JP2012129021A - Lighting system, lighting control method, and lighting control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system which can easily set a target value in color matching.SOLUTION: A lighting system 1 comprises a control IC 521 for controlling a dimming level of a plurality of LED units 6 with different luminous colors; a sensor part 12 for detecting brightness on a radiated surface, on which lights from the LED units 6 are radiated; a memory 512 for storing each sensor voltage value when a light of each LED unit 6 is controlled to a predetermined dimming level; and a microcomputer 511 for setting a target value based on each sensor detection value stored in the memory 512. The control IC 521 controls the dimming level of the LED units 6 so that the sensor detection value when the lights of the plural LED units 6 are controlled is almost identical to the target value.

Description

  The present invention relates to a lighting device, a lighting control method, and a lighting control program.

  Conventionally, many techniques for keeping the illuminance of an illuminated surface of a lighting fixture installed on a ceiling in an office or the like constant are known. As one of them, the following illumination device is known. Specifically, the light source, the illuminance sensor that measures the illuminance of the illuminated surface illuminated by the light source by reflected light, and the light from the light source so that the illuminance of the illuminated surface is constant based on the output value of the illuminance sensor And a control unit for controlling the output, changing the light output each time the power is turned on, and based on the correspondence between the output value of the illuminance sensor without light output and the output value with light output After setting a target value corresponding to a predetermined light output value, the light output is controlled so that the output value of the illuminance sensor becomes the target value (see, for example, Patent Document 1). According to this illuminating device, the target value can be automatically set, and the illuminance of the irradiated surface can be kept constant even when the reflectance of the irradiated surface changes due to a layout change or the like.

JP 2005-243314 A

  Recently, a residential ceiling light that can be dimmed and toned using LEDs (Light Emitting Diodes) of different colors as a main light source has been commercialized. For example, by changing the color mixture ratio of white and bulb color, it is possible to perform toning in multiple stages from white to bulb color. However, since the color mixture ratio varies due to variations in the brightness of the LEDs, a deviation occurs in the color of the mixed light.

  In addition, when the lighting device is equipped with a function that adjusts light according to daylight (automatic light control function), a difference occurs in the detection value of the brightness sensor due to variations in the brightness of the LEDs, or the spectral sensitivity of the brightness sensor. Since the spectral distribution differs depending on the light emission color with respect to the characteristic, even if the brightness is the same, the difference in the light emission color may cause a difference in the detection value (sensor voltage value) of the brightness sensor.

  Conventionally, brightness variation has not been taken into consideration, so if the toning level is changed after setting the target value to keep the illuminance of the illuminated surface of the lighting device constant, the sensor voltage value of the target value will shift. It will occur. Therefore, in the conventional lighting device, when changing the toning level, it is necessary to turn off the power once and then turn it on again. However, when such a conventional lighting device is applied to a ceiling light for a house, every time the toning level is changed, the remote controller or the wall switch must be operated to turn on the power, which is inconvenient. It is. Even if the target value can be set without turning on the power again, the target value must be set every time the toning level is changed, and must be turned off once.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an illumination device, an illumination control method, and an illumination control program in which a target value can be easily set even during toning.

  In order to solve the above-described problems, an illumination device according to the present invention has a light source control unit that controls dimming levels of a plurality of light sources having different emission colors, and brightness on an irradiated surface irradiated with light from the light sources. A sensor unit for detection, a sensor detection value storage unit for storing each sensor detection value detected by the sensor unit when each light source is dimmed to a predetermined dimming level, and the sensor detection value storage unit. A target value setting unit that sets a target value of the sensor detection value when the plurality of light sources are dimmed based on each sensor detection value, and the light source control unit includes the plurality of light sources. The dimming level of the light source is controlled so that the sensor detection value when dimming substantially matches the target value.

  In the present invention, the light source control unit controls the dimming level of the light source so that the sensor detection values when the light sources are dimmed substantially match, and the target value setting unit The coincident sensor detection value is set as the target value.

  Moreover, in this invention, the said target value setting part sets the said target value based on ratio of the sensor detection value of each light source from which the brightness in the said to-be-irradiated surface becomes substantially the same.

  In the present invention, the target value setting unit sets the target value based on the color mixture ratio of each light source.

  Further, the illumination control method of the present invention includes a light source control step for controlling a dimming level of a plurality of light sources having different emission colors, and a detection step for detecting brightness on a surface to be irradiated with light from the light source. The plurality of sensor detection values stored in the sensor detection value storage unit that stores each sensor detection value detected in the detection step when each light source is dimmed to a predetermined dimming level. Setting a target value of the sensor detection value when the light source is dimmed, and in the light source control step, the sensor detection value when the plurality of light sources are dimmed is the target value. The dimming level of the light source is controlled so as to substantially match.

  Moreover, the illumination control program of this invention is a program for making a computer perform each step of the said illumination control method.

  According to the present invention, it is easy to set a target value even during toning.

(A)-(B) The figure for demonstrating an example of the external appearance of the lighting fixture in embodiment of this invention The block diagram which shows the structural example of the lighting fixture in embodiment of this invention The flowchart which shows the operation example of the lighting fixture in embodiment of this invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The lighting device according to the present embodiment is a lighting device that keeps the average illuminance of an irradiated surface such as a floor surface or a desk surface almost constant in a living room of a house, for example, and has a function of adjusting light according to daylight (automatic adjustment). Energy saving is possible by the optical function.

First, the external appearance of the lighting fixture 1 is demonstrated using FIG. 1 (A) and (B).
1A and 1B are diagrams illustrating an example of the appearance of a lighting fixture 1 according to an embodiment of the present invention. FIG. 1A illustrates a state in which the lighting fixture 1 is attached to a ceiling surface 11. FIG. 1B is a view of the luminaire 1 as viewed from below. The lighting fixture 1 is an example of a lighting device.

  As shown in FIGS. 1A and 1B, the lighting fixture 1 is a residential ceiling type lighting fixture and can be operated by an infrared remote controller 3. The luminaire 1 is provided with a fixture fixing portion / power source connection portion 7 for fixing the luminaire 1 and receiving power supply, for example, in the approximate center of a rectangular plate-shaped housing 9. The appliance fixing unit / power supply connection unit 7 is attached to a hook-type wiring component installed on the ceiling surface 11.

  The lighting circuit unit 5 and the LED unit 6 are attached to the housing 9 together with the cover 8 and covered with a resinous diffusion cover 10. The LED unit 6 is an example of a light source, and as shown in FIG. 1B, 8 units are arranged in a square shape. Moreover, although it is an example, one LED unit 6 is comprised by the nine LED elements 6a, and the LED element 6a for white light and the LED element 6a for light bulb color are arrange | positioned alternately.

  A light receiving element M1 is mounted on the substrate of the lighting circuit portion 5 as shown in FIG. 1B, and the cover 8 has a through hole so that a signal (remote control signal) from the remote control 3 can be received. . The sensor unit 12 is attached to the edge of the luminaire 1 as shown in FIG. 1B so that light from the LED unit 6 does not directly enter.

  The remote controller 3 transmits a remote control signal when the operation button 3b of the remote controller 3 is pressed using the infrared LED 3c. The lighting fixture 1 performs a predetermined | prescribed operation | movement, if a remote control signal is received by the light receiving element M1. Predetermined operations include, for example, all lights, dimming, turning on nightlight, raising dimming level, lowering dimming level, turning off, starting automatic dimming function, and brightness of LED unit 6 during dimming This is an operation such as setting a target value for determination.

Next, the structure of the lighting circuit part 5 of the lighting fixture 1 is demonstrated.
FIG. 2 is a block diagram illustrating a configuration example of the lighting circuit unit 5 of the lighting fixture 1 according to the embodiment of the present invention. The lighting circuit unit 5 illustrated in FIG. 2 includes a control unit 510, a power supply unit 520, and a light receiving element M1. The control unit 510 includes a microcomputer 511 and a memory 512. The power supply unit 520 includes a control IC 521, an input filter 522, a rectifier circuit 523, a boost chopper circuit 524, and step-down chopper circuits 525 and 526. Here, the main configuration of the lighting circuit unit 5 will be mainly described.

  The sensor unit 12 shown in FIG. 2 is a brightness sensor such as a photodiode, and detects the brightness on the irradiated surface irradiated with light from the light source. Moreover, the sensor part 12 outputs the electric current according to the incident light quantity. The output current is converted into a voltage by a load resistor (not shown) connected to the output terminal of the sensor unit 12 and input to an analog input terminal (not shown) of a microcomputer (microcomputer) 511 of the control unit 510. .

  The microcomputer 511 performs analog-digital conversion (AD conversion) on the input voltage (AC voltage). Then, the AD converted voltage value (hereinafter also referred to as sensor voltage value) is compared with the target value. This target value is a target value of the sensor output value when the plurality of LED units 6 are dimmed. Then, a dimming signal (here, PWM (Pulse Width Modulation) signal) is output to the control IC 521 of the power supply unit 520 in order to adjust the output of the LED unit 6 as a light source so that the two substantially coincide. That is, the control IC 521 controls the dimming level of the LED unit 6 so that the sensor voltage value and the target value when the plurality of LED units are dimmed substantially coincide with each other. These processes are performed by a program of the microcomputer, and the lighting circuit unit 5 operates so that the brightness on the irradiated surface becomes substantially constant.

  The power supply unit 520 is connected to an external commercial power supply (not shown). Specifically, a step-up chopper circuit 524 is connected to an external commercial power source via an input filter 522 and a rectifier circuit 523. The step-down chopper circuits 525 and 526 are connected to the output terminal of the step-up chopper circuit 524 in parallel for each emission color (white light, light bulb color light). An LED unit 61 that emits white light is connected to the output terminal of the step-down chopper circuit 525, and an LED unit 62 that emits light bulb color light is connected to the output terminal of the step-down chopper circuit 526. A plurality of LED elements 6a (see FIG. 1) are mounted on the substrate of one LED unit 6 (61, 62). Further, as shown in FIG. 2, a plurality of LED units 61 and 62 are connected in series or in parallel.

  The control IC 521 performs feedback control for controlling the output voltage of the step-down chopper circuits 525 and 526 so that the current flowing through the LED unit 6 becomes substantially constant. At this time, the control IC 521 adjusts the output of the step-down chopper circuit 525 by changing the target value of the current of the LED unit 6 according to the dimming signal from the microcomputer 511. The light control level is adjusted by this output adjustment. As described above, the control IC 521 controls the dimming level of the plurality of LED units 6 having different emission colors.

Next, target value setting will be described.
FIG. 3 is a diagram illustrating a flowchart illustrating an operation example of the lighting fixture 1 of the present embodiment.

  When the target value setting button of the external remote controller 3 (see FIG. 1) is pressed, the light receiving element M1 of the luminaire 1 receives a target value setting instruction signal for setting the target value from the remote controller 3 (step S101). ). Thereby, the target value setting process is started.

  Subsequently, the control IC 521 turns on only white light (hereinafter also referred to as white light) by the LED unit 61 at, for example, a dimming level of 100% (step S102). The microcomputer 511 causes the sensor unit 12 to measure the brightness of the irradiated surface at this time, and stores the sensor voltage value in the memory 512 (step S103).

  Subsequently, similarly to the white light, the control IC 521 turns on the light of only the light bulb color (hereinafter also referred to as light bulb color light) by the LED unit 6B, for example, at a dimming level of 100% (step S104). The microcomputer 511 causes the sensor unit 12 to measure the brightness of the irradiated surface at this time, and stores the sensor voltage value in the memory 512 (step S105).

  That is, the memory 512 stores each sensor voltage value when each LED unit 6 is dimmed to a predetermined dimming level.

  Subsequently, the microcomputer 511 compares the sensor voltage value of white light and the sensor voltage value of light bulb color light stored in the memory 512. In other words, the microcomputer 511 determines whether or not the sensor voltage value of white light and the sensor voltage value of light bulb color light are substantially the same (for example, the difference between the two is within ± 5% of the sensor voltage value) (step S106). .

  If the sensor voltage value of the white light and the sensor voltage value of the light bulb color light are not substantially the same, the microcomputer 511 determines whether or not the sensor voltage value of the white light is larger than the sensor voltage value of the light bulb color light (step S107). When the sensor voltage value of the white light is larger, the control IC 521 turns on the white light with a dimming level of 100% (Step S108). On the other hand, when the sensor voltage value of the light bulb color light is larger, the control IC 521 turns on the light bulb color light at a dimming level of 100% (step S109).

  Subsequently, the control IC 521 decreases the dimming level (duty of the dimming signal) of the light emission color having the larger sensor voltage value by one step (step S110). That is, the control IC 21 performs control so as to lower the dimming level of the light emission color having the higher sensor voltage value (that is, brighter) so that the two sensor voltage values are substantially the same. The light control level reduced by one step is stored in the memory 512. The microcomputer 511 again compares the sensor voltage value of the white light stored in the memory 512 with the sensor voltage value of the light bulb color light. That is, the microcomputer 511 determines again whether or not the sensor voltage value of white light and the sensor voltage value of light bulb color light are substantially the same (step S111).

  On the other hand, if the sensor voltage value of white light and the sensor voltage value of the light bulb color light are substantially the same in step S106 or S111, the microcomputer 511 uses the two sensor voltage values and the dimming level at this time for each reference. The value is stored in the memory 512 (step S112). Here, the reference value of the sensor voltage value corresponds to the target value. The light control level reference value is the light output level at which the sensor voltage value is substantially the same for the light of the color with the light control level lowered (that is, the light with the higher initial sensor voltage value). The value is set so that the dimming level does not increase any more.

  Thus, the microcomputer 511 sets a target value based on each sensor voltage value stored in the memory 512. For example, the control IC 521 controls the dimming level of the LED unit 6 so that the sensor voltage values substantially match, and the microcomputer 511 sets the sensor detection value when the values substantially match as the target value.

  Here, it is necessary to consider that the sensor voltage value differs depending on the emission color even if the brightness of the irradiated surface is the same. Therefore, a sensor voltage value at which the brightness of the irradiated surface (illuminance such as direct illuminance and average illuminance) is approximately the same is measured in advance for each of white light and light bulb color light. The microcomputer 511 sets and stores the target value (mainly steps S106 to S112) based on the ratio of the sensor voltage values.

  As described above, the microcomputer 511 may set the target value based on the ratio of the sensor detection values of the LED units 6 that have substantially the same brightness on the irradiated surface. Further, the sensor detection value stored in the memory 512 may be corrected based on the ratio of the sensor detection values.

  For example, when the ratio of the sensor voltage values at substantially the same brightness is the sensor voltage value of the light bulb color light: the sensor voltage value of the white light = 1: A (Equation 1), the sensor voltage value of the white light is set to 1. After multiplying by / A, the sensor voltage value of the light bulb color light and the sensor voltage value of white light in step S106 may be compared. The sensor voltage value and the dimming level of the LED unit 6 (corresponding to the brightness of the irradiated surface) are in a proportional relationship. Therefore, when toning, the upper limit value of the dimming level of the LED unit 6 is set to 100%, an appropriate dimming level corresponding to the color mixture ratio is obtained by calculation, and an appropriate target value is also obtained by calculation. be able to.

  For example, when the dimming level of the LED unit 6 is 100%, the duty of the dimming signal is 100% (the dimming level and the duty are in a proportional relationship), the sensor voltage value of the light bulb color light: 2.0 V, and the white light sensor A case where the voltage value is 2.6 V and A = 1.1 in the above (Equation 1) will be described.

The ratio of the brightness of the irradiated surface is as follows.
Light bulb color light: white light = 2.0: 2.6 / 1.1 = 2.0: 2.36 = 1: 1.18
That is, in order to make the brightness of the illuminated surface substantially the same, the dimming level of white light may be lowered to 85%. The sensor voltage value at this time is bulb color light: white light = 2.0: 2.01.

Here, when the color mixture ratio is light bulb color light: white light = 3: 7, the duty of the dimming signal may be set as follows.
Light bulb color light: white light = 100 × 0.3: 85 × 0.7 = 30: 59.5

  Furthermore, the target value is 2.0 × 0.3 + 2.01 × 0.7 = 2 because the sensor voltage value of the light bulb color light: the sensor voltage value of the white light = 2.0: 2.01. .01 (V). Such calculation processing is performed by the microcomputer 11. As described above, the target value may be set based on the color mixture ratio of each LED unit 6. At this time, calculation is performed according to a data table indicating the relationship between the duty and the light control level.

  It should be noted that the target value may be set at a predetermined color mixture ratio first, then changed to an arbitrary color mixture ratio by operating the remote controller 3, and the target value once set may be reset.

  According to such setting of the target value, it is not necessary to set the target value by turning off the power supply every time the toning level is changed. In addition, since an appropriate target value can be set, it is possible to improve variations in brightness emitted by each LED unit 6. Furthermore, since the brightness varies individually for each emission color, the color mixture ratio has shifted, but in this embodiment, a target value can be set in consideration of the color mixture ratio. Note that if the brightness variation can be suppressed by another means, the flow of comparing the sensor voltage values so as to be substantially the same may be omitted.

  Note that the communication means of the remote controller 3 may be weak wireless, specific low power wireless, etc., instead of infrared. In addition, the configuration of the LED unit 6 and the lighting circuit unit 5, the instrument structure, the arrangement, the shape, and the like are not limited. For example, the light emitting element may be an organic EL instead of the LED element 6a.

1 Lighting equipment 3 Remote control 3b Operation button 3c Infrared LED
5 lighting circuit unit 510 control unit 511 microcomputer 512 memory 520 power supply unit 521 control IC
522 Input filter 523 Rectifier circuit 524 Step-up chopper circuit 525, 526 Step-down chopper circuit 6 LED unit 6a LED element 61 LED unit (white light)
62 LED unit (bulb color light)
7 Device Fixing / Power Supply Connection Unit 8 Cover 9 Case 10 Diffusion Cover 11 Ceiling Surface 12 Sensor Unit M1 Light Receiving Element

Claims (6)

A light source control unit that controls dimming levels of a plurality of light sources having different emission colors;
A sensor unit for detecting brightness on an irradiated surface irradiated with light from the light source;
A sensor detection value storage unit for storing each sensor detection value detected by the sensor unit when each light source is dimmed to a predetermined dimming level;
A target value setting unit that sets a target value of the sensor detection value when the plurality of light sources are dimmed based on each sensor detection value stored by the sensor detection value storage unit;
With
The light source control unit is a lighting device that controls a light control level of the light source so that the sensor detection value when the light sources are light-controlled substantially matches the target value. The lighting device according to claim 1,
The light source control unit controls the dimming level of the light source so that the sensor detection values when the light sources are dimmed substantially match,
The target value setting unit is an illumination device that sets the substantially coincident sensor detection value as the target value. The lighting device according to claim 1 or 2,
The target value setting unit is an illuminating device that sets the target value based on a ratio of sensor detection values of each light source having substantially the same brightness on the irradiated surface. The illumination device according to any one of claims 1 to 3,
The target value setting unit is an illumination device that sets the target value based on a color mixture ratio of each light source. A light source control step for controlling dimming levels of a plurality of light sources having different emission colors;
A detection step of detecting brightness on an irradiated surface irradiated with light from the light source;
The plurality of light sources based on each sensor detection value stored by a sensor detection value storage unit that stores each sensor detection value detected in the detection step when each light source is dimmed to a predetermined dimming level Setting a target value of the sensor detection value when the light is dimmed;
Have
In the light source control step, an illumination control method of controlling a dimming level of the light source so that the sensor detection value when the plurality of light sources are dimmed substantially matches the target value.   The lighting control program for making a computer perform each step of the lighting control method of Claim 5.

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