JP4425557B2 - Lighting control device and LED lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an LED lighting apparatus and a light emitting diode (hereinafter, referred to as “LED”) that are used for, for example, a stand lamp installed on a desk or a foot lamp installed on a front door or the like. The present invention relates to an illumination control device that performs light control.
[0002]
[Prior art]
A conventional lighting device (LED lighting device) includes a plurality of LEDs dispersed in at least a two-dimensional direction, a transparent resin layer integrally covering the plurality of LEDs, and the inside, surface, or vicinity of the transparent resin layer. A light detection unit that detects the light emission intensity of the LED by a light detection element disposed in the light source, and a power supply circuit unit that controls driving of the LED based on a detection output from the light detection unit. However, the light detection element detects the light emission intensity of the LED propagating through the transparent resin layer (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2002-344031 A (page 3-4, FIGS. 1 and 2B)
[0004]
[Problems to be solved by the invention]
In the conventional LED lighting device (lighting device) as described above, the LEDs are sequentially turned on with a pulse voltage for each emission color, and the light detection unit is synchronized with the lighting timing by the number of light detection elements equal to or less than the number of emission colors. By performing light detection in this way, light detection is performed using a light detection element for a plurality of emission colors. In other words, for example, by emitting LEDs with respective emission colors in the order of red, blue, and green, and monitoring the output voltage from the photodetector at the same timing, the output ratio of each light color can be determined. By controlling the driving of the LED so that the predetermined value is set, it is possible to obtain a desired color tone or obtain a certain light emission intensity.
[0005]
However, the conventional LED lighting device adjusts the color by detecting the light with one light detection element for, for example, red, blue, and green LEDs, so that the timing of the light detection of each color LED is timed. I'm going staggered. That is, while the red LED is lit, the blue and green LEDs are extinguished, and the light detection element detects only the red LED. As a result, even an LED that can output 100% power at one timing (one cycle) must consider the output ratio with other LEDs, and therefore cannot output 100% power. In addition, if the output cannot be effectively used for each LED that can output 100% in one cycle, the LED originally has low luminance, and thus there is a problem that the lighting device has low illuminance. On the other hand, in order to obtain a constant illuminance, a plurality of LEDs that are not effectively output must be used, which increases the cost.
[0006]
The present invention has been made in order to solve the above-described problems, and an illumination control device and LED illumination capable of obtaining a predetermined illuminance with a predetermined luminance by effectively utilizing the output of the LED to extend the life. The object is to provide an apparatus.
[0007]
[Means for Solving the Problems]
An illumination control device according to the present invention is a lighting control device that has a plurality of LED groups for each emission color and performs dimming control on each light emitting unit that emits a set color, and monitors each emission color LED, each light receiving unit that receives light from each monitor LED, and a light signal corresponding to each light received by each light receiving unit corresponds to a predetermined illuminance and a set color A signal generation unit that generates a signal to each light emitting unit so as to have a signal level; and a signal generated by the signal generation unit is converted into a driving current of each light emitting unit to each light emitting unit and each monitor And a means for outputting to each of the LEDs .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. In the figure, an LED lighting device 1 such as a stand installed on a desk or the like includes a red LED light emitting unit 2 composed of a plurality of red LED groups, a blue LED light emitting unit 3 composed of a plurality of blue LED groups, and a plurality of green LEDs. The group of green LED light emitting units 4 and the light emitted from each of the light emitting units 2 to 4 (light in which three colors are mixed) are received, and an optical signal corresponding to the received light is output to the illumination control device 6. And a light receiving portion 5 having a light receiving element made of, for example, a photodiode. The light receiving unit 5 is effective when incorporated in the LED lighting device 1 as described above when the power of each of the light emitting units 2 to 4 is small. May be provided separately from the LED lighting device 1.
[0009]
The illumination control device 6 is set by an A / D converter 7 that converts an optical signal into a digital signal, a dimming rate (brightness) corresponding to the converted digital signal, and a target dimming rate setting unit 8. Comparing the target dimming rate (for example, 70% brightness) and outputting the difference, the comparison result (difference) from the comparator 9 and the information of the color balance table stored in the storage unit 10 Based on the signal generation unit 11 that generates signals to the light emitting units 2 to 4 so that each of the light emitting units 2 to 4 has a signal level corresponding to the target dimming rate, and the generated light emitting units 2 to 4. And D / A converters 12 to 14 that convert the signals corresponding to the analog signals, and amplifiers 15 to 17 that convert the converted signals into drive currents of the light emitting units 2 to 4 and output them. In the first embodiment, as the information of the color balance table stored in the storage unit 10, when the LED lighting device 1 emits white light, the standard white balance information is stored. If not limited to white, a color setting unit 18 that can be set to any color is provided in the illumination control device 6, and the color balance set by the color setting unit 18 is calculated and stored in the storage unit 10. Moreover, although an arbitrary target dimming rate is set by the target dimming rate setting unit 8, the target dimming rate may be fixed in advance.
[0010]
When the LED lighting device 1 and the lighting control device 6 according to Embodiment 1 configured as described above are used to dimm the desk top to a predetermined illuminance, first, the target dimming rate setting unit 8 performs the target dimming. The light rate (70% here) is set. This setting may be performed only for the first time. Next, the light receiving unit 5 of the LED lighting device 1 receives the light emitted from the light emitting units 2 to 4 and outputs an optical signal corresponding to the light to the illumination control device 6. After the light control device 6 converts the optical signal into a digital signal by the A / D converter 7, the comparator 9 determines whether the light control rate corresponding to the signal is the set target light control rate (70%). Compare and output the difference to the signal generator 11. Based on the comparison result (difference) and the white balance information stored in the storage unit 10, the signal generation unit 11 balances the light emitted from the light emitting units 2 to 4 in white and the dimming rate is 70. Signals to the light emitting units 2 to 4 are generated so that the signal level becomes%. The generated signals are converted into analog signals, converted into drive currents by the amplifiers 15 to 17 of the respective colors, and output to the light emitting units 2 to 4, respectively. And each light emission part 2-4 light-emits light according to the input drive current.
[0011]
Next, the light receiving unit 5 receives light that is dimmed and emitted from each of the light emitting units 2 to 4, and outputs an optical signal corresponding to the light to the illumination control device 6. Next, the illumination control device 6 performs dimming so as to achieve the target dimming rate (70%) in which the optical signal is set again as described above. Then, such dimming control is repeatedly performed so that the desk is dimmed to a predetermined illuminance. Further, when the target dimming rate is changed by the target dimming rate setting device 8, the dimming is performed so that the changed target dimming rate is obtained.
[0012]
As described above, the light emitted from each of the light emitting units 2 to 4 is received by the light receiving unit 5 so that the signal level corresponds to the target dimming rate (brightness) in which the optical signal corresponding to the light is set. Since the light is dimmed, the power of each of the light emitting units 2 to 4 can be effectively used to make the illuminated surface such as a desk a predetermined illuminance. Moreover, although the power of each light emission part 2-4 is used effectively, since it can be made not to use power uselessly, maintaining predetermined illumination intensity, the lifetime of each light emission part 2-4, ie, LED, is lengthened. Can do. Furthermore, since the target dimming rate can be arbitrarily set, a predetermined luminance can be obtained for the LED lighting device 1 and the appearance of the illuminated surface and the LED lighting device 1 has the same brightness. can do.
[0013]
Embodiment 2. FIG.
FIG. 2 is a block diagram showing the configuration of the second embodiment of the present invention. In the LED lighting device 1 according to the first embodiment, the second embodiment receives each light emitted from each of the light emitting units 2 to 4 and sends an optical signal corresponding to the received light to the illumination control device 6. A red light receiving unit 21, a blue light receiving unit 22, and a green light receiving unit 23 that output are provided corresponding to the light emitting units 2 to 4. Moreover, this Embodiment 2 is the illumination control apparatus 6 which concerns on Embodiment 1, A / D converter 24-26 which each converts each optical signal from each light-receiving part 21-23 into a digital signal, Comparators 27 to 29 that compare the dimming rate corresponding to each converted digital signal with the target dimming rate set by the target dimming rate setting unit 8 and output the difference to the signal generation unit 11 are provided. It is a thing.
For example, the red light receiving unit 21 and the red LED light emitting unit 2, and the blue light receiving unit 22 and the blue LED light emission so that each of the light receiving units 21 to 23 does not receive light other than the corresponding light emitting units 2 to 4. The unit 3, the green light receiving unit 23, and the green / red LED light emitting unit 4 may be installed so as to be separated from each other by color, and the red light receiving unit 21 is installed in the red LED light emitting unit 2. You may make it install each light-receiving part 21-23 in the parts 2-4.
[0014]
Using the LED lighting device 1 and the lighting control device 6 according to the second embodiment configured as described above, the case where the desk light is dimmed to a predetermined illuminance is almost the same as the case described in the first embodiment. First, the target dimming rate setting unit 8 sets the target dimming rate (70%). Next, each light receiving unit 21 to 23 of the LED lighting device 1 individually receives each light emitted from each light emitting unit 2 to 4, and sends each light signal corresponding to each received light to the illumination control device 6. Output each. The illumination control device 6 converts each optical signal into a digital signal by the A / D converters 24 to 26, and then compares whether the dimming rate corresponding to each signal is the set target dimming rate (70%). Each of the units 27 to 29 is compared, and each difference is output to the signal generator 11. Based on the comparison result (each difference) and the white balance information stored in the storage unit 10, the signal generation unit 11 balances the light emitted from the light emitting units 2 to 4 to white and controls the light. Signals to the respective light emitting units 2 to 4 are generated so that the signal levels become 70% respectively. The generated signals are converted into analog signals, converted into drive currents by the amplifiers 15 to 17 of the respective colors, and output to the light emitting units 2 to 4, respectively. And each light emission part 2-4 light-emits light according to the input drive current.
[0015]
Next, each of the light receiving units 21 to 23 receives the light that has been dimmed and emitted from each of the light emitting units 2 to 4, and outputs each light signal corresponding to each light to the illumination control device 6. Next, the illumination control device 6 performs dimming so as to be balanced to white at the target dimming rate (70%) in which each light signal is set again as described above. Then, such dimming control is repeated so that the desk is white and dimmed to a predetermined illuminance. Further, when the target dimming rate is changed by the target dimming rate setting device 8, the dimming is performed so that the changed target dimming rate is obtained, and the emission color of the LED lighting device 1 is changed by the color setting device 18. Dimm to the changed color.
[0016]
In this way, each light emitted from each light emitting unit 2 to 4 is individually received by each light receiving unit 21 to 23, and each light signal corresponding to each light is set to a target dimming rate (brightness). Since the light is adjusted so as to have a signal level corresponding to the above, it is possible to effectively use the power of each of the light emitting units 2 to 4 to set the illuminated surface such as a desk to a predetermined illuminance. Moreover, since each light receiving part 21-23 which receives each light light-emitted from each light-emitting part 2-4 was provided, respectively, the light of each color can be received separately, and light control can be performed more accurately. In addition, a predetermined luminance can be obtained, white or other set colors can be reliably reproduced, and light can be emitted without changing the white or other colors even at the end of the lifetime.
[0017]
Embodiment 3 FIG.
FIG. 3 is a block diagram showing the configuration of the third embodiment of the present invention. In the third embodiment, the light receiving units 21 to 23 are omitted from the LED lighting device 1 according to the second embodiment, and the light receiving units 21 to 23 are used in the illumination control device 6 according to the second embodiment. And LEDs of the same color as the LEDs installed in the light emitting units 2 to 4 of the LED lighting device 1 provided in the vicinity of the light receiving units 21 to 23, the monitor red LED 31, the monitor blue LED 32, and the monitor The green LEDs 33 are provided, and the light emitted from the monitor LEDs 31 to 33 is received by the light receiving portions 21 to 23, respectively. The monitoring red LED 31 and the red light receiving unit 21, the monitoring blue LED 32 and the blue light receiving unit 22, and the monitoring green LED 33 and the green light receiving unit 23 may be modularized. In this case, since the light detection accuracy can be increased, the light can be adjusted more accurately.
[0018]
When the LED lighting device 1 and the lighting control device 6 according to the third embodiment configured as described above are used to dimm the desk top to a predetermined illuminance, first, the target dimming rate setting unit 8 performs the target dimming. Set the light rate (70%). Next, each light receiving unit 21 to 23 of the illumination control device 6 individually receives each light emitted from each of the monitor LEDs 31 to 33, and each optical signal corresponding to each received light is an A / D converter. 24 to 26 is converted into a digital signal. Then, the comparators 27 to 29 respectively compare whether the dimming rate corresponding to each signal is the set target dimming rate (70%), and output each difference to the signal generation unit 11. Based on the comparison result (each difference) and the white balance information stored in the storage unit 10, the signal generation unit 11 balances the light emitted from the light emitting units 2 to 4 to white and controls the light. Signals to the light emitting units 2 to 4 are generated so that the signal level is 70%. The generated signals are converted into analog signals, converted into drive currents by the amplifiers 15 to 17 of the respective colors, and output to the light emitting units 2 to 4. At this time, currents proportional to the drive currents converted by the amplifiers 15 to 17 of the respective colors (which may be the same) are also output to the monitor LEDs 31 to 33, respectively. The light emitting units 2 to 4 emit light corresponding to the input drive current, and the monitor LEDs 31 to 33 also emit light corresponding to the input drive current.
[0019]
Next, the respective light receiving units 21 to 23 individually receive the respective lights emitted from the dimmed monitor LEDs 31 to 33, and set the respective light signals corresponding to the respective lights. (70%) and dimming again to balance white. Then, based on the light emitted from each of the monitor LEDs 31 to 33, the light emitted from each of the light emitting units 2 to 4 is repeatedly controlled so that the desk is white and adjusted to a predetermined illuminance. Make it light. Further, when the target dimming rate is changed by the target dimming rate setting device 8, the dimming is performed so that the changed target dimming rate is obtained, and the emission color of the LED lighting device 1 is changed by the color setting device 18. Dimm to the changed color.
[0020]
As described above, the light control units 21 to 23 are provided in the illumination control device 6, and LEDs 31 to 33 having the same characteristics as the LEDs used for the light emitting units 2 to 4 are provided for monitoring in the vicinity thereof. The light emitted from each of the LEDs 31 to 33 is received by the light receiving portions 21 to 23, so that the light of each color can be easily received individually, and the light can be adjusted with higher accuracy. Thus, the illuminated surface such as a desk can be set to a predetermined illuminance, and white or another set color can be reliably reproduced. Further, since the LEDs have low luminance, the light can be received more reliably by providing the monitoring LEDs 31 to 33 in the vicinity of the light receiving portions 21 to 23, and the light receiving accuracy can be improved. Further, the LED lighting device 1 in which the light receiving units 21 to 23 are omitted can reduce the overall structure, and it is not necessary to provide the LED lighting device 1 and the lighting control device 6 close to each other. The LED lighting device 1 and the lighting control device 6 can be installed corresponding to the place.
[0021]
In the first to third embodiments described above, the LED illumination device 1 and the illumination control device 6 are separately configured. However, both the components 1 and 6 may be integrally configured. In this case, the same effect can be obtained, the entire structure can be reduced in size, and the cost can be reduced.
In the above-described first to third embodiments, the case where the colors of the light emitting units 2 to 4 provided in the LED lighting device 1 are red, blue, and green is shown, but other colors may be used. May be one, two, or plural. These cases also have the same effect.
[0022]
【The invention's effect】
As described above, the present invention is an illumination control device that performs dimming control on a light emitting unit composed of a plurality of LED groups, and an optical signal corresponding to light from the light emitting unit has a signal level corresponding to a predetermined illuminance. Since the light-emitting unit is dimmed and controlled as described above, the power of the light-emitting unit can be effectively used to set the illuminated surface such as a desk to a predetermined illuminance. Further, although the power of the light emitting unit is effectively used, the life of the LED of the light emitting unit can be extended because the power can be prevented from being used unnecessarily while maintaining a predetermined illuminance.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a second embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 LED lighting apparatus, 2 Red LED light emission part, 3 Blue LED light emission part, 4 Green LED light emission part, 5 Light receiving part, 6 Illumination control apparatus, 10 Storage part, 21 Red light receiving part, 22 Blue light receiving part, 23 Green light receiving part, 31 Red LED for monitor, 32 Blue LED for monitor, 33 Green LED for monitor.

Claims (4)

A lighting control device that has a plurality of LED groups for each emission color and performs dimming control on each light emitting unit that emits a set color,
A monitor LED for each emission color;
Each light receiving unit that receives light from each of the monitor LEDs,
A signal generation unit that generates a signal to each light emitting unit so that an optical signal corresponding to each light received by each of the light receiving units has a predetermined illuminance and a signal level corresponding to a set color;
Means for outputting each converts the signal by the signal generating unit has generated to the drive current of each light emitting unit to each of said light emitting portion and each said monitoring LED,
An illumination control device comprising:   The illumination control device according to claim 1, wherein the signal generation unit generates a signal to each light emitting unit so that a color balance of each light emission color becomes a signal level corresponding to a predetermined color balance.   A light emitting unit comprising a plurality of LED groups that are dimmed and controlled by the illumination control device according to claim 1, a light emitting unit having a plurality of LED groups for each emission color, or a plurality of LED groups for each emission color. An LED lighting device comprising: each light emitting unit having the following.   4. The LED lighting device according to claim 3, wherein the LED lighting device is integrated with the lighting control device according to claim 1 or 2.

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