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EP1233657A3 - Protective circuit for a fluorescent lamp - Google Patents

Protective circuit for a fluorescent lamp Download PDF

Info

Publication number
EP1233657A3
EP1233657A3 EP02001285A EP02001285A EP1233657A3 EP 1233657 A3 EP1233657 A3 EP 1233657A3 EP 02001285 A EP02001285 A EP 02001285A EP 02001285 A EP02001285 A EP 02001285A EP 1233657 A3 EP1233657 A3 EP 1233657A3
Authority
EP
European Patent Office
Prior art keywords
fluorescent lamp
protective circuit
resistor
bridges
resistors
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.)
Granted
Application number
EP02001285A
Other languages
German (de)
French (fr)
Other versions
EP1233657A2 (en
EP1233657B1 (en
Inventor
Harald Schmitt
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1233657A2 publication Critical patent/EP1233657A2/en
Publication of EP1233657A3 publication Critical patent/EP1233657A3/en
Application granted granted Critical
Publication of EP1233657B1 publication Critical patent/EP1233657B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

a protective circuit for a fluorescent lamp includes a third resistor (R3) that bridges a decoupling capacitor (C2), and a fourth resistor (R4) that connects a first reference point (A) to a positive pole of a DC voltage source (UZ), the resistors being selected such that the reference points are at the same potential without the fluorescent lamp inserted.
EP02001285A 2001-02-20 2002-01-17 Protective circuit for a fluorescent lamp Expired - Lifetime EP1233657B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10108138A DE10108138A1 (en) 2001-02-20 2001-02-20 Protection circuit for a fluorescent lamp
DE10108138 2001-02-20

Publications (3)

Publication Number Publication Date
EP1233657A2 EP1233657A2 (en) 2002-08-21
EP1233657A3 true EP1233657A3 (en) 2006-05-24
EP1233657B1 EP1233657B1 (en) 2007-07-25

Family

ID=7674857

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02001285A Expired - Lifetime EP1233657B1 (en) 2001-02-20 2002-01-17 Protective circuit for a fluorescent lamp

Country Status (7)

Country Link
US (1) US6650514B2 (en)
EP (1) EP1233657B1 (en)
CN (1) CN100477880C (en)
AT (1) ATE368367T1 (en)
CA (1) CA2373571A1 (en)
DE (2) DE10108138A1 (en)
TW (1) TW540255B (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209619A1 (en) * 2002-03-05 2003-09-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Operating circuit for discharge lamp with EOL early detection
US6979959B2 (en) 2002-12-13 2005-12-27 Microsemi Corporation Apparatus and method for striking a fluorescent lamp
US7598677B2 (en) * 2003-08-26 2009-10-06 Q Technology, Inc. Multiple failure detection shutdown protection circuit for an electronic ballast
US7405522B2 (en) * 2003-08-26 2008-07-29 Q Technology, Inc. Multiple failure detection shutdown protection circuit for an electronic ballast
US7187139B2 (en) 2003-09-09 2007-03-06 Microsemi Corporation Split phase inverters for CCFL backlight system
US7183727B2 (en) 2003-09-23 2007-02-27 Microsemi Corporation Optical and temperature feedbacks to control display brightness
US7468722B2 (en) 2004-02-09 2008-12-23 Microsemi Corporation Method and apparatus to control display brightness with ambient light correction
WO2005099316A2 (en) 2004-04-01 2005-10-20 Microsemi Corporation Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system
US7755595B2 (en) 2004-06-07 2010-07-13 Microsemi Corporation Dual-slope brightness control for transflective displays
DE102005013898A1 (en) * 2005-03-24 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating at least one first and one second lamp insertable therein
DE102005028419A1 (en) * 2005-06-20 2006-12-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Electronic ballast for e.g. coldstarting discharge lamp, has varistor, shutdown device, diode, resistors and integration capacitor connected in parallel for limiting voltage across intermediate circuit capacitor
US7414371B1 (en) 2005-11-21 2008-08-19 Microsemi Corporation Voltage regulation loop with variable gain control for inverter circuit
US7569998B2 (en) 2006-07-06 2009-08-04 Microsemi Corporation Striking and open lamp regulation for CCFL controller
DE102006036293A1 (en) * 2006-08-03 2008-02-14 Cooper Crouse-Hinds Gmbh monitoring device
EP2127499B1 (en) * 2007-03-29 2011-02-16 Osram Gesellschaft mit beschränkter Haftung Circuit configuration for controlling at least one fluorescent lamp
US8319446B2 (en) 2007-04-19 2012-11-27 Osram Ag Circuit for controlling a fluorescent lamp, method for operating the circuit, and system comprising the circuit
US8093839B2 (en) 2008-11-20 2012-01-10 Microsemi Corporation Method and apparatus for driving CCFL at low burst duty cycle rates
US8487541B2 (en) * 2010-10-11 2013-07-16 General Electric Company Method to ensure ballast starting regardless of half cycle input
US8810146B1 (en) 2011-11-04 2014-08-19 Universal Lighting Technologies, Inc. Lighting device with circuit and method for detecting power converter activity
DE102012207002A1 (en) * 2011-12-23 2013-06-27 Tridonic Gmbh & Co. Kg Procedure, control gear and lighting system
CN103369770B (en) * 2012-03-31 2016-09-07 海洋王照明科技股份有限公司 Light fixture thermal-shutdown circuit and device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5770925A (en) * 1997-05-30 1998-06-23 Motorola Inc. Electronic ballast with inverter protection and relamping circuits
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
EP0886460A1 (en) * 1997-06-18 1998-12-23 Oy Helvar Electronic ballast with circuit for detecting rectification by lamp
WO2000011916A1 (en) * 1998-08-20 2000-03-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit for operating at least one discharge lamp

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425859A1 (en) * 1994-07-21 1996-01-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating one or more low-pressure discharge lamps
EP0753987B1 (en) * 1995-07-12 1998-12-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit and method of operation for electric lamps
DE19548506A1 (en) * 1995-12-22 1997-06-26 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating a lamp
DE19612170A1 (en) * 1996-03-27 1997-10-02 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating electric lamps and operating methods for electric lamps
DE19830368A1 (en) * 1998-07-07 2000-02-03 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Electronic ballast with inrush current limitation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
US5770925A (en) * 1997-05-30 1998-06-23 Motorola Inc. Electronic ballast with inverter protection and relamping circuits
EP0886460A1 (en) * 1997-06-18 1998-12-23 Oy Helvar Electronic ballast with circuit for detecting rectification by lamp
WO2000011916A1 (en) * 1998-08-20 2000-03-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit for operating at least one discharge lamp

Also Published As

Publication number Publication date
EP1233657A2 (en) 2002-08-21
TW540255B (en) 2003-07-01
ATE368367T1 (en) 2007-08-15
US6650514B2 (en) 2003-11-18
EP1233657B1 (en) 2007-07-25
CN1374824A (en) 2002-10-16
CN100477880C (en) 2009-04-08
CA2373571A1 (en) 2002-08-20
DE50210534D1 (en) 2007-09-06
DE10108138A1 (en) 2002-08-29
US20020114114A1 (en) 2002-08-22

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