CN101697654A - Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors - Google Patents
Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors Download PDFInfo
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Abstract
The invention discloses a correlated color temperature and color rendering index self-calibration circuit of an LED light source consisting of light of multiple colors, comprising a data storage circuit, a light sensor circuit, an input circuit and a master control computing circuit, wherein the data storage circuit stores each light color LED light flux forming an LED light source or a light intensity-current curve and correlated color temperature and color rendering index-light flux or light intensity ratio curve and sends the two sets of data to the master control computing circuit; the light sensor circuit is used for sensing light signals of a light source window and sending the light signals to the master control computing circuit; the input circuit is used for setting up correlated color temperature and color rendering indexes and sending the correlated color temperature and color rendering indexes to the master control computing circuit; the master control computing circuit utilizes the two curves to establish an internal database, converts the light signals of the light sensor circuit into light flux or light intensity actually sent out by an LED by the database and sends out a corresponding control signal to an LED constant current drive circuit according to the set correlated color temperature and color rendering index, thereby enabling the LED of each light color to regulate the light flux or light intensity ratio.
Description
Technical field
The present invention relates to LED and drive and the control field, specifically disclose a kind of correlated colour temperature and color rendering index self-calibration circuit of how photochromic LED light source consisting.
Background technology
LED, just light-emitting diode is a kind of solid-state light emitting semiconductor device.After high-power white light LEDs occurs because it has luminous efficiency height, good energy-conserving effect, pollution-free, characteristics such as the life-span is long, be described as replace incandescent and fluorescent lamp the 4th generation lighting source, be subjected to paying close attention to widely.
The core of LED is the led chip that is encapsulated in the inside, and led chip generally can only send the monochromatic light of specific wavelength.So, white light LEDs will produce white light has three kinds of modes to realize: 1. blue-light LED chip adds gold-tinted fluorescent material (generally being YAG fluorescent material), excite coating gold-tinted fluorescent material above it by blue-light LED chip, fluorescent material be excited gold-tinted that the back produces with remaining blue light complementary and generation white light; 2. utilize the principle of three primary colours together, red blue green light is mixed produce white light three kinds of ultra-high brightness LED Chip Packaging of RGB; 3. blue-light LED chip adds green light fluorescent powder and red light fluorescent powder, excites coating green light fluorescent powder and red light fluorescent powder above it by blue-light LED chip, and fluorescent material is excited back green glow that produces and ruddiness and the complementation of remaining blue light and produces white light; 4. ultraviolet light or purple light (300-400nm) led chip adds RGB fluorescent material, the principle of luminosity of its principle and fluorescent lamp is similar, excite coating RGB fluorescent material above it by ultraviolet light or purple LED chip, the blue light, green glow and the ruddiness that produce after fluorescent material is excited mix and the living white light of shape.At present, the white light LEDs of preceding dual mode is the most common, and the white light LEDs of " blue-light LED chip+YAG fluorescent material " is applied in lighting field more, has the high advantage of light efficiency; The white light LEDs of " RGB " is applied on backlight, the display screen more, and it is wide to have colour gamut, and color rendering is advantage preferably.
Led light source will become the leading role of lighting field gradually in future, except the luminous efficiency that improves self, also need to improve its light source quality.The important parameter of reflection light source quality has chromaticity coordinate, correlated colour temperature CT and color rendering index CRI (comprising general colour rendering index and special colour rendering index).Chromaticity coordinate, correlated colour temperature and color rendering index are determined by the LED spectral power distribution.
Traditional incandescent lamp, its spectral energy comprise all continuous spectrums of visible light; And the white light that white light LEDs produces is to be mixed by multiple monochromatic light, and spectral power distribution presents shaped like narrow.This species diversity of white light LEDs and conventional incandescent has caused the color rendering index of white light LEDs not high, and there is luminous efficiency problem on the low side when hanging down correlated colour temperature, thereby limited to the light source quality, having limited white light LEDs needs the application of high colour developing quality occasion at some.
For regulating the correlated colour temperature of led light source, improve its color rendering index, an effective method is to replenish and regulate the color radiation that lacks in the spectrum.This has two technology paths to realize in practical operation: first, improve fluorescent material, in YAG fluorescent material, add the fluorescent components (as patent CN 1677695A, CN 101414604A and CN 101195742A) of other colors such as ruddiness, green glow or the multilayer fluorescent material mode (as patent CN 1953216A) that adopts the YAG phosphor powder layer to combine usually with ruddiness, green light fluorescent powder layer; The second, simultaneously integrated white light LEDs and color LED (as patent CN 101255956A) have perhaps encapsulated White-light LED chip and color LED chip (as patent CN1937222A) in same LED in encapsulation.For preceding kind of method, the problem that exists luminous efficiency to be difficult to promote, ruddiness, green light fluorescent powder cause the decline of overall light efficiency to the absorption of blue light.In addition, after the formed product, correlated colour temperature and color rendering index just can not change.For a kind of method in back, guaranteeing that high luminous efficiency simultaneously, improve the color rendering of light source, and in use, only need to adjust the electric current of certain color LED, change its luminous flux (or light intensity), just can change correlated colour temperature and color rendering index, but this method needs configuration driven control circuit and respective algorithms.For example:
Patent (CN 1968556A) discloses a kind of system and method that is used to generate white light, and this system comprises fluorescent material conversion White LED and non-fluorescent material conversion chromatic LED, also has color sensor.Wherein color sensor is a three-colour sensor, only generates the feedback signal specific to color, and produces control signal corresponding producing desired color from light source, thereby regulates the brightness and the colorimetric properties of light source.This system relative complex, special three-colour sensor only responds and particular color, if the color LED kind or the wavelength shift that adopt, transducer will be made corresponding adjustment.
At the light source that how photochromic LED forms, make it be applied in the lighting field that high colour developing requires, need a kind of correlated colour temperature and color rendering index self-calibration means and Circuits System of simple general-purpose.
Summary of the invention
At the shortcoming of prior art, the purpose of this invention is to provide a kind of correlated colour temperature and color rendering index self-calibration circuit of how photochromic LED light source consisting, it uses correlated colour temperature and the color rendering index of each photochromic luminous flux (or light intensity) ratio from regulation light source first; First aging curve is incorporated into the self calibration system, improves the time stability of light source colorimetric parameter.
For achieving the above object, technical scheme of the present invention is: a kind of correlated colour temperature of how photochromic LED light source consisting and color rendering index self-calibration circuit, and it comprises LED constant-current drive circuit, optical sensor circuit, data storage circuitry, input circuit and master control counting circuit;
Data storage circuitry has each photochromic LED luminous flux or light intensity-current curve and correlated colour temperature and the color rendering index-luminous flux or the beam intensity ratio curve of LED light source consisting, and these two groups of data are sent to the master control counting circuit; Optical sensor circuit is used for the light signal of induction light source window, and light signal is sent to the master control counting circuit; Input circuit is used to be provided with correlated colour temperature and color rendering index, and sends it to the master control counting circuit; The master control counting circuit, it utilizes above-mentioned two curves to set up internal database, by this database the light signal of optical sensor circuit is converted into actual luminous flux that sends of LED or light intensity, and send corresponding control signal according to the correlated colour temperature of setting and color rendering index and give the LED constant-current drive circuit, make each photochromic LED adjust its luminous flux or light intensity ratio.
General optical sensor can only be in response to the light energy that is radiated at its receive window, and can't learn the actual luminous flux that sends of LED (total light energy of sending).For accurately obtaining luminous flux or the light intensity that LED sends, the present invention deposits into data storage circuitry to each photochromic LED luminous flux or light intensity-current curve, and data storage circuitry is exported to the master control counting circuit to this curve data again.
Optical sensor circuit is connected in the master control counting circuit, and its response signal is transferred to the master control counting circuit.The master control counting circuit is set up the internal conversion database of optical sensor response signal and LED luminous flux or light intensity automatically by primary control program when light fixture is lighted, learn luminous flux or the light intensity that LED sends in the light source by inquiry mode.
Along with wearing out of LED, can cause the change of LED luminous flux or light intensity-current curve, the change degree is influenced by LED operating time and working temperature.For addressing the above problem, this circuit has also comprised self-calibration circuit and temperature sensor circuit, and temperature sensor circuit is connected in self-calibration circuit, and self-calibration circuit is connected in data storage circuitry and master control counting circuit.Data storage circuitry is transferred to self-calibration circuit to the light decay curve data, and meanwhile, temperature sensor circuit is surveyed the LED working temperature, and temperature signal is transferred to self-calibration circuit.Self-calibration circuit utilizes this two groups of data, and inner conversion database is revised.Utilize the method, the master control counting circuit just can accurately calculate actual luminous flux that sends of LED or light intensity by the feedback signal of optical sensor circuit, especially using a segment length after the time, also can keep the accuracy of calculating.In addition, temperature sensor circuit can be used to control the working temperature of LED in conjunction with the adjustable power heat abstractor of periphery, expands the purposes of this circuit greatly.
Data storage circuitry is transferred to the master control counting circuit to correlated colour temperature/color rendering index-luminous flux or beam intensity ratio curve data, luminous flux or light intensity ratio that the master control counting circuit inquires needs according to the correlated colour temperature of setting and color rendering index, and change into control signal corresponding and be transferred to the LED constant-current drive circuit.Self-calibration circuit is also revised above-mentioned conversion process, guarantees that actual value and set point are identical.Said process can be finished by program control when turning on light automatically.
If color is more than two kinds, then correlated colour temperature/color rendering index-luminous flux or beam intensity ratio graph of a relation then become three-dimensional, but above-mentioned inquiry and modification method are constant.
In addition, input circuit offers correlated colour temperature and the color rendering index that the user sets to be needed, and set point is transferred to the master control counting circuit.
Compared with prior art, the present invention has following benefit: with the luminous flux (or light intensity) of LED in the light source as feedback quantity and controlled quentity controlled variable, by correlated colour temperature and the color rendering of optimum luminous flux (or light intensity) proportion technique from regulation light source, wherein, optimum luminous flux (or light intensity) ratio is drawn by simulation or experiment, guarantees self-alignment objectivity; Aging curve is introduced in the circuit, eliminated the self calibration error that LED uses the back parameter change to cause for a long time; Whole self-calibration process is finished when the bright lamp automatically by the master control calculation procedure, and is easy to use; This circuit and method energy flexible Application as " white+redness ", " white+amber+green " etc., are improved correlated colour temperature stability in the led light source of various how photochromic composition, improve the colour developing quality.
Description of drawings
Fig. 1 is the system diagram and the data flow of how photochromic LED light source consisting correlated colour temperature and color rendering index self-calibration circuit;
Under the different red light peak wavelength of Fig. 2, the two-dimentional relation figure of color rendering index and red white light luminous flux or beam intensity ratio;
Under the different red light peak wavelength of Fig. 3, the two-dimentional relation figure of correlated colour temperature and red white light luminous flux or beam intensity ratio;
Fig. 4 is the correlated colour temperature self-calibration circuit schematic diagram of " white light+ruddiness " led light source among the embodiment 1;
Fig. 5 is that the correlated colour temperature of " white light+ruddiness+green glow " led light source among the embodiment 3 is adjustable, high-color rendering self-calibration circuit schematic diagram;
Fig. 6 is that room lighting environmental correclation colour temperature is regulated schematic diagram.
Embodiment
As shown in Figure 1, the invention provides a kind of correlated colour temperature and color rendering index self-calibration circuit of how photochromic LED light source consisting, it comprises LED constant-current drive circuit (6), optical sensor circuit (3), data storage circuitry (1), input circuit (7) and master control counting circuit (2);
Data storage circuitry (1), have each photochromic LED luminous flux of LED light source consisting or light intensity-current curve 2. with correlated colour temperature and color rendering index-luminous flux or beam intensity ratio curve 3., and these two groups of data are sent to master control counting circuit (2);
Optical sensor circuit (3) is used for the light signal of induction light source window, and light signal is sent to master control counting circuit (2);
Input circuit (7) is used to be provided with correlated colour temperature and color rendering index, and sends it to master control counting circuit (2);
Master control counting circuit (2), it utilizes above-mentioned two curves to set up internal database, by this database the light signal of optical sensor circuit (3) is converted into actual luminous flux that sends of LED or light intensity, and send corresponding control signal according to the correlated colour temperature of setting and color rendering index and give LED constant-current drive circuit (6), make each photochromic LED adjust its luminous flux or light intensity ratio.
Also comprise the self-calibration circuit (4) that signal is revised, this self-calibration circuit (4) is used to revise master control counting circuit (2) and issues the control signal and the optical sensor circuit (3) of LED constant-current drive circuit (6) and issue the light signal of master control counting circuit (2).Also comprise the temperature sensor circuit (5) that is connected in self-calibration circuit (4), it is used to survey the working temperature of LED and temperature signal data is transferred to self-calibration circuit (4), this data storage circuitry (1) with its light decay curve that prestores 1. data be sent to self-calibration circuit (4), self-calibration circuit (4) is revised the internal database of master control counting circuit (2) by these two groups of data.
Master control counting circuit (2) has three-dimensional correlated colour temperature and color rendering index-luminous flux or beam intensity ratio curve internal database 3. by foundation, adjusts the correlated colour temperature and the color rendering index of the light source of two or more color LED compositions.Fig. 2 and Fig. 3 are the situations of two kinds of colors, and more than two kinds, then correlated colour temperature/color rendering index-luminous flux or beam intensity ratio graph of a relation then become three-dimensional as if color, but above-mentioned inquiry and modification method are constant.
The photochromic LED luminous flux of each of LED light source consisting or light intensity-current curve 2., the light decay curve 1. and correlated colour temperature/color rendering index-luminous flux or beam intensity ratio curve 3. draw by simulation or experiment.
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
Embodiment 1
As shown in Figure 4, the correlated colour temperature self-calibration circuit and the method for a kind of " white light LEDs+red-light LED " light source, because light source contains white light and two kinds of LED of ruddiness, so this circuit comprises two groups of constant-current drive circuits 1 and 2, drive white light LEDs and red-light LED respectively, can accurately control its luminous flux (or light intensity).Other parts of circuit are formed identical with the foregoing invention content.
At first, as described in above-mentioned summary of the invention, the master control counting circuit is set up the conversion database of optical sensor feedback signal and white light luminous flux (or light intensity), and the response signal by optical sensor circuit just can calculate the luminous flux (or light intensity) that white light LEDs sends.Data storage circuitry is transferred to the master control counting circuit to correlated colour temperature-red white light luminous flux (or light intensity) than curve data, and the master control counting circuit calculates the corresponding proportion of ruddiness luminous flux (or light intensity) according to required correlated colour temperature.At this moment, master control counting circuit output control signal corresponding is given LED constant-current drive circuit 2, makes the luminous flux (or light intensity) of ruddiness reach required ratio.This process needs self-calibration circuit to carry out self calibration simultaneously.
Present embodiment is applicable to the LED lighting source that correlated colour temperature is adjustable.Optical sensor, white light LEDs and red-light LED are integrated in the light source together, and light-source brightness can change by the electric current of regulating white light LEDs.Simultaneously, utilize this patent method, the luminous flux (or light intensity) that white light is followed in ruddiness brightness meeting changes pro rata, thus the correlated colour temperature value that under different brightness, also can keep the user to set.For low-power light source (as the desk lamp below 10 watts), by rational heat dissipation design, the working temperature of LED is controlled in the certain limit easily.For this kind situation, can save the use of temperature sensor, working temperature is preestablished and measures and deposit in the self-calibration circuit, so just reduce the complexity and the cost of system.
Embodiment 2
The high-color rendering holding circuit of a kind of " white light LEDs+red-light LED " light source, its system's formation is similar to embodiment 1 with Principles of Regulation.Different is, data storage circuitry is transferred to the master control counting circuit to color rendering index-red white light luminous flux (or light intensity) than curve data, and the master control counting circuit is found the best proportion of required ruddiness luminous flux (or light intensity) according to high color rendering index (CRI) point.
This holding circuit is applicable to the various white light LEDs on the market, white light LEDs for difference encapsulation and different model, only need to select suitable red-light LED, can make the white light LEDs light fixture of a high color rendering index (CRI), conveniently be applied in the occasion that to light source colour developing has high request.
As shown in Figure 5, the correlated colour temperature of a kind of " white light LEDs+red-light LED+green light LED " light source is adjustable, the high-color rendering self-calibration circuit.Above-mentioned two examples of implementation are self calibration correlated colour temperature or color rendering index separately.If need self calibration correlated colour temperature and two indexs of color rendering index simultaneously, then need in led light source, add a kind of color more.Therefore, present embodiment has used three groups of constant-current drive circuits 1,2 and 3, drives white light LEDs, red-light LED and green light LED respectively, can for a change in the correlated colour temperature, still keep high-color rendering the people.
Different with above-mentioned two examples of implementation is, data storage circuitry is transferred to the master control counting circuit to color rendering index-luminous flux (or light intensity) than data set and correlated colour temperature-luminous flux (or light intensity) than data set simultaneously, the master control counting circuit is according to correlated colour temperature and the color rendering index set, in two data sets, set up intersection area, draw ruddiness luminous flux (or light intensity) and green glow luminous flux (or light intensity) ratio.
This circuit can improve display effect as the control circuit in LED-backlit source.
Embodiment 4
As shown in Figure 6, be that the correlated colour temperature self-calibration circuit is applied in the room lighting environment.How photochromic led light source (1), optical sensor circuit (2) and input circuit (3) are installed in indoor, the user is by input circuit (3) set environment correlated colour temperature, utilize described Circuits System of foregoing invention content and method, can carry out effective self calibration the environmental correclation colour temperature.
Claims (5)
1. the correlated colour temperature of photochromic LED light source consisting and color rendering index self-calibration circuit more than one kind is characterized in that: comprise LED constant-current drive circuit (6), optical sensor circuit (3), data storage circuitry (1), input circuit (7) and master control counting circuit (2);
Data storage circuitry (1), have each photochromic LED luminous flux of LED light source consisting or light intensity-current curve 2. with correlated colour temperature and color rendering index-luminous flux or beam intensity ratio curve 3., and these two groups of data are sent to master control counting circuit (2);
Optical sensor circuit (3) is used for the light signal of induction light source window, and light signal is sent to master control counting circuit (2);
Input circuit (7) is used to be provided with correlated colour temperature and color rendering index, and sends it to master control counting circuit (2);
Master control counting circuit (2), it utilizes above-mentioned two curves to set up internal database, by this database the light signal of optical sensor circuit (3) is converted into actual luminous flux that sends of LED or light intensity, and send corresponding control signal according to the correlated colour temperature of setting and color rendering index and give LED constant-current drive circuit (6), make each photochromic LED adjust its luminous flux or light intensity ratio.
2. the correlated colour temperature of according to claim 1 how photochromic LED light source consisting and color rendering index self-calibration circuit, it is characterized in that: also comprise the self-calibration circuit (4) that signal is revised, this self-calibration circuit (4) is used to revise master control counting circuit (2) and issues the control signal and the optical sensor circuit (3) of LED constant-current drive circuit (6) and issue the light signal of master control counting circuit (2).
3. the correlated colour temperature of according to claim 2 how photochromic LED light source consisting and color rendering index self-calibration circuit, it is characterized in that: also comprise the temperature sensor circuit (5) that is connected in self-calibration circuit (4), it is used to survey the working temperature of LED and temperature signal data is transferred to self-calibration circuit (4), this data storage circuitry (1) with its light decay curve that prestores 1. data be sent to self-calibration circuit (4), self-calibration circuit (4) is revised the internal database of master control counting circuit (2) by these two groups of data.
4. the correlated colour temperature of according to claim 1 how photochromic LED light source consisting and color rendering index self-calibration circuit, it is characterized in that: master control counting circuit (2) has three-dimensional correlated colour temperature and color rendering index-luminous flux or beam intensity ratio curve internal database 3. by foundation, adjusts the correlated colour temperature and the color rendering index of the light source of two or more color LED compositions.
5. the correlated colour temperature of according to claim 1 how photochromic LED light source consisting and color rendering index self-calibration circuit is characterized in that: the photochromic LED luminous flux of each of LED light source consisting or light intensity-current curve 2., the light decay curve 1. and correlated colour temperature/color rendering index-luminous flux or beam intensity ratio curve 3. draw by simulation or experiment.
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