CN102415213A - Driver for led lamp - Google Patents

Driver for led lamp Download PDF

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Publication number
CN102415213A
CN102415213A CN2010800180269A CN201080018026A CN102415213A CN 102415213 A CN102415213 A CN 102415213A CN 2010800180269 A CN2010800180269 A CN 2010800180269A CN 201080018026 A CN201080018026 A CN 201080018026A CN 102415213 A CN102415213 A CN 102415213A
Authority
CN
China
Prior art keywords
led
lighting apparatus
string
current
led1
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.)
Pending
Application number
CN2010800180269A
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Chinese (zh)
Inventor
M·C·维穆伦
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of CN102415213A publication Critical patent/CN102415213A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light
    • H05B45/14Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light
    • H05B45/12Controlling the intensity of the light using optical feedback
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light
    • H05B45/18Controlling the intensity of the light using temperature feedback
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20Controlling the colour of the light
    • H05B45/24Controlling the colour of the light using electrical feedback from LEDs or from LED modules
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/395Linear regulators
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40Details of LED load circuits
    • H05B45/44Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

An illumination device (100), comprises: a current source (1) having output lines (5; 6); a main string (101) of LEDs (LED1,i) arranged in series between the current source output lines; at least one secondary string (102) of LEDs (LED2,i) arranged in series between the current source output lines; and a controllable current limiter (120) arranged in series with the LEDs (LED2,i) of the secondary string (102). In a preferred embodiment, the controllable current limiter comprises: - a transistor (T2) having its collector-emitter path in series with the LEDs (LED2,i) of the secondary string (102); a current sense resistor (R2x) arranged in series with said collector-emitter path; an opamp (121) having an output connected to the transistor's base, having its inverting input connected to said current sense resistor (R2x), and having its non-inverting input connected to a reference voltage level.

Description

The driver that is used for the LED lamp
Technical field
The present invention relates generally to a kind of lighting apparatus that comprises a plurality of LED and single current source.
Background technology
In recent years, the lighting apparatus that comprises led light source has had significant progress.Likewise, developed the driver that is used for this kind equipment.A kind of direct mode to the LED power supply is between the lead-out terminal of current source, to connect a string LED that is connected in series.Fig. 1 is the block diagram that schematically shows this design, and wherein current source 1 is implemented as traditional copper iron ballast, and it has the input terminal that is connected to civil power 2, induced impedance 3 and the rectifier 4 of arranged in tandem.The one LED string 11 is connected between the lead-out terminal 5 and 6 of rectifier 4.
The number that those skilled in the art know that the LED of series connection depends on the pressure drop of each LED and the voltage available between lead-out terminal 5 and 6.If the number of LED is excessive, then LED can not be luminous.If the number of LED is very few, then series resistance should adapt to the voltage difference between power supply and the LED; For for simplicity, not shown this resistance.
If hope to increase the number of LED, then can between the lead-out terminal 5 and 6 of rectifier 4, connect equally as illustrated in fig. 1 with first string, 11 the 2nd parallelly connected LED and go here and there 12.For the difference on the adaptive character, each string should have the series resistance of himself, but for for simplicity, not shown this resistance.The electric current I that power supply 1 provides TOTALCorresponding two electric current I 1 and electric current I 2 that are divided into two strings 11 and 12, thereby I1+I2=I TOTALCan also connect the 3rd string, the 4th string etc. based on the magnitude of current that power supply can provide parallelly connectedly.
Though the design that Fig. 1 provides has the advantage of simplicity, it has the shortcoming that can't between different strings, change power ratio, in other words, promptly can't change ratio I1: I2.This maybe not can throw into question when all LED types (color) are identical.Yet in more common design, LED has various colors; And expectation changes the current ratio of string to change overall color output; Perhaps, conversely, under the situation of variation of temperature; The LED that considers dissimilar (colors) has the different temperature attribute separately, and the current ratio that expectation changes string keeps the constant of overall color output.
Summary of the invention
The object of the present invention is to provide and wherein can change the power ratio between the said string to the simple ballast of two or more LED statements based on collusion electricity.
According to an important aspect of the present invention, lighting apparatus is included in the main LED string that is provided with between the power outlet line of current source.Secondary LED string and controllable current limiter and said main connection in series-parallel setting that series connection is provided with.Be used for the node reception electric power of the controller of Control current limiter from main string.
Further advantage explanation is described in the dependent claims.
Description of drawings
Will with reference to accompanying drawing through describing below of one or more preferred embodiments further specified of the present invention these with some other aspect, feature and advantage, identical reference number is represented identical or close parts in the accompanying drawing, and wherein:
Fig. 1 is the block diagram that schematically shows the usual manner of LED power supply, and it has a string LED that is connected in series, and LED is connected between the lead-out terminal of current source;
Fig. 2 is the block diagram that schematically shows according to lighting apparatus of the present invention;
Fig. 3 is the figure according to the electric current of time that shows in lighting apparatus according to the present invention.
Embodiment
Fig. 2 is the block diagram that schematically shows according to lighting apparatus 100 of the present invention.This equipment has power circuit 5,6, and it is equal to or is connected to current output terminal of current source 1 usually, and this current source has the design that is fit to arbitrarily in principle and can be equal to the current source among Fig. 1.Suppose that this power circuit 5,6 is loaded with the electric current through the AC of rectification, these top line 5 relative lower-class lines 6 are positive, even but main points of the present invention are that power circuit 5,6 is loaded with the DC electric current and still can uses.The electric current that is received from power supply can be indicated as I TOTAL
This equipment 100 comprise be one another in series be provided with and connect with resistor R 1 be provided be connected in power circuit 5, the main LED between 6 goes here and there 101.Electric current definition in this string is indicated as I1.LED in this string is indicated as LED1, i, and wherein the scope of i is from 1 to n, n is the number of LED in the main string 101.
This equipment 100 comprises that LED is one another in series and is provided with and resistors in series R2 series connection is provided with is connected in power circuit 5, the secondary string 102 between 6.Electric current in secondary string is indicated as I2.LED in this string is indicated as LED2, i, and wherein the scope of i is from 1 to n, n is the number of the LED in the secondary string 102.The number of noticing the LED in the secondary string 102 can be different with the number of LED in the main string 101.
Equipment 100 further comprises controllable current limiter 120, its setting of connecting with secondary string 102, and more specifically it is arranged on the power circuit 6 and last LEDLED2 of foot, between the n.This controlled demand limiter 120 is embodied as NPN transistor T2 in this mode through example; The collector electrode of this NPN transistor T2 is connected to last LEDLED2; N; Its emitter is connected to this foot power circuit 6 via current sensing resistor R2x, and its base stage is connected to the output of operational amplifier (opamp) 121.The anti-phase input of operational amplifier 121 is connected to transistorized emitter.The noninverting of operational amplifier 121 is connected to the power circuit 6 of foot via capacitor 122, and is connected to the output of microcontroller 124 via resistor 123.
The autonomous string 101 of the electric power source of microcontroller 124.In a typical example, each LED in this string has the forward voltage of about 3.5V to 4V.Therefore, at LED LED1 second from the bottom, (n-1) with LED LED1 third from the bottom, the node A between (n-2), available voltage is about 7V-8V.This voltage is used for after the level that comprises diode 125, capacitor 126 and pressurizer 127 is carried out rectification microcontroller 124 power supply, and this pressurizer 127 normally 78L05 perhaps similarly is used to provide the parts of 5V DC.If the scope of the operating voltage of this microcontroller is identical with the scope of the forward voltage of one or more LED, then can omit voltage regulator.
Before operation is described, notice by what microprocessor 124 drew to be indicated as I 1, μ CTo such an extent as to minimum can ignoring of electric current, thereby make that to the influence of current i n and to by latter two LED LED1 (n-1) and LED1, the influence of the light of the emission of n can be ignored.Be also noted that to have the second subprime string 103 parallelly connected with main string 101, as shown in the figure, second subprime string 103 and secondary string 102 are similar.Can add more secondary string.Each another secondary string 103 has the controllable current limiter 220 of himself.In Fig. 2, suppose the power circuit that is associated 225,226,227 that second subprime string 103 has the microprocessor 224 of himself and is connected to node A.Yet, can omit this power circuit 225,226,227, and supply power from 125,126,127 pairs of microprocessors of power circuit 224 of first level string 102.If first microprocessor 124 has second lead-out terminal that is used to control the second controllable current limiter 220, what for to omitting second microprocessor 224; In other words, microprocessor 124,224 can be integrated.
From the purpose of description operation, at first suppose this transistor T 2 complete conductings.Current amplitude I1 and I2 will be provided with self based on the dynamic electric resistor of the number of the LED in each string and corresponding LED.This situation is by shown in the subgraph of Fig. 3 left side, its shown according to the time (transverse axis, electric current ms) (longitudinal axis, mA).Electric current I 1 in this example in the main string 101 has the amplitude of 700mA and the electric current I 2 in the secondary string 102 has the amplitude of 300mA.Therefore, I TOTALAmplitude with 1000mA.
The user that microcontroller 124 has the signal to greatest extent of the electric current I 2 that is used for importing the secondary string 102 of indication imports 128.Based on this input signal, microcontroller 124 is created on the output signal of the noninverting input setting reference levels of operational amplifier 121.In an illustrated embodiment, microcontroller 124 produces the current impulse (PWM) of variable duration, thereby causes the voltage levvl based on pulse duration in the noninverting input of operational amplifier 121.As long as this voltage levvl is higher than the voltage levvl of the anti-phase input of operational amplifier, then this operational amplifier just produces high output signal, thereby keeps transistor T 2 conductions.The voltage levvl of the anti-phase input of operational amplifier is always proportional with electric current I 2.
Suppose that the user changes the user and imports 128 setting; Reduce the pulse duration of the output pulse of operational amplifier; And thereby the voltage levvl of noninverting input that reduces operational amplifier 121 is to equaling 250mA, and it is lower than the amplitude of the voltage signal that measurement resistor R2x provides.This situation is shown in the subgraph of the right side of Fig. 3.At first, electric current I 2 likewise increases from 0, and I2 equals 250mA up at about 8ms the time, and this is enough to make operational amplifier 121 partly to break off transistor T 2.Particularly, this transistor is retained as just in time is enough to conducting, equals 250mA (flat of curve among Fig. 3) thereby electric current I 2 remained.Therefore, with regard to peak current and average current, with the left side contrast of this figure, the electric current I 2 in the secondary string 102 reduces.At the peak value place of 10ms, total current I TOTALRemain 1000mA, therefore the peak current of I1 is 750mA now in this example.
Therefore, can find out the ratio that can change between I2 and the I1.
Notice and to import 128 place's control input signals with what many modes generated microcontroller 124 at it.For example, this equipment can have the temperature that is used for the induction LED assembly and the temperature inductor of temperature signal to the input of microcontroller is provided, and wherein this microcontroller can be programmed with the change current ratio, thus the influence of compensation temperature.In addition, this equipment can have the light output that is used to measure two strings and the optical inductor of light signal to the microcontroller input is provided, and wherein this microcontroller can be programmed to keep light output constant.In addition, this equipment can have user input device, such as the potentiometer that is connected to the microcontroller input.In addition, microcontroller can be in response to the Long-distance Control that is used to carry out wireless user's control.Can make up top option (or some other option).
In sum, the present invention provides a kind of lighting apparatus 100, comprising:
Current source with outlet line 5,6;
The LED master that series connection is provided with between the current source outlet line goes here and there 101;
At least one the LED time level string 102 that series connection is provided with between the current source outlet line;
And the controllable current limiter 120 of connecting and being provided with the LED of secondary string 102.
In a preferred embodiment, the controllable current limiter comprises:
Transistor T 2, it has the collector electrode-emitter path of connecting with the LED of secondary string 102;
The current sensing resistor R2x that connects and be provided with the path of said collector electrode-emitter;
Operational amplifier 121, it has the output that is connected to transistor base, has the anti-phase input that is connected to said current sensing resistor R2x, and the noninverting input with the reference voltage level of being connected to.
Though in accompanying drawing and description before, at length illustrate and described the present invention, those skilled in the art should know that this illustrates and describes and should be considered to illustrative or exemplary and nonrestrictive.The invention is not restricted to the disclosed embodiments; But in the protection scope of the present invention that in appended claims, limits some variations and modification can be arranged.For example, can omit diode 125, perhaps can be substituted by two diodes that series connection is provided with.In addition, can implement demand limiter in a different manner.
As stated, once mentioned to have two or more secondary strings.When determining the number of LED string, can consider some design factors.On the one hand, when connecting all secondary strings, all secondary strings all need certain current amplitude, and current source should be able to provide this electric current.On the other hand, when all secondary strings all break off, total current I completely TOTALTo flow through main string 101 and this should not cause this string overcurrent.
Those skilled in the art are appreciated that and realize some other variation of the disclosed embodiments in putting into practice the present invention for required protection according to the research to accompanying drawing, disclosure and appended claims.In claims, wording " comprises " expression and does not get rid of other element or step, and indefinite article " ", and " one " does not get rid of a plurality of situation.Single processor or other unit can be implemented in the function of the different item of narrating in claims.In fact, some scheme of narrating in the mutually different dependent claims does not represent that the combination of these schemes can't be used for benefiting.Any reference marker should not be interpreted as the qualification to scope in claims.
Above with reference to block diagram illustrations the present invention, this block diagram shows the functional module according to equipment of the present invention.Be appreciated that; Can implement one or more in these functional blocks with hardware; In this hardware; Carry out the function of this functional block through each nextport hardware component NextPort, but also can be with in these functional blocks of software implementation one or more, thereby make the function of carrying out this functional block by one or more program lines of computer program or programming device (such as microprocessor, microcontroller, numerical signal processor etc.).

Claims (11)

1. a lighting apparatus (100) comprising:
Current source (1), it has outlet line (5; 6);
(its series connection is arranged between the current source outlet line (5,6) LED for LED1, main string (101) i);
(its series connection is arranged between the power supply output line road (5,6) LED for LED2, the secondary string of i) at least one (102);
And controllable current limiter (120), (LED2, i) series connection is provided with the LED of itself and said secondary string (102).
2. lighting apparatus according to claim 1, wherein said controllable current limiter (120) comprises:
Transistor (T2), it has LED (LED2, i) collector electrode-emitter path of series connection with said secondary string (102);
Current sensing resistor (R2x), its setting of connecting with said collector electrode-emitter path is coupling between (6) in said transistorized emitter and the said current source outlet line;
Operational amplifier (121), it has the output that is connected to said transistor base, the anti-phase input that is connected to the node between said emitter and the said current sensing resistor (R2x) and the noninverting input that is connected to reference voltage level.
3. lighting apparatus according to claim 2, wherein said reference voltage level is provided by controllable pulse generator (124) and pip integrator level (123,122).
4. lighting apparatus according to claim 3, wherein said pulse generator (124) is implemented as microprocessor.
5. lighting apparatus according to claim 3, wherein said pulse generator (124) have the control input (128) that is used to receive control input signals.
6. lighting apparatus according to claim 5; The temperature inductor that further comprises the temperature that is used to respond to said LED assembly, and wherein said pulse generator (124) in response to the temperature signal of said inductor to change the electric current (I1 in said main string and the said secondary string; I2) ratio between, thereby compensation temperature effect.
7. lighting apparatus according to claim 5 further comprises the optical inductor of the light output that is used to measure two strings, and wherein said pulse generator (124) keeps the constant of said light output in response to the light signal of said inductor.
8. lighting apparatus according to claim 5 further comprises user input device, such as the potentiometer that is connected to said control input (128).
9. lighting apparatus according to claim 3; Further comprise the low-power voltage source (125,126,127) that is used for controllable pulse generator (124); Said low-power voltage source (125,126,127) has two adjacent LED (LED1, i that are connected to said main string (101); LED1, the power input of the node (A) between i+1).
10. lighting apparatus according to claim 9, wherein said node (A) be positioned at from said main string (101) second from the bottom and the 3rd LED (LED1, (n-2); LED1, (n-1)) between.
11. lighting apparatus according to claim 9; Wherein said low-power voltage source (125,126,127) comprises pressurizer (127); Said pressurizer (127) preferably has the diode (125) that is arranged between its input terminal and the said node (A), and said pressurizer (127) preferably has the capacitor parallelly connected with its input terminal (126).
CN2010800180269A 2009-04-23 2010-04-16 Driver for led lamp Pending CN102415213A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09158610 2009-04-23
EP09158610.7 2009-04-23
PCT/IB2010/051662 WO2010122463A1 (en) 2009-04-23 2010-04-16 Driver for an led lamp

Publications (1)

Publication Number Publication Date
CN102415213A true CN102415213A (en) 2012-04-11

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CN2010800180269A Pending CN102415213A (en) 2009-04-23 2010-04-16 Driver for led lamp

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EP (1) EP2422583A1 (en)
JP (1) JP2012524961A (en)
KR (1) KR20120018773A (en)
CN (1) CN102415213A (en)
CA (1) CA2759448A1 (en)
RU (1) RU2011147477A (en)
WO (1) WO2010122463A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104303597A (en) * 2012-05-15 2015-01-21 皇家飞利浦有限公司 Light source circuitry
CN108571665A (en) * 2017-03-07 2018-09-25 B/E航空公司 LED bulb and its operating method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011050908A1 (en) * 2011-06-08 2012-12-13 Dietmar Müller Light-emitting diode lamp and circuit for controlling a light source
JP5426802B1 (en) * 2012-02-07 2014-02-26 パナソニック株式会社 Light emitting circuit, light emitting module, and lighting device
CN102856892B (en) * 2012-04-18 2016-03-30 张宏志 A kind of power supply
KR20160014379A (en) 2014-07-29 2016-02-11 주식회사 실리콘웍스 Lighting apparatus
EP3189710A4 (en) * 2014-09-04 2018-03-21 Rensselaer Polytechnic Institute N-color scalable led driver

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Publication number Priority date Publication date Assignee Title
US6515434B1 (en) * 1999-10-18 2003-02-04 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Control circuit for LED and corresponding operating method
US20030025120A1 (en) * 2001-08-03 2003-02-06 Koninklijke Philips Electronics N.V. Integrated LED driving device with current sharing for multiple LED strings
US20070080911A1 (en) * 2005-10-11 2007-04-12 Da Liu Controller circuitry for light emitting diodes

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US6515434B1 (en) * 1999-10-18 2003-02-04 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Control circuit for LED and corresponding operating method
US20030025120A1 (en) * 2001-08-03 2003-02-06 Koninklijke Philips Electronics N.V. Integrated LED driving device with current sharing for multiple LED strings
US20070080911A1 (en) * 2005-10-11 2007-04-12 Da Liu Controller circuitry for light emitting diodes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104303597A (en) * 2012-05-15 2015-01-21 皇家飞利浦有限公司 Light source circuitry
CN108571665A (en) * 2017-03-07 2018-09-25 B/E航空公司 LED bulb and its operating method
CN108571665B (en) * 2017-03-07 2020-06-30 B/E航空公司 LED bulb and operation method thereof

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WO2010122463A1 (en) 2010-10-28
RU2011147477A (en) 2013-05-27
JP2012524961A (en) 2012-10-18
CA2759448A1 (en) 2010-10-28
EP2422583A1 (en) 2012-02-29
KR20120018773A (en) 2012-03-05

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Application publication date: 20120411