CN1766963A - Parallel-connected type light-emitting diode driving device - Google Patents
Parallel-connected type light-emitting diode driving device Download PDFInfo
- Publication number
- CN1766963A CN1766963A CN 200410087939 CN200410087939A CN1766963A CN 1766963 A CN1766963 A CN 1766963A CN 200410087939 CN200410087939 CN 200410087939 CN 200410087939 A CN200410087939 A CN 200410087939A CN 1766963 A CN1766963 A CN 1766963A
- Authority
- CN
- China
- Prior art keywords
- emitting diode
- group
- parallel
- light emitting
- light
- 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)
Abstract
The invention relates to a parallel light-emitting diode driver which comprises a switch, a power and a plurality of groups of light-emitting diode units, wherein it uses the switch to parallel the plurality of groups of light-emitting diode units so that the power can provide the electricity to the light-emitting diode.
Description
Technical field
The invention relates to a kind of light emitting diode drive device, refer to a kind of dynamical parallel-connected type light-emitting diode driving device especially.
Background technology
Presentation Function personal digital assistant (PDA), mobile phone (Cell Phone), digital still camera, take the photograph products such as video recorder in, all be crucial, these products all have a large amount of use white light-emitting diodes (White LED) and ruddiness, green glow, blue light diode (Color R-RED mostly, G-Green, B-B1L1e LED), so the making of these light emitting diodes for above-mentioned numerical digit product, all is crucial.
Present stage has many product needed to use dissimilar light emitting diode combined especially, for example red diodes is that 1.9 volts, green glow and blue light diode are 3.7 volts, its quantitative combination just has many kinds, generally needs whether control numerous lumination of light emitting diode with the driving circuit of a complexity.Existing driving circuit be with no matter the light emitting diode number in the circuit what, and required voltage power, give a big magnitude of voltage without exception, but this can cause serious power loss, Fig. 1 is existing parallel-connected type light-emitting diode driving device synoptic diagram, wherein, supply unit 10 (as a battery) provides a voltage to driving circuit 11, the output of this driving circuit offers three light emitting diodes 12 respectively, 13, and 14, and above-mentioned diode 12,13,14 need the driving voltage of different sizes respectively, but generally all be to give a maximum voltage value, diode 14 has three light emitting diodes, so this circuit promptly gives 10 volts voltage to diode 14 and the less diode 12 of number of diodes, 13, so a large amount of power attenuations is just arranged at above-mentioned diode 12,13.
Summary of the invention
The invention provides a kind of parallel-connected type light-emitting diode (LED) drive unit, include: many groups light emitting diode, a supply unit and switchgear in parallel; Above-mentioned each group light emitting diode in parallel all includes the light emitting diode of at least one serial connection, and pass through by switchgear above-mentioned multi-group light-emitting diode optionally in parallel unit, supply unit then is to the power supply of above-mentioned multi-group light-emitting diode unit, therefore can reach any purpose that drives multi-group light-emitting diode in parallel.
Above-mentioned diode driving more comprises an adaptive voltage controller, be in the light emitting diode according to conducting, light emitting diode number and kind that each light emitting diode was connected in series, control the voltage that above-mentioned supply unit provides, to avoid unnecessary power dissipation, reach dynamical purpose.
Description of drawings
Fig. 1 is existing parallel-connected type light-emitting diode driving device synoptic diagram;
Fig. 2 is the synoptic diagram of a preferred embodiment of the present invention;
Fig. 3 is the system architecture diagram of a preferred embodiment of the present invention.
Embodiment
For more understanding technology contents of the present invention, be described as follows especially exemplified by a preferred embodiment.
Fig. 2 is the synoptic diagram of a preferred embodiment of the present invention, is three groups of light emitting diodes 22,23., 24 in parallel in this example, but should be as limit, also can and di-group, four groups even multi-group light-emitting diode unit more.Among Fig. 2, this example is a parallel-connected type light-emitting diode driving device, comprise three groups of light emitting diodes 22,23,24, it is by a supply unit 20 power supplies, and be connected to selector switch 21 respectively, this switchgear 21 is whether to switch above-mentioned three groups of light emitting diodes, 22,23,24 conductings respectively according to one group of control signal 200 of input.
Fig. 3 is the system architecture diagram of a preferred embodiment of the present invention, in the drawings, light emitting diode 22 comprises the light emitting diode 25 of two serial connections, the light emitting diode 25 that light emitting diode 23 comprises three serial connections, the light emitting diode 25 that light emitting diode 24 comprises four serial connections, the negative terminal of above-mentioned three groups of light emitting diodes 22,23,24 is to be electrically connected to switch 32,33 in the switchgear 21, and 34 respectively, and the conducting over the ground respectively by 200 controls of one group of control signal.Select circuit 31 to be electrically connected to the negative terminal of three groups of light emitting diodes 22,23,24 respectively, capturing its voltage quasi position V22, V23, V24, and export its be minimal to comparer 35 and with a reference voltage VI relatively, and then export one and switch voltage Vc.
Because three groups of light emitting diodes 22,23,24 required forward voltage are not necessarily identical, so voltage quasi position V22 of its negative terminal, V23, V24 also not necessarily can be identical, for example: import one group of control signal 200 and make the light emitting diode 22 and 23 can be via switch 32 and 33 conducting and luminous over the ground, suppose the forward voltage of the forward voltage of light emitting diode 22 less than light emitting diode 23, then the voltage quasi position V22 when circuit turn-on can be greater than V23, comparer 35 capture again less (V23) and with reference voltage VI, and export a switching voltage Vc to adaptive voltage controller 400, this adaptive voltage controller 400 is adjusted according to switched voltage Vc and is exported light emitting diode 22 to, 23, the voltage of 24 anodes.
In this example, adaptive voltage controller 400 is made up of inductor 41, electric crystal 40, Schottky diode 42 and electric capacity 43, this inductor 41 is used as one energy storage/exoergic device, electric crystal 40 forms one with 42 of Schottky diodes and switches switch, when electric crystal 40 presents Guan Lushi, 42 of Schottky diodes are regarded as opening circuit, and supply unit 20 will charge to inductor 41; Otherwise when electric crystal 40 open circuits, Schottky diode 42 is regarded as path; So the switched voltage Vc that feedbacks according to comparer 35 gives electric crystal 40 and together controls its cycle time with Schottky diode 42, adjusts the magnitude of voltage that adaptive voltage controller 400 is exported by this.
Moreover, because one of them opens switch 32,33,34, cause light emitting diode 22,23,24 wherein have can't conducting in, voltage quasi position V22, the V23 of diode 22,23,24 its negative terminals of conducting, V24 just can't not confirm in high-voltage state yet, so need connect a current-source arrangement 36 so that the mode of electric current to be provided at the negative terminal of light emitting diode 22,23,24, diode 22,23,24 negative terminals of not conducting are maintained the accurate position of high voltage; Three independently current sources 37,38, and 39 are arranged in the current-source arrangement 36 in this example.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that claim is described certainly, but not only limits to the foregoing description.
Claims (10)
1. parallel-connected type light-emitting diode driving device is characterized in that comprising:
Many groups light emitting diode in parallel, each group light emitting diode is the light emitting diode that includes at least one serial connection;
One supply unit, in order to provide power supply to this light emitting diode: and
One switchgear is connected in this multi-group light-emitting diode unit, to pass through by switching this switchgear optionally this multi-group light-emitting diode unit of conducting, makes this supply unit to this at least one group of light emitting diode power supply.
2. parallel-connected type light-emitting diode driving device as claimed in claim 2 is characterized in that, described this switchgear is to switch by one group of control signal driving.
3. parallel-connected type light-emitting diode driving device as claimed in claim 2, it is characterized in that, described this switchgear is made up of a plurality of switch, and these a plurality of switches are connected to this multi-group light-emitting diode unit, so that this at least one group of light emitting diode of conducting optionally.
4. parallel-connected type light-emitting diode driving device as claimed in claim 2 is characterized in that, described this group control signal is to be one group of PWM pulse wave, and it comprises the information of this at least one group of light emitting diode switching time and fluorescent lifetime length.
5. parallel-connected type light-emitting diode driving device as claimed in claim 2, it is characterized in that, more comprise an adaptive voltage controller, in this at least one group of light emitting diode with the foundation conducting, light emitting diode number and kind that each light emitting diode was connected in series are controlled power source voltage that this supply unit provides.
6. parallel-connected type light-emitting diode driving device as claimed in claim 5 is characterized in that, described this adaptive voltage controller is that any switch in these three switches switches simultaneously, changes the power supply to this at least one group of light emitting diode.
7. parallel-connected type light-emitting diode driving device as claimed in claim 5, it is characterized in that, described this adaptive voltage controller is made up of an inductor, an electric crystal and a diode and an electric capacity, wherein this inductor is to be one energy storage/exoergic device, this electric crystal and this diode are energy storage or the exoergics in order to switch this inductor, and, change the voltage that this at least one group of light emitting diode is provided with the ratio of this inductor energy storage or exoergic time.
8. parallel-connected type light-emitting diode driving device as claimed in claim 7 is characterized in that, described this diode is to be a Schottky diode.
9. parallel-connected type light-emitting diode driving device as claimed in claim 7, it is characterized in that, more comprise a comparer, a selection circuit and a current-source arrangement, this selection circuit is to be electrically connected this current-source arrangement and this a plurality of switches respectively, so that the minimum voltage in the time of can selecting this at least one group of light emitting diode conducting is to export this comparer to, this comparer is relatively this minimum voltage and a reference voltage and provide one to switch voltage and switch to above-mentioned this electric crystal, with the optimum value of the output voltage of adjusting this adaptive voltage controller control.
10. parallel-connected type light-emitting diode driving device as claimed in claim 9, it is characterized in that, described this current-source arrangement is that at least one switch in these a plurality of switches switches to when opening circuit, and provides at least one high voltage, so that make this selection circuit correctly select this minimum voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410087939 CN1766963A (en) | 2004-10-27 | 2004-10-27 | Parallel-connected type light-emitting diode driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410087939 CN1766963A (en) | 2004-10-27 | 2004-10-27 | Parallel-connected type light-emitting diode driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1766963A true CN1766963A (en) | 2006-05-03 |
Family
ID=36742819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410087939 Pending CN1766963A (en) | 2004-10-27 | 2004-10-27 | Parallel-connected type light-emitting diode driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1766963A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101998725A (en) * | 2009-08-24 | 2011-03-30 | 华映视讯（吴江）有限公司 | Drive circuit of light-emitting diode |
| CN102014544A (en) * | 2010-07-13 | 2011-04-13 | 深圳市航嘉驰源电气股份有限公司 | LED (Light-Emitting Diode) lamp driving circuit |
| WO2011072485A1 (en) * | 2009-12-17 | 2011-06-23 | 宇威光电股份有限公司 | Light emitting device |
| CN103369762A (en) * | 2012-03-29 | 2013-10-23 | 钰瀚科技股份有限公司 | Driving method of lighting equipment based on light emitting diode and device thereof |
| TWI420448B (en) * | 2009-03-09 | 2013-12-21 | Innolux Corp | Led backlight module, a driving method thereof, and a display thereof |
| CN101990337B (en) * | 2009-08-03 | 2014-03-26 | 联咏科技股份有限公司 | Light source drive device capable of dynamically maintaining constant current drive and related method thereof |
| WO2014100919A1 (en) * | 2012-12-28 | 2014-07-03 | 钰瀚科技股份有限公司 | Device with general structure for driving multiple light-emitting diode strings |
-
2004
- 2004-10-27 CN CN 200410087939 patent/CN1766963A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI420448B (en) * | 2009-03-09 | 2013-12-21 | Innolux Corp | Led backlight module, a driving method thereof, and a display thereof |
| CN101990337B (en) * | 2009-08-03 | 2014-03-26 | 联咏科技股份有限公司 | Light source drive device capable of dynamically maintaining constant current drive and related method thereof |
| CN101998725A (en) * | 2009-08-24 | 2011-03-30 | 华映视讯（吴江）有限公司 | Drive circuit of light-emitting diode |
| WO2011072485A1 (en) * | 2009-12-17 | 2011-06-23 | 宇威光电股份有限公司 | Light emitting device |
| CN102102814B (en) * | 2009-12-17 | 2012-09-05 | 宇威光电股份有限公司 | Luminous device |
| CN102014544A (en) * | 2010-07-13 | 2011-04-13 | 深圳市航嘉驰源电气股份有限公司 | LED (Light-Emitting Diode) lamp driving circuit |
| CN103369762A (en) * | 2012-03-29 | 2013-10-23 | 钰瀚科技股份有限公司 | Driving method of lighting equipment based on light emitting diode and device thereof |
| CN103369762B (en) * | 2012-03-29 | 2015-06-17 | 钰瀚科技股份有限公司 | Driving method of lighting equipment based on light emitting diode and device thereof |
| WO2014100919A1 (en) * | 2012-12-28 | 2014-07-03 | 钰瀚科技股份有限公司 | Device with general structure for driving multiple light-emitting diode strings |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103118455B (en) | LED current controls | |
| US8773087B2 (en) | Power supply circuit having switched capacitor units | |
| US7649326B2 (en) | Highly efficient series string LED driver with individual LED control | |
| US20080258636A1 (en) | Led driver with current sink control and applications of the same g | |
| EP1964447B1 (en) | Circuit-arrangement for modulating an led and method for operating same | |
| CA2459968A1 (en) | Power efficient led driver quiescent current limiting circuit configuration | |
| US8159148B2 (en) | Light emitting diode light source module | |
| CN107493635A (en) | A kind of more pixel drive systems of LED | |
| CN102254526B (en) | Light-emitting element driving device and display device | |
| CN101833929A (en) | Single-string LED lamp tube push-pull type direct-current high-voltage drive circuit of liquid-crystal display | |
| US11576241B2 (en) | LED apparatus with integrated power supply and a method of employing same | |
| KR101490332B1 (en) | Driving Method and Apparatus for Direct AC LED | |
| CN201757975U (en) | Push-pull DC high-voltage driving circuit for liquid crystal display single-tandem LED lamp | |
| CN217741948U (en) | LED lamp and dimming driving device for LED brightness | |
| CN114420063B (en) | Driving method of LED backlight driving circuit based on low-potential end switch control | |
| CN1766963A (en) | Parallel-connected type light-emitting diode driving device | |
| CN210325157U (en) | Backlight driving circuit, backlight driving device and display device | |
| CN101771404A (en) | LED control chip | |
| CN1716350A (en) | Driving device for serial red, green and blue light emitting diodes | |
| CN101256292B (en) | Backlight module with variable lightness and brightness control method | |
| CN207321594U (en) | A kind of more pixel drive systems of LED | |
| CN101996588B (en) | Backlight module and driving circuit | |
| CN214381497U (en) | Digital LED module capable of being randomly connected in series and parallel | |
| CN100562911C (en) | LED drive and use its display device | |
| TWI314718B (en) |
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 |