CN102595707A - Light-emitting diode (LED) signal light source capable of eliminating color drift - Google Patents
Light-emitting diode (LED) signal light source capable of eliminating color drift Download PDFInfo
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- CN102595707A CN102595707A CN2012100085208A CN201210008520A CN102595707A CN 102595707 A CN102595707 A CN 102595707A CN 2012100085208 A CN2012100085208 A CN 2012100085208A CN 201210008520 A CN201210008520 A CN 201210008520A CN 102595707 A CN102595707 A CN 102595707A
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Abstract
The invention relates to a light-emitting diode (LED) signal light source, in particular to a yellow LED signal light source capable of eliminating color drift. The LED signal light source capable of eliminating color drift comprises at least two or two groups of LED chips or LEDs with different wavelengths in the same color chromatography, wherein two or two groups of LED chips or LEDs with different wavelengths are connected in series with resistors with different temperature performance curves respectively, and connected in parallel to a constant current source loop; the resistors automatically adjust the light intensity of the LED chips or LEDs with different wavelengths according to different temperatures, so that the center wavelength of mixed light is kept at or close to the wavelength of the LED chips or LEDs with high lighting intensity. The LED signal light source capable of eliminating color drift is simple in structure, low in cost and good in using effect, and solves the problem of color drift of an LED signal lamp caused by ambient temperature.
Description
Technical field
The present invention relates to a kind of LED signal optical source, particularly relate to a kind of yellow led signal optical source that can effectively eliminate color drift.
Background technology
Traditional railway signal lamp is to be signal optical source with the incandescent lamp, becomes red, green, yellow colour-light signals after filtering through the coloured glass lens.Its shortcoming is that service life of incandescent lamp has only 500 hours, and maintenance workload is big, and luminous efficiency is low in addition, is unfavorable for energy savings.The led light source life-span reaches 50000 hours, long service life, and maintenance workload is little, and energy consumption is low, is the illuminating product of future generation that replaces incandescent lamp.The Ministry of Railways had issued industry standard TB/T3242-2010 " LED railway signaling mechanism general technical specifications " in 2010, promoted the application of LED railway signal lamp more.Since be signal lamp, just should color identification very accurate, therefore, for fear of identification subjectivity difference, each color standard is very strict, and enough personal distance are arranged between the color.
But in practical application, have its chromaticity scope of color (like yellow) of indivedual led light sources just very narrow: require centre wavelength at 590nm between the 600nm.Because LED luminance temperature characteristic is clearly, the drift of its emission wavelength with variations in temperature, every rising 1 degree of general temperature, wavelength increases 0.1nm.Railway signal lamp is worked for a long time in the open air; Its operating ambient temperature is low to-40 ℃; High temperature reaches 70 ℃, and this will cause no matter select what led chip of normal temperature wavelength, the LED glow color all can exceed outside the critical field under high temperature, low-temperature condition; Possibly let the part driver difficult, accidents caused to the color identification of signal lamp.
At present for solving the problem of LED glow color with temperature drift; Usually adopt direct temperature compensation; Such as when temperature is low, heating automatically, perhaps when temperature is higher, increase heat radiation or add the semiconductor chilling plate cooling, guarantee the not occurrence temperature skew of LED signal lamp.Adopt the shortcoming of direct temperature compensation method technical scheme to be; Heating and refrigeration need energy to be higher than far away and are used for the luminous energy of LED; LED conduct luminescent device the most efficiently loses meaning own; Direct temperature adjustment has heat inertia, signal lamp to begin bright phase temperature not obtain adjustment timely.
Summary of the invention
The present invention is directed to the prior art deficiency, propose a kind of simple in structure, cost is low, and result of use is good, can effectively eliminate the LED signal optical source of color drift, has solved the color drift problem that the LED signal lamp causes because of ambient temperature.
The technical scheme that the present invention adopted:
A kind of LED signal optical source of eliminating color drift; Contain more than two or two groups the LED luminescence chip or the luminous tube of different wave length in the color chromatogram of the same race at least; Connect the respectively resistance of different temperatures performance curve of the LED luminescence chip of the above different wave lengths of said two or two groups or luminous tube; And then be connected in parallel and insert in the constant-current source loop together; According to the LED luminescence chip of the different different wave lengths of adjustment automatically of temperature or the luminous intensities of luminous tube, the centre wavelength of mixed light is kept or more near the bigger the sort of LED luminescence chip of luminous intensity or the wavelength of luminous tube through said resistance.
The LED signal optical source of described elimination color drift, the thermistor NTC of the negative temperature coefficient of LED luminescence chip that its medium wavelength is lower or luminous tube series connection, the thermistor PTC of the positive temperature coefficient of LED luminescence chip that wavelength is higher or luminous tube series connection.
The LED signal optical source of described elimination color drift; For yellow led luminescence chip or luminous tube; The thermistor NTC of wavelength LED luminous tube or luminous tube series connection negative temperature coefficient of (wavelength is lower) in 585nm～590nm scope, wavelength the LED luminescence chip of (wavelength is higher) or the thermistor PTC of luminous tube series connection positive temperature coefficient in 600nm～605nm scope.
The LED signal optical source of described elimination color drift, the thermistor NTC of the LED luminescence chip that its medium wavelength is lower or luminous tube series connection negative temperature coefficient, LED luminescence chip that wavelength is higher or the luminous tube conventional resistance of connecting.
The LED signal optical source of described elimination color drift; For yellow led luminescence chip or luminous tube; The thermistor NTC of wavelength LED luminous tube or luminous tube series connection negative temperature coefficient of (wavelength is lower) in 585nm～590nm scope, wavelength LED luminescence chip or the luminous tube of (wavelength is higher) in the 600nm～610nm scope conventional resistance of connecting.
The LED signal optical source of described elimination color drift, LED luminescence chip that its medium wavelength is lower or the luminous tube conventional resistance of connecting, the thermistor PTC of LED luminescence chip that wavelength is higher or luminous tube series connection positive temperature coefficient.
The LED signal optical source of described elimination color drift; For yellow led luminescence chip or luminous tube; Wavelength LED luminous tube or luminous tube of (wavelength is lower) in 585nm～590nm scope conventional resistance of connecting, wavelength the LED luminescence chip of (wavelength is higher) or the thermistor PTC of luminous tube series connection positive temperature coefficient in 600nm～610nm scope.
The LED signal optical source of described elimination color drift; In the time of more than the LED luminescence chip of different wave length or luminous tube are two groups; Wherein every group of LED luminescence chip or luminous tube quantity are 1～N and do not wait; LED luminescence chip or the luminous tube wavelength of forming every group of LED luminescence chip or luminous tube are close, and the operating voltage of every group of LED luminescence chip or luminous tube coupling.
The principle of technical scheme of the present invention is:
The luminous colour purity of LED is very high, and the various colors wave band is to lean on different base materials to produce, and is the GaAs sill such as ruddiness, and yellow, green glow is the AlGaInP material, and blue light is the GaN sill, and ultraviolet is AlN or zno-based material.Every kind of color can be carried out the adjusting of certain limit through the doping level of quantum well again to wavelength.So the upper reaches producer of led chip can provide the led chip of different wave length.
In general the color that identifies of our human eye has relation with the dominant wavelength of light, so just can mix the secondary colour that produces in the middle of these wavelength through different wavelengths light, can produce orange-colored light such as ruddiness and yellow light mix, primaries mixing generation white light.We are exactly the chip with two kinds of different wave lengths in the same colour system in the present invention, produce a kind of dominant wavelength that we need.The luminous intensity of each chip follows the electric current through this chip to be directly proportional; The electric current that can regulate different chips like this makes the relativity of intensity of two kinds of wavelength chips, the centre wavelength of mixed light will be more near the wavelength of the bigger the sort of chip of luminous intensity.
If in the LED of different wave length luminescence chip circuit, add the temperature sensitive device of different temperatures characteristic, just can make the dominant wavelength of mixed light keep in the critical field according to the different luminous intensities of adjusting the different wave length led chips automatically of temperature.
Useful good effect of the present invention:
1, the present invention eliminates the LED signal optical source of color drift, and implementation is simple, has improved the reliability of LED signal lamp significantly.Make the LED signal optical source can both satisfy the requirement of chromaticity (spectrum) standard in whole working temperature section, simple and practical.Than the direct heating or the method for freezing, more reliable, also more can embody the energy conservation characteristic of LED.
2, the present invention eliminates the LED signal optical source of color drift, and simple in structure, cost is low, and is economical and practical, helps using and promoting of LED signal optical source, helps energy conservation.In the yellow signal circuit for lamp, adopt technical scheme of the present invention; Chromaticity is qualified during in order to ensure 70 ℃ of high temperature, and selecting the normal temperature wavelength is the LED luminescence chip test of 588nm and 607, records this LED signal lamp; According to top circuit, be easy to spend-40 ℃ environment chromaticity test through 70.
Description of drawings
Fig. 1: the present invention eliminates one of LED signal optical source schematic diagram of color drift;
Fig. 2: the present invention eliminate color drift LED signal optical source schematic diagram two;
Fig. 3: the present invention eliminate color drift LED signal optical source schematic diagram three.
Embodiment
The present invention eliminates the LED signal optical source of color drift; Contain more than two or two groups the LED luminescence chip or the luminous tube of different wave length in the color chromatogram of the same race at least; Connect the respectively resistance of different temperatures performance curve of the LED luminescence chip of the above different wave lengths of said two or two groups or luminous tube; And then be connected in parallel and insert in the constant-current source loop together; According to the LED luminescence chip of the different different wave lengths of adjustment automatically of temperature or the luminous intensities of luminous tube, the centre wavelength of mixed light is kept or more near the bigger the sort of LED luminescence chip of luminous intensity or the wavelength of luminous tube through said resistance.
The concrete mode of aforementioned techniques scheme that realizes comprises following several kinds:
One of which, the thermistor NTC of the negative temperature coefficient of LED luminescence chip that its medium wavelength is lower or luminous tube series connection, the thermistor PTC of the positive temperature coefficient of LED luminescence chip that wavelength is higher or luminous tube series connection;
Its two, the thermistor NTC of the LED luminescence chip that its medium wavelength is lower or luminous tube series connection negative temperature coefficient, LED luminescence chip that wavelength is higher or the luminous tube conventional resistance of connecting;
Its three, LED luminescence chip that its medium wavelength is lower or the luminous tube conventional resistance of connecting, the thermistor PTC of LED luminescence chip that wavelength is higher or luminous tube series connection positive temperature coefficient.
Following mask body combines accompanying drawing; With yellow led luminescence chip or luminous tube is example; Provide several specific embodiment of the present invention, contain the LED luminous tube of two kinds of different wave lengths in the yellow led signal optical source circuit, at the thermistor of said different wave length LED luminous tube series connection different temperatures performance.
Embodiment one: referring to Fig. 1.For yellow led luminescence chip or luminous tube; The LED luminous tube of wavelength in the low scope of 585nm～590nm or the thermistor NTC of luminous tube series connection negative temperature coefficient, the LED luminescence chip of wavelength in 600nm～605nm higher range or the thermistor PTC of luminous tube series connection positive temperature coefficient.
As shown in Figure 1, three LED power all are the chips of 1W, and LED1 and LED2 normal temperature wavelength are 588nm, and LED3 normal temperature wavelength is 603nm, LED1 and LED2 connect respectively negative tempperature coefficient thermistor NTC1 and NTC2, and model is 4D11; That LED3 connects is the thermistor PTC3 of positive temperature coefficient, and resistance is 3.4 ohm (WMZD-C300 that the magnificent huge electronics corporation in optional Nanjing produces).These three series circuits are connected in parallel and insert in the constant-current source circuit of 700mA.Three chips are all normally luminous during normal temperature, and centre wavelength is 595nm.
NTC1 and NTC2 resistance diminish when temperature is high, increase during current ratio normal temperature through LED1 and LED2, and luminous intensity increases; And the resistance of PTC3 becomes big, and the electric current through LED3 reduces relatively, and the LED3 luminous intensity reduces; The dominant wavelength deflection LED1 of mixed light and the wavelength that LED2 sends; High temperature makes that three LED emission wavelengths are all bigger than normal than normal temperature, and the wavelength that sends when LED1 and LED2 high temperature is about 593nm, and the wavelength that sends during LED3 high temperature is about 608nm; Mixed smooth dominant wavelength is 595nm, in the scope that the gold-tinted standard allows.
NTC1 and NTC2 resistance become big when temperature is-40 ℃, reduce the luminous intensity reduction during current ratio normal temperature through LED1 and LED2; And the resistance of PTC3 diminishes, and the electric current through LED3 increases relatively, and the LED3 luminous intensity strengthens; The wavelength that the dominant wavelength deflection LED3 of mixed light sends; Low temperature makes that three LED emission wavelengths are all less than normal than normal temperature, and the wavelength that sends when LED1 and LED2 high temperature is about 583nm, and the wavelength that sends during LED3 high temperature is about 600nm; Mixed smooth dominant wavelength is 595nm, in the scope that the gold-tinted standard allows.
Embodiment two: referring to Fig. 2.For yellow led luminescence chip or luminous tube; The LED luminous tube of wavelength in the low scope of 585nm～590nm or the thermistor NTC of luminous tube series connection negative temperature coefficient, wavelength LED luminescence chip or the luminous tube in the 600nm～610nm higher range conventional resistance of connecting.
As shown in Figure 2, three LED power all are the chips of 1W, and LED1 and LED2 normal temperature wavelength are 588nm, and LED3 normal temperature wavelength is 607nm, LED1 and LED2 connect respectively negative tempperature coefficient thermistor NTC1 and NTC2, and model is 4D11; What LED3 connected is conventional resistance, and resistance is 3.6 ohm.These three series circuits are connected in parallel and insert in the constant-current source circuit of 700mA.Three chips are all normally luminous during normal temperature, and centre wavelength is 595nm.
NTC1 and NTC2 resistance diminish when temperature is high, increase during current ratio normal temperature through LED1 and LED2, and luminous intensity increases; And reduce relatively through the electric current of LED3; The LED3 luminous intensity reduces, the dominant wavelength deflection LED1 of mixed light and the wavelength that LED2 sends, and high temperature makes that three LED emission wavelengths are all bigger than normal than normal temperature; The wavelength that sends when LED1 and LED2 high temperature is about 593nm; The wavelength that sends during LED3 high temperature is about 612nm, and mixed smooth dominant wavelength is 595nm, in the scope that the gold-tinted standard allows.
NTC1 and NTC2 resistance become big when temperature is-40 ℃, reduce the luminous intensity reduction during current ratio normal temperature through LED1 and LED2; And increase relatively through the electric current of LED3; The LED3 luminous intensity strengthens, the wavelength that the dominant wavelength deflection LED3 of mixed light sends, and low temperature makes that three LED emission wavelengths are all less than normal than normal temperature; The wavelength that sends when LED1 and LED2 high temperature is about 583nm; The wavelength that sends during LED3 high temperature is about 602nm, and mixed smooth dominant wavelength is 595nm, in the scope that the gold-tinted standard allows.
Embodiment three: referring to Fig. 3.For yellow led luminescence chip or luminous tube; LED luminous tube or the luminous tube of wavelength in the low scope of the 585nm～590nm conventional resistance of connecting, the LED luminescence chip of wavelength in 600nm～610nm higher range or the thermistor PTC of luminous tube series connection positive temperature coefficient.
As shown in Figure 3, three LED power all are the chips of 1W, and LED1 and LED2 normal temperature wavelength are 588nm, and LED3 normal temperature wavelength is 607nm, LED1 and LED2 connect respectively conventional resistance R 1 and R2, and resistance is 3.6 ohm; That LED3 connects is semistor PTC3, and resistance is 3.4 ohm.These three series circuits are connected in parallel and insert in the constant-current source circuit of 700mA.Three chips are all normally luminous during normal temperature, and centre wavelength is 595nm.
The PTC3 resistance becomes big when temperature is high, reduces during current ratio normal temperature through LED3, and luminous intensity weakens; And through LED1, the electric current of LED2 increases relatively, LED1; The LED2 luminous intensity increases, the wavelength that the dominant wavelength deflection LED3 of mixed light sends, and high temperature makes that three LED emission wavelengths are all bigger than normal than normal temperature; The wavelength that sends when LED1 and LED2 high temperature is about 593nm; The wavelength that sends during LED3 high temperature is about 612nm, and mixed smooth dominant wavelength is 595nm, in the scope that the gold-tinted standard allows.
When temperature PTC3 resistance for-40 ℃ the time diminishes, increase during current ratio normal temperature through LED3, luminous intensity increases; And through LED1, the electric current of LED2 reduces relatively, LED1; The LED2 luminous intensity weakens, the wavelength that the dominant wavelength deflection LED3 of mixed light sends, and low temperature makes that three LED emission wavelengths are all less than normal than normal temperature; The wavelength that sends when LED1 and LED2 high temperature is about 583nm; The wavelength that sends during LED3 high temperature is about 602nm, and mixed smooth dominant wavelength is 595nm, in the scope that the gold-tinted standard allows.
The LED signal optical source implementation method of the elimination color drift of above-mentioned each embodiment; All to select led chip with the colour system different wave length; Suitable thermistor and the conventional resistance of series connection resistance makes total electric current different according to temperature, reasonably distributes to the led chip of this different wave length; Let the led chip luminous intensity of different wave length have suitable ratio, in its mixed luminous dominant wavelength scope that just ability stationary value standard is permitted.Reach LED signal lamp glow color not with the purpose of temperature drift.
In the time of more than the LED luminescence chip of different wave length or luminous tube are two groups; Wherein every group of LED luminescence chip or luminous tube quantity are 1～N and do not wait; LED luminescence chip or the luminous tube wavelength of forming every group of LED luminescence chip or luminous tube are close; And the operating voltage of every group of LED luminescence chip or luminous tube coupling, said N is a natural number.
Claims (8)
1. LED signal optical source of eliminating color drift; Contain more than two or two groups the LED luminescence chip or the luminous tube of different wave length in the color chromatogram of the same race at least; It is characterized in that: connect the respectively resistance of different temperatures performance curve of the LED luminescence chip of the above different wave lengths of said two or two groups or luminous tube; And then be connected in parallel and insert in the constant-current source loop together; According to the LED luminescence chip of the different different wave lengths of adjustment automatically of temperature or the luminous intensities of luminous tube, the centre wavelength of mixed light is kept or more near the bigger the sort of LED luminescence chip of luminous intensity or the wavelength of luminous tube through said resistance.
2. the LED signal optical source of elimination color drift according to claim 1; It is characterized in that: the thermistor NTC of the negative temperature coefficient of LED luminescence chip that its medium wavelength is lower or luminous tube series connection, the thermistor PTC of the positive temperature coefficient of LED luminescence chip that wavelength is higher or luminous tube series connection.
3. the LED signal optical source of elimination color drift according to claim 2; It is characterized in that: for yellow led luminescence chip or luminous tube; The LED luminous tube of wavelength in 585nm～590nm scope or the thermistor NTC of luminous tube series connection negative temperature coefficient, the LED luminescence chip of wavelength in 600nm～605nm scope or the thermistor PTC of luminous tube series connection positive temperature coefficient.
4. the LED signal optical source of elimination color drift according to claim 1; It is characterized in that: the thermistor NTC of the LED luminescence chip that its medium wavelength is lower or luminous tube series connection negative temperature coefficient, LED luminescence chip that wavelength is higher or the luminous tube conventional resistance of connecting.
5. the LED signal optical source of elimination color drift according to claim 4; It is characterized in that: for yellow led luminescence chip or luminous tube; The thermistor NTC of LED luminous tube or the luminous tube series connection negative temperature coefficient of wavelength in 585nm～590nm scope, wavelength LED luminescence chip or the luminous tube in the 600nm～610nm scope conventional resistance of connecting.
6. the LED signal optical source of elimination color drift according to claim 1; It is characterized in that: LED luminescence chip that its medium wavelength is lower or the luminous tube conventional resistance of connecting, the thermistor PTC of LED luminescence chip that wavelength is higher or luminous tube series connection positive temperature coefficient.
7. the LED signal optical source of elimination color drift according to claim 6; It is characterized in that: for yellow led luminescence chip or luminous tube; LED luminous tube or the luminous tube of wavelength in the 585nm～590nm scope conventional resistance of connecting, the LED luminescence chip of wavelength in 600nm～610nm scope or the thermistor PTC of luminous tube series connection positive temperature coefficient.
8. according to the LED signal optical source of each described elimination color drift of claim 1～7; It is characterized in that: in the time of more than the LED luminescence chip of different wave length or luminous tube are two groups; Wherein every group of LED luminescence chip or luminous tube quantity are 1～N and do not wait; LED luminescence chip or the luminous tube wavelength of forming every group of LED luminescence chip or luminous tube are close, and the operating voltage of every group of LED luminescence chip or luminous tube coupling, and said N is a natural number.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10281128B2 (en) | 2015-05-19 | 2019-05-07 | Signify Holding B.V. | Lighting device comprising a split lighting engine |
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|---|---|---|---|---|
| CN1832168A (en) * | 2006-02-23 | 2006-09-13 | 华南师范大学 | Multi-chip high power LED device |
| CN102217416A (en) * | 2008-11-14 | 2011-10-12 | 欧司朗光电半导体有限公司 | Optoelectronic device |
| CN202425153U (en) * | 2012-01-12 | 2012-09-05 | 郑州朗睿科技有限公司 | LED (Light Emitting Diode) signal light source capable of effectively removing color drift |
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- 2012-01-12 CN CN2012100085208A patent/CN102595707A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1832168A (en) * | 2006-02-23 | 2006-09-13 | 华南师范大学 | Multi-chip high power LED device |
| CN102217416A (en) * | 2008-11-14 | 2011-10-12 | 欧司朗光电半导体有限公司 | Optoelectronic device |
| CN202425153U (en) * | 2012-01-12 | 2012-09-05 | 郑州朗睿科技有限公司 | LED (Light Emitting Diode) signal light source capable of effectively removing color drift |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10281128B2 (en) | 2015-05-19 | 2019-05-07 | Signify Holding B.V. | Lighting device comprising a split lighting engine |
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Application publication date: 20120718 |