EP1973388A1 - Leuchtenvorschaltgerät - Google Patents

Leuchtenvorschaltgerät Download PDF

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Publication number
EP1973388A1
EP1973388A1 EP07300882A EP07300882A EP1973388A1 EP 1973388 A1 EP1973388 A1 EP 1973388A1 EP 07300882 A EP07300882 A EP 07300882A EP 07300882 A EP07300882 A EP 07300882A EP 1973388 A1 EP1973388 A1 EP 1973388A1
Authority
EP
European Patent Office
Prior art keywords
ballast
luminaire
supply means
studs
fluorescent 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.)
Withdrawn
Application number
EP07300882A
Other languages
English (en)
French (fr)
Inventor
Luc Matis De Bisschop
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.)
Distribution De Materiel D'eclairage - Luxbox Ste
Original Assignee
Distribution De Materiel D'eclairage - Luxbox Ste
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 Distribution De Materiel D'eclairage - Luxbox Ste filed Critical Distribution De Materiel D'eclairage - Luxbox Ste
Priority to EP07300882A priority Critical patent/EP1973388A1/de
Publication of EP1973388A1 publication Critical patent/EP1973388A1/de
Withdrawn legal-status Critical Current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
    • H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp 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
    • H05B41/295—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
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation

Definitions

  • the present invention relates to the field of ballasts for circuits powering fluorescent lamp.
  • the invention applies particularly to such ballast implementing current feedback allowing power control by varying switching frequency during lamp burning in order to perform a dimming function for said fluorescent lamp.
  • Ballasts are optionally implemented using analog components like capacitors and resistors or using digital controllers.
  • Ballasts having a dimming function often implement digital and analog components.
  • ballasts enable the fluorescent lamp to be preheated before lightning.
  • Such preheating is managed by taking into account the characteristics of the lamp, said analog and digital components being calculated in function.
  • ballasts do not enable to protect the lamp from blackening during utilization.
  • ballasts are generally able to protect said microcontroller in case of failing of the fluorescent lamp (filament breakage etc.)
  • An object of the invention is to prevent blackening of the fluorescent lamp by providing the ballast of the invention with a specific combination of components.
  • the invention provides a luminaire ballast comprising a connector presenting four studs to plug a fluorescent lamp comprising two filaments, said connector being linked, through at least a ballast inductor, to supply means dedicated to provide a current feedback allowing power control by varying switching frequency during lamp burning in order to perform a dimming function for said fluorescent lamp, said ballast being characterized in that the two studs dedicated to be connected to a same filament are connected to a same electrical point, one of the both studs being further provided with a supplementary inductor dedicated to be in serial between said electrical point and the corresponding filament of said fluorescent lamp when said lamp is plugged on the studs.
  • the supply is provided to the ballast inductor but also to the supplementary inductor connected to the other filament.
  • the supply means for example implementing a microcontroller, have a normal functioning without any risk of overheat.
  • the invention proposes a derivation circuit in case of failure of fluorescent lamp.
  • supplementary inductors enables to have a supplementary parameter to adjust the preheating characteristics.
  • the two electrical points are connected to each other through a capacitor.
  • This configuration enables to assure an optimal derivation circuit when the fluorescent lamp fails.
  • the supply means are looped on inductors and on the capacitor enabling to optimize the derivative behavior.
  • said two supplementary inductors share a same ferrite core.
  • said ferrite core is also common with the ballast inductor.
  • the electrical point that is connected to the positive output of supply means is also connected to an overload pin of said supply means.
  • This feature enables to additionally drain a excess of energy in the case where the derivative circuit of the invention is revealed not to be sufficient to drain the totality of the energy.
  • Such a feature is particularly used when a breakage occurs when full power is supplied to said fluorescent lamp.
  • said supply means are a specific integrated circuit.
  • the invention also concerns a luminaire comprising a luminaire ballast according to the invention, supply means dedicated to provide a current feedback allowing power control by varying switching frequency during lamp burning in order to perform a dimming function for said fluorescent lamp and a power factor correction stage.
  • said power factor correction stage and at least part of said supply means being deported in a control device connected by wire to said ballast, said luminaire further comprises an electromagnetic compatibility module adapted in relation with characteristics of said wire.
  • FIG. 1 shows an embodiment of a lamp-control circuit as implemented in a ballast 10 according to the invention.
  • Said ballast 10 is intended to control the functioning of a dimmable fluorescent lamp 11 connected to a connector 1 provided on said ballast 10 and presenting at least four studs 21, 22, 23, 24.
  • Said fluorescent lamp 11 comprises two filaments F1 and F2 each being connected by their two extremities to two of said studs, respectively 21, 22 and 23,24.
  • the two studs 21, 22 or 23, 24 dedicated to be connected to a same filament F1 or F2 are connected to a same electrical point P1 or P2.
  • One of the both studs 21, 22 or 23, 24 is further provided with a supplementary inductor L1 or L2 dedicated to be in serial between said electrical point P1 or P2 and the corresponding filament F1 or F2 of said fluorescent lamp 11 when said lamp 11 is plugged on the studs 21, 22, 23, 24.
  • said two points P1 and P2 are connected through a capacitor C.
  • Said ballast 10 further comprises supply means 3 and transistors Qa and Qb dedicated to provide a current feedback allowing power control by varying switching frequency during lamp burning in order to perform a dimming function for said fluorescent lamp 11.
  • Transistors Qa and Qb are driven by driver signals output from supply means 3. They consequently deliver an output voltage.
  • inductors L1, L2 and capacitor C that constitute a resonant circuit.
  • Said dimmable fluorescent lamp 11 is part of this resonant circuit.
  • said resonant circuit is able to absorb and to derive the electrical energy provided by said supply means 3 and transistors Qa and Qb without creating any damage to said supply means 3 or to transistors Qa and Qb.
  • FIG. 2 shows a particularly interesting embodiment wherein said supply means are constituted by a microcontroller 30 especially programmed to manage the dimming of a lamp 11 connected to connector 1 by varying switching frequency.
  • Said microcontroller 30 has among others a pin LVG (for "Low Side Driver Output”) dedicated to be connected to the low side power MOSFET transistor Qb gate of the half bridge.
  • HPV High Side Driver Output
  • Said microcontroller 30 also comprises a pin EN1 (for enable 1) dedicated to force the microcontroller in a latched shutdown state.
  • Said microcontroller thus functions as in the under voltage conditions.
  • Said pin EN1 is connect to the lamp connector 1 through at least a diode D1 and a resistor R4.
  • a circuit R5,C5 is advantageously placed at the entrance of pin EN1 in order to amortize the peaks (damping phenomenon).
  • Resistors R1, R2 and R3 are participating in the resonant circuit with Lbal, L1, L2, C1 and Cbal by looping the circuit in order not to damage said microcontroller 30 in case of overload.
  • Said inductors Lbal, L1 and L2 are advantageously implemented on the same ferrite core in order to assure a synchronized functioning.
  • Figure 3 is detailing a complete circuit for a luminaire constructed with a ballast 10 of the invention.
  • Said circuit further comprises a power factor corrector module 12 connected to supply means 3.
  • Said supply means are further connected to a variation device 13 able to communicate a variable signal to supply means 3.
  • Said variable signal is such that said supply means 3 modify the switching frequency provided to said fluorescent lamp 11.
  • the power factor correction module 12 is classically connected to a diode bridge 14.
  • said diode bridge is further connected to an electromagnetic compatibility (EMC) device 15.
  • EMC electromagnetic compatibility
  • Said EMC device comprises several stages adapted in function of the electromagnetic characteristic of the different wires used to connect the different part of the luminaire.
  • the wire between the different parts of the luminaire can behave like an antenna and provoke interferences in the luminaire (scintillation effect) or with external devices (TV set, radio).
  • the presented EMC device 15 is adapted for such a context and is constituted of three low-band pass filters.
  • a lightning arrester LA is advantageously implemented for protection peak voltage electrical.
EP07300882A 2007-03-20 2007-03-20 Leuchtenvorschaltgerät Withdrawn EP1973388A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07300882A EP1973388A1 (de) 2007-03-20 2007-03-20 Leuchtenvorschaltgerät

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07300882A EP1973388A1 (de) 2007-03-20 2007-03-20 Leuchtenvorschaltgerät

Publications (1)

Publication Number Publication Date
EP1973388A1 true EP1973388A1 (de) 2008-09-24

Family

ID=38283099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07300882A Withdrawn EP1973388A1 (de) 2007-03-20 2007-03-20 Leuchtenvorschaltgerät

Country Status (1)

Country Link
EP (1) EP1973388A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2079288A3 (de) * 2008-01-10 2012-12-05 Ralf Kleinodt Elektronisches Vorschaltgerät sowie Schaltungsanordnung zum Dimmen von Gasentladungslampen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5969483A (en) * 1998-03-30 1999-10-19 Motorola Inverter control method for electronic ballasts
US6232727B1 (en) * 1998-10-07 2001-05-15 Micro Linear Corporation Controlling gas discharge lamp intensity with power regulation and end of life protection
EP1675442A2 (de) * 2004-12-27 2006-06-28 Osram-Sylvania Inc. Vorschaltgerät mit Heizwendelsteuerungsschaltung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5969483A (en) * 1998-03-30 1999-10-19 Motorola Inverter control method for electronic ballasts
US6232727B1 (en) * 1998-10-07 2001-05-15 Micro Linear Corporation Controlling gas discharge lamp intensity with power regulation and end of life protection
EP1675442A2 (de) * 2004-12-27 2006-06-28 Osram-Sylvania Inc. Vorschaltgerät mit Heizwendelsteuerungsschaltung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2079288A3 (de) * 2008-01-10 2012-12-05 Ralf Kleinodt Elektronisches Vorschaltgerät sowie Schaltungsanordnung zum Dimmen von Gasentladungslampen

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