GB539465A - Improved circuit arrangements for operating electric discharge lamps - Google Patents
Improved circuit arrangements for operating electric discharge lampsInfo
- Publication number
- GB539465A GB539465A GB506640A GB506640A GB539465A GB 539465 A GB539465 A GB 539465A GB 506640 A GB506640 A GB 506640A GB 506640 A GB506640 A GB 506640A GB 539465 A GB539465 A GB 539465A
- Authority
- GB
- United Kingdom
- Prior art keywords
- elements
- discharge
- contacts
- operating
- discharge 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
- H05B41/02—Details
- H05B41/04—Starting switches
- H05B41/06—Starting switches thermal only
Landscapes
- Discharge Lamp (AREA)
Abstract
539,465. Discharge lamps. BRITISH THOMSONHOUSTON, CO., Ltd., and SCOTT, W. J. March 19, 1940, No. 5066. [Class 39 (i)] [Also in Groups XXXV and XXXVII] In a circuit for operating lowpressure discharge lamps of the type comprising thermionic filamentary cathodes which are preheated to 'initiate the discharge, the heating current being discontinued during the normal operation of the lamp, a switching arrangement is provided for putting the filamentary cathodes in circuit with the source of heating current and subsequently connecting the ends of the filaments together so that all parts thereof are at the same potential. The switch may be electromagnetically operated, or of the thermal responsive type such as described in Specification 532,490, [Group XXXVII]. The arrangement described is a glow discharge device comprising two fixed contacts 5, 6 and two bimetallic elements 3, 4 carrying contact member 7, 8. The contacts 6, 8 and 5, 7 are connected to the ends of the filamentary cathodes of a discharge lamp operating on A.C. When the operating current is first supplied, the glow discharge between the elements 3, 4 causes these elements to deflect until the contacts 7, 8 short circuit the glow discharge causing a relatively heavy heating current to pass through the filaments, and allowing the elements to cool, whereby they return to their normal position closing the contacts 6, 8 and 5, 7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB506640A GB539465A (en) | 1940-03-19 | 1940-03-19 | Improved circuit arrangements for operating electric discharge lamps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB506640A GB539465A (en) | 1940-03-19 | 1940-03-19 | Improved circuit arrangements for operating electric discharge lamps |
Publications (1)
Publication Number | Publication Date |
---|---|
GB539465A true GB539465A (en) | 1941-09-11 |
Family
ID=9789107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB506640A Expired GB539465A (en) | 1940-03-19 | 1940-03-19 | Improved circuit arrangements for operating electric discharge lamps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB539465A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2562692A (en) * | 1948-06-04 | 1951-07-31 | Air Reduction | Overvoltage protective device |
-
1940
- 1940-03-19 GB GB506640A patent/GB539465A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2562692A (en) * | 1948-06-04 | 1951-07-31 | Air Reduction | Overvoltage protective device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2235360A (en) | Thermostatic flasher lamp | |
GB533249A (en) | Improvements in or relating to electric discharge devices particularly for use in the starting circuit of gaseous electric discharge lamps | |
GB539465A (en) | Improved circuit arrangements for operating electric discharge lamps | |
GB581332A (en) | Improvements in and relating to operating mechanism for electric discharge lamps | |
US2549353A (en) | Circuits for operating electrical discharge devices | |
GB550308A (en) | Improvements in and relating to electric discharge lamp circuits | |
US2296062A (en) | Electric discharge apparatus | |
US2714691A (en) | Starting and operating circuits for fluorescent lamps | |
GB558565A (en) | Improvements in and relating to electric discharge lamps | |
US2362820A (en) | Thermal relay for starting fluorescent lamps | |
GB530828A (en) | Improvements in and relating to electric discharge lamps | |
GB543171A (en) | Improvements in operating circuit arrangements for electric discharge devices | |
GB528474A (en) | Improvements in combination of high-pressure metal-vapour electric discharge lamps with circuit elements for operating them | |
GB627714A (en) | Improvements in or relating to electric socket-switches | |
GB682673A (en) | Improvements in and relating to electric cooking ranges | |
GB553831A (en) | Improved operating circuit for low pressure gaseous electric discharge lamps | |
GB565302A (en) | Improvements relating to starting switches for electric discharge devices | |
GB617112A (en) | Improvements in electric gas discharge tubes | |
GB562909A (en) | Improvements in and relating to switching mechanism for electric discharge lamps | |
GB686735A (en) | Glow discharge switch for igniting electric discharge tubes, particularly for use with direct current, and circuit containing same | |
GB536750A (en) | Improvements in discharge-operated thermal switches | |
GB640948A (en) | Improvements in or relating to glow discharge thermal switches and circuits incorporating such switches | |
GB539393A (en) | Improved operating circuit for gaseous electric discharge devices | |
GB663608A (en) | Improvements relating to glow discharge thermal switches and operating circuits for electric discharge lamps employing same | |
GB551966A (en) | Improvements in air-break electric circuit breakers |