• 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:
    An operating circuit (14a) serves to control an LED track (15), which has at least two LED types (r, w) of different spectrum for generating mixed light. In this case, the LED path (15) has a main branch (33) which contains at least one LED (26, 27a). The LED track (15) also has a compensation branch (32, 32a). The operating circuit (14a) is designed to act on the compensation branch (32, 32a) with a compensation current (I1)). The compensation current is clocked in dependence of a temperature signal which is detected directly or indirectly by a sensor, preferably pulse width modulated (PWM).
    公开号:AT15161U1
    申请号:TGM9020/2012U
    申请日:2012-12-21
    公开日:2017-01-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    METHOD AND CIRCUIT FOR GENERATING WHITE LIGHT BY LEDS
    The invention relates to a method and a circuit arrangement for generating mixed light of a predetermined color, in particular of white light, by mixing the light emitted by at least one first LED longer wavelength light with the at least one second LED emitted shorter wavelength light. The boundary between the longer-wavelength and the shorter-wavelength light may be, for example, 500 nm (with respect to the peak of the spectrum).
    It is known to produce mixed light of a predetermined color by mixing the light emitted from at least two LEDs, the light emitted by one LED and the other LED having different wavelengths. For example, "warm" white light can be obtained by mixing the light emitted by a red light LED and that of a color converted blue light LED or UV light LED (for example, an LED producing blue light or UV light Chip, which is covered with a phosphor layer which converts the blue light or the UV light into a longer wavelength light with a correspondingly different color) Alternatively, white light can also be produced by RGB (red, green, blue) mixture or other mixtures be generated.
    However, the problem arises that the color location of the mixed light in the CIE diagram changes with temperature. A change in temperature may be due to ambient temperature fluctuating or to the LED module heating up over time due to the operating current. In the latter case, a stable state is reached only after a certain warm-up time. This is usually at least 10 minutes, but can also last considerably longer.
    Temperature changes have the following reason color changes of the mixed light result: the higher the temperature rises in an LED module, the lower the intensity of the light emitted by the LEDs (at constant current through the LED). The gradient of the intensity as a function of the temperature is decreasing or, in other words, the gradient is negative. This would not be a problem in terms of the color of the mixed light, if the negative gradient of the longer wavelength LED light and the shorter wavelength LED light would be about the same. In fact, however, the negative gradient of longer wavelength LED light is greater than the negative gradient of shorter wavelength LED light, with the result that the spectrum of the mixed light changes.
    In addition, the efficiency of the phosphor layer may be temperature dependent.
    Thus, in a typical heating of an LED module, for example. From room temperature to 60 ° C to 80 ° C come to a color location shift, which is perceptible to the human eye.
    In the case of white light, the temperature dependency may also be expressed by a change in the color temperature.
    From WO 2011/054547 A1 it is known to use a passive compensation branch in an LED drive circuit, which reduces the voltage at one or more LEDs of a series circuit of LEDs as a function of the respective temperature by switching th to ground. However, part of the electric power is thermally converted by means of an NTC resistor, resulting in high power consumption. In addition, the temperature-induced color change is compensated only insufficient.
    The invention has for its object to counteract the described adverse phenomenon while achieving a high overall efficiency.
    The object is solved by the features of the independent claims. The dependent claims further form the central idea of the invention in a particularly advantageous manner.
    An operating circuit according to the invention serves to drive an LED track, which has for generating mixed light, at least two LED types different Spekt-rums. Preferably, one LED type is a monochromatic, for example, red LED, and the second type is a UV or blue, dye-converted white light LED.
    The LED track has a main branch, which includes at least one LED. The LED track also has a compensation branch. The operating circuit is designed to beat the compensation branch with a compensation current. The operating circuit is designed to act on the compensation branch depending on a temperature signal as a signal from a temperature directly or indirectly detect the sensor with a compensation current, the compensation current depending on the temperature signal clocked, preferably PWM is modulated. So no or only little power flows against mass. A high efficiency is achieved. At the same time a temperature change can be compensated.
    Preferably, the operating circuit further preferably has a processing device which adjusts the main current and the compensation current as a function of the temperature signal. The sensor preferably has a PTC resistor or an NTC resistor or a thermistor or a voltmeter. So a very accurate compensation is possible.
    Advantageously, the operating circuit has a switch which is controllable by the processing device. The switch then has a first switching state and a second switching state. In the first switching state, the switch permits a flow of the compensation current through the compensation branch and, in the second switching state, no flow of the compensation current through the compensation branch. Thus, the adjustment of the brightness ratios of the main branch and the compensation branch is very simple.
    Preferably, the processing means is designed to control the switch such that the clocking, preferably the pulse width modulation (PWM) of the compensation current to perform. The pulse width modulation then takes place as a function of a current temperature. Thus, an adjustment of the brightness distribution invisible to the human eye is possible without the need for disadvantageous dimming operations.
    The operating circuit preferably additionally has a return line which supplies a current temperature or a control parameter derived from a current temperature to a power source supplying it.
    Preferably, the main branch on at least one LED of a first type. Preferably, the compensation branch further comprises at least one LED of a second type. Preferably, the main branch includes only LEDs of the first type or LEDs of the first type and the second type. So a simple structure is possible.
    Alternatively, the main branch has at least one LED of a first type, while the compensation branch has no LED of a first type and no LED of a second type. Thus, a further simplification of the structure is possible.
    Preferably, the second LED type is an optional dye-converted red, amber-colored, orange, or infra-orange LED. Additionally or alternatively, the first LED type is an optional dye converted blue light LED or UV light LED.
    An inventive LED module includes an above-mentioned operating circuit and an LED supplied by this route.
    An LED lamp according to the invention includes an above-mentioned LED module.
    [0022] Preferably, the LED lamp according to the invention further includes a power supply circuit. The power supply circuit is then configured to set a total current for powering the LED module in response to a feedback signal corresponding to a current temperature or a control parameter derived from a current temperature. Thus, the required power can be further reduced while the color temperature and the brightness of the LED track are very precisely adjustable.
    Additionally or alternatively, the operating circuit can act on the compensation branch depending on a directly or indirectly transmitted brightness signal or the supply voltage with a compensation current, the compensation current is clocked depending on the temperature signal, preferably modulated pulse width modulated.
    An inventive method is used to operate an LED track. The. LED track then generates mixed light with at least two LED types of different spectrum. The LED track includes a main branch which includes at least one LED. A compensation branch is fed with an adjustable compensation current. The compensation current is clocked depending on a directly or indirectly detected temperature signal, preferably pulse width modulated.
    Further features, advantages and features of the invention will now be explained with reference to the figures of the accompanying drawings.
    [0026] FIG. 1 shows an exemplary LED lamp with an LED path; 2a shows a first embodiment of the device according to the invention in one
    Circuit diagram; 2b shows a second embodiment of the device according to the invention in one
    Circuit diagram; FIG. 3 A third exemplary embodiment of the device according to the invention in one embodiment. FIG
    Circuit diagram; 4a -
    4d shows various signals within a device according to the invention in timewise ablaut; 5 shows a first exemplary embodiment of the method according to the invention, and [0033] FIG. 6 shows a second exemplary embodiment of the method according to the invention.
    First, with reference to FIG. 1, the problem underlying the present invention will be explained with reference to an exemplary LED lamp. Subsequently, by means of FIGS. 2a-4, the structure and mode of operation of various forms of the device according to the invention will be discussed. Finally, the mode of operation of the method according to the invention will be clarified with reference to FIGS. 5-6. Identical elements have not been repeatedly shown and described in similar illustrations.
    Hereinafter, LEDs emitting red light (also referred to as "red LEDs") are representative of longer wavelength LEDs, while white light emitting LEDs (also referred to as "white or blue or color converted white or color converted blue LEDs") are representative stand for shorter-wave LEDs.
    The limit with respect to the peak of the spectrum between the longer-wavelength and the shorter-wavelength light may be, for example, 500 nm.
    Fig. 1 shows an exemplary LED lamp. Only the inner structure is shown. A power supply circuit 1 is connected directly to an LED module 2. The power supply circuit 1 includes a rectifier module 3, which generates a smoothed direct current from an alternating current. The alternating current is supplied to a grid connection 6. The power supply circuit 1 still includes a
    Current source 4. This generates from the direct current, which is generated by the rectifier module 3, a constant direct current I LED, which is the LED module 2 is supplied. Alternatively, a voltage source can be used. The LED module 2 here consists of a series connection of numerous LEDs. These are white and red LEDs.
    After the LEDs of the LED module 2 are connected in series, each LED is traversed by the same total current ILEd. At a constant temperature this ensures a constant color temperature of the resulting mixed light. However, if a temperature change, e.g. by changing the outside temperature or by heating due to the converted power, so there is a drift in the color temperature, since the different LED types have a different temperature characteristic.
    In Fig. 2a, a first embodiment of the LED lamp according to the invention is Darge. The LED lamp according to the invention includes a power supply circuit 10 and an LED module 11. The structure of the power supply circuit 10 corresponds to the structure of the power supply circuit 1 of FIG. 1. The rectifier module 12 corresponds to the rectifier module 3. The current source 13 corresponds to the current source 4. Alternatively can also be used here a voltage source.
    The total current Led is generated by the power supply circuit 10 and supplied to the LED module 11. The LED module 11 shown here is an LED module according to the invention. The LED module 11 includes a drive circuit 14a according to the invention and an LED track 15.
    The LED section 15 also consists of a series connection of several LEDs 20 -26. The LEDs 21-26 are white LEDs of a first type (w). The LED 20 is a red LED of a second type (r). In addition to the serially connected LEDs 20-26, the LED track 15 includes a compensating branch 32 connected in parallel. It is connected in parallel to a main branch 33, which here only contains the LED 26. The compensation branch 32 includes an ohmic resistor 28 and an LED 27. The LED 27 is here of the second type (r). At the connection point between the compensation branch 32 and the main branch 33, the total current ILed is divided into a compensation current Ii and a main current I2. The compensation current h flows through the compensation branch 32, while the main current I 2 flows through the main branch 33. The ohmic resistor 28 serves only to equalize the voltage drop across the LED 27 to the voltage drop across the LED 26. Due to their different types (r, w), the LEDs 27 and 26 have a different voltage drop.
    The operating circuit 14a in this case has a switch 29, which is controlled by a micro-controller 31. The switch 29 is controlled by the microcontroller 31 such that a pulse width modulation is performed. That the ratio of the compensation current h to the main current I 2 is adjusted by means of pulse width modulation by the switch 29. By adjusting the ratio between the compensation current und and the main current I2, the average brightness of the LED 27 and the LED 26 is adjusted. Since the LEDs 26, 27 emit different spectral ranges, so the color temperature of the entire LED track 15 can be adjusted.
    The pulse width modulation is set by the microcontroller 31 in dependence on a current temperature. The current temperature is determined by means of a sensor. In Fig. 2, the sensor is a temperature-dependent resistor (PTC resistor) 30. Alternatively, however, NTC resistors or thermistors are also conceivable. In addition, as a sensor, a voltmeter can be used, which measures the falling across the entire LED track 15 voltage. Also with regard to this parameter results in a temperature characteristic.
    Depending on the resulting sensor signal, the microcontroller 31 sets the pulse width modulation such that a constant color temperature of the LED track 15 results.
    The total current ILed is fully utilized for operation of the LEDs 20-27. This results in a very high overall efficiency. The ohmic resistor 28 has only a very small value, since it only serves to compensate for the slightly different voltage drop of the different LED types (r, w). Thus, the ohmic resistor 28 has only a very small negative impact on the overall efficiency.
    2b shows a second embodiment of the LED lamp according to the invention. The embodiment corresponds largely to the embodiment of Fig. 2a.
    The compensation branch 32a here corresponds to the compensation branch 32 of FIG. 2. However, the compensation branch 32a does not include any components here, but merely represents a bridging of the main branch 33a connected through the switch 29. The main branch 33a corresponds to the main branch 33, but includes instead of the LED 26 of the first type (w), an LED 27a of the second type (r). The targeted, preferably clocked circuit of the switch 29 can also be used to set the resulting color temperature.
    In Fig. 3, a third embodiment of the LED lamp according to the invention is Darge. Compared with FIG. 2, only the operating circuit 14b is changed here. In addition to the control of the pulse width modulation via the switch 29 by the microcontroller 31, a control of the total current ILed takes place here additionally. This control ensues via a feedback lead 35, which transmits a control signal of the microcontroller 31 to the current source 13 of the power supply circuit 10. Such control serves to further improve the color stability. Thus, the temperature of the power requirement of an LED changes with the temperature in order to achieve a constant brightness. Depending on their brightness, many LEDs have a color characteristic. That At different brightnesses of the operation results in a different color characteristic.
    By controlling the total current ILed as a function of the current temperature, this effect can be avoided. That When the temperature is changed, the total current Led is increased or decreased in order to achieve a constant overall brightness and thus also a constant color temperature.
    Instead of a control signal of the microcontroller 31, the sensor signal or a signal indicative of the temperature can also be fed back directly. The determination of the suitable current intensity then takes place on the part of the power supply circuit 10.
    Numerous signals in an LED lamp according to the invention are shown in timed sequence in FIGS. 4a-4d. Fig. 4a shows the switching behavior of the switch 29 and thus the pulse width modulation. Before time t1, the switch is open for about the same amount of time as closed. After time t1, the turn-on time is significantly reduced. The time t1 here corresponds to e.g. a significant temperature reduction.
    4d shows the total current ILed. It can be clearly seen here that the total current I led is constant both before time t1 and after time t1. However, if total current control is performed as a function of temperature, the total current also changes with the temperature change at t1.
    Fig. 4b shows the compensation current L. It can be clearly seen here that the compensation current h flows during the switch-on time of the switch 29 and does not otherwise flow.
    In Fig. 4c, the main current is shown l2. It can be clearly seen here that the main current I 2 corresponds to the total current ILed as long as the switch 29 is open. When the switch 29 is closed, the main current I 2 corresponds to the total current I LED, minus the compensation current h.
    The pulse width modulation takes place in a speed that is not perceptible to the human eye. For the human eye, this results in a color perception, which corresponds to the time average over the pulse width modulation.
    5, a first embodiment of the method according to the invention is shown. In a first step 40, temperature parameters are determined. That A signal is being measured, and we as the aeraser of Ltulebecke are exactly alienated. In a second step 41, the brightness ratio to be set between the main branch and the compensation branch is determined, which is necessary in order to achieve a desired color temperature at the currently measured temperature. For this purpose, the current temperature is first determined based on the measured temperature parameters. Based on the current temperature, the duty cycle of the pulse width modulation is determined. The intermediate step on the determination of the current temperature can also be omitted. Then the duty cycle is determined directly from the measured temperature parameters. This determination can be made via a calculation rule or via a table stored by the microcontroller.
    In a third step 42, the pulse width modulation determined in the second step 41 is performed. That the current through the compensation branch is turned on / off. Since the total current lLED is distributed over the main branch and the compensation branch, the main current l2 is set at the same time. To be continued with the first step 40.
    The sequence shown is repeated as often as desired during the entire operating life of the LED track. Since changes in temperature of the LED track are usually rather long-term nature, it is sufficient if the steps at least once per minute, preferably at least once per 10 seconds, more preferably at least once per second are performed. The method shown here corresponds to the arrangement of FIG. 2.
    In Fig. 6 shows a second embodiment of the method according to the invention is Darge. The method shown here corresponds to the arrangement of FIG. 3.
    The steps 50, 51 and 53 correspond to the steps 40 - 42 of FIG. 5. In addition, a step 52 between the step 51 and the step 53 is included. In step 52, in addition, the necessary total current Led is set based on the current temperature.
    Additionally or alternatively, the operating circuit (14a, 14b) the compensation branch (32) also act on a directly or indirectly transmitted brightness signal or the supply voltage with a compensation current (h), the Kom pensationsstrom clocked depending on the temperature signal, is preferably modulated pulse width modulated (PWM).
    The invention is not limited to the illustrated embodiment. All features described above or features shown in the figures can be combined with each other in any advantageous manner within the scope of the invention.
    权利要求:
    Claims (18)
    [1]
    claims
    An operating circuit (14a, 14b) for an LED track (15) having at least two LED types (r, w) of different spectrum for generating mixed light, the LED track (15) having a main branch (33 , 33a), which comprises at least one LED (26, 27a), characterized in that the LED track (15) has a compensation branch (32, 32a), and that the operating circuit (14a, 14b) is formed, the compensation branch (32, 32a) depending on a temperature signal as a signal from a temperature directly or in-directly detecting sensor (30) to act on a compensation current (L), wherein the compensation current (L) depending on the temperature signal clocked, preferably pulse width modulated (PWM) is modulated.
    [2]
    Second operating circuit (14a, 14b) according to claim 1, characterized in that the operating circuit (14a, 14b) comprises a processing means (31) which adjusts the main current (l2) and the compensation current (l-i) as a function of the temperature signal.
    [3]
    Third operating circuit (14a, 14b) according to claim 2, characterized in that the sensor (30) comprises a PTC resistor or an NTC resistor or a thermistor or a voltmeter.
    [4]
    4. operating circuit (14a, 14b) according to one of claims 1 to 3, characterized in that the operating circuit (14a, 14b) comprises a switch (29) which is controllable by the processing device (30) that the switch (29) a first switching state (ON) and a second switching state (OFF) that the switch (29) in the first switching state (ON) allows a flow of the compensation current (h) through the compensation branch (32, 32 a), and that Switch (29) in the second switching state (OFF) does not allow a flow of the compensation current (li) through the compensation branch (32, 32a).
    [5]
    5. operating circuit (14a, 14b) according to claim 4, characterized in that the processing means (30) is adapted to the switch (29) to control the timing, preferably the pulse width modulation (PWM) of the compensation current (1-0 to reach.
    [6]
    Operating circuit (14b) according to one of Claims 1 to 5, characterized in that the operating circuit (14b) has a return line (35) which displays a current temperature or a current temperature-derived control parameter of a power source supplying it (14b). 13) feeds.
    [7]
    7. operating circuit (14b) according to one of claims 1 to 6, characterized in that the main branch (33) at least one LED (26) of a first type (w), that the compensation branch (32) at least one LED (27) of a second type (r), and that the main branch (33) includes only LEDs of the first type or LEDs (26) of the first type (w) and of the second type (r).
    [8]
    8. operating circuit (14a, 14b) according to one of the Anspmche 1 to 6, characterized in that the main branch (33a) at least one LED (27a) of a first type (w), that the compensation branch (32a) no LED of a first type (w) and no LED of a second type (r).
    [9]
    9. operating circuit (14a, 14b) according to one of Anspmche 1 to 8, characterized in that the second LED type (r) is an optional color-converted red, amber, orange, o-the infra-orange LED, and / or that the first LED type (w) is an optional color-converted blue light LED or UV light LED.
    [10]
    10. LED module (11), comprising an operating circuit (14a, 14b) according to any one of claims 1 to 9, and one of these supplied LED track (15).
    [11]
    11. LED lamp, in particular for white light, in particular retrofit LED lamp, having at least one LED module (11) according to claim 10.
    [12]
    12. LED lamp according to claim 11, characterized in that the LED lamp further comprises a power supply circuit (10), and that the power supply circuit (10) is formed in response to a feedback signal, which a current temperature or a derived from a current temperature control parameter corresponds to set a total current (ILEd) to supply the LED module (11).
    [13]
    13. A method for operating an LED track (15), which generates mixed light with at least two LED types (r, w) of different spectrum, wherein the LED track (15) has a main branch (33, 33a), which at least one LED (26, 27a), characterized in that a Kompensationszweig (32, 32a), depending on a temperature signal as a signal which detects the temperature directly or indirectly detected with a compensation current (h), wherein the compensation current (h ) is clocked depending on the temperature signal, preferably pulse width modulated (PWM).
    [14]
    14. The method according to claim 13, characterized in that in dependence of the temperature signal of the main current (l2) and the compensation current (h) can be adjusted.
    [15]
    15. Method according to claim 13 or 14, characterized in that the main branch (33) has at least one LED (26) of a first type (w) that the compensation branch (32) comprises at least one LED (27) of a second type (r) and that the main branch (33) includes only LEDs of the first type or LEDs (26) of the first type (w) and of the second type (r).
    [16]
    16. The method according to any one of claims 13 or 14, characterized in that the main branch (33a) has at least one LED (27a) of a first type (w) that the compensation branch (32a) is not a first type LED (w) and none LED of a second type (r).
    [17]
    17. The method according to any one of claims 13 to 16, characterized in that the second LED type (r) is an optional color-converted red, amber, orange, o-the infra-orange LED, and / or that the first LED type (w ) is an optional color converted blue light LED or UV light LED.
    [18]
    18. The method according to any one of claims 13 to 17, characterized in that a total current (ILed) through the LED path (15) is set in dependence on a current temperature or derived from a current temperature control parameters. For this 6 sheets of drawings
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    同族专利:
    公开号 | 公开日
    DE102012203746A1|2013-06-27|
    WO2013090956A1|2013-06-27|
    引用文献:
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    法律状态:
    2018-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20171231 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011089870|2011-12-23|
    PCT/AT2012/000323|WO2013090956A1|2011-12-23|2012-12-21|Method and circuit arrangement for generating white light by means of leds|
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