GB2370924B - Improvements in or relating to electric lights - Google Patents

Improvements in or relating to electric lights

Info

Publication number
GB2370924B
GB2370924B GB0203726A GB0203726A GB2370924B GB 2370924 B GB2370924 B GB 2370924B GB 0203726 A GB0203726 A GB 0203726A GB 0203726 A GB0203726 A GB 0203726A GB 2370924 B GB2370924 B GB 2370924B
Authority
GB
United Kingdom
Prior art keywords
relating
electric lights
lights
electric
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 - Fee Related
Application number
GB0203726A
Other versions
GB0203726D0 (en
GB2370924A (en
Inventor
Lawrence Samuel Tyson
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.)
Microlights Ltd
Original Assignee
Microlights 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
Priority claimed from GBGB9917530.9A external-priority patent/GB9917530D0/en
Priority claimed from GBGB9917532.5A external-priority patent/GB9917532D0/en
Priority claimed from GB9927344A external-priority patent/GB2344004B/en
Application filed by Microlights Ltd filed Critical Microlights Ltd
Priority claimed from GB0018375A external-priority patent/GB2353153B/en
Publication of GB0203726D0 publication Critical patent/GB0203726D0/en
Publication of GB2370924A publication Critical patent/GB2370924A/en
Application granted granted Critical
Publication of GB2370924B publication Critical patent/GB2370924B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • 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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
GB0203726A 1999-07-26 2000-07-26 Improvements in or relating to electric lights Expired - Fee Related GB2370924B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9917530.9A GB9917530D0 (en) 1999-07-26 1999-07-26 Improvements to electrical lights
GBGB9917532.5A GB9917532D0 (en) 1999-07-26 1999-07-26 Improvements to electrical lights
GB9927344A GB2344004B (en) 1998-11-18 1999-11-18 Improvements to electronic ballasts
GB0018375A GB2353153B (en) 1999-07-26 2000-07-26 Improvements in and relating to electric lights

Publications (3)

Publication Number Publication Date
GB0203726D0 GB0203726D0 (en) 2002-04-03
GB2370924A GB2370924A (en) 2002-07-10
GB2370924B true GB2370924B (en) 2002-12-18

Family

ID=27447866

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0203726A Expired - Fee Related GB2370924B (en) 1999-07-26 2000-07-26 Improvements in or relating to electric lights

Country Status (1)

Country Link
GB (1) GB2370924B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023494A1 (en) * 1994-02-25 1995-08-31 Energy Savings, Inc. Fault tolerant electronic ballast
US5635799A (en) * 1996-05-10 1997-06-03 Magnetek Lamp protection circuit for electronic ballasts
US5650694A (en) * 1995-03-31 1997-07-22 Philips Electronics North America Corporation Lamp controller with lamp status detection and safety circuitry
US5747941A (en) * 1995-12-07 1998-05-05 Energy Savings, Inc. Electronic ballast that monitors direct current through lamp filaments

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023494A1 (en) * 1994-02-25 1995-08-31 Energy Savings, Inc. Fault tolerant electronic ballast
US5650694A (en) * 1995-03-31 1997-07-22 Philips Electronics North America Corporation Lamp controller with lamp status detection and safety circuitry
US5747941A (en) * 1995-12-07 1998-05-05 Energy Savings, Inc. Electronic ballast that monitors direct current through lamp filaments
US5635799A (en) * 1996-05-10 1997-06-03 Magnetek Lamp protection circuit for electronic ballasts

Also Published As

Publication number Publication date
GB0203726D0 (en) 2002-04-03
GB2370924A (en) 2002-07-10

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Legal Events

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

Effective date: 20110726