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)

Similar Documents

Publication Publication Date Title
KR850003996A (en) Switch mode power supply with protection circuit for primary current limit
GB1013272A (en) Circuit control means
GB1529760A (en) Transistor switching circuit arrangements
GB955356A (en) Improvements in or relating to lamp monitoring apparatus
GB931534A (en) Improvements in theatre lighting control apparatus
GB1422596A (en) Oscillator circuit and protection arrangement therefor
FR2371081A1 (en) DIPOLE WITH TRANSISTOR INTENDED TO SWITCH FOR A PREDETERMINED DIFFERENCE OF POTENTIAL
SE8602895D0 (en) TRANSISTOR BASE DRIVE CIRCUIT
GB1258442A (en)
EP0182571A3 (en) Semiconductor switching device
GB1015691A (en) A circuit for monitoring the voltage of a d.c. source
GB1000833A (en) Current limiting networks
GB1103797A (en) Improvements in switching circuits
GB886008A (en) Electro-magnetic relay circuits
JPS5738028A (en) Gate circuit for gate turnoff thyristor
JPS57192130A (en) Gate circuit for gto thyristor
JPS5671471A (en) Control device of gate turn-off thyristor
GB980370A (en) Improvements in or relating to current regulating transistor circuit arrangements
FR2379936A1 (en) Ozoniser supply circuit - with thyristorised rectifier and chopper circuit for transformer primary winding
GB1091655A (en) A self-excited alternator having a self starting circuit
JPS5797228A (en) Gate circuit for gate turn-off thyristor
JPS57208732A (en) Gate driving circuit for gate turn-off thyristor
GB851394A (en) Improvements in or relating to electric amplifiers
JPS5743560A (en) Gate circuit of gate turn-off thyristor
ES2027290T3 (en) CALL CURRENT CIRCUIT.