EP2368407A1 - Verfahren und vorrichtung zum betreiben von gruppen von leds mittels pwm - Google Patents
Verfahren und vorrichtung zum betreiben von gruppen von leds mittels pwmInfo
- Publication number
- EP2368407A1 EP2368407A1 EP09799347A EP09799347A EP2368407A1 EP 2368407 A1 EP2368407 A1 EP 2368407A1 EP 09799347 A EP09799347 A EP 09799347A EP 09799347 A EP09799347 A EP 09799347A EP 2368407 A1 EP2368407 A1 EP 2368407A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pwm
- frequency
- temporarily
- arrangement
- lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000002123 temporal effect Effects 0.000 claims abstract 2
- 230000000712 assembly Effects 0.000 claims description 10
- 238000000429 assembly Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 5
- 238000005286 illumination Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000003086 colorant Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical feedback
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- the invention relates to a device and method for operating lamps.
- Such devices are used in lighting systems to provide colored or flat lighting
- LED organic or inorganic light emitting diodes
- Light source used The efficiency and luminous efficacy of light emitting diodes is being increased more and more so that they are already being used in various general lighting applications.
- light emitting diodes are point sources of light and emit highly concentrated light.
- the PWM control takes place simultaneously, i. the switch-on edges of all PWM signals are simultaneous.
- the frequency of one or more PWM signals is at least temporarily not constant in time, and / or
- the frequency of at least one PWM signal at least temporarily deviates from the at least one further PWM signal.
- the inventive solution further relates to a device for operating at least two light sources, wherein by a common electrical supply unit electrical energy to at least two lamp assemblies, each consisting of one or more lamps, is provided, wherein a first lamp arrangement and at least one second lamp arrangement electrical Energy is supplied in the form of PWM packets, wherein the timing of the PWM packets is tuned between the different illuminant arrangements.
- Fig. 2 shows a further device according to the invention for operating LED
- FIGS 3 and 4 show sequences of the PWM packets according to the invention.
- This device has a driver module, and an LED module controlled by the driver module with at least one LED 5, with a memory for
- the memory may be contained either in the driver module or in the LED module and the information in the memory can be changed.
- the memory may be included in a driver module 1.
- the driver module 1 has terminals 2 and 3 to which an LED or a plurality of LEDs 5 can be connected via the wiring 4.
- the LEDs 5 may be located on a common LED module.
- the individual LEDs 5 can be controlled via different output stages, drivers or converters.
- the information in the memory can be changed based on a calibration measurement.
- the information in the memory can be changed by a correction factor.
- the information in the memory may be modified by a correction factor that has become due to a calibration measurement.
- the correction factor can be changed by a user, for example via a specification via an interface 7.
- the interface can use both a wired and a wireless transmission.
- the correction factor may depend on the aging or the operating time of the LED module.
- the correction factor may depend on the temperature of the LED module.
- a sensor 6 can be used, which is introduced into the illumination system for the calibration measurement.
- the correction factor may depend on a color measurement.
- the color measurement can be done by means of an RGB color measurement, for example a CCD sensor. In this case, the sensor 6 would be an RGB color sensor.
- the determination of the correction factor can be repeated at regular intervals.
- the memory can be read out by the driver module via a digital interface.
- the memory can be located on the LED module and can be read by the user when the module is replaced.
- the memory may be located on the LED module and prior to replacement of the module by the driver module due to user signaling be read out.
- the memory may be placed in a Kalibriergerat.
- the signaling for reading the memory on the LED module can be done by the user by a switching sequence on the supply voltage, a digital control command or by other signaling.
- the information read out can be stored in the memory of the new LED module.
- the driver module can forward the information stored in memory via a digital interface to other driver modules.
- one or more LED modules can be switched off.
- only one LED module can be switched on at a time.
- the color measurement can be performed with a color sensor (eg CCD sensor).
- a color sensor eg CCD sensor
- the color sensor may be placed so that it can receive a portion of the light emitted by the LED modules.
- the color sensor can be placed so that it is shielded from ambient light and can only receive light emitted by the LED modules. This foreclosure can be done by a cover that is specially designed for the calibration measurement. On this cover 11, the sensor 6 may be located. The sensor 6 can also be on the reflector 10 of the LED Luminaire be placed. The sensor 6 may be placed to directly or indirectly receive the light of the LED 5 of the LED module.
- the color location and the intensity of the LED 5 can be stored.
- the individual LED modules can be switched on and calibrated one after the other.
- the calibration can be used to determine the colors of the connected LED modules.
- the individual colors or color locations as well as the intensities of the respectively driven LEDs 5 are determined. From the combination of the individual calibration measurements, which are carried out in succession, the assignment of the colors and the mixture of the individual LEDs 5 required for the output of a desired color by the LED illumination can be determined.
- the driver module may include a switching regulator, such as an AC-DC converter, a DC-DC converter, a current sink, or a power source.
- the driver module may include a PFC (Active Power Factor Correction Circuit), or a PFC (Active Power Factor Correction Circuit) may precede the driver module.
- the driver module can have a potential separation.
- the operation of the LEDs can be such that the LED module is driven by at least one LED from a driver module, and a memory for storing information about the LED module is present, wherein Information can be stored or modified in memory. The information in the memory can be changed based on a calibration measurement.
- the driver module can be formed by a switching regulator or by a current sink or a current source. If a switching regulator is used as the driver module, then it can internally operate at a higher frequency than the frequency with which the LED or the LED module is controlled.
- the internal frequency with which the switch of the switching regulator is controlled can be in the range of 1OkHz to several MHz, while this internal frequency is superimposed on a low frequency corresponding to the frequency of the at least one PWM packet.
- the information in the memory can be changed by a correction factor.
- a method for operating at least two light sources wherein electric energy is provided to at least two illuminant arrangements, each consisting of one or more bulbs, by a common electrical supply unit, wherein a first illuminant arrangement and at least one second illuminant arrangement contains electrical energy Form of PWM packets is supplied, wherein the timing of the PWM packets is tuned between the different illuminant arrangements.
- FIGS. 3 and 4 Examples for the control of three illuminant arrangements are shown in FIGS. 3 and 4 represented, wherein the lamp assemblies electrical energy can be supplied in the form of PWM packets.
- the at least two illuminant arrangements can be controlled such that the time center of a
- FIG. 4 shows an example of a control with an offset of the time centers of the individual PWM signals.
- the timing of the PWM packets can be coordinated over the entire dimming range of the lamps.
- the at least two illuminant arrangements can be controlled so that, alternatively or additionally, the time centers of the PWM packets of the illuminant arrangements are shifted in time relative to one another with an offset value, so that the flanks of the PWM packets to the illuminant arrangements do not occur at the same time.
- the switch-on edge of at least one of a plurality of parallel PWM signals may be shifted in time to at least one further PWM signal, so that the problem of simultaneous PWM control no longer exists.
- This offset (offset value) can be internally or externally variable or fixed.
- the offset could correspond to the entire turn-off phase of a PWM signal, ie, with the keying ratio unchanged, the corresponding LED within a PWM period becomes first switched off and then turned on.
- a PWM signal can therefore be inverted, ie at the start of each cycle, triggered by an interrupt signal, for example, the switch-off phase and only then the switch-on phase of the LED can be controlled.
- the offset could also be chosen such that the turn-on edges for the PWM signals are generated uniformly distributed over the PWM period.
- a third alternative is to randomly select offset.
- FIG. 3 shows an example of a control with an offset of the individual PWM signals.
- the offset may already be present during the generation of the PWM signals, or else be inserted deliberately in the case of simultaneously generated PWM signals on the path between the PWM generation and the LEDs.
- the PWM signals can be generated starting from one or even from several clocks.
- the offset value can depend on the dimming level of the
- Illuminants are selected.
- the frequency of at least one PWM signal at least temporarily from the distinguish at least one other PWM signal.
- one or more clocks may be present.
- one frequency may be a multiple of another frequency.
- At least one frequency can be shifted after generation of uniform PWM switching frequencies, for example by a capacitor.
- the required PWM control value can be calculated independently and the result written to a hardware register.
- the hardware then adopts the new value at the next zero crossing of the period.
- the center PWM method (triangle as shown in Fig. 4) comes at different PWM position none of the edges directly at the same time to change up to four channels.
- the only exception here is that all flanks coincide with the same dimming position, but this could be integrated as an improvement after the calculation, which is played with the PWM resolution, i. that one consciously shifts the channels by 1 bit each PWM to achieve a blurring.
- This shift can then be made e.g. per period additionally change, so that the mean value over time is again stable.
- the luminous means of the first and / or at least the second luminous means arrangement can be inorganic or organic light-emitting diodes.
- the lighting means of the first and / or at least the second lighting arrangement can emit a different light spectrum.
- an operating device can be enabled in which the above-mentioned method can be performed.
- an illumination system which has at least two light sources, in which a method or operating device mentioned above is used.
- FIG. 2 schematically shows a circuit for the controlled operation of light-emitting diodes (LED), which represents an example of a driver module.
- LED light-emitting diodes
- FIG. 2 schematically shows a circuit for the controlled operation of light-emitting diodes (LED), which represents an example of a driver module.
- LED light-emitting diodes
- FIG. 2 schematically shows a circuit for the controlled operation of light-emitting diodes (LED), which represents an example of a driver module.
- LED light-emitting diodes
- the operating circuit is supplied with an input DC voltage Vm, which of course can also be a rectified AC voltage.
- Vm an input DC voltage
- a series circuit between a semiconductor power switch Sl (for example, a MOSFET) and a freewheeling diode Dl energizes in the on state of the switch Sl an inductance Ll by means of the current flowing through the switch.
- the energy stored in the coil L1 is discharged in the form of a current i through a capacitor C1 and the light-emitting diode path LED.
- control and / or regulating circuit SR which specifies the timing of the switch Sl, for example in the form of harnessfreuqenten modulated signals as a manipulated variable of the control of the LED power.
- the control and / or regulating circuit SR can, for example, apply a hysteretic current regulation.
- the control and / or regulating circuit SR detects the current through the switch Sl (in the switched state of the switch Sl).
- control and / or regulating unit SR can detect the potential on the lower-potential side of the LED path.
- Another voltage divider R3, R4 allows the detection of the supply voltage.
- the driver module is formed in this example by a buck converter, but can also be formed for example by a boost converter, buck-boost converter or other switching regulator or by a current sink or a power source.
- the switch Sl is driven internally by the control and / or regulating circuit SR with a higher frequency than the frequency, as with which the LED or the LED module are controlled.
- the internal frequency with which the switch S1 of the switching regulator is controlled may be in the range of 10 kHz to several MHz, while this internal frequency is superimposed on a low frequency which corresponds to the frequency of the at least one PWM packet.
- the LED module may be driven with a low-frequency PWM packet, which PWM packet may ripple due to the high-frequency operation of the switch S1 of the driver module during the turn-on time.
- the ripple which may result from the high-frequency operation of the switch S1 of the driver module, can be reduced by the capacitor C1.
- the low frequency of the at least one PWM packet that is superimposed may be dictated by an external controller such as a microcontroller or other central control unit.
- an external controller such as a microcontroller or other central control unit.
- the three colors of the RGB LED module can each be controlled by one driver module, the three driver modules being controlled via three PWM channels.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT7462008 | 2008-12-23 | ||
| DE102009005819A DE102009005819A1 (de) | 2008-12-23 | 2009-01-22 | Verfahren und Vorrichtung zum Betreiben von LEDs |
| PCT/EP2009/067631 WO2010081613A1 (de) | 2008-12-23 | 2009-12-21 | Verfahren und vorrichtung zum betreiben von gruppen von leds mittels pwm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2368407A1 true EP2368407A1 (de) | 2011-09-28 |
| EP2368407B1 EP2368407B1 (de) | 2014-03-19 |
Family
ID=42220959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09799347.1A Active EP2368407B1 (de) | 2008-12-23 | 2009-12-21 | Verfahren und vorrichtung zum betreiben von gruppen von leds mittels pwm |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2368407B1 (de) |
| DE (2) | DE102009005819A1 (de) |
| WO (1) | WO2010081613A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6034394A (en) | 1993-02-11 | 1994-08-29 | Louis A. Phares | Controlled lighting system |
| US6016038A (en) | 1997-08-26 | 2000-01-18 | Color Kinetics, Inc. | Multicolored LED lighting method and apparatus |
| TWI277225B (en) * | 2005-08-03 | 2007-03-21 | Beyond Innovation Tech Co Ltd | Apparatus of light source and adjustable control circuit for LEDs |
| DE102005049579A1 (de) * | 2005-10-17 | 2007-04-19 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Lichtquelle, die mischfarbiges Licht aussendet, und Verfahren zur Steuerung des Farbortes einer solchen Lichtquelle |
| US20080048582A1 (en) * | 2006-08-28 | 2008-02-28 | Robinson Shane P | Pwm method and apparatus, and light source driven thereby |
| US7948468B2 (en) * | 2007-02-23 | 2011-05-24 | The Regents Of The University Of Colorado | Systems and methods for driving multiple solid-state light sources |
-
2009
- 2009-01-22 DE DE102009005819A patent/DE102009005819A1/de not_active Withdrawn
- 2009-12-21 DE DE112009003815T patent/DE112009003815A5/de not_active Withdrawn
- 2009-12-21 WO PCT/EP2009/067631 patent/WO2010081613A1/de not_active Ceased
- 2009-12-21 EP EP09799347.1A patent/EP2368407B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010081613A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010081613A1 (de) | 2010-07-22 |
| DE112009003815A5 (de) | 2012-08-02 |
| DE102009005819A1 (de) | 2010-07-01 |
| EP2368407B1 (de) | 2014-03-19 |
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