EP3182799A1 - Procede de fonctionnement d'un moyen d'eclairage de lampe de vehicule comprenant plusieurs sources lumineuses semi-conductrices et destine a executer le procede de moyen d'eclairage adapte - Google Patents

Procede de fonctionnement d'un moyen d'eclairage de lampe de vehicule comprenant plusieurs sources lumineuses semi-conductrices et destine a executer le procede de moyen d'eclairage adapte Download PDF

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Publication number
EP3182799A1
EP3182799A1 EP15201325.6A EP15201325A EP3182799A1 EP 3182799 A1 EP3182799 A1 EP 3182799A1 EP 15201325 A EP15201325 A EP 15201325A EP 3182799 A1 EP3182799 A1 EP 3182799A1
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EP
European Patent Office
Prior art keywords
semiconductor light
voltage
light source
threshold
supply
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.)
Ceased
Application number
EP15201325.6A
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German (de)
English (en)
Inventor
Volker Zipf
Christoph KRÄMER
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Odelo GmbH
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Odelo GmbH
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Filing date
Publication date
Application filed by Odelo GmbH filed Critical Odelo GmbH
Priority to EP15201325.6A priority Critical patent/EP3182799A1/fr
Publication of EP3182799A1 publication Critical patent/EP3182799A1/fr
Ceased legal-status Critical Current

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    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators

Definitions

  • the invention relates to a method for operating a luminous means of a vehicle luminaire with a plurality of semiconductor light sources, in particular LEDs or OLEDs, according to the preamble of claim 1 and a luminous means suitable for carrying out the method according to the preamble of claim 9.
  • the vehicle electrical system voltage is typically between 11 V and 15 V. At least during the operation of the starter, the vehicle electrical system voltage drops to values between typically 7V and 8V.
  • semiconductor light sources Due to their high efficiency in the conversion of electric current into light, semiconductor light sources are increasingly being used as light sources for vehicle use.
  • the semiconductor light sources are hitherto predominantly inorganic, but in some cases organic light-emitting diodes.
  • Inorganic light emitting diodes consist of at least one light emitting diode semiconductor chip, short LED chip, and at least one, for example, molded by injection molding, the at least one LED chip completely or partially enveloping primary optics. Vehicle lights are also known in which pure LED chips are used without molded primary optics.
  • TCT Through Hole Technology
  • SMD Surface Mounted Device
  • COB Chip On Board
  • THT LEDs are a well-known type of inorganic light-emitting diodes. They are also referred to as leaded light-emitting diodes, as they consist of an at least in a desired emission transparent encapsulation, e.g. in the form of an encapsulation or an encapsulation, which includes a LED chip with a first electrical connection, for example in the form of an anode terminal connecting bonding wire and connected to a second electrical connection, for example in the form of a cathode terminal, LED chip. From the encapsulation protrude only the designated as little legs wires of the first electrical connection and the second electrical connection as the anode and cathode terminals of the THT-LED.
  • the second electrical connection embodied, for example, as a cathode connection can in this case be provided with a cup mentioned above, in which the LED chip is arranged.
  • the bonding wire leads from the example executed as an anode terminal first connection from outside the cup coming to the LED chip.
  • SMD LEDs SMD LEDs for short, are another well-known type of inorganic light-emitting diode.
  • SMD LEDs consist of a leadframe with at least one mounting surface for at least one LED chip and electrical connection surfaces.
  • the leadframe is made of a plastic body with at least one of them At least one mounting surface free recess partially encapsulated.
  • the electrical connection surfaces of the leadframe are also kept free as the electrical connections of the SMD LED for later surface mounting.
  • the at least one LED chip is arranged and electrically contacted at the bottom of the at least one recess extending to the at least one mounting surface. In this case, the LED chip is arranged on a first portion of the leadframe connected to at least one first electrical connection area.
  • a bonding wire connects the LED chip to a second portion of the leadframe, which in turn is connected to at least one second electrical pad.
  • the reaching at its base to the mounting surface recess may be designed reflector-like.
  • the walls of the recess form the above-mentioned primary reflector.
  • the walls can be coated reflective.
  • COB LEDs, COB LEDs for short consist of an unhoused LED chip and a bonding wire to be arranged directly on a light carrier.
  • the back side of the LED chip forms the first electrical connection of the COB LED.
  • the LED chip on its rear side is directly connected to a first conductor track of a luminous means carrier, e.g. electrically connected by soldering or welding.
  • the bonding wire forming the second electrical connection of the COB LED is likewise connected to a second conductor track of the illuminant carrier, e.g. electrically connected by soldering or welding.
  • LEDs are used uniformly for both, unless explicitly stated otherwise.
  • Outstanding properties of LEDs compared to other, conventional light sources of bulbs are a much longer life and a significantly higher light output with the same power consumption.
  • LEDs have lower power consumption compared to other light sources. This can be when using a or several LEDS as a light source of a light source, for example in a vehicle lamp, the load of a vehicle provided for power supply electrical system of a vehicle can be reduced, along with savings in energy consumption of the vehicle.
  • LEDs have a much longer life than other, for use in a vehicle lamp candidate light sources. Due to the longer service life, among other things, the lower failure rate increases the operational safety and, concomitantly, the quality of the vehicle lamp.
  • OLED organic light-emitting diode
  • OLED is a luminous thin-film component made of organic semiconducting materials with at least one emitter layer enclosed between electrically conductive, for example metallic layers for anode and cathode.
  • the thickness or, in other words, the thickness of the layers is on the order of about 100 nm. Typically, it is 100 nm to 500 nm, depending on the structure.
  • OLEDs typically encapsulated with an inorganic material, especially glass.
  • OLEDs do not require monocrystalline materials. Compared to LEDs, OLEDs can therefore be produced using inexpensive thin-film technology. As a result, OLEDs make it possible to produce flat light sources which on the one hand have a very thin appearance and, on the other hand, have a particularly homogeneous appearance when used as a luminous surface visible through the lens of a vehicle lamp.
  • LEDs have a forward voltage, which makes it possible to arrange a plurality of LEDs in series or in series with an LED string and to apply the vehicle electrical system voltage as a supply voltage to the LED string at normal, prevailing in driving operation with the engine running vehicle electrical system voltage. Due to the higher forward voltage of OLEDs, that number of OLEDs which can be connected in series or in series with an OLED strand and which, while maintaining the light emission, makes it possible to apply the vehicle electrical system voltage prevailing when the internal combustion engine is running as the supply voltage to an OLED line with LEDs.
  • semiconductor light sources have the disadvantage that they do not tend to darken just like conventional light sources due to their functional principle and short reaction time, for example when the electric starter of an internal combustion engine of a vehicle is actuated when the light is on and the vehicle electrical system voltage therefore drops when the voltage applied to them falls below their respective forward voltage or when the vehicle electrical system voltage drops below a minimum supply voltage resulting from the sum of the forward voltages of the semiconductor light sources connected in series with a semiconductor light source train.
  • the number of semiconductor light sources arranged in series with a semiconductor light source strand has been reduced to a number in which the maintenance of an electrical voltage at each of the semiconductor light source voltage is still maintained in the case of, for example, the operation of an electric starter of an internal combustion engine.
  • Strand arranged semiconductor light source is ensured above the forward voltage.
  • semiconductor light sources such as the mentioned LEDs and / or OLEDs, and / or semiconductor light source strands, such as the mentioned LED strands and / or OLED strands, moreover, hitherto installed in series with current limiters or similarly acting circuit elements which, with normal vehicle electrical system voltage, reduce these to a supply voltage in which they are connected in series Switched semiconductor light sources take no damage, and still allow the operation of the series-connected semiconductor light sources with lowered vehicle electrical system voltage.
  • US 2007/108843 A1 is a power supply of series-connected semiconductor light sources of a vehicle intended for light bulbs known.
  • the power supply includes a constant current source and a bypass switch in parallel with each semiconductor light source and / or each pair of series-connected semiconductor light sources and / or each group of series-connected semiconductor light sources.
  • By opening and closing the respective bypass switch the individual semiconductor light sources and / or pairs of semiconductor light sources connected in series and / or groups of semiconductor light sources connected in series can be individually illuminated or switched off as required.
  • An electrical control of the bypass switch detects faults of one or more semiconductor light sources and switches off faulty semiconductor light sources by bridging. The electrical control can illuminate redundant semiconductor light sources to replace faulty semiconductor light sources.
  • the electrical control can dim one or more semiconductor light sources as needed.
  • the bypass in certain operating conditions, as would prevail in a vehicle application, for example, with lowered vehicle electrical system voltage, at least a portion of the LEDs remains dark.
  • This is not a satisfactory solution to the described impairment of traffic safety, because a part of the semiconductor light sources of a provided for fulfilling a light function in a vehicle lamp bulb with multiple semiconductor light sources as light sources with lowered vehicle electrical system voltage remain recognizable dark and thus the light emission of the bulb is reduced overall and at least does not occur in individual spatial directions of the entire, solid angle range to be covered by all semiconductor light sources.
  • the lighting means may have a current limiter arranged in series with the LEDs, accompanied by the disadvantage of high power loss at high supply voltage.
  • the lighting means may comprise a microcontroller and activation switches arranged in series with the LEDs and / or bypass switches arranged parallel to one or more of the LEDs. Outputs of the microcontroller open and close the switches to turn the LEDs on when the power supply voltage by closing the activation switch all shut down at too high supply voltage by opening the activation switch or to bridge at low supply voltage by closing the bypass switch part of the LEDs.
  • the microcontroller can compare a detected supply voltage and / or a supply current intensity and / or a temperature with one or more threshold values and, depending thereon, completely disconnect the LEDs from the supply voltage or bypass a portion of the LEDs or switch on all the LEDs.
  • this is not a satisfactory solution to the described impairment of traffic safety, because part of the LEDs of a provided for fulfilling a light function in a vehicle lamp bulb with multiple LEDs as light sources with lowered vehicle electrical system voltage directly remain visible dark and thus the light emission of the light source is reduced overall and at least in individual spatial directions of the entire, to be covered by all LEDs together solid angle range is absent.
  • An object of the invention is to develop a method for operating a luminous means with a plurality of semiconductor light sources and a corresponding illuminant suitable for carrying out such a method, which allow a low power loss with a simultaneously high contribution to traffic safety.
  • a first subject of the invention accordingly relates to a method for operating a luminous means provided for a vehicle luminaire with a plurality of semiconductor light sources.
  • the luminous means has at least one group of at least two semiconductor light sources arranged in series with a semiconductor light source strand.
  • the method provides, at least during operation of the luminous means, during which the luminous means is supplied with an electrical system voltage of a vehicle, in which the vehicle lamp is installed and used, or one of these proportional voltage is applied and a light emission of at least a portion of its semiconductor light sources is to monitor the vehicle electrical system voltage and capture it.
  • the method further provides for comparing the monitored and detected vehicle electrical system voltage or the voltage proportional thereto with a voltage threshold which is at least equal to or higher than the sum of the forward voltages of the at least two semiconductor light sources arranged in series in a semiconductor light source train.
  • the method provides for the at least one semiconductor light source strand of at least two semiconductor light sources arranged in series to be acted upon by the vehicle electrical system voltage or the voltage proportional thereto All semiconductor light sources of the semiconductor light source strand are current-flowed and emit light.
  • the method provides At least one semiconductor light source strand from at least two semiconductor light sources arranged in series with the vehicle electrical system voltage or proportional voltage and at the same time to bridge at least one semiconductor light source per semiconductor light source strand at least one semiconductor light source in one or in each of the plurality of semiconductor light source strands , At the at least one semiconductor light source bridged per semiconductor light source strand, no or a smaller voltage drop occurs than its forward voltage, as a result of which the bridged semiconductor light source remains dark. However, in each case a voltage which is higher than the respective forward voltage is applied to the one or more semiconductor light sources remaining in operation.
  • the method provides for a monitored and detected vehicle electrical system voltage or a monitored and detected, this proportional voltage, which is lower than the voltage threshold that, except for at least one semiconductor light source per semiconductor light source strand all remaining semiconductor light sources are current-flowing and thus in operation and Emit light.
  • the method provides for the at least one semiconductor light source remaining in operation for each semiconductor light source strand to be energized higher in order thereby to compensate for a decrease in the brightness due to the omission of a light emission of the at least one bridged semiconductor light source.
  • the method provides, at least during operation of the light source, to permanently monitor and detect the vehicle electrical system voltage or the voltage proportional thereto and to compare it with the voltage threshold and, depending on the comparison, all semiconductor light sources arranged in series in a similar manner to a semiconductor light source train to operate or except for at least one each of at least one of each semiconductor light source strand arranged in series semiconductor light sources and thus exclude from the light emission and the absence of light emission of the at least one bridged semiconductor light source by a higher energization associated with to compensate for a higher light emission of at least one remaining in operation semiconductor light source.
  • the method can provide for the mixing of an optical system, such as a diffuse optical disk, for example a frosted glass, or the semiconductor light sources, to the semiconductor light sources of the lamp
  • an optical system such as a diffuse optical disk, for example a frosted glass, or the semiconductor light sources
  • the semiconductor light sources of the lamp For example, to arrange behind a diffuse disk, such as behind a diffuse lens or behind a provided between an example clear lens and the semiconductor light sources diffuse optical disc.
  • a second subject of the invention relates to a light source suitable for carrying out a previously described method with a plurality of semiconductor light sources for a vehicle light.
  • the luminous means has at least one group of at least two semiconductor light sources arranged in series with a semiconductor light source strand.
  • the luminous means comprises means for monitoring and detecting a vehicle electrical system voltage and / or a voltage proportional thereto and for comparing the monitored and detected vehicle electrical system voltage and / or this proportional voltage with a voltage threshold which is at least equal to or higher than the sum of the forward voltages of at least two semiconductor light sources arranged in series with a semiconductor light source string.
  • the luminous means comprises means for switching between semiconductor light sources of the at least one group arranged in series with a semiconductor light source strand to form an arrangement in which at least one semiconductor light source in the semiconductor light source strand is bridged, except for at least one semiconductor light source remaining in operation.
  • the light-emitting means also comprises means for increasing the current through the voltage lowered at the vehicle power supply voltage or a voltage proportional thereto below the voltage threshold, at least one semiconductor light source remaining in operation.
  • the luminous means may comprise a mixing optical system placed in front of the semiconductor light sources, such as a diffuse optic disk, for example a frosted glass pane.
  • the semiconductor light sources of the luminous means may, for example, be arranged behind a diffuse disk, such as behind a diffuse light disk or behind a diffuse optical disk provided between, for example, a clear light disk and the semiconductor light sources.
  • the mixing optical system can be realized by, for example, irradiation of the semiconductor light source (s) of the illuminant in diffuse optical waveguide plastics or systems of diffusing lenses and / or diffuse surfaces and / or optics in which the number of semiconductor light sources coupling in is not directly recognizable.
  • the optical systems can also be combined with each other.
  • the lighting means may comprise LEDs and / or OLEDs as semiconductor light sources.
  • the light source may include its own powered by the vehicle electrical system voltage or this voltage proportional source.
  • the current source is preferably a controllable and / or controllable constant current source fed by the vehicle electrical system voltage.
  • the power source may include a DC-DC converter (DC-DC converter).
  • DC-DC converter DC-DC converter
  • the current source can be integrated in an IC or be constructed discretely, for example with transistors and / or field-effect transistors and / or operational amplifiers.
  • the means for switching between the semiconductor light sources arranged in series with a semiconductor light source string to an arrangement in which a semiconductor light source is bridged in the semiconductor light source string may be at least partially integrated into an integrated circuit (IC) of the power source.
  • IC integrated circuit
  • the means for monitoring and detecting the vehicle electrical system voltage and / or one of these voltage proportional as well as for comparison and / or the means for switching may include a microcontroller, by such at least be partially realized or be covered by such in whole or in part. Measurement of the vehicle electrical system voltage. Accordingly, the monitoring and detection of the vehicle electrical system voltage and the switching can be done by a microcontroller.
  • the bridging of the at least one semiconductor light source can take place at any point in the semiconductor light source strand, can also affect n LEDs in one strand of m LEDs.
  • a separation of the at least one semiconductor light source at a node may also be possible with a normal diode circuit or field effect transistor.
  • the light source may include a backup capacitor.
  • the backup capacitor can also be used to compensate.
  • the lighting means may comprise individual or a combination of the features and / or features described above and / or subsequently described in connection with the method, as well as the method alone or a combination of several previously and / or subsequently in connection with the lighting means have described features and / or can realize.
  • Both the method and the illuminant may alternatively or additionally be single or a combination of several in connection with the prior art and / or in one or more of the prior art documents and / or in the following description to those in the Drawings illustrated embodiments described features.
  • the invention makes it possible to reduce the power loss while at the same time avoiding unwanted brightness fluctuations in vehicle lights installed in vehicles with automatic engine shutdown (start-stop) with one or more light sources having semiconductor light sources arranged in series in semiconductor light source strands as light sources.
  • the invention solves this problem by switching off an LED each made up of three LED string constructed in series with LEDs built into a LED string while simultaneously increasing the current through the remaining two LEDs in the LED string. At higher voltage, all three LEDs are active.
  • each LED strand is switched off with lowered vehicle electrical system voltage one LED, the LEDs a mixing light system, such as a milky optical disc, for example made of frosted glass, or put a milky lens on top. This makes it invisible that with lowered vehicle electrical system voltage less LEDs, but are correspondingly lighter in use, as in normal vehicle electrical system voltage.
  • the invention prevents a perceptible flickering of the light function in the case of lowered vehicle electrical system voltage is perceptible. Since semiconductor light sources, such as LEDs or OLEDs suddenly extinguish when the voltage applied to them drops below their forward voltage, the invention provides an on-board voltage-dependent limitation on the number of semiconductor light sources connected in series to a semiconductor light source strand so that they do not go out when the vehicle electrical system voltage is extinguished and at normal vehicle electrical system voltage lowest possible power loss occurs.
  • the invention makes it possible to meet the requirement that with a lowered vehicle electrical system voltage of 7V already 70% of the brightness can be achieved, as in the conventional solution always only two semiconductor light sources in series to a semiconductor light source strand to switch in the invention preferably a total of three Semiconductor light sources per semiconductor light source strand used, which radiate all normal at board voltage all light and of which at lowered Vehicle power supply voltage bridged and thus remains dark, and to compensate for the loss of brightness due to the dark remaining, bridged semiconductor light source, the remaining semiconductor light sources are energized higher with reduced vehicle electrical system voltage in return.
  • three LEDs may be connected in series by the invention, with one of the three LEDs being switched off at low voltages, and the current through the two active LEDs being increased to achieve the required brightness values.
  • the invention provides that with lowered vehicle electrical system voltage below the voltage threshold to at least one remaining semiconductor light source per semiconductor light source strand shutdown at least one semiconductor light source per semiconductor light source strand and at the same time increasing the current through the remaining operating at least one semiconductor light source, whereas at normal onboard voltage equal to or above the voltage threshold all semiconductor light sources serially connected to a semiconductor light source string are active.
  • a pre-set, mixing light system such as frosted glass, can be provided to make invisible that less semiconductor light sources, but are correspondingly lighter in use.
  • the switching means 04 switch the semiconductor light sources 02 of the at least one group 20 arranged in series with a semiconductor light source strand 21 to form an arrangement in which at least one semiconductor light source 22 remains in operation, for example during operation of an electric starter Internal combustion engine of a vehicle prevailing, lowered vehicle electrical system voltage «supply» dark remaining semiconductor light source 23 is bridged in the semiconductor light source strand 21, when the vehicle electrical system voltage «supply» and / or this proportional voltage drops below the voltage threshold «threshold», and switch the semiconductor light sources 02 of the arrangement, in which at least one dark-remaining semiconductor light source 23 is bridged in the semiconductor light source strand 21 except for at least one semiconductor light source 22 remaining in operation, back again in series with the semiconductor light source string 21 when the on-board supply voltage «supply» and / or this proportional voltage has risen again up to the voltage threshold «threshold» or above.
  • all semiconductor light sources 02 in the semiconductor light source strand 21 are current-flowed and
  • the means 04 for switching comprise, for example, at least one arranged in the semiconductor light source strand 21 between two semiconductor light sources 02 node 40 and at least one switch 41, the node 40 an electrical potential in front of a node 40 upstream semiconductor light source 02 or downstream of the node 40 Semiconductor light source 02 turns on. As a result, at least one of the node 40 upstream or downstream of this semiconductor light source 02 is bridged upon actuation of the switch 41 and remains dark.
  • the switch 41 may be implemented as an electronic switch, for example as a transistor.
  • the light source 01 further comprises means 05 for increasing the current through the at least one operating semiconductor light source 22 of the arrangement, wherein at least one remaining in operation semiconductor light source 22 at least one prevailing, for example, during operation of an electric starter of an internal combustion engine of a vehicle, lowered vehicle electrical system voltage «supply» dark remaining semiconductor light source 23 is bridged in the semiconductor light source strand 21, with lowered vehicle electrical system voltage «supply» or one of these proportional voltage below a voltage threshold «threshold».
  • the light source 01 allows the implementation of a method for operating a light source 01 comprising a plurality of semiconductor light sources 02 for a vehicle light, which light source 01 comprises at least one group 20 of at least two semiconductor light sources 02 arranged in series with a semiconductor light source strand 21.
  • the method provides that, for example, during operation of an electric starter of an internal combustion engine of a vehicle prevailing, lowered vehicle supply voltage «supply» or one of these proportional voltage below a threshold voltage «threshold» to at least one remaining operating semiconductor light source 22 per semiconductor light source Strand 21 is a shutdown of at least one semiconductor light source 23 per semiconductor light source strand 21 and at the same time an increase in the current remaining in operation by at least one semiconductor light source 22 of the semiconductor light source strand 21, whereas at normal vehicle electrical system voltage «supply» or one of these proportional voltage equal to or above of the voltage threshold "threshold" all semiconductor light sources 02 connected in series to a semiconductor light source strand 21 are active.
  • the invention can be realized in that, for example, during the actuation of an electric starter of an internal combustion engine of a vehicle prevailing, lowered vehicle supply voltage «supply» or one of these proportional voltage below a threshold voltage «threshold» the at least one per semiconductor light source Strand 21 in operation remaining semiconductor light source 22 is energized higher, thereby compensating for a decrease in brightness by the absence of light emission of the at least one bridged, dark remaining semiconductor light source 23.
  • the Halblei terlichtánn 02 be pre-set a mixing optical system, such as a diffuse optical disk, such as a frosted glass.
  • the semiconductor light sources 02 of the luminous means 01 can be arranged, for example, behind a diffuse disk, such as behind a diffuse light disk or behind
  • the mixing optical system can be realized by, for example, irradiation of the semiconductor light source 02 of the light source 01 in diffuse optical waveguide plastics or systems of diffusing lenses and / or diffuse surfaces and / or optics in which the number of semiconductor light sources 02 coupled in is not direct are recognizable.
  • the optical systems can also be combined with each other.
  • Such an embodiment of the luminous means 01 makes it possible to carry out a method for operating a light source 01 comprising a plurality of semiconductor light sources 02 for a vehicle light, which light source 01 comprises at least one group 20 of at least two semiconductor light sources 02 arranged in series with a semiconductor light source strand 21.
  • the method provides that, for example, during the actuation of an electric starter of an internal combustion engine of a vehicle prevailing, lowered vehicle supply voltage «supply» or one of these proportional voltage below a threshold voltage «threshold» to at least one remaining operational Semiconductor light source 22 per semiconductor light source strand 21, a shutdown of at least one semiconductor light source 23 per semiconductor light source strand 21 and at the same time increasing the current through the remaining in operation at least one semiconductor light source 22 of the semiconductor light source strand 21, whereas at normal vehicle electrical system voltage «supply» or one of these proportional voltage equal to or above the voltage threshold «threshold» all to a semiconductor light source strand 21 in series semiconductor light sources 02 are active.
  • the method can provide that the semiconductor light sources 02 of the light source 01 is preceded by a mixing optical system, such as a diffuse optical disk, such as a frosted glass, or the semiconductor light sources 02, for example behind a diffuse disk, such as behind a diffuse lens or behind a provided between an example clear lens and the semiconductor light sources 02 diffuse optical disc are arranged to darken the at least one bridged and thus dark remaining semiconductor light source 23 at a lowered vehicle electrical system voltage «supply» or one of these proportional voltage below the voltage threshold «threshold "To conceal.
  • a mixing optical system such as a diffuse optical disk, such as a frosted glass
  • the semiconductor light sources 02 for example behind a diffuse disk, such as behind a diffuse lens or behind a provided between an example clear lens and the semiconductor light sources 02 diffuse optical disc are arranged to darken the at least one bridged and thus dark remaining semiconductor light source 23 at a lowered vehicle electrical system voltage «supply» or one of these proportional voltage below the voltage threshold «threshold "To conceal.
  • the light-emitting means 01 preferably comprises LEDs and / or OLEDs as semiconductor light sources 02.
  • the light source 01 may have its own current source 50 fed by the on-board supply voltage «supply» or by the voltage proportional thereto.
  • the current source 50 is preferably a controllable and / or controllable constant current source fed by the onboard supply voltage "supply".
  • the current source 50 may include a DC-DC converter (DC-DC converter).
  • the power source 50 may be as in Fig. 1 indicated integrated in an integrated circuit (IC) or as in Fig. 2 shown discrete, for example, with transistors and / or field effect transistors and / or operational amplifier.
  • IC integrated circuit
  • Fig. 2 shown discrete, for example, with transistors and / or field effect transistors and / or operational amplifier.
  • FIG Fig. 2 A circuit diagram of a conceivable embodiment of the current source 50 is shown in FIG Fig. 2 shown.
  • the means 04 for switching between the semiconductor thresholds 02 arranged above the voltage threshold "threshold" in series with a semiconductor light source string 21 can be arranged such that at least one of, for example, during actuation of an electrical starter of an internal combustion engine Vehicle prevailing, lowered vehicle electrical system voltage «supply» and / or one of these proportional voltage below the threshold voltage «threshold» dark remaining semiconductor light source 23 is bridged in the semiconductor light source strand 21, at least partially integrated into the power source 50, for example in an integrated Circuit of the power source.
  • the means 03 for monitoring and detecting the vehicle electrical system voltage and / or a voltage proportional thereto and for comparison and / or the means 04 for switching may comprise a microcontroller, or at least partially realized by such or be wholly or partially covered by such. Accordingly, the monitoring and detection of the vehicle electrical system voltage "supply" and / or voltage proportional thereto and their comparison with the threshold voltage threshold and / or the switch between the semiconductor light source strand 21 and the arrangement, with at least one bridged and thereby dark remaining semiconductor light source 23 and at least one remaining in operation semiconductor light source 22 of the group 20 of semiconductor light sources 02 by a microcontroller.
  • the lighting means 01 may comprise at least one backup capacitor, for example for temporary buffering during the switching.
  • the backup capacitor can also be used to compensate.
  • Fig. 1 illustrated bulbs are connected in normal operation three as semiconductor light sources 02 of a group 20 of semiconductor light sources 02, for example, LEDs used to a semiconductor light source strand 21 in series.
  • the vehicle electrical system voltage «supply» or one of these proportional voltage below a threshold voltage threshold «threshold» is bridged before the visible extinction of the semiconductor light sources 02, for example, LEDs used Group 20 of semiconductor light sources 02 thereby darkly remaining semiconductor light source 23, whereby the on this now bridged and thus dark remaining semiconductor light source 23 is obtained in normal operation falling forward voltage and the remaining in operation semiconductor light sources 22 is available.
  • the current is correspondingly increased by the two semiconductor lamps 22 remaining in operation, for example, as LEDs, so that the amount of light remains the same when the on-board supply voltage «supply» or the voltage proportional thereto remain the same. Due to a mixing optical system, a viewer does not recognize a resulting brightness change.
  • the LEDs used as semiconductor light sources 02 for example, have no problems with the increase in current, especially since it is a short-term operation.
  • Fig. 1 and Fig. 2 are a separation or bridging of the at least one, for example, during actuation of an electric starter of an internal combustion engine of a vehicle prevailing, lowered on-board voltage "supply” and / or a voltage proportional thereto below the voltage threshold "threshold" dark remaining semiconductor light source 23 at a node 40th also possible with a normal diode circuit or field effect transistor instead of a switch 41 designed as a transistor.
  • the bridging of at least one then remaining dark semiconductor light source 23 of the group 20 of semiconductor light sources 02, for example, during operation of an electric starter of an internal combustion engine of a vehicle prevailing, lowered on-board voltage «supply» and / or one of these proportional voltage below the voltage threshold «threshold» can at the beginning or as in Fig. 1 shown at the end or as in Fig. 2 shown in the middle of the semiconductor light source strand 21.
  • a voltage threshold «threshold which is at least equal to or is higher than the sum of the forward voltages of the at least two semiconductor light sources 02 of the group 20 of semiconductor light sources 02 arranged in series with a semiconductor light source strand 21, as shown in FIG Fig. 3 be constructed shown.
  • bulbs 01 executable method for operating a plurality of semiconductor light sources 02 having light source 01 for a vehicle lamp which illuminant 01 at least one group 20 of at least two to a semiconductor light source strand 21 arranged in series semiconductor light sources 02, may provide that at least during operation of the light source 01, during which the light source 01 with a vehicle electrical system voltage «supply» of a vehicle in which the vehicle light is installed and is thus used, or one of these proportional voltage is applied and a light emission of at least a portion of the semiconductor light sources 02 is provided, the on-board network voltage «supply» or monitored a proportional voltage and thus detected.
  • the method may provide for comparing the monitored and recorded vehicle supply voltage "supply” or the monitored and detected voltage proportional to the vehicle supply voltage "supply” with the voltage threshold "threshold”.
  • the method may further provide that if the monitored and detected on-board voltage "supply” or that of this proportional voltage is equal to or higher than the voltage threshold "threshold", the at least one semiconductor light source strand 21 of at least two semiconductor light sources 02 arranged in series Group 20 of at least two semiconductor light sources 02 with the vehicle electrical system voltage «supply» or the voltage proportional thereto is applied.
  • all semiconductor light sources 02 of group 20 connected in series to a semiconductor light source strand 21 are current-flowed by at least two semiconductor light sources 02 and emit light.
  • the method can start again with the monitoring and detection of the on-board voltage "supply” or one of these proportional voltage.
  • the method may provide in that the at least one semiconductor light source strand 21 is acted upon by at least two semiconductor light sources 02 arranged in series with the supply voltage or voltage and at least one semiconductor light source strand 21 per semiconductor light source strand 21, at least one then remaining in operation Semiconductor light source 02 in which one or in each of the plurality of semiconductor light source strands 21 is bridged.
  • the bridging leads to at least one dark remaining semiconductor light source 23 which was previously normal Vehicle supply voltage «supply» or this proportional voltage equal to or higher than the voltage threshold «threshold» to a semiconductor light source strand 21 series-connected semiconductor light sources 02 group 20 of semiconductor light sources 02.
  • bridging occurs at the per semiconductor light source strand 21 bridged, at least a dark remaining semiconductor light source 23 no or a smaller voltage drop, as their forward voltage on. However, in each case a voltage which is higher than the respective forward voltage is applied to the one or more remaining semiconductor light sources 22 in operation.
  • the method provides for a monitored and detected vehicle supply voltage «supply» or one of these proportional voltage, which is lower than the voltage threshold «hreshold», that except for at least one dark remaining semiconductor light source 23 per semiconductor light source strand 21, all remaining semiconductor light sources 22nd flowed through and are thus in operation and emit light.
  • the voltage threshold "threshold” is at least equal to or higher than the sum of the forward voltages of the at least two semiconductor light sources 02 of the group 20 of semiconductor light sources 02 arranged in series with a semiconductor light source strand 21.
  • the method can provide that the on-board supply voltage «supply» or one of these proportional voltage is permanently monitored and permanently compared with the voltage threshold «threshold».
  • the method can provide that if, in the comparison, the presence of changed prerequisites is determined, then the semiconductor light sources 02 in the semiconductor light source strand 21 are all operated or partially bridged.
  • the method can additionally provide that, in this connection, the method subsequently begins again with the monitoring and detection of the vehicle electrical system voltage, in order to partially bridge or operate all of the semiconductor light sources 02 in the semiconductor light source train 21 again if there are changed conditions.
  • the method provides, at least during the operation of the light source 01, the vehicle electrical system voltage «supply» or a proportional voltage to permanently monitor and detect and compare with the voltage threshold «threshold» and depending on the comparison, all of a semiconductor light sources -Strand 21 in series arranged semiconductor light sources 02 to operate equally or except for at least one operating semiconductor light source 22 each at least one then dark remaining semiconductor light source 23 each to a semiconductor light source strand 21 arranged in series semiconductor light sources 02 and thus exclude from the light emission and to compensate for the lack of light emission of the at least one bridged and thus dark remaining semiconductor light source 23 by a higher energization accompanied by a higher light emission of the at least one remaining in operation semiconductor light source 22.
  • the light source 01 may comprise individual or a combination of the features or features described above in connection with the method and / or corresponding features, just as the method may comprise single or a combination of several features previously described in connection with the light source 01 and / or can realize.
  • Both the method and the illuminant 01 may alternatively or additionally comprise single or a combination of several in the context of the prior art and / or in one or more of the documents mentioned in the prior art and / or in the preceding description to those in Having described in the drawings embodiments described features.
  • the light source 01 behaves like a "two in series" system. If no switchover took place and the light source 01 were always operated in series with two semiconductor light sources 02, a proportionally higher power loss would occur during driving operation. This has a detrimental effect on life, due to larger boards or heat sink, the use of materials, as well as color and Brightness change of the LED used as semiconductor light sources 02, for example, to name just a few of the resulting in a "two in series” system compared to the invention disadvantages.
  • the invention can in principle also be implemented by a vehicle lamp, in which at least one light source provided to fulfill at least one of its light functions is constructed and / or able to carry out a previously described method as described above.
  • a corresponding vehicle lamp comprises, for example, a luminaire interior substantially enclosed by a luminaire housing and a lens, and at least one light source accommodating at least one light source housed therein for at least one light function of the vehicle luminaire.
  • Each vehicle lamp fulfills one or more tasks or functions depending on the design.
  • a light function of the vehicle lamp is provided.
  • Light functions are, for example, in a configuration as a headlamp a function illuminating the road surface, or in a configuration as a signal light, a signal function, such as a Wiederblinklichtfunktion to the direction indicator or a brake light function to indicate a braking action, or.
  • a limiting light function such as a taillight function, to ensure visibility of the vehicle during the day and / or night, such as in a taillight or daytime running light configuration.
  • vehicle lights are thesselbug, on the vehicle flanks and / or on the side mirrors arranged flashing lights, exit lights, such as ambient lighting, marker lights, brake lights, fog lamps, reversing lights, and typically high set third brake lights, so-called Central, High-Mounted Braking lights, daytime running lights, headlamps and fog lights used as turning or cornering lights, as well as combinations thereof.
  • Each light function must fulfill an example prescribed by law light distribution.
  • the light distribution sets at least to be observed, colloquially known as brightness luminous flux in at least to be observed solid angle ranges.
  • At least one light source of the luminous means of a vehicle lamp can be assigned one or more optical elements contributing to the shaping of a light distribution for directing the light.
  • the lens is formed by a transparent cover which is usually made of a plastic material today, which closes off the interior of the lamp and protects the components housed therein, such as one or more lamps, reflectors and alternatively or additionally provided optical elements against the effects of weathering.
  • the luminaire housing or the interior of the luminaire can be subdivided into a plurality of chambers, each with its own light sources and / or illuminants and / or optical elements and, if appropriate, light disks, of which several chambers can be identical and / or each chamber can fulfill a different lighting function.
  • the optical elements mentioned can be at least one reflector and / or at least one lens and / or one or more optical disks or the like arranged in the beam path between at least one light source of the luminous means and the light disk.
  • At least one reflector arranged behind at least one light source of at least one luminous means can be accommodated in the luminaire interior.
  • the reflector may be formed at least in part by a separate component and / or by at least one part of the luminaire housing itself, for example by means of an at least partially reflective coating.
  • the lens itself may alternatively or additionally be formed as an optical element, for example by being preferably provided on the inside with an optical structure contributing to the production of one or more light distributions mentioned above. This may possibly be dispensed with an optical disk.
  • Examples of vehicle lights are arranged on the vehicle's bow, on the vehicle flanks and / or on the side mirrors and on the rear of the vehicle
  • Such a combination is realized, for example, regularly in the known taillights. These include, for example, repeating flashing lights, marker lights, brake lights, fog lights and reversing lights are used to name just one of many realized in tail lights combinations. Neither does this enumeration claim to be complete, nor does this mean that in a tail light all the aforementioned lights must be combined. Thus, for example, only two or three of the mentioned or else other lights in a common luminaire housing a tail light be combined.
  • the invention is particularly industrially applicable in the field of manufacturing vehicle lights, in particular motor vehicle lights.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP15201325.6A 2015-12-18 2015-12-18 Procede de fonctionnement d'un moyen d'eclairage de lampe de vehicule comprenant plusieurs sources lumineuses semi-conductrices et destine a executer le procede de moyen d'eclairage adapte Ceased EP3182799A1 (fr)

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EP15201325.6A EP3182799A1 (fr) 2015-12-18 2015-12-18 Procede de fonctionnement d'un moyen d'eclairage de lampe de vehicule comprenant plusieurs sources lumineuses semi-conductrices et destine a executer le procede de moyen d'eclairage adapte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15201325.6A EP3182799A1 (fr) 2015-12-18 2015-12-18 Procede de fonctionnement d'un moyen d'eclairage de lampe de vehicule comprenant plusieurs sources lumineuses semi-conductrices et destine a executer le procede de moyen d'eclairage adapte

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005022596A2 (fr) * 2003-08-27 2005-03-10 Osram Sylvania Inc. Circuit d'attaque pour feu de vehicule a del
US20070108843A1 (en) 2005-11-17 2007-05-17 Preston Nigel A Series connected power supply for semiconductor-based vehicle lighting systems
WO2008149294A1 (fr) * 2007-06-08 2008-12-11 Koninklijke Philips Electronics N.V. Circuit de commande pour commander plusieurs sources de lumière agencées dans une configuration en série
WO2010013177A1 (fr) * 2008-07-29 2010-02-04 Koninklijke Philips Electronics N.V. Dispositif d’illumination comportant de multiples diodes électroluminescentes
EP2194760A1 (fr) * 2008-12-08 2010-06-09 Delphi Technologies, Inc. Dispositif doté de plusieurs voyants électriques reliés en série
US20130069547A1 (en) * 2011-09-16 2013-03-21 Cree, Inc. Solid-state lighting apparatus and methods using energy storage
US20130169256A1 (en) * 2011-12-29 2013-07-04 Infineon Technologies Austria Ag Low EMI Driver Circuit
US20130207548A1 (en) 2012-02-14 2013-08-15 Itai Leshniak Light emitting diode and integrated package therefor
US20130313987A1 (en) * 2012-05-26 2013-11-28 Hung-Chi Chu Methods and apparatus for segmenting and driving led-based lighting units

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005022596A2 (fr) * 2003-08-27 2005-03-10 Osram Sylvania Inc. Circuit d'attaque pour feu de vehicule a del
US20070108843A1 (en) 2005-11-17 2007-05-17 Preston Nigel A Series connected power supply for semiconductor-based vehicle lighting systems
WO2008149294A1 (fr) * 2007-06-08 2008-12-11 Koninklijke Philips Electronics N.V. Circuit de commande pour commander plusieurs sources de lumière agencées dans une configuration en série
WO2010013177A1 (fr) * 2008-07-29 2010-02-04 Koninklijke Philips Electronics N.V. Dispositif d’illumination comportant de multiples diodes électroluminescentes
EP2194760A1 (fr) * 2008-12-08 2010-06-09 Delphi Technologies, Inc. Dispositif doté de plusieurs voyants électriques reliés en série
US20130069547A1 (en) * 2011-09-16 2013-03-21 Cree, Inc. Solid-state lighting apparatus and methods using energy storage
US20130169256A1 (en) * 2011-12-29 2013-07-04 Infineon Technologies Austria Ag Low EMI Driver Circuit
US20130207548A1 (en) 2012-02-14 2013-08-15 Itai Leshniak Light emitting diode and integrated package therefor
US20130313987A1 (en) * 2012-05-26 2013-11-28 Hung-Chi Chu Methods and apparatus for segmenting and driving led-based lighting units

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