EP2026639A1 - Circuit destiné à régler la hauteur d'une puissance de lampes à décharge - Google Patents

Circuit destiné à régler la hauteur d'une puissance de lampes à décharge Download PDF

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Publication number
EP2026639A1
EP2026639A1 EP07114141A EP07114141A EP2026639A1 EP 2026639 A1 EP2026639 A1 EP 2026639A1 EP 07114141 A EP07114141 A EP 07114141A EP 07114141 A EP07114141 A EP 07114141A EP 2026639 A1 EP2026639 A1 EP 2026639A1
Authority
EP
European Patent Office
Prior art keywords
capacitor
current source
gas discharge
voltage
circuit arrangement
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Withdrawn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
EP07114141A
Other languages
German (de)
English (en)
Inventor
Stefan Möller
Wolfgang Daub
Radtke Volker
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Priority to EP07114141A priority Critical patent/EP2026639A1/fr
Publication of EP2026639A1 publication Critical patent/EP2026639A1/fr
Withdrawn legal-status Critical Current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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • H05B41/386—Controlling the intensity of light during the transitional start-up phase for speeding-up the lighting-up

Definitions

  • the invention relates to a circuit arrangement for adjusting the level of an additional power of gas discharge lamps of motor vehicle headlights with a capacitor whose voltage is antiproportional to the additional power, and having a first terminal to which the voltage of the capacitor can be tapped
  • the device comprises an ignition device to which the high-pressure gas discharge lamp is connected.
  • the ignition device is connected to an AC voltage generator, which provides the necessary energy for the operation of the gas discharge lamp.
  • a current and a voltage measuring device are provided in the circuit of the lamp.
  • a comparator is connected to the power actual determination device and to the AC voltage generator.
  • the comparator is connected to a power setpoint determining device, from which the desired value for the power (target power) of the gas discharge lamp and thus also the additional power for the gas discharge lamp is specified.
  • the target power is compared with the actual power and, depending on the result of the comparison, a manipulated variable is generated with which the alternating voltage generator is driven.
  • the target power is different for the same actual power from the time of operation of the gas discharge lamp.
  • the lamp Depending on whether the lamp is in a steady state Condition (steady state) or in a transient phase (switch-on) is or not, the lamp has other electrical characteristics, which are reflected directly in different lighting behavior.
  • the lamp in the steady state as well as in the transient phase it is necessary to change the power of the lamp from the switch-on time to the steady state. Compared to the power required in the steady-state condition, additional power is required, which has previously been described as an additional service.
  • the circuit arrangement for determining the amount of additional power comprises, in addition to the capacitor as a circuit of the capacitor, a voltage source and a first ohmic resistor for charging the capacitor and a second resistor for discharging the capacitor.
  • the circuit arrangement has a connection, to which a signal can be tapped, which indicates the level of the power setpoint.
  • the invention is based on the object of a circuit arrangement for adjusting the amount of additional power of gas discharge lamps of motor vehicle headlights simpler and in particular to design with fewer components and with fewer lines.
  • the circuit arrangement comprises a current source which is suitable and adapted for charging the capacitor, and that the current source is parallel to the capacitor.
  • An ohmic resistor for discharging the capacitor may be connected in parallel with the capacitor and the power source.
  • the power source can be switched on and off.
  • the height of the charging current may optionally be adjustable.
  • the circuit arrangement and in particular the current source can be adapted and set up to better match the power to the luminous flux of the gas discharge lamp. The adaptation can take place in temporal sections.
  • the circuit arrangement, in particular the current source for overdriving suitable and be adapted to compensate for leakage currents that may occur on the capacitor.
  • the voltage is reduced by a capacitor given the additional voltage and discharged when the vehicle headlight off the capacitor via a resistor, while the motor vehicle headlight a current source charges the capacitor.
  • the in the FIG. 1 illustrated circuit arrangement according to the invention has a current source G1, which is connected in parallel with a capacitor C1 and an ohmic resistance.
  • the one common potential GND of the capacitor C1, the resistor R1 and the current source G1 is the ground potential, while the other potential CA is connected to a terminal for tapping the charging voltage of the capacitor C1.
  • an operational amplifier circuit which may be a voltage follower circuit.
  • the power source can be turned on and off.
  • the current source G1 When the current source G1 is turned on, a current is impressed on the parallel circuit of the capacitor C1 and the resistor R1, with which the capacitor C1 is charged.
  • the steadily increasing voltage across the capacitor C1 leads to a raising of the potential CA and thus to an increase of the voltage for the operational amplifier circuit or to an increase of the reduction of the additional power.
  • the capacitor C1 In the off state of the current source, the capacitor C1 is discharged via the resistor R1, resulting in a decrease of the potential CA, whereby the circuit arrangement is returned to the initial state before switching on the power source or the lamp.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP07114141A 2007-08-10 2007-08-10 Circuit destiné à régler la hauteur d'une puissance de lampes à décharge Withdrawn EP2026639A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07114141A EP2026639A1 (fr) 2007-08-10 2007-08-10 Circuit destiné à régler la hauteur d'une puissance de lampes à décharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07114141A EP2026639A1 (fr) 2007-08-10 2007-08-10 Circuit destiné à régler la hauteur d'une puissance de lampes à décharge

Publications (1)

Publication Number Publication Date
EP2026639A1 true EP2026639A1 (fr) 2009-02-18

Family

ID=38871803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07114141A Withdrawn EP2026639A1 (fr) 2007-08-10 2007-08-10 Circuit destiné à régler la hauteur d'une puissance de lampes à décharge

Country Status (1)

Country Link
EP (1) EP2026639A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415496A2 (fr) * 1989-08-31 1991-03-06 Philips Patentverwaltung GmbH Circuit pour alimenter une lampe à décharge
EP0459126A1 (fr) * 1990-05-14 1991-12-04 Hella KG Hueck & Co. Procédé et dispositif pour l'amorçage d'une lampe à décharge haute pression dans des véhicules
EP0534280A1 (fr) * 1991-09-21 1993-03-31 Hella KG Hueck & Co. Ballast pour faire démarrer et mettre en service des lampes de décharge à gaz à haute pression
DE19723625A1 (de) * 1996-06-07 1997-12-11 Koito Mfg Co Ltd Lichtstromkreis für Entladungslampe
DE102004032187A1 (de) * 2003-07-02 2005-03-10 Koito Mfg Co Ltd Entladungslampe-Erregungsschaltung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415496A2 (fr) * 1989-08-31 1991-03-06 Philips Patentverwaltung GmbH Circuit pour alimenter une lampe à décharge
EP0459126A1 (fr) * 1990-05-14 1991-12-04 Hella KG Hueck & Co. Procédé et dispositif pour l'amorçage d'une lampe à décharge haute pression dans des véhicules
EP0534280A1 (fr) * 1991-09-21 1993-03-31 Hella KG Hueck & Co. Ballast pour faire démarrer et mettre en service des lampes de décharge à gaz à haute pression
DE19723625A1 (de) * 1996-06-07 1997-12-11 Koito Mfg Co Ltd Lichtstromkreis für Entladungslampe
DE102004032187A1 (de) * 2003-07-02 2005-03-10 Koito Mfg Co Ltd Entladungslampe-Erregungsschaltung

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