CN105357823A - Method for solving LED illumination decay - Google Patents
Method for solving LED illumination decay Download PDFInfo
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- CN105357823A CN105357823A CN201510800903.2A CN201510800903A CN105357823A CN 105357823 A CN105357823 A CN 105357823A CN 201510800903 A CN201510800903 A CN 201510800903A CN 105357823 A CN105357823 A CN 105357823A
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Abstract
The invention relates to an apparatus and method for solving LED illumination decay. The apparatus is composed of a processor, a power supply module, a depreciation statistics unit, and an LED drive circuit; the power supply module is connected with the processor and the depreciation statistics unit; and the output terminal of the processor is connected with the LED drive circuit. The method is characterized in that the processor starts LED illumination and drives the depreciation statistics unit to record and store accumulated working time of an LED light source; threshold values of all stages are set based on an LED light source decay curve; the threshold values of all stages are corrected according to an environment temperature of the LED light source; and the processor adjusts the output power of the LED light source according to the threshold values of all stages. According to the invention, when decay is generated with increasing of working time of the LED light source, the brightness of the LED light source is enhanced by increasing the working current of the LED light source gradually, thereby compensating the illuminance that has been reduced due to decay.
Description
Technical field
The present invention relates to a kind of method solving LED illumination light decay.
Background technology
LED light source is widely applied as lighting apparatus.Due to the effect of various agine mechaism, cause LED light source after used a period of time, under identical condition of power supply, its luminous flux can be decayed gradually, is referred to as in the industry " light decay ".The light decay of LED light source generally starts (different LED qualities and operating ambient temperature height can produce difference) after 5000 hours in work, and light decay amount changes along with the increase of operating time thereupon.General work is to the lifetime limitation of LED light source, and light decay amount can reach 15%-25%
The result that light decay makes LED one-tenth is: 1) user is in use LED illumination device process, can think that brightness is more and more lower; 2) multiple LED illumination device common use a period of time after, if after the LED light source that more renews of user, after having the LED light source contrasting previous contemporaneity, will find there is obvious difference in brightness between new, old LED light source.Therefore, the light decay of LED light source can cause very bad experience to user.
Summary of the invention
The object of this invention is to provide a kind of method solving LED illumination light decay, make there is obvious brightness without significant difference between new, old light source, for this reason, the present invention by the following technical solutions:
A kind of LED illumination control device, comprises processor, power module, depreciation statistic unit and LED drive circuit;
Described power module is connected with processor, depreciation statistic unit, and described processor output is connected with field LED drive circuit.
Further, described a kind of LED illumination control device, described depreciation statistic unit is connected with temperature sensor.
Further, a kind of LED illumination control method, described method application rights requires the device of 1,2, comprises the following steps:
Step 1: processor drives depreciation statistic unit record and stores the cumulative operation time of LED light source while starting LED illumination;
Step 2: set each phase threshold with LED light source light decay curve;
Step 3: revise each phase threshold by ambient temperature residing for LED light source;
Step 4: processor is according to each phase threshold adjustment LED light source power output;
Described processor is in startup LED illumination and before not reaching threshold value, maintenance low-power exports, and LED illumination arrives with after the threshold value of LED light source light decay Curves setting, and processor increases the power output of LED light source brightness.Described depreciation statistic unit prestores LED light source light decay time graph table, the cumulative operation time of real time record current LED light source, and described cumulative operation time and described LED light source light decay time graph table are compared, simultaneously the information after is relatively sent to processor; Described depreciation statistic unit is provided with temperature adjustmemt unit, temperature adjustmemt unit real time record LED light source operating ambient temperature, revise the LED light source light decay time graph table threshold value that LED light source changes because of variations in temperature simultaneously, and this revised threshold value is sent to processor.
Further, LED illumination, when not arriving light decay time graph first threshold value, only exports with LED light source 75% ~ 80% brightness power.
Further, after arrival is with each threshold value set by LED light source light decay time graph, processor is according to the power output of adjusting thresholds LED light source brightness.
Owing to adopting technical scheme of the present invention, processor of the present invention according to LED light source light decay curve table, can increase different brightness offset value at different accumulative usage time intervals, from but LED light source in its length of life whole, brightness is consistent substantially; LED light source just started working also there is not light decay time, according to its light decay degree, more reserved brightness, namely and sub-load output brightness.When producing light decay when the increase along with the LED light source operating time, increase LED light source brightness by the operating current progressively increasing LED light source and compensate the illuminance that light decay reduces.Like this during the whole working life of LED light source, its brightness is consistent substantially.To the difference that user does not occur because of light decay between sensation LED light source when new, old LED light source used in combination.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram solving the embodiment of the method for LED illumination light decay provided by the present invention.
Fig. 2 is LED light source decay pattern provided by the present invention.
The toponym that in above accompanying drawing, each number designation refers to is as follows:.
Embodiment
With reference to accompanying drawing.A kind of LED illumination control device comprises processor, power module, depreciation statistic unit and LED drive circuit;
Described power module 1 is connected with processor 2, depreciation statistic unit 4, and described depreciation statistic unit 4 input is connected with temperature sensor 101, and described processor output is connected with LED drive circuit 3.
Step 1, processor drive depreciation statistic unit record and store the cumulative operation time of LED light source while starting LED illumination;
Step 2, set each phase threshold with LED light source light decay curve;
Step 3, temperature adjustmemt unit revise each phase threshold by ambient temperature residing for LED light source;
Step 4, processor are according to each phase threshold adjustment LED light source power output;
Described processor is in startup LED illumination and before not reaching threshold value, maintenance low-power exports, and LED illumination arrives with after the threshold value of LED light source light decay Curves setting, and processor increases the power output of LED light source brightness.Described depreciation statistic unit prestores LED light source light decay time graph table, the cumulative operation time of real time record current LED light source, and described cumulative operation time and described LED light source light decay time graph table are compared, simultaneously the information after is relatively sent to processor; Described depreciation statistic unit is provided with temperature adjustmemt unit, temperature adjustmemt unit real time record LED light source operating ambient temperature, revise the LED light source light decay time graph table threshold value that LED light source changes because of variations in temperature simultaneously, and this revised threshold value is sent to processor.
embodiment 1
Use in the industry lumen number to demarcate the brightness of LED light source, such as its nominal brightness of nominal is 700 lumens, 1200 lumens, etc.Considering the light decay problem that LED exists, so in order to ensure that LED light source all meets the requirement of nominal brightness in its length of life, can reserve the surplus of some brightness in LED device when designing, therefore when dispatching from the factory, brightness can higher than nominal brightness.
Can configure according to LED light source light decay time graph, as shown in Figure 1, before the cumulative operation time of LED light source is less than 5000 hours, processor only exports the brightness of LED light source 80%
When the cumulative operation time of LED light source reaches 5000 hours, processor suitably increases the brightness of LED light source, such as, increase by 2%, and compensate the brightness deterioration that light decay causes, the rest may be inferred.Processor, according to the time dependent curve of the light decay of LED light source, suitably increases the brightness offset value of LED light source.The light decay degree of LED light source is not generally linear over time, and during beginning, the light decay cycle is longer, and light decay degree is lower, and the light decay cycle in later stage is short and light decay degree is larger.Such as LED light source work first 5000 hours light decays generally at 2%-3%; And after 10000 hours, just reach about 5% every 3000 hours light decays.Therefore processor according to the light decay curve of LED light source, can increase different brightness offset value at different accumulative usage time intervals, thus makes LED light source in its length of life whole, and brightness is consistent substantially.
Such as nominal brightness is the LED light source of 700 lumens, and when dispatching from the factory, brightness can reach 850 lumens.Design parameter is arranged as following table:
| Operating time (thousand hours) | <5 | 5 | 10 | 13 | 16 | 18 | 20 |
| Offset % | 0 | 2 | 5 | 10 | 15 | 20 | 25 |
| Processor output brightness % | 75 | 77 | 80 | 85 | 90 | 95 | 100 |
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (5)
1. a LED illumination control device, is characterized in that, described device comprises processor, power module, depreciation statistic unit and LED drive circuit;
Described power module is connected with processor, depreciation statistic unit, and described processor output is connected with LED drive circuit.
2. a kind of LED illumination control device according to claim 1, is characterized in that, described depreciation statistic unit is connected with temperature sensor.
3. a LED illumination control method, is characterized in that, described method application rights requires the device of 1,2, and comprises the following steps:
Step 1: processor drives depreciation statistic unit record and stores the cumulative operation time of LED light source while starting LED illumination;
Step 2: set each phase threshold with LED light source light decay curve;
Step 3: revise each phase threshold by ambient temperature residing for LED light source;
Step 4: processor is according to each phase threshold adjustment LED light source power output;
Described processor is in startup LED illumination and before not reaching threshold value, maintenance low-power exports, and LED illumination arrives with after the threshold value of LED light source light decay Curves setting, and processor increases the power output of LED light source brightness.Described depreciation statistic unit prestores LED light source light decay time graph table, the cumulative operation time of real time record current LED light source, and described cumulative operation time and described LED light source light decay time graph table are compared, simultaneously the information after is relatively sent to processor; Described depreciation statistic unit is provided with temperature adjustmemt unit, temperature adjustmemt unit real time record LED light source operating ambient temperature, revise the LED light source light decay time graph table threshold value that LED light source changes because of variations in temperature simultaneously, and this revised threshold value is sent to processor.
4. a kind of LED illumination control method according to claim 2, is characterized in that: LED illumination, when not arriving light decay time graph first threshold value, only exports with LED light source 75% ~ 80% brightness power.
5. a kind of LED illumination control method according to claim 3, is characterized in that: after arrival is with each threshold value set by LED light source light decay time graph, the power output of processor adjustment LED light source brightness.
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| CN201510800903.2A CN105357823A (en) | 2015-11-19 | 2015-11-19 | Method for solving LED illumination decay |
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| CN201510800903.2A CN105357823A (en) | 2015-11-19 | 2015-11-19 | Method for solving LED illumination decay |
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Cited By (8)
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| CN106304491A (en) * | 2016-08-19 | 2017-01-04 | 江苏恒鹏智能电气有限公司 | Based on the energy-saving control method in the initial illumination of LED to specific illumination range |
| CN108449834A (en) * | 2018-03-26 | 2018-08-24 | 浙江朗骏电子科技有限公司 | A kind of light attenuation compensation method of City Roadway Light Control System |
| CN108886851A (en) * | 2016-03-10 | 2018-11-23 | 伊诺瓦半导体有限责任公司 | Method and device for luminance compensation in light emitting diode |
| CN109104784A (en) * | 2018-07-04 | 2018-12-28 | 南京迈瑞生物医疗电子有限公司 | Luminosity compensation method, apparatus, equipment and the computer storage medium of operating lamp |
| CN110234190A (en) * | 2018-03-06 | 2019-09-13 | 松下家电研究开发（杭州）有限公司 | A kind of control method of toilet seat headlamp |
| CN110677958A (en) * | 2019-09-11 | 2020-01-10 | 上海绿浦环保科技有限公司 | Light attenuation compensation method based on knowledge base |
| CN110941118A (en) * | 2019-11-11 | 2020-03-31 | 深圳市华星光电半导体显示技术有限公司 | Lamp tube illumination control method of ultraviolet baking oven and ultraviolet baking oven |
| CN114007311A (en) * | 2021-12-30 | 2022-02-01 | 广州市浩洋电子股份有限公司 | Stage lamp system capable of realizing brightness correction according to attenuation coefficient |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108886851A (en) * | 2016-03-10 | 2018-11-23 | 伊诺瓦半导体有限责任公司 | Method and device for luminance compensation in light emitting diode |
| CN106304491A (en) * | 2016-08-19 | 2017-01-04 | 江苏恒鹏智能电气有限公司 | Based on the energy-saving control method in the initial illumination of LED to specific illumination range |
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| CN110234190A (en) * | 2018-03-06 | 2019-09-13 | 松下家电研究开发（杭州）有限公司 | A kind of control method of toilet seat headlamp |
| CN108449834A (en) * | 2018-03-26 | 2018-08-24 | 浙江朗骏电子科技有限公司 | A kind of light attenuation compensation method of City Roadway Light Control System |
| CN109104784A (en) * | 2018-07-04 | 2018-12-28 | 南京迈瑞生物医疗电子有限公司 | Luminosity compensation method, apparatus, equipment and the computer storage medium of operating lamp |
| CN110677958A (en) * | 2019-09-11 | 2020-01-10 | 上海绿浦环保科技有限公司 | Light attenuation compensation method based on knowledge base |
| CN110941118A (en) * | 2019-11-11 | 2020-03-31 | 深圳市华星光电半导体显示技术有限公司 | Lamp tube illumination control method of ultraviolet baking oven and ultraviolet baking oven |
| CN110941118B (en) * | 2019-11-11 | 2022-03-08 | 深圳市华星光电半导体显示技术有限公司 | Lamp tube illumination control method of ultraviolet baking oven and ultraviolet baking oven |
| CN114007311A (en) * | 2021-12-30 | 2022-02-01 | 广州市浩洋电子股份有限公司 | Stage lamp system capable of realizing brightness correction according to attenuation coefficient |
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