EP1705963A2 - Circuit pour alimenter au moins deux lampes - Google Patents

Circuit pour alimenter au moins deux lampes Download PDF

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Publication number
EP1705963A2
EP1705963A2 EP06005212A EP06005212A EP1705963A2 EP 1705963 A2 EP1705963 A2 EP 1705963A2 EP 06005212 A EP06005212 A EP 06005212A EP 06005212 A EP06005212 A EP 06005212A EP 1705963 A2 EP1705963 A2 EP 1705963A2
Authority
EP
European Patent Office
Prior art keywords
lamp
circuit arrangement
voltage
circuit
voltage potential
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
EP06005212A
Other languages
German (de)
English (en)
Other versions
EP1705963A3 (fr
EP1705963B1 (fr
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 EP1705963A2 publication Critical patent/EP1705963A2/fr
Publication of EP1705963A3 publication Critical patent/EP1705963A3/fr
Application granted granted Critical
Publication of EP1705963B1 publication Critical patent/EP1705963B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/2986—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit 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
    • H05B41/295—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

Definitions

  • the present invention relates to a circuit arrangement for operating at least a first and a second lamp insertable therein, wherein each lamp has a first and a second coil, with a drive circuit for driving the at least one first and second lamp, wherein the drive circuit is designed, the at least to operate a first and second lamp with a high frequency signal.
  • the object of the present invention is therefore to develop the circuit arrangement mentioned in such a way that damage resulting in the prior art when removing a lamp, can be reliably avoided.
  • the invention is based on the finding that the above-mentioned problem can be met when two voltage potentials are compared with each other, the difference of these two voltage potentials being dependent on whether a lamp has been removed from the circuit arrangement.
  • a deactivation device for deactivating the drive circuit is furthermore provided, wherein the comparator circuit is designed to activate the deactivation device when the difference between the first and the second voltage potential exceeds a predefinable limit value.
  • the second voltage potential preferably depends on the voltage potential at every second filament of each lamp. If a half-bridge circuit is used in the drive circuit, the respective second coil of each lamp is connected to the center of this half-bridge circuit via a respective lamp choke.
  • the difference between the first and second voltage potential, when all lamps are used is smaller than the predeterminable limit value and, if at least one lamp is not used, is greater than the predefinable limit value.
  • the circuit arrangement comprises a second voltage divider, to which the second voltage potential can be tapped, wherein the supply voltage of the second voltage divider is formed by the plurality of voltages at the respective second Filament of each lamp.
  • a time control is preferably provided which is designed to deactivate the deactivation device over a predefinable time period, in particular during the preheating and ignition of the lamps.
  • the timing is supplied via a DC path with voltage which flows through the respective first helix of each lamp in series.
  • a particularly preferred embodiment is finally characterized in that it further comprises a starting device for starting the driving of the lamps by the drive circuit, wherein the starting device is supplied via a DC path, which flows through the respective first helix of each lamp in series, wherein the circuit arrangement is designed such that at least one lamp inserted into the circuit arrangement via the respective direct current flowing through the second coil leads to a second voltage potential, which differs from the first voltage potential by less than the predefinable limit value.
  • This embodiment takes into account the so-called "relamping", ie the start of the circuit arrangement after the replacement of a lamp, without the need for a power interruption. Accordingly, the DC ratio at the comparator circuit is important for the relamping. The starting device is therefore only released again when each lamp is inserted.
  • a sustain member is frequently used to stabilize the triggering condition for activating the deactivating device, for example, a large-sized capacitor charged across the difference of the first and second voltage potentials, the discharge of which may take a significant amount of time, is present the circuit arrangement designed so that even the presence of a lamp in the circuit arrangement in the DC case leads to a second voltage potential, which differs from the first voltage potential by less than the predefinable limit value.
  • the discharge of the holding member is already triggered when removing a lamp, so that it can be safely assumed that when inserting the new second lamp, the holding member is discharged and nothing is in the way of starting the circuit arrangement.
  • Figure 1 shows a schematic representation of a circuit arrangement having a first S1 and a second switch S2 in a half-bridge arrangement, to which the so-called intermediate circuit voltage U zw is applied.
  • two lamps LP1, LP2 are used by way of example, wherein the principle of the present invention can of course be transferred to circuit arrangements with multiple lamps.
  • the lamp LP1 has a first coil W11 and a second coil W12.
  • the lamp LP2 has, in a corresponding manner, a first coil W21 and a second coil W22.
  • the center M of the half-bridge arrangement is connected on the one hand via a choke L1 to the second helix W12 of the lamp LP1, on the other hand via the choke L2 of the second helix W22 of the lamp LP2.
  • the center M of the half-bridge circuit is connected via a resistor R1 to the intermediate circuit voltage U zw .
  • the latter is connected via a resistor R2 to the series connection of the resistors R3 and R6. With the resistor R2 and the coil W11 of the lamp LP1 is connected.
  • the point P between the two first coils W11 and W21 is connected via the coupling capacitor C1 to the intermediate circuit voltage U zw .
  • the first lamp LP1 is a resonance capacitor C2, the second lamp LP2 a resonance capacitor C3 connected in parallel.
  • the second filament W12 of the lamp LP1 is coupled via a resistor R4, the second filament W22 of the lamp LP2 is coupled via a resistor R5 to a resistor R7.
  • the voltage U6 dropping across the resistor R6 and the voltage U7 dropping across the resistor R7 are applied to a comparator circuit 10.
  • the output of the comparator circuit 10 is connected to a capacitor C H , at which a voltage U 11 drops.
  • the filament W21 of the lamp LP2 is connected via a resistor R8 on the one hand to a starting device 12, on the other hand to a timing controller 14.
  • the voltage U 11 is applied to a deactivation device 16, which drives a drive circuit 18 for the switches S1, S2.
  • the drive circuit 18 is also driven by the starting device 1.
  • the two voltage potentials U6 and U7 applied to the comparator circuit 10 are substantially identical.
  • the voltage U6 results from the intermediate circuit voltage U zw through a current flow through the coupling capacitor C1, the coil W11, the resistor R3 via the voltage drop across the resistor R6.
  • the voltage U7 results in the HF case from the intermediate circuit voltage U zw by a current flow through the coupling capacitor C1, the coil W11, the coil W12 and the resistor R4 on the one hand and the coil W21, the coil W22 and the resistor R5 on the other hand by the am Resistor R7 decreasing voltage U7.
  • the voltage U6 results from the voltage drop across the resistor R6 as a result of a current flow across R2, R3 and R6.
  • the voltage U7 results from current flow on the one hand via R1, L1, W12, R4 and on the other hand via a current flow R1, L2, W22, R5 via the voltage drop across the resistor R7 U7.
  • the resistors R2, R3, R6 on the one hand and R1, R4, R5, R7 on the other hand are dimensioned so that the voltage U H , which corresponds to the difference between the voltages U6 and U7, after removal of the lamp LP1 or LP2 from the circuit arrangement is less than the predetermined limit, so that the deactivation of the deactivation device 16 is canceled.
  • initially no renewed start of the drive circuit 18 takes place. Only when the first removed lamp LP1 or LP2 is re-inserted into the circuit, a starting device 12 is supplied with power again, since it is arranged serially to the DC path of each of the first coil W11, W21 of each lamp LP1, LP2 flowing current. As soon as the starting device 12
  • a modifier function can be provided in the comparator circuit 10, which provides the absolute value of the difference between the voltages U6 and U7 at the output 20 of the comparator circuit 10.
  • other switching elements may be provided, for example a digital holding member.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP06005212A 2005-03-24 2006-03-14 Circuit pour alimenter au moins deux lampes Expired - Lifetime EP1705963B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005013898A DE102005013898A1 (de) 2005-03-24 2005-03-24 Schaltungsanordnung zum Betrieb mindestens einer ersten und einer zweiten darin einsetzbaren Lampe

Publications (3)

Publication Number Publication Date
EP1705963A2 true EP1705963A2 (fr) 2006-09-27
EP1705963A3 EP1705963A3 (fr) 2006-10-04
EP1705963B1 EP1705963B1 (fr) 2008-11-19

Family

ID=36593671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06005212A Expired - Lifetime EP1705963B1 (fr) 2005-03-24 2006-03-14 Circuit pour alimenter au moins deux lampes

Country Status (5)

Country Link
US (1) US7301292B2 (fr)
EP (1) EP1705963B1 (fr)
CN (1) CN1838851B (fr)
CA (1) CA2540414A1 (fr)
DE (2) DE102005013898A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6127788A (en) * 1997-05-15 2000-10-03 Denso Corporation High voltage discharge lamp device
JP4252117B2 (ja) * 1997-05-16 2009-04-08 株式会社デンソー 放電灯装置
JP3932773B2 (ja) * 2000-06-14 2007-06-20 松下電工株式会社 放電灯点灯装置
DE10108138A1 (de) * 2001-02-20 2002-08-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schutzschaltung für eine Leuchstofflampe
JP2002359093A (ja) * 2001-03-28 2002-12-13 Toshiba Lighting & Technology Corp 放電ランプ点灯装置および照明装置
US6465972B1 (en) * 2001-06-05 2002-10-15 General Electric Company Electronic elimination of striations in linear lamps
CN100450326C (zh) * 2002-07-16 2009-01-07 达方电子股份有限公司 驱动多支放电灯管的变流器
US6819063B2 (en) * 2002-12-13 2004-11-16 Bruce Industries, Inc. Sensing voltage for fluorescent lamp protection
JP4338123B2 (ja) * 2003-04-25 2009-10-07 スミダコーポレーション株式会社 放電灯駆動装置

Also Published As

Publication number Publication date
US7301292B2 (en) 2007-11-27
DE102005013898A1 (de) 2006-09-28
CN1838851B (zh) 2010-12-22
CN1838851A (zh) 2006-09-27
CA2540414A1 (fr) 2006-09-24
EP1705963A3 (fr) 2006-10-04
DE502006002093D1 (de) 2009-01-02
US20060214602A1 (en) 2006-09-28
EP1705963B1 (fr) 2008-11-19

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