GB539465A - Improved circuit arrangements for operating electric discharge lamps - Google Patents

Improved circuit arrangements for operating electric discharge lamps

Info

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
Application number
GB506640A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB506640A priority Critical patent/GB539465A/en
Publication of GB539465A publication Critical patent/GB539465A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02Details
    • H05B41/04Starting switches
    • H05B41/06Starting 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.
GB506640A 1940-03-19 1940-03-19 Improved circuit arrangements for operating electric discharge lamps Expired GB539465A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562692A (en) * 1948-06-04 1951-07-31 Air Reduction Overvoltage protective device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562692A (en) * 1948-06-04 1951-07-31 Air Reduction Overvoltage protective device

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