GB1240231A - Current feed device for electric lamps - Google Patents
Current feed device for electric lampsInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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.
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)
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)
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 |
-
1968
- 1968-04-18 SE SE5207/68A patent/SE309327B/xx unknown
-
1969
- 1969-04-14 NO NO1511/69A patent/NO121509B/no unknown
- 1969-04-15 DE DE19691918994 patent/DE1918994A1/en active Pending
- 1969-04-18 GB GB20046/69A patent/GB1240231A/en not_active Expired
- 1969-04-18 CH CH592069A patent/CH489077A/en not_active IP Right Cessation
Cited By (5)
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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