GB1211441A - Constant current source - Google Patents

Constant current source

Info

Publication number
GB1211441A
GB1211441A GB1531968A GB1531968A GB1211441A GB 1211441 A GB1211441 A GB 1211441A GB 1531968 A GB1531968 A GB 1531968A GB 1531968 A GB1531968 A GB 1531968A GB 1211441 A GB1211441 A GB 1211441A
Authority
GB
United Kingdom
Prior art keywords
current
transistors
resistors
load
march
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
GB1531968A
Inventor
Donald Charles Herrman
Lucas John Bazin
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Publication of GB1211441A publication Critical patent/GB1211441A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic 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
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/461Regulating voltage or current wherein the variable actually regulated by the final control device is dc using an operational amplifier as final control device

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)
  • Amplifiers (AREA)
  • Details Of Television Scanning (AREA)

Abstract

1,211,441. Current stabilzers. RCA CORPORATION. March 29, 1968 [March 30, 1967], No.15319/68. Heading G3X. A load 13, e.g. the alignment coil of a television camera tube, is supplied with constant current from sources 16, 19 of opposite polarity by way of a circuit including series-connected complementary transistors 11, 12 inter-connected as shown with resistors 14, 15, 17, 18, 25 and diodes 21, 22, 23, 24, the load 13 being coupled to the junction 26 between the tranistors 11, 12; the resistors 15, 17 are variable, and their adjustable contacts are mechanically connected so that as one resistor increases in value the other decreases in like magnitude. Thus the magnitude and polarity of the current through the load 13 can be controlled by concurrently adjusting the resistors 15, 18, and this current, once established, tends to remain constant because the impedance of the current source at the point 26 is high since the current is derived from the collector electrodes of the transistors 11, 12; further, the current is stabilized against changes in in the sources 16, 19 by the inclusion of the Zener diodes 21, 24 in the base-emitter circuits of the transistors. The transistors may be of the insulated-gate field-effect type.
GB1531968A 1967-03-30 1968-03-29 Constant current source Expired GB1211441A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62711067A 1967-03-30 1967-03-30

Publications (1)

Publication Number Publication Date
GB1211441A true GB1211441A (en) 1970-11-04

Family

ID=24513219

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1531968A Expired GB1211441A (en) 1967-03-30 1968-03-29 Constant current source

Country Status (5)

Country Link
US (1) US3518457A (en)
DE (1) DE1763031B2 (en)
FR (1) FR1565740A (en)
GB (1) GB1211441A (en)
NL (1) NL6804457A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703678A (en) * 1971-05-12 1972-11-21 Bell Telephone Labor Inc Isolating power supply
US4145649A (en) * 1976-02-19 1979-03-20 Systron-Donner Corporation Amplitude insensitive voltage-to-current converter and method for conversion
US4158224A (en) * 1977-11-21 1979-06-12 Unilog Systems Corporation Inverter apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114872A (en) * 1961-12-29 1963-12-17 Gen Electric Constant current source
US3263093A (en) * 1963-10-02 1966-07-26 Honeywell Inc Ramp generator employing constant current sink means controlling capacitor charging current from constant current source
US3363191A (en) * 1964-11-23 1968-01-09 Western Union Telegraph Co Data transmission amplifier
US3402353A (en) * 1965-07-14 1968-09-17 E H Res Lab Inc Trapezoidal pulse generator with diode bridge for switching independent current sources

Also Published As

Publication number Publication date
FR1565740A (en) 1969-05-02
DE1763031A1 (en) 1971-07-22
US3518457A (en) 1970-06-30
NL6804457A (en) 1968-10-01
DE1763031B2 (en) 1973-11-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees