CN102685967A - Light-emitting diode (LED) driving circuit - Google Patents
Light-emitting diode (LED) driving circuit Download PDFInfo
- Publication number
- CN102685967A CN102685967A CN2011100580338A CN201110058033A CN102685967A CN 102685967 A CN102685967 A CN 102685967A CN 2011100580338 A CN2011100580338 A CN 2011100580338A CN 201110058033 A CN201110058033 A CN 201110058033A CN 102685967 A CN102685967 A CN 102685967A
- Authority
- CN
- China
- Prior art keywords
- led
- electrode
- drive circuit
- circuit
- semiconductor switch
- 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
Links
Images
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a light-emitting diode (LED) driving circuit which is provided with a input end and an output end; the input end is connected with a power supply; the output end is connected with an LED; the LED driving circuit mainly comprises a fixed current module, a semi-conductor switch and a bias circuit which is connected with the semi-conductor switch; the bias circuit comprises a first resistor and a first Zener diode which is connected with the first resistor; the semi-conductor switch is provided with three electrodes, wherein a first electrode is connected with a junction between the first resistor and the first Zener diode, a second electrode is connected with one end of the fixed current module, and a third electrode and the other end of the first resistor form the output end; and the other end of the first Zener diode and the other end of the fixed current module form the input end together with the other end of the first resistor. The LED driving circuit can be directly connected with utility power to drive the LED for lighting, and the LED is only in two states, i.e. being off and on at constant current; and the voltage rising and falling time on both ends of the LED is very short, so that the impact on a chip is very small.
Description
Technical field
The present invention relates to a kind of drive circuit, especially a kind of led drive circuit.
Background technology
Along with the development of LED technology, LED has been increasing to be applied to various fields.Because of LED is a DC driven; So often applied environments that are applied to DC driven of LED more; Such as battery-powered electronic products such as mobile phones; Be provided with the special power converting circuit device electronic product of (generally claiming power supply adaptor) such as computer etc. again, but in the time will LED being applied to lighting field, then need thinking again.
LED can directly connect the electric main of 220V unlike common incandescent lamp bulb, and LED is that the low-voltage direct of 2～3V drives, and will consider to satisfy the requirement of illumination, translation circuit that then must complex design.Because the LED responsive semiconductor device that is characteristic has negative temperature characteristic again, thereby need guarantee that in application process it is in stable operating state, thus the LED device to the requirement of driving power near harshness.
Existing led drive circuit generally all can use the device that electric main is converted to direct current, like bridge rectifier, and adds and to decide the electric current assembly, works in stable electric current to guarantee LED.Because of electric main comes down to continuous sine wave, after the bridge rectifier conversion, become continuous half-sine wave; So voltage is rising repeatedly and the decline that is continuing not stop; This rising and decline meeting cause damage to LED, reduce LED efficient, even the useful life of LED.In order to obtain the less direct current of change in voltage amplitude, can carry out filtering at electric capacity of two output parallel connections of bridge rectifier.But because the life-span of electric capacity is generally short a lot of than the life-span of LED, this can cause shortening the useful life of whole LED drive circuit.And, still have the rising repeatedly and the decline that continue not stop on the direct current of output through behind the capacitor filtering, and the amplitude that just changes is less, and this also can impact to chip, influences the life-span of chip.
In view of the difficult problem of traditional direct-current LED aspect driving power, so derive AC LED.
AC LED is one type of integrated LED product of various treatment technologies, and it comprises multiple device or kernel, need not extra transformer, rectifier or drive circuit, and the alternating current of AC network just can directly drive it.This makes the LED product can directly apply to household and office's ac electric apparatus plug, is not only showing the reduction circuit cost, has also avoided the energy loss in the power conversion process.AC LED can be matched to civil power, so AC LED can be applied to general lighting, billboard, street lamp and household electrical appliance.The voltage when but AC LED drives is the state that is in change, can produce bright dark variation, also is a challenge for reliability.
Under the situation that AC LED all can't effectively improve because of efficient, yield, reliability, produced high-voltage LED again.When high-voltage LED drives at civil power, also can be excessive because of voltage, electric current amplitude of fluctuation, cause the decline of efficient and the inefficacy of chip.
Summary of the invention
The object of the present invention is to provide a kind of led drive circuit of the damage that can effectively protect variation that LED avoids power supply itself and LED is brought.
The object of the invention adopts following technical scheme to realize: a kind of led drive circuit; Have input and output; Said input links to each other with power supply; Said output links to each other with LED, and said power supply is offered LED and driving LED is lighted, and said led drive circuit mainly comprises the bias circuit of deciding current module, semiconductor switch and linking to each other with said semiconductor switch; Said bias circuit comprises first resistance and first Zener diode that links to each other with first resistance; Said semiconductor switch has three electrodes, and first electrode links to each other with the tie point of first resistance with first Zener diode, and second electrode links to each other with an end of deciding current module; The other end of third electrode and said first resistance constitutes output, the other end of said first Zener diode and the other end of decide current module together with the other end formation input of said first resistance.
Said semiconductor switch can be a FET, and said first electrode is a grid, and said second electrode is a source electrode, and said third electrode is drain electrode.
Saidly decide current module and comprise and decide the electric current assembly and decide second Zener diode that the electric current assembly is in parallel with said.
Said decide the current module two ends be parallel with electric capacity and with second resistance that is in series of said electric capacity.
The input of said led drive circuit also is provided with rectification circuit, links to each other with civil power.
Said rectification circuit is a bridge rectifier.
The LED that the output of said led drive circuit links to each other is a high-voltage LED.
Zener diode through selecting suitable specification with decide the electric current assembly, the current potential of semiconductor switch grid is than the current potential height of source electrode when making operate as normal.When the voltage at the first Zener diode two ends that are connected with the grid of semiconductor switch raise gradually and surpass collapse point, first Zener diode was in normal operating conditions.Because the grid of semiconductor switch is connected with first Zener diode, so the current potential of grid is identical with the current potential of the negative pole of first Zener diode, and constant.At this moment semiconductor switch conducting, and then drive and decide the electric current assembly and to work, driving LED is lighted, and the electric current that flows through LED is a constant current.When the voltage at the first Zener diode two ends was lower than collapse point, semiconductor switch was closed, and LED extinguishes.
FET is a kind of speed-sensitive switch assembly, and response speed is very fast.Through semiconductor switch with decide the cooperation of electric current assembly, LED only is in extinguish and under constant current, lights two states.The voltage rising and the fall time at LED two ends are very short, and is very little to the impact of chip.
The object of the invention more adopts following technical scheme to realize: a kind of led drive circuit; Be electrically connected between a power supply and the one or more LED; Light in order to said power supply offered said LED and to drive said LED; It is characterized in that: said led drive circuit mainly comprises the bias circuit that certain current module, semiconductor switch and link to each other with said semiconductor switch; Said bias circuit has tie point and one second end in one first end, the circuit; Said semiconductor switch has one first electrode, one second electrode and a third electrode, and tie point links to each other in the said circuit of the said bias circuit of said first electrode, and said second electrode links to each other with a said end of deciding current module; Said first end of said third electrode and said bias circuit is electrically connected at said LED respectively, and the other end that said second end of said bias circuit and said is decided current module is electrically connected at this power supply respectively with said first end of said bias circuit together.
Description of drawings
Fig. 1 is the led drive circuit figure of first embodiment of the invention.
Fig. 2 is the oscillogram that flows through the electric current of LED in the first embodiment of the invention.
Fig. 3 is the led drive circuit figure of second embodiment of the invention.
Embodiment
To combine accompanying drawing that the specific embodiment of the invention is done further to specify below.
First execution mode
See also as shown in Figure 1ly, the led drive circuit 10 of first execution mode of the present invention has input 11 and output 12.Input 11 comprises node A and B, and input 12 comprises node C and D.Said input 11 is electrically connected at a power supply, and said output 12 links to each other with LED, and said power supply is offered LED and driving LED is lighted.In this execution mode, said LED adopts a plurality of high-voltage LED series connection and/or parallel connection combination, forms led array.The specification of led array is represented with the magnitude of voltage at led array two ends.Said led drive circuit 10 mainly comprises the bias circuit 13 of deciding current module 14, semiconductor switch Q11 and linking to each other with said semiconductor switch Q11.Said bias circuit 13 comprises first resistance R 11 and the first Zener diode D12 that links to each other with first resistance R 11.Wherein, Bias circuit 13 has tie point and one second end in one first end, the circuit; First end is the upper end of first resistance R 11, and tie point is the tie point between first resistance R 11 and the one the first Zener diode D12 in the circuit, and second end is the lower end of the first Zener diode D12.Said semiconductor switch Q11 can be various 3 end semiconductor switching components such as FET, triode.FET has a source electrode (Source), a drain electrode (Drain) and a grid (Gate).Said grid links to each other with tie point between first resistance R 11 and the first Zener diode D12; Said source electrode links to each other with an end of deciding current module 14 (diagram upper end); The other end of said drain electrode and said first resistance R 11 (diagram upper end) constitutes output 12, the other end of the said first Zener diode D12 (diagram lower end) and the other end (diagram lower end) of decide current module 14 together with the other end (on the diagram) the formation input 11 of said first resistance R 11.Saidly decide that current module 14 is decided electric current assembly N11 by one and one second Zener diode D13 is formed in parallel, the second Zener diode D13 decides electric current assembly N11 in order to protect, and deciding electric current assembly N11 for example is that NU501 decides electric current I C.
The input 11 of said led drive circuit 10 is connected in rectification circuit D11, and in this execution mode, what said rectification circuit D11 adopted is bridge rectifier.Two inputs of rectification circuit D11 directly are connected to mains supply, and two outputs of rectification circuit D11 are electrically connected at node A and B respectively.Originally sinusoidal wave alternating current is behind over commutation, and forming has two just periodicity direct current outputs of half part in the one-period, offer drive circuit and use.Oscillogram after the rectification is shown in dotted line among Fig. 2 21.See also as shown in Figure 2ly, the waveform 22 among the figure shown in the solid line is the waveform of output among first embodiment.Though the drive circuit 10 of first embodiment of the invention can make LED only be in to be extinguished and under constant current, lights two states, the voltage at LED two ends rise and fall time very short, very little to the impact of chip.But the starting point (corresponding to each sinusoidal wave starting point of civil power) of lighting led state at every section constant current can produce peak voltage 20, also can cause certain impact to chip.
Through Zener diode and the resistance of selecting suitable specification, the current potential of semiconductor switch grid is higher than the current potential of source electrode when making operate as normal.When the voltage at the first Zener diode D12 two ends that the grid with semiconductor switch Q11 is connected raise gradually and surpass collapse point, the first Zener diode D12 was in normal operating conditions.Because the grid of semiconductor switch Q11 is connected with the first Zener diode D12, so the current potential of grid equals the current potential of the negative pole of the first Zener diode D12, and constant.At this moment semiconductor switch Q11 conducting, and then drive and decide electric current assembly N11 and to work, the electric current that flows through high-voltage LED is a constant current, the high-voltage LED array is lighted.When abrupt voltage wave (spike) or ripple (ripple) generation, semiconductor switch Q11 sponges unnecessary voltage, decides electric current assembly 14 and LED thereby can protect.When the voltage at the first Zener diode D12 two ends was lower than collapse point, semiconductor switch Q11 closed, and high-voltage LED extinguishes.It is 4 high-voltage LED connection in series-parallel compositions of 50V that the high-voltage LED array can adopt operating voltage.For example LED11 connects with LED13, and LED12 connects with LED14, and the LED parallel connection after will connecting then forms led array.Wherein, node C is electrically connected at the positive pole of led array, and node D is electrically connected at the negative pole of led array.
FET is a kind of speed-sensitive switch assembly, and response speed is very fast.Through semiconductor switch Q11 with decide the cooperation of electric current assembly 14, high-voltage LED only is in extinguish and under constant current, lights two states.The voltage rising and the fall time at high-voltage LED two ends are very short, and is very little to the impact of chip.The oscillogram of the electric current during high-voltage LED work is as shown in Figure 2.
Second execution mode
See also as shown in Figure 3ly, the led drive circuit 30 of second execution mode of the present invention has input 31 and output 32.Input 31 comprises node A and B, and input 32 comprises node C and D.Said input 31 is electrically connected at a power supply, and said output 32 links to each other with LED, and said power supply is offered LED and driving LED is lighted.In this execution mode, said LED adopts a plurality of high-voltage LED series connection and/or parallel connection combination, forms led array.The specification of led array is represented with the magnitude of voltage at led array two ends.Said led drive circuit 30 mainly comprises the bias circuit 33 of deciding current module 34, semiconductor switch Q31 and linking to each other with said semiconductor switch Q31.Said bias circuit 33 comprises first resistance R 31 and the first Zener diode D32 that links to each other with first resistance R 31.Wherein, Bias circuit 33 has tie point and one second end in one first end, the circuit; First end is the upper end of first resistance R 31, and tie point is the tie point between first resistance R 31 and the one the first Zener diode D32 in the circuit, and second end is the lower end of the first Zener diode D32.Said semiconductor switch Q31 can be various 3 end semiconductor switching components such as FET, triode.FET has a source electrode, a drain electrode and a grid.Said grid links to each other with tie point between first resistance R 31 and the first Zener diode D32; Said source electrode links to each other with an end of deciding current module 34 (diagram upper end); The other end of said drain electrode and said first resistance R 31 (diagram upper end) constitutes output 32, the other end of the said first Zener diode D32 (diagram lower end) and the other end (diagram lower end) of decide current module 34 together with the other end (on the diagram) the formation input 31 of said first resistance R 31.Saidly decide that current module 34 is decided electric current assembly N31 by one and one second Zener diode D33 is formed in parallel, the second Zener diode D33 decides electric current assembly N31 in order to protect, and deciding electric current assembly N31 for example is that NU501 decides electric current I C.
The input 31 of said led drive circuit 30 is connected in rectification circuit D31, and in this execution mode, what said rectification circuit D31 adopted is bridge rectifier.Two inputs of rectification circuit D31 directly are connected to mains supply, and two outputs of rectification circuit D31 are electrically connected at node A and B respectively.Originally sinusoidal wave alternating current is behind over commutation, and forming has two just periodicity direct current outputs of half part in the one-period, offer drive circuit and use.
Through Zener diode and the resistance of selecting suitable specification, the current potential of semiconductor switch grid is higher than the current potential of source electrode when making operate as normal.When the voltage at the first Zener diode D32 two ends that the grid with semiconductor switch Q31 is connected raise gradually and surpass collapse point, the first Zener diode D32 was in normal operating conditions.Because the grid of semiconductor switch Q31 is connected with the first Zener diode D32, so the current potential of grid equals the current potential of the negative pole of the first Zener diode D32, and constant.At this moment semiconductor switch Q31 conducting, and then drive and decide electric current assembly N31 and to work, the electric current that flows through high-voltage LED is a constant current, the high-voltage LED array is lighted.When abrupt voltage wave (spike) or ripple (ripple) generation, semiconductor switch Q31 sponges unnecessary voltage, decides electric current assembly 34 and LED thereby can protect.When the voltage at the first Zener diode D32 two ends was lower than collapse point, semiconductor switch Q31 closed, and high-voltage LED extinguishes.It is 4 high-voltage LED connection in series-parallel compositions of 50V that the high-voltage LED array can adopt operating voltage.For example LED 31 connects with LED 33, and LED 32 connects with LED 34, and the LED parallel connection after will connecting then forms led array.Wherein, node C is electrically connected at the positive pole of led array, and node D is electrically connected at the negative pole of led array.
As shown in Figure 3, the difference of second execution mode of the present invention and first execution mode mainly is, saidly decides second resistance R 32 that current module 34 two ends are parallel with capacitor C and are in series with said electric capacity.Because, see also as shown in Figure 2ly, the waveform among the figure shown in the solid line is the waveform of output among first embodiment.Though the drive circuit 10 of first embodiment of the invention can make LED only be in to be extinguished and under constant current, lights two states, the voltage at LED two ends rise and fall time very short, very little to the impact of chip.But the starting point (corresponding to each sinusoidal wave starting point of civil power) of lighting led state at every section constant current can produce peak voltage 20, also can cause certain impact to chip.So, with to decide electric current assembly N31 parallelly connected, can eliminate moment peak voltage 20 the influence that every section constant current is lighted led state with a capacitor C.
Certainly, with the present invention when use in country variant or area, because of city's electrical specification of each country standard different, so the resistance of collocation and the specification of Zener diode also should be done suitable adjustment.Also need be according to the specification of the different led array of different civil power Standard Selection.
Table one
Above embodiment is merely the present invention's two kinds of execution modes wherein, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. led drive circuit; Have an input and an output; Said input links to each other with a power supply; Said output links to each other with one or more LED, said power supply is offered said LED and drives said LED light, and it is characterized in that: said led drive circuit mainly comprises the bias circuit that certain current module, semiconductor switch and link to each other with said semiconductor switch; Said bias circuit comprises one first resistance and one first Zener diode that links to each other with said first resistance; Said semiconductor switch has one first electrode, one second electrode and a third electrode, and said first electrode links to each other with tie point between said first resistance and said first Zener diode, and said second electrode links to each other with a said end of deciding current module; The other end of said third electrode and said first resistance constitutes said output, and the other end that the other end of said first Zener diode and said is decided current module constitutes said input with the other end of said first resistance together.
2. led drive circuit as claimed in claim 1 is characterized in that: said semiconductor switch is a FET, and said first electrode is a grid, and said second electrode is a source electrode, and said third electrode is drain electrode.
3. led drive circuit as claimed in claim 1 is characterized in that: saidly decide current module and comprise certain electric current assembly and one and saidly decide second Zener diode that the electric current assembly is in parallel.
4. led drive circuit as claimed in claim 3 is characterized in that: saidly decide the current module two ends and be parallel with an electric capacity and one and second resistance that is in series of said electric capacity.
5. led drive circuit as claimed in claim 1 is characterized in that: the said input of said led drive circuit also is provided with rectification circuit, links to each other with civil power.
6. led drive circuit as claimed in claim 5 is characterized in that: said rectification circuit is a bridge rectifier.
7. led drive circuit as claimed in claim 1 is characterized in that: said LED adopts a plurality of high-voltage LED series connection and/or parallel connection combination.
8. led drive circuit as claimed in claim 1 is characterized in that: said decide the current module two ends be parallel with an electric capacity and one and second resistance that is in series of said electric capacity.
9. led drive circuit as claimed in claim 1 is characterized in that: when abrupt voltage wave or ripple generation, said semiconductor switch sponges unnecessary voltage, thereby can protect said decide electric current assembly and said LED.
10. led drive circuit; Be electrically connected between a power supply and the one or more LED; Light in order to said power supply offered said LED and to drive said LED; It is characterized in that: said led drive circuit mainly comprises the bias circuit that certain current module, semiconductor switch and link to each other with said semiconductor switch; Said bias circuit has tie point and one second end in one first end, the circuit; Said semiconductor switch has one first electrode, one second electrode and a third electrode, and tie point links to each other in the said circuit of the said bias circuit of said first electrode, and said second electrode links to each other with a said end of deciding current module; Said first end of said third electrode and said bias circuit is electrically connected at said LED respectively, and the other end that said second end of said bias circuit and said is decided current module is electrically connected at this power supply respectively with said first end of said bias circuit together.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100580338A CN102685967A (en) | 2011-03-11 | 2011-03-11 | Light-emitting diode (LED) driving circuit |
| TW100120194A TW201238396A (en) | 2011-03-11 | 2011-06-09 | Driving circuit for LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100580338A CN102685967A (en) | 2011-03-11 | 2011-03-11 | Light-emitting diode (LED) driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102685967A true CN102685967A (en) | 2012-09-19 |
Family
ID=46817148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100580338A Pending CN102685967A (en) | 2011-03-11 | 2011-03-11 | Light-emitting diode (LED) driving circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102685967A (en) |
| TW (1) | TW201238396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612578A (en) * | 2015-10-21 | 2017-05-03 | 香港商酷异有限公司 | Driving circuit capable of preventing electromagnetic interference |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6869140B2 (en) * | 2017-08-07 | 2021-05-12 | 株式会社 日立パワーデバイス | Semiconductor devices and alternators using them |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000260578A (en) * | 1999-03-10 | 2000-09-22 | Seiwa Electric Mfg Co Ltd | Led lighting circuit |
| CN2739914Y (en) * | 2004-06-25 | 2005-11-09 | 王亚军 | Superhigh brightness LED booster driving device |
| CN200980184Y (en) * | 2006-07-13 | 2007-11-21 | 黄光昌 | LED drive circuit |
| CN101646290A (en) * | 2008-08-06 | 2010-02-10 | 夏普株式会社 | Led drive circuit |
-
2011
- 2011-03-11 CN CN2011100580338A patent/CN102685967A/en active Pending
- 2011-06-09 TW TW100120194A patent/TW201238396A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000260578A (en) * | 1999-03-10 | 2000-09-22 | Seiwa Electric Mfg Co Ltd | Led lighting circuit |
| CN2739914Y (en) * | 2004-06-25 | 2005-11-09 | 王亚军 | Superhigh brightness LED booster driving device |
| CN200980184Y (en) * | 2006-07-13 | 2007-11-21 | 黄光昌 | LED drive circuit |
| CN101646290A (en) * | 2008-08-06 | 2010-02-10 | 夏普株式会社 | Led drive circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612578A (en) * | 2015-10-21 | 2017-05-03 | 香港商酷异有限公司 | Driving circuit capable of preventing electromagnetic interference |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201238396A (en) | 2012-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5720392B2 (en) | Light emitting diode drive device | |
| CN102932989B (en) | LED (Light Emitting Diode) driving device and driving method thereof | |
| JP2010272838A (en) | Ac light emitting diode circuit | |
| CN101657057A (en) | LED power circuit | |
| TW201110816A (en) | Lighting device with optical pulsation suppression by polyphase-driven electric energy | |
| CN103188845B (en) | The LED light emission device of alternating current Direct driver | |
| CN101711066B (en) | LED alternating current (AC) directly-powered circuit and power supply method | |
| CN104540271B (en) | A kind of self-adaptation type LED drive circuit | |
| CN201550315U (en) | LED driving circuit | |
| TWI401991B (en) | Power transformation apparatus between dc lighting element and ballast | |
| CN109980921B (en) | Switch constant current controller and switch constant current power supply driving circuit | |
| CN102510605B (en) | Novel LED (light emitting diode) driving circuit and drive method | |
| CN102469668B (en) | LED power supply circuit capable of being matched with electronic transformer | |
| CN102685967A (en) | Light-emitting diode (LED) driving circuit | |
| CN204350368U (en) | A kind of self-adaptation type LED drive circuit | |
| US20100283398A1 (en) | Driving device of lighting apparatus | |
| CN102811535A (en) | Ultrahigh-efficiency LED (Light-Emitting Diode) constant-current power supply based on single-stage conversion and controllable rectification | |
| CN103200729B (en) | Light emitting diode (LED) luminous device directly driven in constant current by alternating current | |
| CN201509348U (en) | LED power circuit | |
| CN101702858B (en) | LED power supply | |
| CN204350403U (en) | Ignition device and lighting device | |
| CN201976295U (en) | Lamp and power control circuit thereof | |
| CN202818729U (en) | LED driving device | |
| CN103687209A (en) | Alternating-current drive circuit of LED streetlight | |
| CN203560762U (en) | LED PAR lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120919 |