EP1843640A1 - LED-Modul und LED Beleuchtungsystem - Google Patents

LED-Modul und LED Beleuchtungsystem Download PDF

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Publication number
EP1843640A1
EP1843640A1 EP06112272A EP06112272A EP1843640A1 EP 1843640 A1 EP1843640 A1 EP 1843640A1 EP 06112272 A EP06112272 A EP 06112272A EP 06112272 A EP06112272 A EP 06112272A EP 1843640 A1 EP1843640 A1 EP 1843640A1
Authority
EP
European Patent Office
Prior art keywords
controller
led
led module
current
leds
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.)
Withdrawn
Application number
EP06112272A
Other languages
English (en)
French (fr)
Inventor
Juan Sanchez Navarro
Víctor Navarro Gea
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Semai Lighting S L
Original Assignee
Semai Lighting S L
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 Semai Lighting S L filed Critical Semai Lighting S L
Priority to EP06112272A priority Critical patent/EP1843640A1/de
Publication of EP1843640A1 publication Critical patent/EP1843640A1/de
Withdrawn legal-status Critical Current

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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]
    • H05B45/10—Controlling the intensity 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]

Definitions

  • This invention relates to a Led module which comprises at least one Led, and it also relates to a Led based lightning system which may comprise a first controller external to the Led module.
  • the Led module may comprise a plurality of Leds.
  • Each first controller is part of a control system and contributes to regulate the current delivered to the Leds, with the aim of controlling the luminosity of the Leds as a function of time.
  • a Led Light Emitting Diode
  • a Led is essentially a PN junction semiconductor diode that emits a monochromatic light when operated in a forward biased direction.
  • Leds could only achieve a very limited number of light wavelengths (colors) but, as Led technology evolved through the 1970's, additional colors became available. This helped to extend their use to a wider range of devices, but they were still used mainly as indicators and not for general lighting purposes.
  • Led bulbs or Led fixtures formed by several grouped Leds
  • Led bulbs or Led fixtures have come to be used more widely in more situations, often replacing conventional bulbs in space-illumination applications, and not just in low-power instrumentation or indication appliances. This circumstance has brought the need of developing control systems for groups of Leds which are arranged separately from each other.
  • the input (current), and hence the output (light), of a Led-based lighting system admit much more possibilities of electronic control than the same in a conventional lighting system, because of the rapid response of Leds to current supply variation. This allows energy-saving and color and luminosity variation.
  • Leds are available in a variety of colors, mainly red, green, blue, amber and white.
  • a plurality of diversely coloured Leds may be combined in a lighting fixture and the intensity of the Leds of each color may be independently varied to produce different hues.
  • control means are suitable to control only a limited number of Leds.
  • a commercially available known Led-based lightning control system integrates in the same apparatus (fig. 1) a DMX protocol controller provided with an input data line, a power supply source and three current supply sources designed to support at most 10 Leds connected to each of them. Said connections are arranged in a way such that the Leds are connected in a serial mode and the ground cable returns to the correspondent current supply source. Instructions related to the luminosity of the Leds are transmitted to the controller through its input data line.
  • this apparatus allows the control of a definite number of Leds; if, for example, there is one more Led in the lightning system, then another of said apparatuses has to be added and the new Led has to be connected to it. This is cumbersome as well as expensive.
  • one Led module comprises an internal current controller which regulates the current supplied to the Led, so that said controller sets the intervals of time in which the Led is conducting current. Consequently, the Leds of a Led module have an autonomous current control, though perhaps linked to an external control.
  • the internal controller comprises a data input pin through which it can receive a modulation signal, in order to modulate the current delivered to the Led.
  • the modulation signal may advantageously be a Pulse Width Modulation carrier, the amplitude of which may determine whether the controller allows the passage of current through the Led.
  • one Led-based lighting system comprises at least one Led module having the above features. It may also comprise a first controller and a data connection between the first controller and the Led module. In this case, the Led module controller is called a second controller.
  • one first controller can cooperate with several second controllers to jointly set the luminosity of the Leds. In order to do so, said data connection reaches the Led module through its second controller.
  • each Led module can receive a specific set of instructions.
  • the lightning system comprises a control device prepared to send to each first controller instructions related to the desired amount of brightness of each Led as a function of time. Then, the first controller, in response to the instructions received from the control device, generates and transmits a modulation signal, e.g. a PWM carrier, to the second controllers.
  • a modulation signal e.g. a PWM carrier
  • the lightning system also comprises a power supply source, to the terminals of which each Led module is connected in parallel. As a consequence, there is no need to provide, after the last Led module of a string, for a return cable to the power supply source.
  • a particular embodiment of a Led-based lightning system comprises (fig. 2) a control device 6, a power supply source 2, several (although it might be one) first controllers 3 and several (although it might be one) Led modules 1 connected to each first controller 3.
  • the control device 6 may be any device capable of sending instructions to lightning luminaires, such as a switch or group of switches, a mix board, a computer, etc.
  • the first controller 3 has a current connection to the power supply source 2, a data connection to the control device 6, and a data connection to each Led module associated with it.
  • Each Led module 1 comprises at least one Led 4 and one second cotroller 5, which acts essentially as a current supply source and is connected to one corresponding first controller 3, so that the second controllers 5 and their corresponding first controller 3 cooperate to, according to the instructions received from the control device 6, control the luminosity produced by the Leds 4.
  • Said luminosity depends on the amount of current that go through each Led 4 in a certain period of time. Since in order to work properly the Leds must conduct a current of a fixed nominal intensity, it follows that for varying its luminosity it is convenient for them to stop conducting current during an interval of said period.
  • Each Led module 1 is connected in parallel to the terminals of the power supply source 2. Both this current connection and the data connection of each module 1 with its corresponding first controller 3 go through the second controller 5.
  • Each second controller 5 comprises an electronic device for regulating the amount of current delivered to the Leds 4 of its module 1.
  • connection between one first controller 3 and the Led modules 1 may comprise several lines, one for each group of Leds 4 related by a certain feature that may be desired to control independently (for example Leds of the same color, the same temperature of white, the same position, etc).
  • control device 6 employs a DMX protocol for addressing each first controller 3 connected to it, but it might employ any other suitable standard data transmission protocol.
  • the control device 6 issues a set of instructions for controlling the Leds 4 and for controlling, when appropiate, each group of Leds independently. Said instructions specify which Leds have to emit light, when and with which luminosity. Furthermore, it packages said set of instructions with said data transmission protocol, with the aim of adressing a specific first controller 3 and correctly transmitting the data to its correponding second controllers 5.
  • each first controller accepts only the instructions addressed to it.
  • a specific first controller interprets and retransmits it to each second controller 5 associated, in the form of a modulation signal with a variable pulse length which sets the time during which the corresponding Leds 4 are active.
  • a preferred modulation signal is a PWM (Pulse Width Modulation) carrier which in this case is an ON/OFF signal that allows the free passage of current during a portion of its period and stops it during the rest of the period.
  • PWM Pulse Width Modulation
  • This proportion of ON/OFF determines the level of luminosity produced by the Leds (figure 3).
  • the supplied voltage and current intensity are fixed but, by virtue of the PWM carrier, the power delivered to the Leds is a portion of the maximum power.
  • the pulse width, and hence the power delivered to the Leds, of the PWM carrier is determined by the instructions sent by the control device 6. Said PWM carrier is generated by the first controller 3.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP06112272A 2006-04-05 2006-04-05 LED-Modul und LED Beleuchtungsystem Withdrawn EP1843640A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06112272A EP1843640A1 (de) 2006-04-05 2006-04-05 LED-Modul und LED Beleuchtungsystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06112272A EP1843640A1 (de) 2006-04-05 2006-04-05 LED-Modul und LED Beleuchtungsystem

Publications (1)

Publication Number Publication Date
EP1843640A1 true EP1843640A1 (de) 2007-10-10

Family

ID=36790823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06112272A Withdrawn EP1843640A1 (de) 2006-04-05 2006-04-05 LED-Modul und LED Beleuchtungsystem

Country Status (1)

Country Link
EP (1) EP1843640A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020070688A1 (en) * 1997-08-26 2002-06-13 Dowling Kevin J. Light-emitting diode based products
US6806659B1 (en) * 1997-08-26 2004-10-19 Color Kinetics, Incorporated Multicolored LED lighting method and apparatus
EP1482770A1 (de) * 2002-03-01 2004-12-01 Sharp Kabushiki Kaisha Lichtemissionsbauelement und anzeigeeinheit mit dem lichtemissionsbauelement und leseeinrichtung
US20050041424A1 (en) * 1999-11-18 2005-02-24 Color Kinetics, Inc. Systems and methods for converting illumination
US20050225976A1 (en) * 2004-04-08 2005-10-13 Integrated Illumination Systems, Inc. Marine LED lighting network and driver
US20060043911A1 (en) * 2004-08-31 2006-03-02 Jianwen Shao Method and circuit for driving a low voltage light emitting diode
WO2006030191A1 (en) * 2004-09-17 2006-03-23 Lumidrives Limited Light emitting diode (led) control

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020070688A1 (en) * 1997-08-26 2002-06-13 Dowling Kevin J. Light-emitting diode based products
US6806659B1 (en) * 1997-08-26 2004-10-19 Color Kinetics, Incorporated Multicolored LED lighting method and apparatus
US20050041424A1 (en) * 1999-11-18 2005-02-24 Color Kinetics, Inc. Systems and methods for converting illumination
EP1482770A1 (de) * 2002-03-01 2004-12-01 Sharp Kabushiki Kaisha Lichtemissionsbauelement und anzeigeeinheit mit dem lichtemissionsbauelement und leseeinrichtung
US20050225976A1 (en) * 2004-04-08 2005-10-13 Integrated Illumination Systems, Inc. Marine LED lighting network and driver
US20060043911A1 (en) * 2004-08-31 2006-03-02 Jianwen Shao Method and circuit for driving a low voltage light emitting diode
WO2006030191A1 (en) * 2004-09-17 2006-03-23 Lumidrives Limited Light emitting diode (led) control

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