• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Lighting device for vehicles with at least two LED branches connected in parallel (ZW1, ZW2 ... ZWn), each branch having at least one series resistor (R1 ... Rn) and at least one LED (D11 ... Dn2) connected in series, the at least one series resistor (R1 ... Rn) each branch (ZW1 ... ZWn) is bridged by a ladder section (LA1 ... LAn) provided on a ladder carrier, this ladder section being accessible to a tool with the aid of which it can be severed. For symmetrizing the branches, the current through each branch and / or the brightness of at least one LED in each branch is measured, and in a branch in which the measured current and / or the measured brightness exceed a definable limit, the bridging conductor section of the at least one Pre-resistor with the help of the tool severed.
    公开号:AT517122A1
    申请号:T50379/2015
    申请日:2015-05-08
    公开日:2016-11-15
    发明作者:Weber Emanuel；Kieslinger Dietmar；Biesenberger Martin
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    Lighting device for vehicles
    The invention relates to a lighting device for vehicles with at least two parallel-connected LED branches, wherein each branch in series connection has at least one series resistor and at least one LED.
    Likewise, the invention relates to a method for symmetrizing the branches of a lighting device for vehicles with at least two parallel-connected LED branches, wherein each branch in series connection has at least one series resistor and at least one LED.
    The use of LEDs as a light source for vehicle lighting devices with different light functions offers not least design-wise new possibilities in the design of the individual lighting functions. An important parameter here is the number of LEDs used per light function. Due to the different designs of headlights, for example, the number of LEDs varies greatly. Typical numbers are normally one to ten LEDs operated in series for each light function. The design of the current drivers for such LED series branches strongly depends on the number of LEDs. Depending on the overall voltage of the LED branch, a down-converter, a boost converter or a step-up and down converter must be used. However, this variety of necessary converter topologies prevents the use of cost-optimized standard solutions. For example, a buck converter can be designed significantly more cost-effectively than a buck-boost converter.
    One approach to unifying or reducing the LED voltage is the parallel connection of LED branches, which allows low output voltages of the converters to be used, with the advantage that simple downconverters can be used. Depending on the number of LEDs, only the output current varies, but this does not significantly affect the choice of topology. The problem with the parallel connection of LEDs or LED branches, however, lies in the almost always required symmetrization of the LED currents. Depending on the LED type, LED specification, LED binning class and also depending on the placement of the LEDs and thus of the printed circuit board layout, different currents occur through the individual LED branches. (By "binning" is meant a classification of a LED production eg in terms of brightness, luminous flux, hue etc.) These different currents can lead to various disadvantages: the current asymmetry can result in a thermal overload of LEDs and, therefore, a reduction In addition, different currents result in different LED brightnesses and thus impair the homogeneity of the light distributions.
    An object of the invention is to provide a Symmetrierungsverfahren or a lighting device that allows easy balancing in order to work with comparatively low supply voltages and thus cost-effective voltage converters or power supplies.
    This object is achieved with a lighting device of the aforementioned type, in which according to the invention the at least one series resistor of each branch is bridged by a conductor section provided on a conductor carrier, this conductor section being accessible to a tool with the aid of which it can be severed.
    In this way, it is already possible in the course of production in a simple manner to compensate for any asymmetries of the individual branches.
    In some cases, it may also be expedient in the sense of precise balancing if the conductor section arranged on the conductor carrier is connected in series with a shunt resistor which is connected in parallel with a series resistor.
    In another advantageous embodiment, it can be provided that each branch has at least two series-connected series resistors, wherein at least one series resistor of the branch is bridged by a conductor section provided on a conductor carrier.
    A particularly practical embodiment of the invention provides that the conductor carrier is designed as a printed circuit board and the conductor sections are formed as conductor tracks of the printed circuit board.
    Also, the object underlying the invention is achieved by a method of the type specified above, wherein according to the invention, the at least one resistor of each branch is bridged by a ladder provided on a ladder section, this ladder section is accessible to a tool, with the help of which he severed is measured, the current through each branch and / or the brightness of at least one LED in each branch and in a branch, in which the measured current and / or the measured brightness exceeds a definable limit, the bridging conductor portion of the at least one series resistor by means of of the tool is severed.
    It is often useful if the arranged on the conductor carrier conductor section is arranged in series with a shunt resistor.
    It can also be provided in a meaningful way that each branch has at least two series-connected series resistors, wherein at least one bias resistor branch is bridged by a conductor section provided on a conductor carrier.
    A very expedient in practice development of the invention provides that the conductor carrier is a printed circuit board, the conductor sections are designed as conductor tracks of the printed circuit board and is used as a tool a Nutzentrenner for printed circuit boards.
    The invention together with further advantages is explained in more detail below by way of example embodiments, which are illustrated in the drawing. In this show
    1 shows a first beispielswese arrangement of parallel-connected LED branches, each having two LED and a series resistor connected in series,
    2 shows the arrangement according to FIG. 1 after cutting through a conductor section, FIG.
    3 shows an arrangement as shown in FIG. 1 but with two series resistors in each branch, FIG.
    Fig. 4 shows an arrangement as shown in Figure 1 but with four weighted series resistances in each branch, wherein in a branch a shunt resistor is indicated, and
    Fig. 5 shows an arrangement as shown in FIG. 1 but with four weighted shunt resistors in each branch, wherein in a branch in addition a series resistance is indicated.
    Reference is first made to FIG. 1, which shows a number of parallel branches ZW1, ZW2... ZWn of a lighting device for vehicles, each branch in the present case containing a series resistor RI, R2.. Series with two light-emitting diodes D11, D12 in the present case; D21, D22 ... Dnl, Dn2 is located. The parallel connection of these branches ZW1 ... ZWn is supplied by a power supply 1, this power supply being driven, for example, by a differential amplifier 2 which detects the current flowing through a series resistor Rg. The power supply 1 is arranged together with the differential amplifier 2 to regulate to a predetermined constant current and the power supply 1 includes, not shown here, a voltage source, e.g. a car battery. The power supply together with the aforementioned regulation is known and not the subject of the present invention.
    As can be seen from FIG. 1, each of the series resistors RI, R2... Rn is bridged by a conductor section LAI, LA2... LAn, this conductor section LAI... LAn being provided on any conductor carrier of any desired shape. In practical and proven embodiments, the conductor section is designed as a conductor or conductor track on a printed circuit board, which can carry other components, in particular the light emitting diodes and the control or a part of the control for the total current lg. Each of the series resistors RI ... Rn bridging conductor section LAI ... LAn is designed so that it can be easily severed by a tool, it being understood that after severing a corresponding conductor section, such as the conductor section LA2, the associated, bridged series resistor R2 becomes effective.
    In the following, the solution of the problem set out at the outset or the elimination of the disadvantages underlying the prior art will first be explained with reference to FIGS. 1 and 2.
    In order to allow low-cost step-down regulators, LED branches are connected in parallel in group sizes, provided that the occurring LED voltage of each branch in each operating state is smaller than the lowest input voltage. In the case of a 12 volt Bort network, the input voltage range is typically specified from 9 to 16 volts. With a typical maximum voltage of a LED of 3.5 volts, in this case only a maximum of two LEDs can be operated in one line, as shown in FIGS. 1 and 2.
    As already mentioned above, the problem with the parallel connection of LEDs is to balance the currents of the individual branches, whereby the total current lg of the entire LED arrangement is regulated. The actual current flowing through the respective LED branches adjusts due to the LED forward voltages. However, depending on the specification of the LEDs, this can mean large differences in LED brightness.
    The series resistors LAI ... LAn with the bridging and severable conductor sections have values which are selected according to the present LED specification. The power supply or regulation now controls to a total current lg of the LED array, which results from the addition of the individual LED branch currents II, 12 ... In, wherein the series resistors RI ... Rn first on the conductor sections LAI .. Are shorted. In general, these series resistors together with the conductor sections formed as conductor tracks are located on the printed circuit board layout.
    After the assembly of the printed circuit board, but before the separation of the printed circuit boards in the blank separator, a parameter test is now carried out on the LEDs. For this, the entire arrangement is e.g. Applied via a needle adapter with a current lg and it is the individual LED branch currents II ... In measured. This can be done either via an additional resistance in the LED branch or via a brightness measurement directly to the individual LEDs, the brightness measurement has the advantage of a lower component cost, as not yet an additional measuring resistor must be provided for each branch.
    If an asymmetry is detected in this measurement, i. a difference of the individual branch currents or LED brightness values, which exceeds a certain tolerable maximum value, the LED current in the LED branches with too high branch current or high brightness is reduced by the fact that in the initially bridged series resistor RI. The severing can be effected, for example, in a blank separator which is designed as a milling cutter and can, for example, mill a hole in the printed circuit board in order thereby to guide the conductor or conductor section 2 shows such a severed conductor section in branch ZW2, in which an excessively high current was previously measured. The released series resistor R2 now reduces the current in the branch and after the power splitter all LED branches are sufficiently balanced, ie they lead within certain tolerance limits the same current, so d also the brightnesses of all LED branches are equal or symmetrical.
    The embodiment of Fig. 3 is in principle the same as that of Figs. 1 and 2, but is intended to show that more than one series resistor can be provided in each branch. In the present case, two series resistors R11, R12 ... Rnl, Rn2 are provided in each branch. It is clear that a higher number of series resistors allows a more accurate balancing. In the present example of Fig. 3, as far as the resistance values of the serial series resistors of each branch are different, a total of four different currents can be set.
    The following Figures 4 and 5 are intended to show that other combinations of resistors and these bridging conductor sections to resistor networks are possible.
    4 shows that in each branch in series there are four series resistors with graded resistance values R, 2R, 4R and 8R, so that a high number can be achieved by cutting through the conductor sections LAU... LA14, which are parallel to each other and short-circuited to the series resistors Combinations are possible that give corresponding Vorwiderstandwerten for each branch. For the branch ZW2 it is shown that a series resistor, in this case the resistor LA21, can also be bridged by another resistor, which is here called a shunt resistor and is denoted by RN. This shunt resistor is also assigned in series a conductor section LN, which can be severed, whereby the parallel connection of the shunt resistor RN to the previous resistor LA21 is eliminated. It is clear that in this way an even finer graduation is possible. 5, in which each branch in series with the LEDs, here Dil and D12, is the parallel connection of four resistors and a conductor section, the resistors having the values R, V2R, V4R, VsR or the short-circuiting conductor section has the resistance OR. Analogous to the series circuit of FIG. 4, many possible combinations for each LED branch are given here. In Fig. 5 also in the branch ZW2 still a series resistor Rse is shown by dashed lines, which is bridged by a conductor portion, said conductor portion Lse can also be severed to allow the series resistance Rse to be effective.
    The resistors RN in Fig. 4 and Rse in Fig. 5 are intended to indicate that, in principle, even more complex resistor networks are to be understood by the term "at least one series resistor", which in practice understandably simpler configurations is preferred.
    Although in the illustrated embodiments, each branch includes two LEDs in series, this is not intended to preclude other LED configurations in each branch. Above all, it is at higher on-board voltages in vehicles, e.g. of 24 or 48 volts also possible to use more than two LEDs in a branch, despite the use of cheap buck converters. Likewise, combinations of series and parallel connections of LEDs are possible in principle in each branch.
    The cutting of printed conductors can of course also be carried out separately from the cutting of a benefit, wherein especially in a structure on printed circuit boards, the cutting can advantageously be carried out by means of a laser tool.
    权利要求:
    Claims (8)
    [1]
    claims
    1. lighting device for vehicles with at least two parallel-connected LED branches (ZW1, ZW2 ... ZWn), each branch connected in series having at least one series resistor (RI ... Rn) and at least one LED (Dil ... Dn2), characterized in that the at least one series resistor (RI ... Rn) of each branch (ZW1 ... ZWn) is bridged by a conductor section (LAI ... LAn) provided on a conductor carrier, this conductor section being accessible to a tool, with the help of which he is severable.
    [2]
    2. Lighting device according to claim 1, characterized in that arranged on the conductor carrier conductor portion (LN) in series with a shunt resistor (RN), which is connected in parallel with a series resistor (LA21).
    [3]
    3. Lighting device according to claim 1 or 2, characterized in that each branch (ZW1 ... ZWn) at least two series-connected series resistors (Rll, R12 ... Rnl, Rn2), wherein at least one series resistor of the branch by a on a conductor carrier provided conductor section (LAU ... LAn2) is bridged.
    [4]
    4. Lighting device according to one of claims 1 to 3, characterized in that the conductor carrier is designed as a printed circuit board and the conductor sections are formed as conductor tracks of the printed circuit board.
    [5]
    5. A method for symmetrizing the branches of a lighting device for vehicles with at least two parallel-connected LED branches (ZW1, ZW2 ... ZWn), each branch in series connection at least one series resistor (RI ... Rn) and at least one LED, characterized in that the at least one series resistor (RI ... Rn) of each branch is bridged by a conductor section (LAI ... LAn) provided on a conductor carrier, this conductor section being accessible to a tool with the aid of which it can be severed Current through each branch and / or the brightness of at least one LED in each branch is measured and in a branch in which the measured current and / or the measured brightness exceeds a definable limit, the bridging conductor portion of the at least one series resistor with the aid of the tool becomes.
    [6]
    6. The method according to claim 5, characterized in that arranged on the conductor carrier conductor portion (LN) is arranged in series with a shunt resistor (RN), which is connected in parallel with a series resistor (LA21).
    [7]
    7. The method according to claim 5 or 6, characterized in that each branch (ZW1 ... ZWn) at least two series-connected series resistors (Rll, R12 ... Rnl, Rn2), wherein at least one bias resistor branch by a on a Conductor conductor provided conductor section (LAU ... LAn2) is bridged.
    [8]
    8. The method according to any one of claims 5 to 7, characterized in that the conductor carrier is a printed circuit board, the conductor sections are formed as conductor tracks of the printed circuit board and is used as a tool a Nutzentrenner for printed circuit boards.
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    法律状态:
    优先权:
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    ATA50379/2015A|AT517122B1|2015-05-08|2015-05-08|Method for symmetrizing the branches of a lighting device for vehicles|ATA50379/2015A| AT517122B1|2015-05-08|2015-05-08|Method for symmetrizing the branches of a lighting device for vehicles|
    CN201680026752.2A| CN107926097A|2015-05-08|2016-05-03|Lighting apparatus for vehicle|
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    EP16736755.6A| EP3295772A1|2015-05-08|2016-05-03|Lighting device for vehicles|
    US15/803,341| US20180063920A1|2015-05-08|2017-11-03|Lighting device for vehicles|
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