CN101616522B - Driving device for driving a luminous element - Google Patents
Driving device for driving a luminous element Download PDFInfo
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- CN101616522B CN101616522B CN200810131747A CN200810131747A CN101616522B CN 101616522 B CN101616522 B CN 101616522B CN 200810131747 A CN200810131747 A CN 200810131747A CN 200810131747 A CN200810131747 A CN 200810131747A CN 101616522 B CN101616522 B CN 101616522B
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- emitting component
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Abstract
The invention relates to a driving device for driving a luminous element, which comprises a power source supplier, a starting signal generator, a heat radiating signal generator, a multiplexer, a surge signal generator and a logic unit, wherein the power source supplier is used for generating a power source according to a control signal; the starting signal generator is used for generating a starting signal sequence according to the preset luminescence properties of the luminous element; the heat radiating signal generator is used for generating a heat radiating signal sequence; the multiplexer is coupled with the starting signal generator and the heat radiating signal generator and is used for synthesizing the starting signal sequence and the heat radiating signal sequence to generate a driving signal sequence; the surge signal generator is used for generating a surge signal according to the preset luminescence properties of the luminous element; and the logic unit is coupled with the multiplexer, the surge signal generator and the power source supplier and is used for outputting the driving signal sequence in time according to the surge signal to generate the control signal.
Description
Technical field
The present invention relates to a kind of drive unit that is used for driving a light-emitting component, especially relate to a kind of can effectively the heat radiation, improve the light decay problem of light-emitting component, further prolong the drive unit of the useful life of light-emitting component.
Background technology
In recent years, light emitting diode (Light Emitting Diode, constantly developed by application LED).Therefore be different from general incandescent lamp bulb, light emitting diode belongs to chemiluminescence, has that power consumption is low, component life long, need not warm up advantages such as lamp time and reaction velocity be fast.In addition,, vibration resistance little owing to the light-emitting diodes pipe volume, be fit to volume production, the fit applications demand can be made into the element of minimum or array easily, therefore generally be used on the pilot lamp and display device of information, communication and consumption electronic products.Light emitting diode is except being applied to outdoor various display and traffic lights; Be applied even more extensively on various portable product; Mobile phone and personal digital assistant (Personal DigitalAssistant for example; PDA) etc. screen backlight source, hot especially at present lcd products etc.
Light emitting diode has many advantages, but, on using, will reach the requirement that conforms to general lighting and also have very big distance, mainly contains a following difficult problem.
One, light decay (Light Degradation): so-called light decay refers to that under identical driving power along with the increase of running time, the brightness meeting of light emitting diode is constantly successively decreased, and its degree of successively decreasing, and is the most obvious when tentatively starting light emitting diode.That is to say that when first use light emitting diode, the degree of its descending luminance is the most obvious.Therefore, though the life-span of light emitting diode is long, when working long hours, light attenuation of light emitting diode adds that the situations such as deterioration of fluorescent powder and encapsulating material all can cause luminous flux to descend.When luminous flux dropped to a certain degree, " useful life " terminates of light emitting diode promptly can't reach the requirement of illumination or backlight application etc. so.
Two, the heating of light-emitting diode chip for backlight unit: although through the volume of finished product of LED after the encapsulation not very little, often less than 1 square millimeter, current density is big when working in this case on some product for the surface area of light-emitting diode chip for backlight unit; The diode internal heat generation is serious, if do not distribute heat, is easy to defective chip; Add in order to satisfy the requirement of illumination etc.; The intensive combination of a plurality of light emitting diodes, luminous for a long time, temperature rises more violent.In order to strengthen heat radiation, must strengthen area of dissipation, thereby increase the contour structures difficulty of design.
Summary of the invention
Therefore, fundamental purpose of the present invention promptly is to provide a kind of drive unit that is used for driving a light-emitting component.
The present invention discloses a kind of drive unit that is used for driving a light-emitting component, includes a power supply unit, is used for according to a control signal, produces power supply to this light-emitting component; One enabling signal generator is used for preset luminescence properties according to this light-emitting component, produces an enabling signal sequence, and each enabling signal of this enabling signal sequence has a period 1; One heat radiating signal generator is used for producing a heat radiating signal sequence, and each heat radiation signal of this heat radiating signal sequence has a second round; One multiplexer; Be coupled to this enabling signal generator and this heat radiating signal generator; Be used for synthesizing this enabling signal sequence and this heat radiating signal sequence; To produce a drive signal sequence, each drive signal of this drive signal sequence has a period 3, this period 3 be this period 1 and this second round sum; One surge signal generator is used for preset luminescence properties according to this light-emitting component, produces a surge signal, and this surge signal has a period 4, and this period 4 is greater than this period 3; And a logical block, be coupled to this multiplexer, this surge signal generator and this power supply unit, be used for exporting this drive signal sequence, to produce this control signal according to this surge signal in good time.
Description of drawings
Fig. 1 is the synoptic diagram of the embodiment of the invention one drive unit.
Fig. 2 is the synoptic diagram that concerns of control signal among Fig. 1, drive signal sequence, enabling signal and heat radiation signal.
The reference numeral explanation
10 drive units
100 power supply units
102 enabling signal generators
104 heat radiating signal generator
106 multiplexers
108 surge signal generator
110 logical blocks
The VIN input voltage
The VOUT output voltage
ACT_Seq enabling signal sequence
The ACT enabling signal
The HT_Seq heat radiating signal sequence
The HT signal that dispels the heat
The DRV_Seq drive signal sequence
The DRV drive signal
The V_BST surge signal
The V_CTR control signal
ACT_CCL, HT_CCL, DRV_CCL, BST_CCL cycle
Embodiment
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of the embodiment of the invention one drive unit 10.Drive unit 10 is used for driving a light-emitting component, and this light-emitting component preferably is a light emitting diode.Drive unit 10 includes a power supply unit 100, an enabling signal generator 102, a heat radiating signal generator 104, a multiplexer 106, a surge signal generator 108 and a logical block 110.Power supply unit 100 is used for receiving an input voltage VIN, and produces an output voltage VO UT to light-emitting component.Enabling signal generator 102 is used for according to the preset luminescence properties of light-emitting component, produces an enabling signal sequence A CT_Seq, to start power supply unit 100 out-put supplies.Enabling signal sequence A CT_Seq is made up of a plurality of enabling signal ACT, and the cycle of each enabling signal ACT is ACT_CCL.Heat radiating signal generator 104 is used for producing a heat radiating signal sequence HT_Seq, to control not out-put supply of power supply unit 100, makes light-emitting component to dispel the heat.Heat radiating signal sequence HT_Seq is made up of a plurality of heat radiation signal HT, and the cycle of each heat radiation signal HT is HT_CCL.Multiplexer 106 is coupled to enabling signal generator 102 and heat radiating signal generator 104; Be used for synthesizing enabling signal sequence A CT_Seq and heat radiating signal sequence HT_Seq; To produce a drive signal sequence DRV_Seq; Drive signal sequence DRV_Seq is made up of a plurality of drive signal DRV, and each drive signal DRV then is made up of an enabling signal ACT and a heat radiation signal HT.In other words, the one-period DRV_CCL of drive signal DRV is cycle ACT_CCL and cycle H T_CCL sum.Surge signal generator 108 is used for according to the preset luminescence properties of light-emitting component, produces a surge signal V_BST, and the cycle BST_CCL of surge signal V_BST is greater than cycle DRV_CCL.Logical block 110 is coupled to multiplexer 106, surge signal generator 108 and power supply unit 100; Be used for according to surge signal V_BST; In good time input drive signal sequence D RV_Seq; Give power supply unit 100 to produce a control signal V_CTR, thus the power supply size of the light-emitting component of control power supply unit 100 outputs, cycle etc.
About the detailed operation situation of drive unit 10, please continue with reference to figure 2, Fig. 2 is the synoptic diagram that concerns of control signal V_CTR among Fig. 1, drive signal sequence DRV_Seq, enabling signal ACT and heat radiation signal HT.Can know by Fig. 2; Surge signal V_BST is used for controlling and driving burst DRV_Seq output; That is during cycle BST_CCL; Logical block 110 can export drive signal sequence DRV_Seq to power supply unit 100, and during non-periodic BST_CCL, does not then export signal or export a low level signal to power supply unit 100.Thus; During cycle BST_CCL; Power supply unit 100 can be exported suitable power supply to light-emitting component according to level and the cycle ACT_CCL of enabling signal ACT among each drive signal DRV, and at the cycle H T_CCL of signal HT that dispels the heat; Then out-put supply does not dispel the heat in order to light-emitting component to light-emitting component.Wherein, the present invention is according to the preset luminescence properties of light-emitting component, and like brightness and chroma, the level of adjustment cycle ACT_CCL, HT_CCL, BST_CCL and enabling signal ACT is to reach preset effect.Certainly, also can logical block 110 be designed to during cycle BST_CCL, not export signal or export a low level signal to power supply unit 100, and during non-periodic BST_CCL, then export drive signal sequence DRV_Seq to power supply unit 100.Under this situation; Non-periodic BST_CCL during; Power supply unit 100 can be exported suitable power supply to light-emitting component according to level and the cycle ACT_CCL of enabling signal ACT among each drive signal DRV, and at the cycle H T_CCL of signal HT that dispels the heat; Then out-put supply does not dispel the heat in order to light-emitting component to light-emitting component.
Know like those skilled in the art, the property class of human eye is similar to a low-pass filter, that is more insensitive for brightness or the fast-changing situation of chroma.The present invention utilizes this characteristic, and will dispel the heat signal HT and enabling signal ACT alternately occur.When enabling signal ACT occurs, power supply unit 100 output driving powers, light-emitting component sends light source; And when heat radiation signal HT occurred, power supply unit 100 was not exported driving power, and light-emitting component does not send light source, to dispel the heat.Under this situation, because human eye can't be discovered brightness or the fast-changing situation of chroma, therefore as far as human eye, the brightness of the light source that light-emitting component is exported and chroma are constant for stablizing.In other words, added brightness and the chroma that heat radiation signal HT can not influence the light source that light-emitting component exports; The more important thing is that through heat radiation signal HT, light-emitting component because the time of light-emitting component continuous operations has shortened, thereby can improve the light decay problem of light-emitting component except can effectively dispelling the heat, further prolong " useful life " of light-emitting component.
What need pay special attention to is, Fig. 1 and Fig. 2 be in order to explanation the present invention, and those skilled in the art be when can doing different variations or modification according to this, and is not limited thereto.For instance; Power supply unit is not limited to the power supply unit of particular types; It can be a Current Control (Current Controlled) power supply unit, like boost type (Boost), buck (Buck), step-down/up type (Boost-buck) or falling-rising pressure type (Buck-boost) Current Control power supply unit.
In sum, will dispel the heat signal HT and enabling signal ACT of the present invention alternately comes across among the drive signal sequence DRV_Seq, makes that power supply unit 100 was not exported driving power, dispels the heat in order to light-emitting component when heat radiation signal HT occurred.Because human eye can't discover brightness or the fast-changing situation of chroma, so the present invention can not influence the brightness and the chroma of the light source that light-emitting component exports.The more important thing is that through heat radiation signal HT, light-emitting component because the time of light-emitting component continuous operations has shortened, thereby can improve the light decay problem of light-emitting component except can effectively dispelling the heat, further prolong " useful life " of light-emitting component.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (12)
1. drive unit that is used for driving a light-emitting component includes:
One power supply unit is used for according to a control signal, produces power supply to this light-emitting component;
One enabling signal generator is used for preset luminescence properties according to this light-emitting component, produces an enabling signal sequence, and each enabling signal of this enabling signal sequence has a period 1;
One heat radiating signal generator is used for producing a heat radiating signal sequence, and each heat radiation signal of this heat radiating signal sequence has a second round;
One multiplexer; Be coupled to this enabling signal generator and this heat radiating signal generator; Be used for synthesizing this enabling signal sequence and this heat radiating signal sequence; To produce a drive signal sequence, each drive signal of this drive signal sequence has a period 3, this period 3 be this period 1 and this second round sum;
One surge signal generator is used for preset luminescence properties according to this light-emitting component, produces a surge signal, and this surge signal has a period 4, and this period 4 is greater than this period 3; And
One logical block is coupled to this multiplexer, this surge signal generator and this power supply unit, is used for importing this drive signal sequence according to this surge signal, to produce this control signal in good time.
2. drive unit as claimed in claim 1, wherein this power supply unit is a Current Control power supply unit.
3. drive unit as claimed in claim 2, wherein this Current Control power supply unit is a boost type Current Control power supply unit.
4. drive unit as claimed in claim 2, wherein this Current Control power supply unit is a buck Current Control power supply unit.
5. drive unit as claimed in claim 2, wherein this Current Control power supply unit is a step-down/up type Current Control power supply unit.
6. drive unit as claimed in claim 2, wherein this Current Control power supply unit is a falling-rising pressure type Current Control power supply unit.
7. drive unit as claimed in claim 1, wherein this control signal is the combination of this drive signal sequence and a low level signal.
8. drive unit as claimed in claim 7, wherein this logical block is used for when this surge signal is one first level, exporting this drive signal sequence, and when this surge signal is one second level, exports this low level signal, to produce this control signal.
9. drive unit as claimed in claim 7; Wherein this power supply unit is used for according to this control signal; In this drive signal sequence an enabling signal during; Out-put supply is to this light-emitting component, and in this drive signal sequence a heat radiation signal during, out-put supply is not to this light-emitting component.
10. drive unit as claimed in claim 1, wherein the preset luminescence properties of this light-emitting component is the preset luminosity of this light-emitting component.
11. drive unit as claimed in claim 1, wherein the preset luminescence properties of this light-emitting component is the preset luminous chroma of this light-emitting component.
12. drive unit as claimed in claim 1, wherein this light-emitting component is a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810131747A CN101616522B (en) | 2008-06-27 | 2008-06-27 | Driving device for driving a luminous element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810131747A CN101616522B (en) | 2008-06-27 | 2008-06-27 | Driving device for driving a luminous element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101616522A CN101616522A (en) | 2009-12-30 |
| CN101616522B true CN101616522B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810131747A Expired - Fee Related CN101616522B (en) | 2008-06-27 | 2008-06-27 | Driving device for driving a luminous element |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6315380B2 (en) * | 2014-08-18 | 2018-04-25 | パナソニックＩｐマネジメント株式会社 | Lighting system |
| CN107493521B (en) * | 2016-06-12 | 2022-08-02 | 中兴通讯股份有限公司 | Signal sending method and device, signal receiving method and device, and signal transmission circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115336A (en) * | 2006-07-25 | 2008-01-30 | 东芝照明技术株式会社 | Driving device of lbd and lighting device |
| CN101169918A (en) * | 2006-10-23 | 2008-04-30 | 中华映管股份有限公司 | Light source drive circuit |
-
2008
- 2008-06-27 CN CN200810131747A patent/CN101616522B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115336A (en) * | 2006-07-25 | 2008-01-30 | 东芝照明技术株式会社 | Driving device of lbd and lighting device |
| CN101169918A (en) * | 2006-10-23 | 2008-04-30 | 中华映管股份有限公司 | Light source drive circuit |
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| Publication number | Publication date |
|---|---|
| CN101616522A (en) | 2009-12-30 |
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