CN1588523A - Driving device for light-emitting diode tandem - Google Patents

Driving device for light-emitting diode tandem Download PDF

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Publication number
CN1588523A
CN1588523A CNA2004100566932A CN200410056693A CN1588523A CN 1588523 A CN1588523 A CN 1588523A CN A2004100566932 A CNA2004100566932 A CN A2004100566932A CN 200410056693 A CN200410056693 A CN 200410056693A CN 1588523 A CN1588523 A CN 1588523A
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Prior art keywords
converter
voltage
current
led serial
switch
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CNA2004100566932A
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CN100489949C (en
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许宏彬
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AU Optronics Corp
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AU Optronics Corp
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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
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology

Abstract

The invention is a light-emitting diode series driver, including a DC-DC converter, a light-emitting diode series, a switch and a feedback circuit, where the DC-DC converter has a first end and outputs a DC voltage from the first end according to a feedback signal, the light-emitting diode series is connected to the first end of the DC-DC converter, and the switch is connected in series with the light-emitting diode series. As the switch is turned-on, the DC voltage drives the diode series and a DC current flows through the diode series, the feedback circuit outputs a feedback signal according to the DC current. And as the switch is turned-on, the diode series fast emits the light in a preset brightness, and the switch is cut-off, fast goes out.

Description

The drive unit of LED serial
Technical field
The present invention is relevant for the drive unit of a kind of LED serial (string), and particularly relevant for a kind of drive unit that is used for the LED serial of backlight module.
Background technology
(Liquid Crystal Display LCD) uses backlight module to traditional LCD, provides the LCD panel required light, and its light source can (Light emitted diode LED) produces via light emitting diode.LED is a kind of solid-state semiconductor light source, have many characteristics: extra long life, power saving, low-work voltage, low-temperature working and reaction velocity are fast, all be existing cathode fluorescent tube (Cold Cathode Fluorescence Lamp, CCFL) advantage that light source is incomparable is in illumination and the small size mobile phone backlight module more than the light source that makes LED produce has been widely applied to.LED progressively replaces cathode fluorescent tube CCFL and has been following visible trend.
Please refer to Figure 1A, it represents the drive unit circuit diagram of traditional LED serial.This drive unit 100 comprises direct voltage source 102, dc chopper 104, filtering circuit 106 and LED serial 108.Via of the electrical connection of dc chopper 104 control direct voltage sources 102,, promptly be to light or extinguish so that LED serial 108 can conducting or by (turn on/off) to LED serial 108.Because filtering circuit 106 has inductance, so the wave mode of the electric current I of LED serial 108 presents triangular wave, please refer to Figure 1B, therefore can't make LED serial 108 be operated in a fixing conducting electric current.Even in parallel with an electric capacity of voltage regulation at LED serial 108, make the electric current I of LED serial 108 comparatively stable, cross slow phenomenon but have capacitor charge and discharge, and make LED serial 108 conducting fast or end.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of drive unit of LED serial is being provided, to realize being operated in fixedly the conducting electric current and can light or extinguish LED serial fast.
According to purpose of the present invention, a kind of drive unit of LED serial is proposed, comprise DC-to-DC converter (DC-DC converter), LED serial (LED string), switch and feedback circuit.DC-to-DC converter has the first DC-to-DC converter end, and according to feedback signal in the first DC-to-DC converter end output dc voltage.LED serial is connected to the first DC-to-DC converter end.Switch is connected with LED serial.When switch conduction, LED serial is driven by DC voltage, the DC current LED serial of flowing through.Feedback circuit is according to the DC current output feedback signal.Wherein, when switch conduction, LED serial is lighted rapidly to a predetermined luminance, and when switch ended, LED serial extinguished rapidly.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows:
Figure 1A represents the drive unit circuit diagram of traditional LED serial.
Figure 1B represents the electric current I of Figure 1A and the oscillogram of Is.
Fig. 2 represents the drive unit circuit diagram according to a kind of LED serial of the first embodiment of the present invention.
Fig. 3 represents the drive unit circuit diagram according to a kind of LED serial of the second embodiment of the present invention.
Fig. 4 represents the drive unit circuit diagram according to a kind of LED serial of the third embodiment of the present invention.
Fig. 5 represents the circuit diagram of drive unit of the LED serial of boosting type converter.
Fig. 6 represents the circuit diagram of drive unit of the LED serial of liter-step-down controller.
Fig. 7 represents the circuit diagram of drive unit of the LED serial of flyback converter.
Fig. 8 represents the circuit diagram of drive unit of the LED serial of full-bridge converter.
The drawing reference numeral explanation
100: the drive unit of traditional LED serial
102: direct voltage source
104: dc chopper
106: filtering circuit
200: the drive unit of LED serial
108,202: LED serial
204: switch
206: feedback circuit
208: DC-to-DC converter
210: pulse-width modulator
214: current-voltage converter
216: amplifier
218: voltage feedback circuit
D: diode
Rs: resistance
R1, R2: impedance
Embodiment
Embodiment one
Please refer to Fig. 2, its expression is according to the of the present invention first a kind of drive unit circuit diagram of LED serial of executing example.Drive unit 200 can apply in the backlight liquid crystal display module, and it comprises a DC-to-DC converter 208 (DC-DC converter), a LED serial 202 (LEDstring), a switch 204 and a feedback circuit 206.Wherein, in present embodiment, be that buck converter (Buck converter) is that example is done explanation with DC-to-DC converter 208.And LED serial 202 is in order to provide liquid crystal panel required light source.
DC-to-DC converter 208 has the one first DC-to-DC converter end X1 and the second DC-to-DC converter end X2.The second DC-to-DC converter end X2 connects a fixed voltage, and fixed voltage for example is a ground voltage.DC-to-DC converter 208 and foundation one feedback signal fs export a direct current voltage DC in the first DC-to-DC converter end X1.LED serial 202 connects the first DC-to-DC converter end X1.Switch 204 is connected with LED serial 202.When switch 204 conductings, LED serial 202 is driven by this DC voltage DC, and a direct current electric current I ' LED serial 202 of flowing through is to send light source.Feedback circuit 206 and according to DC current I ' output feedback signal fs.
In order to realize making LED serial 202 quick conductings or by (turn on/off), promptly be to light or extinguish, present embodiment reaches above-mentioned order ground via switch 204 is connected with this LED serial 202.When switch 204 conductings, a flowed through fixing conducting electric current and lighting rapidly of LED serial 202 to a predetermined luminance, and when switch 204 ended, the electric current of the LED serial 202 of flowing through stopped immediately and LED serial 202 is extinguished rapidly.So can avoid the energy storage component in the DC-to-DC converter 208 to cause DC current I ' variation slowly, and make LED serial 202 light or the speed extinguished slack-off.More because through the 204 control LED serial 202 quick conductings of switch thus or end, can strengthen the energy storage component of DC-to-DC converter 208, for example the value of electric capacity, inductance makes the DC current I ' of output more stable.
DC-to-DC converter 208 has comprised a pulse-width modulator 210.Feedback circuit 206 makes pulse-width modulator 210 according to the output signal that feedback signal fs adjusts pulse-width modulator 210 according to DC current I ' output feedback signal fs, presses DC so that DC-to-DC converter 208 is exported galvanic currents.Further, feedback circuit 206 comprises a current-voltage converter 214.Current-voltage converter 214 has one first end and second end.First end is connected with switch 204, and its second end is connected with the second DC-to-DC converter end X2 of DC-to-DC converter 208.Current-voltage converter 214 for example is a resistance R s.When switch 204 conductings, DC current I ' inflow current-electric pressure converter 214, make current-voltage converter 214 according to DC current I ' generation one first reference voltage V1 with as feedback signal fs.Make DC-to-DC converter 208 according to the size of feedback signal fs control DC current I ', to realize the constant of backlight module colour temperature.
Very and, in another embodiment that derives because of present embodiment, when each freedom of a plurality of LED serials DC-to-DC converter separately drives, just can be via separately feedback circuit size with control DC current I ' separately, make the light emitting diode of different qualities on different LED serial 202, all can have the electric current of identical size to flow through, to produce identical brightness, and do not have difference in the brightness, can make that the brightness of backlight module of being made up of a plurality of LED serials is more even.
Embodiment two
Please refer to Fig. 3, its expression is according to the of the present invention second a kind of drive unit circuit diagram of LED serial of executing example.Places different with first embodiment in the present embodiment are that drive unit 200 also comprises an amplifier 216, bridge between first end and pulse-width modulator 210 of current-voltage converter 214.And the resistance R s ' of present embodiment can use the resistance value littler than the value of the resistance R s of first embodiment, can reduce the power attenuation of resistance R s '.The first less reference voltage V1 ' produces feedback signal fs ', to export pulse-width modulator 210 to after amplifying via amplifier 216 again.So, present embodiment still can produce the approaching feedback signal fs ' of feedback signal fs of the voltage swing and first embodiment, make DC-to-DC converter 208 can the samely control the size of DC current I ' according to feedback signal fs ', so that the brightness of LED serial can be kept is fixing, realize the constant of backlight module colour temperature.More feasible in another embodiment that derives because of present embodiment, when a plurality of LED serials are driven by separately DC-to-DC converter, just can be via separately feedback circuit size with control DC current I ' separately, make the light emitting diode of different qualities on different LED serial 202, all can produce identical brightness, and do not have difference in the brightness, so that brightness of backlight module is average.
Embodiment three
Please refer to Fig. 4, its expression is according to the drive unit circuit diagram of a kind of LED serial of the third embodiment of the present invention.In first embodiment and second embodiment, when switch 204 ends, because DC current I ' can not produce, so feedback circuit 206 can not " come output feedback signal fs " according to the first reference voltage V1, and the DC-to-DC converter 208 of this moment can't learn that just the magnitude of voltage of present DC voltage DC is to control, the skew that this will cause DC voltage DC when LED serial 202 is lighted once more, can't realize predetermined brightness fast.
So present embodiment and the different place of first and second embodiment are that feedback circuit 206 also comprises a voltage feedback circuit 218.When switch 204 by the time, voltage feedback circuit 218 more produces one second reference voltage V2 with as feedback signal fs according to DC voltage DC ".
Furthermore, voltage feedback circuit 218 comprises one first impedance R1, one second impedance R2 and a diode D.The first impedance R1 has one first impedance, first end and one first impedance, second end, and first impedance, first end connects DC voltage DC, and first impedance, second end connects a node N.Node N is connected to pulse-width modulator 210.The end connected node N of the second impedance R2, the other end of the second impedance R2 is connected and fixed voltage.The negative terminal of diode D (N end) is connected to node N, and the anode of diode (P end) then is connected to first end of current-voltage converter 214.The voltage of node N is as the second reference voltage V2.That is to say that when switch 204 ended (turn off), diode D also ended, this moment, the second reference voltage V2 was decided by the dividing potential drop of the first impedance R1 and the second impedance R2 by DC voltage DC.This moment feedback circuit 206 with the second reference voltage V2 as feedback signal fs " to feed back to pulse-width modulator 210.So, when switch 204 ends, when LED serial 202 extinguishes, DC-to-DC converter 208 is according to the second reference voltage V2 that is fed back, keep the size of DC voltage DC, make when switch 204 is followed conducting, can be because of the long skew that causes the magnitude of voltage of DC voltage DC closing time.So, when LED serial 202 is lighted once more, the electric current that approaches the size of DC current I ' will flow through LED serial 202 apace, make LED serial 202 can realize predetermined brightness fast.
Same, when switch 204 conductings, most DC current I ' inflow current-electric pressure converter 214 makes current-voltage converter 214 according to the DC current I ' generation first reference voltage V1 ".But that different is the first reference voltage V1 " by with diode D conducting to determine the second reference voltage V2.This moment feedback circuit 206 "; but condition precedent is the first reference voltage V1 " must allow diode D conducting as feedback signal fs with the second reference voltage V2, when promptly being switch 204 conductings, the first reference voltage V1 " must be greater than the voltage of node N to determine the second reference voltage V2.
Below will further specify and how allow the first reference voltage V1 " by with diode D conducting to determine the second reference voltage V2.When supposing that switch 204 ends, diode D also ends, this moment DC voltage DC=Vo (off)=Vref (1+R1/R2) (formula one), Vref is a reference signal, comparer in the pulse-width modulator 210 receives this reference signal, and " makes comparisons with feedback signal fs.The first reference voltage V1 "=Vx (off)=0.Suppose when switch 204 conductings DC voltage DC=Vo (on), the first reference voltage V1 "=Vx (on).The first reference voltage V1 " by with diode D conducting to determine the second reference voltage V2, reach this purpose, then must allow the diode D can conducting.By feedback circuit, equal Vref because the voltage of node N can be adjusted to, so the first reference voltage V1 " be (Vref+VD_drop), wherein, the forward bias voltage drop when VD_drop is diode D conducting.Electric current I o=(Vref+VD_drop)/Rs of the resistance R of flowing through s.
At this moment, by the KCL law as can be known, the electric current that flows into node N equals to flow out the electric current (voltage of node N is Vref, and the electric current that flows through diode D is ID) of node N.So can get:
Vref/R2＝ID+(Vo(on)-Vref)/R1；
Vref(1+R1/R2)＝R1*ID+Vo(on)；
By (formula one) as can be known, Vo (off)=Vref (1+R1/R2);
So can get Vo (off)=R1*ID+Vo (on) (formula two).
When switch 204 conductings, in order to allow the diode D can conducting, electric current I D needs greater than zero.So Vo (on) must just can make the first reference voltage V1 " can feed back to pulse-width modulator 210 less than Vo (off).Yet, in fact when the design total system, can obtain the value of Vo (on) earlier, find out a value that is slightly larger than the Vo (off) of Vo (on) again.The method of asking of the value of Vo (on) is generally, and decision LED serial 202 has several light emitting diodes, pairing DC voltage DC when trying to achieve LED serial 202 conductings then (also being Vo (on)) earlier.And the value of Vo (off) can be tried to achieve via (formula one), that is via the ratio of adjusting the second impedance R2 and the first resistance R1, and the value of Vref obtains.
Now lift an example explanation.Suppose that working as the DC current I ' that exports LED serial 202 to is 300mA, DC voltage DC this moment (also being Vo (on)) is 79V, and therefore establishing the voltage (also be Vo (off)) of DC voltage DC when switch 204 ends is 80V.Suppose that Vref is 2.5V, and the first impedance R1 and the second impedance R2 are resistance.Therefore, the ratio between R1 and R2 be can try to achieve, and R2=6.45K, R1=200K selected by (formula one).So under the forward biased situation of diode D, the first reference voltage V1 " be 3.2V (Vref+VD_drop=2.5V+0.7V), so DC current I '=3.2V/Rs+ID=300mA.And in the case, the electric current of R2 of flowing through is 2.5V/6.45K=ID+ (Vo (on)-2.5)/200K, thus via 200K*ID+79=80, with ID=0.005mA, and substitution DC current I ' is in the 300mA=3.2V/Rs+0.005 formula, so Rs is 10.67 ohm.So in order to keep diode D forward bias, ratio between the necessary design first impedance R1 and the first impedance R2 and the size of resistance R s make the voltage Vo (off) of DC voltage DC when switch 204 ends greater than Vo (on)=79V.And this moment electric current I D much smaller than the electric current I o of the Rs that flows through, the therefore first reference voltage V1 " size still control by resistance R s.
Above-mentioned feedback circuit 206 also can be as the practice of second embodiment, can be via an amplifier 216, bridge between the anode of first end of current-voltage converter 214 and diode D, make the value of resistance R s can select less resistance value, reduce the power attenuation of resistance R s.
In addition, DC-to-DC converter 208 among these three embodiment also can be replaced by other buck converter, boosting type converter (Boost converter), liter-step-down controller (Boost-Buckconverter), flyback converter (Flyback converter) or full-bridge converter (Full-Bridge converter), similarly can be so that LED serial 202 can extinguish fast and light.The circuit diagram of the drive unit of the LED serial of use boosting type converter, liter-step-down controller, flyback converter, full-bridge converter is respectively shown in Fig. 5-8.
The drive unit of the disclosed LED serial of the above embodiment of the present invention, can realize making LED serial to light fast or extinguish purpose, and have and make LED serial after lighting, the DC current of LED serial of flowing through can be kept stable, so that the brightness of LED serial keeps necessarily, can be because of the characteristic of LED serial the different and advantage of difference to some extent.
In sum; though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can carry out various changes and modification, so protection scope of the present invention is as the criterion when looking the claim restricted portion that is proposed.

Claims (16)

1. the drive unit of a LED serial comprises:
One DC-to-DC converter, have one first DC-to-DC converter end and one second DC-to-DC converter end, this second DC-to-DC converter end is connected to a fixed voltage, and this DC-to-DC converter and foundation one feedback signal are exported a direct current voltage in this first DC-to-DC converter end;
One LED serial is connected to this first DC-to-DC converter end;
One switch is connected with this LED serial, and when this switch conduction, this LED serial is driven by this DC voltage, a direct current electric current this LED serial of flowing through; And
One feedback circuit is exported this feedback signal according to this DC current;
Wherein, when this switch conduction, this LED serial is lighted rapidly to a predetermined luminance, and when this switch ended, this LED serial extinguished rapidly.
2. device as claimed in claim 1, wherein this LED serial comprises that a light emitting diode or a plurality of this light emitting diode connect in the mode of connecting.
3. device as claimed in claim 1, wherein this feedback circuit comprises:
One current-voltage converter, have one first end and one second end, this first end is connected with this switch, this second end connects this second DC-to-DC converter end, when this switch conduction, this DC current flows into this current-voltage converter, makes this current-voltage converter produce one first reference voltage with as this feedback signal according to this DC current.
4. device as claimed in claim 3, wherein this DC-to-DC converter comprises:
One pulse-width modulator is adjusted the output signal of this pulse-width modulator according to this feedback signal, so that this stable DC voltage of this DC-to-DC converter output.
5. device as claimed in claim 4, wherein this current-voltage converter is a resistance, one end of this resistance is this first end, the other end of this resistance is one second end, after this DC current flows through this resistance, produce this first reference voltage and feed back to this pulse-width modulator in this first end.
6. device as claimed in claim 5, wherein the drive unit of this LED serial also comprises:
One amplifier bridges at first end and this pulse-width modulator of this current-voltage converter, and in order to this feedback signal is amplified to export this pulse-width modulator to.
7. device as claimed in claim 1, wherein this DC-to-DC converter has a pulse-width modulator, this pulse-width modulator is adjusted the output signal of this pulse-width modulator according to this feedback signal, so that this stable DC voltage of this DC-to-DC converter output, this feedback circuit comprises:
One current-voltage converter, have one first end and one second end, this first end is connected with this switch, this second end connects this second DC-to-DC converter end, when this switch conduction, this DC current flows into this current-voltage converter, makes this current-voltage converter produce one first reference voltage with as this feedback signal according to this DC current;
One voltage feedback circuit, in when this switch by the time, produce one second reference voltage with as this feedback signal according to this DC voltage, this voltage feedback circuit comprises:
One first impedance has one first impedance, first end and one first impedance, second end, and this first impedance, first end connects this DC voltage, and this first impedance, second end connects a node, and this node is connected to this pulse-width modulator;
One second impedance, an end of this second impedance connects this node, and the other end of this second impedance connects this fixed voltage, and the voltage of this node is as this second reference voltage; And
One diode, the negative terminal of this diode (N end) connects this node, and the anode of this diode (P end) is connected to this first end of this current-voltage converter;
Wherein, when this switch conduction, this first reference voltage by with diode current flow determining this second reference voltage, this feedback circuit with this second reference voltage as this feedback signal;
Wherein, when this switch by the time, this diode also ends, this moment second reference voltage decide by the dividing potential drop of this DC voltage by first impedance and second impedance, this feedback circuit with this second reference voltage as this feedback signal.
8. device as claimed in claim 7, wherein this current-voltage converter is a resistance, one end of this resistance is this first end, the other end of this resistance is this second end, after this DC current flows through this resistance, produce this first reference voltage and connect this pulse-width modulator via this diode in this first end.
9. device as claimed in claim 8, wherein the drive unit of this LED serial also comprises:
One amplifier bridges at first end of this current-voltage converter and the anode of this diode, and in order to this feedback signal is amplified to export this pulse-width modulator to.
10. device as claimed in claim 1, wherein this fixed voltage is a ground voltage.
11. device as claimed in claim 1, wherein this DC-to-DC converter is a buck converter.
12. device as claimed in claim 1, wherein, this DC-to-DC converter is a boosting type converter.
13. device as claimed in claim 1, wherein, this DC-to-DC converter is one a liter-step-down controller.
14. device as claimed in claim 1, wherein, this DC-to-DC converter is a full-bridge converter.
15. device as claimed in claim 1, wherein, this DC-to-DC converter is a flyback converter.
16. device as claimed in claim 1, wherein the drive unit of this light emitting diode is used in the backlight module of a LCD.
CNB2004100566932A 2004-08-12 2004-08-12 Driving device for light-emitting diode serial Active CN100489949C (en)

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CN101600279A (en) * 2009-07-20 2009-12-09 普照光电科技股份有限公司 The drive circuit of light-emitting diode
WO2010117500A2 (en) 2009-03-31 2010-10-14 Osram Sylvania Inc. Current source to drive a light source in an optical sensor system
WO2013033916A1 (en) * 2011-09-06 2013-03-14 深圳市华星光电技术有限公司 Led drive circuit, drive method, and liquid crystal display device
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WO2014121661A1 (en) * 2013-02-08 2014-08-14 东林科技股份有限公司 Dimmable light-emitting diode illumination system
CN104684171A (en) * 2013-12-02 2015-06-03 神讯电脑(昆山)有限公司 Drive circuit and drive method for light-emitting diode
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