DE59506476D1 - Circuit arrangement for monitoring the lamp operation of at least two fluorescent lamps - Google Patents

Circuit arrangement for monitoring the lamp operation of at least two fluorescent lamps

Info

Publication number
DE59506476D1
DE59506476D1 DE59506476T DE59506476T DE59506476D1 DE 59506476 D1 DE59506476 D1 DE 59506476D1 DE 59506476 T DE59506476 T DE 59506476T DE 59506476 T DE59506476 T DE 59506476T DE 59506476 D1 DE59506476 D1 DE 59506476D1
Authority
DE
Germany
Prior art keywords
fluorescent lamps
monitoring
circuit arrangement
lamp operation
control 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 - Fee Related
Application number
DE59506476T
Other languages
German (de)
Inventor
Bernhard Orben
Juergen Klier
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of DE59506476D1 publication Critical patent/DE59506476D1/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
    • H05B41/282—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
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Abstract

The circuit monitors the function of at least two fluorescent lamps (LL1,LL2), using a detection network (R1,..R7, C1,D1) connected to the lamp current circuits and coupled to a control circuit (5) for a switch (V3,RE,S1) allowing the lamps to be connected in parallel upon detection of lamp failure. The control circuit has a storage capacitor coupled to the detection network as the input element, its charge corresponding to the voltage across the monitored lamp current circuits, with two alternatively-activated switch stages (VI,R8,..R10,C3 ; V2,D3,D4, R11,...R14, C4), with different response thresholds used to provide the switching signals for the controlled switch.
DE59506476T 1995-05-31 1995-05-31 Circuit arrangement for monitoring the lamp operation of at least two fluorescent lamps Expired - Fee Related DE59506476D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95108385A EP0746185B1 (en) 1995-05-31 1995-05-31 Monitoring circuit for a two lamp system

Publications (1)

Publication Number Publication Date
DE59506476D1 true DE59506476D1 (en) 1999-09-02

Family

ID=8219321

Family Applications (1)

Application Number Title Priority Date Filing Date
DE59506476T Expired - Fee Related DE59506476D1 (en) 1995-05-31 1995-05-31 Circuit arrangement for monitoring the lamp operation of at least two fluorescent lamps

Country Status (3)

Country Link
EP (1) EP0746185B1 (en)
AT (1) ATE182737T1 (en)
DE (1) DE59506476D1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146683B1 (en) 1981-07-31 1987-11-19 Siemens Aktiengesellschaft Dc-ac conventer
DE3938677A1 (en) * 1989-11-22 1991-05-23 Trilux Lenze Gmbh & Co Kg Fluorescent lamp starter circuit - allows several lamps to be operated from single unit
US5089753A (en) * 1990-07-09 1992-02-18 North American Philips Corporation Arrangement for predicting failure in fluorescent lamp systems
DE59207186D1 (en) 1992-03-02 1996-10-24 Siemens Ag Circuit arrangement for operating several fluorescent lamps with one ballast

Also Published As

Publication number Publication date
EP0746185A1 (en) 1996-12-04
EP0746185B1 (en) 1999-07-28
ATE182737T1 (en) 1999-08-15

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee