GB726654A - Improvements in or relating to electric circuit arrangements for varying the brightness of electric lamps - Google Patents
Improvements in or relating to electric circuit arrangements for varying the brightness of electric lampsInfo
- Publication number
- GB726654A GB726654A GB2925150A GB2925150A GB726654A GB 726654 A GB726654 A GB 726654A GB 2925150 A GB2925150 A GB 2925150A GB 2925150 A GB2925150 A GB 2925150A GB 726654 A GB726654 A GB 726654A
- Authority
- GB
- United Kingdom
- Prior art keywords
- winding
- lamp
- transductor
- transformer
- lamps
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
- B65H35/0006—Article or web delivery apparatus incorporating cutting or line-perforating devices
- B65H35/006—Article or web delivery apparatus incorporating cutting or line-perforating devices with means for delivering a predetermined length of tape
- B65H35/0066—Article or web delivery apparatus incorporating cutting or line-perforating devices with means for delivering a predetermined length of tape this length being adjustable
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
726,654. Control systems for lamps. GENERAL ELECTRIC CO., Ltd., and WILLIAMS, C. E. Nov. 28, 1951 [Nov. 29, 1950], No. 29251/50. Class 38 (4). [Also in Group XXXIX] An electric circuit arrangement for operating and dimming one or more lamps, particularly, but not exclusively, low-pressure discharge lamps, 55 ... 57, comprises a transformer 4 whose primary winding 3 is connected in series with the A.C. winding 62 of a regulating transductor 61 to A.C. supply terminals 1, 2, and connections from the primary winding or a secondary winding 10 of the transformer 4 to supply operating current to the lamp(s), said connections including, in series with the lamp(s), the A.C. winding(s) of one or more dimming transductors 58 . . . 60 and rectifying means 16 which, responsive to the flow of lamp-operating current, feeds D.C. through the D.C. winding 78 of the regulating transductor 61; this arrangement is such that, e.g., when the dimming transductors 58 ... 60 are operated to increase the lamp current, the increased D.C. output from the rectifier 16 decreases, due to core saturation, the impedance of regulating transductor A.C. winding 62, whereby to increase the voltage across the transformer 4 and hence that across the lamp-operating circuit, thereby increasing the effectiveness of the dimming transductors. As shown, the lamp electrodes 69 ... 74 are supplied with heating current by secondary windings 63 ... 68 associated with the regulating transductor A.C. winding 62 whereby increasing lamp current results in decreasing output from such secondary windings. In other embodiments, the electrode heating windings are wound on the main transformer 4, or on a separate transformer whose primary winding is made lamp current responsive by a separate transductor, or on a separate transductor which is itself similarly responsive. The invention is also applicable to a plurality of series-connected lamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2925150A GB726654A (en) | 1950-11-29 | 1950-11-29 | Improvements in or relating to electric circuit arrangements for varying the brightness of electric lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2925150A GB726654A (en) | 1950-11-29 | 1950-11-29 | Improvements in or relating to electric circuit arrangements for varying the brightness of electric lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB726654A true GB726654A (en) | 1955-03-23 |
Family
ID=10288546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2925150A Expired GB726654A (en) | 1950-11-29 | 1950-11-29 | Improvements in or relating to electric circuit arrangements for varying the brightness of electric lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB726654A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0390285A2 (en) * | 1989-03-28 | 1990-10-03 | Matsushita Electric Works, Ltd. | Discharge lamp lighting device |
-
1950
- 1950-11-29 GB GB2925150A patent/GB726654A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0390285A2 (en) * | 1989-03-28 | 1990-10-03 | Matsushita Electric Works, Ltd. | Discharge lamp lighting device |
| EP0390285A3 (en) * | 1989-03-28 | 1993-02-24 | Matsushita Electric Works, Ltd. | Discharge lamp lighting device |
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