CN102905445A - Method for realizing constant output light flux proportion of multi-wavelength light emitting diode (LED) light source - Google Patents
Method for realizing constant output light flux proportion of multi-wavelength light emitting diode (LED) light source Download PDFInfo
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Abstract
The invention discloses a method for realizing a constant output light flux proportion of a multi-wavelength light emitting diode (LED) light source. A proportion of an output light flux value of each sub light source in an LED combined light source during working to an output light flux of a main control sub light source; the proportion is compared with a set upper limit value and a set lower limit value; and the working current of the corresponding sub light sources exceeding a range is controlled, so that the output light flux value can be adjusted, and the proportion of the output light fluxes between the sub light sources and the main control sub light source can be returned back to the set range until an alarm condition is accorded. By the method, the output light fluxes of the sub light sources are adjusted and compensated, and the output light flux of the main control sub light source is controlled, so that the energy consumption of the LED light source is reduced, and the service life of the LED light source is prolonged.
Description
Technical field
The present invention relates to LED illumination and demonstration field, particularly a kind of method that realizes a plurality of wavelength light beam output light flux proportions constant.
Background technology
At present, light-emitting diode (LED) since its life-span length, little power consumption, light efficiency high, be easy to the characteristics such as control and environmental protection, just progressively be applied to the fields such as road lighting, office lighting, lighting of home, industrial lighting, agriculture illumination.People utilize the good emergent light wavelength monochromaticjty of LED, the led chip of the led chip by making up different outgoing wavelength and/or same outgoing wavelength but use the methods such as LED encapsulation of different phosphor material powders (corresponding different output spectrums) to obtain the led light source (hereinafter referred to as " combined light source ") of different output wavelength combination/spectrum.In the general illumination field, responsive because of the check colors deviation of gentle color of human eye, the light of different-colour is influential to people's mood and eyesight.The LED light fixture that variable color-temperature, tone are arranged on the market is for the selecting factors suitable lighting environment such as hobby, use scenes of user according to oneself.Led light source in the LED display device, also the light of requirement output different-colour, different spectrum is used the comfortable safety of eye etc. to guarantee display effect, user.In the plant illumination field, because the optical output ratio example of different ruddiness, blue light, far-red light and other color of light is different to the effect of plant, the plant growth lamp that different output wavelength combination/spectrum need to be arranged is to satisfy the illumination needs of plant growth stages.To sum up, in many instances, people require output colour temperature, tone, wavelength combinations or the spectrum of LED combined light source under each settings not change in time and change.Therefore, the spectrum spectrum constant or change light fixture output light of keeping light fixture output light arrives predetermined spectrum, for application such as eyeshield, plant growths very important meaning is arranged.
Yet, have led light source now because of its light decay so that the phenomenon of output light flux reduction inevitably occurs in use for some time as the light fixture of light source with LED.And owing to producing the light decay degree difference of the led light source (hereinafter referred to as " sub-light source ") of different wave length or spectrum, the ratio regular meeting of each output wavelength/spectrum changes in the LED combined light source.Such variation can affect the effect of illumination and demonstration in the application scenario that output wavelength/spectrum is had requirement (sight illumination described above, eyeshield illumination/demonstration, plant illumination etc.).
Adopt kind and the proportioning of adjusting led chip and fluorescent material about the method for regulating spectrum in the prior art, so that different types of spectrum to be provided.Be 201110234239.1 such as the patent No., name is called the patent of " a kind of spectrum adjusting method for plant illumination " and has described by the different types of led chip of proportioning and fluorescent material, to satisfy plant to the different demands of spectrum, can increase to a great extent the degree of freedom that spectrum is regulated.Yet, in the method the adjustment of the kind of led chip and fluorescent material and proportioning all being occurred in before light fixture comes into operation, the variation of the spectrum that causes for light decay after light fixture comes into operation does not propose effective solution.
In addition, in application that the light source output spectrum is had certain requirements, generally when light source causes output spectrum to change owing to light decay so that departs from tolerance interval, often need to replace whole light source.But in fact the light decay of each sub-light source may not reach the standard of scrapping in the combined light source.In this case whole lamp source directly being done to replace processing has caused waste, has increased cost.
Summary of the invention
The phenomenon that flux ratio different to LED combined light source presence factor light source light decay degree or each output wavelength/spectrum that other reason causes is lacked of proper care in the prior art has been taked the measure of the whole LED combined light source of direct replacement, will cause like this cost to rise.The present invention is directed to as above problem, proposed a kind of method that realizes multi-wavelength LED light source output light flux proportions constant.LED combined light source in the method comprises the sub-light source of several outgoing single wavelength/spectrum.The light beam wavelength of each sub-light source outgoing/spectrum is different.The present invention is for the method for output light flux proportions constant between each sub-light source of realizing combined light source, and concrete scheme is as follows:
A, a sub-light source of setting in the combination led light source are " master control sub-light source ", and set the upper lower limit value of its output light flux value; Set the upper lower limit value of the output light flux ratio of other each sub-light sources and master control sub-light source; The upper lower limit value of the output light flux ratio of the upper lower limit value of the master control sub-light source output light flux set and other each sub-light sources and master control sub-light source is pre-stored in the memory of control circuit;
B, detection or calculate the output light flux of master control sub-light source, and judge the upper lower limit value of the output light flux of the master control sub-light source whether it exceeds setting, report to the police if exceed then;
C, detection or calculate the output light flux value of other each sub-light sources are compared the ratio value that obtains other each sub-light source output light fluxs with its output light flux with the master control sub-light source; When the ratio value of the output light flux of one or more other sub-light sources exceeds the ratio upper lower limit value of setting, adjust these one or more other sub-light sources drive current so that the ratio value of its output light flux get back in the ratio upper lower limit value scope of setting.
When adopting such scheme, in the LED combined light source, determine a master control sub-light source, and set the output light flux upper lower limit value of master control sub-light source.Set all the other sub-light source output light fluxs except the master control sub-light source and higher limit and the lower limit of master control sub-light source output light flux ratio value according to associated lamp standard and/or user's request.The upper lower limit value of upper lower limit value, all the other sub-light sources and the master control sub-light source output light flux ratio of the master control sub-light source set is pre-stored in the memory of control circuit for light source.Control circuit receive to be surveyed pn knot junction temperature information (corresponding different output light fluxs), light source igniting time (corresponding different output light fluxs) or the output light flux information of each sub-light source that obtains, and calculates and draw the actual output light flux value of each sub-light source.On the one hand, if the output light flux of master control sub-light source exceeds the upper lower limit value to its setting, then send warning.On the other hand, when if the output light flux ratio value between parton light source and the master control sub-light source exceeds the corresponding upper lower limit value scope that sets, the operating current of the off-limits sub-light source of regulation output flux ratio value makes ratio value between the output light flux of its output light flux value and master control sub-light source between the corresponding upper lower limit value of setting respectively.By continuous detection/calculate and operating current or other parameters of regulating each sub-light source the scale dimension of output light flux between each sub-light source is held in the setting range.When reaching other alert if, this combined light source reported to the police.
The junction temperature of the pn knot of surveying each sub-light source is adopted in described detection to output light flux, and extrapolates its output light flux by the relation curve between junction temperature and the output light flux.There are a corresponding relation in junction temperature and its output light flux of the pn knot of each LED light-emitting particles, thereby the junction temperature of the pn knot by measuring different sub-light sources can be calculated and obtain separately actual output light flux of different sub-light sources, and adjust its output light flux by the operating current of control pn knot.
Described detection to the sub-light source output light flux is adopted and is calculated lighting the time of each sub-light source, and goes out output light flux by the light decay curve calculating of led light source.Each LED light-emitting particles has the relation curve of an intrinsic service time and light decay.Can extrapolate actual output light flux by the time of lighting of measuring each sub-light source, by the control operating current output light flux be adjusted.
The described output light flux that the detection of sub-light source output light flux is adopted each sub-light source of direct detection.Can survey the actual output light flux of each sub-light source respectively.
The described interval setting-up time that is measured as to each sub-light source output light flux is measured.The factors such as the set basis actual demand of time, product type arrange flexibly, and the led light source light decay is slower, will save by the measurement of interval setting-up time to survey/calculate/control cost.
Further, method for output light flux proportions constant between each sub-light source of realizing combined light source also comprises the step that surpasses the set point alarm when operating current, voltage or the temperature of any one sub-light source, this step can be located at after step a, step b or the step c, when operating current, voltage or the temperature of any one sub-light source surpass certain value, namely reach when scrapping condition, with the realization of the whole lamp function of impact, so need this phenomenon is done the processing of reporting to the police.
A kind of method that realizes multi-wavelength LED light source output light flux proportions constant of the present invention, by surveying or infer in the work of drawing the ratio between the output light flux value of each sub-light source and master control sub-light source output light flux in the LED combined light source, and with the corresponding upper lower limit value of this ratio and setting relatively, and then adjustment exceeds the operating current of the corresponding sub-light source of upper lower limit value scope, the ratio of each sub-light source and master control sub-light source output light flux is got back in the scope of setting, until reach alert if.The present invention is by to the adjustment of each sub-light source output light flux, and to the control of master control sub-light source output light flux, kept the ratio of each output wavelength/spectral light flux, prolonged the life-span of led light source.
Description of drawings
Fig. 1 is a kind of flow chart of realizing the method for multi-wavelength LED light source output light flux proportions constant of the embodiment of the invention;
Fig. 2 is that the embodiment of the invention a kind of realizes in the method for multi-wavelength LED light source output light flux proportions constant the spectrogram of each sub-light source in the LED combined light source.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
Fig. 1 is a kind of flow chart of realizing the method for multi-wavelength LED light source output light flux proportions constant of the embodiment of the invention.Fig. 2 be peak wavelength be respectively 300nm (curve a), the sub-light source spectral distribution graph of 500nm (curve b) and 700nm (curve c).Concrete steps are as follows:
Peak wavelength in a, the setting combination led light source is that the sub-light source of 500nm is the master control sub-light source, its desirable output light flux is 1500lm, and set the upper lower limit value of its output light flux value, be respectively desirable output light flux ± 10%, i.e. higher limit 1650lm and lower limit 1350lm; Setting peak wavelength is that the sub-light source of 300nm and 700nm and the desirable output light flux ratio of master control sub-light source are respectively 0.6 and 1.3, and set the upper lower limit value that peak wavelength is the output light flux ratio between the sub-light source of 300nm and 700nm and the master control sub-light source that peak wavelength is 500nm, be respectively above-mentioned desirable output light flux ratio ± 1%, i.e. 0.594-0.606 and 1.287-1.313; The desirable output light flux value of the master control sub-light source of setting and upper lower limit value thereof is pre-stored in the memory of control circuit with the upper lower limit value of the output light flux ratio of other each sub-light sources and master control sub-light source;
The output light flux of master control sub-light source is surveyed or is calculated at b, interval, and judges the upper lower limit value of the output light flux of the master control sub-light source whether it exceeds setting, reports to the police if exceed then;
The output light flux value of other each sub-light sources is surveyed or is calculated at c, interval, and its output light flux with the master control sub-light source is compared the ratio value that obtains other each sub-light source output light fluxs; When the ratio value of the output light flux of one or more other sub-light sources exceeds the ratio upper lower limit value of setting, adjust according to each sub-light source corresponding output light flux relation under different electric currents this or a plurality of other sub-light sources drive current etc. so that the ratio value of its output light flux get back in the ratio upper lower limit value scope of setting; As being that the output light flux ratio of the sub-light source of 300nm and master control sub-light source is when being 0.58 when peak wavelength, be lower than its lower limit 0.594, need to increase the operating current of this sub-light source this moment, its output light flux is risen, and so that the luminous flux export ratio of this sub-light source and master control sub-light source get back in the upper lower limit value scope of output light flux ratio of setting;
D, instruction gives a warning when the operating current of any one sub-light source of led light source surpasses certain value.
The operating current of any one sub-light source that other alert if are aforementioned finger in the accompanying drawing 1, voltage or temperature surpass certain value.
Curve of spectrum a, the b of each sub-light source in the embodiment of the invention, c can set according to practical application and user's request.Wherein, lighting the time of calculating light source to be measured adopted in the detection of light source output light flux, infer its actual output light flux value by the light decay curve of this light source to be measured.The led light source control circuit to the reception of light source output light flux signal, comparison, mensuration, to the control of operating current, send the actions such as alarm signal and all can pass through existing techniques in realizing to the detection of output light flux.
The present invention can realize the output light flux proportions constant of multi-wavelength LED light source, has simultaneously that measure error is little, simple in structure, low cost and other advantages.
Pass through above-described embodiment, purpose of the present invention is by in full force and effect having reached, the personage who is familiar with this skill should be understood that the content that the present invention includes but be not limited to describe in accompanying drawing and the top embodiment, and any modification that does not depart from function and structure principle of the present invention all will be included in the scope of claims.
Claims (6)
1. method that realizes multi-wavelength LED light source output light flux proportions constant is characterized in that may further comprise the steps:
A, a sub-light source of setting in the combination led light source are " master control sub-light source ", and set the upper lower limit value of its output light flux value; Set the upper lower limit value of the output light flux ratio of other each sub-light sources and master control sub-light source; The upper lower limit value of the output light flux ratio of the upper lower limit value of the master control sub-light source output light flux set and other each sub-light sources and master control sub-light source is pre-stored in the memory of control circuit;
B, detection or calculate the output light flux of master control sub-light source, and judge the upper lower limit value of the output light flux of the master control sub-light source whether it exceeds setting, report to the police if exceed then;
C, detection or calculate the output light flux value of other each sub-light sources are compared the ratio value that obtains other each sub-light source output light fluxs with its output light flux with the master control sub-light source; When the ratio value of the output light flux of one or more other sub-light sources exceeds the ratio upper lower limit value of setting, adjust these one or more other sub-light sources drive current so that the ratio value of its output light flux get back in the ratio upper lower limit value scope of setting.
2. a kind of method that realizes multi-wavelength LED light source output light flux proportions constant according to claim 1, it is characterized in that, the junction temperature of the pn knot of surveying each sub-light source is adopted in described detection to output light flux, and extrapolates its output light flux by the relation curve between junction temperature and the output light flux.
3. a kind of method that realizes multi-wavelength LED light source output light flux proportions constant according to claim 1, it is characterized in that: described detection to the sub-light source output light flux is adopted and is calculated lighting the time of each sub-light source, and goes out output light flux by the light decay curve calculating of led light source.
4. a kind of method that realizes multi-wavelength LED light source output light flux proportions constant according to claim 1 is characterized in that: the described output light flux that the detection of sub-light source output light flux is adopted each sub-light source of direct detection.
5. a kind of method that realizes multi-wavelength LED light source output light flux proportions constant according to claim 1 is characterized in that: the described interval setting-up time that is measured as to each sub-light source output light flux is measured.
6. a kind of method that realizes multi-wavelength LED light source output light flux proportions constant according to claim 1, it is characterized in that: described method also comprises the step that surpasses the set point alarm when operating current, voltage or the temperature of any one sub-light source, and this step can be located at after step a, step b or the step c.
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| CN110112128A (en) * | 2019-05-24 | 2019-08-09 | 温州大学新材料与产业技术研究院 | A kind of preparation and application of full spectrum intelligence plant lamp |
| CN110856307A (en) * | 2019-11-21 | 2020-02-28 | 哈尔滨工业大学（深圳） | Light flux and chromaticity coordinate tracking control method of RGB (red, green and blue) color mixing system |
| WO2020244643A1 (en) * | 2019-06-05 | 2020-12-10 | 深圳市光擎光电有限公司 | Light mixing adjustment method, device and system, and storage medium |
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