GB1344620A - Electroluminescent devices - Google Patents

Electroluminescent devices

Info

Publication number
GB1344620A
GB1344620A GB1344620DA GB1344620A GB 1344620 A GB1344620 A GB 1344620A GB 1344620D A GB1344620D A GB 1344620DA GB 1344620 A GB1344620 A GB 1344620A
Authority
GB
United Kingdom
Prior art keywords
transistor
current
electroluminescent
output
variation
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
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.)
Werring N J
Original Assignee
Werring N J
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 Werring N J filed Critical Werring N J
Publication of GB1344620A publication Critical patent/GB1344620A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/22—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident light

Landscapes

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

Abstract

1344620 Automatic control of electroluminescent devices P HAWKINS and N J WERRING 3 Sept 1971 [10 June 1970] 28031/70 Headings G3R and G3X A direct current electroluminescent device is connected in circut with an element which detects any variation in the operating conditions of the device and varies the current through the device so as to stabilize its output. In a first embodiment, Fig. 1, a transistor 12 receives constant base current from a negative line 16 by way of resistors R1, R2. Changes in the resistance of the electroluminescent device 10 result in variation of the voltage across the transistor such that the current flowing in the device 10 is adjusted to maintain the power dissipated in the device at a constant level. In a second embodiment, Fig. 2, a photo-cell 24 senses the output from the electroluminescent device 20, and controls the bias of transistor 22 so as to maintain the light output constant. In both embodiments, the transistor may be replaced by a thermionic valve or a magnetic amplifier.
GB1344620D 1970-06-10 1970-06-10 Electroluminescent devices Expired GB1344620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2803170 1970-06-10

Publications (1)

Publication Number Publication Date
GB1344620A true GB1344620A (en) 1974-01-23

Family

ID=10269149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1344620D Expired GB1344620A (en) 1970-06-10 1970-06-10 Electroluminescent devices

Country Status (1)

Country Link
GB (1) GB1344620A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2353198A1 (en) * 1976-05-25 1977-12-23 Fujitsu Ltd PHOTO-EMISSIONS CONTROL DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2353198A1 (en) * 1976-05-25 1977-12-23 Fujitsu Ltd PHOTO-EMISSIONS CONTROL DEVICE

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PLE Entries relating assignments, transmissions, licences in the register of patents
PE20 Patent expired after termination of 20 years