GB995908A - Improvements in circuit arrangements for operating gas discharge lamps - Google Patents

Improvements in circuit arrangements for operating gas discharge lamps

Info

Publication number
GB995908A
GB995908A GB1175762A GB1175762A GB995908A GB 995908 A GB995908 A GB 995908A GB 1175762 A GB1175762 A GB 1175762A GB 1175762 A GB1175762 A GB 1175762A GB 995908 A GB995908 A GB 995908A
Authority
GB
United Kingdom
Prior art keywords
winding
lamp
autotransformer
oscillator
contacts
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
GB1175762A
Inventor
Martin Raymond Percival Seib
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.)
CAPS RES Ltd
Original Assignee
CAPS RES 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 CAPS RES Ltd filed Critical CAPS RES Ltd
Priority to GB1175762A priority Critical patent/GB995908A/en
Publication of GB995908A publication Critical patent/GB995908A/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
    • H05B41/02—Details
    • H05B41/04—Starting switches

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

995,908. Supply circuits for discharge lamps. CAPS RESEARCH Ltd. April 3, 1963 [March 27, 1962], No. 11757/62. Heading H2H. A mercury arc discharge lamp 25 is started by high-frequency pulses generated by a pushpull transistor oscillator 4 and superimposed on the output from the winding of an autotransformer 1, a switch 11 operating after a predetermined time to connect the lamp 25 and its ballast choke 26 to only half the autotransformer winding for normal running. The oscillator 4 is supplied from the autotransformer 1 through a rectifier bridge 3 which also supplies the windings 5, 6, 7 associated respectively with locking switches 8, 9, a thermal delay switch 12 and the switch 11, the positions of these switches when the circuit is unenergized being as shown in the drawing. Closure of a main switch 2 energizes the oscillator 4 and windings 6, 7, and causes instantaneous engagement of contacts 22, 23, 24 followed by permanent engagement of contacts 22, 24 to connect members 25, 26 and the secondary winding 21 of the oscillator transformer 19 in series across the autotransformer 1. Striking of the lamp 25 reduces the oscillator open loop gain below unity to damp the oscillations, the output of autotransformer 1 being sufficient to maintain the lamp current, and the oscillations increasing to their initial value should the lamp go out, thereby causing restriking. After a predetermined time the delay switch 12 operates to de-energize the windings 6, 7 and energize the winding 5 which is locked by the respective opening and closing of its contacts 8, 9. Deenergization of winding 7 causes engagement of contacts 23, 24 and their subsequent separation from contact 22 to disconnect the winding 21 and connect members 25, 26 to approximately half of the winding of autotransformer 1. An electromagnetically controlled air valve whose winding 28 is responsive to the lamp voltage is operated to supply cooling air to the lamp when its arc voltage has risen to the normal operating value. The oscillator 4 remains energized after the switch 12 has operated and is inhibited by a resistor 27 which also prevents arcing between the contacts 22, 24. Striking of the lamp 25 causes the core of transformer 19 to be driven into saturation.
GB1175762A 1962-03-27 1962-03-27 Improvements in circuit arrangements for operating gas discharge lamps Expired GB995908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1175762A GB995908A (en) 1962-03-27 1962-03-27 Improvements in circuit arrangements for operating gas discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1175762A GB995908A (en) 1962-03-27 1962-03-27 Improvements in circuit arrangements for operating gas discharge lamps

Publications (1)

Publication Number Publication Date
GB995908A true GB995908A (en) 1965-06-23

Family

ID=9992144

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1175762A Expired GB995908A (en) 1962-03-27 1962-03-27 Improvements in circuit arrangements for operating gas discharge lamps

Country Status (1)

Country Link
GB (1) GB995908A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331905A (en) * 1980-10-27 1982-05-25 General Electric Company Starting and operating circuit for gaseous discharge lamps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331905A (en) * 1980-10-27 1982-05-25 General Electric Company Starting and operating circuit for gaseous discharge lamps

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