JP4149246B2 - Lighting control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting control device that controls lighting states of a plurality of light emitters arranged on a road.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in the field of ITS (Intelligent Transport Systems), a line-of-sight guidance sign, a so-called delineator, for guiding a driver's line of sight at night, during rainfall, and in dense fog is known. The delineator is used to prevent a traffic accident by guiding the driver's line of sight by clearly indicating the road alignment along the side of the roadway. This delineator includes a reflection type in which illumination from a vehicle is reflected by a reflector, and a self-light emission type in which light is emitted by a light emitter. In particular, the self-luminous type uses a high-luminance illuminant to improve visibility and is effective in preventing traffic accidents.
[0003]
By the way, since the field of view becomes worse at night or in dense fog, it is necessary to make the luminous body emit light with higher brightness than usual. Therefore, a self-light-emitting road sign system that changes the light emission luminance of the light emitters according to the weather conditions has been proposed. In this self-luminous road sign system, the optimum light emission luminance with a constant contrast is calculated based on the road background luminance obtained by the illuminometer, and the visibility information output from the visibility meter is calculated based on the optimum light emission luminance. Based on this, the delineator is controlled (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
WO 01/15116 Pamphlet
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional self-light-emitting road sign system, in order to change the light emission luminance of the delineator, a control signal for controlling the light emission luminance of the delineator is transmitted in addition to the power line that supplies power for turning on the delineator. This requires a control line to increase the number of wirings used.
[0006]
Also, when controlling a delineator installed at a remote location, the wiring length becomes longer, the installation cost increases, and the level of power and control signals supplied due to transmission loss, etc., decrease, and the lighting state of the delineator is stabilized. In some cases, it is difficult to control.
[0007]
An object of the present invention is to minimize the number of wires used for controlling the lighting state of a light emitter, and to stably control the lighting state of a light emitter set at a remote location. It is providing the lighting control apparatus which can do.
[0008]
[Means for Solving the Problems]
A lighting control device according to the present invention is a lighting control device that controls the lighting state of a light emitter installed on a road, A main control device comprising an AC voltage source and selection means; and a sub-control device comprising a rectification means, a DC conversion means and a control means, and connected to the main control device via a power line, the AC voltage The source supplies a predetermined AC voltage, and the selection unit generates a plurality of AC transformers having a plurality of AC voltages having different voltage levels based on the AC voltage supplied from the AC voltage source, By selectively supplying an AC voltage output from the AC voltage source to any one of the plurality of transformer transformers in accordance with a control signal from a control circuit, a plurality of AC voltages can be output via the power line. And a switching circuit that selectively supplies one AC voltage to the rectifying means, and the rectifying means includes the Through the power line From the selection means The supplied AC voltage is rectified to output a DC voltage having a voltage level corresponding to the voltage level of the AC voltage. And the DC conversion means includes the Output from rectifier Having a voltage level corresponding to the voltage level of the AC voltage Converts DC voltage to DC constant voltage at a specified voltage level A DC constant voltage circuit, and the control means includes the DC constant voltage converted by DC conversion means is used as its own power supply An arithmetic circuit and a light emitter driving circuit, wherein the arithmetic circuit detects a voltage level of a DC voltage having a voltage level corresponding to the voltage level of the AC voltage output from the rectifier, and detects the detected DC voltage. The light emitter driving circuit is configured so that the lighting state of the light emitter is in the lighting state associated with the voltage range including the voltage level of the DC voltage by comparing the voltage level of the light source with a plurality of preset voltage ranges. Control Is.
[0009]
In the lighting control device according to the present invention, the AC voltage supplied via the power line is rectified to create a DC voltage, the DC voltage is converted into a DC constant voltage of a predetermined voltage level, and the converted DC constant voltage The control means that uses as a power source controls the lighting state of the light emitter according to the voltage level of the rectified DC voltage. Thus, since the control means controls the lighting state of the light emitter according to the voltage level of the DC voltage obtained by rectifying the AC voltage supplied from the power line, the DC voltage can be changed by changing the voltage level of the AC voltage. The lighting state of the light emitter can be controlled by changing the voltage level of the light source, and the change in the voltage level of the AC voltage supplied via the power line can be used as a control signal. Therefore, since the power line can be shared for power supply and transmission of control signals, the wiring used can be reduced to only the power line. Further, since the control means operates with a stable DC constant voltage created from a DC voltage obtained by rectifying the AC voltage, the control operation can be stably performed even if the voltage level of the AC voltage changes. As a result, the number of wirings used for controlling the lighting state of the light emitter can be minimized, and the lighting state of the light emitter set at a remote location can be stably controlled.
[0011]
In this case, the lighting state of the light emitter is controlled so that the lighting state associated with the voltage range including the voltage level of the DC voltage is obtained by comparing the voltage level of the DC voltage with a plurality of preset voltage ranges. Therefore, even if the voltage level of the DC voltage fluctuates due to long-distance transmission, the lighting state of the light emitter can be accurately controlled as long as the fluctuation range is within a predetermined voltage range.
[0013]
In this case, a plurality of AC voltages having different voltage levels are created based on the AC voltage supplied from the AC voltage source, and one AC voltage is selectively selected from the plurality of AC voltages via the power line as the rectifying means. Since the AC voltage is rectified and a DC voltage is output, a DC voltage having a voltage level corresponding to the voltage level of one AC power among a plurality of AC voltages can be supplied to the control means. And the light emitter can be controlled to be in a lighting state corresponding to the voltage level of the AC power.
[0015]
In this case, even if the sub-control device is controlled by the main control device via the power line and the sub-control device is installed at a remote location, the sub-control device can be stably controlled by the main control device. It is possible to stably control the lighting state of the light emitters installed in the main controller.
[0016]
It is preferable that the illuminant includes an illuminant of a line-of-sight guide label, and the control means controls the light emission state of the line-of-sight label. In this case, the lighting state of the line-of-sight guidance sign can be controlled using only the power line, and the lighting state of the line-of-sight guidance sign set at a remote location can be stably controlled.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a lighting control device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a road traffic support system using a lighting control device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of the road traffic support system shown in FIG. is there.
[0018]
1 and 2 includes a main controller 1, a plurality of sub-controllers 2a, 2b, 2c,..., A plurality of line-of-sight guidance signs 3a, 3b, 3c,. An information display board 5 is provided. The main controller 1, the plurality of sub-controllers 2a, 2b, 2c,..., The plurality of line-of-sight guidance signs 3a, 3b, 3c, the weather condition detection sensor 4 and the information display board 5 are installed along the road side of the road RD. . The main controller 1 centrally controls a plurality of sub-controllers 2a, 2b, 2c,... And may be installed in a remote place such as a central management center.
[0019]
A plurality of sub-controllers 2a, 2b, 2c,... Are installed at different positions on the road and are connected to the main controller 1 via a two-core power line 6. A plurality of line-of-sight guidance signs 3a, 3b, 3c are connected to each of the sub-controllers 2a, 2b, 2c,... In this embodiment, three line-of-sight guidance signs 3a, 3b, 3c are provided for each sub-controller. Is connected. In FIG. 1, only the sub-controller 2a and the line-of-sight guidance signs 3a, 3b, and 3c connected to the sub-controller 2a are illustrated.
[0020]
The line-of-sight guidance sign 3a is a so-called delineator in which a light-emitting body 31a for performing self-luminous display is provided above the support column 32a. The shape of the line-of-sight guidance mark 3a is, for example, a circular shape. A light emitting diode (LED) or the like is used. The other gaze guidance signs 3b and 3c are the same as described above.
[0021]
The shape or the like of the line-of-sight guidance sign is not particularly limited to the above example. For example, other shapes such as an elliptical shape or a square shape may be used, and the display form may be an arrow display or an arrow feather display. Alternatively, a laser, an EL (electroluminescence), an ultraviolet (UV) lamp, an optical fiber that guides light from a light source, and the like may be used as the light emitter.
[0022]
The weather condition detection sensor 4 is connected to the main controller 1. The weather condition detection sensor 4 is a sensor that detects the weather condition on the road RD, and for example, a visibility meter and an illuminometer are used. A visibility meter is a weather observation instrument for measuring the concentration of suspended matter in the atmosphere by irradiating near infrared rays and measuring the brightness of the outside air. There are a transmission type visibility meter and a reflection type visibility meter. The illuminometer measures the illuminance in the driving environment such as fog and snow over the day and night. For example, the luminous intensity of the line-of-sight guidance signs 3a, 3b, 3c is appropriate for the driver's eyes based on the measurement data obtained by the illuminometer. It is controlled to become. The weather condition detection sensor is not particularly limited to the above example, and may include other sensors that observe the weather condition, such as a wind direction / anemometer, a thermometer, and a hygrometer. Moreover, although the weather condition detection sensor 4 is provided with a visibility meter or the like, the line-of-sight guidance sign 3a or the like may be provided with a visibility meter or the like.
[0023]
The main controller 1 supplies power to the sub-controllers 2a, 2b, 2c,... By supplying an AC voltage via the power line 6. Further, the main controller 1 changes the voltage level of the AC voltage transmitted through the power line 6 to change the line-of-sight guidance signs 3a, 3b, 3c based on the weather conditions output from the weather condition detection sensor 4. The light emission state is controlled using the sub-controllers 2a, 2b, 2c,. In addition, when not controlling the light emission state of each gaze guidance sign 3a, 3b, 3c based on a weather condition etc., you may abbreviate | omit the weather condition detection sensor 4. FIG.
[0024]
The sub-controllers 2a, 2b, 2c rectify the AC voltage supplied from the main controller 1 through the power line 6 to create a DC voltage, convert the DC voltage into a DC constant voltage at a predetermined voltage level, and convert the DC voltage. The DC constant voltage is used as its own power source, and the light emitting states of the light emitters 31a, 31b, and 31c are controlled according to the voltage level of the DC voltage after rectification.
[0025]
Here, an example of a method for controlling the light emission luminance of the light emitters 31a, 31b, 31c by the main controller 1 and the sub-controllers 2a, 2b, 2c,... Using the weather condition detection sensor 4 will be described. Since the light emitters 31a, 31b, and 31c are the same, a method for controlling the light emission luminance of the light emitter 31a of the sub-controller 2a will be described below.
[0026]
First, it is necessary to set the background luminance with respect to the illuminance in advance. This background luminance is the reflection luminance of sunlight, and as an example, the white reflection luminance of snow is set. Then, the main controller 1 calculates the environmental illuminance (illuminance information) based on the measurement data of the illuminometer, and then calculates the light emission luminance that makes the contrast constant with respect to the change in the background luminance. This contrast is represented by the difference or ratio between the light emission luminance of the light emitter 31a and the background luminance or the ratio between the difference and the background luminance. Then, the main controller 1 exchanges AC as a control signal for correcting the light emission luminance so that the predetermined light emission luminance is obtained based on the transmittance calculated from the measurement value obtained by the visibility meter at a specific point that the driver wants to visually recognize. The voltage level of the voltage is changed and supplied to the sub-controller 2a. The sub-controller 2a controls the light emission state of the light emitter 31a so that the light emission brightness of the light emitter 31a is corrected according to the voltage level of the AC voltage.
[0027]
In this way, the optimum light emission luminance is calculated based on the illuminance information output from the illuminometer so that a constant contrast is obtained, and light emission is performed according to the visibility information output from the visibility meter based on the calculated optimum light emission luminance. Since the body is dimmed, the illuminant can be dimmed according to the weather conditions, and the illuminant is appropriately dimmed to the driver of the vehicle located in the visibility-impaired area, improving visibility. Can contribute to safe driving.
[0028]
The information display board 5 displays a plurality of character information stored in advance according to the traveling environment of the road RD, and displays various road information based on the weather conditions detected by the weather condition detection sensor 4. As the character information displayed on the information display board 5, for example, characters that prompt the driver to drive safely, such as “safe driving”, “traveling caution”, and “forward warning” are displayed. The information display board 5 is provided with a light emitter as in the case of the line-of-sight guidance sign 3a and the like. As described above, the display part is based on the visibility value and the illuminance detected by the visibility meter and the illuminance meter. Is dimmed. The information display board 5 may also be controlled by the sub-controller 2a or the like to switch character information.
[0029]
FIG. 3 is a block diagram illustrating a configuration example of the main controller 1 and the sub controller 2a illustrated in FIG. The other sub-controllers 2b, 2c,... Are configured similarly to the sub-controller 2a described below and operate in the same manner.
[0030]
As shown in FIG. 3, the main controller 1 includes an AC power source 11, a switching circuit 12, a control circuit 13, and transformer transformer units 14 to 16. The sub-controller 2 a includes a transformer transformer unit 21, a full-wave rectifier circuit 22, a direct current. A constant voltage circuit 23, an arithmetic circuit 24, and a light emitter driving circuit 25 are provided.
[0031]
The AC power supply 11 outputs an AC voltage of 400 V to the switching circuit 12. The control circuit 13 outputs a control signal for selecting any one of the transformer transformers 14 to 16 to the switching circuit 12 based on the weather condition detected by the weather condition detection sensor 4. The switching circuit 12 is configured by a switch such as a magnet conductor, and selectively applies an AC voltage of 400 V output from the AC power supply 11 to any one of the transformer transformer units 14 to 16 according to a control signal of the control circuit 13. Supply.
[0032]
When an AC voltage of 400 V (single amplitude) is supplied from the switching circuit 12, the transformer transformer 14 converts the AC voltage of 400 V into an AC voltage of a first voltage level, for example, an AC voltage of 200 V (single amplitude). And output to the sub-controller 2a through the power line 6. When an AC voltage of 400 V is supplied from the switching circuit 12, the transformer transformer 15 converts the AC voltage of 400 V into an AC voltage of a second voltage level, for example, an AC voltage of 170 V (single amplitude), and the power line 6 To the sub-controller 2a. When an AC voltage of 400V is supplied from the switching circuit 12, the transformer transformer 16 converts the AC voltage of 400V into an AC voltage of a third voltage level, for example, an AC voltage of 140V (single amplitude), and the power line 6 To the sub-controller 2a.
[0033]
For example, as a relationship between the voltage level of the AC voltage output from the main controller 1 and the light emission state of the light emitters 31a, 31b, and 31c, a light emission state with high luminance is obtained with respect to the 200V AC voltage output from the main controller 1. The light emission state of medium luminance is associated with the AC voltage of 170V, and the light emission state of low luminance is associated with the AC voltage of 140V.
[0034]
Therefore, when the control circuit 13 determines that the light emission luminance of the light emitters 31a, 31b, and 31c needs to be set high from the weather conditions of the weather condition detection sensor 4, the AC power supply 11 and the transformer transformer 14 are connected. A control signal for output is output to the switching circuit 12. Similarly, when the control circuit 13 determines that the light emission luminance needs to be set to the middle, the control circuit 13 outputs a control signal for connecting the AC power source 11 and the transformer transformer 15 to the switching circuit 12, and the light emission luminance is set. When it is determined that it is necessary to set a low value, a control signal for connecting the AC power supply 11 and the transformer transformer 16 is output to the switching circuit 12.
[0035]
The relationship between the voltage level of the AC voltage and the light emission state is not particularly limited to the above example, and various changes such as using other voltage levels or setting two or more voltage levels are possible. Is possible.
[0036]
The transformer transformer 21 drops the voltage level of the AC voltage input via the power line 6, and outputs the AC voltage dropped to, for example, a half voltage level to the full-wave rectifier circuit 22. That is, the transformer transformer 21 converts the AC voltage of 200 V into an AC voltage of 100 V (single amplitude) when a 200 V AC voltage is input, and converts the AC voltage of 170 V when the AC voltage of 170 V is input. When an alternating voltage of 85V (single amplitude) is input and a 140V alternating voltage is input, the alternating voltage of 140V is converted to an alternating voltage of 70V (single amplitude). In addition, when the alternating voltage input via the power line 6 can be supplied to the full-wave rectifier circuit 22 as it is, the transformer transformer 21 may be omitted.
[0037]
The full-wave rectifier circuit 22 includes a diode bridge circuit, a smoothing capacitor, and the like, rectifies the AC voltage output from the transformer transformer 21 into a DC voltage, and has a DC voltage level corresponding to the AC voltage level of the AC voltage. The voltage is output to the DC constant voltage circuit 23. For example, the full-wave rectifier circuit 22 converts a DC voltage of about 70V when a 100V AC voltage is input, and converts it to a DC voltage of about 60V when an AC voltage of 85V is input. When voltage is input, it is converted to a DC voltage of about 50V. Note that the method of converting the AC voltage to the DC voltage is not particularly limited to the above full-wave rectification, and other rectification methods such as half-wave rectification may be used.
[0038]
The DC constant voltage circuit 23 performs DC / DC conversion on the DC voltage output from the full-wave rectifier circuit 22 and supplies a predetermined voltage level, for example, 30 V DC constant voltage to the arithmetic circuit 24. The 30 V DC constant voltage output from the DC constant voltage circuit 23 is used as a power source for the arithmetic circuit 24, the light emitter drive circuit 25, and the like.
[0039]
The arithmetic circuit 24 detects the DC voltage level of the DC voltage output from the full-wave rectifier circuit 22, compares the detected DC voltage level with a plurality of preset voltage ranges, and includes the DC voltage level. The light emitter drive circuit 25 is controlled so that the light emitting states of the light emitters 31a, 31b, and 31c are in the lighting state associated with the voltage range. As the voltage range of the DC voltage, for example, a first voltage range of 65V or more and less than 75V, a second voltage range of 55V or more and less than 65V, and a third voltage range of 45V or more and less than 55V are used. It is determined whether the DC voltage level of the DC voltage output from the full-wave rectifier circuit 22 belongs to the first to third voltage ranges. When the DC voltage level belongs to the first voltage range, a light emission state with high luminance is obtained. As described above, the light emitter driving circuit 25 is controlled so that the light emission state has a medium luminance when it belongs to the second voltage range, and the light emission state has a low luminance when it belongs to the third voltage range.
[0040]
The setting of the voltage range is not particularly limited to the example in which the upper margin and the lower margin are uniformly set, and the influence of the length of the power line 6 from the main controller 1 to the sub controller 2a, that is, the AC voltage by the power line 6 In consideration of this voltage drop, a voltage range with an offset corresponding to the voltage drop may be set, and various changes are possible.
[0041]
The light emitter drive circuit 25 drives the light emitters 31a, 31b, and 31c so that the light emission states of the light emitters 31a, 31b, and 31c are in a lighting state associated with a voltage range including the DC voltage level. Therefore, in the light emitters 31a, 31b, and 31c, when the DC voltage level of the DC voltage output from the full-wave rectifier circuit 22 belongs to the first voltage range (when an AC voltage of 200 V is supplied from the main controller 1). Is high luminance and belongs to the second voltage range (when the AC voltage of 170V is supplied from the main controller 1), is medium luminance and belongs to the third voltage range (the AC voltage of 140V from the main controller 1). Each of which emits light at low luminance.
[0042]
In the present embodiment, the main controller 1 and the plurality of sub-controllers 2a, 2b, 2c,... Correspond to an example of a lighting control device, and the transformer transformer 21 and the full-wave rectifier circuit 22 correspond to an example of a rectifier. The DC constant voltage circuit 23 corresponds to an example of DC conversion means, and the arithmetic circuit 24 and the light emitter driving circuit 25 correspond to an example of DC conversion means. The AC power source 11 corresponds to an example of an AC voltage source, the switching circuit 12, the control circuit 13, and the transformer transformers 14 to 16 correspond to an example of a selection unit, and the main controller 1 corresponds to an example of a main controller. Sub-controllers 2a, 2b, 2c,... Correspond to an example of a sub-control device.
[0043]
As described above, in the present embodiment, the light emitter 31a according to the DC voltage level of the DC voltage output from the full-wave rectifier circuit 22, that is, the AC power level of the AC voltage supplied from the main controller 1 via the power line 6. , 31b, 31c can be controlled so that the power line 6 can be shared for power supply and transmission of control signals, and wiring between the main controller 1 and the sub-controllers 2a, 2b, 2c,. Can be reduced to the power line 6 only.
[0044]
In addition, since the DC constant voltage created by the DC constant voltage circuit 23 using the AC voltage supplied from the main controller 1 via the power line 6 is used as the power source for the arithmetic circuit 24 and the light emitter drive circuit 25, the power line 6, even if the AC voltage level of the AC voltage supplied from the main controller 1 varies through the arithmetic circuit 24 and the light emitter driving circuit 25 using the stable DC constant voltage output from the DC constant voltage circuit 23. It operates stably, and the lighting state of the light emitters 31a, 31b, 31c can be controlled stably.
[0045]
As a result, in the present embodiment, the wiring used to control the lighting state of the light emitters 31a, 31b, 31c can be reduced to only the power line 6, and the light emitters 31a, 31a, The lighting states of 31b and 31c can be controlled stably.
[0046]
In the above description, the luminances of the light emitters 31a, 31b, and 31c are dimmed in three levels using three types of AC voltage levels, but the dimming state of the light emitters can be variously changed. An example will be described.
[0047]
FIG. 4 is a schematic diagram for explaining another control example of the light emitter. The line-of-sight guide label 7 shown in FIG. 4 includes a green light emitter L1, a yellow light emitter L2, and a red light emitter L3, and each light emitter L1 to L3 is configured to be individually turnable on / off. At this time, the 200 V AC voltage output from the main controller 1 is associated with the on state of the green light emitter L1 (the other light emitters L2 and L3 are off), and the yellow voltage is applied to the 170 V AC voltage. The on state of the light emitter L2 (the other light emitters L1 and L3 are in the off state) is associated, and the on state of the red light emitter L3 (the other light emitters L1 and L2 are in the off state) with respect to the AC voltage of 140V. In the same manner as described above, the on / off states of the light emitters L1 to L3 can be individually controlled by the sub-controller 2a or the like.
[0048]
For example, when the voltage level of the AC voltage output from the main controller 1 changes in the order of 200V → 170V → 140V, as shown in FIGS. 4A to 4C, the green light emitter L1 → the yellow light emitter. The light can be turned on in the order of L2 → red light emitter L3, and the emission color can be controlled.
[0049]
FIG. 5 is a schematic diagram for explaining still another control example of the light emitter. The line-of-sight guidance mark 8 shown in FIG. 5 has three light emitters L4 to L6, and each light emitter L4 to L6 is configured to be turned on / off individually. At this time, the 200V AC voltage output from the main controller 1 is associated with the ON state of the light emitter L6 (the other light emitters L4 and L5 are OFF), and the light emitter L5 is associated with the 170V AC voltage. The on state of L6 (the other light emitters L4 are in the off state) is associated, the on states of the light emitters L4 to L6 are associated with the AC voltage of 140 V, and each light emitter is controlled by the sub controller 2a or the like in the same manner as described above. The number of lighting can be controlled by individually controlling the on / off states of L4 to L6.
[0050]
For example, when the voltage level of the AC voltage output from the main controller 1 changes in the order of 200V → 170V → 140V, as shown in FIGS. 5A to 5C, the light emitter L6 is turned on → the light emitter L5. It is possible to increase the number of lighting of the light emitters by changing the number of lighting of the light emitters L4 to L6 in the order of lighting of L6 → lighting of the light emitters L4 to L6.
[0051]
In the above description, the example of controlling the luminous body of the line-of-sight guidance sign has been described. However, the present invention is not particularly limited to this example, and for example, it is continuously installed along the roadside line and the center line of the road. You may control lighting of the light-emitting body used for a linear pointer. In this case, the road alignment can be recognized by the driver even during heavy fog or at night, which can contribute to prevention of traffic accidents.
[0052]
Moreover, you may control lighting of the light-emitting body used for the guide light etc. which are installed in the sharp curve area etc. where a road width is narrow. For example, a first vehicle detection sensor that detects a first vehicle on one of a plurality of guide lights installed at predetermined intervals along a road, and a second vehicle detection sensor that detects a second vehicle on the other side When a vehicle is detected by the first and second vehicle detection sensors, a detection signal is transmitted to the main controller 1. At this time, the main controller 1 transmits an AC voltage for controlling the light emitters of the guide lights to blink, and the sub controller controls the respective light emitters so as to face the driver. A vehicle approach warning, deceleration and line-of-sight guidance can be promoted.
[0053]
Further, a speed detection sensor for detecting the moving speed of the vehicle may be further provided, and the light emitter may be lit so as to flow according to the moving speed of the vehicle detected by the speed detecting sensor. For example, the driver's line of sight can be reliably guided by turning on the light emitter so as to flow at a speed faster than the moving speed of the vehicle detected by the speed detection sensor. In addition, by installing on a road with poor visibility such as a curve, a driver of a vehicle traveling on the road can visually recognize the alignment of the road, which can contribute to prevention of traffic accidents.
[0054]
【The invention's effect】
As described above, according to the present invention, a change in the voltage level of the AC voltage supplied from the power line can be used as a control signal, and a stable DC constant voltage created from a DC voltage obtained by rectifying the AC voltage. Since the control means can be operated by this, the control operation can be performed stably, so that the number of wirings used for controlling the lighting state of the light emitter can be minimized and set in a remote place. The lighting state of the luminous body can be controlled stably.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of a road traffic support system using a lighting control device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of the road traffic support system shown in FIG.
3 is a block diagram showing a configuration example of a main controller and a sub controller shown in FIG. 2. FIG.
FIG. 4 is a schematic diagram for explaining another control example of the light emitter.
FIG. 5 is a schematic diagram for explaining still another control example of the light emitter.
[Explanation of symbols]
1 Main controller
2a, 2b, 2c, ... sub-controller
3a, 3b, 3c, 7, 8 Gaze guidance sign
11 AC power supply
12 Switching circuit
13 Control circuit
14-15 Transformer transformer
21 Transformer transformer
22 Full-wave rectifier circuit
23 DC constant voltage circuit
24 Arithmetic circuit
25 Light emitter drive circuit
31a, 31b, 31c luminous body

Claims (2)

A lighting control device that controls the lighting state of a light emitter installed on a road,
A main controller comprising an AC voltage source and selection means;
Comprising a rectifier, a DC converter and a controller, and a sub controller connected to the main controller via a power line;
The AC voltage source supplies a predetermined AC voltage,
The selection unit controls a plurality of transformer transformers that create a plurality of AC voltages having different voltage levels based on an AC voltage supplied from the AC voltage source, and an AC voltage output from the AC voltage source. By selectively supplying one of the plurality of transformer transformers according to a control signal from the circuit, one AC voltage is selected as the rectifying means from the plurality of AC voltages via the power line. And a switching circuit for supplying automatically,
The rectifying means rectifies the AC voltage supplied from the selection means via the power line and outputs a DC voltage having a voltage level corresponding to the voltage level of the AC voltage ;
The DC converting means comprises a DC constant voltage circuit for converting a DC voltage having a voltage level corresponding to the voltage level of the AC voltage output from said rectifying means to a DC constant voltage having a predetermined voltage level,
The control means includes an arithmetic circuit and a light emitter driving circuit that use the DC constant voltage converted by the DC conversion means as its own power source ,
The arithmetic circuit detects a voltage level of a DC voltage output from the rectifying means and having a voltage level corresponding to the voltage level of the AC voltage, and the detected voltage level of the DC voltage and a plurality of preset voltage ranges And controlling the light emitter driving circuit so that the lighting state of the light emitter is in the lighting state associated with the voltage range including the voltage level of the DC voltage . The illuminant includes an illuminant with a line-of-sight label,
The control means, the lighting control device according to claim 1, wherein the controlling the light emitting state of the visual guidance label.

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