CN111065183B - Method and system for controlling illumination intensity of LED table lamp - Google Patents
Method and system for controlling illumination intensity of LED table lamp Download PDFInfo
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Abstract
The invention relates to the field of movable illumination, and particularly discloses a method and a system for controlling illumination intensity of an LED table lamp, wherein the method comprises the steps of emitting a standard white light beam to the surface of paper, and the standard white light beam is perpendicular to the surface of the paper; according to the CIE coordinates (X) n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) And an offset (X) c ，Y c ) Corresponding spectrum F C Intensity of reflected lightRelative to standard white light beam intensityVariation of (2)According to (X c ，Y c )、F C 、And controlling the driving currents of a warm light LED, a cold light LED, a red light LED, a blue light LED and a green light LED in the LED table lamp. The invention is implemented by obtaining reflected light (X c ，Y c )、According to (X c ，Y c )、F C 、The luminous intensity of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED is controlled, so that the spectrum corresponding to the reflected light on the paper is close to the saturation of the sunlight spectrum, and the eye strain caused by glare caused by excessive reflection or diffuse reflection is prevented.
Description
Technical Field
The invention relates to the field of movable illumination, in particular to a method and a system for controlling illumination intensity of an LED table lamp.
Background
Along with the progress of society, the LED illumination desk lamp is deeply favored by wide reading lovers and student groups due to the characteristics of energy conservation, mobility, adjustable swing arms and the like, and becomes a preferred product of the desktop reading auxiliary light source. At present, the books in the market are more and more diversified, and even if the books are paper, the materials and the colors are different. The light absorption and reflection of the paper with different materials and colors are different, so that the illumination intensity of each light system required when the reflected light on the reading material is close to the saturation of the sunlight spectrum is different, but the color system and the light intensity of the LED desk lamp on the market are fixed when the LED desk lamp is illuminated, and when the fixed light of the LED lamp is not matched with a certain paper reading material, the excessive fatigue of eyes is caused by the glare caused by the excessive reflection or diffuse reflection of the paper, so that the eyesight, especially the eyesight of teenagers and children, is seriously influenced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for controlling the illumination intensity of an LED table lamp, which can intelligently adjust the color system luminous intensity matched with the paper reading material according to the material and the color of the paper reading material, so that the reflected light on the paper reading material is close to the saturation of sunlight spectrum, thereby relieving the visual fatigue caused by excessive reflection or diffuse reflection during reading and protecting eyes.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
transmitting a standard white light beam to a paper surface, wherein the standard white light beam is perpendicular to the paper surface;
obtaining reflected light of the standard white light beam on the surface of the paper;
according to the CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) Said (X) c ，Y c ) Corresponding spectrum F C The light intensity of the reflected lightLight intensity relative to the standard white light beam>Variation of>
According to said (X) c ，Y c )、F C 、And controlling the driving currents of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED in the LED table lamp so that the spectrum of the reflected light of the paper is close to the saturation of the sunlight spectrum after the light beams emitted by the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED are irradiated on the paper.
Preferably, the standard white light beam comprises a plurality of beams, and each standard white light beam corresponds to one reflected light;
said CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) And the reflected light intensityRelative to the standard white light beam intensity->Variation of>The method comprises the following steps:
each reflected light is obtained in standard CIE coordinates (X 0 ,Y 0 ) Offset (X) n-0 ,Y n-0 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is 1-0 ＝X 1 -X 0 ，X 2-0 ＝X 2 -X 0 ，…，X n-0 ＝X n -X 0 ；Y 1-0 ＝Y 1 -Y 0 ，Y 2-0 ＝Y 2 -Y 0 ，…，Y n-0 ＝Y n -Y 0 ；
All of the (X N-0 ,Y N-0 ) Mean value of (X), i.e. X c ＝AVERAGE(X 1-0 :X n-0 ),Y c ＝AVERAGE(Y 1-0 :Y n-0 ) To obtain said (X) c ，Y c )；
Said (X) c ，Y c ) Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The intensity of (a) is that
Preferably, the acquiring the offset (X c ，Y c ) Corresponding spectrum F C The method comprises the following steps:
obtaining each of the (X n-0 ,Y n-0 ) Corresponding spectrum F n-0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein F is 1-0 ＝F 1 -F 0 ，F 2-0 ＝F 2 -F 0 ，…，F n-0 ＝F n -F 0 ；
Calculate all of the F n-0 Mean value of (F) C ＝AVERAGE(F 1-0 ,F n-0 )；
The F is C Light of the corresponding wavelength is used to compensate for the spectrum absorbed by the paper.
Preferably, the said method is based on (X c ，Y c )、F C 、The step of controlling the driving current of a warm light LED, a cold light LED, a red light LED, a blue light LED and a green light LED in the LED table lamp comprises the following steps:
according to the intensityInformation and said (X) c ，Y c ) The information output corresponds to pre-stored first current intensity information, the first current intensity information is used for indicating a current value for driving the warm light LED to emit light and a current value for driving the cold light LED to emit light, and the current value enables the light emitted by the warm light LED and the cold light LED to compensate the intensity after being mixed>
Preferably, the method further comprises: according to the spectrum F C Outputting corresponding second current intensity information by the information; the second current intensity information is used for indicating a current value for driving the red light LED to emit light, a current value for driving the blue light LED to emit light and a current value for driving the green light LED to emit light, and the current value enables the spectrum of light generated by mixing the light emitted by the red light LED, the blue light LED and the green light LED to be F C 。
In another aspect, the invention also discloses a system for controlling the illumination intensity of an LED desk lamp, comprising:
the LEDs comprise a warm light LED, a cold light LED, a red light LED, a blue light LED and a green light LED;
the emission probe is used for emitting a standard white light beam to the surface of the paper, and the standard white light beam is perpendicular to the surface of the paper;
a receiving probe for receiving the reflected light of the standard white light beam on the surface of the paper;
a signal processor connected with the transmitting probe and the receiving probe for obtaining the CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) And the (X) c ，Y c ) Corresponding spectrum F C Light intensity of the reflected lightLight intensity relative to the standard white light beam>Variation of>
A dimming driver connected with the signal processor and the LED for controlling the dimming according to the (X c ，Y c )、F C 、And controlling the driving currents of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED in the LED table lamp so that the spectrum of the reflected light of the paper is close to the saturation of the sunlight spectrum after the light beams emitted by the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED are irradiated on the paper.
Preferably, the signal conversion module is used for acquiring each reflected light in standard CIE coordinates (X 0 ,Y 0 ) Offset (X) n-0 ,Y n-0 ) Each of said (X n-0 ,Y n-0 ) Corresponding spectrum F n-0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is 1-0 ＝X 1 -X 0 ，X 2-0 ＝X 2 -X 0 ，…，X n-0 ＝X n -X 0 ；Y 1-0 ＝Y 1 -Y 0 ，Y 2-0 ＝Y 2 -Y 0 ，…，Y n-0 ＝Y n -Y 0 ；F 1-0 ＝F 1 -F 0 ，F 2-0 ＝F 2 -F 0 ，…，F n-0 ＝F n -F 0 ；
All of the (X N-0 ,Y N-0 ) Mean value of (X), i.e. X c ＝AVERAGE(X 1-0 :X n-0 ),Y c ＝AVERAGE(Y 1-0 :Y n-0 ) To obtain said (X) c ，Y c ) The method comprises the steps of carrying out a first treatment on the surface of the Said (X) c ，Y c Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The intensity of (a) is that
Calculate all of the F n-0 Mean value of (F) C ＝AVERAGE(F 1-0 ,F n-0 )；
The F is C Light of the corresponding wavelength is used to compensate for the spectrum absorbed by the paper.
Preferably, the signal processor further includes: and the signal filtering module is connected between the receiving probe and the signal conversion module and is used for filtering noise in the reflected light.
Preferably, the dimming driver includes:
the signal receiving module is connected with the signal conversion module and is used for receiving the signal according to the intensityInformation and said (X) c ，Y c ) Information outputting corresponding pre-stored first current intensity information, and according to the spectrum F C Outputting corresponding second current intensity information by the information; the first current intensity information is used for indicating a current value for driving the warm light LED to emit light and a current value for driving the cold light LED to emit light, and the current value enables the light emitted by the warm light LED and the light emitted by the cold light LED to compensate the intensity after being mixed>The second current intensity information is used for indicating a current value for driving the red LED to emit light, a current value for driving the blue LED to emit light and a current value for driving the green LED to emit light, wherein the current values enable the red LED to emit lightThe spectrum of the light generated by mixing the light emitted by the LED, the blue light LED and the green light LED is F C 。
And the dimming driving module is connected with the signal receiving module and is used for receiving the first current intensity information to control the current intensity output to the warm light LED and the cold light LED and receiving the second current intensity information to control the current intensity output to the red light LED, the blue light LED and the green light LED.
Preferably, the dimming driver further includes:
and the power amplification module is connected between the dimming driving module and the LED and is used for amplifying the current output by the dimming driving module.
Compared with the prior art, the invention has the beneficial effects that:
by comparing the reflected light with the original standard white light beam, the CIE coordinates (X n ，Y n ) Average offset (X) c ，Y c ) By CIE coordinates (X c ，Y c ) Obtaining the light intensity variation of the reflected lightAt least a warm light LED, a cold light LED, a red light LED, a blue light LED and a green light LED are arranged on the LED desk lamp according to (X) c ，Y c )、(X c ，Y c ) Corresponding spectrum F C Amount of change->The luminous intensity of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED is controlled, so that the luminous energy emitted by the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED compensates the color light absorbed by paper and compensates the intensity or attenuation degree of the reflected light, the spectrum corresponding to the reflected light on the paper is close to the saturation of the sunlight spectrum, the excessive fatigue of eyes caused by glare caused by excessive reflection or diffuse reflection is prevented, and the eyes are protected.
Drawings
The invention will now be further described with reference to the accompanying drawings and specific examples:
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a system block diagram of the present invention;
FIG. 3 is a schematic view of a PCBA module in accordance with the present invention;
FIG. 4 is a schematic structural view of an inductive probe of the present invention;
fig. 5 is a schematic structural view of the LED desk lamp of the invention.
In the figure:
1. the signal processor(s) is (are) configured to,
11. signal generation module 12, signal filtering module 13, signal conversion module 14, signal processor power supply module
2. The light-adjusting driver is provided with a light-adjusting control circuit,
21. a power amplifying module 22, a dimming driving module 23, a signal receiving module 24, a dimming driver power supply module 3, a PCB base,
31. the detection probe comprises a detection probe body, 32, a warm light LED,33, a cold light LED,34, a red light LED,35, a green light LED,36, a blue light LED,311, a transmitting probe body, 312, a receiving probe body, 313 and a hemispherical lens;
4. paper, 5, bracing piece, 6, supporting seat, 7, lamp shade.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1
As shown in fig. 1, the present embodiment discloses a method for controlling the illumination intensity of an LED desk lamp, which comprises the following steps:
s1: emitting a standard white light beam to the surface of the paper 4, wherein the standard white light beam is perpendicular to the surface of the paper 4;
s2: obtaining reflected light of a standard white light beam on the surface of the paper 4;
s3: according to the CIE coordinates (X) n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset in (a)(X c ，Y c ) Offset (X) c ，Y c ) Corresponding spectrum F C Intensity of reflected lightLight intensity relative to a standard white light beam>Variation of>
S4: according to (X c ，Y c )、F C 、The driving currents of the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 in the LED table lamp are controlled, so that after the light beams emitted by the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 are irradiated on the paper 4, the spectrum of the reflected light of the paper 4 is close to the saturation of the sunlight spectrum.
By comparing the reflected light with the original standard white light beam, the CIE coordinates (X n ，Y n ) Average offset (X) c ，Y c ) By CIE coordinates (X c ，Y c ) Obtaining the light intensity variation of the reflected lightAt least a warm light LED32, a cool light LED33, a red light LED34, a blue light LED36, a green light LED35 are provided on the LED desk lamp according to (X c ，Y c )、(X c ，Y c ) Corresponding spectrum F C Amount of change->The luminous intensity of the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 is controlled so that the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 emit lightThe emitted light energy compensates the color light absorbed by the paper 4 and compensates the intensity or attenuation degree of the reflected light, so that the spectrum corresponding to the reflected light on the paper 4 is close to the saturation of the sunlight spectrum, the eye strain caused by glare caused by excessive reflection or diffuse reflection is prevented, and the eyes are protected.
In this embodiment, the standard white light beam includes a plurality of beams, each of which corresponds to one reflected light; the step S2 comprises the following steps:
obtaining each reflected light in standard CIE coordinates (X 0 ,Y 0 ) Offset (X) n-0 ,Y n-0 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is 1-0 ＝X 1 -X 0 ，Y 1-0 ＝Y 1 -Y 0 ；X 2-0 ＝X 2 -X 0 ，Y 2-0 ＝Y 2 -Y 0 ；…；X n-0 ＝X n -X 0 ，Y n-0 ＝Y n -Y 0 ；
Calculate all (X) N-0 ,Y N-0 ) Mean value of (X), i.e. X c ＝AVERAGE(X 1-0 :X n-0 ),Y c ＝AVERAGE(Y 1-0 :Y n-0 ) To obtain (X) c ，Y c )；
(X c ，Y c ) Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The intensity of (i.e.)
And:
obtain each (X) n-0 ,Y n-0 ) Corresponding spectrum F n-0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein F is 1-0 ＝F 1 -F 0 ，F 2-0 ＝F 2 -F 0 ，…，F n-0 ＝F n -F 0 ；
Calculate all F n-0 Mean value of (F) C ＝AVERAGE(F 1-0 ,F n-0 )；
F C The light of the corresponding wavelength is used to compensate for the spectrum absorbed by the paper 4.
Or:
obtain coordinates as(X n ，Y n ) Illumination intensity of reflected light of (2)Coordinate with (X) 0 ,Y 0 ) Is the illumination intensity of the standard light beam +.>Difference of->(i.e.)>) Calculate->) The method comprises the steps of carrying out a first treatment on the surface of the The average value of the illumination intensity difference between all reflected light and the standard light beam is obtained.
If the paper 4 is light yellow, the light yellow paper 4 absorbs part of the yellow light in the light yellow paper 4 when the light yellow paper 4 is irradiated with the standard white light, and the CIE coordinates of the reflected light after the absorption of part of the yellow light are (X n ,Y n ) Which is relative to the CIE coordinates (X 0 ,Y 0 ) The offset of (2) is (X) n -X 0 ,Y n -Y 0 ) The method comprises the steps of carrying out a first treatment on the surface of the Offset (X) n -X 0 ,Y n -Y 0 ) Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The chromaticity of the light is absorbed, and at the same time, the illumination intensity of the reflected light is obtainedIllumination intensity with standard light beam->The difference of +.>(i.e.)>) Offset (X) n -X 0 ,Y n -Y 0 ) The corresponding spectrum is F N . According to the offset (X) n -X 0 ,Y n -Y 0 ) Intensity difference->The driving current of the warm light LED32 and the cold light LED33 is controlled according to the spectrum F N Controlling the driving current of the red LED34, the blue LED36 and the green LED35; the magnitude of the current is controlled to control the light emission intensity of the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35, so that the emitted red light, blue light and green light are mixed to generate colored light absorbed by the paper 4, and the emitted warm light and cold light are mixed to generate counteraction>Further, the light which is mixed and generated by the warm light, cold light, red light, blue light and green light which are irradiated on the paper 4 supplements the absorbed color light, so that the spectrum of the reflected light on the paper 4 is close to the saturation of the sunlight spectrum, and further, eyes are always in the light environment close to the sunlight, eye fatigue is relieved, and eyes are further protected.
In order to improve accuracy and reliability, the present embodiment obtains (X by obtaining a plurality of reflected lights c ，Y c )、F C 、
Regarding the difference between the illumination intensity of the reflected light and the illumination intensity of the standard white light, it is assumed that the coordinate is (X n ，Y n ) The illumination intensity of the reflected light of (2) isThe illumination intensity of the standard white light beam is +.>The illumination intensity compared with the standard beam>The increase of the illumination intensity of the reflected light is +.>Is a physical vector, such as +.A when the surface of the paper 4 is covered with a strongly reflective material such as plastic film>Will be a positive value, when the surface of the paper 4 is not covered, then +.>Either positive or negative. Thus, when->When the value is negative, the reflection intensity of the paper 4 is too small, and the luminous intensity of the warm light LED32 and the cold light LED33 is increased to strengthen the luminosity on the paper 4, namely the reflection of the paper 4 is enhanced, and the enhanced reflection counteracts +.>Ensuring that the spectrum of the reflected light is close to the saturation of the sunlight spectrum; when->When the value is positive, the reflected light intensity of the paper 4 is too large, and the luminous intensity of the warm light LED32 and the cold light LED33 is reduced, so that the luminosity on the paper 4 is weakened, namely the reflected light of the paper 4 is weakened, and the weakened reflected light is added with +.>The spectrum of the reflected light after that is close to the solar spectrum saturation.
In this embodiment, step S4 includes:
according to the intensityInformation and said (X) c ，Y c ) The information output corresponds to pre-stored first current intensity information, the first current intensity information is used for indicating a current value for driving the warm light LED to emit light and a current value for driving the cold light LED to emit light, and the current value enables the light emitted by the warm light LED and the cold light LED to compensate the intensity after being mixed>
According to the spectrum F C Outputting corresponding second current intensity information by the information; the second current intensity information is used for indicating a current value for driving the red light LED to emit light, a current value for driving the blue light LED to emit light and a current value for driving the green light LED to emit light, and the current value enables the spectrum of light generated by mixing the light emitted by the red light LED, the blue light LED and the green light LED to be F C 。
Specifically, a control system is arranged in the LED table lamp, a memory bank is arranged in the control system, and a control signal instruction set is stored in the memory bank; the control signal instruction includes an offset coordinate value (X N ,Y N ) Information, spectrum F C1 Information, intensityInformation, coordinate value (X) N ,Y N ) Information and intensity->First current intensity information and spectrum F corresponding to the information C1 Second current intensity information corresponding to the information;
alignment (X) c ,Y c ) And (X) N ,Y N ) When (X c ,Y c ) And (X) N ,Y N ) When the difference of (2) is smaller than the first preset value, obtain (X N ,Y N ) Corresponding first current intensity information to control the intensity of current output to the warm light LED32, the cool light LED 33;
alignment F C And F C1 When F C And F C1 When the difference value of (2) is smaller than a second preset value, F is obtained C1 The corresponding second current intensity information controls the intensity of the current output to the red LED34, the blue LED36, and the green LED 35.
If the control instruction carries the offset (X c ，Y c ) Information, spectrum F C Information, intensityInformation, e.g. control instruction, carrying the offset (X in step S2 c ，Y c ) Information, spectrum F C Information, intensity->The information about the information,
for example, when the offset coordinate value (X N3 ,Y N3 ) Information and (X) 3 ，Y 3 ) Is the difference of (2)<At 0.0001, the system default offset coordinate value (X N3 ,Y N3 ) Corresponding control signal command and (X) 3 ，Y 3 ) A perfect match; extracting a shift coordinate value (X) N3 ,Y N3 ) Corresponding control signals instruct to control the drive currents of warm light LED32 and cool light LED 33.
Or:
when the offset coordinate value (X N ,Y N ) Control signal of (2) instructs the package and the coordinate value (X) in the bank N1 ,Y N1 ) Differences between control instruction packets<At 0.0001, the system default offset coordinate value (X N ,Y N ) Control signal of (2) instructs the package and the coordinate value (X) in the bank N1 ,Y N1 ) Is a perfect match;
when spectrum F is retrieved C Information control signal instructs package and repository spectrum F C1 When the binary code between control instruction packets is within 4 bytes, the system defaults to F C Information control signal instructs package and repository spectrum F C1 The control instruction packets being perfectly matched
When the illumination intensity is retrievedControl signal instruction packet of information and illuminance in memory bank>When the difference between the control instruction packets is less than 0.001, the default illumination intensity of the system is +.>Control signal instruction packet of information and illuminance in memory bank>The control instruction packets are perfectly matched;
therefore, the control signal instruction includes the coordinate value (X N1 ,Y N1 ) Control instruction packet and spectrum F of (2) C1 Control instruction packet and illuminanceA control instruction packet for controlling CIE coordinates (X N ,Y N ) Illuminance +.>Corresponding current intensity signals of the warm light LED32 and the cold light LED33 and output spectrum F C The corresponding current intensity signals of the red LED34, the blue LED36 and the green LED35;
example two
As shown in fig. 2, the present embodiment discloses a system for controlling illumination intensity of an LED table lamp, including:
the LEDs comprise a warm light LED32, a cold light LED33, a red light LED34, a blue light LED36 and a green light LED35;
a transmitting probe 311 for transmitting a standard white light beam to the surface of the paper 4, the standard white light beam being perpendicular to the surface of the paper 4;
a receiving probe 312 for receiving the reflected light of the standard white light beam on the surface of the sheet 4;
signal processor 1Is connected to the transmitting probe 311 and the receiving probe 312 for measuring the CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) And (X) c ，Y c ) Corresponding spectrum F C Intensity of reflected lightLight intensity relative to a standard white light beam>Variation of>
A dimming driver 2 connected to the signal processor, the LED for driving the light source according to (X c ，Y c )、F C 、The driving currents of the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 in the LED table lamp are controlled, so that after the light beams emitted by the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 are irradiated on the paper 4, the spectrum of the reflected light of the paper 4 is close to the saturation of the sunlight spectrum.
In the present embodiment, the signal processor 1 includes a signal conversion module 13, and the signal conversion module 13 is configured to:
obtaining each reflected light in standard CIE coordinates (X 0 ,Y 0 ) Offset (X) n-0 ,Y n-0 ) Each (X) n-0 ,Y n-0 ) Corresponding spectrum F n-0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is 1-0 ＝X 1 -X 0 ，X 2-0 ＝X 2 -X 0 ，…，X n-0 ＝X n -X 0 ；Y 1-0 ＝Y 1 -Y 0 ，Y 2-0 ＝Y 2 -Y 0 ，…，Y n-0 ＝Y n -Y 0 ；F 1-0 ＝F 1 -F 0 ，F 2-0 ＝F 2 -F 0 ，…，F n-0 ＝F n -F 0 ；
Calculate all (X) N-0 ,Y N-0 ) Mean value of (X), i.e. X c ＝AVERAGE(X 1-0 :X n-0 ),Y c ＝AVERAGE(Y 1-0 :Y n-0 ) To obtain (X) c ，Y c )；(X c ，Y c Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The intensity of (i.e.)
Calculate all F n-0 Mean value of (F) C ＝AVERAGE(F 1-0 ,F n-0 )；
F C The light of the corresponding wavelength is used to compensate for the spectrum absorbed by the paper 4.
In the present embodiment, the signal processor 1 further includes:
the signal filtering module 12 is connected between the receiving probe 312 and the signal converting module 13, and is used for filtering noise in the reflected light.
In this embodiment, the dimming driver 2:
a signal receiving module 23 connected with the signal conversion module 13 for receiving the intensityInformation and said (X) c ，Y c ) Information outputting corresponding pre-stored first current intensity information, and according to the spectrum F C Outputting corresponding second current intensity information by the information; the first current intensity information is used for indicating a current value for driving the warm light LED to emit light and a current value for driving the cold light LED to emit light, and the current value enables the light emitted by the warm light LED and the light emitted by the cold light LED to compensate the intensity after being mixed>The second current intensity information is used for indicating a current value for driving the red LED to emit light, a current value for driving the blue LED to emit light and a current value for driving the green LED to emit lightThe current value is such that the spectrum of the light generated by mixing the light emitted by the red LED, the blue LED and the green LED is F C 。
The dimming driving module 22 is connected to the signal receiving module 23, and is configured to receive the first current intensity information to control the current intensity output to the warm light LED32 and the cold light LED33, and to receive the second current intensity information to control the current intensity output to the red light LED34, the blue light LED36 and the green light LED 35.
Specifically, the control instruction includes (X c ，Y c ) Information, F C Information (information),Information;
the signal receiving module 23 stores a control signal instruction set;
the control signal instruction includes an offset coordinate value (X N ,Y N ) Information, spectrum F C1 Information, intensityInformation (X) N ,Y N )、/>Corresponding first current intensity information, F C1 Corresponding second current intensity information;
the signal receiving module 23 is connected to the signal converting module 13 for comparing (X c ,Y c ) And (X) N ,Y N ) When (X c ,Y c ) And (X) N ,Y N ) When the difference of (2) is smaller than the first preset value, (X N ,Y N ) The corresponding control signal instruction is sent to the dimming driving module 22, so that the dimming driving module 22 controls the current intensity output to the warm light LED32 and the cold light LED 33; alignment F C And F C1 When F C And F C1 When the difference value of F is smaller than the second preset value C1 The corresponding control signal command is sent to the dimming driving module 22 to enable the dimming driving module 22 to control the current output to the red LED34, the blue LED36 and the green LED35Strength.
In the present embodiment, the dimming driver 2 further includes:
the power amplification module 21 is connected between the dimming driving module 22 and the LED, and is used for amplifying the current output by the dimming driving module 22.
In this embodiment, further comprising: a signal generation module 11, a signal processor power supply module 14, and a dimming driver power supply module 24; the signal processor power supply module 14 is arranged in the signal processor 1 and is connected with the mains supply in parallel through a C11 wire harness, so that the signal processor 1 is kept in a working state; the power supply module of the dimming driver 2 is arranged in the dimming driver 2 and is connected with the mains supply in parallel through a C10 wire harness, so that the dimming driver 2 is kept in a working state.
The signal generating module 11 and the transmitting probe 311 are used for controlling the number of times the transmitting probe 311 transmits the standard white light beam. The standard white light beams are emitted for multiple times to obtain multiple reflected lights, and the mean value of CIE coordinate offset of each reflected light is calculated to improve the accuracy and the effectiveness of data.
Example III
The embodiment discloses an LED table lamp which comprises a system of the second embodiment,
in the embodiment, the detection probe 31 is included, the detection probe 31 comprises a transmitting probe 311, a receiving probe 312, a fixed seat and a hemispherical lens 313, the transmitting probe 311, the receiving probe 312 and the hemispherical lens 313 are arranged on the fixed seat, and the transmitting probe 311 and the receiving probe 312 are positioned in the hemispherical lens 313
In this embodiment, the LED and detection probe 31 is mounted on the PCB base 3; the red light LEDs 34, the blue light LEDs 36 and the green light LEDs 35 are arranged in the middle of the PCB base 3, the warm light LEDs 32 and the cold light LEDs 33 are arranged at two ends of the PCB base 3, and the warm light LEDs 32 and the cold light LEDs 33 are arranged at intervals; the inspection probe 31 is mounted at an end of the PCB base 3.
The LED desk lamp in the embodiment comprises a supporting seat 6, a bendable supporting rod 5 and a lampshade 7; one end of the supporting rod 5 is fixed on the supporting seat 6, and the other end is connected with the lampshade 7; the PCB base 3 is mounted on the inner top of the lamp housing 7.
In this embodiment, the red LED34, the blue LED36, and the green LED35 are disposed in the middle of the PCB base 3, so that the uniformity of the red light, the blue light, and the green light striking on each position of the paper 4 is the same, and further the red light, the blue light, and the green light on each position of the paper 4 are mixed according to the same proportion to generate the light absorbed by the paper 4, so as to implement the light compensation of the paper 4; the warm light LEDs 32 and the cold light LEDs 33 are arranged at intervals, so that the intensity of the mixed light of the warm light and the cold light striking on each position of the paper 4 is the same, namely, the same light intensity on each position of the paper 4 is ensured, the visual comfort is ensured, and the eye fatigue is reduced.
The present invention is not limited to the above-described embodiments, but it is intended that the present invention also includes modifications and variations if they fall within the scope of the claims and the equivalents thereof, if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A method for controlling the intensity of illumination of an LED table lamp, comprising the steps of:
transmitting a standard white light beam to a paper surface, wherein the standard white light beam is perpendicular to the paper surface;
obtaining reflected light of the standard white light beam on the surface of the paper;
according to the CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) Said (X) c ，Y c ) Corresponding spectrum F C The light intensity of the reflected lightLight intensity relative to the standard white light beam>Variation of>
According to said (X) c ，Y c )、F C 、And controlling the driving currents of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED in the LED table lamp so that the spectrum of the reflected light of the paper is close to the saturation of the sunlight spectrum after the light beams emitted by the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED are irradiated on the paper.
2. The method for controlling illumination intensity of an LED desk lamp of claim 1, wherein the standard white light beam comprises a plurality of beams, each of the standard white light beams corresponding to one reflected light;
said CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) And the reflected light intensityRelative to the standard white light beam intensity->Variation of>The method comprises the following steps:
each reflected light is obtained in standard CIE coordinates (X 0 ,Y 0 ) Offset (X) n-0 ,Y n-0 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is 1-0 ＝X 1 -X 0 ，X 2-0 ＝X 2 -X 0 ，…，X n-0 ＝X n -X 0 ；Y 1-0 ＝Y 1 -Y 0 ，Y 2-0 ＝Y 2 -Y 0 ，…，Y n-0 ＝Y n -Y 0 ；
All of the (X N-0 ,Y N-0 ) Mean value of (X), i.e. X c ＝AVERAGE(X 1-0 :X n-0 ),Y c ＝AVERAGE(Y 1-0 :Y n-0 ) To obtain said (X) c ，Y c )；
Said (X) c ，Y c ) Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The intensity of (a) is that
3. Method for controlling the illumination intensity of a LED desk lamp according to claim 2, characterized in that the acquisition of the offset (X c ，Y c ) Corresponding spectrum F C The method comprises the following steps:
obtaining each of the (X n-0 ,Y n-0 ) Corresponding spectrum F n-0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein F is 1-0 ＝F 1 -F 0 ，F 2-0 ＝F 2 -F 0 ，…，F n-0 ＝F n -F 0 ；
Calculate all of the F n-0 Mean value of (F) C ＝AVERAGE(F 1-0 ,F n-0 )；
The F is C Light of the corresponding wavelength is used to compensate for the spectrum absorbed by the paper.
4. A method for controlling the illumination intensity of a LED desk lamp as claimed in claim 3, characterized in that the said control is performed in accordance with (X c ，Y c )、F C 、The step of controlling the driving current of a warm light LED, a cold light LED, a red light LED, a blue light LED and a green light LED in the LED table lamp comprises the following steps:
according to the intensityInformation and said (X) c ，Y c ) The information output corresponds to pre-stored first current intensity information, the first current intensity information is used for indicating a current value for driving the warm light LED to emit light and a current value for driving the cold light LED to emit light, and the current value enables the light emitted by the warm light LED and the cold light LED to compensate the intensity after being mixed>
5. The method for controlling the illumination intensity of an LED desk lamp of claim 4, further comprising:
according to the spectrum F C Outputting corresponding second current intensity information by the information; the second current intensity information is used for indicating a current value for driving the red light LED to emit light, a current value for driving the blue light LED to emit light and a current value for driving the green light LED to emit light, and the current value enables the spectrum of light generated by mixing the light emitted by the red light LED, the blue light LED and the green light LED to be F C 。
6. A system for controlling the intensity of illumination of an LED table lamp, comprising:
the LEDs comprise a warm light LED, a cold light LED, a red light LED, a blue light LED and a green light LED;
the emission probe is used for emitting a standard white light beam to the surface of the paper, and the standard white light beam is perpendicular to the surface of the paper;
a receiving probe for receiving the reflected light of the standard white light beam on the surface of the paper;
a signal processor connected with the transmitting probe and the receiving probe for obtaining the CIE coordinates (X n ，Y n ) The reflected light is obtained at standard CIE coordinates (X 0 ,Y 0 ) Offset (X) c ，Y c ) And the (X) c ，Y c ) Corresponding spectrum F C Light intensity of the reflected lightLight intensity relative to the standard white light beam>Variation of>
A dimming driver connected with the signal processor and the LED for controlling the dimming according to the (X c ，Y c )、F C 、And controlling the driving currents of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED in the LED table lamp so that the spectrum of the reflected light of the paper is close to the saturation of the sunlight spectrum after the light beams emitted by the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED are irradiated on the paper.
7. The system of claim 6, wherein the signal processor comprises:
a signal conversion module for obtaining the reflected light in standard CIE coordinates (X 0 ,Y 0 ) Offset (X) n-0 ,Y n-0 ) Each of said (X n-0 ,Y n-0 ) Corresponding spectrum F n-0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is 1-0 ＝X 1 -X 0 ，X 2-0 ＝X 2 -X 0 ，…，X n-0 ＝X n -X 0 ；Y 1-0 ＝Y 1 -Y 0 ，Y 2-0 ＝Y 2 -Y 0 ，…，Y n-0 ＝Y n -Y 0 ；F 1-0 ＝F 1 -F 0 ，F 2-0 ＝F 2 -F 0 ，…，F n-0 ＝F n -F 0 ；
All of the (X N-0 ,Y N-0 ) Mean value of (X), i.e. X c ＝AVERAGE(X 1-0 :X n-0 ),Y c ＝AVERAGE(Y 1-0 :Y n-0 ) To obtain said (X) c ，Y c ) The method comprises the steps of carrying out a first treatment on the surface of the Said (X) c ，Y c ) Corresponds to the standard CIE coordinates (X 0 ,Y 0 ) The intensity of (a) is that
Calculate all of the F n-0 Mean value of (F) C ＝AVERAGE(F 1-0 ,F n-0 )；
The F is C Light of the corresponding wavelength is used to compensate for the spectrum absorbed by the paper.
8. The system of claim 7, wherein the signal processor further comprises:
and the signal filtering module is connected between the receiving probe and the signal conversion module and is used for filtering noise in the reflected light.
9. The system of claim 7, wherein the dimming driver comprises:
the signal receiving module is connected with the signal conversion module and is used for receiving the signal according to the intensityInformation and said (X) c ，Y c ) Information outputting corresponding pre-stored first current intensity information, and according to the spectrum F C Outputting corresponding second current intensity information by the information; the first current intensity information is used for indicating a current value for driving the warm light LED to emit light and a current value for driving the cold light LED to emit light, and the current value enables the light emitted by the warm light LED and the light emitted by the cold light LED to compensate the intensity after being mixed>The second current intensity information is used for indicating a current value for driving the red light LED to emit light, a current value for driving the blue light LED to emit light and a current value for driving the green light LED to emit lightA current value such that the spectrum of the light generated by mixing the light emitted by the red LED, the blue LED and the green LED is F C ；
And the dimming driving module is connected with the signal receiving module and is used for receiving the first current intensity information to control the current intensity output to the warm light LED and the cold light LED and receiving the second current intensity information to control the current intensity output to the red light LED, the blue light LED and the green light LED.
10. The system of claim 9, wherein the dimming driver further comprises:
and the power amplification module is connected between the dimming driving module and the LED and is used for amplifying the current output by the dimming driving module.
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