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WO2010091619A1 - Procédé d'identification automatique du courant dans des led d'éclairage - Google Patents

Procédé d'identification automatique du courant dans des led d'éclairage Download PDF

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Publication number
WO2010091619A1
WO2010091619A1 PCT/CN2010/070465 CN2010070465W WO2010091619A1 WO 2010091619 A1 WO2010091619 A1 WO 2010091619A1 CN 2010070465 W CN2010070465 W CN 2010070465W WO 2010091619 A1 WO2010091619 A1 WO 2010091619A1
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WO
WIPO (PCT)
Prior art keywords
current
branch
identification
led
resistor
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PCT/CN2010/070465
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English (en)
Chinese (zh)
Inventor
黄华南
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Individual
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Individual
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    • 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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the present invention relates to the field of LED driving, and in particular to a current identification method for a LED.
  • Light-emitting diodes have been widely used in inventions for more than 40 years. Since LEDs have been mainly used for display purposes, power utilization efficiency is relatively minor, and sometimes even considered as an unconsidered factor.
  • Diode drive current control is generally very simple, such as the general product only uses a fixed voltage source for power supply and serial resistor current limit, and some low-end applications do not even add any current limiting measures, only use the power supply or control device internal resistance to reach the limit
  • the purpose of this type of circuit design is undoubtedly sufficient in daily low-power, low-cost applications, but it is still unsatisfactory in terms of power efficiency, reliability and stability.
  • LEDs have been greatly improved in brightness performance. Because LEDs are solid-state devices, they have high mechanical strength and small size, which is conducive to efficient optical design. The damage mechanism is slow and can provide Over 100,000 hours of service life, free of harmful heavy metal mercury, has recently become a very attractive source of lighting.
  • the change in the amount of light source load only affects the load current at a fixed supply voltage, and the power supply voltage does not need to be adjusted according to the amount of light source load.
  • the power supply requirement of the LED is a DC current source, which is not directly compatible with the general DC power supply. The reason is that the equivalent circuit of the LED is a diode voltage drop plus a series connected dynamic resistor. The LED is in a fixed voltage supply condition because of the parameter. Changes, such as factory parameter deviations, temperature, wire resistance, etc., do not achieve a stable load current. In practical applications, when the amount of LED load changes, the supply current needs to be properly adjusted. The system voltage will change with the supply current change, not a constant value.
  • the parallel connection LED power supply system in the prior art generally includes the following categories: a fixed output voltage power supply, through the internal resistance of the light emitting diode and the system wiring resistance current limit, due to a large number of parameters, this scheme is difficult to accurately calculate the load current. Regulation, generally only for low-demand products. Fixed output voltage power supply, in each LED unit plus upper limit flow circuit to achieve steady flow, can effectively and accurately control the current, but the system components are large, which is unfavorable to reduce costs and improve reliability.
  • the adjustable current source is powered. It is necessary to adjust the output current of the power supply according to the number of known LEDs in the system. It is easy for the installer who is unfamiliar with the electrical characteristics of the LED light source to cause incorrect settings, affect the system life, and even cause safety problems. .
  • An object of the present invention is to provide an automatic current identification method for an LED for illumination, which automatically recognizes when certain LED parameters in a parallel network of LEDs change, or when a new branch is added to a parallel network of LEDs. The current requirement of the load, and the output current is adjusted appropriately.
  • the present invention provides an automatic current identification method for a light-emitting diode network for illumination, which is used for identifying a supply current required for a light-emitting diode network, the light-emitting diode network including at least two parallel branches, and each strip At least one light-emitting diode is connected in series on the branch circuit, and the method comprises the following steps: a) providing an identification resistor in each branch that is inversely proportional to the current demand of the branch, so that the identification resistance and the branch current demand in each branch The products are equal; b) applying a detection voltage across the identification resistors that is less than the conduction voltage of the LEDs in the branch, thereby
  • the reference current is converted into a reference voltage by a current-voltage conversion current to supply a control power source for driving the LED network.
  • the product of the equivalent resistance and the branch current demand is a constant having a first value.
  • the ratio of the drive current to the reference current is a constant having a second value.
  • one end of the identification resistor disposed in the branch is connected to one identification terminal, and the other end is connected to the negative output of the control power source.
  • one end of the identification resistor disposed in the branch is connected to one identification terminal, and the other end is connected to the negative output of the control power source.
  • both ends of the identification resistor disposed in the branch are respectively connected to the positive input and the negative input of the LED network.
  • FIG. 1 is a structural diagram of a light emitting diode network.
  • FIG. 2 is a circuit diagram of a circuit upon which an identification method is based in accordance with the present invention.
  • Figure 3 is a circuit diagram of a circuit on which an improved identification method is based.
  • Fig. 4 is a circuit diagram of a circuit on which the identification method of the identification terminal is added.
  • FIG. 5 is a circuit diagram of a circuit on which an identification method of the identification terminal and the identification circuit terminal is added.
  • Figure 6 is a circuit diagram of a circuit that converts the identification current into an identification voltage.
  • Figure 7 shows the structure after replacing the identification resistor with a current source.
  • FIG. 1 shows the structure of an LED network to which the current amount automatic discrimination method of the present invention is applied. It is composed of a first branch B1, a second branch B2, a third branch B3, a fourth branch B4 and a fifth branch B5; wherein, the first branch Bl and the second branch B2
  • the three-way B3, the fourth branch B4, and the fifth branch B5 respectively include a plurality of light-emitting diodes connected in series.
  • the module can be powered by a control power supply, and its positive and negative terminals are respectively connected to the positive power supply terminal +Ve and the negative power supply terminal Rtn.
  • the branch circuit B3, the fourth branch road B4 and the fifth branch road B5 respectively identify the resistors R1, R2, R3, R4 and R5 in parallel, as shown in Fig. 2, that is, the identification resistor R1 is connected in parallel to the first branch, and the identification resistor R2 is connected in parallel.
  • the identification resistor R3 is connected in parallel to the third branch
  • the identification resistor R4 is connected in parallel to the fourth branch
  • the identification resistor R5 is connected in parallel to the fifth branch.
  • the illuminating diode generally has a forward voltage of 3.5 to 4.5 V.
  • the detection of Rtot is achieved by the following steps: a) The LED driving power supply outputs a detection voltage Vdet lower than the LED conduction level. b) Measure the equivalent resistance value by means of the corresponding measuring circuit or measuring microcomputer.
  • the measuring method is as follows: First, set the current demand of each branch, for example 1.4 A. Secondly, a reference current Iref flowing through the parallel identification resistors R1, R2, R3, R4 and R5 is selected to indicate flow through the first branch, the second branch, the third branch, the fourth branch and the fifth The total current value of the branch, that is, the output current lout of the power supply, wherein the reference current Iref is output in equal proportion to the power supply output current Itot.
  • the selection of the reference current needs to meet the following principles. First, the current should not be too small. If the current is too small, the circuit will be easily disturbed by environmental electrical noise. Secondly, the current should not be too large. If the current is too large, unnecessary power consumption is caused. Will lead to increased costs and volume. For example, you can choose Iref as lOuA to indicate that Itot is 1A. In this case, the reference current to the output current conversion constant, that is, the ratio of the output current to the grass-baked current K1 is 1/1000000, and Iref can be selected as 10mA. It is indicated that Itot is 1A, and in this case, the conversion constant K1 of the reference current to the output current is 1/100. Both of the above options are feasible.
  • the detection voltage Vdet is connected between the positive power supply terminal +Ve and the negative power supply terminal Rtn.
  • the selection principle of the detection voltage is that it must be smaller than the maximum conduction voltage required on each branch, but it cannot be too small or too small. Detecting the voltage makes the circuit susceptible to parameter variations and electrical noise; it should not be too large, too large a detection voltage will cause unnecessary losses, and product cost and volume increase. Under such constraints, the designer would choose Vdet equal to IV, 2.5V, 5V or 10V.
  • the conversion constant K1 of the reference current to the output current is selected to be 1/100
  • the resistance of the LED current representing 1A is 1K ohm
  • the resistance of the LED current of 2A is 500 ohm.
  • R6 is much smaller than the equivalent resistance Rtot of R1 to R5 in parallel, which can reduce the detection error.
  • the operational amplifier U1B makes the voltage drop across R5 equal to the voltage drop across R6.
  • the collector current of the transistor Q1 is inversely proportional to Iref.
  • the voltage drop V_Iref on R8 is proportional to Iref, and the power supply establishes the LED driving current through V_Iref. If the resistors R1-R5 are replaced by current sources, the amount of identification current can be directly measured and then converted into the output current of the power supply, as shown in FIG. c)
  • the LED driving power supply raises the output voltage to the normal working voltage and enters the steady current working mode. The current is determined by the measured Rtot.
  • the identification resistor in the above embodiment can achieve the function of automatically recognizing the current demand, connecting the identification resistor to the LED network inevitably leads to unnecessary power consumption. Therefore, as a modification of the above specific embodiment, in the second embodiment of the present invention, referring to FIG. 3, a control switch is added to the loop where the identification resistor is located, that is, the control switch S1 is connected in series to the circuit of the identification resistor R1. , the control switch S2 is connected in series to the circuit of the identification resistor R2, the control switch S3 is connected in series to the circuit of the identification resistor R3, the control switch S4 is connected in series to the circuit of the identification resistor R4, and the control switch S5 is connected in series to the circuit of the identification resistor R5.
  • the identification of the current can be realized by adding the identification end.
  • the specific description is as follows: Add the identification end ID, and between the identification end ID and the negative power supply end Rtn, the first branch, the second branch, the third branch, the fourth branch and the fifth branch are respectively parallel identification resistors Rl , R2, R3, R4 and R5.
  • the structure after the addition is as shown in FIG.
  • the resistor R1 is connected between one end of the first branch and the identification end ID
  • the resistor R2 is connected between one end of the second branch and the identification end ID
  • the resistor R3 is connected to the third.
  • a resistor R4 is connected between one end of the fourth branch and the identification end ID
  • the resistor R5 is connected between one end of the fifth branch and the identification end ID.
  • the identification resistance R4 can be changed proportionally with the change of the parameters of the fourth branch
  • the identification resistance R5 can be proportionally changed with the change of the parameters of the fifth branch.
  • Chemical. When the number of LEDs in the diode network is large, the voltage on the Rtn return line of the negative supply terminal will increase to a value sufficient to affect the voltage of the identification terminal ID. If this happens, the identification circuit end IDrtn can be increased. And disconnecting the identification resistors R1, R2, R3, R4, and R5 from the first branch, the second branch, the third branch, the fourth branch, and the fifth branch, respectively, and identifying the loop end IDrtn Connected as shown in Figure 5.
  • the identification resistor is connected in parallel by the identification terminal ID and the identification loop terminal IDrtn.
  • the positive power supply terminal +Ve and the negative power supply terminal Rtn connect the first branch and the second branch to the fifth branch in parallel.
  • the total resistance of the identification resistor is determined by the same method as described above, and is assigned to the identification resistors R1 to R5, and then the bias is applied to the identification terminal ID and the identification loop terminal IDrtn, that is, the identification voltage.
  • Vdet thereby obtaining the reference current Iref, is converted into a control voltage signal by the circuit in Fig. 3, by which the output of the power supply can be controlled.

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

Abstract

L'invention concerne un procédé d'identification automatique du courant dans des diodes électroluminescentes (LED) d'éclairage, utilisé pour identifier le courant d'alimentation nécessaire dans un réseau de LED. Le réseau de LED comprend au moins deux branches parallèles, au moins une LED étant connectée en série dans chaque branche. Le procédé comprend les étapes suivantes : a) chaque branche est conçue pour comprendre une résistance d'identification qui est inversement proportionnelle au courant dont la branche a besoin, de sorte que le produit de la résistance d'identification et du courant de la branche est respectivement égal dans chaque branche; b) une tension d'essai est appliquée à la résistance d'identification de manière à obtenir un courant de référence, la valeur de la tension d'essai étant inférieure à la tension de conduction de sa branche; c) lorsque les paramètres de certaines LED du réseau parallèle de LED changent, ou lorsqu'une nouvelle LED est ajoutée au réseau parallèle de LED, le besoin en courant de la charge est identifié automatiquement et le courant de sortie est ajusté en conséquence.
PCT/CN2010/070465 2009-02-10 2010-02-02 Procédé d'identification automatique du courant dans des led d'éclairage Ceased WO2010091619A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2009100086590A CN101483953B (zh) 2009-02-10 2009-02-10 照明用发光二极管电流自动辨识方法
CN200910008659.0 2009-02-10

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WO2010091619A1 true WO2010091619A1 (fr) 2010-08-19

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224348A1 (de) * 2012-06-25 2014-01-02 Osram Gmbh Beleuchtungsanlage mit einer Schnittstelle aufweisend ein Netzgerät und mindestens ein Lichtquellenmodul
DE102012224141A1 (de) * 2012-12-21 2014-06-26 Tridonic Gmbh & Co Kg Erfassung von Betriebsparametern eines LED-Moduls
WO2013186655A3 (fr) * 2012-06-14 2014-10-23 Koninklijke Philips N.V. Commande d'éclairage à autorégulation pour commander des sources d'éclairage et unité d'éclairage comprenant une commande d'éclairage à autorégulation
CN104885564A (zh) * 2012-12-21 2015-09-02 赤多尼科两合股份有限公司 Led模块的检测
DE102014208190A1 (de) * 2014-04-30 2015-11-05 Zumtobel Lighting Gmbh Schaltungsanordnung und Verfahren zum Betreiben von LEDs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101483953B (zh) * 2009-02-10 2012-05-23 黄华南 照明用发光二极管电流自动辨识方法

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WO1996009740A1 (fr) * 1994-09-24 1996-03-28 Blaupunkt-Werke Gmbh Systeme d'eclairage comportant des diodes electroluminescentes montees en serie
JP2007122982A (ja) * 2005-10-26 2007-05-17 Matsushita Electric Works Ltd 照明装置
CN201072044Y (zh) * 2007-07-26 2008-06-11 陈平 发光二极管照明灯
CN101247688A (zh) * 2007-02-13 2008-08-20 飞思卡尔半导体公司 用于设定发光半导体元件的工作电流的方法和装置
CN101483953A (zh) * 2009-02-10 2009-07-15 黄华南 照明用发光二极管电流自动辨识方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996009740A1 (fr) * 1994-09-24 1996-03-28 Blaupunkt-Werke Gmbh Systeme d'eclairage comportant des diodes electroluminescentes montees en serie
JP2007122982A (ja) * 2005-10-26 2007-05-17 Matsushita Electric Works Ltd 照明装置
CN101247688A (zh) * 2007-02-13 2008-08-20 飞思卡尔半导体公司 用于设定发光半导体元件的工作电流的方法和装置
CN201072044Y (zh) * 2007-07-26 2008-06-11 陈平 发光二极管照明灯
CN101483953A (zh) * 2009-02-10 2009-07-15 黄华南 照明用发光二极管电流自动辨识方法

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9215768B2 (en) 2012-06-14 2015-12-15 Koninklijke Philips N.V. Self-adjusting lighting driver for driving lighting sources and lighting unit including self-adjusting lighting driver
WO2013186655A3 (fr) * 2012-06-14 2014-10-23 Koninklijke Philips N.V. Commande d'éclairage à autorégulation pour commander des sources d'éclairage et unité d'éclairage comprenant une commande d'éclairage à autorégulation
RU2632186C2 (ru) * 2012-06-14 2017-10-04 Филипс Лайтинг Холдинг Б.В. Саморегулирующийся возбудитель освещения для возбуждения источников освещения и блок освещения, включающий в себя саморегулирующийся возбудитель освещения
DE102012224349A1 (de) * 2012-06-25 2014-01-02 Osram Gmbh Beleuchtungsanlage mit einer Schnittstelle aufweisend ein Netzgerät und mindestens ein Lichtquellenmodul
DE102012224348A1 (de) * 2012-06-25 2014-01-02 Osram Gmbh Beleuchtungsanlage mit einer Schnittstelle aufweisend ein Netzgerät und mindestens ein Lichtquellenmodul
US9445466B2 (en) 2012-06-25 2016-09-13 Osram Gmbh Lighting system with an interface having a power supply unit and at least one light source module
US9554430B2 (en) 2012-06-25 2017-01-24 Osram Gmbh Lighting system with an interface having a power supply unit and at least one light source module
US9609700B2 (en) 2012-06-25 2017-03-28 Osram Gmbh Light engine module, related power supply unit and lighting system
DE102012224141A1 (de) * 2012-12-21 2014-06-26 Tridonic Gmbh & Co Kg Erfassung von Betriebsparametern eines LED-Moduls
CN104885564A (zh) * 2012-12-21 2015-09-02 赤多尼科两合股份有限公司 Led模块的检测
US9544970B2 (en) 2012-12-21 2017-01-10 Tridonic Gmbh & Co Kg Detection of an LED module
DE102014208190A1 (de) * 2014-04-30 2015-11-05 Zumtobel Lighting Gmbh Schaltungsanordnung und Verfahren zum Betreiben von LEDs
EP3138368B1 (fr) * 2014-04-30 2020-06-10 Zumtobel Lighting GmbH Ensemble circuit et procédé de commande de led

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Publication number Publication date
CN101483953A (zh) 2009-07-15
CN101483953B (zh) 2012-05-23

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