CN106658873B - A kind of light color adjustable LED control system based on nonlinear closed loop - Google Patents
A kind of light color adjustable LED control system based on nonlinear closed loop Download PDFInfo
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- CN106658873B CN106658873B CN201710115846.3A CN201710115846A CN106658873B CN 106658873 B CN106658873 B CN 106658873B CN 201710115846 A CN201710115846 A CN 201710115846A CN 106658873 B CN106658873 B CN 106658873B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of light color adjustable LED control systems based on nonlinear closed loop, belong to technical field of LED illumination.The control system is made of microprocessor, LED drive control devices, cold, warm white LED string, illumination/color sensor, illuminance transducer, power module and corresponding control algolithm.Illumination/color sensor and illuminance transducer measurement dual-colored LED lamp string and ambient light signal control LED drive control devices driving LED light string to generate accurate light color adjustable output after control algolithm in microprocessor calculates.It is an object of the invention to realize the photochromic regulation and control of LED illumination System, to meet the lighting demand of variation and requirements at the higher level, it has been substituted into automatically in control algolithm because the factors such as ambient lighting, operating temperature, service life aging influence, it not only allows the precision higher of photochromic modulation, also substantially increases the utilization ratio of electric energy.
Description
Technical field
The patent of invention is related to technical field of LED illumination, refers in particular to a kind of light color adjustable LED based on nonlinear closed loop
Control system.
Background technology
Large-power light-emitting diodes (LED) have high-luminous-efficiency, low energy consumption, more environmentally friendly and more long service live, simultaneously
There is the characteristic easily modulated.The market penetration rate of LED illumination is continuously increased in recent years, wide market, it has also become substitution tradition
The next-generation lighting source of fluorescent lamp and incandescent lamp.At present, the main problem that LED illumination faces is in intensity of illumination and phase
The needs in terms of colour temperature (correlated color temperature, CCT) uniformity are closed, in such as hotel, museum, are drilled
The regions such as room, operating room are broadcast in application, the photochromic holding of LED illumination System is required to stablize.Due to aging and immediately the work changed
Make condition, even the same model LED that same manufacturer provides can generate the inconsistent spectrum with time drift, especially
It is that the variation of environment temperature can cause significant emitting light flux to change and CCT differences.Therefore provide invariant in time
Stable light output and CCT values of stablizing illuminate particularly important.Another problem of LED illumination is in household, the superfine region application of business
When, it is necessary to variable illumination and CCT be provided according to lighting demand, to adapt to the demand of different scenes.
It solves the problems, such as that two above is required for LED illumination System that can realize exit luminous flux and adjustable color, uses at present
Scheme be that combination lighting system (also referred to as dual-colored LED lamp) is formed by warm white and cool white light LED light string simultaneously, by adjusting two
The light extraction ratio of kind LED light string, realizes photochromic stabilization or the mixing light output of photochromic variation.Such as in patent of invention：A kind of LED
Color temperature adjusting system and method (application number 201110389680.7), a kind of Dimmable LED lamps and lanterns and its light modulating device, light modulation system
It unites (application number 201510928982.5), the current this adjustable dual-colored LED lamp (application number of light color adjustable LED lamp
201510714660.0) etc. have it is mentioned.Related product is already present in the day in such as operating room's illumination, hotel and museum
The high-end application fields such as the illumination of card lamp, photo illumination.However, above-mentioned all technologies and product are all based on simple linear control
Method processed, use is cold, warm white LED color temperature constant it is assumed that directly giving the pulsewidth modulation (pulse of changes in temperature dual-colored LED lamp
Width modulation, PWM) signal controls light output and correlated colour temperature, and there is no shine spy in view of actual influence LED
Non-linear factor between the multi-parameter of property.For example the variation of LED light input power can cause the variation of light intensity and junction temperature, otherwise again
Cause the displacement of colour temperature.So traditional dual-colored LED lamp can not provide accurate light intensity regulating and CCT controls.
Therefore, it is necessary to a kind of nonlinear closed-loop control system, brightness and the CCT of dual-colored LED lamp can be accurately adjusted, with
It solves the problems, such as above-mentioned to run into practical operation.
The content of the invention
The purpose of patent of the present invention is in place of solving deficiencies of the prior art, provides a kind of based on non-linear
The light color adjustable LED control system of closed loop using two close cycles nonlinear Control mode, realizes that cold, warm white LED lamp is completely independent
Under accurate luminous intensity and CCT control, so as to obtain better illuminating effect.
In order to achieve the above object, the present invention uses following technical solution：
A kind of light color adjustable LED control system based on nonlinear closed loop including microprocessor, LED drive control devices, warms up
White light LEDs string, cool white light LED strings, illumination/color sensor, illuminance transducer, power module；The microprocessor connection
Two constant-current LED drive control devices, one of LED drive control devices control warm white LED string, another LED drive control
Device control cool white light LED strings, microprocessor generate the pwm signal R of two-way different dutywAnd Rc, it is respectively used to adjust warm white
LED goes here and there and the output of cool white light LED strings；
The illuminance transducer measuring environment background illumination intensity, result of detection input microprocessor are simultaneously converted to environment
Luminous flux；
Illumination/the color sensor continues to monitor warm white LED string and cool white light LED under the conditions of Closed loop operation
String, output is cold, effective luminous flux and rgb value after warm white mixed light, measures luminous flux and rgb value feeds back to microprocessor,
Middle rgb value can calculate measurement CCT values, and microprocessor will measure luminous flux and measure CCT values and the target/ambient light inputted before
Flux and target CCT values are compared, and the duty cycle R of subsequent time pwm signal is calculated by built-in control algolithmwAnd Rc。
Further, the built-in control algolithm is summarized as follows：
It is respectively φ to take cold i moment, luminous flux of warm white LED and CCT valuesc、φwAnd Cc、Cw, total light leads to after mixed light
Measure φmAnd CmIt is represented by：
Wherein φaFor ambient light fluxes, φ can be obtained by formula (1)wAnd φc,
(i+1) the pwm signal duty cycle R at momentw(i+1) and Rc(i+1) calibration should consider to measure luminous flux and target respectively
Luminous flux and measurement CCT values and target CCT values it is inconsistent, by changing φcAnd φwTo reach target light flux φtAnd mesh
Mark CCT values Ct；By (2) formula, because measurement luminous flux and target light flux are inconsistent, cold, the warm white LED output that are generated after calibration
Light leads to variable quantity,
Similar, because measurement CCT values and target CCT values are inconsistent, cold, warm white LED output light leads to variable quantity and is,
By formula (3), (4), the light that (i+1) moment is cold with respect to the k moment, warm white is total leads to variable quantity and is,
So pwm signal duty cycle R at (i+1) momentw(i+1) and Rc(i+1) it is,
Wherein αwAnd αcFor proportionality constant, can be measured by experiment；Formula (6) is nonlinear closed loop's governing equation.
Further, in order to improve the speed of service of system and reduce cost, cold, warm white LED duty cycle is calculated into knot
Fruit is made in form deposit microprocessor, during system operation, is passed through immediate two groups of data values in tabling look-up, is carried out linear interpolation
Computing obtains actual control duty cycle.
Further, the power module provides electric energy for microprocessor and two constant-current LED drive control devices.
The invention has the advantages that：
1st, compared to existing linear control method, even if ambient lighting and temperature change, nonlinear closed loop control
Algorithm can still provide accurate light modulation toning output.
2nd, in the entire life cycle of LED light string, the shadow that toning result declines from LED light with control circuit aging is dimmed
It rings.
3rd, the luminosity of the system and colour temperature can be conducive to save energy consumption according to the weak automatic Modulation of environmental background light intensity.
Description of the drawings
In order to illustrate the embodiments of the present invention more clearly or technical solution, the present invention is made with reference to the accompanying drawings and examples
It further illustrates.
Fig. 1 is a kind of light color adjustable LED control system structure diagram based on nonlinear closed loop.
Fig. 2 algorithm flow charts in order to control.
Fig. 3 is the LED lamp bead arrangement mode of embodiment 1 and illumination/color sensor location arrangements structure diagram.
Fig. 4 is the LED lamp bead arrangement mode of embodiment 2 and illumination/color sensor location arrangements structure diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is illustrated.
As shown in Figure 1, 2, microprocessor inputs target light flux and target CCT values first, then obtains and is passed from illumination
The environmental background luminous flux of sensor.After cold, warm white LED string is lighted, illumination/color sensor measures dual-colored LED string respectively
Luminous flux and rgb value, and be sent into microprocessor.Microprocessor calculates measurement CCT values by measuring rgb value, will measure
Luminous flux and measurement CCT values are compared with the target/ambient light fluxes and target CCT values that obtain before, using built-in non-thread
Property closed loop control algorithm be obtained subsequent time adjustment after cold, warm white LED string PWM drive signal duty cycle RcAnd Rw.The two
Pwm signal is sent into two paths of LED drive control device, changes the output light flux of dual-colored LED lamp string, illumination can be achieved after successive ignition
System illumination and the accuracy controlling of colour temperature.Even if because of ambient lighting and environment temperature change or driving circuit aging and LED light
Pearly-lustre, which declines, causes the luminous intensity of dual-colored LED lamp string and luminescent spectrum to generate and drift about, which remains to protect
The accuracy for demonstrate,proving luminous flux and colour temperature adjusting is constant.In view of the larger calculation amount of control algolithm and memory space requirements, in order to
It improves the iterative calculation speed of control system and reduces cost, result of calculation can be also made in form deposit microprocessor.According to
During bright system operation, microprocessor, which is tabled look-up, finds immediate two groups of data values, and progress linear interpolation obtains required wherein
Cold, warm white LED drive signal duty cycle.
In order to make measurement luminous flux and measurement CCT values accurate enough, LED lamp bead arrangement mode and illumination/color sensor
Relative position is extremely important.Fig. 3 embodiments 1 provide the structure of a kind of LED lamp bead distribution and illumination/color sensor relative position
Schematic diagram.In figure, light square represents cool white light LED lamp bead (colour temperature 6500K), and darkened boxes represent warm white LED lamp bead (color
Warm 2700K).The dress arrangement of dual-colored LED lamp bead crossed loops, circle centre position are illumination/color sensor, which is suitable for LED
The lamps and lanterns of the types such as lamp, LED spotlight.
Fig. 4 embodiments 2 provide the structure diagram of another LED lamp bead distribution and illumination/color sensor relative position.
In figure, LED package substrate is rectangle, and cold, warm white LED lamp bead cross matrix arrangement, illumination/color sensor is located at encapsulation base
At the center of plate, which is suitable for the lamps and lanterns of the types such as LED flat lamp, LED street lamp, LED floodlight that side shines.
It should be pointed out that specific embodiment described above can make those skilled in the art that this hair be more fully understood
It is bright, but do not limit the invention in any way.Therefore, although this specification has carried out the present invention in detail referring to the drawings with embodiment
Thin explanation, it will be understood by those skilled in the art, however, that still can modify or equivalently replace the present invention, always
It, all do not depart from the technical solution of the spirit and scope of the invention and its improvement, should all cover in the invention
Within the protection domain of patent.
Claims (3)
1. a kind of light color adjustable LED control system based on nonlinear closed loop, including microprocessor, constant-current LED drive control device,
Warm white LED string, cool white light LED strings, illumination/color sensor, illuminance transducer, power module, it is characterised in that：
The microprocessor connects two constant-current LED drive control devices, and one of constant-current LED drive control device controls warm white
Light LED goes here and there, another constant-current LED drive control device control cool white light LED strings, microprocessor generates two-way different duty
Pwm signal RwAnd Rc, it is respectively used to adjust the output of warm white LED string and cool white light LED strings；
The illuminance transducer measuring environment background illumination intensity, result of detection input microprocessor are simultaneously converted to ambient light and lead to
Amount；
Illumination/the color sensor continues to monitor warm white LED string and cool white light LED strings under the conditions of Closed loop operation, defeated
Go out effective luminous flux and rgb value cold, after warm white mixed light, measure luminous flux and rgb value feeds back to microprocessor, wherein RGB
Value can calculate measurement CCT values, and microprocessor will measure luminous flux and measure CCT values and the target/ambient light fluxes inputted before
It is compared with target CCT values, the duty cycle R of subsequent time pwm signal is calculated by built-in control algolithmwAnd Rc；
The built-in control algolithm is summarized as follows：
It is respectively φ to take cold i moment, luminous flux of warm white LED and CCT valuesc、φwAnd Cc、Cw, total luminous flux φ after mixed lightm
And CmIt is represented by：
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Logical variable quantity is,
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So pwm signal duty cycle R at (i+1) momentw(i+1) and Rc(i+1) it is,
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>R</mi>
<mi>w</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>k</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mi>R</mi>
<mi>w</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>k</mi>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&alpha;</mi>
<mi>w</mi>
</msub>
<mfrac>
<mrow>
<msub>
<mi>&phi;</mi>
<mi>m</mi>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>C</mi>
<mi>c</mi>
</msub>
<mo>-</mo>
<msub>
<mi>C</mi>
<mi>t</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&phi;</mi>
<mi>t</mi>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>C</mi>
<mi>m</mi>
</msub>
<mo>-</mo>
<msub>
<mi>C</mi>
<mi>c</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>C</mi>
<mi>c</mi>
</msub>
<mo>+</mo>
<msub>
<mi>C</mi>
<mi>w</mi>
</msub>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>R</mi>
<mi>c</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>k</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mi>R</mi>
<mi>c</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>k</mi>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&alpha;</mi>
<mi>c</mi>
</msub>
<mfrac>
<mrow>
<msub>
<mi>&phi;</mi>
<mi>m</mi>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>C</mi>
<mi>t</mi>
</msub>
<mo>-</mo>
<msub>
<mi>C</mi>
<mi>w</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&phi;</mi>
<mi>t</mi>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>C</mi>
<mi>w</mi>
</msub>
<mo>-</mo>
<msub>
<mi>C</mi>
<mi>m</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>C</mi>
<mi>c</mi>
</msub>
<mo>-</mo>
<msub>
<mi>C</mi>
<mi>w</mi>
</msub>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>6</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein αwAnd αcFor proportionality constant, can be measured by experiment；Formula (6) is nonlinear closed loop's governing equation.
2. a kind of light color adjustable LED control system based on nonlinear closed loop according to claim 1, it is characterised in that：
In order to improve the speed of service of system and reduce cost, form is made in cold, warm white LED duty cycle result of calculation and is stored in micro- place
It manages in device, during system operation, by immediate two groups of data values in tabling look-up, carries out linear interpolation arithmetic and obtain actual control to account for
Empty ratio.
3. a kind of light color adjustable LED control system based on nonlinear closed loop according to claim 1, it is characterised in that：
The power module provides electric energy for microprocessor and two constant-current LED drive control devices.
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| CN107896401A (en) * | 2017-12-15 | 2018-04-10 | 中国四联仪器仪表集团有限公司 | A kind of museum lighting drive dynamic control device, system and method |
| CN108235517B (en) * | 2018-01-25 | 2020-10-27 | 深圳民爆光电股份有限公司 | Lighting driving device for protecting eyesight |
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| CN110708794A (en) * | 2019-09-29 | 2020-01-17 | 天一照明（深圳）有限公司 | LED dimming method and device and LED lighting lamp |
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| CN113613364B (en) * | 2021-10-08 | 2022-01-25 | 东莞锐视光电科技有限公司 | Method and system for controlling light source based on light source controller |
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| CN104602412A (en) * | 2015-01-15 | 2015-05-06 | 张家港麦智电子科技有限公司 | Environmental temperature based variable color temperature LED lighting system |
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