CN101674691A - Method for controlling light source of light emitting diode (LED) to emit light stably - Google Patents
Method for controlling light source of light emitting diode (LED) to emit light stably Download PDFInfo
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- CN101674691A CN101674691A CN200810215642A CN200810215642A CN101674691A CN 101674691 A CN101674691 A CN 101674691A CN 200810215642 A CN200810215642 A CN 200810215642A CN 200810215642 A CN200810215642 A CN 200810215642A CN 101674691 A CN101674691 A CN 101674691A
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Abstract
The invention relates to a method for controlling the light source of a light emitting diode (LED) to emit light stably, wherein the light source of the LED is radiated by a common radiating module. The method comprises the following steps: providing a fixed current source to drive the light source of the LED, and obtaining a corresponding reference voltage value from the driving current generatedby the fixed current source; monitoring and obtaining a dynamic voltage-drop value between the two electrodes of the light source of the LED; and comparing the dynamic voltage-drop value with the reference voltage value to adjust a radiating power value of the radiating module, therefore, the dynamic voltage-drop value of the light source of the LED is approximate to the reference voltage value.By instantly monitoring the dynamic voltage-drop value of the light source of the LED and instantly adjusting the radiating power value of the radiating module, the invention ensures that the light emitting intensity of the light source of the LED is kept stable.
Description
Technical field
The present invention relates to a kind of control method of LED source stabilized illumination, particularly relate to a kind of control method of LED source stabilized illumination of the heat radiation power value that is applied to adjust immediately radiating module.
Background technology
Along with the development of opto-electronics, the at present existing trend of using light-emitting diode to replace conventional light source gradually, but still must improve the luminous intensity of light-emitting diode and it is kept stable, the demand on could realistic use.Yet, because when opening light-emitting diode for a long time, the heat that light-emitting diode produced can constantly be accumulated, and then improve the surface temperature that connects of light-emitting diode, and make the luminous efficacy of light-emitting diode decay, so that the constantly decline of the luminous intensity of light-emitting diode, and can't keep stable.
For the luminous intensity that makes light-emitting diode is kept stable, developed at present and to be used various optical detecting devices (Optical sensor), temperature detecting device (Temperature sensor) and detecting voltage device (Voltage sensor) ... waited the LED source drive unit of detector, in order to driving and immediately monitoring light-emitting diode, and make the luminous intensity of light-emitting diode keep stable.
As U.S.'s bulletin patent the 7th, 132, described in No. 805, it is an operating characteristic of utilizing temperature detecting device, current sense device (Current waveform sensor) and voltage derivative detector (Voltagedifferential sensor) monitoring light-emitting diode, for example working temperature, operating current ... etc., and the instant size of current of adjusting input, and then the luminous intensity of light-emitting diode is tended towards stability.
In addition, described in U.S.'s publication the 2006/0022614th A1 number, it is glow color and a working temperature of utilizing color optics detector and temperature detecting device immediately monitoring light-emitting diode respectively.In addition, light-emitting diode is can be arranged on the heat abstractor and in conjunction with feedback mechanism, working temperature by temperature detecting device immediately monitoring light-emitting diode, and the heat radiation power value of adjustment heat abstractor, in order to immediately the thermal conductance that light-emitting diode produced being gone out, and then make the luminous intensity of light-emitting diode reach stable.
Yet above-mentioned described LED source drive unit all needs collocation simultaneously to use various optical detecting devices, temperature detecting device and detecting voltage device ... etc., not only can make the structure complicated of LED source drive unit, also significantly improved the manufacturing cost of LED source drive unit, and employed control method is also very complicated.
This shows that existing LED source drive unit obviously still has inconvenience and defective, and demands urgently further being improved in control method and use.For solving the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and general LED source drive unit does not have appropriate control method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of control method of new LED source stabilized illumination, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing LED source drive unit exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of control method of new LED source stabilized illumination, can improve general existing LED source drive unit, make it have more practicality.Through constantly research, design, and after studying repeatedly and improving, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing LED source drive unit exists, and provide a kind of control method of new LED source stabilized illumination, technical problem to be solved is to make it learn the variation that connects surface temperature of LED source by immediately monitoring dynamic pressure drop value, and the heat radiation power value of adjustment radiating module, so that being able to instant loosing, the heat that LED source produced removes, and make the dynamic pressure drop value convergence reference voltage level of LED source and then the luminous intensity of stabilized illumination diode light-source.By this can be in order to simplifying the structure of existing known LED source drive unit, and then reduce the manufacturing cost of LED source drive unit, be very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.The control method of a kind of LED source stabilized illumination that proposes according to the present invention, this LED source is to dispel the heat by a radiating module, this control method may further comprise the steps: provide a constant current source driving this LED source, and obtain a corresponding reference voltage level with the drive current that this constant current source produces; Monitoring also obtains this LED source two interelectrode dynamic pressure drop values; And relatively this dynamic pressure drop value and this reference voltage level, to adjust a heat radiation power value of this radiating module, make this reference voltage level of dynamic pressure drop value convergence of this LED source by this.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The control method of aforesaid LED source stabilized illumination, wherein said LED source are the combination of a light-emitting diode or many light-emitting diodes.
The control method of aforesaid LED source stabilized illumination, wherein said dynamic pressure drop value are to obtain by a detecting voltage unit.
The control method of aforesaid LED source stabilized illumination, wherein said dynamic pressure drop value is a voltage drop value forward of this LED source, if this dynamic pressure drop value then reduces this heat radiation power value greater than this reference voltage level, if this dynamic pressure drop value then improves this heat radiation power value less than this reference voltage level.
The present invention compared with prior art has tangible advantage and beneficial effect.As known from the above, for achieving the above object, the present invention proposes a kind of control method of LED source stabilized illumination, LED source is to dispel the heat by a radiating module, control method comprises the following steps: to provide a constant current source with the driven for emitting lights diode light-source, and obtains a corresponding reference voltage level with the drive current that constant current source produces; Monitoring also obtains LED source two interelectrode dynamic pressure drop values; And compare dynamic pressure drop value and reference voltage level, to adjust a heat radiation power value of radiating module, make the dynamic pressure drop value convergence reference voltage level of LED source by this.
Above-mentioned control method, wherein LED source can be the combination of a light-emitting diode or many light-emitting diodes.
Above-mentioned control method, wherein the dynamic pressure drop value is to obtain by a detecting voltage unit, and the dynamic pressure drop value can be a voltage drop value forward of LED source, if the dynamic pressure drop value is greater than reference voltage level, then reduce the heat radiation power value of radiating module, if the dynamic pressure drop value less than reference voltage level, then improves the heat radiation power value of radiating module.
By technique scheme, the control method of LED source stabilized illumination of the present invention has following advantage and beneficial effect at least:
Can simplify the control method of LED source, and make the LED source stabilized illumination.
Dynamic pressure drop value by the immediately monitoring light-emitting diode can re-use the structure that extra detector can be simplified the LED source drive unit.
Use extra detector by reducing, can reduce the manufacturing cost of LED source drive unit.
In sum, the present invention is a kind of control method of LED source stabilized illumination, LED source is to dispel the heat by radiating module, and control method comprises the following steps: to provide constant current source with the driven for emitting lights diode light-source, and obtains the corresponding reference magnitude of voltage; Monitor and obtain the dynamic pressure drop value of LED source; And compare dynamic pressure drop value and reference voltage level, to adjust the heat radiation power value of radiating module, make the dynamic pressure drop value convergence reference voltage level of LED source.By the dynamic pressure drop value of immediately monitoring LED source, and adjust the heat radiation power value of radiating module immediately, can make the luminous intensity of LED source keep stable.The present invention has above-mentioned advantage and practical value, no matter it all has bigger improvement on method or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing LED source drive unit has the outstanding effect of enhancement, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Figure 1A is the control method flow chart of a kind of LED source stabilized illumination of the present invention.
Figure 1B is a kind of control method flow chart of adjusting the heat radiation power value of radiating module of the present invention.
Fig. 2 is the graph of a relation of a kind of time-dynamic pressure drop value before and after the invention process.
Fig. 3 is a kind of time-the connect graph of a relation of surface temperature before and after the invention process.
Fig. 4 is the graph of a relation of a kind of time-luminous intensity before and after the invention process.
S10 a: constant current source is provided and obtains a corresponding reference voltage level
S20: monitor and obtain a dynamic pressure drop value S30: a heat radiation power value of adjusting radiating module
S32: reduce heat radiation power value S31: compare dynamic pressure drop value and reference voltage level
S33: improve heat radiation power value V
0: reference voltage level
V
D: dynamic pressure drop value V
D1: the dynamic pressure drop value
T
1: very first time point T
2: second time point
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of control method, method, step, feature and the effect thereof of the LED source stabilized illumination that foundation the present invention is proposed, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to present in the detailed description of graphic preferred embodiment is consulted in following cooperation.By the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to obtain one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Figure 1A is the control method flow chart of a kind of LED source stabilized illumination of the present invention.Figure 1B is a kind of control method flow chart of adjusting the heat radiation power value of radiating module of the present invention.Fig. 2 is a kind of time-dynamic pressure drop value V before and after the invention process
DGraph of a relation.Fig. 3 is a kind of time-the connect graph of a relation of surface temperature before and after the invention process.Fig. 4 is the graph of a relation of a kind of time-luminous intensity before and after the invention process.
See also shown in Figure 1A, the control method of a kind of LED source stabilized illumination of preferred embodiment of the present invention, LED source is to dispel the heat by a radiating module, with so that accumulate on the heat of LED source and be able to instant loosing and remove, and control method comprises the following steps: to provide a constant current source and obtain a corresponding reference voltage level S10; Monitoring also obtains a dynamic pressure drop value S20; An and heat radiation power value S30 who adjusts radiating module.
One constant current source is provided and obtains a corresponding reference voltage level S10:,, and obtain corresponding reference magnitude of voltage V with the drive current that constant current source was produced so that LED source is luminous by constant current source driven for emitting lights diode light-source
0LED source can be the combination of a light-emitting diode or many light-emitting diodes, and the emission wavelength of LED source can be between 380 nanometer to 800 nanometers, but are not limited only to this.
Monitoring also obtains a dynamic pressure drop value S20: can be by a detecting voltage unit monitors LED source two interelectrode pressure drops to obtain dynamic pressure drop value V
D, and because dynamic pressure drop value V
DHave linear relation with the surface temperature that connects of LED source, therefore can be by immediately monitoring dynamic pressure drop value V
DAnd learn and corresponding connect surface temperature and whether change.
Again because connect surface temperature when rising when LED source, i.e. expression has the input power of part to be converted into heat energy, therefore reduced the luminous intensity of LED source, relative when LED source connect surface temperature decline the time, i.e. expression has the input power of part to be converted into luminous energy, so improved the luminous intensity of LED source.When the connecing surface temperature and luminous intensity and change of LED source, the dynamic pressure drop value V of LED source
DAlso can change thereupon, therefore can be by the dynamic pressure drop value V that directly monitors LED source
DConnect surface temperature and change of luminous intensity with the monitoring LED source.
Adjust a heat radiation power value S30 of radiating module: see also shown in Figure 1B, it can be divided into three sub-steps, comprising: compare dynamic pressure drop value and reference voltage level S31; Reduce heat radiation power value S32; And raising heat radiation power value S33.
Compare dynamic pressure drop value and reference voltage level S31: compare dynamic pressure drop value V
DAnd reference voltage level V
0Size, can learn LED source connect surface temperature and whether luminous intensity changes.Can dispel the heat immediately by radiating module owing to LED source in addition, in order to reduce the surface temperature that connects of LED source, therefore can be according to comparing dynamic pressure drop value V
DAnd reference voltage level V
0The result, and adjust the heat radiation power value of radiating module, and then adjust the dynamic pressure drop value V of LED source
D, make dynamic pressure drop value V
DLevel off to reference voltage level V
0, and make the luminous intensity of LED source keep stable.
Reduce heat radiation power value S32: as dynamic pressure drop value V
DBe forward during voltage drop value, of LED source if dynamic pressure drop value V
DGreater than reference voltage level V
0(V
D＞V
0), the surface temperature that connects of promptly representing LED source descends, and the luminous intensity of LED source rises, therefore can be by the heat radiation power value that reduces radiating module, return back to the luminous intensity of initial condition and make the luminous intensity of LED source descend.
Improve heat radiation power value S33: as dynamic pressure drop value V
DBe forward during voltage drop value, of LED source if dynamic pressure drop value V
DLess than reference voltage level V
0(V
D＜V
0), the surface temperature that connects of promptly representing LED source rises, and the luminous intensity of LED source descends, therefore can be by the heat radiation power value that improves radiating module, and then reduce and to connect surface temperature, and make the luminous intensity of LED source rise to return back to the luminous intensity of initial condition.
For instance, see also Fig. 2, Fig. 3 and shown in Figure 4, as dynamic pressure drop value V
DDuring for voltage drop value forward, between very first time point T
1With the second time point T
2Between time range in dynamic pressure drop value V
D1Be less than reference voltage level V
0, it is that the surface temperature that connects of representing LED source rises, and the luminous intensity of LED source descends.Therefore, can be by the heat radiation power value that improves radiating module, and make that connecing surface temperature descends, and make the dynamic pressure drop value V of LED source
DLevel off to reference voltage level V
0, therefore at the second time point T
2Luminous intensity when afterwards, the rising of the luminous intensity of LED source returns back to initial condition.
On the contrary, if the dynamic pressure drop value V of LED source
DRise and greater than reference voltage level V
0The time, represent that promptly the surface temperature that connects of LED source descends, and the luminous intensity of LED source rises.Therefore, can reduce the heat radiation power value of radiating module, in order to the accumulation heat that LED source produced, and then improve the surface temperature that connects of LED source, and reduce the luminous intensity of LED source, luminous intensity when returning back to initial condition so that the luminous intensity of LED source descends.
See also shown in Figure 1A,, can constantly monitor and obtain dynamic pressure drop value V by the enforcement of present embodiment
D, directly the surface temperature that connects of immediately monitoring LED source changes by this, and adjusts the heat radiation power value of radiating module immediately, and makes the dynamic pressure drop value V of LED source
DAdjustment levels off to reference voltage level V
0, and make the luminous intensity of LED source keep stable.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (4)
1, a kind of control method of LED source stabilized illumination, this LED source are to dispel the heat by a radiating module, it is characterized in that this control method may further comprise the steps:
Provide a constant current source driving this LED source, and obtain a corresponding reference voltage level with the drive current that this constant current source produces;
Monitoring also obtains this LED source two interelectrode dynamic pressure drop values; And
Relatively this dynamic pressure drop value and this reference voltage level to adjust a heat radiation power value of this radiating module, make this reference voltage level of dynamic pressure drop value convergence of this LED source by this.
2, the control method of LED source stabilized illumination according to claim 1 is characterized in that wherein said LED source is the combination of a light-emitting diode or many light-emitting diodes.
3, the control method of LED source stabilized illumination according to claim 1 is characterized in that wherein said dynamic pressure drop value is to obtain by a detecting voltage unit.
4, the control method of LED source stabilized illumination according to claim 1, it is characterized in that the forward voltage drop value of wherein said dynamic pressure drop value for this LED source, if this dynamic pressure drop value then reduces this heat radiation power value greater than this reference voltage level, if this dynamic pressure drop value then improves this heat radiation power value less than this reference voltage level.
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| CN200810215642A CN101674691A (en) | 2008-09-08 | 2008-09-08 | Method for controlling light source of light emitting diode (LED) to emit light stably |
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| CN200810215642A CN101674691A (en) | 2008-09-08 | 2008-09-08 | Method for controlling light source of light emitting diode (LED) to emit light stably |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105717A (en) * | 2011-11-15 | 2013-05-15 | 宏碁股份有限公司 | Projector and relative control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105717A (en) * | 2011-11-15 | 2013-05-15 | 宏碁股份有限公司 | Projector and relative control method |
| CN103105717B (en) * | 2011-11-15 | 2015-04-08 | 宏碁股份有限公司 | Projector and relative control method |
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Application publication date: 20100317 |