GB1240231A - Current feed device for electric lamps - Google Patents

Current feed device for electric lamps

Info

Publication number
GB1240231A
GB1240231A GB20046/69A GB2004669A GB1240231A GB 1240231 A GB1240231 A GB 1240231A GB 20046/69 A GB20046/69 A GB 20046/69A GB 2004669 A GB2004669 A GB 2004669A GB 1240231 A GB1240231 A GB 1240231A
Authority
GB
United Kingdom
Prior art keywords
lamps
electric lamps
feed device
current feed
april
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
GB20046/69A
Inventor
Lars-Erik Skagerlund
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.)
Saab Bofors AB
Original Assignee
Bofors AB
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 Bofors AB filed Critical Bofors AB
Publication of GB1240231A publication Critical patent/GB1240231A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0017—Visual time or date indication means in which the light emitting display elements may be activated at will or are controlled in accordance with the ambient light
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/155—Coordinated control of two or more light sources

Abstract

1,240,231. Supply circuits for electric lamps. BOFORS A.B. 18 April, 1969 [18 April, 1968], No. 20046/69. Heading H2H. A lighting system, e.g. for a digital display comprises a number of lamps which may be illuminated in any desired combination. The lamps 12-18 are connected in series with each other and with a constant current device across a D.C. source 9, 10. The constant current device comprises a resistor 29 and a transistor 11, the base of which is connected to a potentiometer 20. In parallel with each lamp, there is connected the collector-emitter path of a transistor 22-28, the base voltage of which is controlled, so that the corresponding lamp may be shortcircuited, the current through the other lamps remaining constant. The transistors 22-28 may be replaced by relays or other switching devices.
GB20046/69A 1968-04-18 1969-04-18 Current feed device for electric lamps Expired GB1240231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE5207/68A SE309327B (en) 1968-04-18 1968-04-18

Publications (1)

Publication Number Publication Date
GB1240231A true GB1240231A (en) 1971-07-21

Family

ID=20265928

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20046/69A Expired GB1240231A (en) 1968-04-18 1969-04-18 Current feed device for electric lamps

Country Status (5)

Country Link
CH (1) CH489077A (en)
DE (1) DE1918994A1 (en)
GB (1) GB1240231A (en)
NO (1) NO121509B (en)
SE (1) SE309327B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240105A1 (en) * 1972-08-16 1974-02-21 Nordmende CIRCUIT ARRANGEMENT FOR A LIGHT DISPLAY WITH A STRUCTURE SIMILAR TO THERMOMETER SCALE
DE3011126A1 (en) * 1980-03-22 1981-10-01 Hartmann & Braun Ag, 6000 Frankfurt Power supply for controllable LED indicators - has Zener diode stabilisation and parallel current by=pass resistor
DE3605658A1 (en) * 1986-02-21 1987-08-27 Diehl Gmbh & Co ELECTRONIC SWITCHGEAR
DE3632741A1 (en) * 1986-09-26 1988-03-31 Stahl R Schaltgeraete Gmbh Explosion-protected display arrangement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602115B1 (en) * 1986-07-24 1988-10-28 Estival Herve DEVICE FOR THE PARTICULAR CONNECTION OF INCANDESCENT LAMPS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240105A1 (en) * 1972-08-16 1974-02-21 Nordmende CIRCUIT ARRANGEMENT FOR A LIGHT DISPLAY WITH A STRUCTURE SIMILAR TO THERMOMETER SCALE
DE3011126A1 (en) * 1980-03-22 1981-10-01 Hartmann & Braun Ag, 6000 Frankfurt Power supply for controllable LED indicators - has Zener diode stabilisation and parallel current by=pass resistor
DE3605658A1 (en) * 1986-02-21 1987-08-27 Diehl Gmbh & Co ELECTRONIC SWITCHGEAR
GB2187345A (en) * 1986-02-21 1987-09-03 Diehl Gmbh & Co Electronic switchgear
DE3632741A1 (en) * 1986-09-26 1988-03-31 Stahl R Schaltgeraete Gmbh Explosion-protected display arrangement

Also Published As

Publication number Publication date
DE1918994A1 (en) 1969-11-06
NO121509B (en) 1971-03-08
SE309327B (en) 1969-03-17
CH489077A (en) 1970-04-15

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