GB738569A - Improvements in and relating to circuits for operating electric discharge lamps - Google Patents

Improvements in and relating to circuits for operating electric discharge lamps

Info

Publication number
GB738569A
GB738569A GB1861651A GB1861651A GB738569A GB 738569 A GB738569 A GB 738569A GB 1861651 A GB1861651 A GB 1861651A GB 1861651 A GB1861651 A GB 1861651A GB 738569 A GB738569 A GB 738569A
Authority
GB
United Kingdom
Prior art keywords
lamp
relay
switch
capacitor
energization
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
GB1861651A
Inventor
William Robert Bloxsidge
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 GB1861651A priority Critical patent/GB738569A/en
Publication of GB738569A publication Critical patent/GB738569A/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
    • H05B41/10—Starting switches magnetic only

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

738,569. Supply systems for space discharge apparatus. THORN ELECTRICAL INDUSTRIES, Ltd. Aug. 7, 1952 [Aug. 7, 1951], No. 18616/51. Class 38 (4). A hot cathode electric discharge lamp 10 is started by a relay which has a normally open switch 20 in the interconnection between the lamp filaments 12, 17 and a coil 21 which is shunted by a capacitor 24 and is serially connected with another, normally closed, switch 23 of the relay across the lamp discharge current supplying terminals 11, 16; the lamp and relay coil circuit are connected through a ballast impedance, shown as a resistance 14, to circuit input terminals 15, 19 to which a D.C. supply is applied. In starting the capacitor 24 is charged up until its voltage attains the pull-in voltage of the relay, energization of which closes switch 20 to complete the filament heating circuit and opens switch 23 to stop the supply mains energization of the relay coil 21. However, the discharge of capacitor 24 maintains the energization of the relay coil for a period to permit filament heating and on eventual drop-out of the relay switch 20 re-opens to put the full supply voltage across the lamp and a radio interference suppressor capacitor 25 shunted across the switch 20 produces a pulse to assist starting of the lamp. During running the volt drop across the ballast impedance prevents the capacitor 24 recharging to such a value as to pull-in the relay again. The invention is applicable to a plurality of series-connected lamps in which case one switch 20 is provided for each lamp and all such switches operate in sequence. Specification 702,939 is referred to.
GB1861651A 1951-08-07 1951-08-07 Improvements in and relating to circuits for operating electric discharge lamps Expired GB738569A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1861651A GB738569A (en) 1951-08-07 1951-08-07 Improvements in and relating to circuits for operating electric discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1861651A GB738569A (en) 1951-08-07 1951-08-07 Improvements in and relating to circuits for operating electric discharge lamps

Publications (1)

Publication Number Publication Date
GB738569A true GB738569A (en) 1955-10-19

Family

ID=10115503

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1861651A Expired GB738569A (en) 1951-08-07 1951-08-07 Improvements in and relating to circuits for operating electric discharge lamps

Country Status (1)

Country Link
GB (1) GB738569A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098096B (en) * 1955-08-20 1961-01-26 Siemens Ag Device for limiting the switch-on time of ignition devices for high-pressure gas discharge lamps, in which the ignition device is switched on for a time limited by the time constant of a capacitor via a relay, which is actuated by the discharge current of the capacitor, according to patent 1044968, or according to its additional patent 1051402 instead, the relay is actuated by the charging current of the capacitor
DE1100168B (en) * 1958-08-01 1961-02-23 Badischer Normteile Und Appbau Circuit arrangement for the simultaneous lighting of a larger number of low-voltage fluorescent lamps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098096B (en) * 1955-08-20 1961-01-26 Siemens Ag Device for limiting the switch-on time of ignition devices for high-pressure gas discharge lamps, in which the ignition device is switched on for a time limited by the time constant of a capacitor via a relay, which is actuated by the discharge current of the capacitor, according to patent 1044968, or according to its additional patent 1051402 instead, the relay is actuated by the charging current of the capacitor
DE1100168B (en) * 1958-08-01 1961-02-23 Badischer Normteile Und Appbau Circuit arrangement for the simultaneous lighting of a larger number of low-voltage fluorescent lamps

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