WO2003107723A1 - Circuit d'alimentation electrique pour phares de vehicule a moteur - Google Patents

Circuit d'alimentation electrique pour phares de vehicule a moteur Download PDF

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Publication number
WO2003107723A1
WO2003107723A1 PCT/IB2003/002217 IB0302217W WO03107723A1 WO 2003107723 A1 WO2003107723 A1 WO 2003107723A1 IB 0302217 W IB0302217 W IB 0302217W WO 03107723 A1 WO03107723 A1 WO 03107723A1
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WO
WIPO (PCT)
Prior art keywords
voltage
circuit
lamps
lamp
input
Prior art date
Application number
PCT/IB2003/002217
Other languages
English (en)
Inventor
Boris Ziller
Mario Linke
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N.V.
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 Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N.V. filed Critical Philips Intellectual Property & Standards Gmbh
Priority to AU2003240175A priority Critical patent/AU2003240175A1/en
Publication of WO2003107723A1 publication Critical patent/WO2003107723A1/fr

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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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/044—Controlling the light-intensity of the source continuously
    • H05B39/047—Controlling the light-intensity of the source continuously with pulse width modulation from a DC power source
    • 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 power supply circuit for motor vehicle lamps and a headlamp with a power supply circuit.
  • incandescent lamps In the automotive sector, lighting is still primarily provided by incandescent lamps.
  • tungsten-halogen incandescent lamps for instance as single- or twin-filament lamps, such as the known "H4" lamp or the "H7" lamp. These lamps are used for the exterior lighting of the motor vehicle, i.e. as sidelights, dipped-beam, main-beam or fog lamps for instance.
  • Incandescent lamps are also used as indicator lights (brake lamps, flashing indicators).
  • the known incandescent lamps are designed for operation with a fixed voltage. By virtue of the fixed resistance, they consume their nominal power at nominal voltage.
  • the lamps are hereby designed in such a way that operation at nominal voltage is optimum in respect of various requirements, especially in respect of service life.
  • the power supply for the lamps is provided via the vehicle's electrical system, which is supplied from the alternator (backed up by a battery).
  • the motor vehicle electrical system in modern motor vehicles operates at a nominal voltage of 12 V.
  • the regulators used in motor vehicles are generally set to an end-of-charge voltage of 13.2 V, with which the lamps are supplied as a maximum.
  • the lamps are grouped together in headlamp units for instance, wherein multiple lamps with one or more reflectors form a headlamp.
  • the lamps are connected via electrical wiring directly to a switch, which switches the on-board voltage.
  • the voltage present at a lamp does not correspond precisely with the nominal voltage or the end-of-charge voltage for which the lamps are designed. This results from, for instance, voltage losses in the area of the switch and the supply lead. Although the discrepancies are small, they lead to operation of the lamp outside the nominal range, and therefore under conditions for which it may not be optimized. This may, for instance, have a negative effect on the service life of the lamp.
  • DE-A-195 01 925 is a power supply circuit for motor vehicle lamps that enables operation of a lamp designed for a low nominal voltage (12 V) in a motor vehicle electrical system with a higher voltage level (24 V).
  • the circuit has a voltage input for an on-board motor vehicle voltage and multiple voltage outputs for the connection of lamps.
  • a switching device intermittently connects the voltage output to the voltage input. It thereby supplies the lamps with a pulse-width-modulated voltage.
  • the pulse duty ratio is hereby permanently set in such a way that each lamp consumes its nominal power in the time mean. It is stated that, by virtue of the thermal inertia of the lamps at the applied frequency of 60 to 70 Hz, a uniform luminance impression is gained.
  • the switching device comprises a transistor circuit triggered by an oscillator with a periodic clock signal, so the fixed pulse duty ratio is adhered to.
  • the known circuit can, however, be used only for a particular purpose, namely the operation of a 12 V lamp in a 24 V motor vehicle electrical system. It supplies a voltage with an r.m.s. value that lies in a fixed ratio to the input voltage.
  • the power supply circuit in accordance with the invention comprises a device for measuring voltage at the voltage input. This measured voltage is compared with a predefined nominal voltage at the voltage output. A conversion pulse duty ratio is set according to the results of this comparison. The switching device intermittently connects the voltage output to the voltage input in accordance with the stipulated conversion pulse duty ratio. At the voltage output, a pulse-width-modulated voltage occurs with a pulse duty ratio depending on the input voltage.
  • a lamp connected at the voltage output is permanently operated with a power that it would consume in the case of a constant supply with nominal voltage, i.e. at its nominal power.
  • nominal voltage is the optimum and has a positive effect on, for instance, the service life of the lamp.
  • the power supply circuit can operate in an extremely broad range of input voltages.
  • a power supply circuit of this kind and a headlamp with a power supply circuit of this kind, in which the nominal voltage can be set at, for instance, 12 V, can be operated in both a 12 V and a 42 V motor vehicle electrical system.
  • the conversion pulse duty ratio (the ratio of the on-period to the overall length of the time interval in question) is defined at just over 8%.
  • the conversion pulse duty ratio would be 100%, i.e. the voltage output and input are constantly connected. A connected lamp could thus always consume its nominal power, irrespective of the on-board voltage.
  • the switching device would, in principle, have no function. Nevertheless, this would open up the possibility of using a headlamp equipped with the power supply circuit for various electrical systems without modification for motor vehicles.
  • incandescent lamps with a pulse-width-modulated voltage rather than with direct voltage has proved unproblematic. Smoothing of the voltage is not necessary.
  • a switching frequency in the range from 100 to 300 Hz is proposed.
  • the lower limit of the useful range is determined, on the one hand, by the optical perceptibility of the intermittent triggering, and on the other by the possible effects of this on the service life of the lamp. EMC considerations, among others, play a part as regards the upper limit.
  • acoustic effects are associated with the pulse triggering of incandescent lamps. However, these are still insignificant below 300 Hz.
  • a frequency between 150 and 200 Hz has proved an especially good compromise between the various requirements.
  • Especially preferred is a switching frequency of approximately 200 Hz.
  • the circuit comprises a control device which determines the conversion pulse duty ratio from the measured value of the voltage at the voltage input and the predefined nominal voltage at the voltage output.
  • This control device may be, for instance, a microcontroller.
  • the control device determines the voltage ratio by division of the nominal voltage by the measured input voltage.
  • the conversion pulse duty ratio is preferably defined essentially as the square of the voltage ratio. It may, however, differ slightly, e.g. 10%, from the exact value in order to compensate for effects such as fast rise times, losses etc.
  • An especially simple structure can be achieved if the switching device is in the form of an electronic switch - for example with a FET as the switching element - which is directly triggered through outputs of a microcontroller.
  • the use of integrated modules with FET switches and control electronics allows a simple structure. Because power drivers are dispensed with, sufficiently fast rise times can be achieved, so losses remain small.
  • a power supply circuit of this kind can be used, in particular, in a headlamp unit with multiple lamps. It is hereby advantageous if the control device is equipped with a status memory for the status of each lamp connection (i.e. the information regarding whether the associated lamp is to be switched on or off). In this case, a constant control signal that is permanently present at every instant (i.e. a direct electrical lead per lamp) is no longer necessary for every lamp. Instead, the circuit can be triggered via a separate control input, i.e. one that is independent of the power supply with the on-board voltage, via which commands to switch individual lamps on or off can be received.
  • the control unit may here comprise a CANBUS transceiver. Not just a control input, but also an output for sending signals is thus made available.
  • the control device may have facilities for error diagnosis, wherein detected errors can be indicated via an output (e.g. CANBUS). Possible error states may be lamp defects (short circuit or no-load operation). Temperature monitoring may also be provided. Exceeding a temperature source may be emitted as an error indication, and/or reaction to it may be in the form of switching off at least one of the lamps.
  • the circuit preferably operates at fixed time intervals. At the preferred switching frequency of 200 Hz, for example, a time interval of this kind has a duration of 5 ms. A measurement of the input voltage preferably takes place in each of the successive time intervals. A very rapid matching to fluctuations of the input voltage is thereby available.
  • the voltage pulses at the various outputs are distributed within the particular time interval, i.e. at least the switch-on times of two different lamp connections differ within an interval. This leads to an improved distribution of the load on the motor vehicle electrical system supplying the lamp input. It is preferred if the voltage pulses are generated completely sequentially at the outputs, i.e. do not overlap in terms of time, or do so only slightly. However, conditions may occur under which strongly sequential distribution cannot be guaranteed. In this case, it is proposed that the outputs be grouped together, wherein the triggering of the groups takes place sequentially.
  • One embodiment of the invention provides for a preheating of one or multiple lamps when they are not “switched on", i.e. are not intended to light up.
  • the "switched off lamps are triggered with minimum power, i.e. minimum pulse duty ratio.
  • the pulse duty ratio hereby lies, for instance, below 3%, preferably at approximately 1%.
  • This preheating has a positive effect on the service life of the lamp. Lamp failure through "burn-out" of the incandescent filament is frequently a result of mechanical rupture, which is caused by the initially high current through the cold filament when an incandescent lamp is switched on.
  • the filament is brought to an elevated temperature, so, on a subsequent "switch-on", i.e. operation at nominal power, the incandescent filament already has an elevated electrical resistance and the current then flowing is limited. With preheating of this kind, the service life of the lamps can be extended.
  • Fig. 1 shows a schematic circuit diagram to explain the principle of the power supply circuit in accordance with the invention
  • Fig. 2 shows a diagram of the time curve of a pulse-width-modulated voltage
  • Fig. 3 shows a circuit diagram of an embodiment of the power supply circuit
  • Fig. 4a shows a time diagram of the triggering of four lamps within a time interval, with representation of the power consumed;
  • Fig. 4b shows a second time diagram of the triggering of four lamps
  • Fig. 5 shows measured voltage pulses at two lamp outputs.
  • Fig. 1 shows the structure, in principle, of a power supply circuit 10.
  • the circuit 10 comprises a control unit 12 and three switches S, which are connected between a voltage input 14 for an on-board voltage V B and three outputs 16. Switches S can be triggered by control unit 12. Three incandescent lamps L are connected to outputs 16.
  • the control unit 12 has a measurement input 18, at which it is connected to voltage input 14. Integrated into control unit 12 is a measurement device (not shown), with which the on-board voltage V B present at the voltage input is measured. Control unit 12 determines the ratio between the value of voltage V B and a nominal voltage permanently specified for outputs 16. This may differ for the various outputs. In the present example, however, it is assumed that a nominal voltage of 13.2 V is specified for all outputs 16. Incandescent lamps used nowadays in motor vehicles with 12 V electrical systems are optimized for operation at 13.2 V direct voltage (end-of-charge voltage in the 12 V motor vehicle electrical system).
  • Control unit 12 determines the ratio of the voltages. If the on-board voltage V B is 42 V, a ratio of approximately 0.314 is obtained. From this, control unit 12 calculates the pulse duty ratio for a pulse-width-modulated voltage in such a way that a lamp L triggered with the pulse-width-modulated voltage consumes the same power as it would also consume in the case of constant operation at the nominal (direct) voltage of 13.2 V. This conversion pulse duty ratio is calculated from the square of the voltage ratio. In the cited case, for example, it is 9.88%.
  • Fig. 2 shows the (idealized) characteristic of the corresponding pulse- width- modulated voltage U L over a lamp L.
  • an (ideally) square- wave voltage pulse with a height V B is generated for a time period t A - In the remaining interval T, the voltage is equal to zero.
  • the pulse duty ratio is the ratio of the time duration of voltage pulse t A to the overall duration T. With the above-calculated pulse duty ratio of 9.88%, the pulse duration t A is calculated at approximately 0.5 ms.
  • Lamps L are each operated with a pulse- width-modulated voltage of the time curve shown in Fig. 2. It has transpired that, with the preferred switching frequency of 200 Hz, the service life of these lamps is not negatively influenced to a significant extent. At this frequency, neither appreciable electromagnetic interference nor interfering acoustic effects occur. Nevertheless, this frequency is high enough for a lamp L to be perceived in operation as continuously illuminated.
  • FIG. 3 shows a circuit diagram of a headlamp unit 20 (outlined with a broken line). This is equipped with a power supply circuit 10 and incandescent lamps L - five in this case - connected to it.
  • the headlamp unit 20 is also equipped with a motor 22 for beam adjustment (mechanical setting) and multiple reflectors (not shown) arranged in a headlamp housing.
  • a microcontroller PIC16C74B is provided as control unit 12 of power supply circuit 10. From the on-board voltage V B supplied, two switching regulators 24, 26 generate the voltage levels of +12 V and +5 V required for the operation of motor 22 and microcontroller 12.
  • Microcontroller 12 is connected to a transceiver 28 for a CANBUS 30. This is an integrated transceiver TJA1054.
  • the five-channel switching device S is a group of high-side switches BTS442D2. These are FETs with a TTL triggering circuit, so switching device S is connected directly to outputs of microcontroller 12.
  • microcontroller 12 At its measurement input 18, microcontroller 12 has an integrated A/D converter for measurement of voltage V B .
  • the connected incandescent lamps L represent the functions: sidelights, dipped-beam, main-beam, fog lamps and flashing indicators.
  • the state (On/Off) of each lamp at every instant is stored. If the lamps have different nominal voltages, the relevant nominal voltages are also stored.
  • Triggering of the switching device S takes place at time intervals of 5 ms. Within each of these successive time intervals, microcontroller 12 measures voltage V B and defines the pulse duty ratio for the outputs of switching device S as described above. Switching device S is then triggered so that each of lamps L is supplied within the time interval with a voltage pulse in accordance with the defined conversion pulse duty ratio.
  • Power supply 10 communicates with the vehicle's electrical system via
  • microcontroller 12 receives commands to switch individual lamps L on and off via CANBUS 30. The corresponding memories within the microcontroller are then set. Via CANBUS 30, microcontroller 30 also indicates error states, such as short circuit or no-load operation at one of the lamp outputs. Further "intelligent" decisions may also be made in the control program of microcontroller 12. If, for instance, a temperature sensor (not shown) indicates that a maximum temperature has been exceeded, microcontroller 12 may dim one or more of lamps L (i.e. operate them at a lower pulse duty ratio) or switch them off. The microcontroller control may also comprise a fuse cutout.
  • Fig. 4a shows a time diagram of the voltage characteristic at four outputs 41, 42, 43, 44 of switching device S.
  • the nominal voltage at all outputs is identical, so identical pulse duty ratios, corresponding to identical switch-on time tA, are conveyed.
  • FIGS. 4a and 4b show the distribution of the voltage pulses over time at the four outputs within a switching interval T.
  • the time curves of the voltages at the four outputs 41, 42, 43 and 44 are hereby shown in the four upper graphs, and the lower graph shows the time curve of the power drawn from the motor vehicle electrical system.
  • the pulse duty ratio . A /T is less than 20%. It is therefore possible to trigger the four outputs 41, 42, 43, 44 sequentially. As is apparent from the upper four graphs, voltage pulses of a duration t A are applied to the four outputs in succession. At the end of the interval, a time duration of tc remains in which microcontroller 12 can execute further program functions, including the measurement of voltage V B and calculation of the duty factor, communication via the CANBUS etc.
  • the time curve of the power consumption from the electrical system of the motor vehicle is shown.
  • the sidelight is connected at output 41, the dipped-beam at output 42, the main-beam at output 43 and the flashing indicator at output 44.
  • the sidelight consumes only 5 W of power
  • the dipped-beam and main-beam each require 55 W.
  • the flashing indicator consumes 21 W (in the light phase shown).
  • the time curve for power consumption shown at the bottom of Fig. 4a is derived accordingly. By virtue of the strongly differing power values at the outputs, this characteristic is not constant. Because of the time distribution of the voltage pulses at the outputs over interval T, however, at least a certain uniformity of the power consumption is ensured.
  • Fig. 5 shows two successive voltage pulses, with which, through direct triggering of high-side switches S, i.e. without a driver stage, a rise time of approximately 13 ⁇ s is achieved. By virtue of this rise time, thermal losses occur, so the efficiency factor is approximately 95%. The power loss of up to 6 W thereby occurring in circuit 10 can be especially well combated if circuit 10 is constructed on a ceramic substrate with good thermal conduction properties.
  • the invention can be summarized in that a power supply circuit and a motor vehicle headlamp with a power supply circuit are described.
  • the power supply circuit comprises a voltage input for a voltage for the motor vehicle's electrical system and one or more voltage outputs for the connection of lamps.
  • the voltage at the voltage input is measured and compared with a predefined nominal voltage for the voltage outputs.
  • a conversion pulse duty ratio is determined from this, and the voltage outputs are intermittently connected to the voltage input by means of a switching device, so lamps connected there each consume their nominal power.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

L'invention concerne un circuit d'alimentation électrique (10) et un phare avant de véhicule automobile pourvu de ce circuit d'alimentation électrique (10). Ce circuit (10) possède une entrée (14) de tension du système électrique du véhicule et une ou plusieurs sorties (16) de tension couplées aux phares (2). La tension (VB) à l'entrée (14) est mesurée et comparée à une tension nominale prédéterminée pour les sorties (16). Ceci permet de déterminer un rapport fonctionnel des impulsions de conversion et de raccorder par intermittence les sorties de tension (16) au moyen d'un dispositif de commutation (S) à l'entrée de tension (14), afin que les phares (L) raccordés consomment chacun leur courant nominal.
PCT/IB2003/002217 2002-06-15 2003-06-11 Circuit d'alimentation electrique pour phares de vehicule a moteur WO2003107723A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003240175A AU2003240175A1 (en) 2002-06-15 2003-06-11 Power supply circuit for motor vehicle lamps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10226793A DE10226793A1 (de) 2002-06-15 2002-06-15 Spannungsversorgungsschaltung für KFZ-Lampen
DE10226793.6 2002-06-15

Publications (1)

Publication Number Publication Date
WO2003107723A1 true WO2003107723A1 (fr) 2003-12-24

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PCT/IB2003/002217 WO2003107723A1 (fr) 2002-06-15 2003-06-11 Circuit d'alimentation electrique pour phares de vehicule a moteur

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AU (1) AU2003240175A1 (fr)
DE (1) DE10226793A1 (fr)
WO (1) WO2003107723A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006024251A1 (fr) * 2004-09-01 2006-03-09 Conti Temic Microelectronic Gmbh Procede d'amorçage d'une source lumineuse electrique par modulation de largeur d'impulsion
WO2008059421A2 (fr) * 2006-11-13 2008-05-22 Philips Intellectual Property & Standards Gmbh Lampe halogène pour un éclairage virage ou un phare de virage
FR3036863A1 (fr) * 2015-06-01 2016-12-02 Renault Sa Circuit d'alimentation d'un dispositif d'eclairage d'un vehicule automobile, procede de regulation de l'alimentation electrique, dispositif d'eclairage et vehicule automobile associes

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006013300A1 (de) * 2006-03-21 2007-09-27 Kompled Gmbh & Co. Kg Fahrzeugleuchte und Anhänger-Beleuchtungsanordnung mit solchen Fahrzeugleuchten
DE102006038216A1 (de) * 2006-08-16 2008-02-21 Hella Kgaa Hueck & Co. Beleuchtungseinrichtung für Kraftfahrzeuge mit mindestens einer Glühlampe
DE102006039182A1 (de) * 2006-08-21 2008-03-20 Siemens Ag Adaptives Kurvenlicht ohne bewegliche Teile
DE102007007437A1 (de) 2007-02-15 2008-08-21 Volkswagen Ag Schaltungsanordnung, Steuergerät und Verfahren zur Ansteuerung von Leuchtmitteln
CN112810547B (zh) * 2020-12-31 2023-01-20 宁波宝贝第一母婴用品有限公司 用于向儿童座椅供电的供电控制装置及方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4841198A (en) * 1987-10-19 1989-06-20 Nartron Corporation Head lamp control method and apparatus, with PWM output regulation
US6307330B1 (en) * 2000-04-25 2001-10-23 Ford Global Technologies, Inc. System and method for operating incandescent lamps with high voltage source
US20020047533A1 (en) * 2000-09-19 2002-04-25 Aisin Seiki Kabushiki Kaisha Vehicular lamp control apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4841198A (en) * 1987-10-19 1989-06-20 Nartron Corporation Head lamp control method and apparatus, with PWM output regulation
US6307330B1 (en) * 2000-04-25 2001-10-23 Ford Global Technologies, Inc. System and method for operating incandescent lamps with high voltage source
US20020047533A1 (en) * 2000-09-19 2002-04-25 Aisin Seiki Kabushiki Kaisha Vehicular lamp control apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006024251A1 (fr) * 2004-09-01 2006-03-09 Conti Temic Microelectronic Gmbh Procede d'amorçage d'une source lumineuse electrique par modulation de largeur d'impulsion
US8093833B2 (en) 2004-09-01 2012-01-10 Conit Temic Microelectronic GmbH Method for controlling an electrical light source by pulse width modulation
WO2008059421A2 (fr) * 2006-11-13 2008-05-22 Philips Intellectual Property & Standards Gmbh Lampe halogène pour un éclairage virage ou un phare de virage
WO2008059421A3 (fr) * 2006-11-13 2008-12-11 Philips Intellectual Property Lampe halogène pour un éclairage virage ou un phare de virage
FR3036863A1 (fr) * 2015-06-01 2016-12-02 Renault Sa Circuit d'alimentation d'un dispositif d'eclairage d'un vehicule automobile, procede de regulation de l'alimentation electrique, dispositif d'eclairage et vehicule automobile associes

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Publication number Publication date
AU2003240175A1 (en) 2003-12-31
DE10226793A1 (de) 2004-01-08

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