CN111065183A - 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 PDF

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CN111065183A
CN111065183A CN201911416879.7A CN201911416879A CN111065183A CN 111065183 A CN111065183 A CN 111065183A CN 201911416879 A CN201911416879 A CN 201911416879A CN 111065183 A CN111065183 A CN 111065183A
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light
led
light led
intensity
spectrum
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CN111065183B (en
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刘贤金
郑永生
侯宇
曾照明
肖国伟
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APT Electronics Co Ltd
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Abstract

The invention relates to the field of movable lighting, and particularly discloses a method and a system for controlling the 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, wherein the standard white light beam is vertical to the surface of the paper; according to CIE coordinates (X) of reflected lightn，Yn) Obtaining reflected light in the standard CIE coordinates (X)0,Y0) Offset amount (X) in (1)c，Yc) And an offset amount (X)c，Yc) Corresponding spectrum FCIntensity of reflected light
Figure DDA0002351411080000011
Relative to the standard white beam intensity
Figure DDA0002351411080000012
Amount of change of
Figure DDA0002351411080000013
According to (X)c，Yc)、FC、
Figure DDA0002351411080000014
And 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 are controlled. The invention obtains (X) of reflected lightc，Yc)、
Figure DDA0002351411080000015
According to (X)c，Yc)、FC、
Figure DDA0002351411080000016
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 spectrum saturation of sunlight, and the eye strain caused by glare due to excessive reflection or diffuse reflection is prevented.

Description

Method and system for controlling illumination intensity of LED table lamp
Technical Field
The invention relates to the field of movable lighting, in particular to a method and a system for controlling the illumination intensity of an LED table lamp.
Background
With the progress of society, the LED illuminating table lamp is deeply popular with reading enthusiasts and students due to the characteristics of energy conservation, mobility, adjustable swing arm and the like, and becomes a preferred product of a desktop reading auxiliary light source. At present, reading materials on the market are more and more diversified, and even if the reading materials are paper reading materials, the materials and the colors of the reading materials are different. The paper made of different materials and colors absorbs and reflects light differently, so that the irradiation intensity of each light system required when the reflected light on the reading material is close to the spectrum saturation of sunlight is different, but the color system and the light intensity of the LED table lamp in the market are fixed and unchanged during illumination, when the fixed light of the LED lamp is not suitable for certain types of paper reading materials, the eyes are over-tired due to glare caused by over reflection or diffuse reflection of the paper, and the eyesight is seriously affected, particularly the eyesight of teenagers and children.
Disclosure of Invention
In order to overcome the defects of 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 illumination intensity matched with the paper reading material according to the material and color of the paper reading material, so that the reflected light on the paper reading material is close to the sunlight spectrum saturation, the visual fatigue caused by excessive reflection or diffuse reflection during reading is relieved, and eyes are protected.
In order to achieve the purpose, the invention adopts the following technical scheme:
emitting a standard white light beam to a paper surface, wherein the standard white light beam is perpendicular to the paper surface;
acquiring reflected light of the standard white light beam on the surface of the paper;
according to the CIE coordinate (X) of the reflected lightn，Yn) Acquiring the reflected light in the standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)c，Yc) The above-mentioned (X)c，Yc) Corresponding spectrum FCAnd the intensity of said reflected light
Figure BDA0002351411060000011
Light intensity relative to the standard white light beam
Figure BDA0002351411060000012
Amount of change of
Figure BDA0002351411060000013
According to (X)c，Yc)、FC、
Figure BDA0002351411060000014
And 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 desk 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 irradiate on the paper.
Preferably, the standard white light beam comprises a plurality of beams, and each beam corresponds to one reflected light;
the CIE coordinate (X) according to the reflected lightn，Yn) Acquiring the reflected light in the standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)c，Yc) And the intensity of the reflected light
Figure BDA0002351411060000015
Relative to the standard white beam intensity
Figure BDA0002351411060000016
Amount of change of
Figure BDA0002351411060000017
The method comprises the following steps:
obtaining each of said reflected light at standard CIE coordinates (X)0,Y0) Offset amount (X) in (1)n-0,Yn-0) (ii) a Wherein, X1-0＝X1-X0，X2-0＝X2-X0，…，Xn-0＝Xn-X0；Y1-0＝Y1-Y0，Y2-0＝Y2-Y0，…，Yn-0＝Yn-Y0；
Calculating all of (X)N-0,YN-0) Mean value of (i.e. X)c＝AVERAGE(X1-0:Xn-0),Yc＝AVERAGE(Y1-0:Yn-0) To obtain said (X)c，Yc)；
Said (X)c，Yc) Corresponding to the standard CIE coordinate (X)0,Y0) Is the intensity of
Figure BDA0002351411060000021
Preferably, the offset (X) is obtainedc，Yc) Corresponding spectrum FCThe method comprises the following steps:
obtaining each of (X)n-0,Yn-0) Corresponding spectrum Fn-0(ii) a Wherein, F1-0＝F1-F0，F2-0＝F2-F0，…，Fn-0＝Fn-F0；
Calculating all of said Fn-0Mean value of (i), i.e. FC＝AVERAGE(F1-0,Fn-0)；
Said FCThe light of the corresponding wavelength is used to compensate the spectrum absorbed by the paper.
Preferably, said is according to (X)c，Yc)、FC、
Figure BDA0002351411060000022
The method for controlling the driving current 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 desk lamp comprises the following steps:
according to the light intensity difference
Figure BDA0002351411060000023
Information and said (X)c，Yc) The information output corresponds to prestored 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 values enable the light emitted by the warm light LED and the cold light LED to be mixed to compensate the light intensity difference
Figure BDA0002351411060000024
Preferably, the method further comprises the following steps: according to said spectrum FCOutputting corresponding second current intensity information; the second current intensity signal 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 values enable the spectrum of light generated by mixing the light emitted by the red light LED, the light emitted by the blue light LED and the light emitted by the green light LED to be FC。
The invention also discloses a system for controlling the illumination intensity of the LED table lamp, which comprises the following components:
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 vertical 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 and used for processing the CIE coordinate (X) of the reflected lightn，Yn) Acquiring the reflected light in the standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)c，Yc) And the (X)c，Yc) Corresponding spectrum FCIntensity of the reflected light
Figure BDA0002351411060000025
Light intensity relative to the standard white light beam
Figure BDA0002351411060000026
Amount of change of
Figure BDA0002351411060000027
A dimming driver connected with the signal processing module and the LED for adjusting the dimming according to the (X)c，Yc)、FC、
Figure BDA0002351411060000028
And 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 desk 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 irradiate on the paper.
Preferably, the signal conversion module is configured to obtain a standard CIE coordinate (X) of each of the reflected lights0,Y0) Offset amount (X) in (1)n-0,Yn-0) Each of (X) ton-0,Yn-0) Corresponding spectrum Fn-0(ii) a Wherein, X1-0＝X1-X0，X2-0＝X2-X0，…，Xn-0＝Xn-X0；Y1-0＝Y1-Y0，Y2-0＝Y2-Y0，…，Yn-0＝Yn-Y0；F1-0＝F1-F0，F2-0＝F2-F0，…，Fn-0＝Fn-F0；
Calculating all of (X)N-0,YN-0) Mean value of (i.e. X)c＝AVERAGE(X1-0:Xn-0),Yc＝AVERAGE(Y1-0:Yn-0) To obtain said (X)c，Yc) (ii) a Said (X)c，YcCorresponding to the standard CIE coordinate (X)0,Y0) Is the intensity of
Figure BDA0002351411060000031
Calculating all of said Fn-0Mean value of (i), i.e. FC＝AVERAGE(F1-0,Fn-0)；
Said FCThe light of the corresponding wavelength is used to compensate 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:
a signal receiving module connected with the signal conversion module and used for receiving the light intensity difference
Figure BDA0002351411060000032
Information and said (X)c，Yc) Outputting corresponding pre-stored first current intensity information according to the information, and outputting the corresponding pre-stored first current intensity information according to the spectrum FCOutputting corresponding second current intensity information; the first current intensity information is used for indicating the current value for driving the warm light LED to emit light and the current value for driving the cold light LED to emit lightA current value which enables the light emitted by the warm light LED and the cold light LED to be mixed so as to compensate the light intensity difference
Figure BDA0002351411060000033
The second current intensity signal 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 values enable the spectrum of light generated by mixing the light emitted by the red light LED, the light emitted by the blue light LED and the light emitted by the green light LED to be FC。
And the dimming driving module is connected with the signal receiving module and 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 comprises:
and the power amplification module is connected between the dimming driving module and the LED and used for amplifying the current output by the dimming driving module.
Compared with the prior art, the invention has the beneficial effects that:
the CIE coordinate (X) of the reflected light is obtained by comparing the reflected light with the original standard white light beamn，Yn) Average offset (X) ofc，Yc) By CIE coordinates (X)c，Yc) Obtaining the light intensity variation of the reflected light
Figure BDA0002351411060000034
At 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，Yc)、(Xc，Yc) Corresponding spectrum FCAmount of change of
Figure BDA0002351411060000035
The luminous intensities of the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED are controlled, so that the warm light LED, the cold light LED, the red light LED, the blue light LED and the green light LED emit lightThe light energy compensates the color light absorbed by the paper and compensates the enhancement degree or the attenuation degree of the reflected light, so that the spectrum corresponding to the reflected light on the paper is close to the spectrum saturation degree of sunlight, the eye strain 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 embodiments thereof:
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a system block diagram of the present invention;
FIG. 3 is a schematic structural diagram of a PCBA module according to the present invention;
FIG. 4 is a schematic diagram of the structure of an inductive probe of the present invention;
fig. 5 is a schematic structural diagram of the LED table lamp of the invention.
In the figure:
1. a signal processor for processing the received signals and the received signals,
11. signal generating module 12, signal filtering module 13, signal conversion module 14, signal processor power supply module
2. A dimming driver for driving the light source to a dimming state,
21. a power amplification module 22, a dimming driving module 23, a signal receiving module 24, a dimming driver power supply module,
3. a PCB base, a PCB base and a PCB,
31. the detection probe comprises a detection probe body, a detection probe head 32, a warm light LED, a detection probe 33, a cold light LED, a detection probe 34, a red light LED, a detection probe 35, a green light LED, a detection probe 36, a blue light LED, a detection probe 311, an emission probe 312, a receiving probe 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 in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example one
As shown in fig. 1, the present embodiment discloses a method for controlling the illumination intensity of an LED desk lamp, which includes the following steps:
s1: emitting a standard white light beam to the surface of the paper 4, wherein the standard white light beam is vertical to the surface of the paper 4;
s2: acquiring reflected light of the standard white light beam on the surface of the paper 4;
s3: according to CIE coordinates (X) of reflected lightn，Yn) Obtaining reflected light in the standard CIE coordinates (X)0,Y0) Offset amount (X) in (1)c，Yc) Offset amount (X)c，Yc) Corresponding spectrum FCAnd the intensity of the reflected light
Figure BDA0002351411060000041
Light intensity relative to a standard white light beam
Figure BDA0002351411060000042
Amount of change of
Figure BDA0002351411060000043
S4: according to (X)c，Yc)、FC、
Figure BDA0002351411060000051
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 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 sunlight spectrum saturation.
Compared with the prior art, the CIE coordinate (X) of the reflected light is obtained by comparing the reflected light with the original standard white light beamn，Yn) Average offset (X) ofc，Yc) By CIE coordinates (X)c，Yc) Obtaining the light intensity variation of the reflected light
Figure BDA0002351411060000052
The LED desk lamp is at least provided with a warm light LED32, a cold light LED33, a red light LED34, a blue light LED36 and a green light LED35,according to (X)c，Yc)、(Xc，Yc) Corresponding spectrum FCAmount of change of
Figure BDA0002351411060000053
The luminous intensities of the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 are controlled, so that the light emitted by the warm light LED32, the cold light LED33, the red light LED34, the blue light LED36 and the green light LED35 can compensate the color light absorbed by the paper 4 and the enhancement degree or attenuation degree of the reflected light, the spectrum corresponding to the reflected light on the paper 4 is close to the spectrum saturation degree of sunlight, the excessive fatigue of eyes caused by glare due to 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 beam of the standard white light beam corresponds to one reflected light; step S2 includes:
obtaining each reflected light in a standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)n-0,Yn-0) (ii) a Wherein, X1-0＝X1-X0，Y1-0＝Y1-Y0；X2-0＝X2-X0，Y2-0＝Y2-Y0；…；Xn-0＝Xn-X0，Yn-0＝Yn-Y0；
Calculate all (X)N-0,YN-0) Mean value of (i.e. X)c＝AVERAGE(X1-0:Xn-0),Yc＝AVERAGE(Y1-0:Yn-0) To obtain (X)c，Yc)；
(Xc，Yc) Corresponding to the standard CIE coordinate (X)0,Y0) Of intensity of
Figure BDA0002351411060000054
And:
obtain each (X)n-0,Yn-0) Corresponding spectrum Fn-0(ii) a Wherein, F1-0＝F1-F0，F2-0＝F2-F0，…，Fn-0＝Fn-F0；
Calculate all Fn-0Mean value of (i), i.e. FC＝AVERAGE(F1-0,Fn-0)；
FCThe light of the corresponding wavelength is used to compensate the spectrum absorbed by the paper 4.
Or:
acquiring coordinates of (X)n，Yn) Intensity of reflected light of (2)
Figure BDA0002351411060000055
And the coordinate is (X)0,Y0) The illumination intensity of the standard light beam
Figure BDA0002351411060000056
Difference of (2)
Figure BDA0002351411060000057
(i.e. the
Figure BDA0002351411060000058
) Calculating
Figure BDA0002351411060000059
I.e. the mean value of the differences between all reflected light and the standard beam illumination intensity is obtained.
If the color of the paper 4 is light yellow, when the standard white light impinges on the light yellow paper 4, the light yellow paper 4 absorbs part of yellow light in the standard white light, and the CIE coordinate of the reflected light after the absorbed part of yellow light is (X)n,Yn) CIE coordinate (X) of standard white light0,Y0) Is (X)n-X0,Yn-Y0) (ii) a Offset (X)n-X0,Yn-Y0) Corresponding to the standard CIE coordinate (X)0,Y0) The chromaticity of the light is the absorbed color light, and meanwhile, the illumination intensity of the reflected light is obtained
Figure BDA0002351411060000061
Intensity of illumination with standard light beam
Figure BDA0002351411060000062
By a difference of
Figure BDA0002351411060000063
(i.e. the
Figure BDA0002351411060000064
) Offset (X)n-X0,Yn-Y0) Corresponding spectrum is FN. According to the offset (X)n-X0,Yn-Y0) Poor strength
Figure BDA0002351411060000065
Controlling the magnitude of the driving current of the warm light LED32 and the cold light LED33 according to the spectrum FNControlling the magnitude of the driving current of the red LED34, the blue LED36, and the green LED 35; the light emitting 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 by controlling the current, 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 offset
Figure BDA0002351411060000066
The light of (2) further, make warm light, cold light, ruddiness, blue light, green glow on paper 4 go into to mix and the light that generates has supplemented the absorbed chromatic light for the spectrum of the reflection light on paper 4 is close to sunlight spectral saturation, and then realizes that eyes are under the light environment that is close to sunlight all the time, alleviates eye fatigue, and then protects eyes.
In the present embodiment, in order to improve accuracy and reliability, (X) is obtained by obtaining a plurality of reflected lightsc，Yc)、FC、
Figure BDA0002351411060000067
Regarding the difference between the intensity of the reflected light and the intensity of the standard white light, the coordinate is assumed to be (X)n，Yn) Illumination intensity of reflected light of (2)Degree of
Figure BDA0002351411060000068
The standard white light beam has an illumination intensity of
Figure BDA0002351411060000069
Illumination intensity compared to standard light beam
Figure BDA00023514110600000610
The intensity of reflected light is increased by
Figure BDA00023514110600000611
Is a physical vector, such as when the surface of the paper 4 is covered with a highly reflective material such as a plastic film,
Figure BDA00023514110600000612
will be a positive value when there is no film on the surface of the paper 4
Figure BDA00023514110600000613
Either a positive or a negative value. Therefore, when
Figure BDA00023514110600000614
When the value is negative, it is indicated that the intensity of the reflected light from the sheet 4 is too small, and the intensity of the light emitted from the warm light LED32 and the cold light LED33 is increased to increase the intensity of the light emitted from the warm light LED32 and the cold light LED33, so that the reflected light from the sheet 4 is increased and the increased reflected light cancels out the increased reflected light
Figure BDA00023514110600000615
Ensuring that the spectrum of the reflected light is close to the spectrum saturation of the sunlight; when in use
Figure BDA00023514110600000616
When the value is positive, the intensity of the reflected light from the sheet 4 is too large, and the light intensities of the warm light LED32 and the cool light LED33 are decreased to reduce the illuminance on the sheet 4, i.e., the reflected light from the sheet 4 is reduced, and the reduced reflected light is added to the reduced reflected light
Figure BDA00023514110600000617
The spectrum of the reflected light is close to the sunlight spectral saturation.
In the present embodiment, step S4 includes:
according to the light intensity difference
Figure BDA00023514110600000618
Information and said (X)c，Yc) The information output corresponds to prestored 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 values enable the light emitted by the warm light LED and the cold light LED to be mixed to compensate the light intensity difference
Figure BDA00023514110600000619
According to said spectrum FCOutputting corresponding second current intensity information; the second current intensity signal 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 values enable the spectrum of light generated by mixing the light emitted by the red light LED, the light emitted by the blue light LED and the light emitted by the green light LED to be FC。
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 command includes an offset coordinate value (X)N,YN) Information, spectrum FC1Information, light intensity difference
Figure BDA0002351411060000071
Information, coordinate value (X)N,YN) Information and light intensity difference
Figure BDA0002351411060000072
First current intensity information and spectrum F corresponding to informationC1Second current intensity information corresponding to the information;
comparison (X)c,Yc) And (X)N,YN) When (X)c,Yc) And (X)N,YN) Is less than a first preset value, (X) is obtainedN,YN) Corresponding first current intensity information to control the current intensity output to the warm light LED32, the cool light LED 33;
comparison FCAnd FC1When F isCAnd FC1When the difference value of (A) is less than a second preset value, F is obtainedC1Corresponding second current intensity information to control the current intensity output to the red LED34, the blue LED36, and the green LED 35.
If the control command carries the offset (X) in step S2c，Yc) Information, spectrum FCInformation, light intensity difference
Figure BDA0002351411060000073
Information, such as a control command, carries the offset (X) in step S2c，Yc) Information, spectrum FCInformation, light intensity difference
Figure BDA0002351411060000074
The information is transmitted to the mobile station via the wireless,
for example, when the offset coordinate value (X) of a control signal command is retrievedN3,YN3) Information and (X)3，Y3) Difference of (2)<At 0.0001, default offset coordinate value (X) of systemN3,YN3) Corresponding control signal command and (X)3，Y3) Are completely matched; extracting shift coordinate value (X)N3,YN3) Corresponding control signals are commanded to control the drive currents of warm light LED32 and cool light LED 33.
Or:
when the offset coordinate value (X) is searchedN,YN) The control signal command packet and the coordinate value (X) in the memory bankN1,YN1) Differences between control instruction packets<At 0.0001, default offset coordinate value (X) of systemN,YN) The control signal command packet and the coordinate value (X) in the memory bankN1,YN1) The control command packet of (a) is perfectly matched;
when spectrum F is retrievedCInformation control signal command packet andspectra of the library FC1System default F when binary encoding between control instruction packets is within 4 bytesCSpectrum F of information control signal command packet and memory bankC1The control command packets being perfectly matched
When the intensity of the illumination is retrieved
Figure BDA0002351411060000075
Control signal command packet of information and illuminance in memory bank
Figure BDA0002351411060000076
When the difference value between the control command packets is less than 0.001, the system defaults the illumination intensity
Figure BDA0002351411060000077
Control signal command packet of information and illuminance in memory bank
Figure BDA0002351411060000078
The control command packet is perfectly matched;
therefore, the control signal command includes the coordinate value (X)N1,YN1) Control instruction packet and spectrum FC1Control command packet and illuminance
Figure BDA0002351411060000079
A control command packet for controlling CIE coordinate (X)N,YN) And illuminance
Figure BDA00023514110600000710
Corresponding current intensity signals and output spectra F of the warm light LED32 and the cold light LED33CCorresponding current intensity signals of the red LED34, the blue LED36 and the green LED 35;
example two
As shown in fig. 2, the present embodiment discloses a system for controlling the illumination intensity of an LED desk lamp, which includes:
the LEDs comprise a warm light LED32, a cold light LED33, a red light LED34, a blue light LED36 and a green light LED 35;
the emission probe 311 is used for emitting a standard white light beam to the surface of the paper 4, and the standard white light beam is vertical 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;
a signal processor 1 connected to the transmitting probe 311 and the receiving probe 312 for processing the CIE coordinates (X) of the reflected lightn，Yn) Obtaining reflected light in the standard CIE coordinates (X)0,Y0) Offset amount (X) in (1)c，Yc) And (X)c，Yc) Corresponding spectrum FCIntensity of reflected light
Figure BDA0002351411060000081
Light intensity relative to a standard white light beam
Figure BDA0002351411060000082
Amount of change of
Figure BDA0002351411060000083
A dimming driver 2 connected with the signal processing module, the LED, for adjusting the output voltage according to (X)c，Yc)、FC、
Figure BDA0002351411060000084
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 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 sunlight spectrum saturation.
In this 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 a standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)n-0,Yn-0) Each of (X)n-0,Yn-0) Corresponding spectrum Fn-0(ii) a Wherein, X1-0＝X1-X0，X2-0＝X2-X0，…，Xn-0＝Xn-X0；Y1-0＝Y1-Y0，Y2-0＝Y2-Y0，…，Yn-0＝Yn-Y0；F1-0＝F1-F0，F2-0＝F2-F0，…，Fn-0＝Fn-F0；
Calculate all (X)N-0,YN-0) Mean value of (i.e. X)c＝AVERAGE(X1-0:Xn-0),Yc＝AVERAGE(Y1-0:Yn-0) To obtain (X)c，Yc)；(Xc，YcCorresponding to the standard CIE coordinate (X)0,Y0) Of intensity of
Figure BDA0002351411060000085
Calculate all Fn-0Mean value of (i), i.e. FC＝AVERAGE(F1-0,Fn-0)；
FCThe light of the corresponding wavelength is used to compensate the spectrum absorbed by the paper 4.
In the present embodiment, the signal processor 1 further includes:
and a signal filtering module 12 connected between the receiving probe 312 and the signal conversion module 13 for filtering noise in the reflected light.
In the present embodiment, the dimming driver 2:
a signal receiving module 23 connected to the signal conversion module 13 for receiving the light intensity difference
Figure BDA0002351411060000086
Information and said (X)c，Yc) Outputting corresponding pre-stored first current intensity information according to the information, and outputting the corresponding pre-stored first current intensity information according to the spectrum FCOutputting corresponding second 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 values enable the light emitted by the warm light LED and the cold light LED to be mixed to compensate the light intensity difference
Figure BDA0002351411060000087
The second current intensity signal 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 values enable the spectrum of light generated by mixing the light emitted by the red light LED, the light emitted by the blue light LED and the light emitted by the green light LED to be FC。
And the dimming driving module 22 is connected with the signal receiving module 23 and is used for receiving the first current intensity information to control the current intensity output to the warm light LED32 and the cool light LED33, and receiving 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，Yc) Information, FCInformation, a,
Figure BDA0002351411060000091
Information;
a control signal instruction set is stored in the signal receiving module 23;
the control signal command includes an offset coordinate value (X)N,YN) Information, spectrum FC1Information, light intensity difference
Figure BDA0002351411060000092
Information, (X)N,YN)、
Figure BDA0002351411060000093
Corresponding first current intensity information, FC1Corresponding second current intensity information;
the signal receiving module 23 is connected with the signal conversion module 13 for comparison (X)c,Yc) And (X)N,YN) When (X)c,Yc) And (X)N,YN) Is less than the first preset value, (X) isN,YN) Corresponding control signal instructions are 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 cool light LED 33; and comparison FCAnd FC1When F isCAnd FC1When the difference value of F is less than the second preset value, F is setC1The corresponding control signal command is sent to the dimming driving module 22, so that the dimming driving module 22 controls the current intensity output to the red LED34, the blue LED36, and the green LED 35.
In this embodiment, the dimming driver 2 further includes:
and the power amplification module 21 is connected between the dimming driving module 22 and the LED, and is configured to amplify the current output by the dimming driving module 22.
In this embodiment, the method further includes: the system comprises 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 commercial power in parallel through a C11 wire harness, so that the signal processor 1 is kept in a working state; the dimming driver 2 power supply module 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 an operating state.
The signal generating module 11 and the transmitting probe 311 are used for controlling the times of transmitting the standard white light beam by the transmitting probe 311. 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 solved, so that the accuracy and the effectiveness of data are improved.
EXAMPLE III
The embodiment discloses an LED table lamp, which comprises the system of the second embodiment,
in this embodiment, the detecting probe 31 is included, the detecting probe 31 includes a transmitting probe 311, a receiving probe 312, a fixing base, and a hemispherical lens 313, the transmitting probe 311, the receiving probe 312, and the hemispherical lens 313 are mounted on the fixing base, and the transmitting probe 311 and the receiving probe 312 are located in the hemispherical lens 313
In this embodiment, the device further comprises a PCB base 3, and the LED and the detection probe 31 are mounted on the PCB base 3; the red light LED34, the blue light LED36 and the green light LED35 are arranged in the middle of the PCB base 3, the warm light LED32 and the cold light LED33 are arranged at two ends of the PCB base 3, and the warm light LED32 and the cold light LED33 are arranged at intervals; the inspection probe 31 is mounted on the end of the PCB base 3.
The LED table lamp in the embodiment comprises a supporting seat 6, a bendable supporting rod 5 and a lampshade 7; one end of the support rod 5 is fixed on the support 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 the embodiment, the red light LED34, the blue light LED36 and the green light LED35 are arranged in the middle of the PCB base 3, so that the uniformity of the red light, the blue light and the green light hitting each position of the paper 4 is the same, and the red light, the blue light and the green light at 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 realize the light compensation of the paper 4; warm light LED32, cold light LED33 interval set up for the intensity of the warm light of hitting on each position of paper 4 and the cold light mixed light is the same, has guaranteed that the light intensity on each position of paper 4 is the same promptly, guarantees the comfort of vision, reduces eye fatigue.
The present invention is not limited to the above-described embodiments, and various changes and modifications of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims (10)

1. A method for controlling the illumination intensity of an LED table lamp is characterized by comprising the following steps:
emitting a standard white light beam to a paper surface, wherein the standard white light beam is perpendicular to the paper surface;
acquiring reflected light of the standard white light beam on the surface of the paper;
according to the CIE coordinate (X) of the reflected lightn，Yn) Acquiring the reflected light in the standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)c，Yc) The above-mentioned (X)c，Yc) Corresponding spectrum FCAnd the intensity of said reflected light
Figure FDA0002351411050000014
Light intensity relative to the standard white light beam
Figure FDA0002351411050000011
Amount of change of
Figure FDA0002351411050000012
According to (X)c，Yc)、FC、
Figure FDA0002351411050000013
And 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 desk 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 irradiate on the paper.
2. The method for controlling the illumination intensity of an LED desk lamp as claimed in claim 1, wherein the standard white light beam comprises several beams, each beam corresponding to one reflected light;
the CIE coordinate (X) according to the reflected lightn，Yn) Acquiring the reflected light in the standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)c，Yc) And the intensity of the reflected light
Figure FDA0002351411050000015
Relative to the standard white beam intensity
Figure FDA0002351411050000016
Amount of change of
Figure FDA0002351411050000017
The method comprises the following steps:
obtaining each of said reflected light at standard CIE coordinates (X)0,Y0) Offset amount (X) in (1)n-0,Yn-0) (ii) a Wherein, X1-0＝X1-X0，X2-0＝X2-X0，…，Xn-0＝Xn-X0；Y1-0＝Y1-Y0，Y2-0＝Y2-Y0，…，Yn-0＝Yn-Y0；
Calculating all of (X)N-0,YN-0) Mean value of (i.e. X)c＝AVERAGE(X1-0:Xn-0),Yc＝AVERAGE(Y1-0:Yn-0) To obtain said (X)c，Yc)；
Said (X)c，Yc) Corresponding to the standard CIE coordinate (X)0,Y0) Is the intensity of
Figure FDA0002351411050000018
3. Method for controlling the illumination intensity of an LED desk lamp according to claim 2, characterized in that the obtaining the offset (X)c，Yc) Corresponding spectrum FCThe method comprises the following steps:
obtaining each of (X)n-0,Yn-0) Corresponding spectrum Fn-0(ii) a Wherein, F1-0＝F1-F0，F2-0＝F2-F0，…，Fn-0＝Fn-F0；
Calculating all of said Fn-0Mean value of (i), i.e. FC＝AVERAGE(F1-0,Fn-0)；
Said FCThe light of the corresponding wavelength is used to compensate the spectrum absorbed by the paper.
4. Method for controlling the illumination intensity of an LED desk lamp according to claim 3, characterized in that, the method is based on (X)c，Yc)、FC、
Figure FDA0002351411050000019
Control the drive power of warm light LED, cold light LED, red light LED, blue light LED and green light LED in LED table lampA streaming step, comprising the steps of:
according to the light intensity difference
Figure FDA00023514110500000110
Information and said (X)c，Yc) The information output corresponds to prestored 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 values enable the light emitted by the warm light LED and the cold light LED to be mixed to compensate the light intensity difference
Figure FDA0002351411050000021
5. The method for controlling the illumination intensity of the LED table lamp according to claim 4, further comprising:
according to said spectrum FCOutputting corresponding second current intensity information; the second current intensity signal 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 values enable the spectrum of light generated by mixing the light emitted by the red light LED, the light emitted by the blue light LED and the light emitted by the green light LED to be FC。
6. A system for controlling the illumination intensity 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 vertical 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 and used for processing the CIE coordinate (X) of the reflected lightn，Yn) Acquiring the reflected light in the standard CIE coordinate (X)0,Y0) In (1)Offset (X)c，Yc) And the (X)c，Yc) Corresponding spectrum FCIntensity of the reflected light
Figure FDA0002351411050000022
Light intensity relative to the standard white light beam
Figure FDA0002351411050000023
Amount of change of
Figure FDA0002351411050000024
A dimming driver connected with the signal processing module and the LED for adjusting the dimming according to the (X)c，Yc)、FC、
Figure FDA0002351411050000025
And 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 desk 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 irradiate on the paper.
7. The system of claim 6, wherein the signal processor comprises:
a signal conversion module for obtaining each reflected light in a standard CIE coordinate (X)0,Y0) Offset amount (X) in (1)n-0,Yn-0) Each of (X) ton-0,Yn-0) Corresponding spectrum Fn-0(ii) a Wherein, X1-0＝X1-X0，X2-0＝X2-X0，…，Xn-0＝Xn-X0；Y1-0＝Y1-Y0，Y2-0＝Y2-Y0，…，Yn-0＝Yn-Y0；F1-0＝F1-F0，F2-0＝F2-F0，…，Fn-0＝Fn-F0；
Calculating all of (X)N-0,YN-0) Mean value of (i.e. X)c＝AVERAGE(X1-0:Xn-0),Yc＝AVERAGE(Y1-0:Yn-0) To obtain said (X)c，Yc) (ii) a Said (X)c，Yc) Corresponding to the standard CIE coordinate (X)0,Y0) Is the intensity of
Figure FDA0002351411050000026
Calculating all of said Fn-0Mean value of (i), i.e. FC＝AVERAGE(F1-0,Fn-0)。
Said FCThe light of the corresponding wavelength is used to compensate 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:
a signal receiving module connected with the signal conversion module and used for receiving the light intensity difference
Figure FDA0002351411050000027
Information and said (X)c，Yc) Outputting corresponding pre-stored first current intensity information according to the information, and outputting the corresponding pre-stored first current intensity information according to the spectrum FCOutputting corresponding second 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 values enable the light emitted by the warm light LED and the cold light LED to be mixed to compensate the light intensity difference
Figure FDA0002351411050000031
The second current intensity signal 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 values enable the spectrum of light generated by mixing the light emitted by the red light LED, the light emitted by the blue light LED and the light emitted by the green light LED to be FC。
And the dimming driving module is connected with the signal receiving module and 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 8, wherein the dimming driver further comprises:
and the power amplification module is connected between the dimming driving module and the LED and used for amplifying the current output by the dimming driving module.
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