• 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:
    The present invention relates to a multi-channel LED converter which has at least two converter stages clocked at high frequency with switches for supplying at least two parallel outputs for supplying LED loads and a control circuit, wherein signals are supplied to the control circuit at a circuit point and are multiplexed in time reproduce the current through the switches of the clocked converter stages, the control circuit (106) superimposing a low-frequency PWM modulation on the high-frequency clocking of the converter stages and selecting the phase position of the PWM pulses in such a way that the time center of the switch-on period of a PWM pulse a first converter stage is within 10% centered around the time center of the switch-off time of a PWM pulse of a second converter stage (103). The invention further relates to an LED lighting device which has such a multi-channel LED converter, and to a method for operating such a multi-channel LED converter.
    公开号:AT16555U1
    申请号:TGM160/2015U
    申请日:2015-06-22
    公开日:2020-01-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    MULTI-CHANNEL LED CONVERTER The present invention relates to multichannel systems, such as a multichannel LED converter for independently supplying multiple LED loads. In particular, the present invention relates to a multi-channel LED converter, an LED lighting device having such a multi-channel LED converter and a method for operating such a multi-channel LED converter.
    If the current control in a multi-channel system, such as a multi-channel LED converter, provided by a microprocessor (frequencies around 100 kHz), the analog-to-digital converter (AD converter / ADC) must be as possible every period can capture all channels, ie can measure the current of each channel in each period. If an AD converter with only one sample-and-hold circuit (S&H circuit) is used (or generally has fewer AD converters than channels), in a multi-channel system with x channels, each becomes Channel only recorded every xth period. Methods can now be used in which only those channels are measured which are also switched on or active. In particular if the channels are PWM modulated, there are time ranges in which channels are switched off or inactive. PWM modulations in the area of LED converters are already known from the prior art, for example DE 10 2005 054 541 A1, WO 2009/018958 A1 and WO 2012/045478 A1.
    It is an object of the invention in a multi-channel system, such as a multi-channel LED converter that uses fewer AD converters than channels (undersampling) to increase the effective sampling rate of the detection of the currents in the switched-on channels ,
    [0004] This object is achieved according to the invention by the features of the independent claims. The dependent claims further develop the central idea of the invention in a particularly advantageous manner.
    According to a first aspect of the invention, a multi-channel LED converter is provided with at least two converter stages clocked with high-frequency switches for supplying at least two parallel outputs for supplying LED loads and a control circuit, to which signals are supplied at a circuit point, which reproduce the current through the switches of the clocked converter stages in time-division multiplex, the control circuit superimposing a low-frequency PWM modulation on the high-frequency clocking of the converter stages, and the control circuit selecting the phase position of the PWM pulses in such a way that the time center of the switch-on period of a PWM Pulse of a first converter stage is within 10% centered around the time center of the switch-off time of a PWM pulse of a second converter stage.
    Thus, the invention provides a multi-channel LED converter with at least two LED channels, in which the phase position of the PWM pulses of the at least two LED channels are selected by the control circuit such that the time center of the switch-on time of a PWM pulse a first LED channel of the at least two LED channels lies within 20%, preferably 10% centered around the time center of the switch-off period of a PWM pulse of the second LED channel of the at least two LED channels. This is advantageous because it achieves the maximum possible equalization. Because the AD converter only detects or measures the current of switched LED channels, i.e. of LED channels in which the switch of the converter stage is clocked or switched at high frequency by the control circuit. In the case of only two LED channels, only one LED channel is switched on for as long a period as possible, so that the AD converter has to detect the current of only one LED channel during this period. The sampling rate for detecting the current or the switch current flowing through the switch is thus increased for the switched-on LED channel.
    [0007] Furthermore, the control circuit of the multi-channel LED converter according to the invention
    1/13
    AT 16 555 U1 2020-01-15 Austrian patent office can be set up to superimpose the high-frequency clocking of the converter stages on PWM modulations with different duty cycles, so that the PWM pulse of the first converter stage and the PMW pulse of the second converter stage have a different duty cycle exhibit. The control circuit can also be set up to superimpose the high-frequency clocking of the converter stages PWM modulation with the same duty cycle, so that the PWM pulse of the first converter stage and the PMW pulse of the second converter stage have the same duty cycle.
    This is advantageous because the brightness of the light emitted by an LED load can be dimmed by changing the duty cycle or duty cycle of a PWM pulse. The duty cycle or the duty cycle corresponds to the ratio of the switch-on period of a PWM pulse in comparison to the period of the PWM pulse. Thus, the brightness of the light emitted by the first LED channel, i.e. first converter stage, supplied LED load is emitted differently compared to the brightness of the light emitted by the second LED channel, i.e. second converter stage, supplied LED load is emitted. However, the two LED channels can also be supplied by the two LED channels in such a way that they emit light of the same brightness.
    The multi-channel LED converter according to the invention may further comprise an AD converter which is set up to measure the current through the switches of the at least two clocked converter stages and the signals from the control unit representing the current through the switches of the clocked converter stages feed in time multiplex.
    Furthermore, the AD converter of the multi-channel LED converter according to the invention can be set up to measure the current through the switch of a converter stage only during the duty cycle of the PWM pulse of the respective converter stage.
    This is advantageous because only the currents of the active LED channels, i.e. the currents through the high-frequency clocked or switched switches of the converter stages are measured, and thus the AD converter has to measure fewer currents in the event that not all LED channels are active than when the AD converter currents from both active and would measure inactive LED channels.
    Furthermore, each converter stage of the at least two converter stages of the multi-channel LED converter according to the invention can have a shunt resistor in series with the respective switch, the AD converter being set up to use the current through the switches of the at least two converter stages of the respective shunt resistance.
    This is advantageous because the shunt resistors (current measuring resistors) can be used to provide simple and cost-effective sensor units for detecting the current flow through the individual LED channels or the current flow through the switches of the individual converter stages of the multi-channel LED converter.
    Furthermore, each converter stage of the at least two converter stages of the multi-channel LED converter according to the invention can be a step-up converter or step-down converter, wherein the at least two converter stages can be the same converter stage types or different converter stage types.
    Furthermore, the multi-channel LED converter according to the invention can have four converter stages clocked at high frequency with switches, the control circuit selecting the phase position of the PWM pulses in such a way that the time center of the switch-on period of a PWM pulse of a first converter stage and a PWM pulse of a second Converter stage is within 10% centered around the time center of the switch-off time of a PWM pulse of a third converter stage and a PWM pulse of a fourth converter stage.
    This is advantageous because the phase position of PWM pulses is now selected in a 4-channel LED converter such that the time center of the switch-on period of the PWM pulses of two LED channels is centered around the 10% the midpoint of the switch-off time of the PWM pulses of the other two channels This gives one
    2.13
    AT 16 555 U1 2020-01-15 Austrian patent office maximum equalization possible, so that only two LED channels are switched on or active at the same time for as long as possible, i.e. Always show only two LED channels for PWM pulses. Since the current of an LED channel or through the high-frequency clocked switch of a converter stage is only measured during these switch-on times, the sampling rate for detecting the switch current is increased for each of the two LED channels active during this period.
    Furthermore, the control circuit of the multi-channel LED converter according to the invention with four converter stages can choose the phase position of the PWM pulses so that the time center of the switch-on time of the PWM pulse of the first converter stage is centered within 10% around the time center of the switch-on time of PWM pulse of the second converter stage and that the temporal center of the switch-off time of the PWM pulse of the third converter stage is within 10% centered around the temporal center of the switch-off duration of the PWM pulse of the fourth converter stage.
    The above-mentioned optional features can be combined in any way according to the invention to give the multi-channel LED converter according to the invention.
    According to a second aspect of the invention, an LED lighting device is provided which has at least two LED sections and a multi-channel LED converter according to the invention for operating the at least two LED sections, the multi-channel LED converter being set up to operate the LED sections according to at least one dimming value.
    Furthermore, the at least two LED sections of the LED lighting device according to the invention can have monochromatic LEDs and / or mixed light LEDs, in particular white light LEDs.
    [0021] Furthermore, the at least two LED sections of the LED lighting device according to the invention can emit light of different spectrum.
    The above-mentioned optional features can be combined according to the invention in any way to give the LED lighting device according to the invention.
    According to a third aspect, a method for operating a multi-channel LED converter according to the invention is provided, the multi-channel LED converter having at least two converter stages clocked at high frequency to supply at least two parallel outputs for supplying LED loads and one Control circuit, the control circuit being supplied at a circuit point with signals which, in time division multiplex, reproduce the current through one of the switches (T1, T2) of the clocked converter stages (102, 103), and wherein the high-frequency clocking of the converter stages (102, 103) is one in comparison, low-frequency PWM modulation is superimposed. Furthermore, the phase position of the PWM pulses is selected so that the time center of the switch-on time of a PWM pulse of a first converter stage is centered within 10% around the time center of the switch-off time of a PWM pulse of a second converter stage.
    Further advantages, features and characteristics of the present invention will now be explained in more detail with reference to the figures of the accompanying drawing.
    Fig. 1, Fig. 3 shows a preferred embodiment of a multi-channel LED converter according to the invention with two LED channels, i. with two converter stages to supply two parallel outputs to supply two LED loads.
    shows PWM pulses of three LED channels of a multi-channel LED converter and a corresponding sampling scheme.
    shows PWM pulses from four LED channels (PWM channels) of a 4-channel LED converter.
    3.13
    AT 16 555 U1 2020-01-15 Austrian Patent Office [0028] FIG. 4 shows PWM pulses from four LED channels (PWM channels) of a 4-channel LED converter according to the invention.
    1 shows the various components of a multi-channel LED converter 101 according to the invention.
    As can be seen in FIG. 1, the multi-channel LED converter 101 according to the invention has two converter stages 102 and 103 and thus provides two LED channels for the independent supply of two LED loads. Therefore, that is in figure. 1 shown multi-channel LED converter a 2-channel LED converter. According to the invention, the multi-channel LED converter 101 can also have more than two converter stages, i.e. have more than two LED channels to supply more than two LED loads.
    The converter stages 102 and 103 are shown by way of example in FIG. 1 as step-down converters. According to the invention, the converter stages are switching regulators with an actively clocked switch, such as a step-up or step-down converter or step-up or step-down converter (BoostConverter or Buck converter).
    The actively clocked switches T1 and T2 of the two converter stages 102 and 103 are controlled or switched via a control circuit 106. Control circuit 106 may be a microcontroller, an ASIC, a hybrid hybrid of the two, or any other control device known to those skilled in the art.
    A PWM unit 105 provides the control circuit with PWM pulses which correspond to dimming values for the LED channels.
    An AD converter (ADC) 107 converts the current flowing through the actively clocked switches T1 and T2 into digital signals and makes them available to the control circuit 106.
    The PWM unit 105 and the AD converter 107 can be realized by means known to the person skilled in the art.
    According to the invention, the AD converter 107 and the PWM unit 105 can be separate components of the multi-channel LED converter or can be part of the control circuit 106.
    It is also possible that the PWM unit 105 is arranged externally, i.e. is not part of the multi-channel LED converter 101, and thus the PWM pulses of the control circuit 106 from external, i.e. from outside the multi-channel LED converter 101.
    Furthermore, according to FIG. 1, the multi-channel LED converter 101 has a DC voltage supply 104 for supplying the two converter stages 102 and 103. However, this voltage supply 104 cannot also be part of the multi-channel LED converter 101, so that the converter stages 102 and 103 of the multi-channel LED converter 101 are then external, i.e. be supplied with voltage from outside the multi-channel LED converter 101.
    The control circuit 106 clocks or switches the two switches T1 and T2 of the two converter stages with a high clock frequency (several kHz) and superimposes the low-frequency PWM pulses (for example several 100 Hz) of the high-frequency clocking. Thus, the two converter stages 102 and 103 or the two LED channels of the multi-channel LED converter 101 are PWM-modulated.
    The current through the switches T1 and T2 is detected or measured by means of a respective shunt resistor (current measuring resistor) R1 and R2 and fed to the AD converter. The AD converter therefore measures the currents through the switches T1 and T2 of the two converter stages 102 and 103 by means of the two shunt resistors R1 and R2. The measured currents are then converted into digital signals and provided to the control circuit 106.
    Other sensor units known to the person skilled in the art can also be used for detecting the current through the switches T1 and T2.
    The switches T1 and T2 can be transistors, in particular MOSFET transistors or bipolar transistors. Other switches known to the person skilled in the art are also possible.
    4.13
    AT 16 555 U1 2020-01-15 Austrian Patent Office [0043] The AD converter 107 measures only the current through a switch of a converter stage at a time or during a clock cycle of the high-frequency clocking. Consequently, the AD converter 107 supplies the control circuit 106 with the signals reproducing the current through the switches of the converter stages of the multi-channel LED converter in a time-division multiplex manner.
    The converter stages 102 and 103 are used to operate LED loads which are connected to the outputs 1 and 2 of the multi-channel LED converter 101 shown in FIG. 1. The function of a converter stage is briefly explained below using converter stage 102 (the first LED channel) when an LED load is connected to output 1.
    The converter stage 102 is supplied with a DC voltage. When the switch T1 is switched on, current flows through the LED load LED 1, through the coil L1, which is thereby magnetized, and through the switch T1 and the shunt resistor R1. The AD converter detects or measures this current and supplies a signal to the control circuit 106 that reproduces this current. When switch T1 is switched off, the energy stored in the magnetic field of the coil is discharged in the form of a current via diode D1 and LED load LED 1.
    The control circuit 106 switches or clocks the switch T1 in such a high frequency that the measured current is adjusted to a desired value.
    In addition, the control circuit 106 of the high-frequency clocking (several kHz) of the switch T1 of the converter stage 102 superimposes a low-frequency PWM modulation, i.e. low-frequency PWM pulse train, (several 100 Hz) to achieve a dimming of the brightness of the light emitted by the LED load LED 1.
    As is already known to the person skilled in the art, the degree of dimming can be set by setting the duty cycle or duty cycle of the PWM modulation. The duty cycle or duty cycle corresponds to the switch-on time of a PWM pulse in relation to the period of the PWM pulse. During the switch-on period of the superimposed PWM pulse train, switch T1 is switched with the high-frequency frequency, and switch T1 is switched off during the switch-off period of the PWM pulse train. That during the switch-on period of the PWM pulse train, the converter stage 102 or the first LED channel of the multichannel LED converter 101 is active, whereas during the switch-off period of the PWM pulse train the converter stage 102 or the first LED channel of the multichannel LED converter 101 is active. Converter 101 is inactive.
    The AD converter 107 measures the current through the switch T1 only during the on period of the PWM pulse train, i.e. only if the converter stage 102 or the first LED channel of the multi-channel LED converter 101 is active. Consequently, the ad converter measures the current through the switch T1 only when it is switched or clocked by the control circuit 106 at a high frequency.
    As already mentioned above, the control circuit 106 can overlay the high-frequency clocking of the converter stages 102 with a PWM modulation which has a different duty cycle compared to the PWM modulation which overlaps the control circuit with the high-frequency clocking of the converter stage 103. The brightness of the light emitted by the LED load LED 1 can thus be set or dimmed differently in comparison to the brightness of the light emitted by the LED load LED 2.
    The control circuit 106 can, however, also superimpose the high-frequency clocking of the converter stages 102 and 103 on the same PWM modulation with the same duty cycle.
    The essence of the invention is not how the control circuit 106 or the PWM unit 105 sets the duty cycle of the PWM modulation in order to achieve a desired dimming level of the brightness of the light emitted by the respective LED load. This is already known from the prior art and, according to the invention, any implementation known to the person skilled in the art can therefore be selected for this.
    Rather, the essence of the invention lies in how the control circuit 106 determines the phase position
    5.13
    AT 16 555 U1 2020-01-15 Austrian patent office chooses the PWM pulses of the different converter stages of the multi-channel LED converter in order to increase the sampling rate of the single AD converter 107 of the multi-channel LED converter 101.
    Fig. 2 shows PWM pulses of three LED channels of a multi-channel LED converter and a corresponding sampling scheme of the AD converter. (It is thus assumed, according to FIG. 2, for example, that the multi-channel LED converter is a 3-channel LED converter with three outputs for the independent supply of three LED loads and has three converter stages, each converter stage having an LED channel corresponds and supplies an output of the 3-channel LED converter with electrical energy.) As can be seen from FIG. 2, all three LED channels are switched on simultaneously, ie the control circuit 106 simultaneously starts to clock the three converter stages at high frequency. After a certain on period, the PWM pulse of the first LED channel (LED channel 1) is switched off and therefore the control circuit 106 ends the high-frequency clocking of the converter stage of the first LED channel. The control circuit 106 continues the high-frequency clocking of the other two converter stages. After a further period of time, the PWM pulse of the second LED channel (LED channel 2) is also switched off and therefore the control circuit 106 ends the high-frequency clocking of the converter stage of the second LED channel. The control circuit 106 continues the high-frequency clocking of the converter stage of the third LED channel (LED channel 3) until the PWM pulse of this LED channel is also switched off.
    According to the sampling scheme for the AD converter 107 shown in FIG. 2, the AD converter only detects or measures the current of active LED channels. Furthermore, the AD converter only records the current of an active LED channel at a time or at a clock cycle of the high-frequency clocking. If all three LED channels are active, the AD converter only records the current of each LED channel in every third clock cycle of the high-frequency clocking. If only two LED channels are active, the AD converter only records the current of each active LED channel in every second clock cycle of the high-frequency clocking. If only one LED channel is active, the AD converter records the current of this one active LED channel in each clock cycle of the high-frequency clocking. The fewer LED channels are active, the higher the sampling rate of the AD converter for recording or sampling the current through the active LED channels.
    3 shows PWM pulses from four LED channels (also called PWM channels) of a 4-channel LED converter.
    As can be seen from FIG. 3, the temporal centers of the on-time of the PWM pulses of the four LED channels of the 4-channel LED converter are centered around the same point in time within a certain tolerance. This is a typical tuning of channels in a multi-channel system.
    This has the disadvantage that if there is only one AD converter in the multi-channel LED module, the switch current of each channel cannot be measured in every clock cycle of the high-frequency clocking during the switch-on period of the PWM pulses.
    4 shows PWM pulses from four LED channels (PWM channels) of a 4-channel LED converter according to the invention.
    As can be seen from FIG. 4, according to the invention, the phase position of the PWM pulses of the four channels is selected by the control unit 106 of the 4-channel LED converter in such a way, for example in a 4-channel LED converter, that the time center of the switch-on times the PWM pulses of two LED channels (PWM channel 1 and PWM channel 4) within a certain tolerance, in particular 10%, centered around the time center of the switch-off period of the PWM pulses of the other two LED channels (PWM channel 2 and PWM Channel 3).
    This optimized position of the midpoints of the PWM switch-on time
    13.6
    AT 16 555 U1 2020-01-15 Austrian patent office
    Impulses of the different LED channels, an optimized sampling (measurement of the switch current) is achieved by the AD converter for all LED channels even when using only a single AD converter.
    As can be seen from FIG. 4, a maximum possible equalization is achieved, so that in the longest possible time periods only two LED channels show turn-on times of PWM pulses (only in these turn-on times must the current be recorded or measured) what the sampling rate for the detection of the switch current by the AD converter is increased for each of the two LED channels active during this period.
    4, the control circuit according to the invention selects the phase position of the PWM pulses of the four LED channels so that the time center of the switch-on time of the PWM pulse of the first LED channel (PWM channel 1) within of 10% centered around the time center of the on-time of the PWM pulse of the fourth LED channel (PWM channel 4) and that the time center of the off-time of the PWM pulse of the second LED channel (PWM channel 2) is centered within 10% the time center of the switch-off duration of the PWM pulse of the third LED channel (PWM channel 3).
    4, the selection of the phase position of the PWM pulses by the control circuit 106 can also be used according to the invention for multi-channel LED converters which have fewer or more than four LED channels. In any case, the principle explained in accordance with FIG. 4 is to be applied when selecting the phase position of the PWM pulses of the different LED channels.
    Methods known to those skilled in the art can be used to implement this selection function in the control circuit.
    According to the invention, an LED lighting device is also presented, which comprises at least two LED sections and a multi-channel LED converter according to the invention with at least two converter stages (two LED channels) for supplying the at least two LED sections.
    The multi-channel LED converter according to the invention corresponds to the LED multi-channel LED converter described above with reference to FIG. 2 and the selection of the phase positions of the PWM pulses of the at least two LED channels by the control circuit is carried out as above with reference to Fig. 4 described.
    Each of the at least two LED paths can have one or more LEDs, which can be connected in series and / or in parallel. The one or more LEDs of each LED section can be monochromatic LEDs and / or mixed light LEDs, in particular white light LEDs. Furthermore, the one or more LEDs of each LED section can emit light of different spectrum.
    As already described above, the high-frequency clocking of the converter stages (of the LED channels) with PWM modulations, which have different duty cycles, can be superimposed, so that the brightness of the light emitted by the one LED path and the brightness of the emitted light can vary.
    The LED lighting device according to the invention can be used to implement multi-channel LED modules, such as, for example, tunable white modules, RGB modules, etc.
    权利要求:
    Claims (10)
    [1]
    1. Multi-channel LED converter (101), comprising:
    at least two converter stages (102, 103) clocked at high frequency with switches (T1, T2) for supplying at least two parallel outputs for supplying LED loads (LED 1, LED 2),
    a control circuit (106), to which signals are supplied at a circuit point, which reproduce the current through the switches (T1, T2) of the clocked converter stages (102, 103) in time multiplex,
    - The control circuit (106) of the high-frequency clocking of the converter stages superimposed on a low-frequency PWM modulation, characterized in that the control circuit (106) selects the phase position of the PWM pulses so that the time center of the switch-on period of a PWM pulse a first converter stage (102) is centered within 10% around the time center of the switch-off period of a PWM pulse of a second converter stage (103).
    [2]
    2. Multi-channel LED converter (101) according to claim 1, characterized in that the control circuit (106) is set up to superimpose the high-frequency clocking of the converter stages (102, 103) PWM modulations with different duty cycle, so that the PWM pulse of the first converter stage (102) and the PMW pulse of the second converter stage (103) have a different duty cycle, and that the control circuit (106) is set up to the high-frequency clocking of the converter stages (102, 103) PWM modulation superimposed with the same duty cycle, so that the PWM pulse of the first converter stage (102) and the PMW pulse of the second converter stage (103) have the same duty cycle.
    [3]
    3. Multi-channel LED converter (101) according to one of the preceding claims, characterized in that the multi-channel LED converter (101) has an AD converter (107) which is set up to switch the current through the switches ( T1, T2) of the at least two clocked converter stages (102, 103) and to supply the signals reproducing the current through the switches (T1, T2) of the clocked converter stages (102, 103) to the control unit (106) in time-division multiplex; and / or that the multi-channel LED converter (101) has an AD converter (107) which is set up to switch the current through the switch (T1, T2) of a converter stage (102, 103) only during the on-time of the Measure the PWM pulse of the respective converter stage (102, 103).
    [4]
    4. Multi-channel LED converter (101) according to claim 3, characterized in that each converter stage of the at least two converter stages (102, 103) has a shunt resistor (R1, R2) in series with the respective switch, and that the AD converter is set up to measure the current through the switches of the at least two converter stages (102, 103) by means of the respective shunt resistor (R1, R2).
    [5]
    5. Multi-channel LED converter (101) according to one of the preceding claims, characterized in that each converter stage of the at least two converter stages (102, 103) is an up-converter or down-converter; and / or that the at least two converter stages (102, 103) are the same converter stage types or different converter stage types.
    [6]
    6. Multi-channel LED converter (101) according to any one of the preceding claims, characterized in that the multi-channel LED converter (101) has four converter stages clocked at high frequency with switches, the control circuit (106) the phase position of the PWM pulses so chooses that time
    8.13
    AT 16 555 U1 2020-01-15 Austrian patent office focuses on the switch-on time of a PWM pulse of a first converter stage and a PWM pulse of a second converter stage within 10% centered around the time center of the switch-off period of a PWM pulse of a third converter stage and one PWM pulse of a fourth converter stage.
    [7]
    7. Multi-channel LED converter (101) according to claim 6, characterized in that the control circuit (106) selects the phase position of the PWM pulses so that the time center of the switch-on time of the PWM pulse of the first converter stage centers within 10% is around the time center of the on-time of the PWM pulse of the second converter stage and that the time center of the off-time of the PWM pulse of the third converter stage is centered within 10% around the time center of the off-time of the PWM pulse of the fourth converter stage.
    [8]
    8. LED lighting device, characterized in that the LED lighting device comprises:
    - at least two LED sections,
    - A multi-channel LED converter (101) according to claims 1 to 7 for operating the at least two LED sections, wherein the multi-channel LED converter (101) is set up to operate the LED sections according to at least one dimming value.
    [9]
    9. LED lighting device according to claim 8, characterized in that the at least two LED sections have monochromatic LEDs and / or mixed light LEDs, in particular white light LEDs; and / or that the at least two LED sections emit light of different spectrum.
    [10]
    10. Method for operating a multi-channel LED converter (101), comprising at least two converter stages (102, 103) clocked at high frequency with switches (T1, T2) for supplying at least two parallel outputs for supplying LED loads (LED 1, LED 2) and a control circuit (106),
    - Wherein the control circuit (106) signals are supplied at a circuit point, which reproduce the current through the switches (T1, T2) of the clocked converter stages (102, 103) in time division, and
    - The high-frequency clocking of the converter stages (102, 103) is superimposed by a low-frequency PWM modulation, characterized in that the phase position of the PWM pulses is selected so that the time center of the switch-on time of a PWM pulse of a first converter stage (102) is centered within 10% around the time center of the switch-off period of a PWM pulse of a second converter stage (103).
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    同族专利:
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    DE102015210189A1|2016-12-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102009040283A1|2009-09-04|2011-03-10|Tridonic Ag|Operation of pulse modulated LEDs|
    DE102010008275A1|2010-02-17|2011-08-18|Continental Automotive GmbH, 30165|Device for powering several LED units|
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    DE102007036978A1|2007-08-06|2009-02-12|Tridonicatco Gmbh & Co. Kg|Device and method for controlling the light output|
    DE112011103376A5|2010-10-08|2013-07-18|Tridonic Gmbh & Co. Kg|PWM dimming of bulbs|DE102018205589A1|2018-04-12|2019-10-17|Tridonic Gmbh & Co Kg|A multi-channel LED driver device for a plurality of LED modules, and a method of operating a multi-channel LED driver device|
    DE102018109045A1|2018-04-17|2019-10-17|Insta Gmbh|Dimming circuit for a non-inert light and dimming method|
    DE102019105953A1|2019-03-08|2020-09-10|HELLA GmbH & Co. KGaA|Control and / or regulating means, circuit arrangement and method for controlling light emitting diodes in a light emitting diode field|
    法律状态:
    2022-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20210630 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015210189.4A|DE102015210189A1|2015-06-02|2015-06-02|Multi-channel LED drivers|
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