JP6701889B2 - Signal control device - Google Patents

Description

  The present invention relates to a technique for controlling the lighting brightness of a signal light of a traffic signal installed at an intersection or the like.

  Conventionally, traffic lights are installed at intersections of road networks. As is well known, traffic lights are installed for the purpose of smoothing traffic and preventing traffic accidents. Recently, switching from a light bulb type in which a signal light is an electric light bulb to an LED type in which a signal light is an LED is progressing. The LED type traffic light has the advantages of reduced power consumption and longer life of the traffic light than the light bulb type traffic light, and can reduce operating costs.

  Further, Patent Document 1 proposes to further reduce the power consumption of the LED traffic light. Patent Document 1 proposes to reduce the power consumption without lowering the visibility of the lighting state of the signal light by lowering the lighting brightness of the signal light as the surroundings of the traffic light are darker. This patent document 1 is a structure which adjusts the lighting brightness of a signal light by controlling the duty ratio which turns on/off the DC power supply supplied to a signal light according to the brightness of the surroundings of a signal light.

JP 2001-297399 A

  However, the types of installed LED traffic lights may be different at adjacent intersections. The LED type traffic light differs in the LED element which is a signal light, the lighting circuit for lighting the LED element, and the like depending on the type. For this reason, when the types of the LED traffic lights installed at two adjacent intersections are different, the signal lights of the LED traffic lights installed at one intersection are dark, and the LED traffic lights installed at the other intersection are different. The lighting brightness of the signal light may be bright (the lighting brightness of the signal light may vary at two adjacent intersections).

  In such a situation, the driver of a vehicle that enters one of the intersections and travels toward the other intersection may change the traffic light installed at the relatively bright intersection to the traffic light of the one intersection that is about to enter. May be mistaken for it. That is, if the lighting brightness of the signal light of the LED type traffic light varies at two adjacent intersections, there is a possibility that the driver of the vehicle may misidentify the traffic light.

  Note that Patent Document 1 is intended to reduce power consumption in a traffic signal without lowering visibility, and does not suppress variation in lighting brightness of signal lights among traffic signals.

  It is an object of the present invention to provide a technique capable of lighting a signal lamp with a set brightness by a simple operation of setting the type even if the traffic signal is of a different type.

  The signal control device of the present invention is configured as follows in order to achieve the above object.

The type setting unit sets the type of traffic light. The power supply unit supplies power to the connected traffic signal to light the traffic light. The storage unit stores, for each type of traffic light, a dimming parameter that controls the magnitude of the power supplied to the traffic light by the power supply unit to the magnitude at which the traffic light of the traffic light is turned on at the set brightness. The power control unit controls the magnitude of the power supplied to the traffic signal by the power supply unit, using the dimming parameter according to the type of the traffic signal set in the type setting unit.
Further, the storage unit stores a dimming pattern in which a dimming parameter is associated with each of the set luminances for each of the set luminances, for each type of traffic light, and the power control unit is set by the type setting unit. The power supply unit controls the magnitude of the power supplied to the traffic light by the dimming parameter according to the type of traffic light and the dimming pattern instructed by the external device.

In this configuration, the type setting unit sets the type of the connected traffic signal, so that the signal light of the traffic signal lights in the dimming pattern (instructed set brightness) instructed by the external device . That is, regardless of the type of traffic signal connected, the signal lamp can be turned on with the set brightness instructed by the external device by a simple operation of setting the type. Therefore, even if the types of the LED type traffic lights installed at two adjacent intersections are different, the variation in the lighting brightness of the signal lights can be suppressed. Therefore, it is possible to reduce the possibility that a vehicle driver or the like mistakenly recognizes a traffic light.

  Further, the storage unit may be configured to store the dimming parameter for each color of the signal light. According to this structure, the signal light can be turned on with the brightness according to the visibility of the color.

  Further, the dimming parameter may be a duty ratio used for phase modulation control of a commercial power supply which is an input of the power supply unit.

  In addition, a brightness input unit to which the lighting brightness of the signal lamp is input is additionally provided, and the power control unit compares the lighting brightness of the signal lamp input to the brightness input unit with the set brightness and stores it based on the comparison result. You may make it the structure which updates the light control parameter which a part memorize|stores.

  According to this structure, it is possible to suppress the influence of the deterioration of the signal light, the deterioration of the lighting circuit of the signal light, and the like, and light the signal light at the set brightness.

  Further, a brightness measuring unit that measures the lighting brightness of the signal lamp and inputs the measured brightness to the brightness input unit may be provided.

  According to the present invention, even with traffic signals of different types, the signal lamp can be turned on with the set brightness by a simple operation of setting the types.

It is a block diagram which shows the structure of the principal part of a signal control apparatus. 2A and 2B are diagrams showing a dimming pattern table. 3A is a waveform of the commercial power source, and FIG. 3B is a phase modulation waveform output by the power supply unit. It is a flow chart which shows operation of an electric power control part. It is a block diagram which shows the structure of the principal part of the signal control apparatus concerning another example. It is a flowchart which shows a light adjustment parameter update process.

  Hereinafter, a signal control device that is an embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing the configuration of the main part of the signal control device according to this example. The signal control device 1 according to this example supplies, to the connected traffic signal 50, electric power with which the traffic signal 50 lights the signal lights 51 to 53. The traffic light 50 includes signal lights 51 to 53 and lighting circuits 54 to 56.

  The signal control device 1 is connected to a control center (not shown). The signal control device 1 controls signal control parameters (cycle, offset, split) for controlling the lighting of the signal lights 51 to 53 from the control center, and instructions for a dimming pattern for dimming the lighting brightness of the signal lights 51 to 53. A signal is input. Further, the signal control device 1 switches the signal lights 51 to 53 to be turned on for the traffic light 50 based on the signal control parameter instructed by the control center.

  The signal lamp 51 is composed of a plurality of LEDs whose emission color is blue. The signal lamp 52 is composed of a plurality of LEDs whose emission color is yellow. The signal lamp 53 is composed of a plurality of LEDs whose emission color is red. The lighting circuit 54 converts the AC power supplied from the signal control device 1 into a DC power, and lights the signal lamp 51. The lighting circuit 55 converts the AC power supplied from the signal control device 1 into a DC power, and lights the signal lamp 52. The lighting circuit 56 converts the AC power supplied from the signal control device 1 into a DC power, and lights the signal lamp 53. The signal control device 1 supplies AC power to the lighting circuit 54 when turning on the signal lamp 51, and stops supplying AC power to the lighting circuit 54 when not turning on the signal lamp 51. Further, the signal control device 1 supplies AC power to the lighting circuit 55 when turning on the signal lamp 52, and stops supplying AC power to the lighting circuit 55 when not turning on the signal lamp 52. Further, the signal control device 1 supplies AC power to the lighting circuit 56 when turning on the signal lamp 53, and stops supplying AC power to the lighting circuit 56 when not turning on the signal lamp 53. That is, the signal control device 1 switches the signal lamps 51 to 53 to be lit by switching the supply and stop of the AC power to the lighting circuits 54 to 56.

  Note that the configuration in which the signal control device 1 switches the signal lamps 51 to 53 to be turned on based on the signal control parameter is known, and therefore the description thereof is omitted here.

  The signal control device 1 includes an oscillating unit 11, a frequency dividing unit 12, a setting unit 13, a storage unit 14, a power control unit 15, and a power supply unit 16.

  The oscillator 11 generates a clock signal from a commercial power source (AC100V). Specifically, the oscillator 11 generates a clock signal that generates a clock at the zero-cross timing of the commercial power supply. Therefore, the clock signal generated by the oscillation unit 11 is synchronized with the commercial power supply. The frequency of the clock signal generated by the oscillator 11 is 100 Hz (region where the commercial power source is 50 Hz) or 120 Hz (region where the commercial power source is 60 Hz).

  The frequency divider 12 divides the clock signal generated by the oscillator 11 and generates a phase control clock signal of several kHz to several tens of kHz. The phase control clock signal generated by the frequency divider 12 is also a clock signal synchronized with the commercial power supply.

  The setting unit 13 sets the type of the traffic light 50. The setting unit 13 is, for example, a DIP switch. The setting unit 13 corresponds to the type setting unit according to the present invention.

  The storage unit 14 stores the dimming pattern table shown in FIG. 2 for each type of traffic light 50. 2A is a dimming pattern table of the traffic light 50 of the type AAA, and FIG. 2B is a dimming pattern table of the traffic light 50 of the type BBB. Although not particularly shown in FIG. 2, the storage unit 14 also stores a dimming pattern table for other types of traffic signals 50 (the types of traffic signals 50 other than AAA and BBB shown in FIG. 2). ..

  In the dimming pattern table, as shown in FIG. 2, dimming parameters are set for a plurality of dimming patterns. In FIG. 2, three types of dimming patterns, patterns A, B, and C, are shown. In this example, the dimming parameters are the set brightness and the duty ratio (the duty ratio alone may be used). The dimming parameter is set for each of the signal lights 51 to 53 (for each color). The set brightness is a set value of the lighting brightness of the signal lights 51 to 53. The lighting brightness of the signal lights 51 to 53 is the brightness measured under predetermined measurement conditions. For example, it is the luminance measured by a luminance meter installed at a position 10 m away from the signal lights 51 to 53.

  The duty ratio is a duty ratio for turning on/off a commercial power supply which is supplied to the traffic light 50 as electric power for lighting the signal lights 51 to 53. The dimming parameter is such that when a commercial power supply that supplies the signal light 50 as electric power for lighting the signal lights 51 to 53 is turned on/off at a set duty ratio, the lighting brightness of the signal lights 51 to 53 is set to this duty ratio. The value that corresponds to the set brightness is set.

  As shown in FIG. 2, in the same dimming pattern, regardless of the type of the traffic light 50, the set brightness of the signal lights 51 to 53 is the same (the duty ratio is different).

  The power control unit 15 inputs to the power supply unit 16 a trigger signal for turning on/off a commercial power supply which is supplied to the traffic light 50 as power for lighting the signal lights 51 to 53. The power control unit 15 is a trigger for turning on/off the commercial power source with the type of the traffic light 50 set in the setting unit 13, the dimming pattern instructed at that time, and the duty ratio based on the signal lights 51 to 53 to be turned on. Generate a signal.

  The power supply unit 16 turns on/off a switching element such as an FET based on the trigger signal input from the power control unit 15, and performs phase modulation control of the commercial power supply. 3A is a waveform of the commercial power source input to the power supply unit, and FIG. 3B is a phase modulation waveform of the commercial power source output by the power supply unit. The duty ratio of the phase modulation waveform of the commercial power supply shown in FIG. 3(B) is (t/T). The power supply unit 16 supplies the commercial power supply having the phase modulation waveform shown in FIG. 3B as power for lighting the signal lights 51 to 53 to the traffic light 50. Therefore, the amount of electric power that lights the signal lights 51 to 53 supplied to the traffic signal 50 changes depending on the duty ratio for turning on/off the commercial power supply.

  The power supply unit 16 supplies the commercial power source having the phase modulation waveform shown in FIG. 3B to the lighting circuits 54 to 56 corresponding to the signal lamps 51 to 53 to be lit, and corresponds to the signal lamps 51 to 53 not to be lit. It is not supplied to the lighting circuits 54 to 56.

  The signal control device 1 according to this example sets the type of the traffic signal 50 to be connected at the time of installation. Specifically, the worker confirms the type of the traffic signal 50 to be connected, and sets the confirmed type of the traffic signal 50 in the setting unit 13.

  The operation of the signal control device 1 during operation will be described. FIG. 4 is a flowchart showing the operation of the power control unit. When the control center issues an instruction to switch the dimming pattern of the traffic light 50, the power control unit 15 reads the duty ratio corresponding to the dimming pattern instructed this time from the storage unit 14 (s1, s2).

  In s2, the power control unit 15 acquires the type of the traffic signal 50 connected to the main body of the signal control device 1 from the setting unit 13. The power control unit 15 searches the storage unit 14 for a dimming pattern table according to the type of the connected traffic signal 50. The power control unit 15 reads the duty ratio of the dimming pattern for which switching is instructed this time from the retrieved dimming pattern table (dimming pattern table according to the type of the connected traffic light 50), and is not shown. Update and store in memory. At this time, the power control unit 15 reads the duty ratios of the green signal (signal light 51), the yellow signal (signal light 52), and the red signal (signal light 53), and updates and stores them.

  Based on the signal control parameter, the power control unit 15 turns on/off the commercial power source at the duty ratio of the blue signal stored in the memory at that timing at the timing of turning on the signal light 51 (green signal) of the traffic light 50. A trigger signal is generated (s3, s4). The power control unit 15 uses the phase control clock signal input from the frequency dividing unit 12 to generate a trigger signal. The trigger signal generated by the power control unit 15 is input to the power supply unit 16. The power supply unit 16 turns on/off the commercial power supply based on the trigger signal input from the power control unit 15. As a result, the power supply unit 16 supplies to the lighting circuit 54 of the traffic light 50 a commercial power source having a waveform phase-modulated by the duty ratio of the blue signal of the dimming pattern instructed at that time. At this time, the power supply unit 16 does not supply the commercial power supply having the waveform phase-modulated with the duty ratio of the blue signal to the lighting circuits 55 and 56 of the traffic light 50.

  Therefore, the traffic light 50 turns on the signal lamp 51 by the commercial power source of the phase-modulated waveform supplied from the signal control device 1 to the lighting circuit 54. Therefore, the signal light 51 of the traffic light 50 is turned on at the set brightness of the blue signal of the dimming pattern instructed at that time.

  In addition, based on the signal control parameters, the power control unit 15 turns on the commercial power supply at the timing of turning on the signal lamp 52 (yellow signal) of the traffic light 50 at the duty ratio of the yellow signal stored in the memory at that time. A trigger signal for turning on/off is generated (s5, s6). The power control unit 15 uses the phase control clock signal input from the frequency dividing unit 12 to generate a trigger signal. The trigger signal generated by the power control unit 15 is input to the power supply unit 16. The power supply unit 16 turns on/off the commercial power supply based on the trigger signal input from the power control unit 15. As a result, the power supply unit 16 supplies the lighting circuit 55 of the traffic signal 50 with a commercial power source having a waveform phase-modulated with the duty ratio of the yellow signal of the dimming pattern instructed at that time. At this time, the power supply unit 16 does not supply the commercial power supply having the waveform phase-modulated with the duty ratio of the yellow signal to the lighting circuits 54 and 56 of the traffic light 50.

  Therefore, the traffic signal 50 turns on the signal lamp 52 by the commercial power source of the phase-modulated waveform supplied from the signal control device 1 to the lighting circuit 55. As a result, the signal light 52 of the traffic light 50 is turned on with the set brightness of the yellow signal of the dimming pattern instructed at that time.

  Further, based on the signal control parameter, the power control unit 15 turns on the commercial power source at the duty ratio of the red signal stored in the memory at that time at the timing of turning on the signal light 53 (red signal) of the traffic light 50. A trigger signal for turning on/off is generated (s7, s8). The power control unit 15 uses the phase control clock signal input from the frequency dividing unit 12 to generate a trigger signal. The trigger signal generated by the power control unit 15 is input to the power supply unit 16. The power supply unit 16 turns on/off the commercial power supply based on the trigger signal input from the power control unit 15. As a result, the power supply unit 16 supplies to the lighting circuit 56 of the traffic light 50 a commercial power supply having a waveform phase-modulated with the duty ratio of the red signal of the dimming pattern instructed at that time. At this time, the power supply unit 16 does not supply the commercial power supply having the waveform phase-modulated with the duty ratio of the red signal to the lighting circuits 54 and 55 of the traffic light 50.

  Therefore, the traffic light 50 turns on the signal lamp 53 by the commercial power source of the phase-modulated waveform supplied from the signal control device 1 to the lighting circuit 56. As a result, the signal light 53 of the traffic light 50 lights up at the set brightness of the red signal of the dimming pattern instructed at that time.

  The power control unit 15 repeats the processes of s1 to s8 described above.

  As a result, the signal control device 1 can perform the simple operation of setting the type of the traffic signal 50 connected to the setting unit 13 regardless of the type of the connected traffic signal 50, and the set brightness of the dimming pattern instructed at that time. The signal lights 51 to 53 can be turned on. Further, in the same dimming pattern, the set brightness of the signal lights 51 to 53 is the same regardless of the type of the traffic signal 50, so that even if the types of the traffic signals 50 installed at two adjacent intersections are different. By instructing the same dimming pattern, variations in the lighting brightness of the signal lights 51 to 53 can be suppressed. Therefore, it is possible to reduce the possibility that a vehicle driver or the like mistakenly recognizes a traffic light.

  Next, another example of the signal control device 1 will be described. FIG. 5 is a block diagram showing a configuration of a main part of a signal control device according to another example. In FIG. 5, the same components as those in FIG. 1 are designated by the same reference numerals. The signal control device 1 according to this example has a configuration in which a luminance signal input unit 21 and a luminance detection unit 22 are added. Further, the traffic light 50 is provided with light receiving elements 61 to 63 for detecting the lighting brightness of the signal lights 51 to 53, respectively. The light receiving elements 61 to 63 are attached to positions where the light emitted from the signal lamps 51 to 53 is received when the corresponding signal lamps 51 to 53 are turned on. For example, the light receiving elements 61 to 63 are attached such that their light receiving surfaces face the light emitting surfaces of some of the LEDs that form the signal lamps 51 to 53.

  The light receiving elements 61 to 63 are connected to the luminance signal input unit 21. The outputs of the light receiving elements 61 to 63 are input to the brightness signal input unit 21 as brightness signals. The light receiving elements 61 to 63 correspond to the brightness measuring section referred to in the present invention. The brightness signal input unit 21 corresponds to the brightness input unit according to the present invention.

  The brightness detection unit 22 detects the lighting brightness of the signal lights 51 to 53 based on the outputs of the light receiving elements 61 to 63 input to the brightness signal input unit 21. The brightness detection unit 22 inputs the detected lighting brightness of the signal lights 51 to 53 to the power control unit 15.

  The signal control device 1 according to this example measures the lighting brightness of the signal lights 51 to 53 of the traffic light 50 with respect to the signal control device 1 according to the above example, and if the measured lighting brightness is not appropriate, the corresponding adjustment is performed. A function for updating the duty ratio of the optical parameter is additionally provided.

  The measurement condition of the set brightness of the dimming pattern registered in the dimming pattern table shown in FIG. 2 is the lighting brightness of the signal lights 51 to 53 measured by the light receiving elements 61 to 63.

  The power control unit 15 of the signal control device 1 according to this example also executes the processing shown in FIG. In addition, the power control unit 15 of the signal control device 1 according to this example monitors whether or not the brightness of the signal lights 51 to 53 at the time of lighting is appropriate, and when determining that the brightness is incorrect, the power control unit 15 determines that Update the duty ratio.

  FIG. 6 is a flowchart showing the dimming parameter update processing. The power control unit 15 determines whether or not the lighting brightness of the signal lamp 51 is appropriate at the lighting start timing of the green signal (s11, s12).

  The brightness detection unit 22 samples the brightness signal output from the light receiving element 61, which is input to the brightness signal input unit 21, and detects the lighting brightness of the signal lamp 51. The brightness detection unit 22 inputs the detected lighting brightness of the signal lamp 51 to the power control unit 15. The power control unit 15 compares the set brightness of the blue signal of the dimming pattern instructed at that time with the lighting brightness of the signal lamp 51 input from the brightness detection unit 22, and the absolute value of the difference is a predetermined amount. If it exceeds, it is determined that the lighting brightness of the signal lamp 51 is not appropriate. In other words, the power control unit 15 determines that the absolute value of the difference between the set brightness of the blue signal of the dimming pattern instructed at that time and the lighting brightness of the signal lamp 51 input from the brightness detection unit 22 exceeds the predetermined amount. If not, it is determined that the lighting brightness of the signal lamp 51 is appropriate. This predetermined amount may be, for example, 5% of the set brightness of the blue signal of the dimming pattern instructed at that time.

  When determining that the lighting brightness of the signal lamp 51 is not appropriate in s12, the power control unit 15 updates the duty ratio of the blue signal of the dimming pattern instructed at that time (s13), and returns to s11. In s13, if the set brightness of the blue signal of the dimming pattern instructed at that time is higher than the lighting brightness of the signal lamp 51 input from the brightness detection unit 22, the blue signal of the dimming pattern instructed at that time is obtained. The duty ratio of is increased by Δt. On the other hand, if the set brightness of the blue signal of the dimming pattern instructed at that time is smaller than the lighting brightness of the signal lamp 51 input from the brightness detection unit 22, the green signal of the dimming pattern of the instructed dimming pattern at that time is obtained. The duty ratio is reduced by Δt. In s13, not only the dimming parameter (duty ratio) of the traffic light 50 of the corresponding type stored in the storage unit 14, but also the duty ratio of the blue signal read and updated and stored in the memory in s2 is updated.

  Further, at the yellow signal lighting start timing, the power control unit 15 determines whether the lighting brightness of the signal lamp 52 is appropriate (s14, s15).

  The brightness detection unit 22 samples the brightness signal output from the light receiving element 62, which is input to the brightness signal input unit 21, and detects the lighting brightness of the signal lamp 52. The brightness detection unit 22 inputs the detected lighting brightness of the signal lamp 52 to the power control unit 15. The power control unit 15 compares the set brightness of the yellow signal of the dimming pattern instructed at that time with the lighting brightness of the signal lamp 52 input from the brightness detection unit 22, and the absolute value of the difference is determined. If it exceeds the fixed amount, it is determined that the lighting brightness of the signal lamp 52 is not appropriate. In other words, the power control unit 15 determines that the absolute value of the difference between the set brightness of the yellow signal of the dimming pattern instructed at that time and the lighting brightness of the signal lamp 52 input from the brightness detection unit 22 is a predetermined amount. If it does not exceed, it is determined that the lighting brightness of the signal lamp 52 is appropriate. This predetermined amount may be, for example, 5% of the set brightness of the yellow signal of the dimming pattern instructed at that time.

  When determining that the lighting brightness of the signal lamp 52 is not appropriate in s15, the power control unit 15 updates the duty ratio of the yellow signal of the dimming pattern instructed at that time (s16), and returns to s11. In s16, if the set brightness of the yellow signal of the dimming pattern instructed at that time is higher than the lighting brightness of the signal lamp 52 input from the brightness detection unit 22, the dimming pattern instructed at that time is determined. The duty ratio of the yellow signal is increased by Δt. On the other hand, if the set brightness of the yellow signal of the dimming pattern instructed at that time is smaller than the lighting brightness of the signal lamp 52 input from the brightness detection unit 22, the yellow brightness of the dimming pattern instructed at that time is obtained. The duty ratio of the signal is reduced by Δt. In s16, not only the dimming parameter (duty ratio) of the traffic light 50 of the corresponding type stored in the storage unit 14, but also the duty ratio of the yellow signal read and updated and stored in the memory in s2 is updated.

  Further, the power control unit 15 determines whether or not the lighting brightness of the signal lamp 53 is appropriate at the lighting start timing of the red signal (s17, s18).

  The brightness detection unit 22 samples the brightness signal output from the light receiving element 63, which is input to the brightness signal input unit 21, and detects the lighting brightness of the signal lamp 53. The brightness detection unit 22 inputs the detected lighting brightness of the signal lamp 53 to the power control unit 15. The power control unit 15 compares the set brightness of the red signal of the dimming pattern instructed at that time with the lighting brightness of the signal lamp 53 input from the brightness detection unit 22, and the absolute value of the difference is determined. If it exceeds the fixed amount, it is determined that the lighting brightness of the signal lamp 53 is not appropriate. In other words, the power control unit 15 determines that the absolute value of the difference between the set brightness of the red signal of the dimming pattern instructed at that time and the lighting brightness of the signal lamp 53 input from the brightness detecting unit 22 is a predetermined amount. If it does not exceed, it is determined that the lighting brightness of the signal lamp 53 is appropriate. This predetermined amount may be, for example, 5% of the set brightness of the red signal of the dimming pattern instructed at that time.

  When determining that the lighting brightness of the signal lamp 53 is not appropriate in s18, the power control unit 15 updates the duty ratio of the red signal of the dimming pattern instructed at that time (s19), and returns to s11. In s19, if the set brightness of the red signal of the dimming pattern instructed at that time is higher than the lighting brightness of the signal lamp 53 input from the brightness detection unit 22, the dimming pattern instructed at that time is determined. The duty ratio of the red signal is increased by Δt. On the other hand, if the set brightness of the yellow signal of the dimming pattern instructed at that time is smaller than the lighting brightness of the signal lamp 53 input from the brightness detection unit 22, the red of the dimming pattern instructed at that time is red. The duty ratio of the signal is reduced by Δt. In s19, not only the dimming parameter (duty ratio) of the traffic light 50 of the corresponding type stored in the storage unit 14, but also the duty ratio of the red signal read out and updated and stored in the memory in s2 is updated.

  As described above, the signal control device 1 according to this example detects the lighting brightness for each of the signal lights 51 to 53 of the traffic light 50, and if the brightness is not appropriate, updates the duty ratio of the corresponding dimming parameter. Therefore, the signal control device 1 according to this example can cope with individual differences of the traffic light 50, deterioration of the signal lights 51 to 53, and the like.

  In addition, the signal control device 1 is configured to determine whether the lighting brightness is appropriate at the lighting start timing of the signal lights 51 to 53, and if not, update the duty ratio of the corresponding dimming parameter. The lighting brightness does not change many times during the period from the turning on of the signal lights 51 to 53 until the turning off. Further, the timing for updating the duty ratio of the corresponding dimming parameter may be set after the signal lamps 51 to 53 are turned off.

  The signal control device 1 repeats the processing of s12 and s13 during the lighting of the signal lamp 51, the processing of s15 and s16 during the lighting of the signal lamp 52, and the processing of s18 and s19 during the lighting of the signal lamp 53. May be repeated.

DESCRIPTION OF SYMBOLS 1... Signal control device 11... Oscillation part 12... Frequency division part 13... Setting part 14... Storage part 15... Power control part 16... Power supply part 21... Luminance signal input part 22... Luminance detection part 50... Traffic signals 51-53... Signal lamps 54 to 56... Lighting circuits 61 to 63... Light receiving element

Claims (5)

A type setting part that sets the type of traffic signal,
With respect to the connected traffic light, a power supply unit that supplies electric power for turning on the traffic light by the traffic light,
A storage unit that stores, for each type of traffic light, a dimming parameter that controls the magnitude of the power supplied to the traffic light by the power supply unit to a size at which the traffic light of the traffic light is turned on with a set brightness.
With the dimming parameter according to the type of traffic light set in the type setting unit, a power control unit for controlling the magnitude of the power supplied to the traffic light by the power supply unit ,
The storage unit, for a plurality of the set brightness, for each of the set brightness, a dimming pattern in which the dimming parameter is associated is stored for each type of traffic light,
The power control unit is the type of traffic light set in the type setting unit, and the dimming parameter according to the dimming pattern instructed from an external device, of the power supplied to the traffic light by the power supply unit. A signal control device that controls the size .   The signal control device according to claim 1, wherein the storage unit stores the dimming parameter for each color of the signal light.   The signal control device according to claim 1, wherein the dimming parameter is a duty ratio used for phase modulation control of a commercial power supply that is an input of the power supply unit. A brightness input unit to which the lighting brightness of the signal lamp is input,
The power control unit compares the lighting brightness of the signal lamp input to the brightness input unit with the set brightness, and updates the dimming parameter stored in the storage unit based on a comparison result, The signal control device according to any one of 1 to 3.   The signal control device according to claim 4, further comprising a brightness measuring unit that measures a lighting brightness of the signal lamp and inputs the measured brightness to the brightness input unit.

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