JP3633196B2 - Dimming control method for lighting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dimming control method for an illuminating lamp that uses natural light efficiently to perform optimal dimming control of the illuminating lamp to save energy.
[0002]
[Prior art]
FIG. 8 is a schematic configuration diagram for explaining an illumination device disclosed in Japanese Patent Application Laid-Open No. 59-5597. In FIG. 8, the illuminating device includes an optical sensor 5, an illuminating lamp 8, and a control circuit unit 9.
[0003]
Next, the operation of the lighting device will be described with reference to FIG. The optical sensor 5 which is one component of the lighting device detects natural light from the outside reflected by the floor and artificial light from the illumination lamp 8. Then, the dimming control is performed by the control circuit unit 9 so that the dimming degree of the illuminating lamp 8 is lowered as the amount of natural light increases. Thus, the room can be maintained at a predetermined brightness (illuminance) while using natural light.
[0004]
[Problems to be solved by the invention]
Since the conventional lighting device is configured to incorporate the light sensor into the lighting device, the amount of light received by the light sensor varies greatly depending on the color of the floor surface or the distance between the photodetector and the floor. For example, when the floor surface is white, the amount of light reflected from the floor is large, so the amount of light received by the optical sensor is large. Further, when the floor surface is black, the amount of light received from the optical sensor is small because the amount of light reflected from the floor is small. For this reason, since the artificial light quantity from the illumination lamp fluctuates, the brightness of the room cannot be kept constant while using natural light. Therefore, when the lighting device is installed in the room, it is necessary to manually adjust the brightness in consideration of the environmental condition. For example, in the case of a lighting device hanging from the ceiling, it is necessary to select the daylight hours when the daylight intensity is maximum and adjust the brightness of the control circuit unit built into the lighting device using a stepladder etc. is there. However, the brightness adjustment of the lighting device has a problem that it takes a lot of labor and time as described above.
[0005]
In addition, the conventional lighting device has a problem that when the natural light amount changes from large to small, it is impossible to perform precise dimming control of the illumination lamp depending on the detection accuracy or detection method of the optical sensor.
[0006]
In addition, when a person crosses directly under the lighting device or when the person stops, the amount of light received by the light sensor varies, so the dimming level of the lighting lamp changes, resulting in unstable brightness, and a very strange feeling. There was a problem of generating.
[0007]
Further, as shown in FIG. 9, the optical sensor is disposed on a place close to the side where a human is present, that is, on a floor surface or on a desk. When the illumination lamp is dimmed according to the output of the optical sensor, the brightness of the illumination lamp can be maintained as specified without depending on the color of the floor surface. However, since the output of the optical sensor is sent out by wire or wirelessly, there are problems that the wiring work is complicated and the circuit cost is increased.
[0008]
The present invention was made to solve such problems, so that the brightness of the illuminating lamp does not change depending on the color of the floor surface of the room or the distance between the light sensor incorporated in the lighting device and the floor. An object of the present invention is to provide a dimming control method for an illuminating lamp capable of automatically adjusting brightness.
[0009]
Another object of the present invention is to provide a lighting control method for lighting that enables precise lighting control of the lighting even when the natural light quantity from the outside changes little by devising a brightness detection method using a light sensor. It is said.
[0010]
In addition, even when a person crosses the lighting device or when the person stops, the dimming degree of the illuminating lamp can maintain a stable brightness without changing the dimming degree of the illuminating lamp. The purpose is to provide.
[0011]
[Means for Solving the Problems]
A dimming control method according to the present invention includes:In a dimming control method for controlling the dimming of an illuminating lamp by detecting illuminance including artificial light and natural light from the illuminating lamp with a photodetector, the supply input to the illuminating lamp is set to a first predetermined value at the start of lighting A first step of reducing the supply input to the illuminating lamp by a second predetermined value, a second step of detecting the illuminance before and after the decrease by the photodetector, and the illuminance detected in the second step A third step of increasing the supply input to the illuminating lamp by a third predetermined value when the rate of change is equal to or greater than a predetermined threshold, and repeating the second step and the third step to generate a natural light quantity The supply input to the illuminating lamp is reduced in accordance with the size of the lamp.
Further, the first predetermined value is a value for lighting the illumination lamp at the maximum output.
The rate of change is a calculated value obtained by dividing the difference in illuminance before and after the decrease detected by the photodetector in the second step by the illuminance before the decrease.It is what I did.
[0012]
Also,The third predetermined amount is changed to the second predetermined amount.A larger value is set.
[0013]
Also,In the second step, the difference between the reduced illuminance detected by the photodetector and the reduced illuminance detected by the optical detector in the previous second step is compared with a predetermined second threshold. When the output difference is less than the second threshold value, the process proceeds to the third process, whereas when the output difference is equal to or greater than the second threshold value, the process returns to the first process.It is what I did.
[0014]
Also,Illuminance including artificial light and natural light from the illuminating lamp is detected by a plurality of photodetectors, and when the output difference between the plurality of photodetectors becomes less than a predetermined third threshold, based on the outputs of these photodetectors In the dimming control method for calculating the average illuminance and controlling the dimming of the illuminating lamp, the first step of setting the supply input to the illuminating lamp to the first predetermined value at the start of lighting, and the supplying to the illuminating lamp The second step of reducing the input by a second predetermined value and calculating the average illuminance before and after the decrease based on the outputs of the plurality of photodetectors, and the change rate of the average illuminance calculated in the second step is predetermined. A third step of increasing the supply input to the illuminating lamp by a third predetermined value when the first threshold value is greater than or equal to the first threshold value, and repeating the second step and the third step According to the size, the supply input to the illuminating lamp is reduced.
Further, the first predetermined value is a value for lighting the illumination lamp at the maximum output.
The rate of change is a calculated value obtained by dividing the difference in average illuminance before and after the decrease calculated based on the outputs of the plurality of photodetectors in the second step by the average illuminance before the decrease.
Furthermore, in the second step, the average illuminance after reduction calculated based on the outputs of the plurality of photodetectors, and after the reduction calculated based on the outputs of the plurality of photodetectors in the previous second step. The difference from the average illuminance is compared with a predetermined second threshold value. When the difference is less than the second threshold value, the process proceeds to the third step. Return to step 1It is what I did.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating an embodiment of a dimming control method for an illuminating lamp according to the present invention. In FIG. 1, 2 is a rectifying / smoothing circuit for converting the commercial power source 1 into a DC voltage, 3 is a converter for boosting the DC voltage converted by the rectifying / smoothing circuit 2 to 400 V, and 4 is based on the output of the optical sensor 5. A dimming control circuit that determines the dimming frequency, 6 is an inverter that is driven and controlled by the dimming control circuit 4, and 8 is an illuminating lamp that lights a high-frequency voltage from the inverter 6 through a coil 7. The mechanism is designed so that the optical sensor 5 is provided in the vicinity of the illumination lamp 8. With such a configuration, if the frequency of the high-frequency power output from the inverter 4 increases, the impedance of the coil 6 increases, and the current flowing through the discharge lamp 5 is limited. Thereby, the brightness of the lighting device is adjusted. For example, when the target dimming degree is 100% (maximum output), the frequency of the high frequency power is 50 kHz, and when the target dimming degree is 40% (brightness of 40% of the maximum output), the frequency of the high frequency power is 80 kHz.
[0016]
Moreover, the operation | movement of the dimming control of an illumination lamp is demonstrated using the flowchart shown in FIG. In FIG. 2, when the lighting switch is turned on (step S0), the illumination lamp 8 is lit at the maximum output (step S10). Then, the illuminance of the artificial light and natural light of the illuminating lamp 8 is detected by the optical sensor 5, and the output A1 of the optical sensor 5 corresponding to the detected amount is read (step S20). Thereafter, the supply input to the illuminating lamp 8 is decreased by a predetermined amount (step S30), the illuminance of artificial light and natural light from the illuminating lamp 8 is detected by the optical sensor 5, and the output of the optical sensor 5 according to the detected amount A2 is read (step S40). Next, from the output A1 and output A2 of the optical sensor 5,Output change (A1-A2) divided by output A1The output change rate α is calculated (step S50). And the magnitude | size with the threshold value C1 which discriminate | determines whether the output change rate (alpha) of the optical sensor 5 and the illumination intensity of a room is a lower limit of an appropriate area | region is compared (step S60). If α ≧ C1 is not satisfied, it is determined as NO, that is, it is determined that natural light dominates the brightness of the room, and the output A1 of the light sensor 5 is read again (step S20). The supply input to 8 is decreased by a predetermined amount (step S30). Thereafter, the same operation flow as described above is repeated.
[0017]
Further, the output change rate α of the optical sensor 5 is compared with the threshold value C1 (step S60), and if α ≧ C1 is satisfied, it is determined YES, that is, the brightness of the room is determined as the illumination lamp 8 And the supply input to the illumination lamp 8 is increased by a predetermined amount (step S70). Here, the magnitudes of the decrease and increase of the supply input to the illumination lamp 8 are made equal. Then, after reading the output A1 of the light sensor 5 again (step S20), the supply input to the illumination lamp 8 is decreased by a predetermined amount (step S30). Thereafter, the same operation as described above is repeated. When the supply input to the illumination lamp 8 is reduced or increased, the input is changed to such an extent that the human eye does not feel flicker. A control program of such an operation flowchart is set in the dimming control circuit 4 in advance. The same applies to the second embodiment.
[0018]
Further, the operation of the dimming control of the illuminating lamp 8 will be described with reference to the timing chart shown in FIG. In FIG. 3, when the natural light amount is large, that is, when natural light is dominant, the supply input to the illuminating lamp 8 on the vertical axis gradually decreases with the elapsed time on the horizontal axis. Then, immediately after reaching the first reference level, the supply input increases by a predetermined amount, and immediately after reaching the second reference level, the supply input decreases again by a predetermined amount (A line in FIG. 3). Such a series of operations is continuously repeated. Here, the first reference level is a value of supply input to the illuminating lamp 8 when the illuminance of the room reaches the lower limit value of the appropriate region. The second reference level is a value of supply input to the illuminating lamp 8 when the room illuminance reaches the upper limit value of the appropriate region. The same applies to the second and third embodiments.
[0019]
Since such a dimming control method for the illuminating lamp 8 is provided, for example, when the natural light amount is large, that is, when the natural light is dominant, the supply input to the illuminating lamp 8 is reduced to a predetermined level so that the brightness of the entire room is increased. Can be maintained properly. Therefore, it is possible to reduce the supply input to the illuminating lamp 8 that does not contribute much to the brightness of the room, and it is possible to provide a dimming control method for the illuminating lamp that achieves an energy saving effect that the electricity bill can be saved.
[0020]
Embodiment 2. FIG.
FIG. 4 is a timing chart for explaining another embodiment of the illumination lamp dimming control method according to the present invention. The configuration diagram and the operation flowchart are the same as those in the first embodiment, and thus the description thereof is omitted here. In FIG. 4, in a region where the natural light amount is large (region (1) in FIG. 4), the ratio that natural light dominates the brightness of the room is large, so that the illumination lamp 8 can be dimmed deeply. Further, in a region where the natural light amount is medium or small (region (2) in FIG. 4), since the proportion of natural light that dominates the brightness of the room is small, the illumination lamp 8 is dimmed shallowly. In FIG. 4, in the region where the natural light quantity is large, the supply input to the illuminating lamp 8 on the vertical axis gradually decreases with the elapsed time on the horizontal axis, and immediately after reaching the first reference level, Supply input increases by a predetermined amount. Then, immediately after reaching the second reference level, the supply input decreases again by a predetermined amount (A line in FIG. 4). Here, the relationship between the decrease amount and the increase amount of the supply input to the illuminating lamp 8 is set as decrease amount <increase amount. Such a series of operations is continuously repeated.
[0021]
Also, in FIG. 4, when the natural light amount changes from a large region to a middle region, the output change rate α of the photodetector 5 increases (the calculation operation in step S50 on the flowchart shown in FIG. 2). Then, the supply input to the illuminating lamp 8 proceeds in the upward direction while sequentially repeating increase and decrease (repetitive operation of step S30 and step S70 on the flowchart shown in FIG. 2). Then, after the supply input to the illuminating lamp 8 passes through the first 'reference level, the direction is changed from the increasing direction to the decreasing direction. Next, immediately after the supply input reaches the first 'reference level, it increases again and moves toward the second' reference level. Then, immediately after the supply input reaches the second 'reference level, it decreases again. In this way, the supply input to the illuminating lamp 8 advances in the region between the first 'reference level and the second' reference level while repeating decreasing and increasing sequentially (B line in FIG. 4). The first reference level has the same definition as the first reference level. The second reference level has the same definition as the second reference level. The same applies to the third embodiment.
[0022]
Further, in FIG. 4, when the natural light amount changes from a large region to a small region, the output change rate α of the optical sensor 5 further increases (calculation operation in step S50 on the flowchart shown in FIG. 2). Then, the supply input to the illuminating lamp 8 proceeds further in the upward direction while sequentially repeating the increase and decrease (repetitive operation of step S30 and step S70 on the flowchart shown in FIG. 2). Then, after the supply input to the illuminating lamp 8 passes through the first ″ reference level, the direction is changed from the increasing direction to the decreasing direction. Next, immediately after the supply input reaches the first "" reference level, it increases again to the second "" reference level. Then, immediately after the supply input reaches the second "reference level, it decreases again. In this way, the supply input to the illuminating lamp 8 proceeds in the region between the first ″ reference level and the second ″ reference level while sequentially repeating the decrease and increase (the C line in FIG. 4). ). The first ″ reference level has the same definition as the first reference level. The second ″ reference level has the same definition as the second reference level. The same applies to the third embodiment.
[0023]
Since such a dimming control method for the illuminating lamp 8 is provided, for example, when the natural light amount is large, that is, when the natural light is dominant, the supply input to the illuminating lamp 8 is reduced to a predetermined level so that the brightness of the entire room is increased. The thickness can be maintained moderately. Further, even when the natural light quantity changes from a large area to a middle area or from a large area to a small area, or even when the natural light quantity changes greatly, the supply input to the illuminating lamp 8 is gradually increased to The dimming degree can be controlled as prescribed. For this reason, even if the natural light quantity from the outside changes, the brightness of the entire room can always be maintained appropriately. Further, it is possible to reduce the supply input to the illuminating lamp 8 that does not contribute much to the brightness of the room, and it is possible to sufficiently expect the energy saving effect that the electricity bill can be saved.
[0024]
Embodiment 3 FIG.
FIG. 5 is an operation flowchart for explaining still another embodiment of the dimming control method for an illuminating lamp according to the present invention. The configuration diagram is the same as in the first embodiment. In FIG. 5, the operation contents in the flowcharts S0 to S30, S40, and S50 to S70 are the same as those in the first embodiment, and therefore the operations of the other flowcharts will be described in detail here. The supply input to the illuminating lamp 8 is decreased by a predetermined amount (step S30), and the output A2 of the optical sensor 5 read last time, that is, the output A2 of the optical sensor 5 after the previous decrease is written as A2OLD (step S30). Step S31). Then, the current output A2 of the optical sensor 5 is read (step S40), and then a threshold value for determining whether the output difference γ between the output A2OLD and the output A2 of the optical sensor 5 and the illuminance of the room have rapidly decreased. The size of C2 is compared (step S42). If γ ≧ C2 is not satisfied, it is determined as NO, and it is determined that the temperature of the room has not dropped rapidly.Output change (A1-A2) divided by output A1Output change rate αCalculation(Step S50). The contents of the subsequent operation flow (step S60 and subsequent steps) are the same as those in the first embodiment, and a description thereof will be omitted.
[0025]
Further, the magnitude of the output difference γ of the optical sensor 5 and the threshold value C2 are compared (step S42), and if γ ≧ C2 is satisfied, it is determined as YES, and it is determined that the illuminance of the room has rapidly decreased. Therefore, the illuminating lamp 8 is turned on at the maximum output (step S10). Then, it is executed after including the operation flow described in the first embodiment (after step S10), and the illuminance of the room is adjusted to be within the appropriate region while controlling the supply input to the illumination lamp 8. A control program of the operation flowchart is set in the dimming control circuit 4 in advance.
[0026]
The operation of the dimming control of the illuminating lamp 8 will be described with reference to the timing chart shown in FIG. In the region where the natural light quantity is large, the supply input to the illuminating lamp 8 on the vertical axis gradually decreases with the elapsed time on the horizontal axis, and the supply input increases by a predetermined amount immediately after reaching the first reference level. . Then, immediately after reaching the second reference level, the supply input decreases again by a predetermined amount (A line in FIG. 6). Here, the magnitudes of the decrease and increase of the supply input to the illumination lamp 8 are made equal. Such a series of operations is sequentially repeated.
[0027]
In FIG. 6, when the natural light amount changes from a large region to a middle region, the output difference γ (A2OLD−A2) of the optical sensor 5 is compared with the threshold value C2, and the output difference γ ≧ threshold value. Since it becomes C2, the supply input to the illumination lamp 8 increases rapidly to the maximum output. The supply input gradually decreases immediately after reaching the third reference level, that is, the maximum output value, and increases immediately after reaching the first 'reference level. The supply input then decreases again immediately after reaching the second 'reference level. In this manner, the region between the first 'reference level and the second' reference level advances while the supply input decreases and increases sequentially (B line in FIG. 6).
[0028]
In FIG. 6, when the natural light amount changes from a large region to a small region, the output difference γ (A2OLD−A2) of the optical sensor 5 is compared with the threshold value C2 in the same manner as described above. Since ≧ threshold value C2, the supply input to the illuminating lamp 8 increases rapidly to the maximum output. Then, the supply input gradually decreases immediately after reaching the third reference level, and increases immediately after reaching the first ″ reference level. The supply input then decreases again immediately after reaching the second ″ reference level. Thus, the region between the first ″ reference level and the second ″ reference level advances while the supply input decreases and increases sequentially (C line in FIG. 6).
[0029]
With such a dimming control method, for example, when the amount of natural light is large, that is, when natural light is dominant, the supply input to the illuminating lamp 8 is reduced to a predetermined level, and the brightness of the entire room is moderately adjusted. Can be maintained. Further, even when the natural light amount changes from a large area to a middle area or from a large area to a small area, or even when it changes greatly, the supply input to the illuminating lamp 8 is quickly set to the maximum and turned on ( The dimming degree can be controlled to 100%) and then to a predetermined supply input. As a result, the illuminance of the room can be quickly transferred to an appropriate area even if the natural light quantity is reduced, so that there is no sense of incongruity that it becomes dark to human eyes. Further, it is possible to reduce the supply input to the illuminating lamp 8 that does not contribute much to the brightness of the room, and it is possible to sufficiently expect the energy saving effect that the electricity bill can be saved.
[0030]
Embodiment 4 FIG.
FIG. 7 is an operation flowchart for explaining still another embodiment of the illumination lamp dimming control method according to the present invention. The configuration diagram is the same as in the first embodiment, and here, at least two optical sensors 5 provided in the vicinity of the illumination lamp 8 are used. In FIG. 7, the operations in the flowcharts S0 and S10 are the same as those in the first embodiment, and the subsequent operation flowchart will be described. The first light sensor 5a detects the illuminance of artificial light and natural light from the illuminating lamp 8, and reads the output A1 of the first light sensor 5a (step S20). Next, the illuminance of artificial light and natural light from the illumination lamp 8 is detected by the second photosensor 5b provided at a predetermined interval with respect to the first photosensor 5a, and the output of the second photosensor 5b. B1 is read (step S21). Then, the difference amount between the output A1 of the first photosensor 5a and the output B1 of the second photosensor 5b, that is, the absolute amount | β1 | is calculated (step S22). Next, the magnitude of the absolute amount | β1 | is compared with the threshold value C3 for determining whether, for example, a human is present under the illumination lamp 8 (step S23). If a person is present under the illuminating lamp 8, artificial light and part of natural light from the illuminating lamp 8 irradiate the human head or clothes, causing light absorption and reflection. As a result, the amount of light received by the first optical sensor 5a or the second optical sensor 5b changes. At this time, a difference occurs between the outputs of the first optical sensor 5a and the second optical sensor 5b, so that | β1 | ≧ C3 is satisfied. Then, it is determined as YES, and the illuminance of the artificial light and natural light from the illumination lamp 8 is detected again by the first optical sensor 5a and the second optical sensor 5b. Then, the output A1 of the first photosensor 5a is read (step S20), and then the output B1 of the second photosensor 5b is read (step S21). The subsequent operation is the same as described above.
[0031]
Also, the magnitude of the absolute amount | β1 | is compared with the threshold value C3 (step S23). If | β1 | ≧ C3 is not satisfied, that is, if there is no person below the illumination lamp 8, NO is determined. Then, the output average value L1 is calculated from the output A1 of the optical sensor 5a and the output B1 of the optical sensor 5b (step S24). Then, the supply input to the illuminating lamp 8 is decreased by a predetermined amount (step S30), and the illuminance of artificial light and natural light from the illuminating lamp 8 is detected by the first optical sensor 5a and the second optical sensor 5b. Next, the output A2 of the first photosensor 5a is read (step S40), and the output B2 of the second photosensor 5b is read (step S41). Thereafter, a difference amount between the output A2 of the first photosensor 5a and the output B2 of the second photosensor 5b, that is, an absolute amount | β2 | is calculated (step S42). Then, the magnitude of the absolute amount | β2 | is compared with the threshold value C3 (step S43). If | β2 | ≧ C3 is satisfied, it is determined as YES, and the first photosensor 5a and the second optical sensor 5a are compared. Illuminance of artificial light and natural light from the illuminating lamp 8 is detected by the optical sensor 5b. Next, the output A2 of the first photosensor 5a is read (step S40), and then the output B2 of the second photosensor 5b is read (step S41). The subsequent operation is the same as described above.
[0032]
Also, the magnitude of the absolute amount | β2 | is compared with the threshold value C3 (step S43). If | β2 | ≧ C3 is not satisfied, it is determined as NO, and the first light level after the first dimming read last time is determined. The average output value L2 of the optical sensor 5a and the second optical sensor 5b is written as L2OLD (step S44). Next, the output average value L2 is calculated from the output A2 of the first photosensor 5a and the output B2 of the second photosensor 5b read this time (step SS45). Then, the output difference γ is calculated from the previous output average value L2OLD and the current output average value L2 (step S46). Next, the magnitude of the output difference γ and the threshold value C2 are compared (step S47). When γ ≧ C2 is satisfied, it is determined as YES and the supply input to the illuminating lamp 8 is set to the maximum to light up. (Step S10). The subsequent operation is the same as described above. The definition of the threshold value C2 is the same as that in the third embodiment.
[0033]
If γ ≧ C2 is not satisfied, NO is determined, and the above-mentioned output average value L1 and output average value L2 are determined.Output average value change (L1-L2) divided by output average value L1The output change rate α is calculated (step S50). The subsequent operations are the same as those in Embodiments 1 to 3 in the flow (steps S60 to S70), and thus the description thereof is omitted here. In addition, the magnitude | size of the reduction | decrease amount and increase amount of the supply input to the illuminating lamp 8 is made equivalent. The dimming control circuit 4 is set in advance with a control program of such an operation flowchart.
[0034]
Further, the timing chart showing the operation of the dimming control of the illuminating lamp 8 is the same as that in the third embodiment, and thus the description thereof is omitted here.
[0035]
With such a dimming control method, for example, when the amount of natural light is large, that is, when natural light is dominant, the supply input to the illuminating lamp 8 is reduced to a predetermined level, and the brightness of the entire room is moderately adjusted. Can be maintained. Therefore, it is possible to reduce the supply input to the illuminating lamp 8 that does not contribute much to the brightness of the room, and it is possible to sufficiently expect the energy saving effect that the electricity bill can be saved.
[0036]
When the natural light quantity decreases from the large area to the middle area or from the large area to the small area, the supply input to the illuminating lamp 8 is quickly set to the maximum and the illuminating lamp 8 is turned on (the dimming degree is 100%). ), And then can be controlled to be a predetermined supply input. As a result, even if the natural light quantity rapidly decreases, the illuminance of the room can be quickly transferred to the appropriate region, so that the uncomfortable feeling of darkening with respect to human eyes is eliminated.
[0037]
Further, even when a person crosses the lower side of the illuminating lamp 8 or a person stops below the illuminating lamp 8, the output difference between the first optical sensor 5a and the second optical sensor 5b is calculated. Therefore, the supply input to the illuminating lamp 5 does not change, that is, the dimming degree of the illuminating lamp 8 does not change. Thereby, the brightness of the whole room can always be maintained moderately and stably.
[0038]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0039]
According to the dimming control method for an illuminating lamp according to the present invention, the illuminance of artificial light and natural light from the illuminating lamp is detected by a photodetector, and the supply input to the illuminating lamp is set to a predetermined value at the start of lighting. When the output change rate of the photodetector has increased with the operation of the process and reached a certain threshold value, the supply input is increased by a predetermined amount, and then the operation of decreasing the predetermined amount is repeated. Therefore, for example, when the amount of natural light is large, that is, when natural light is dominant, the supply input to the illuminating lamp can be reduced to a predetermined level, and the brightness of the entire room can be maintained moderately. Therefore, it is possible to reduce the supply input to the illuminating lamp that does not contribute much to the brightness of the room, and it is possible to obtain a dimming control method for the illuminating lamp that achieves an energy saving effect that can save electricity costs.
[0040]
Also, since the increase amount is set to be larger than the decrease amount, the relationship between the increase amount and the decrease amount of the supply input is set. The dimming degree of the illuminating lamp can be controlled as it is gradually increased. For this reason, even if the natural light quantity from the outside changes, the brightness of the entire room can always be maintained appropriately. In addition, it is possible to reduce the supply input to the illuminating lamp that does not contribute much to the brightness of the room, and it is possible to obtain a dimming control method for the illuminating lamp that achieves an energy saving effect that the electricity bill can be saved.
[0041]
Further, in the process of repeating the operation of increasing the supply input by a predetermined amount and then decreasing the predetermined amount, when the illuminance of natural light decreases, the supply input is instantaneously increased to a predetermined value and then decreased. When the output change rate of the photodetector reaches a certain threshold value, the operation of increasing the supply input by a predetermined amount and then decreasing the predetermined amount is repeated, so that the natural light quantity is small or large Even if it falls, the illuminance of the room can be quickly transferred to an appropriate area, so that the feeling of strangeness that it becomes dark to human eyes is eliminated. In addition, it is possible to reduce the supply input to the illuminating lamp that does not contribute much to the brightness of the room, and it is possible to obtain a dimming control method for the illuminating lamp that achieves an energy saving effect that the electricity bill can be saved.
[0042]
In addition, the illuminance of artificial light and natural light from the illuminating lamp is detected by a plurality of light detectors, and when the output difference between the light detectors is zero and the illuminance of natural light decreases, the supply input is set to a predetermined value. The power supply input to the illuminating lamp does not change even if the person crosses the lower part of the illuminating lamp or the person stops below the illuminating lamp. The dimming degree of the illuminating lamp does not change. As a result, a dimming control method for an illuminating lamp can be obtained that can always maintain the brightness of the entire room appropriately and stably.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of a lighting device according to the present invention.
FIG. 2 is a flowchart showing the operation of the first and second embodiments.
FIG. 3 is a timing chart showing the operation of the first embodiment.
4 is a timing chart showing the operation of the second embodiment. FIG.
FIG. 5 is a flowchart showing the operation of the third embodiment.
6 is a timing chart showing the operation of the third embodiment. FIG.
FIG. 7 is a flowchart showing the operation of the fourth embodiment.
FIG. 8 is a configuration diagram illustrating a conventional lighting device.
FIG. 9 is a configuration diagram illustrating another conventional lighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Commercial power supply, 2 Rectification / smoothing circuit, 3 Converter, 4 Light control circuit, 5 light sensor, 5a 1st light sensor, 5b 2nd light sensor, 6 Inverter, 7 Coil, 8 Illumination lamp, 9 Control circuit Department.

Claims (9)

In the dimming control method for controlling the dimming of the illuminating lamp by detecting the illuminance including artificial light and natural light from the illuminating lamp with a photodetector,
A first step of setting a supply input to the illumination lamp to a first predetermined value at the start of lighting;
A second step of reducing the supply input to the illuminating lamp by a second predetermined value and detecting the illuminance before and after the decrease by the photodetector;
A third step of increasing the supply input to the illuminating lamp by a third predetermined value when the change rate of the illuminance detected in the second step is equal to or greater than a predetermined threshold;
A dimming control method for an illuminating lamp, characterized in that the supply input to the illuminating lamp is reduced by repeating the second step and the third step in accordance with the amount of natural light . The dimming control method for an illuminating lamp according to claim 1, wherein the first predetermined value is a value for lighting the illuminating lamp at a maximum output . 3. The illumination according to claim 1, wherein the rate of change is a calculated value obtained by dividing the difference in illuminance before and after the decrease detected by the photodetector in the second step by the illuminance before the decrease. Light dimming control method. 4. The dimming control method for an illuminating lamp according to claim 1, wherein the third predetermined value is set to be larger than the second predetermined value . In the second step,
Comparing the difference between the reduced illuminance detected by the optical detector and the reduced illuminance detected by the optical detector in the previous second step with a predetermined second threshold;
If the output difference is less than the second threshold, the process proceeds to the third step,
5. The dimming control device for an illumination lamp according to claim 1, wherein if the second threshold value or more, the process returns to the first step . 6. Illuminance including artificial light and natural light from the illuminating lamp is detected by a plurality of photodetectors, and when the output difference between the plurality of photodetectors becomes less than a predetermined third threshold, In the dimming control method for calculating the average illuminance based on and controlling the dimming of the illuminating lamp ,
A first step of setting a supply input to the illumination lamp to a first predetermined value at the start of lighting;
A second step of reducing the supply input to the illuminating lamp by a second predetermined value and calculating an average illuminance before and after the reduction based on outputs of the plurality of photodetectors;
A third step of increasing the supply input to the illuminating lamp by a third predetermined value when the change rate of the average illuminance calculated in the second step is equal to or greater than a predetermined first threshold;
A dimming control method for an illuminating lamp, characterized in that the supply input to the illuminating lamp is reduced by repeating the second step and the third step in accordance with the amount of natural light. 7. The dimming control method for an illuminating lamp according to claim 6, wherein the first predetermined value is a value for lighting the illuminating lamp at a maximum output. The rate of change is a calculated value obtained by dividing the difference in average illuminance before and after the decrease calculated based on the outputs of the plurality of photodetectors in the second step by the average illuminance before the decrease. The dimming control method for an illumination lamp according to claim 6 or 7. In the second step,
Difference between the reduced average illuminance calculated based on the outputs of the plurality of photodetectors and the decreased average illuminance calculated based on the outputs of the plurality of photodetectors in the previous second step To a predetermined second threshold,
The process proceeds to the third step when the difference is less than the second threshold value, and returns to the first step when the difference is greater than or equal to the second threshold value. The dimming control apparatus of the illumination lamp in any one of thru | or 8 .

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