GB739045A - Improvements in dimming circuits for electric discharge lamps - Google Patents

Improvements in dimming circuits for electric discharge lamps

Info

Publication number
GB739045A
GB739045A GB1366051A GB1366051A GB739045A GB 739045 A GB739045 A GB 739045A GB 1366051 A GB1366051 A GB 1366051A GB 1366051 A GB1366051 A GB 1366051A GB 739045 A GB739045 A GB 739045A
Authority
GB
United Kingdom
Prior art keywords
lamp
variable impedance
impedance
winding
choke
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
GB1366051A
Inventor
William Albert Stickley
Charles Rivers Passmore
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn Electrical Industries 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Priority to GB1366051A priority Critical patent/GB739045A/en
Publication of GB739045A publication Critical patent/GB739045A/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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

739,045. Control systems for space discharge apparatus. THORN ELECTRICAL INDUSTRIES, Ltd. June 9, 1952 [June 8, 1951], No. 13660/51. Class 38 (4). Dimming of a plurality of electric discharge lamps 10 is effected by a variable impedance 20 connected in shunt with an auxiliary winding 19 of a respective choke 17 serially connected with each lamp to A.C. supply terminals L, N, the main winding 18 of each choke 17 and its lamp 10 being connected in parallel with the other main windings and lamp. As shown each auxiliary winding 19 has a respective variable impedance 20 but in other embodiments all the auxiliary windings 19 are serially connected with a single, commoning variable impedance 20 which may be a resistance. Also as shown, for use in theatre lighting for example, there may be connected a further variable impedance 26 in either lead to the A.C. supply terminal L or N which further impedance 26 dims the lamps to a degree present for each lamp individually by impedance 20. For lamps requiring electrode preheating starting switches or heating transformers 21 may be provided, while for assisting starting each lamp may have an earthed external starting strip 25. In Fig. 4, not shown, each lamp may be replaced by two in series, and each choke auxiliary winding 19 may have a manually or automatically operable switch by which the winding is shorted should its associated lamp not strike. The Provisional Specification refers to the dimming of a single discharge lamp. Specification 720,264 is referred to.
GB1366051A 1951-06-08 1951-06-08 Improvements in dimming circuits for electric discharge lamps Expired GB739045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1366051A GB739045A (en) 1951-06-08 1951-06-08 Improvements in dimming circuits for electric discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1366051A GB739045A (en) 1951-06-08 1951-06-08 Improvements in dimming circuits for electric discharge lamps

Publications (1)

Publication Number Publication Date
GB739045A true GB739045A (en) 1955-10-26

Family

ID=10027081

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1366051A Expired GB739045A (en) 1951-06-08 1951-06-08 Improvements in dimming circuits for electric discharge lamps

Country Status (1)

Country Link
GB (1) GB739045A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1142961B (en) * 1959-06-26 1963-01-31 Johann Buser Circuit arrangement for facilitating the ignition and for low-interference operation of several gas discharge lamps fed from different phases of a multi-phase network
GB2274219A (en) * 1993-01-09 1994-07-13 Smiths Industries Plc Power control for an electric heater
US6229270B1 (en) 1997-07-29 2001-05-08 Indigitale Limited Variable high frequency lamp controllers and systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1142961B (en) * 1959-06-26 1963-01-31 Johann Buser Circuit arrangement for facilitating the ignition and for low-interference operation of several gas discharge lamps fed from different phases of a multi-phase network
GB2274219A (en) * 1993-01-09 1994-07-13 Smiths Industries Plc Power control for an electric heater
US6229270B1 (en) 1997-07-29 2001-05-08 Indigitale Limited Variable high frequency lamp controllers and systems

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