GB1358829A - Discharge lamp ballast circuits - Google Patents

Discharge lamp ballast circuits

Info

Publication number
GB1358829A
GB1358829A GB5408073A GB5408073A GB1358829A GB 1358829 A GB1358829 A GB 1358829A GB 5408073 A GB5408073 A GB 5408073A GB 5408073 A GB5408073 A GB 5408073A GB 1358829 A GB1358829 A GB 1358829A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
lamp
discharge lamp
supply
july
voltage
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
GB5408073A
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.)
EMI Group Ltd
Original Assignee
EMI Group 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

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02Details
    • H05B41/04Starting switches
    • H05B41/042Starting switches using semiconductor devices

Abstract

1358829 Supply circuits for discharge lamps THORN ELECTRICAL INDUSTRIES Ltd 13 July 1972 [20 July 1971] 54080/73 Divided out of 1354723 Heading H2H A ballast circuit for a discharge lamp 42 comprises first and second input terminals 40 connectible to an alternating voltage source, first and second output terminals 41 for supplying a misdirectional voltage to the lamp, a capacitor 49, an inductor 50 and three pairs of oppositely poled diodes 46, 48; 52, 56; 54, 58. The current supplied to the lamp includes a large D.C. component and a ripple at a frequency four times the supply frequency. The supply of D.C. to the lamp eliminates flicker and the voltage across the lamp is sufficient to strike a high pressure mercury vapour discharge lamp.
GB5408073A 1972-07-13 1972-07-13 Discharge lamp ballast circuits Expired GB1358829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5408073A GB1358829A (en) 1972-07-13 1972-07-13 Discharge lamp ballast circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5408073A GB1358829A (en) 1972-07-13 1972-07-13 Discharge lamp ballast circuits

Publications (1)

Publication Number Publication Date
GB1358829A true true GB1358829A (en) 1974-07-03

Family

ID=10469855

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5408073A Expired GB1358829A (en) 1972-07-13 1972-07-13 Discharge lamp ballast circuits

Country Status (1)

Country Link
GB (1) GB1358829A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445074A (en) * 1980-11-07 1984-04-24 Hitachi, Ltd. Starting circuits for discharge lamps
GB2239568A (en) * 1989-12-22 1991-07-03 Lutron Electronics Co Circuit for dimming gas discharge lamps without introducing striations
US5173643A (en) * 1990-06-25 1992-12-22 Lutron Electronics Co., Inc. Circuit for dimming compact fluorescent lamps

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445074A (en) * 1980-11-07 1984-04-24 Hitachi, Ltd. Starting circuits for discharge lamps
GB2239568A (en) * 1989-12-22 1991-07-03 Lutron Electronics Co Circuit for dimming gas discharge lamps without introducing striations
GB2239568B (en) * 1989-12-22 1994-06-08 Lutron Electronics Co Control System of Gas Discharge Lamps
US5173643A (en) * 1990-06-25 1992-12-22 Lutron Electronics Co., Inc. Circuit for dimming compact fluorescent lamps
US5841239A (en) * 1990-06-25 1998-11-24 Lutron Electronics Co., Inc. Circuit for dimming compact fluorescent lamps

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee