WO2009092443A1 - Procédé et circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices - Google Patents

Procédé et circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices Download PDF

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Publication number
WO2009092443A1
WO2009092443A1 PCT/EP2008/050796 EP2008050796W WO2009092443A1 WO 2009092443 A1 WO2009092443 A1 WO 2009092443A1 EP 2008050796 W EP2008050796 W EP 2008050796W WO 2009092443 A1 WO2009092443 A1 WO 2009092443A1
Authority
WO
WIPO (PCT)
Prior art keywords
semiconductor light
voltage
light sources
control
switching regulator
Prior art date
Application number
PCT/EP2008/050796
Other languages
German (de)
English (en)
Inventor
Frederik Hempelmann
Ralf Hying
Peter Niedermeier
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Priority to PCT/EP2008/050796 priority Critical patent/WO2009092443A1/fr
Priority to TW098101768A priority patent/TW200937999A/zh
Publication of WO2009092443A1 publication Critical patent/WO2009092443A1/fr

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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
    • 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
    • H05B45/395—Linear regulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to a two-stage control method for semiconductor light sources, which is suitable for ge applications that require a very fast control of Halb ⁇ leiterloismaschinen. This is the case, for example, with projection devices equipped with semiconductor light sources. In particular, microdisplay applications for front and rear projection should be mentioned.
  • Powerful semiconductor light sources such as high-performance light-emitting diodes ⁇ lately are increasingly used in applications that were previously reserved for high-pressure discharge lamps. Especially in the projection area, the semiconductor light sources are not driven continuously, but operated pulsed to meet the local requirements. It works with very short Pul ⁇ sen, which have a very high power density for it.
  • the control circuit is divided into a video electronics, working up the etcssig ⁇ nal, and a driver electronics that controls the far ⁇ -lived semiconductor light sources.
  • a driver electronics that controls the far ⁇ -lived semiconductor light sources.
  • fast line speeds are used to control the semiconductor light sources. arregler used. So that the linear regulator must not produce übermä ⁇ ssige power loss and dissipate them is preceded by a switching regulator that controls down sources of the higher supply voltage to the voltage of the semiconductor light.
  • the upstream switching regulator is regulated to a voltage which corresponds at least to the highest forward voltage of the semiconductor light sources.
  • the output voltage is determined by a STEU ⁇ ersignal the switching regulator. This is preferably done in such a way that it adjusts the output voltage to a voltage that depends on the forward voltage of at least one semiconductor light source branch. While in the prior art, the switching regulator is not driven and therefore, in order to ensure safe operation of the semiconductor light sources, provides a high enough in each case and therefore selected too high out ⁇ output voltage, the switching regulator by his knowledge of the Flusstapen the semiconductor light source branches, which are in particular also time-varying, each currently an output voltage value festle ⁇ conditions, in which the lowest possible power loss occurs in the linear controllers.
  • the output voltage is set to a voltage which is dependent on the forward voltage of that Halbleiterlicht provokenastes in which the forward voltage is the largest (when compared to the other in the semiconductor light source branches).
  • the voltage should be slightly higher, namely between 0.1 and 10% and preferably between 1 and 5%, for example between 0.03 and 0.05 V per LED in a semiconductor light source ⁇ nast, be higher than the forward voltage of that semiconductor light source branch in where the forward voltage is the largest.
  • the output voltage of the switching regulator is, if possible, already adjusted to the next semiconductor light sources to be operated while the current semiconductor light sources are still being operated. Of course, this is only possible if the forward voltage of the next semiconductor light sources to be operated is higher than the forward voltage of the semiconductor light sources currently being operated.
  • Fig. 2 Schematic representation of a Wegungsanord ⁇ tion according to the prior art with a switching regulator 3.1, the output voltage is set to a voltage corresponding to the maximum possible forward voltage to be operated semiconductor light sources (5.1 .. 5.n).
  • Fig. 4 waveforms representing the delay between the control input and the LED current 90.
  • the input signal 70 is delayed by a Sig ⁇ nal umanscrien passed on to the semiconductor light sources in order to give the switching regier time to adjust the output voltage 80th
  • Fig. 5 waveforms according to a preferred embodiment with three different colored LEDs.
  • a switching controller 3.1 receives an input voltage U 1n and converts it to an output voltage Uout. This voltage serves as input voltage for several linear regulators 4.1 .. 4.n, in turn, connected to them light-emitting diodes 5.1 .. 5.n operate with a forward voltage U f i .. U fn .
  • a forward voltage U f i .. U fn U f i .. U fn .
  • more than one light-emitting diode can be connected to a linear regulator. Due to the operation of the light-emitting diode ⁇ are driven substantially in succession. But it can also happen that an LED color with egg ⁇ nem small portion of another light emitting color is saturated ent ⁇ .
  • the controller 61 processes the output from the video electronics signal 70 and outputs it to the controller near Li ⁇ 4.1 ... 4.n control signals 7.1 ... 7.n which drive these substantially sequentially.
  • the controller outputs a signal to the switching regulator 3.1, which always adjusts its output voltage to a voltage slightly above the forward voltage of the currently operating LEDs. If several LEDs are operated, the output voltage is set to a voltage slightly above the LEDs with the higher forward voltage.
  • the switching regulator is adjusted in its output voltage as closely as possible to the optimum input voltage of the linear regulator to be used.
  • a signal store is implemented in the controller which delays the input signal 70 of the video electronics 65 in order to give the switching regulator sufficient time to adapt its output voltage to the required values.
  • the waveforms are shown in Fig. 4 is provided ⁇ .
  • the minimum delay time results from the minimum rise time t rise from the minimum required output voltage to the maximum required output voltage 80 of the switching regulator. This is necessary at the Switching on the corresponding LEDs always to be able to provide the full forward voltage.
  • Fig. 5 shows the waveform of a preferred embodiment with three different colored LEDs.
  • the image is composed of pixels similar to a television tube, the color of which is composed by means of an additive color mixture of the colors red, green and blue.
  • the input signal contains 70 ent ⁇ speaking color components 7.1, 7.2 and 7.3 for red, green and blue.
  • This signal is ver ⁇ works by the control circuit 61 and this is then by the time t rise delays the signals 7.1 ... 7.3 to the corresponding linear controller.
  • the signal 80 represents the output voltage of the switching regulator, the signals 91, 92 and 93 are the current waveforms of the red, green and blue LEDs.
  • the output voltage 80 of the Wegreg ⁇ lers is adapted to the forward voltage of the red LED before it is turned on (signal 91).
  • the switching regulator starts setting the voltage to the new value.
  • time ti ie at time t rise later, this has happened and the red LED is turned on.
  • the output voltage of the switching regulator 3.1 is already increased again at time t 2 , since the green LED has a higher forward voltage. This happens at the time the signal 72, the green LED switching signal, goes to logic 1.
  • the time interval between t 2 and the switch-on time of the green LED t 4 is also t rise .
  • the red LED is switched off.
  • the green LED is a short gap to separate the colors cleanly from each other, and high current peaks that would be caused by overlapping operation of two LEDs to be avoided.
  • signal 73 for the blue LED is switched to logic 1 at time t 5 .
  • the output voltage 80 of the switching regulator 3.1 is maintained once at time t 5 .
  • the green LED is turned off, starting, the output ⁇ off voltage 80 down to the forward voltage of the blue LED.
  • the blue LED is turned on.
  • the red LED with a low current is also switched on again. Both LEDs remain in operation until time ts. Since the blue LED forward voltage higher ⁇ be located than the red LED, the output voltage of the switching regulator is set to 3.1, a voltage ge ⁇ is slightly higher than the forward voltage of the blue LED. This means that the linear regulator of the red LED has to compensate for a higher input voltage. However, this is not a problem due to the low LED current of the red LED in desaturation mode. In order to be able to adapt the output voltage 80 of the switching regulator to the forward voltages of the diodes, the forward voltages of the connected diodes must be stored in the control circuit 61.
  • the forward voltage of the LEDs during operation is measured and input to the controller 61, as indicated by dashed lines 62 in FIG.
  • the output voltage 80 of the switching regulator can always be optimally adapted to the diodes to be operated without the flux voltages of the connected diodes having to be stored in the control unit.
  • the controller 61 sets by their control signals, which sends them to the linear ⁇ controller 4.1 .. 4.9, the respective current strength of the light emitting diodes 5.1 .. 5.n flowing current. It can now at least be calibrated once a characteristic of the flow ⁇ voltage of the LEDs in dependence on this current strength (defined by control signals).
  • a reference current value is already set by the controller 61 anyway.
  • the intensity of the said current by the diode at ⁇ value emitted light is measured.
  • the reference current value is changed from frame to frame, so that after passing through a certain number of frames a characteristic of the emitted light intensity is obtained at the current setpoint.
  • the flux voltage at the respective LED can be measured simultaneously with the light intensity by the sensor, so that in addition to the intensity-current characteristic curve, a flux voltage current intensity characteristic curve is available after a predetermined time.
  • the STEU ⁇ augmentation 61 Due to the characteristic of the STEU ⁇ augmentation 61 has then always have information about the actual flow voltage and thus can precisely adjust the output voltage of the switching regulator 3.1 to such a voltage, a ⁇ which is slightly higher than said flow voltage, due to the precise knowledge of the forward voltage can be precisely determined to what extent the adjusted voltage should be higher than the forward voltage of the LED. It is advisable to increase the forward voltage of at least 0.1% and at most 10% in relation to the refreshes ⁇ economic forward voltage.
  • the lower limit should be chosen so that an emission of light by the respective LED even with variations in the voltage (if necessary due to voltages of the current) ge ⁇ is ensured.
  • the upper limit is due to the power loss to be accepted.
  • the range mentioned can be further restricted to a range of 1 to 5%.
  • the voltage is set by the switching regulator to a voltage 3.1 namely, that of the maximum voltage of that flow from Halbleiterlicht provokenastes ⁇ pending, in which said maximum forward voltage is the largest.
  • a voltage 3.1 namely, that of the maximum voltage of that flow from Halbleiterlicht provokenastes ⁇ pending, in which said maximum forward voltage is the largest.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

L'invention concerne un procédé pour réguler en deux étapes des sources lumineuses semi-conductrices avec un circuit électrique comprenant : un régulateur de commutation (3.1), qui convertit une tension d'entrée (Uin) en une tension de sortie (80) qui est introduite dans plusieurs régulateurs linéaires (4.1... 4.n) auxquels sont respectivement raccordées une ou plusieurs sources lumineuses semi-conductrices (5.1... 5.n) d’un groupe de sources lumineuses semi-conductrices; et un circuit de commande (61) qui commande le régulateur de commutation (3.1) et les régulateurs linéaires (4.1... 4.n), le circuit de commande commandant le régulateur de commutation (3.1) de telle sorte qu'il règle sa tension de sortie à une tension légèrement supérieure à la tension de flux des groupes de sources lumineuses semi-conductrices, par exemple du groupe de sources lumineuses semi-conductrices dans lequel elle est maximale, ou encore du groupe de sources lumineuses semi-conductrices qu’il s’agit précisément de faire fonctionner. Le régulateur de commutation (3.1) délivre des signaux de commande qui définissent l’intensité du courant, laquelle est en relation directe avec la tension de flux. Une courbe caractéristique de la tension de flux peut être utilisée en fonction de ces signaux de commande. L'invention concerne également un circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices, qui est régulé avec un procédé d’exploitation selon l’invention.
PCT/EP2008/050796 2008-01-24 2008-01-24 Procédé et circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices WO2009092443A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2008/050796 WO2009092443A1 (fr) 2008-01-24 2008-01-24 Procédé et circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices
TW098101768A TW200937999A (en) 2008-01-24 2009-01-17 Procedure and switching configuration for the two-stage regulation of semiconductor sources of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/050796 WO2009092443A1 (fr) 2008-01-24 2008-01-24 Procédé et circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices

Publications (1)

Publication Number Publication Date
WO2009092443A1 true WO2009092443A1 (fr) 2009-07-30

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Application Number Title Priority Date Filing Date
PCT/EP2008/050796 WO2009092443A1 (fr) 2008-01-24 2008-01-24 Procédé et circuit électrique pour réguler en deux étapes des sources lumineuses semi-conductrices

Country Status (2)

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TW (1) TW200937999A (fr)
WO (1) WO2009092443A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040051382A1 (en) * 2002-09-12 2004-03-18 Gavrila Gabe C. Method and circuits for inductive DC converters with current regulated output
US20040233144A1 (en) * 2003-05-09 2004-11-25 Rader William E. Method and apparatus for driving leds
WO2006080365A1 (fr) * 2005-01-25 2006-08-03 Rohm Co., Ltd Appareil d’alimentation, appareil d’émission de lumière et appareil d’affichage
WO2006107199A2 (fr) * 2005-04-08 2006-10-12 Wart Hog Ii Holding B.V. Procedes et appareils d'exploitation de groupes de del a haute puissance
WO2007068096A1 (fr) * 2005-12-16 2007-06-21 Dellux Technologies, Inc. Ensemble circuits electriques a diodes electroluminescentes
US20070194210A1 (en) * 2006-02-21 2007-08-23 Samsung Electronics Co., Ltd. Light emitting apparatus and control method thereof
WO2007141732A2 (fr) * 2006-06-09 2007-12-13 Koninklijke Philips Electronics N.V. Panneau lumineux del pour lcd avec recalibrage de l'uniformité des couleurs sur la durée de vie

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040051382A1 (en) * 2002-09-12 2004-03-18 Gavrila Gabe C. Method and circuits for inductive DC converters with current regulated output
US20040233144A1 (en) * 2003-05-09 2004-11-25 Rader William E. Method and apparatus for driving leds
WO2006080365A1 (fr) * 2005-01-25 2006-08-03 Rohm Co., Ltd Appareil d’alimentation, appareil d’émission de lumière et appareil d’affichage
WO2006107199A2 (fr) * 2005-04-08 2006-10-12 Wart Hog Ii Holding B.V. Procedes et appareils d'exploitation de groupes de del a haute puissance
WO2007068096A1 (fr) * 2005-12-16 2007-06-21 Dellux Technologies, Inc. Ensemble circuits electriques a diodes electroluminescentes
US20070194210A1 (en) * 2006-02-21 2007-08-23 Samsung Electronics Co., Ltd. Light emitting apparatus and control method thereof
WO2007141732A2 (fr) * 2006-06-09 2007-12-13 Koninklijke Philips Electronics N.V. Panneau lumineux del pour lcd avec recalibrage de l'uniformité des couleurs sur la durée de vie

Also Published As

Publication number Publication date
TW200937999A (en) 2009-09-01

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