CN109462913A - A kind of control method and system optimizing lamp bead spectrum - Google Patents
A kind of control method and system optimizing lamp bead spectrum Download PDFInfo
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- CN109462913A CN109462913A CN201811252553.0A CN201811252553A CN109462913A CN 109462913 A CN109462913 A CN 109462913A CN 201811252553 A CN201811252553 A CN 201811252553A CN 109462913 A CN109462913 A CN 109462913A
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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]
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Abstract
The present invention provides a kind of control method and system for optimizing lamp bead spectrum, and the control method of the optimization lamp bead spectrum is the following steps are included: step S1, inputs the spectral characteristic of each LED light emitting device in lamp bead；Step S2 calculates the included angle cosine value between lamp bead reality output spectrum and the target optical spectrum according to the output demand of target optical spectrum, and corresponding reality output spectrum is spectrum calculated value when taking the included angle cosine value closest to 1；Step S3 controls the forward current intensity of each LED light emitting device in the lamp bead by the spectrum calculated value.The present invention had both been able to satisfy the output total value of spectrum required for target optical spectrum, the spectrum calculated value of the similarity degree between reality output spectrum and target optical spectrum can be improved as far as possible again, the target optical spectrum that the present invention can rapidly be needed using the output of existing LED lamp bead, it is at low cost, period is short, the purposes that LED lamp bead can have been expanded well, meets the individual demand of user.
Description
Technical field
The present invention relates to a kind of spectrum-controlling method more particularly to a kind of control methods for optimizing lamp bead spectrum, and are related to
Using the control system of the control method of the optimization lamp bead spectrum.
Background technique
Common RGB and RGBW class LED lamp bead currently on the market, is integrated with R lamp bead, G lamp bead, B lamp in a lamp bead
Pearl and W lamp bead are integrated with a variety of light-emitting LED light emitting components such as red, green, blue, white, the spectrum characteristic of each light emitting component
Different, as shown in Fig. 2, the left side is respectively the spectrogram of blue and green light and feux rouges in Fig. 2, the right is the spectrogram of synthesis.
Generally there is fixed spectrum characteristic in existing volume production LED lamp bead.But it can be to spectrum under certain light scenes
It is proposed that special needs, such as plant growth lighting needs are enhanced in certain spectrum frequency ranges；At present to this kind of special need
It asks, can only be met in a manner of customizing lamp bead or being synthesized by multiple lamp beads, this side by lamp bead production firm
There are some defects for formula: first is that realizing that the period is long；Second is that the cost of customized production or the synthesis of multiple lamp beads is very high；Third is that can only
Fixation meets a kind of the needs of spectrum frequency range, cannot flexibly change.
Applicant before also the Spectral beam combining of LED lamp bead is proposed through variance and the smallest calculation realize it is defeated
Energy difference is minimum between spectrum and target optical spectrum out, but the spectrum that both does not ensure that of this method be it is most like, because
This still cannot meet actual demand in practical applications well.
Summary of the invention
The technical problem to be solved by the present invention is to need to provide one kind to fast implement optimization lamp bead spectrum, and as far as possible
The control method of the similarity degree between reality output spectrum and target optical spectrum is improved, and further provides for using the optimization lamp
The control system of the control method of pearly-lustre spectrum.
In this regard, the present invention provides a kind of control method for optimizing lamp bead spectrum, comprising the following steps:
Step S1 inputs the spectral characteristic of each LED light emitting device in lamp bead；
Step S2 is calculated between lamp bead reality output spectrum and the target optical spectrum according to the output demand of target optical spectrum
Included angle cosine value, corresponding reality output spectrum is spectrum calculated value when taking the included angle cosine value closest to 1；
Step S3 controls the forward current intensity of each LED light emitting device in the lamp bead by the spectrum calculated value.
A further improvement of the present invention is that the step S2 includes following sub-step:
The target frequency bands output valve of target optical spectrum is denoted as T, T is normalized by step S201；
Step S202 calculates and reads the reality output spectrum of all minimum output total value L for reaching target optical spectrum；
Step S203 calculates included angle cosine value of each reality output spectrum respectively between the target optical spectrum；
The included angle cosine value being calculated is compared with the cosine list prestored, retains the angle by step S204
The record of corresponding reality output spectrum when cosine value is closest to 1, and as current spectrum calculated value.
A further improvement of the present invention is that the step S201 includes following sub-step:
The target optical spectrum is divided into 401 computation intervals by step S2011, and the target frequency bands for obtaining target optical spectrum are defeated
Then value T [0....400] out is normalized to the value of [0...1] the frequency range output valve T [0...400] of target optical spectrum
In range；
Step S2012 carries out from 0% the forward current intensity percent [Pr, Pg, Pb, Pw] of each LED light emitting device
Poll to 100% calculates；
Step S2013 calculates the spectrum output intensity of each LED light emitting device according to poll, so that each LED light emitter
The spectrum output intensity of part obtains the value of the spectral intensity O [0...400] of target optical spectrum after being added；
The value of the spectral intensity O [0...400] of target optical spectrum is normalized to the section [0...1] by step S2014.
A further improvement of the present invention is that forward current intensity hundred of the step S2012 to each LED light emitting device
Divide in the poll calculating carried out than [Pr, Pg, Pb, Pw] from 0% to 100%, each LED light emitting device is calculated by matrix
Forward current intensity percent [Pr, Pg, Pb, Pw], the matrix is
A further improvement of the present invention is that further including step S2015 in the step S201, the step S2015 will
The forward current intensity percent [Pr, Pg, Pb, Pw] and its corresponding spectral intensity O [0...400] of each LED light emitting device
Between record value be written into pre-calculated data file, precomputation process is completed by polling loop, is obtained completely estimated
Calculate data file.
A further improvement of the present invention is that circulation is read from the pre-calculated data file in the step S202
The record value, and the corresponding forward current intensity percent [Pr, Pg, Pb, Pw] of the record value is read, it is corresponding to calculate its
Spectrum exports total value, will calculate resulting spectrum output total value and is compared with the minimum output total value L of target optical spectrum, output reaches
To the reality output spectrum of the minimum output total value L of target optical spectrum.
A further improvement of the present invention is that passing through formula in the step S203
Calculate included angle cosine value S of each reality output spectrum respectively between the target optical spectrum, wherein Ti is the mesh of target optical spectrum
Frequency range output valve is marked, i is natural number, and i=0....400, Oi are the spectral intensity of target optical spectrum.
A further improvement of the present invention is that controller is according to spectrum calculated value driving in the step S3
Each LED light emitting device in lamp bead, and then control the forward current intensity of each LED light emitting component in the lamp bead.
A further improvement of the present invention is that the controller driven by constant-current drive circuit it is each in the lamp bead
LED light emitting device.
The present invention also provides a kind of control systems for optimizing lamp bead spectrum, using optimization lamp bead spectrum as described above
Control method, and including controller, constant-current drive circuit and lamp bead, the controller is connected to by the constant-current drive circuit
The driving end of each LED light emitting device of lamp bead.
Compared with prior art, the beneficial effects of the present invention are: according to lamp bead reality output spectrum and the target light
The calculating between included angle cosine value between spectrum, and then it had not only been able to satisfy the output total value of spectrum required for target optical spectrum, but also
The spectrum calculated value of the similarity degree between reality output spectrum and target optical spectrum can be improved, as far as possible to obtain each of the lamp bead
The forward current intensity percent of a LED light emitting device, then by applying corresponding intensity just to each LED light emitting device
Target optical spectrum can be farthest simulated to electric current；Therefore, the present invention can be needed rapidly using the output of existing LED lamp bead
The target optical spectrum wanted, at low cost, the period is short, can expand the purposes of LED lamp bead well, meets the personalized need of user
It asks, and lamp bead effect of optimization of the invention is substantially better than through minimum variance and calculates the effect to realize Spectral beam combining.
Detailed description of the invention
Fig. 1 is the workflow schematic diagram of an embodiment of the present invention；
Fig. 2 is the spectrum characteristic emulation schematic diagram of LED lamp bead in the prior art；
Fig. 3 is the emulation testing figure that an embodiment of the present invention realizes optimization lamp bead spectrum；
Fig. 4 is the system structure diagram of an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, preferably embodiment of the invention is described in further detail.
As shown in Figure 1, this example provides a kind of control method for optimizing lamp bead spectrum, comprising the following steps:
Step S1 inputs the spectral characteristic of each LED light emitting device in lamp bead；
Step S2 is calculated between lamp bead reality output spectrum and the target optical spectrum according to the output demand of target optical spectrum
Included angle cosine value, corresponding reality output spectrum is spectrum calculated value when taking the included angle cosine value closest to 1；
Step S3 controls the forward current intensity of each LED light emitting device in the lamp bead by the spectrum calculated value.
Lamp bead described in this example is the abbreviation of LED lamp bead, the output spectrum intensity of the LED lamp bead and is applied thereon just
It is proportional to current strength.And the synthesis output spectrum intensity of entire LED lamp bead is equal to all included in it shine
The sum of spectrum output of device.It therefore, can be different by applying to multiple LED light emitting device in the lamp beads such as RGB, RGBW class
The forward current of intensity, Lai Shixian simulated target need the purpose of spectrum.Hereinafter, being counted by taking RGBW class lamp bead as an example to Spectral beam combining
Calculation method is illustrated.
In the section that the spectral wavelength of visible light is distributed in from 380 nanometers to 780 nanometer, as unit of 1 nanometer, Ke Yihua
It is divided into 401 computation intervals.The LED light emitting device of red, green, blue and white is respectively represented the with Rn, Gn, Bn and Wn
The maximum spectral intensity in n section, the natural numerical value that n is 0~400, it is strong to represent spectrum of the target optical spectrum in n-th of section with On
Degree respectively represents the forward current intensity percentage of the LED light emitting device of red, green, blue and white with Pr, Pg, Pb and Pw
Than can then pass through matrixCarry out target light
The Strength co-mputation of spectrum.
Therefore, if the LED lamp bead and its spectral characteristic of given RGBW, for peculiar spectrum output demand [O0,
O1 ..., O400], it can attempt to solve the matrix equation, find one suitable [Pr, Pg, Pb, Pw] combination, make
Obtain the target optical spectrum intensity that the calculating output on the right side of the matrix is equal to left side.
But it is limited to the spectral characteristic of specific RGBW lamp bead and the demand of target output spectrum, it is in practical applications, difficult
To find the perfect solution or more perfect solution of the matrix, and it can only attempt to find the approximate optimal solution of the equation.
Before application using for approximate optimal solution, i.e. the scheme of minimum variance sum seeks this near-optimization
Solution, that is, make reality output spectral intensity and target optical spectrum intensity in the smallest solution of the sum of all frequency range upside deviations.But
Variance and minimum, although ensure that the spectrum of output and target optical spectrum energy difference are minimum, it cannot be guaranteed that the spectrum of the two is most
It is similar.And in practical applications, such as to guarantee the color of output spectrum, or meet plant different stages of growth to spectrum
Property requirements, it is desirable that the similitude of spectrum, therefore, the scheme of this minimum variance sum still cannot meet reality well
The demand on border needs further to seek more optimized approximate optimal solution.
This example step S1 inputs the spectral characteristic of each LED light emitting device in lamp bead, passes through R [0..400], G
[0..400], B [0..400] and W [0..400] indicate each LED light emitting device in the output of all spectrum frequency ranges.
Intensity of the step S2 by reality output spectral intensity and target optical spectrum in all frequency ranges described in this example, as two
Vector calculates the angle between the two vectors.If angle is equal to 0 degree, illustrate that the two vectors are on all four, then its light
Spectrum is also on all four.If angle is equal to 90 degree, illustrates that two vectors are orthogonal, be completely unrelated, then its light
Spectrum is also completely unrelated.
Any one group [Pr, Pg, Pb, Pw] is combined, corresponding output spectrum is [T0, T0 ..., T400], with target
The included angle cosine value calculating method of spectrum is
If cosine is equal to 1, illustrates that the angle of the two vectors is 0 degree, be on all four.If two vectors
Cosine is equal to 0, then illustrates that the angle of the two vectors is 90 degree, is complete dissimilar.
So, it is necessary to which finding combines included angle cosine closest to 1 [Pr, Pg, Pb, Pw].The electric current combined with this
RGBW lamp bead is driven to shine, so that it may obtain combination most like with the output waveform of target light spectrum in spectral region, obtain
Best fit approximation solution after to the optimization found required for the application.
More specifically, step S2 described in this example includes following sub-step:
The target frequency bands output valve of target optical spectrum is denoted as T, T is normalized by step S201；
Step S202 calculates and reads the reality output spectrum of all minimum output total value L for reaching target optical spectrum；
Step S203 calculates included angle cosine value of each reality output spectrum respectively between the target optical spectrum；
The included angle cosine value being calculated is compared with the cosine list prestored, retains the angle by step S204
The record of corresponding reality output spectrum when cosine value is closest to 1, and as current spectrum calculated value.
Step S201 described in this example includes following sub-step:
The target optical spectrum is divided into 401 computation intervals by step S2011, and the target frequency bands for obtaining target optical spectrum are defeated
Then value T [0....400] out is normalized to the value of [0...1] the frequency range output valve T [0...400] of target optical spectrum
In range；Due to, it is seen that the spectral wavelength of light is distributed in 380 nanometers to 780 nanometers of section, and therefore, this example is with 1 nanometer
Unit can be divided into 401 computation intervals with target optical spectrum；
Step S2012 carries out from 0% the forward current intensity percent [Pr, Pg, Pb, Pw] of each LED light emitting device
Poll to 100% calculates；
Step S2013 calculates the spectrum output intensity of each LED light emitting device according to poll, so that each LED light emitter
The spectrum output intensity of part obtains the value of the spectral intensity O [0...400] of target optical spectrum after being added；
The value of the spectral intensity O [0...400] of target optical spectrum is normalized to the section [0...1] by step S2014.
Step S2012 described in this example to the forward current intensity percent [Pr, Pg, Pb, Pw] of each LED light emitting device into
The forward current intensity percentage of each LED light emitting device is calculated by matrix in calculating for poll of the row from 0% to 100%
Than [Pr, Pg, Pb, Pw], the matrix is
It preferably, further include step S2015 in step S201 described in this example, the step S2015 is by each LED light emitter
Record value between the forward current intensity percent [Pr, Pg, Pb, Pw] and its corresponding spectral intensity O [0...400] of part is write
Enter into pre-calculated data file, precomputation process completed by polling loop, and then obtain complete pre-calculated data file,
Convenient for subsequent control, avoid and compute repeatedly increase system burden, can effectively reduce each calculating matrix optimal solution or
Time needed for approximate optimal solution, as long as because in practice LED lamp bead once it is determined that, the spectral characteristic of output is really
It is fixed, therefore in the implementation single calculation amount can be reduced by way of pre-calculated data group file.
Corresponding, in step S202 described in this example, circulation reads the record value from the pre-calculated data file, and
The corresponding forward current intensity percent [Pr, Pg, Pb, Pw] of the record value is read, its corresponding spectrum output total value is calculated,
Resulting spectrum output total value will be calculated to be compared with the minimum output total value L of target optical spectrum, output reaches target optical spectrum
The reality output spectrum of minimum output total value L.
In step S203 described in this example, pass through formulaCalculate each reality output light
Compose the included angle cosine value S between the target optical spectrum respectively, wherein Ti is the target frequency bands output valve of target optical spectrum, and i is certainly
So number, i=0....400, Oi are the spectral intensity of target optical spectrum.
In step S3 described in this example, controller 1 drives each LED light emitter in the lamp bead according to the spectrum calculated value
Part, and then control the forward current intensity of each LED light emitting component in the lamp bead.
Controller 1 described in this example preferably drives each LED light emitting device in the lamp bead by constant-current drive circuit 2.
That is, as shown in figure 4, this example also provides a kind of control system for optimizing lamp bead spectrum, using as described above excellent
Change the control method of lamp bead spectrum, and including controller 1, constant-current drive circuit 2 and lamp bead, the controller 1 passes through the perseverance
Stream driving circuit 2 is connected to the driving end of each LED light emitting device of the lamp bead.
User passes through the luminous spectral characteristic of input RGBW lamp bead, and according to the output demand of target optical spectrum, and accordingly
It is calculated, show that optional near-optimization [Pr, Pg, Pb, Pw] is combined.The combination is input to controller 1 and controls its monolithic
Machine, the controller 1 (single-chip microcontroller) control the forward direction electricity of each light emitting component in LED lamp bead by the constant-current drive circuit 2
Road intensity shines to control lamp bead, acquisition and the consistent output of target optical spectrum, experiments verify that, effect is very good, such as schemes
Shown in 3.
To sum up, this example is according to the meter between the included angle cosine value between lamp bead reality output spectrum and the target optical spectrum
It calculates, and then had not only been able to satisfy the output total value of spectrum required for target optical spectrum, but also reality output spectrum and mesh can be improved as far as possible
The spectrum calculated value of the similarity degree between spectrum is marked, it is strong to obtain the forward current of each LED light emitting device of the lamp bead
Percentage is spent, it then can utmostly simulation by applying the forward current of corresponding intensity to each LED light emitting device
Target optical spectrum out；Therefore, the target optical spectrum that the present invention can rapidly be needed using the output of existing LED lamp bead, at low cost, period
It is short, the purposes of LED lamp bead can have been expanded well, meet the individual demand of user, and lamp bead effect of optimization of the invention
It is substantially better than through minimum variance and calculates the effect to realize Spectral beam combining.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of control method for optimizing lamp bead spectrum, which comprises the following steps:
Step S1 inputs the spectral characteristic of each LED light emitting device in lamp bead；
Step S2 calculates the folder between lamp bead reality output spectrum and the target optical spectrum according to the output demand of target optical spectrum
Angle cosine value, corresponding reality output spectrum is spectrum calculated value when taking the included angle cosine value closest to 1；
Step S3 controls the forward current intensity of each LED light emitting device in the lamp bead by the spectrum calculated value.
2. the control method of optimization lamp bead spectrum according to claim 1, which is characterized in that the step S2 includes following
Sub-step:
The target frequency bands output valve of target optical spectrum is denoted as T, T is normalized by step S201；
Step S202 calculates and reads the reality output spectrum of all minimum output total value L for reaching target optical spectrum；
Step S203 calculates included angle cosine value of each reality output spectrum respectively between the target optical spectrum；
The included angle cosine value being calculated is compared with the cosine list prestored, retains the included angle cosine by step S204
The record of corresponding reality output spectrum when being worth closest to 1, and as current spectrum calculated value.
3. it is according to claim 2 optimization lamp bead spectrum control method, which is characterized in that the step S201 include with
Lower sub-step:
The target optical spectrum is divided into 401 computation intervals by step S2011, obtains the target frequency bands output valve T of target optical spectrum
[0....400] is then normalized to the value range of [0...1] the frequency range output valve T [0...400] of target optical spectrum
It is interior；
Step S2012, to the forward current intensity percent [Pr, Pg, Pb, Pw] of each LED light emitting device carry out from 0% to
100% poll calculates；
Step S2013 calculates the spectrum output intensity of each LED light emitting device according to poll, so that each LED light emitting device
Spectrum output intensity obtains the value of the spectral intensity O [0...400] of target optical spectrum after being added；
The value of the spectral intensity O [0...400] of target optical spectrum is normalized to the section [0...1] by step S2014.
4. the control method of optimization lamp bead spectrum according to claim 3, which is characterized in that the step S2012 is to each
The forward current intensity percent [Pr, Pg, Pb, Pw] of a LED light emitting device lead in the poll calculating from 0% to 100%
The forward current intensity percent [Pr, Pg, Pb, Pw] that each LED light emitting device is calculated in matrix is crossed, the matrix is
5. the control method of optimization lamp bead spectrum according to claim 3, which is characterized in that also wrapped in the step S201
Include step S2015, the step S2015 by the forward current intensity percent [Pr, Pg, Pb, Pw] of each LED light emitting device and
Record value between its corresponding spectral intensity O [0...400] is written into pre-calculated data file, is completed by polling loop
Precomputation process obtains complete pre-calculated data file.
6. the control method of optimization lamp bead spectrum according to claim 5, which is characterized in that in the step S202, follow
Ring reads the record value from the pre-calculated data file, and reads the corresponding forward current intensity percentage of the record value
Than [Pr, Pg, Pb, Pw], its corresponding spectrum output total value is calculated, resulting spectrum output total value and target optical spectrum will be calculated
Minimum output total value L is compared, and output reaches the reality output spectrum of the minimum output total value L of target optical spectrum.
7. according to the control method of optimization lamp bead spectrum described in claim 2 to 6 any one, which is characterized in that the step
In rapid S203, pass through formulaCalculate each reality output spectrum respectively with the target optical spectrum
Between included angle cosine value S, wherein Ti be target optical spectrum target frequency bands output valve, i is natural number, i=0....400, Oi
For the spectral intensity of target optical spectrum.
8. according to claim 1 to the control method of optimization lamp bead spectrum described in 6 any one, which is characterized in that the step
In rapid S3, controller drives each LED light emitting device in the lamp bead according to the spectrum calculated value, and then controls the lamp bead
In each LED light emitting component forward current intensity.
9. the control method of optimization lamp bead spectrum according to claim 8, which is characterized in that the controller passes through constant current
Driving circuit drives each LED light emitting device in the lamp bead.
10. a kind of control system for optimizing lamp bead spectrum, which is characterized in that use as described in claim 1 to 9 any one
Optimization lamp bead spectrum control method, and including controller, constant-current drive circuit and lamp bead, the controller passes through the perseverance
Stream driving circuit is connected to the driving end of each LED light emitting device of the lamp bead.
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Address after: 5 / F, No.1 Factory building, Hongtu Industrial Park, Hezhou community, Hangcheng street, Bao'an District, Shenzhen City, Guangdong Province Applicant after: SHENZHEN LITETRACE TECHNOLOGIES Co.,Ltd. Address before: 518055 Tsinghua information harbor complex, north of Nanshan District Science Park, Shenzhen, Guangdong province 704/705 Applicant before: SHENZHEN LITETRACE TECHNOLOGIES Co.,Ltd. |
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Application publication date: 20190312 |