GB955356A - Improvements in or relating to lamp monitoring apparatus - Google Patents

Improvements in or relating to lamp monitoring apparatus

Info

Publication number
GB955356A
GB955356A GB4457561A GB4457561A GB955356A GB 955356 A GB955356 A GB 955356A GB 4457561 A GB4457561 A GB 4457561A GB 4457561 A GB4457561 A GB 4457561A GB 955356 A GB955356 A GB 955356A
Authority
GB
United Kingdom
Prior art keywords
transistor
voltage
lamp
winding
diode
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
GB4457561A
Inventor
Peter Skinner
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.)
Decca Ltd
Original Assignee
Decca 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 Decca Ltd filed Critical Decca Ltd
Priority to GB4457561A priority Critical patent/GB955356A/en
Publication of GB955356A publication Critical patent/GB955356A/en
Expired legal-status Critical Current

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
    • H05B41/46—Circuits providing for substitution in case of failure of the lamp

Landscapes

  • Power Conversion In General (AREA)

Abstract

955,356. Semi-conductor switching circuits. DECCA Ltd. Nov. 28, 1962 [Dec. 13, 1961], No. 44575/61. Heading H3T. [Also in Division G4] Apparatus for mounting a fluorescent lamp (see Division G4) comprises a transistor 23, normally biased to be conducting, to the base of which is applied a direct voltage derived from rectifying the alternating voltage produced in an auxiliary winding 20 on transformer 13. When the lamp 10 is struck, the voltage on winding 20 is insufficient to overcome the bias applied by Zener diode 28, and diode 21 is non- conducting so that transistor 23 is forward biased. If lamp 10 is not struck, the voltage on winding 20 is insufficient to overcome the bias of the Zener diode and transistor 23 is cut off. In an alternative embodiment, Fig. 2 (not shown), the auxiliary winding is on the ballast choke 14 and the voltage developed is rectified and used to forward or reverse bias a diode in the transistor base circuit.
GB4457561A 1961-12-13 1961-12-13 Improvements in or relating to lamp monitoring apparatus Expired GB955356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4457561A GB955356A (en) 1961-12-13 1961-12-13 Improvements in or relating to lamp monitoring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4457561A GB955356A (en) 1961-12-13 1961-12-13 Improvements in or relating to lamp monitoring apparatus

Publications (1)

Publication Number Publication Date
GB955356A true GB955356A (en) 1964-04-15

Family

ID=10433926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4457561A Expired GB955356A (en) 1961-12-13 1961-12-13 Improvements in or relating to lamp monitoring apparatus

Country Status (1)

Country Link
GB (1) GB955356A (en)

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