GB1429338A - Electrical supply circuit for a hollow cathode lamp - Google Patents

Electrical supply circuit for a hollow cathode lamp

Info

Publication number
GB1429338A
GB1429338A GB2360273A GB2360273A GB1429338A GB 1429338 A GB1429338 A GB 1429338A GB 2360273 A GB2360273 A GB 2360273A GB 2360273 A GB2360273 A GB 2360273A GB 1429338 A GB1429338 A GB 1429338A
Authority
GB
United Kingdom
Prior art keywords
lamp
current
voltage
changes
supply circuit
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
GB2360273A
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.)
Rank Organization Ltd
Original Assignee
Rank Organization 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 Rank Organization Ltd filed Critical Rank Organization Ltd
Priority to GB2360273A priority Critical patent/GB1429338A/en
Priority to US471045A priority patent/US3911319A/en
Priority to FR7417342A priority patent/FR2230145B3/fr
Priority to DE2424019A priority patent/DE2424019A1/en
Publication of GB1429338A publication Critical patent/GB1429338A/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
    • H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

1429338 Automatic current control RANK ORGANISATION Ltd 9 May 1974 [17 May 1973] 23602/73 Heading G3R [Also in Divsion H2] A circuit for maintaining a constant current through a discharge lamp L comprises a transistor T and an operational amplifier A. The lamp is supplied with a D.C. voltage VR and a potentiometer P, connected to a squarewave generator G, sets the value of the current flowing through the lamp. If the current through the lamp tends to change due to changes in the lamp temperture or in the value of the voltage VR, the voltage VI across a resistor R also changes. The output of the amplifier A therefore changes to adjust the conduction of the transistor T so that the lamp current remains constant. A light emitting diode LED visibly indicates the lamp current.
GB2360273A 1973-05-17 1973-05-17 Electrical supply circuit for a hollow cathode lamp Expired GB1429338A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2360273A GB1429338A (en) 1973-05-17 1973-05-17 Electrical supply circuit for a hollow cathode lamp
US471045A US3911319A (en) 1973-05-17 1974-05-17 Electronic apparatus
FR7417342A FR2230145B3 (en) 1973-05-17 1974-05-17
DE2424019A DE2424019A1 (en) 1973-05-17 1974-05-17 CIRCUIT ARRANGEMENT FOR A HOLLOW CATHODE LAMP

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2360273A GB1429338A (en) 1973-05-17 1973-05-17 Electrical supply circuit for a hollow cathode lamp

Publications (1)

Publication Number Publication Date
GB1429338A true GB1429338A (en) 1976-03-24

Family

ID=10198317

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2360273A Expired GB1429338A (en) 1973-05-17 1973-05-17 Electrical supply circuit for a hollow cathode lamp

Country Status (4)

Country Link
US (1) US3911319A (en)
DE (1) DE2424019A1 (en)
FR (1) FR2230145B3 (en)
GB (1) GB1429338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135846A (en) * 1983-02-04 1984-09-05 Standard Telephones Cables Ltd Current splitter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238415A (en) * 1961-09-22 1966-03-01 G K Turner Associates Electric arc control circuit
US3309567A (en) * 1965-10-22 1967-03-14 Berkey Photo Inc Pulse discharge lamp circuit
US3449630A (en) * 1965-12-20 1969-06-10 Xerox Corp Modulation of arc lamp
US3497768A (en) * 1968-03-05 1970-02-24 Addressograph Multigraph One shot operation circuit for a gas discharge lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135846A (en) * 1983-02-04 1984-09-05 Standard Telephones Cables Ltd Current splitter

Also Published As

Publication number Publication date
DE2424019A1 (en) 1974-12-12
FR2230145A1 (en) 1974-12-13
US3911319A (en) 1975-10-07
FR2230145B3 (en) 1977-03-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee