012980 A GB 1012980A
Authority
GB
United Kingdom
Prior art keywords
transistor
voltage
zener diode
load current
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
Application number
GB3222064A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1012980A publication Critical patent/GB1012980A/en
Expired legal-status Critical Current

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
    • G05F1/565—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
    • G05F1/5735—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector with foldback current limiting

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

1,012,980. Automatic voltage controL STANDARD TELEPHONES & CABLES Ltd. Aug 7, 1964 [Aug 9, 1963], No. 32220/64. Heading G3R. A D.C. voltage regulator comprises input terminals Ue, 0; output terminals Ua, 0; a regulating transistor TS and a resistor R1 connected in series between terminals Ue and Ua; a voltage divider constituted by Zener diode Z1 and resistors R3, R2 which shunts the collector-emitter path of the transistor TS; a resistor R4 and a Zener diode Z2 connected in series between the junction of R2, R3 and the terminal Ua; a control voltage source Ur for controlling transistor TS in known manner in dependence upon output voltage variations; and a circuit including transistors T1, T2, resistors R5 to R8, and an auxiliary voltage source Uh associated as shown with transistor TS and control source Ur. In normal operation Zener diode Z1 is blocked and transistors T1, T2 are non-conductive; when the load current increases to a maximum permissible value, T1 is rendered conductive by the voltage drop across resister R1 whereby transistor T2 conducts to limit the control voltage Ur in such a way that transistor TS is controlled so that the load current is maintained constant. In consequence the collector-emitter voltage of transistor TS increases until first the Zener diode Z1 and then the Zener diode Z2 conducts to affect transistor T1, the arrangement being such that the transistor TS is controlled so that the curve of the function of its collector current as dependent on the collectoremitter voltage corresponds approximately to the hyperbolic curve of the permissible power loss of the transistor TS (Fig. 1, not shown). The circuit is thus protected both against overload and against excessive power dissipation in the regulating transistor TS.
GB3222064A 1963-08-09 1964-08-07 D.c. voltage control with load current limitations Expired GB1012980A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1963ST020970 DE1297191B (en) 1963-08-09 1963-08-09 DC voltage regulator with load current limitation

Publications (1)

Publication Number Publication Date
GB1012980A true GB1012980A (en) 1965-12-15

Family

ID=7458787

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3222064A Expired GB1012980A (en) 1963-08-09 1964-08-07 D.c. voltage control with load current limitations

Country Status (3)

Country Link
CH (1) CH410134A (en)
DE (1) DE1297191B (en)
GB (1) GB1012980A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495537A (en) * 1983-05-10 1985-01-22 Harris Corporation Controlled current limiter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764829A (en) * 1972-06-09 1973-10-09 Motorola Inc Adaptive transistor switch

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE564184A (en) * 1957-01-23
US2942174A (en) * 1957-03-18 1960-06-21 Harrison Charles William Regulated voltage supply
US2904742A (en) * 1957-09-16 1959-09-15 Bell Telephone Labor Inc Current supply apparatus
US2981884A (en) * 1958-12-03 1961-04-25 Harrison Lab Inc Regulated voltage supply
US3040235A (en) * 1959-12-02 1962-06-19 Bell Telephone Labor Inc Current supply system
DE1152480B (en) * 1962-08-16 1963-08-08 Telefunken Patent Electronic fuse for a stabilized power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495537A (en) * 1983-05-10 1985-01-22 Harris Corporation Controlled current limiter

Also Published As

Publication number Publication date
CH410134A (en) 1966-03-31
DE1297191B (en) 1969-06-12

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