EP0727921A3 - Circuit for operating a discharge lamp - Google Patents

Circuit for operating a discharge lamp Download PDF

Info

Publication number
EP0727921A3
EP0727921A3 EP96101834A EP96101834A EP0727921A3 EP 0727921 A3 EP0727921 A3 EP 0727921A3 EP 96101834 A EP96101834 A EP 96101834A EP 96101834 A EP96101834 A EP 96101834A EP 0727921 A3 EP0727921 A3 EP 0727921A3
Authority
EP
European Patent Office
Prior art keywords
generator
operating
circuit
output
discharge lamp
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
EP96101834A
Other languages
German (de)
French (fr)
Other versions
EP0727921B1 (en
EP0727921A2 (en
Inventor
Arnulf Rupp
Gunther Dr. Löhmann
Alwin Veser
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 EP0727921A2 publication Critical patent/EP0727921A2/en
Publication of EP0727921A3 publication Critical patent/EP0727921A3/en
Application granted granted Critical
Publication of EP0727921B1 publication Critical patent/EP0727921B1/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)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The gas-discharge tube (LP) with e.g. its preheater (VH) is connected to the output of a generator (G) of AC at a predetermined high frequency from the mains supply. A control input of the generator is connected to a switch-off device (AV) producing a signal (CS1) when activated by the detector (VE) of the peak-to-peak voltage across the lamp. The output (UA) of the detector is proportional to the detected peak-to-peak voltage. When this output exceeds a threshold value the generator is switched off.
EP96101834A 1995-02-17 1996-02-08 Method for shutting-down a Circuit for operating a discharge lamp Expired - Lifetime EP0727921B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19505460A DE19505460A1 (en) 1995-02-17 1995-02-17 Circuit arrangement for operating a discharge lamp
DE19505460 1995-02-17

Publications (3)

Publication Number Publication Date
EP0727921A2 EP0727921A2 (en) 1996-08-21
EP0727921A3 true EP0727921A3 (en) 1998-05-27
EP0727921B1 EP0727921B1 (en) 2001-04-25

Family

ID=7754293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101834A Expired - Lifetime EP0727921B1 (en) 1995-02-17 1996-02-08 Method for shutting-down a Circuit for operating a discharge lamp

Country Status (4)

Country Link
EP (1) EP0727921B1 (en)
AT (1) ATE200842T1 (en)
DE (2) DE19505460A1 (en)
FI (1) FI113736B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6054013A (en) * 1996-02-02 2000-04-25 Applied Materials, Inc. Parallel plate electrode plasma reactor having an inductive antenna and adjustable radial distribution of plasma ion density
EP0843505A1 (en) 1996-11-19 1998-05-20 Siemens Aktiengesellschaft Electronic ballast for at least one discharge lamp
DE19715341C1 (en) * 1997-04-12 1998-10-15 Vossloh Schwabe Gmbh Electronic ballast with automatic restart
DE10013342A1 (en) * 2000-03-17 2001-09-27 Trilux Lenze Gmbh & Co Kg Producing ignition voltage for fluorescent lamps involves applying start voltages of reducing frequency until lamp voltage reaches desired value

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5023516A (en) * 1988-05-10 1991-06-11 Matsushita Electric Industrial Co., Ltd. Discharge lamp operation apparatus
EP0564895A1 (en) * 1992-04-06 1993-10-13 Starkstrom-Elektronik Ag Electronic ballast for low pressure discharge lamps
EP0776148A1 (en) * 1995-11-27 1997-05-28 Oy Helvar Safety circuit for a ballast in a fluorescent lamp

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5574335A (en) * 1994-08-02 1996-11-12 Osram Sylvania Inc. Ballast containing protection circuit for detecting rectification of arc discharge lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5023516A (en) * 1988-05-10 1991-06-11 Matsushita Electric Industrial Co., Ltd. Discharge lamp operation apparatus
EP0564895A1 (en) * 1992-04-06 1993-10-13 Starkstrom-Elektronik Ag Electronic ballast for low pressure discharge lamps
EP0776148A1 (en) * 1995-11-27 1997-05-28 Oy Helvar Safety circuit for a ballast in a fluorescent lamp

Also Published As

Publication number Publication date
DE19505460A1 (en) 1996-08-22
EP0727921B1 (en) 2001-04-25
ATE200842T1 (en) 2001-05-15
DE59606813D1 (en) 2001-05-31
FI113736B (en) 2004-05-31
EP0727921A2 (en) 1996-08-21
FI960659A (en) 1996-08-18
FI960659A0 (en) 1996-02-14

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