EP2517535A1 - Schaltkreis für den betrieb von leuchtdioden (led) - Google Patents
Schaltkreis für den betrieb von leuchtdioden (led)Info
- Publication number
- EP2517535A1 EP2517535A1 EP10798097A EP10798097A EP2517535A1 EP 2517535 A1 EP2517535 A1 EP 2517535A1 EP 10798097 A EP10798097 A EP 10798097A EP 10798097 A EP10798097 A EP 10798097A EP 2517535 A1 EP2517535 A1 EP 2517535A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- choke
- current
- signal
- converter
- 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 description 9
- 230000007704 transition Effects 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 description 13
- 238000009877 rendering Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 235000012745 brilliant blue FCF Nutrition 0.000 description 1
- ONTQJDKFANPPKK-UHFFFAOYSA-L chembl3185981 Chemical compound [Na+].[Na+].CC1=CC(C)=C(S([O-])(=O)=O)C=C1N=NC1=CC(S([O-])(=O)=O)=C(C=CC=C2)C2=C1O ONTQJDKFANPPKK-UHFFFAOYSA-L 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- 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]
- H05B45/30—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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
Definitions
- the present invention relates to a circuit arrangement for operating light emitting diodes and to a method for achieving this purpose.
- Fig. 1 shows, for example, spectra of a blue 1, a green 2, a yellow 3 and a red 4 light emitting diode.
- Modules are known in which light emitting diodes of different colours, e.g. blue and yellow (two LEDs) or red, green and blue (RGB) are combined in such a way that their light is mixed, for example, by means of a diffusion screen and that the mixed light appears white or that the spectrum 5 of the light resulting therefrom extends over the whole visible range.
- the colour rendering index expresses how close the colour rendering of an artificial lighting means comes to the broadly distributed continuous spectrum of natural sunlight. As is generally known, this cannot be expressed solely by the colour temperature because the colour temperature does not indicate whether there may be gaps in the spectrum of an artificial lighting means. These spectral gaps thus arise when RGB light emitting diodes are connected to each other. However, these troughs are also found when so-called white light emitting diodes are used. These are light emitting diodes which are combined with photoluminescent material (fluorescence stain, luminescent material) . The light from the LED chip in a first spectrum is partially converted into a second spectrum by the phosphorous layer or colour conversion layer formed thereby. The mixture of the first and second spectrum then produces the spectrum of white light.
- photoluminescent material fluorescence stain, luminescent material
- Fig. 2 shows the spectrum of such a white light emitting diode.
- shortwave light such as, for example, blue light 8 can be converted into longwave light, for example, in the yellow or red wavelength range 9.
- the object of the present invention is to provide an improved control circuit and control method for operating for light emitting diodes. This object is achieved by a device and a method having the features of the independent claims.
- a first aspect of the invention relates to a driving circuit for provision of an operating current for at least one lighting means, such as e.g. a light emitting diode
- the driving circuit comprising a switched converter having a switch controlled by a control circuitry, wherein a choke is charged when the control circuitry control the switch in its conducting state and the choke is de-charged when the control circuits controls the switch in its nonconducting state, wherein by supplying an external signal or an internal feedback signal to the control circuitry, the control circuitry is designed to adapt the clocking of the switch in order to adapt the operating mode of the switched converter.
- the operating mode of the driving circuit arrangement and therefore of the switched converter can be selected out of three, so called continuos conduction mode, the so called borderline or critical conduction mode or the discontinues conduction mode, or a combination of them.
- the switched converter may be a DC/DC converter.
- the switched converter may be a buck converter, a boost converter, a fly-back converter, a buck-boost converter or a switched power factor correction circuit.
- the external signal may be at least one of a dimming signal, a color control signal and a color temperature signal .
- the feedback signal may be at least one of a power consumption signal, a lighting means current signal or a load characteristic signal representing at least one electrical parameter of the lighting means load driven by the driving circuit.
- the load characteristic signal may represent the number and/or the topology of at least two LEDs driven by the driving circuit.
- the control circuitry may be an integrated circuit such as e.g. an ASIC or a microcontroller or a hybrid thereof.
- a further aspect of the invention relates to a method for dimming at least one LED using a switched converter for supplying the at least one LED with electrical power, wherein the dimming selectively is performed via at least two dimming modes out of the three following dimming modes :
- a first dimming mode in which the at least one LED is dimmed by controlling the switch such that the current through the choke has an essentially triangular shape, wherein the dimming is achieved by adjusting the time period for allowing the choke current to rise to a peak value by switching on a switch of the switched converter, wherein the fall of the choke current, caused by switching off the switch of the switched converter at the peak, is stopped by switching on the switch of the switched converter at the latest when the falling choke current reaches a non-zero value,
- the at least one LED is dimmed by controlling the switch such that the current through the choke has an essentially triangular shape, wherein the dimming is achieved by adjusting the time period for allowing the choke current to rise to a peak value by switching on a switch of the switched converter, wherein the choke current is allowed to drop to zero and made to raise again as soon as the zero value has been reached, and
- a third dimming mode in which, in addition or alternatively to the adjustment of the time period for allowing the current to rise to a peak value, the duration of a non-zero time period between the falling choke current reaching zero and the switching-on of the switch of the switched converter in order to cause the choke current to raise again is adjusted.
- the first and second dimming mode may be selected depending on the value of a external signal or an internal feedback signal of the switched converter.
- the external signal may be at least one of a dimming signal, a color control signal and a color temperature signal .
- the feedback signal may be at least one of a power consumption signal, a lighting means current signal or a load characteristic signal representing at least one electrical parameter of the lighting means load driven by the driving circuit.
- Fig. 1 shows a further exemplified embodiment
- Fig. 2 shows signal curves for a continuous
- Fig. 3 shows signal curves for a critical
- Fig. 4 shows signal curves for a discontinuous conduction mode of a switched regulator
- Fig. 5 shows a switched power factor
- Fig. 6 shows a buck converter used as a
- Fig. 1 shows a first exemplified embodiment of a circuit arrangement 130 for controlling the light emitting diode 34 in accordance with the invention.
- the circuit arrangement 130 has a switched converter which is formed by the choke LI, the capacitor CI, the free-wheeling diode Dl, the switch SI and the light emitting diodes 34.
- the switch SI is controlled by a control circuitry, such as an IC (microcontroller, ASIC, hybrid thereof etc.) .
- the switched converter is formed as a buck converter, however, other topologies such as a boost converter (see figure 5), a flyback converter, a PFC or even a buck-boost converter can also be used.
- a plurality of resistors is provided in order to monitor the currents and voltages in the switched converter and at the light emitting diodes 34.
- the resistor Rs thus serves to monitor the current through the switch SI during the switch-on period of the switch SI, wherein the current is represented by the voltage U s across the shunt R s .
- the current i F flows through the load, i.e. the LEDs.
- the current i L flows through the choke Ll.
- the two voltage dividers R3/ R4 and Rl/ R2 serve to monitor the voltage U LED across the light emitting diodes 34.
- the light emitting diodes 34 can also be connected in series with the choke Ll.
- the switch SI of the switched converter is controlled by the control circuit IC.
- the control circuit IC can be supplied externally and/or internally with desired values which specify the time-averaged desired current through the light emitting diodes.
- internal feedback signals can be supplied to the control circuit IC from the supply voltage, the switched regulator and/or the load circuit comprising one or more LEDs.
- the control circuit IC can be supplied with a colour locus correction command as an external desired value.
- This colour locus correction command can selectively trigger the amplitude spread and possibly also specify the extent of the amplitude spread.
- the colour locus correction command therefore specifies an adaptation of the spectrum.
- the circuit arrangement 130 is an advantageous embodiment to achieve control of the light emitting diodes 34 in accordance with the invention with the smallest possible losses .
- the circuit arrangement 130 is controlled in such a way that the current i L through the choke LI never falls to zero but maintains a value which is constant on average (this is called the continuous conduction mode as the current i L is never allowed to drop to zero) .
- the choke LI is magnetised in a first phase by switching on the switch SI.
- the current i L through the choke LI can be monitored in this phase by means of the resistor Rs . certain current value (upper limit value) is achieved, the switch SI is opened.
- the current i L is now driven further through the free-wheeling diode Dl and the light emitting diodes 34.
- the current i L through the choke LI thus slowly falls.
- the capacitor CI is also charged.
- the reduction in the demagnetisation and in the current i L through the choke LI can be monitored by the two voltage dividers R3/ R4 and Rl/ R2. If the current i L reaches a certain lower limit value, the switch SI is switched on and the choke Ll is magnetised. While the free-wheeling diode Dl now blocks the current flow, the capacitor CI is discharged via the light emitting diodes 34.
- the circuit arrangement 130 is thus operated in the high-frequency range.
- the circuit arrangement 130 can also be operated in the so-called borderline (or critical mode) , in which the current is allowed to drop to zero, but caused ti raise again immediately when reaching the zero value.
- the borderline mode operation produces an operating current 100 in accordance with Figure 3.
- the choke Ll is magnetised, starting from complete demagnetisation, by closing the switch SI until the maximum value ⁇ has been achieved.
- the switch SI is now opened and the choke Ll demagnetised, which leads to a fall in the operating current.
- the time when the zero point of the operating current is achieved can be determined.
- the switch Si can be closed and the choke LI can be magnetised again.
- the circuit arrangement 130 can, for example, also be operated in an operating mode in accordance with Fig. 2.
- the choke LI is magnetised, starting from complete demagnetisation, by closing the switch SI until the maximum value ⁇ has been achieved.
- the switch SI is now opened and the choke LI is demagnetised but only until an internally set lower limit value just below the maximum value ⁇ is achieved. If this value has been achieved, the switch SI is switched on, such that a hysteresis control is achieved.
- the circuit arrangement 130 is now operated in a so-called continuous conduction mode CCM until the time duration Tnom has elapsed.
- the switch SI is permanently open and the choke LI is demagnetised, which leads to a fall in the choke current i L .
- the time when the zero point of the choke current i L is reached can be determined.
- the switch SI can be closed and the choke LI can be magnetised.
- the switch SI has two different switching frequencies, during the time duration Tnom it is controlled with a higher clock frequency in comparison to the time durations Tr, Tf and T off .
- an external signal such as, for example, a colour locus correction command
- the operating mode of the circuit arrangement 130 and therefore of the switched converter can be selected and adapted.
- Operation in the so-called continuous conduction mode, in the so-called borderline or critical mode, the discontinuous mode (in which the current remains at zero fpr a time period larger than zero) or even a combination of the three operating modes can be selected for example. This aspect of the invention will be further explained later on with reference to figures 14 to 18.
- a switched converter (buck converter, boost converter, PFC converter, flyback converter, etc.) selectively operates in at least two different operation modes, which different operation modes e.g. can be different dimming modes.
- the at least two different operation modes can be selected e.g. from:
- the different dimming modes can e.g. be used to have a first dimming range up to a defined threshold value, and a second dimming range in which the switch converter is in a different operation mode than in the first dimming range.
- a third dimming range can be provided in which the switch converter is operated in a third operation mode (which is different both to the first and second operation mode) .
- Figure 2 shows different signal curves when a switched converter is operated in the so-called continuous conduction mode CCM.
- the current through the load (LEDs) is not exactly following the choke current i L , as the storage capacitor CI has a filtering effect.
- the power supplied to the LED load is a function of the time average value of the choke current. Obviously, by increasing the time period t 0ff during which the switch is in the non-conducting state, the average value of the choke current i L can be reduced, leading to a downwards dimming (reduced power) of the LED load.
- Figure 3 shows the so-called borderline or critical conduction mode, in which the non-conducting period of the switch SI, the time period t 0ff as well as the switching-on time period t on have been increased such that the current i L is allowed to drop to zero during the non-conducting time period t off , the switch SI is switched on (put in the conducting state) by the control circuitry as soon as it has reached the zero value.
- FIG 4 now illustrates the already mentioned third operation mode for a switch converter, the so-called discontinuous conduction mode.
- the choke current i L is again be allowed to drop to zero.
- the switch SI is not immediately switched on upon the choke current i L reaching the zero value.
- the non conducting time period t 0ff is extended such that there is a non zero time period during which the choke current I L remains at zero.
- a dimming can be achieved e.g. by increasing the t off value and thus the time period in which the choke current i L is zero.
- Figure 5 shows an actively switched power factor correction circuit PFC, which according to the invention can selectively operate in a least two different modes, when assessed by the respective waveform of the choke current i L .
- the power circuitry is depicted as a micro controller ⁇ , although e.g. also an ASIC or a hybrid version of a microcontroller and an ASIC can be used.
- Internal feedback signals from the switched controller can be fed back to the control circuitry.
- Typical examples are the sensed input voltage of the switched converter, a zero crossing detection signal for detecting the zero crossing of the choke current i L , a signal indicating the current through the switch SI and furthermore, feedback signals from the load such as e.g. the lighting means (LED) voltage, the lighting means (LED) current and the load characteristics, i.e. a signal indicating e.g. the number and the topology of several connected LEDs driven as a load.
- the load e.g. the lighting means (LED) voltage, the lighting means (LED) current and the load characteristics, i.e. a signal indicating e.g. the number and the topology of several connected LEDs driven as a load.
- control circuitry as shown in figures 5 or 6 for a switched lighting means converter can operate selectively in different operation modes, i.e. the continuous conduction mode of figure 24, the borderline (critical) conduction mode of figure 3 or the discontinuous conduction mode of figure 4.
- the control circuitry will select the best-suited operation mode according to any of the internal and/or external feedback signals, examples of which are given above .
- Figure 6 shows a buck converter used as a current source of one or more LEDs driven as a load.
- different internal feedback signals e.g. input or supply voltage, zero crossing detection, switch current, load characteristic, power consumption representing parameters
- external signals e.g. external dimming control signals
- An advantage is that without changing the dimensions of the hardware elements, such as for example the choke LI and the storage capacitor CI, varying loads, such as for example different topologies or different numbers of driven LEDs can be operated by the switched conducting means converter, all by having reasonable switching times and freguencies for the choke current i L and thus the LED current i F .
- a choke LI with a maximum allowed current of 0.55 A can be used in the continuous conduction mode (CCM) for a LED current i F up to 500 mA (average value) , wherein the t on -time period duration for the switch SI primarily depends on the amplitude (RMS value) of the supply voltage V in and the voltage across the LEDs UL E D- If it is desired (indicated e.g. via an external or internal dimming command) to reduce the average value of the LED current i F , obviously the t on -time period has to be reduced, especially when also U LE D is small. This reduction of Ton-time period for the switch SI will thus lead to very high switching frequencies.
- the choke current i L will eventually be allowed to drop to zero, which corresponds to a dimming of the LEDs, in which the LED current i F time average basis is only 50% of the allowed maximum LED current i F .
- the dimming value of 50% leads to a change of the previous continuous conduction mode to the borderline mode .
- the switched converter will change from the borderline conduction mode to the discontinuous conduction mode depicted in figure 4.
- the t 0ff time period will be further increased in order to further reduce the average LED current i F all by having a t on time period is not too small, i.e. below a certain lower threshold value representing the minimum value possible e.g. with the clocking of the control circuitry.
- control circuitry will use an operation mode for the switched lighting means converter depending on the load, the current requirements of the load etc. in order to have a flexible use of the same hardware for different scenarios and for a wide dimming range.
- the switched converter may be a switched PFC, which generates, as a first converter stage of at least two converter stages, a DC voltage typically out of a rectified AC voltage, such as e.g. mains voltage.
- a DC/DC or DC/AC (e.g. half bridge or full bridge converter) stage supplying the lighting means and optionally also selectively operating in different operation modes, depending on external signal and/or internal feedback signal.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10798097.1A EP2517535B1 (de) | 2009-12-23 | 2010-12-22 | Schaltkreis zum Betreiben von Leuchtdioden (LED) |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09180513 | 2009-12-23 | ||
EP10151196A EP2341760A1 (de) | 2009-12-23 | 2010-01-20 | Schaltkreis zum Betreiben von Leuchtdioden (LED) |
PCT/EP2010/070587 WO2011076898A1 (en) | 2009-12-23 | 2010-12-22 | CIRCUIT FOR OPERATING LIGHT EMITTING DIODES (LEDs) |
EP10798097.1A EP2517535B1 (de) | 2009-12-23 | 2010-12-22 | Schaltkreis zum Betreiben von Leuchtdioden (LED) |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2517535A1 true EP2517535A1 (de) | 2012-10-31 |
EP2517535B1 EP2517535B1 (de) | 2017-05-24 |
Family
ID=41716285
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10151196A Withdrawn EP2341760A1 (de) | 2009-12-23 | 2010-01-20 | Schaltkreis zum Betreiben von Leuchtdioden (LED) |
EP10798097.1A Active EP2517535B1 (de) | 2009-12-23 | 2010-12-22 | Schaltkreis zum Betreiben von Leuchtdioden (LED) |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10151196A Withdrawn EP2341760A1 (de) | 2009-12-23 | 2010-01-20 | Schaltkreis zum Betreiben von Leuchtdioden (LED) |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP2341760A1 (de) |
CN (1) | CN102812779B (de) |
DE (1) | DE112010004983B4 (de) |
WO (1) | WO2011076898A1 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5828106B2 (ja) * | 2011-04-13 | 2015-12-02 | パナソニックIpマネジメント株式会社 | 固体光源点灯装置およびそれを用いた照明器具 |
DE102011088966A1 (de) * | 2011-12-19 | 2013-06-20 | Tridonic Gmbh & Co. Kg | Betriebsschaltung für Leuchtdioden und Verfahren zum Betrieb von Leuchtdioden |
CN103200727A (zh) * | 2012-01-06 | 2013-07-10 | 欧司朗股份有限公司 | Led驱动电路和包括该led驱动电路的照明装置 |
JP5988207B2 (ja) * | 2012-09-07 | 2016-09-07 | パナソニックIpマネジメント株式会社 | 固体発光素子駆動装置及び照明装置、照明器具 |
DE102013205859B4 (de) * | 2013-04-03 | 2021-12-09 | Tridonic Gmbh & Co Kg | Verfahren und Betriebsschaltung zum Betrieb von Leuchtmitteln, insbesondere Leuchtdioden (LEDs) |
AT14074U1 (de) * | 2013-04-30 | 2015-04-15 | Tridonic Gmbh & Co Kg | Betriebsschaltung für LED |
JP6037284B2 (ja) | 2013-05-28 | 2016-12-07 | パナソニックIpマネジメント株式会社 | 点灯装置及びそれを用いた照明器具、照明システム |
DE102014205843A1 (de) | 2014-03-28 | 2015-10-01 | Tridonic Gmbh & Co Kg | Berührungssicheres Betriebsgerät für Leuchtmittel mit PWM-modulierter Ausgangsspannung |
DE102014221024A1 (de) * | 2014-10-16 | 2016-04-21 | Tridonic Gmbh & Co Kg | Betriebsschaltung für Leuchtmittel mit PFC-Steuereinheit |
DE102014221511A1 (de) * | 2014-10-23 | 2016-04-28 | Tridonic Gmbh & Co Kg | PFC-Schaltung mit spannungsabhängiger Signalzuführung |
CN104619092B (zh) * | 2015-02-12 | 2017-03-29 | 辉芒微电子(深圳)有限公司 | 一种led驱动电路 |
AT16867U1 (de) * | 2015-02-24 | 2020-11-15 | Tridonic Gmbh & Co Kg | Abwärtswandler zum Betreiben von Leuchtmitteln mit Spitzenstromwertsteuerung und Mittelstromwerterfassung |
DE102015223723A1 (de) * | 2015-11-30 | 2017-06-01 | Tridonic Gmbh & Co Kg | Schaltregler zum Betreiben von Leuchtmitteln mit Spitzenstromwertsteuerung und Mittelstromwerterfassung |
DE102015210710A1 (de) * | 2015-06-11 | 2016-12-15 | Tridonic Gmbh & Co Kg | Getaktete Sperrwandlerschaltung |
DE102018204891A1 (de) * | 2017-09-13 | 2019-03-14 | Tridonic Gmbh & Co Kg | Betriebsgerät für eine elektrische Last und Verfahren |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2843191B2 (ja) * | 1992-01-30 | 1999-01-06 | 富士通株式会社 | 電子デバイスの駆動回路 |
US6577512B2 (en) * | 2001-05-25 | 2003-06-10 | Koninklijke Philips Electronics N.V. | Power supply for LEDs |
US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
WO2007141741A1 (en) * | 2006-06-08 | 2007-12-13 | Koninklijke Philips Electronics N.V. | Circuitry for dimming led illumination devices |
DE602006014124D1 (de) * | 2006-06-22 | 2010-06-17 | Osram Gmbh | LED-Ansteuereinrichtung |
US7902771B2 (en) * | 2006-11-21 | 2011-03-08 | Exclara, Inc. | Time division modulation with average current regulation for independent control of arrays of light emitting diodes |
US7944153B2 (en) * | 2006-12-15 | 2011-05-17 | Intersil Americas Inc. | Constant current light emitting diode (LED) driver circuit and method |
-
2010
- 2010-01-20 EP EP10151196A patent/EP2341760A1/de not_active Withdrawn
- 2010-12-22 WO PCT/EP2010/070587 patent/WO2011076898A1/en active Application Filing
- 2010-12-22 CN CN201080058870.4A patent/CN102812779B/zh active Active
- 2010-12-22 EP EP10798097.1A patent/EP2517535B1/de active Active
- 2010-12-22 DE DE112010004983.1T patent/DE112010004983B4/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011076898A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102812779B (zh) | 2016-05-25 |
CN102812779A (zh) | 2012-12-05 |
EP2517535B1 (de) | 2017-05-24 |
DE112010004983T5 (de) | 2013-01-24 |
EP2341760A1 (de) | 2011-07-06 |
DE112010004983B4 (de) | 2024-04-18 |
WO2011076898A1 (en) | 2011-06-30 |
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