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
  • H05B41/40—Controlling the intensity of light discontinuously
  • H05B41/42—Controlling the intensity of light discontinuously in two steps only
• • 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
  • H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
  • H05B41/2881—Load circuits; Control thereof
  • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
• • 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
• • 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
  • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
  • H05B41/3928—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation for high-pressure lamps, e.g. high-intensity discharge lamps, high-pressure mercury or sodium lamps
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

• the invention relates to a method for operating a high-pressure discharge lamp in a vehicle headlight and to an apparatus for operating a high-pressure discharge lamp in a vehicle headlight according to the preamble of patent claims 1 and 6.
• Such a method and such a device is disclosed for example in DE 39 05 715 AI.
• the ⁇ se specification describes a method of operating a high pressure discharge lamp in a vehicle headlight according to which the high-pressure discharge lamp is operated with a regulated ⁇ th rectangular current and an electrical output of 32 watts.
• the inventive method for operating a high pressure discharge lamp in a vehicle headlight includes fully control of the electric power of the high pressure discharge lamp during its operation after Beendi ⁇ supply the ignition phase to a constant level, whereby it ⁇ invention according to the electrical power of the high-pressure discharge lamp for generating a first illumination appli - Controlling to a first constant level and for generating a second lighting application to another, second constant level.
• the proportion of electrical power of the aforementioned components of the ignition or operating device in the determination of the active power of the high pressure discharge lamp does not considered. That is, the term electrical power of the high-pressure discharge lamp designates in this case the active power of the burner.
• burn- ers denotes the discharge vessel of the high-pressure discharge lamp with the enclosed therein gas discharge ⁇ electrodes and the discharge medium.
• ignition and start-up phase is the phase of operation of the high pressure discharge lamp ⁇ while the charge igniting the Gasent- in the high pressure discharge lamp and evaporating the filling ingredients in the interior of Entladungsgefä ⁇ SLI the high-pressure discharge lamp takes place and at the end of which a quasi-stationary operating state of the high pressure discharge lamp set.
• the encryption of the invention provides after completion of the ignition and start-up phase before a power control of the high pressure discharge lamp in two different, alternatively selectable constant Ni ⁇ veaus, to thereby realize the same two different lamp lighting applications ofppeschein- pitcher.
• the device according to the invention for operating a high-pressure discharge lamp in a vehicle headlamp has a power control unit which serves to control the electrical power of the high-pressure discharge lamp to a constant level after completion of the ignition and starting phase of the high-pressure discharge lamp, wherein means for controlling the electric power of the invention High-pressure discharge lamp to two different, alternatively selectable constant levels are provided.
• the high-pressure discharge lamp in the vehicle headlight for generating the two alternative lighting applications running lights and dipped beam or particularly preferred.
• the latter two Alternative illumination application Low beam and high beam are particularly preferred because for this purpose, the electric power of the high pressure discharge lamp must be slightly changed ge ⁇ slightly and the reflector in the vehicle headlight for these two lighting applications in a simple manner, for example by means of an on and off optical aperture or a similar acting light-guiding means, can be adjusted.
• a metal-halide high-pressure discharge lamp is used with mercury he ⁇ filling which contains metal halides also xenon at a high pressure in its filling.
• the xenon under high pressure ensures an immediate light emission of the high-pressure discharge lamp immediately after the ignition of the gas discharge in the discharge vessel of the high-pressure discharge lamp.
• the abandonment of mercury in the filling happens for ecological reasons.
• the electric power of the aforementioned type of high pressure discharge lamp is controlled in the vehicle headlamp according to Be ⁇ termination of the ignition and start-up phase to a constant value of not more than 25 watts to ensure that the High pressure discharge lamp in this operating mode produces a luminous flux of up to 2000 lumens in accordance with statutory regulations.
• This can be dispensed with a cleaning system for the vehicle headlights.
• the electric power of the aforementioned type of high-pressure discharge lamp in the vehicle headlamp after completion of the ignition and start-up phase to a constant value in the range of greater than 25 watts and less than or equal to 28 watts regulated to a higher luminous flux of about 2500 for the high beam
• a constant value in the range of greater than 25 watts and less than or equal to 28 watts regulated to a higher luminous flux of about 2500 for the high beam To provide lumens. It has namely been proven that in the aforementioned type of high pressure discharge lamp can be achieved by approximately 450 lumens by a raised stabili ⁇ hung the power level for only 3 Watt an increase in the luminous flux.
• the method according to the invention and the device according to the invention thus make it possible to realize two different, alternatively adjustable lighting applications, namely low beam and high beam, with one and the same high-pressure discharge lamp.
• procedural ⁇ ren and the inventive device include an optical shutter or light control means in the vehicle headlight, which operates in synchronism with the switching between the two alternatively adjustable power levels of the high-pressure discharge lamp and enabled or disabled who ⁇ to the two alternative adjustable illumination applications of the vehicle headlight to realize and in particular to allow optimal adaptation to the light distributions of low beam or high beam.
• the method according to the invention and the device according to the invention also have the advantage over the systems with separate light sources and headlamps for dipped beam and main beam that there is no delay when switching dipped beam to main beam and vice versa the light emission occurs because the same light source is used for both applications, which is already ⁇ on and is in a quasi steady state.
• the inventive device for operating a high pressure discharge lamp preferably comprises a performance-control unit, which can be switched between two alternative objects to ⁇ order to control the electric power of the high pressure discharge lamp in the first or the second alternative constant level. Thereby, the electrical ⁇ specific power of the high pressure discharge lamp for both Be ⁇ leuchtungsanorganizen can be controlled with one and the same power control unit.
• the regulation of the electrical power of the high-pressure discharge lamp is carried out according to the method and the device according to the invention in an advantageous manner to one of the variants explained below.
• the means for the electric power of the high pressure discharge lamp control to the two alternatively selectable constant level of a resistance element for detecting a proportional to the lamp current voltage whose resistance value is variable and preferably ⁇ switchable between two values This allows the usual Liehe be used in a known power control unit according to the prior art and further modified in a simple manner so that the invention shown SSE process can be carried out since the electric power of the high pressure discharge lamp is proportional to the Lamp current is and thus can be controlled by the lamp current. Therefore, by changing the resistance value of the aforementioned resistance element, the parameter of the electric power of the high-pressure discharge lamp detected by the power control unit is changed accordingly.
• the means for controlling the electric power of the high-pressure discharge lamp to the two alternatively selectable constant levels comprise a controller with switchable gain or characteristic.
• the means for controlling the electric power of the high-pressure discharge lamp to the at alternatively selectable constant levels a microcontroller with software implemented therein, which performs the switching between the two alternatively selectable constant power levels programmatically by generated according to the changed power level ver ⁇ changed setting values for power control.
• the power control unit of the inventive device is formed as part of an electronic ballast for operating the Hochlichentla ⁇ tion lamp, which has a first terminal for connecting the high-pressure discharge lamp to the ⁇ electronic ballast and a second terminal for power supply of the electronic ballast, the second Connection has at least three electrical contacts, which are connected in such a way with the power control unit that when using a first and second electrical contact for supplying power to the electronic ballast, the control of the electrical power of the high pressure discharge lamp is activated to the first constant level and when using the third electrical contact for supplying power to the electronic ballast, the regulation of the electrical power of the high pressure discharge lamp to the second constant level a is activated.
• an electronic ballast allows the use of transistors equipped with transistors to generate from the vehicle electrical system voltage required for lamp operation voltages and currents.
• the power control unit can thereby be designed in a particularly advantageous manner as a pulse width modulation unit, which performs the power control of the high-pressure discharge lamp via the pulse width-modulated control of the transistors of the voltage converter. Switching the power control of the high-pressure discharge lamp between the two alternatively selectable constant levels can be achieved in a particularly simple way by the use of different electrical contacts for the power supply of the electronic ballast are performed.
• the power ⁇ control to the first or the second constant level and thus for example the low beam or the far ⁇ light activated can be easily controlled via the light switch in the vehicle.
• the aforementioned optical shutter can be ak ⁇ tivated or deactivated synchronously. It proves to be advantageous that the wiring harness in the vehicle usually ⁇ already equipped with an additional electrical line for the high beam, which can be used here in a simple manner for connecting the aforementioned third electrical contact.
• the aforementioned electronic ballast has before ⁇ preferably a full-bridge inverter, in the bridge branch, the first terminals of electronic Before ⁇ are switching device arranged for the high pressure discharge lamp, and a flyback converter, whose voltage output is connected to the voltage input of the full bridge inverter.
• a flyback converter With the aid of the full-bridge inverter, the polarity of the lamp current is constantly reversed in order to prevent deposition of the charged ions of the discharge plasma on the gas discharge electrode of the high-pressure discharge lamp.
• the flyback converter makes it possible to get out of the Bordnet zschreib the vehicle to generate the lamp operation he ⁇ required voltages and currents.
• control of the electrical power of the high-pressure discharge lamp can be achieved by pulse width-modulated activation of the transistor of the flyback converter.
• the power control unit of he ⁇ inventive device is therefore preferably modulated as pulse width modulation unit for pulse-width control of a switching means of the flyback converter is excluded.
• Figure 1 is a schematic representation of a vehicle ⁇ headlight with the device according to the invention
• Figure 2 is a schematic representation of the electronic
• FIG. 3 is a schematic representation of the electronic
• Ballast and the high pressure discharge lamp of FIG. 1 including connections with light ⁇ control module
• FIG. 4 shows a block diagram of the electronic ballast of FIG. 1 in a diagrammatic view 5 shows a first disclosed embodiment of the power regulation unit of the elekt ⁇ tronic ballast shown in FIG. 4 is a schematic representation of
• FIG. 4 A second disclosed embodiment of the power regulation unit of the elekt ⁇ tronic ballast shown in FIG. 4 is a schematic representation of
• FIG. 7 shows a third disclosed embodiment of the power regulation unit of the elekt ⁇ tronic ballast shown in FIG. 4 is a schematic representation of
• FIG. 1 schematically shows a vehicle headlight with the device according to the invention for operating a high-pressure discharge lamp which serves as a light source in the vehicle headlight.
• This vehicle ⁇ headlights used to generate the low beam and the high beam of the vehicle.
• the vehicle headlight has a Hochdruckentla ⁇ tion lamp 1, which is surrounded by a reflector 2 and which is connected to an electronic ballast EVG.
• the reflector 2 and the high pressure discharge lamp 1 are designated in Figure 1 as “pro ection system”.
• the vehicle headlamp one designated as the “Lens” optical lens and as a "front glass” be ⁇ recorded transparent cover plate, through which the of the High-intensity discharge lamp 1 is emitted from the vehicle headlight, and between the reflector 2 and the optical lens “lens” is a "Shielding" designated optical aperture, which is activated to generate the low beam and in the beam path of the light generated by the high pressure discharge lamp 1 ge ⁇ switched to hide a portion of the light.
• the optical shutter is deakti ⁇ fourth and removed from the optical path of the generated from the high-pressure discharge lamp 1 light beispielswei ⁇ se by folding.
• the electronic ballast ECG is used to operate the high pressure discharge lamp 1. It generates from the vehicle electrical system voltage required for operating the high pressure discharge lamp 1 voltages and currents.
• the electronic ballast EVG is equipped with an electrical connection, which has three electrical contacts Kl, K2, K3, and preparedstat ⁇ tet with another terminal K4, which serves to connect the high-pressure discharge lamp 1 to the electronic ballast EVG.
• the second contact of the electrical connection of the electronic ballast ballasts are connected to the vehicle system voltage of the vehicle.
• the third contact K3 is used.
• the optical shutter "Shielding" is also deactivated via the third contact K3, that is to say the switching on of the high beam and the removal of the optical shield from the beam path of the light generated by the high-pressure discharge lamp 1 take place synchronously.
• FIGS. 2 and 3 two different ways of using the electrical contacts K1, K2 and K3 are shown electronic ballast electronic ballast schematically darge ⁇ represents.
• the electrical contacts Kl and K2 are used for voltage supply of the electronic ballast EVG to attest to the ER, the low beam, and for generating the high beam
• the elekt ⁇ step contacts Kl and K3 are used for voltage supply of the electronic ballast EVG.
• the elekt ⁇ innovative contact Terminal in both cases to ground potential. To switch between dipped beam and high beam is thus easily switched between the contact pairs Kl, K2 and Kl, K3 to power the electronic ballast ECG, for example by means of the light switch in the cockpit of the vehicle.
• connection K4 for the high-pressure discharge lamp 1 is likewise formed with three wires. Two wires of the connection or connecting cable K4 are used for supplying voltage to the high pressure discharge lamp 1 for operating the high-pressure discharge lamp ⁇ after completion of the ignition phase both in the operating mode and in the low beam operating mode main beam.
• the third wire of the terminal K4 is used to connect the pulse ignition device (not shown) to the high-pressure discharge lamp and to ⁇ lead the ignition voltage required for igniting the gas discharge to the high-pressure discharge lamp, which is generated by means of the pulse ignition during the ignition phase.
• a light control module LM is provided, which is arranged between the positive pole of the vehicle electrical system voltage +12 V of the vehicle and the electrical contacts Kl, K2 of the electronic ballast ECG.
• the electronic ballast is powered by its electrical contacts Kl and K2 ⁇ rule with voltage.
• Zu ⁇ additional use of the third electrical contact K3, that is, by the third electrical contact K3 is subjected to a voltage above a predetermined threshold value the switching from low beam to high beam is effected.
• the switching back from high beam to low beam is done accordingly by Abschal ⁇ th the aforementioned additional voltage at the third contact K3.
• the connection K4 for the high-pressure discharge lamp 1 is identical to the connection K4 shown in FIG.
• the electronic ballast has an input filter "Input filter” including protection against polarity reversal or permutation of the electrical contacts Kl, K2, K3 of the electronic ballast EVG when connecting to the vehicle electrical system voltage ⁇ ⁇ of the vehicle, a flyback 1 "fly back converter” , a full bridge inverter “full bridge inverter”, a regulator “regulator”, a pulse width modulator “PWM unit”, a control unit “control unit” and a driver circuit “inverter driver” for the transistors of the full bridge inverter ⁇ called components of the electronic ballast explained in more detail.
• the flyback converter “fly back converter” is connected downstream of the input filter “input filter”, which serves as a DC voltage converter and is powered by the vehicle's electrical system voltage. generated from 12 V or 24 V DC voltage of a maximum of 400 V, which is provided to the DC link capacitor CK at the voltage output of the flyback converter.
• the full-bridge inverter “full bridge inverter” is connected to the intermediate circuit capacitor CK, the voltage applied to the intermediate circuit capacitor CK serving as the input voltage to the full-bridge inverter.
• the r Qc switch synchronously and the transistor pairs alter ⁇ nierend, so that the lamp current over the discharge Stre ⁇ bridge "Load (Burner)" the high pressure discharge lamp 1, either flowing through the first pair of transistors Q A, Q D, or by the second pair of transistors Q B, Q c.
• the Po ⁇ larity of the lamp current with the switching frequency of the Tran ⁇ sistoren the full-bridge inverter is changed.
• the order ⁇ poles of lamp current is used to prevent the ground tion of ion of the discharge plasma to the Gasentla ⁇ dung electrodes of the high pressure discharge lamp 1.
• the switching operations of the transistors Q A, Q B, Q c QD of the full ⁇ bridge inverter are using the driver scarf ⁇ tung "inverter driver” and the carried out the control unit "control unit”.
• the ignition phase of the high-pressure discharge lamp ⁇ 1 is at the intermediate circuit capacitor CK of the flyback converter the max Imale output voltage of 400 V provided. It serves to supply power to the aforementioned pulse ignition device (not shown), which is also connected in the bridge branch of the full-bridge inverter during the ignition phase and ignites voltage pulses of up to 30 kV for igniting the Gasent ⁇ charge generated in the discharge vessel of the high pressure discharge lamp.
• the in ⁇ pulse igniter is deactivated and the DC link capacitor CK only a voltage of about 45 V is provided, which corresponds to the burning voltage of Hochlichentla ⁇ tion lamp 1.
• the high pressure discharge lamp 1 With two to three times their rated power, to a quick evaporation of the filling ingredients in the discharge vessel of the high pressure discharge lamp and a fast transition to a quasi-stationary operating state of the high-pressure discharge lamp 1, in which all filling components are gaseous and participate in the discharge.
• the electric power of the high-pressure discharge lamp 1 is regulated to one of two available, alternatively selectable, constant levels by means of the "regulator” regulator, the pulse width modulator “PWM unit” and the control unit “control unit” the electric power of the high pressure discharge lamp 1 is controlled after completion of the ignition and start-up phase of a first Ni ⁇ veau of 25 watts.
• the "regulator” regulator the pulse width modulator "PWM unit”
• control unit control unit
• the high pressure discharge lamp 1 is ei ⁇ ne halogen metal vapor high-pressure discharge lamp with a mercury-free filling, iodide, the sodium, Scandiumjo- did, zinc iodide and indium iodide, and xenon as a filling corresponds zinc iodide takes on the role of missing Mercury ⁇ bers and a high xenon pressure in the range of 0.6 to 1.2 megapascals at a temperature of 22 ° C allows the immediate light emission immediately after the ignition of the gas discharge.
• the rated power of this high-pressure discharge lamp 1 is 25 watts.
• the electrical power of this high ⁇ pressure discharge lamp 1 is regulated after completion of the ignition and on ⁇ running phase to a second level of 28 watts.
• the high-pressure discharge lamp 1 generates a luminous flux of approximately 2500 lumens.
• the optical shutter "Shielding" (Fig. 1) is disabled, that is, removed from the beam path of the discharge lamp of the Hochdruckentla- 1 emitted light.
• the regulation of the electrical power of the high-pressure discharge lamp 1 is carried out by means of the power control unit, which essentially comprises the regulator “regulator”, the pulse width modulator “PWM unit”, the control unit “control unit” and a measuring resistor R S H / der am Voltage output of the flyback converter is arranged, be ⁇ stands.
• the controller "regulator” includes aistsreg ⁇ ler VEA and a current regulator CEA.
• the voltage regulator VEA is up to the ignition of the gas discharge in the high-pressure discharge lamp 1 active With the aid of a maximum voltage of 400 V is generated at the intermediate circuit capacitor CK to.
• the current controller CEA is designed as a proportional-integral controller for the lamp current I L.
• the control unit "control unit” and the microcontroller integrated in it generate control values for the aforementioned proportional-integral controller for controlling the lamp current, and the microcontroller also monitors the voltage V L in the bridge arm of the full-bridge inverter High-pressure discharge lamp 1 ent ⁇ speaks, and generated in dependence on the aforementioned voltage V L and the voltage across the measuring resistor R S H control values for the current controller CEA, so that means of the current controller CEA de facto control of the electrical power of the high-pressure discharge lamp is made possible.
• the control output of the proportional-integral controller "regulator” is connected to the pulse width modulator "PWM unit". essentially consisting of a frequency generator “f-generator”, a comparator “Comp” and a flip-flop.
• the pulse width modulator “PWM unit” performs a pulse width modulated actuation of the transistor Q1 of the flyback converter “fly back converter” as a function of the regulator signal. Control modulated by this pulse width regulates the electric power of the high-pressure discharge lamp 1 to a constant level of 25 watts, with the aid of the measuring resistor R SH at the node K between the measuring resistor R SH and the intermediate circuit capacitor CK being proportional to the lamp current I L Voltage is tapped.
• the switching to the higher power level of 28 watts is done either by altering the effective advertising tes of measuring resistor R SH (FIG. 6) or the Re ⁇ gel characterizing of the lamp current controller CEA (FIG. 5) or by changing the effective resistance of the resistor R6 (FIG. 7) at the output of the current regulator ⁇ CEA.
• the current regulator CEA has an operational amplifier Ui and resistors R1, R2, R3, R5 and R6 and a capacitor C5.
• the resistor R5 and the capacitor C5 are active in the feedback branch of the operational amplifier Ul from its output to its inverting input.
• the resistor R4 in the feedback branch of the operational amplifier Ul connected.
• the control characteristic of the regulator "regulator” is changed so that, with suitable dimensioning of the components, the electric power of the high-pressure discharge lamp is regulated to the higher level of 28 W.
• the connection of the resistor R4 arranged parallel to the low-pass filter R5, C5 is effected by means of the electronic switch Sl is triggered via the third electrical contact K3 of the electronic ballast EVG. By using or voltage supply of the third electrical contact K3, the electronic switch Sl is closed and thus the high beam on ⁇ on.
• the effective value of the measurement resistor R S H is changed instead of the feedback ⁇ branch of the operational amplifier Ul to place the first power level of 25 watts, the second power level for the regulation of the electric power of the high-pressure - to activate discharge lamp 1.
• a further resistor R S H2 is arranged, which can be switched on or off by means of the electronic switch S2. In the switched-off state, only the measuring resistor R S H is active and the electrical power of the high- Discharge lamp 1 is controlled after completion of the ignition and start-up phase to the first constant level of 25 watts.
• the electric power of the high-pressure discharge lamp 1 is regulated to the higher level of 28 watts by means of the pulse width modulator "PWM unit.”
• PWM unit pulse width modulator
• the switching between the first and second constant level of 25 watts and 28 watts for the regulation of the electrical power of the high pressure discharge lamp 1 by means of the microcontroller of the control unit "control unit" and is implemen ⁇ oriented software can be realized by the microcontroller for the two different power levels of 25 W or 28 W correspondingly generates different actuating values for the power control unit.
• the invention is not limited to the above-described embodiments of the invention.
• the electric power see the high-pressure discharge lamp can also be controlled to another constant level than 28 watts to generate an even higher or slightly lower luminous flux.
• Each additional watt of power above 25 watts increases the luminous flux of the high-pressure discharge lamp by approx. 150 lumens.

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• Lighting Device Outwards From Vehicle And Optical Signal (AREA)
• Circuit Arrangements For Discharge Lamps (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

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ID=45001717

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• 2010
  • 2010-11-10 DE DE102010043725A patent/DE102010043725A1/de not_active Withdrawn
• 2011
  • 2011-11-07 KR KR1020137014867A patent/KR20130116283A/ko not_active Application Discontinuation
  • 2011-11-07 WO PCT/EP2011/069504 patent/WO2012062690A2/de active Application Filing
  • 2011-11-07 EP EP11785362.2A patent/EP2638787A2/de not_active Ceased

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