• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    A method for feeding a series circuit of n LED units (LED1, .... LED5) and a controlled current source (5) from a voltage source (2) with fluctuating operating voltage (UB), in which shorted depending on the level of operating voltage individual LED units be in which at least as a function of the level of the operating voltage (UB) clocked and cyclically continuously changing ever k LED units (LED1, .... LED5) of the series circuit are short-circuited, at the same time (nk) LED units remain current-flow., and a corresponding circuit arrangement with a control unit (3) for driving the current source and a switch arrangement (4) with controlled switches (S1. .S4) assigned to the LED units, the control unit (3) for comparing the operating voltage and / or the current (IS) is set up by the series circuit with predeterminable threshold values, and, depending on this comparison, clocked and clocked cyclically constantly changing ever k short-circuit LED units of the series circuit via the associated switch, while at the same time (n-k) LED units remain current-carrying.
    公开号:AT516293A1
    申请号:T50670/2014
    申请日:2014-09-22
    公开日:2016-04-15
    发明作者:Julian Baker；Martin Biesenberger；Stefan Miedler
    申请人:Zizala Lichtsysteme Gmbh；
    IPC主号:
    专利说明:

    Method and circuit arrangement for feeding a series circuit
    FROM N LEO UNITS
    The invention relates to a method for feeding a series circuit of nLED units and a controlled current source from a voltage source with a fluctuating operating voltage, in which, depending on the level of the operating voltage, individual LED units are short-circuited.
    Furthermore, the invention relates to a circuit arrangement for feeding a series circuit of n LED units and a controlled current source and with a voltage source with fluctuating operating voltage, wherein the series connection of the LED units and the power source is connected to the voltage source, and with a control unit for driving the power source and a switch assembly with controlled switches associated with the LED units
    In the context of the invention, the term LED unit is understood to mean both a single light-emitting diode (LED) and a unit which consists of a plurality of LEDs connected in parallel and / or in series.
    For example, WO 2010 / 013177A1 discloses a switching matrix to which LED groups or individual LEDs are assigned, and which is connected to a voltage source and to a controllable current source. Furthermore, a control unit is provided which can control the individual switches of the switching matrix as well as the current source and which is set up to compare the voltage of the voltage source with voltage thresholds stored in a memory. In order to ensure satisfactory supply of the LEDs even in the event of strong fluctuations in the voltage source, the control unit is set up to switch all or part of the LEDs in series or parallel, depending on the voltage detected at the voltage source, in which case all conceivable combinations of series / parallel circuits possible are. The solution shown requires on the one hand LED three controlled switches and a correspondingly complex control logic, but above all there is the disadvantage that in the case of a Betriebssspannungsschwankung no uniform brightness of the LEDs used is guaranteed, but also one or more LEDs remain dark at all.
    It is an object of the invention to provide a method and a circuit arrangement for feeding a series circuit of n LED units, in which fluctuations of the operating voltage are compensated in a manner which minimally affects the appearance of the entire LED array, even if strong voltage fluctuations occur.
    This object is achieved by a method of the type mentioned, beiwelchem according to the invention clocked at least as a function of the amount of operating voltage and cyclically continuously changing each k LED units of the series circuit are short-circuited, at the same time (nk) LED units remain current-carrying ,
    It is expedient if selected at nominal operating voltage and normal Betriebszu¬stand k = 0 and the series circuit is fed with a constant current.
    An advantageous embodiment of the invention is characterized in that the selection of the LED unit / units which are short-circuited takes place with access to a stored memory function or is controlled by a random number generator.
    In a very expedient variant, in the case of short-circuiting of LED units, the current source is driven to change to a higher / lower value of the constant current.
    It can be provided that increases in a drop in the operating voltage of the current through the series circuit and / or at least one of the LED units cyclically continuous constantly changing shorted.
    In a useful variant, it is provided that the size of the current through the series connection is used as a measure of the operating voltage.
    To protect the LEDs used, it is useful if the current increase is in response to a temperature significant to the LED devices.
    In a practical embodiment, the duration of a clock is chosen between lps and 50 ms and preferably 5 ms.
    Likewise, the object is achieved with a circuit arrangement of the kind specified above, according to which the switch arrangement consists of n controlled switches bridging the LED units, the control unit is designed to compare the operating voltage with predefinable threshold values, and clocked in response to this comparison and cyclically durchlau¬fend constantly changing each k short-circuit LED units of the series circuit via the associated switches, while at the same time (nk) LED units remain current-flow.
    In practice, it is convenient if the duration of a clock is between 1 and 50 ms, and is preferably 5 ms.
    It is particularly expedient if the control unit is assigned a memory unit for storing information about maximum currents, respective actual values of voltages and currents and weights for the priority of specific LED units.
    It may also be beneficial if the control unit is associated with a random number generator.
    An expedient development of the invention is characterized in that the control unit is set up to reduce the operating voltage when the operating voltage drops
    To increase current through the series circuit and / or at least one of the LED units cyclically continuous constantly changing short circuit.
    The invention together with further advantages is explained in more detail below with reference to illustrative embodiments, which are illustrated in the drawing. Indies show
    1 is a block diagram of a circuit arrangement according to the invention,
    2 shows the part of a block diagram as in FIG. 1, but for a variant with respect to the control of the LEDs,
    3 shows, for example, a light distribution of an LED headlamp unit,
    4 shows a diagram relating to the timing of the driving of four LEDs according to a first variant of a method according to the invention,
    5 is a diagram relating to the timing of the driving of five LEDs according to a second variant of the method according to the invention,
    6 shows a flow chart for an embodiment of a method according to the invention and FIG
    Fig. 7 in four diagrams the timing of the control of four LEDs simultane- ous control of brightness variations over the current.
    Fig. 1 shows a block diagram of a first embodiment of a circuit arrangement according to the invention using the example of the control of four LEDs, hereinafter called LEDs. In this example, in a motor vehicle, by means of an energy management system 1, not shown in more detail, which primarily contains a generator and a charge controller, a vehicle battery 2 is, if possible, in a charged state with a nominal voltage of e.g. The actual battery voltage is designated Ub, it is during the ferry usually 13.5 to 15 volts.
    With this voltage Ub are now four series-connected LED units LED1, LED2, LED3 and LED4 are fed, which consist of individual LEDs in the simplest case and are also drawn for simplicity, but it should be clear that the LED units ever may comprise a plurality of LEDs, in particular on a chip. The LED units LED1, LED2, LED3 and LED4 are associated with a switching unit 4 controlled by a control unit 3, with a controlled current source 5 being provided for supplying the constant-current series circuit. The switching unit 4 at least offers the possibility of short-circuiting each of the four LED units by switches S1 .... S4 selectively and for a certain period of time. The switches S1 .... S4 are generally realized by switching transistors. The control unit 3 is connected to a memory unit 7 in which information about maximum currents, respective actual values of voltages and currents, weights of specific LED units with regard to their priorities, drive times, Maximum temperatures, last operated switches, etc. can be stored.
    In the variant illustrated in FIG. 2, it is provided that a number of light-emitting diodes or LED units D1 to D6, in the present example six, each with their two terminals are led to a switching matrix 4 'which has such a number of controlled switches Si has the fact that the LEDs D1 to D6 can in principle be connected in parallel or in series in any way. This corresponds to the state of the art, e.g. according to the aforementioned WO 2010 / 013177A1. Right InFig. 2, for example, the series circuit Dl-D2 // D3-D4-D5 // D6 connected for a specific operating case is shown. As will be explained in more detail below, the switching matrix 4 'serves to realize an emergency lighting function.
    Fig. 3 shows schematically the light distribution of a dipped beam, this dipped beam light being formed by a plurality of LED units. In the present case there are four LED units HD1, HD2, ASYM and VF, one of which forms the apron VF, two further forms the horizontal light-dark boundary HD1 and HD2, and the fourth LED unit forms the asymmetry ASYM of the low beam , In the present case, therefore, the designations HD1, HD2, ASYM and VF are used both for LED units and for the field they ever illuminated. This corresponds to a typical LED low-beam module used in practice, which is designed as a projection system with a multi-chamber reflector, wherein the chambers each have an associated LED unit and a total low beam is formed.
    This means that the number of partial light distributions depends on the design of the module, wherein, as already mentioned, an LED unit can also consist of several LEDs, which can be interconnected as required as LED unit in the sense of the invention, in turn, in turn to be able to create a defined number of partial light distributions. It should be noted that the interconnection of LEDs in certain embodiments leads to another Flussspan-nung or total voltage of the LED unit. The number of individually switchable partial light distributions is thus on the one hand dependent on the module and on the other hand dependent on the connection, but it can be varied within a certain range.
    In any case, in today's LED modules, the light image is always formed of several LED units, each forming a partial light distribution, so that an LED headlights, the generated light image always consists of several partial light distributions, of which certain partial light distributions for visibility to other road users are more important than others , Accordingly, some weighting / prioritization may be given to the individual partial light distributions which, in the event of a certain undervoltage, ensure at least visibility to other road users.
    In general one can say that the area (that partial light distribution) closest to the HV point (which is 25 cm above the light-dark boundary in the center of the light beam, an important concept of automotive lighting technology, in the photograph of that point where the horizontal and vertical intersect, that is the 0 ° / 0 ° point), preferably even a few degrees above the horizontal 0 ° line, must be given the highest priority / weighting since this range corresponds to the range in which other road users are the most likely to encounter other road users in this area. Depending on the situation, it may also be advantageous to prioritize precisely those areas which appear important from the driver's point of view, which thus do not serve for visibility to other road users but rather for the illumination of certain areas for the driver even appear important. For example, a weighting may also take place in terms of comfort, namely, such that those areas where the driver immediately notices that they appear darker are weighted lower.
    Alternatively, this function may cooperate with GPS, steering wheel sensor, tilt sensor, etc., to adapt the range of prioritization depending on roadholding; For example, in order to prioritize in cornering that LED unit which is adapted to light in the direction of the curve or at least indie width, since in such a situation, the prioritization of the partial light distribution in the vicinity of the HV point not the best choice would be. In other words, here the weighting taking into account the current driving situation.
    In the normal operating state, at a nominal operating voltage Ub, e.g. In the control unit 3, the instantaneous operating voltage Ub is constantly compared with the reference voltage Uref, and a decision is made on the basis of the values stored in the memory Intervention should take place because of a Unterspan-nung. In such intervention, LED units may be periodically short-circuited according to the method of the invention, or a change in the current Is through the series circuit may be directed to the controlled current source 5 by delivering a corresponding signal to the control unit 3.
    With reference to FIG. 4 in conjunction with FIG. 1, the method according to the invention, which can be realized by means of a circuit arrangement according to the invention, will now be explained. In the diagram shown, the time-dependent switching states of four LEDs LED1, LED2, LED3, LED4 are now illustrated, for the operating case that the operating voltage Ub has fallen to such a value that temporarily one of the four LEDs is always switched off, namely by one of the switches S1 .... S4 (Fig. 1) is short-circuited. The letters E and A on the ordinate axis mean "on" for the respective LEDs. or "Off".
    It can be seen in FIG. 4 that cyclically one of the four LEDs of the series circuit is respectively short-circuited, with three LEDs simultaneously remaining current-carrying. The short-circuiting occurs for such a duration or cycle length τ that no unpleasant flicker is recognizable to the human eye. In practice, for example, a clock duration τ = 20 ms may be selected, but generally clock rates of 1 ps to 50 ms may be useful. Furthermore you can see inFig. 4 that the entire switching operation cyclically with a period Τ = 4τabla.
    The illustration of Figure 4 also makes it clear that at any one time three of the four LEDs are on and one LED is off (shorted). The lower operating voltage only allows the operation of three LEDs instead of four LEDs (in normal operation), and not, as in the prior art, one of the LEDs remains constantly dark.
    Already at this point it should be mentioned that with appropriate Schaltungsdi¬mensionierung caused by the - periodic - failure of an LED Heilig¬ keitsabfall can be at least partially compensated by increasing the current through the series circuit.
    Furthermore, it should be mentioned that one will often seek to make the on and off flanks not too steep, but to flatten beyond the technically possible flank slope in order to avoid flickering and / or EMC technical disadvantages.
    In connection with Fig. 4, a simple special case has been dealt with which is intended to facilitate the understanding of the invention. The general case, however, is that the series circuit has n LED units, of which in each case k LED units are short-circuited as a function of the magnitude of the operating voltage, while at the same time current flows through (n-k) LED units. In case ofFig. 4 was thus n = 4 and k = 1.
    Starting from this consideration, FIG. 5 is considered, which refers to a series connection of five LED units LED1, LED2, LED3, LED4 and LED5 and is based on the assumption that the supply voltage Ub has fallen so far that always two of the five LEDs are short-circuited in order to ensure correct operation of the corresponding lighting device. Again, the clock length τ is drawn, however, the period corresponding to the number five of the LED units T = 5x. Analogous to the case explained with reference to FIG. 4, three of the five LEDs are switched on at any one time and two LEDs are switched off (short-circuited). The lower operating voltage is sufficient here only for three instead of five LEDs (in normal operation), and, as in the prior art, one or even more of the LEDs remain permanently dark. Of course, in the case of the series connection of five LED units with only a slight drop in the operating voltage Ub, only one LED can be periodically switched off.
    It should be noted at this point that the number of LEDs or LED units used can also be in the context of their forward voltage and the available operating voltage, in motor vehicles the on-board voltage, which may also be 24 volts or more.
    FIG. 6 shows an exemplary sequence diagram relating to the method according to the invention which, insofar as it is not self-explanatory, is explained here in addition:
    Starting from the switched-off state in step 10, in step 20 the switching-on takes place with the initialization of the control unit 3 in conjunction with the memory 7. In step 30, it is checked by means of the reference voltage or a nominal-actual comparison of the current through the series circuit the operating voltage Ub is large enough. If not, step 40 is to check how many LED units need to be turned off. The corresponding number k results in k = n - (Ub / Uled, rounded down).
    Analogous to this number results in a specific duty cycle of each LED unit in the corresponding period. Comparable with a pulse width modulation thus results in a duty cycle for each LED unit of (n-k) / n. In the example of four LEDs: at k = 1, 75% is obtained. Fig. 3, at k = 2 results in 50%, etc.
    If it has been determined in step 30 that Ub is large enough or the actual current is equal to the nominal value of the current (see explanation in the next paragraph), according to step 50 normal operation is present, all switches, e.g. Si to S4 in Fig. 1 are opened and the operation of the LED units is continuous, i. not pulsed. With advantage, a sequence can be provided in which the number of LEDs to be operated is increased step by step.
    Control over voltage thresholds is possible, but may be disadvantageous in practice, since the forward voltage of LEDs varies widely (production-related) and is dependent on current and temperature. A convenient regulation is to bypass the LEDs when the current drops. The power source tries to keep the current constant, it does not do this, e.g. because of undervoltage, the current sinks. By means of a current measurement, for example via a measuring resistor, a deviation of the actual value from a desired value (which is stored in the memory) can be carried out. For a defined deviation e.g. By -5% (to 95%) should first be shorted an LED. If the desired current can be reached, an LED is alternately short-circuited. If this is not the case, another LED must be shorted, etc.
    In order to switch over the current measurement then back to normal operation or. With the method of current measurement to check whether the operating voltage at all allows to be able to switch back to normal operation, one can operate all the LEDs for a short time (for example in a 10 g range, so that this switching is imperceptible to the eye). During this time, the current is measured. If the measured current corresponds to the desired current, namely the current which should flow in normal operation and whose value is stored in the memory 7, it is possible to proceed to normal operation (all switch open).
    In step 60, 70, 80 (optional) it is checked to what extent the current can be increased. Depending on the type of LEDs, LEDs can be operated with up to twice or even three times the current, but only for a short period of time (10 - 100 ms), which would otherwise drastically increase their temperature. The pulse duration is dependent on the current height and the temperature and is specified by the LED manufacturer. However, to compensate for brightness variations due to the reduced number of illuminated LED units, the current can be increased depending on the temperature up to a certain value.
    In other words, depending on the type and use of the LED unit, a maximum junction temperature must not be exceeded (via measurement of the contact temperature and the ambient temperature and / or power consumption, the junction temperature of the LED or of the LED can be determined by the manufacturer of the thermal resistance between barrier layer and contact point several LEDs of the LED unit are calculated). Generally, one will here measure a temperature that is significant for the (barrier) temperature of the LEDs, optionally also the ambient temperature can be detected.
    If the junction temperature is below a certain value, Is can be increased accordingly to prevent a decrease in the overall brightness of the LED unit string due to a clocked sequential shorting. Accordingly, Is is set to n / (n-k) times. For example, if one LED unit is turned off due to a power-supply reduction to 10 volts, 4 / (4-1) = 1.333 and Is can be increased to 133%. It should be noted that an LED loses efficiency with increasing current, in other words does not behave linearly. Consequently, one would have to set the current according to the manufacturer's instructions to a higher value in order to achieve a corresponding increase in light. For example, with a desired light increase of 33%, the current would have to be increased by approximately 40%.
    Preferably, the change of the current can be continuous time, thus giving rise to advantages both in the technical dimensioning of the current source 5 and in the EMC behavior.
    If the junction temperature is above a certain value, it is possible to increase Is, but only to a certain maximum value, in which it is ensured that an increase in this maximum value leads to no damage to the LED units. Of course, several thresholds can be used to achieve the most continuous compensation of brightness variations.
    In step 90 (optional) it is checked to what extent there is a drastic undervoltage, the corresponding comparison value being freely selectable depending on the system. For example, one could define an undervoltage as a voltage below 7 volts. Accordingly, when the operating voltage drops to, for example, 6 volts, step 110 would follow. Thus, a certain prioritization set in memory 7 would take place. As explained above, a kind of emergency lighting function can be realized therewith.
    On the other hand, at an operating voltage in the present example of more than 7 volts, the described cyclic switching of the LED units takes place.
    Depending on the design of the threshold value for an undervoltage, it is also possible, of course, in the example of four LED units, to switch through only three LED units, namely those three with the highest weightings / prioritizations. This allows a very variable range of use.
    In step 90, the LED units are successively switched through, wherein a memory function is used with access to the memory in order to avoid permanent shutdown of the same LED unit. For additional explanation, reference is made to the diagrams of FIGS. 4 and 5.
    Among other things, the memory function serves to reset the successive short-circuiting of the individual LED units as a result of a system-dependent reset after a "normal operation". to prevent, as shown in Fig. 7. Alternatively, instead of a flag function, a random generator could be used to prevent, for example, recurring equidistant short duration variations inhomogeneous use or aging of the LED units. With brief variations, a voltage dip is meant which, for example, results in always shorting only up to three of, for example, four LED units alternately. As already noted, the individual LED units can be prioritized in the control unit 3 or the memory unit 7 which is possibly assigned to it. This makes it possible to specify that only a limited, but defined number of LED units should be operated from a certain drop in the supply voltage Ub. For example, a headlamp module may include multiple groups of LED units, each of which
    Group is responsible for a footprint. For example, referring to Fig. 3, four groups may be assigned to the footprints HD1, HD2, ASYM and VF. In order to be able to provide at least sufficient visibility in the case of an undervoltage in relation to other vehicles, it is advantageous if, for example, that group which is responsible for the illumination ASYM has the highest priority, i. most heavily weighted.
    An example weighting could be: ASYM - HD1 - HD2 - VF. If an undervoltage or a drop in the current is detected by the control unit, then the apron VF can first be dimmed. It should further be noted that, for example, assuming a nominal operating voltage Ub = 12 volts, even when the operating voltage drops to Ub = 4 volts, one LED will normal by using cyclically passing clocking or shorting other LEDs and / or higher weighting can be operated.
    In the general case, the current distribution of the individual LED units or LEDs can be acted upon not only by a cyclical switching but also by driving the controlled current source, which will be explained below with reference to FIG.
    The starting point is a nominal operating voltage Ub = 12 volts of four LEDs or LED units which, according to the first diagram at the top of FIG. 6, decreases to 9 volts after a time span, reaches the nominal value of 12 volts again after a period of time t 2, and after one further period U drops back to 9 volts. Of course, the illustrated time course is simplified or idealized and it is merely intended to illustrate the invention.
    The above-mentioned second diagram of FIG. 7 corresponds, mutatis mutandis, to that according to FIG. 4, and shows the beginning of the cyclic switching-on or short-circuiting of an LED after the expiration of the time ti. After expiration of the time t2 is temporarily restored to the "normal operation". passed, in which all LEDs are energized and after the time t3 starts again the cyclic shorting of an LED.
    In the third diagram from the top of FIG. 7, the intervention on the controlled current source for the purpose of changing the current Is is shown. During the time ti, the current Is remains at its nominal value, here with "100%". designated. In order to obtain or at least partially compensate for the total luminous flux of the LED arrangement despite the cyclical switching off of an LED, the current Is can be temporarily increased, namely during the period ti, in the present case to approx. 140% of the nominal electricity. After expiration of the time t2, i. returning the operating voltage Ub to its nominal value, the current Is is restored to its nominal value of 100% to be increased again to 133% after the elapse of the time t3. The result can be seen in the bottom diagram of Fig. 6, which represents the luminous flux which does not change despite the temporary cyclic shutdown. Weighting is essential to the emergency lighting function, but cyclic switching (short circuiting) of the individual LED units is not required. The problem, as known from the prior art, is that a proper lighting depends directly on the operating voltage, in motor vehicles, the battery voltage. If the operating voltage Ub drops below a certain value (definable), for example due to a defective car battery, in which only one or, generally speaking, fewer than the total number of LED units are to be operated, this problem exists. For example, this would be the case even at 10 volts, if the forward voltage of the LED units (of course, depending on the interconnection, should an LED unit consist of several LEDs) at eg is about 3 volts. In this case, approximately 12 volts would be used for "normal operation". needed. Certain voltage levels that cause them to be within the threshold range between turning off a LED unit and not turning off may eventually be affected by a controllable resistance. At the above-mentioned operating voltage Ub of 10 volts, an LED unit can be short-circuited, so that in the example only a required voltage of about 3 x 3 volts = 9 volts results and the residual voltage of 1 volt on a series resistor or, as in the present example, a power source.
    It is essential that due to the weighting not just any LED unit short-circuited, but those with the lowest priority, in the present or. above-mentioned example would be that LED unit VF, which is to illuminate the apron.
    Returning to Fig. 2, it should be explained that in the case of emergency lighting, this function can be realized not only by shorting individual LED units, but also a fundamental change in their interconnection. For the case of four LED units, for example Two LED units in series with the parallel connection of two other LED units, whereby the required voltage is reduced by a quarter, resulting in the parallel-connected LED units only half the power and a correspondingly reduced light intensity.
    In the example of FIG. 2 with six LED units, in a particular emergency lighting situation (in particular due to a too low operating voltage) in the representation on the right, the LED units D 1 and D 4 are in full current and the LED units D 2, D 3, D 5 In principle, this also gives the opportunity to decide which LED units should be more important for the visibility of other road users and therefore should be reduced only to the last in their light intensity. Thus (if left to the right in the example of Fig. 2 shown) Dl and D4 would be more prioritized than D2, D3, D5 and D6.
    Thus, it is recognized that for emergency lighting, the classification of the LED units according to their priority is required to turn off a low priority unit, i. short-circuit. In addition, it is also possible for a periodically continuous short-circuiting of the remaining, not permanently short-circuited LED units to take place and also for a change in the current Is to be made use of by the controlled current source.
    权利要求:
    Claims (13)
    [1]
    Claims 1. A method for feeding a series connection of n LED units (LED1, .... LED5) of at least one lighting unit of a motor vehicle and a controlled current source (5) from a voltage source (2) with a fluctuating operating voltage (Ub), depending on Height of the operating voltage individual LED units are short-circuited, characterized in that clocked at least as a function of the height of the operating voltage (Ub) cyclically and continuously changing ever k LED units (LED1, .... LED5) of the series circuit are short-circuited with simultaneous flow of (nk) LED unit current.
    [2]
    2. The method according to claim 1, characterized in that selected at nominal Be¬ drive voltage (Ub) and normal operating state k = 0 and the series circuit with a constant current (Is) is fed.
    [3]
    A method according to claim 1 or 2, characterized in that the selection of the LED unit / units which are short-circuited occurs under access to a stored memory function or is controlled by a random generator.
    [4]
    4. Method according to claims 1 to 3, characterized in that in the case of short-circuiting of LED units (LED1 ... LED5), the current source (5) is driven to change to a higher / lower value of the constant current (Is).
    [5]
    5. The method according to claim 4, characterized in that at a drop in operating voltage (Ub) increases the current through the series circuit and / or at least one of the LED units cyclically continuously changing is short-circuited alternately.
    [6]
    6. The method according to claims 1 to 5, characterized in that as a measure of the operating voltage, the size of the current (Is) anzzo¬gen by the series circuit.
    [7]
    7. The method according to claim 5 or 6, characterized in that the Stromerhöhung in response to a temperature significant for the LED units.
    [8]
    A method according to any one of claims 1 to 7, characterized in that the duration (τ) of a clock is selected between lqs and 50 ms and preferably 5 ms.
    [9]
    9. Circuit arrangement for feeding a series circuit of n LED units (LED1, .... LED5) at least one lighting unit of a motor vehicle and a controlled power source (5) and with a voltage source (2) with a fluctuating operating voltage (Ub), wherein the series connection of the LED - Units and the power source is connected to the voltage source, and with a control unit (3) for driving the power source and a LED units associated switch assembly (4) with controlled switches (S1 .... S4), characterized in that the switch assembly n, each of the LED units (LED1, ...., LED4, LED5) über¬brückenden controlled switches (S1 .... S4), the control unit (3) for the comparison of the operating voltage and / or the current (Is) is set by the series circuit with predeterminable threshold values, and, depending on this comparison, clocked and cyclically continuously changing per k LED units of the series circuit via the Short circuit assigned switch, while at the same time (n-k) LED units remain energized.
    [10]
    Circuit arrangement according to Claim 8, characterized in that the duration of a clock is between 1 gs and 50 ms and is preferably 5 ms.
    [11]
    11. The circuit arrangement as claimed in claim 8 or 9, characterized in that the control unit (3) has a memory unit (7) for storing information about maximum currents, respective actual values of voltages and currents, maximum temperatures, last-activated switches and weights for the priority of the tuned LED Units is assigned.
    [12]
    12. Circuit arrangement according to one of claims 8 to 10, characterized gekenn¬zeichnet that the control unit is associated with a random number generator.
    [13]
    13. Circuit arrangement according to one of claims 8 to 11, characterized gekenn¬zeichnet that the control unit (3) is adapted to increase at a drop in the operating voltage (Ub), the current through the series circuit and / or cyclically at least one of the LED units cyclically constantly changing short circuit.
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    同族专利:
    公开号 | 公开日
    AT516293B1|2016-08-15|
    EP3013122A3|2016-05-18|
    CN105451411A|2016-03-30|
    CN105451411B|2019-05-21|
    EP3013122A2|2016-04-27|
    EP3013122B1|2019-10-23|
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    WO2009144024A1|2008-05-28|2009-12-03|Osram Gesellschaft mit beschränkter Haftung|Vehicle lighting device with at least two semiconductor lamp elements|
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    WO2012010388A1|2010-07-21|2012-01-26|Osram Gesellschaft mit beschränkter Haftung|Actuation of a lighting module|
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    法律状态:
    2016-11-15| HC| Change of the firm name or firm address|Owner name: ZKW GROUP GMBH, AT Effective date: 20161014 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50670/2014A|AT516293B1|2014-09-22|2014-09-22|Method and circuit arrangement for feeding a series circuit of n LED units|ATA50670/2014A| AT516293B1|2014-09-22|2014-09-22|Method and circuit arrangement for feeding a series circuit of n LED units|
    EP15182107.1A| EP3013122B1|2014-09-22|2015-08-24|Method and circuit assembly for supplying a series connection of n led units with power|
    CN201510605812.3A| CN105451411B|2014-09-22|2015-09-22|For supplying the method and circuit device of the series circuit of N number of LED unit|
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