JP2008071175A - Lamp driving device, lamp driving system, and traffic signal control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp driving device, a lamp driving system and a traffic signal control system, capable of ensuring safe passage of a vehicle or a pedestrian by preventing full extinguishment of signal lamps by a disaster. <P>SOLUTION: An instruction signal determination part 202 outputs an abnormality detection signal to a switching part 203 when it determines that a lamp output instruction outputted from a traffic signal controller is abnormal. The switching part 203 outputs a start signal to a timer circuit 204 to start the timer circuit 204, acquires an emergency drive signal generated by the timer circuit 204, and outputs the acquired emergency drive signal to a semiconductor relay 209 corresponding to the read lamp or yellow lamp of a signal lamp. The emergency drive signal is outputted to the semiconductor relay 209 corresponding to the yellow lamp when an SSU 200 drives a main road-side signal lamp, and outputted to the semiconductor relay 209 corresponding to the red lamp when the SSU drives a driven road-side signal lamp. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lamp drive device that drives a signal lamp device, a lamp drive system including the lamp drive device, and a traffic signal control system based on a control signal for controlling lighting or extinguishing of the signal lamp device.

  At intersections and pedestrian crossings, multiple signal lamps are installed at predetermined positions to ensure safe traffic for vehicles, pedestrians, etc., and the blue, yellow, red, blue arrows, etc. of each signal lamp are turned on and off Alternatively, a traffic signal control system for controlling blinking or the like to repeat at predetermined time intervals has already been put into practical use, and technical development related to the traffic signal control system has been performed in accordance with recent technological progress.

  Such a traffic signal control system is composed of a plurality of signal lamps, a traffic signal controller equipped with a control unit and an SSU (solid state relay unit, lamp drive unit), etc. The control unit of the traffic signal controller, based on the command output from the central device installed in the traffic signal controller to the traffic signal controller and the predetermined information held by the traffic signal controller, And output a lamp output command to the SSU. The SSU outputs a signal lamp drive signal to the signal lamp based on the lamp output command.

  FIG. 7 is a schematic diagram showing an example of the configuration of a conventional traffic signal control system, FIG. 8 is a block diagram showing the configuration of a conventional SSU 510, and FIG. 9 is a block diagram showing the configuration of a conventional signal lamp 10. is there. The conventional traffic signal control system is, for example, a traffic signal controller 500 that controls lighting, extinguishing, blinking, etc. of the signal lamps 10 installed on pillars installed at predetermined positions at intersections. Etc. For example, the traffic signal controller 500 is installed in the vicinity of one of the pillars on which the signal lamps 10 are installed, and is connected to the commercial power source 1 (for example, AC 100 V), and the signal lamps 10 are turned on and off. Or a control unit 501 for outputting a lamp output command for performing control such as blinking, a communication unit 502 for performing communication with the outside (for example, a central device installed in a traffic control center or the like), An interface unit 503 that outputs a lamp output command to each SSU 510, a power supply unit 504 for supplying a required DC voltage therein, an SSU 510 corresponding to each signal lamp 10, and the like are provided. Note that the communication unit 502 may not be mounted on a traffic signal controller of a type that operates alone.

  The SSU 510 includes semiconductor relays 513, 513, and 513 for turning on / off the AC 100V supplied from the commercial power source 1. Each of the semiconductor relays 513 is based on the lamp output command acquired by the interface unit 511. The AC100V supplied to each color LED is turned on / off corresponding to each of the ten red lamps (red LED), blue lamp (blue LED), and yellow lamp (yellow LED). Thereby, a lamp drive signal (AC drive signal) is output from each SSU 510 through the drive line 5. The voltage detection unit 512 detects the presence or absence of AC100V supplied to each of the red light (red LED), the blue light (blue LED), and the yellow light (yellow LED) of the signal lamp 10, and the detection result is obtained from the interface unit 511. To the control unit 501.

  The signal lamp 10 corresponds to the red LED 11, the blue LED 12, the yellow LED 13, and the LEDs 11, 12, and 13, a full-wave rectifier circuit 15 that performs full-wave rectification of the AC 100V supplied from the SSU 510, and the LEDs 11, 12, 13. Are provided with limiting resistors 14 for limiting the full-wave rectified voltage. In addition, LED11,12,13 is comprised by required number LED by connecting the LED group in which several LED was connected in series as an example. Note that the signal lamp 10 may include an incandescent lamp instead of the LEDs 11, 12, and 13. In this case, the full-wave rectifier circuit 15,..., The limiting resistor 14,.

In addition, when the traffic signal system must be installed in a mountainous area away from the commercial power supply area, it is equipped with a solar cell and a power storage unit. A highly reliable power supply independent traffic signal system that does not require external power supply by suppressing the luminance of the signal lamp according to the stored power of the battery and the generated power of the solar cell has also been proposed (Patent Literature) 1).
JP 2006-146295 A

  In the traffic signal system of Patent Document 1, a traffic signal system with high reliability can be provided in an area where commercial power is not supplied, but traffic is supplied to commercial power supply areas such as urban areas, urban areas, and suburbs. When installing a signaling system, power supply from a commercial power source is presupposed, and a conventional traffic signal control system has been used rather than a self-supporting traffic signal system.

  However, in the conventional traffic signal control system, if the traffic signal controller is in a state where it cannot operate normally due to a lightning strike, earthquake, storm or flood disaster, or the traffic signal controller is operating normally. In the event of a disconnection of the drive line between the signal lamp and the traffic signal controller, the drive signal is not output to the signal lamp and the signal lamp is completely extinguished, and safe passage of vehicles or pedestrians is prevented. There was a problem that it was not secured.

  The present invention has been made in view of such circumstances, and it is possible to prevent a signal light device from being completely extinguished by a disaster such as a lightning strike, an earthquake, a storm and flood damage, and to ensure safe passage of a vehicle or a pedestrian. An object of the present invention is to provide a lamp driving device that can be used, a lamp driving system including the lamp driving device, and a traffic signal control system.

  The lamp driving device according to the first aspect of the present invention is the lamp driving device for driving the signal lamp based on the control signal output by the traffic signal controller to control the lighting or extinguishing of the signal lamp. Receiving means for receiving a control signal from the machine, determining means for determining normality / abnormality of the control signal, and emergency control for controlling the signal lamp when the determining means determines that the control signal is abnormal And a generating means for generating a signal, arranged separately from the traffic signal controller, and configured to drive a signal lamp unit based on an emergency control signal generated by the generating means. To do.

  According to a second aspect of the present invention, there is provided the lamp drive device according to the first aspect, wherein the generating means generates an emergency control signal to turn on a red lamp, blink a red lamp or blink a yellow lamp of a signal lamp. It is configured.

  The lamp driving device according to a third aspect of the present invention is the first or second aspect of the invention, in which the means for determining whether or not the abnormality of the control signal has been eliminated, and the emergency control signal when the abnormality of the control signal is eliminated Means for stopping the generation of the signal lamp, and the signal lamp device is driven based on the control signal.

  The lamp drive device according to a fourth aspect of the present invention is configured to be connected to an AC power source in any one of the first to third aspects of the invention, and a detection unit that detects interruption of the AC power source and an AC power source And an output unit that outputs electric power obtained from the secondary battery to the signal lamp device when cut off.

  According to a fifth aspect of the present invention, there is provided the lamp driving device according to the fourth aspect, further comprising a charging unit that charges the secondary battery based on the electric power generated by the solar battery.

  A lamp driving system according to a sixth aspect of the invention includes one or a plurality of signal lamps and the lamp driving device according to any of the above-described inventions.

  A traffic signal control system according to a seventh aspect is characterized by comprising a plurality of signal lamps, a traffic signal controller, and the lamp driving device according to any one of the aforementioned inventions.

  In the first aspect of the invention, the control signal is configured so as to be spaced apart from the traffic signal controller, and the control signal for controlling lighting or extinguishing (including blinking) of the signal lamp from the traffic signal controller. (Lamp output command) is received. The determination means determines whether the control signal is normal or abnormal (for example, when the control signal cannot be received for a predetermined time or when the received control signal is not normal). When it is determined that the control signal is abnormal, an emergency control signal for controlling the signal lamp is generated by the generation means, and the generated emergency control signal is used instead of the control signal received from the traffic signal controller. Based on this, the signal lamp is driven. As a result, for example, when the traffic signal controller cannot operate normally due to a disaster such as lightning, earthquake, storm and flood damage, etc., and the control signal (lamp output command) cannot be output, or the control signal is sent to the lamp When transmission to the drive unit is not possible, the lamp drive unit placed away from the traffic signal controller is self-supporting and generates an emergency control signal (emergency lamp output command). Based on the generated emergency control signal Since the lamp drive signal is output, the signal lamp can be prevented from being completely extinguished, and the situation where the vehicle or pedestrian cannot pass safely due to the signal lamp having been extinguished can be avoided. it can. In addition, the lamp drive device can be arranged away from the traffic signal controller, and when the lamp drive device is installed near the signal lamp device, the drive line with the signal lamp device must be much shorter than before. Thus, the influence of disconnection of the drive line due to a disaster or the like can be minimized.

  In the second invention, the generating means generates the emergency control signal to turn on the red lamp of the signal lamp, flash the red lamp, or flash the yellow lamp. For example, when the lamp driving device drives a signal lamp on the main road (main road) side, an emergency control signal is generated to blink a yellow lamp. Further, when the lamp driving device drives a signal lamp on the secondary road (non-main road) side, an emergency control signal is generated so as to blink the red lamp. Further, an emergency control signal is generated to turn on the red lamp according to the road condition. As a result, the signal lamp can be prevented from being completely extinguished, flashing can be displayed, the priority of traffic between roads intersecting at an intersection can be clarified, and the presence of the signal lamp can be easily visually confirmed. It is possible to avoid dangers such as overlooking traffic signals and collisions between vehicles. Especially at night, safety can be further improved.

  In the third invention, it is determined whether or not the abnormality of the control signal has been eliminated. When the abnormality of the control signal is eliminated, the generation of the emergency control signal is stopped. The control signal transmitted from the traffic signal controller is received, and the signal lamp is driven based on the received control signal. As a result, even if the traffic signal controller does not operate normally due to a disaster, etc., when it returns to normal operation, it will promptly display the red, blue, and yellow lights from the flash display to the regular timing. It is possible to ensure the safety of traffic of vehicles or pedestrians.

  In the fourth invention, when the interruption of the AC power supply is detected by the detection unit, the output unit outputs the power obtained from the secondary battery to the signal lamp. As a result, for example, even when the AC power supply becomes unusable due to a disaster such as a lightning strike, earthquake, storm and flood damage, etc., the driving of the signal lamp can be continued and the traffic safety of the vehicle or pedestrian can be ensured. it can.

  In the fifth invention, the charging unit charges the secondary battery based on the power generated by the solar battery. As a result, even when the AC power supply is shut off, when the power can be generated by the solar battery, the secondary battery can be continuously charged and the operation time of the secondary battery can be extended. .

  In the sixth invention, the lamp driving system includes the lamp driving device. Thereby, the invention of the lamp driving device described above can be applied to the lamp driving system.

  In the seventh invention, the traffic signal control system includes a lamp drive device. As a result, the invention of the lamp driving device described above can be applied to a traffic signal control system.

  In the present invention, it is possible to prevent the signal lamp from being completely extinguished due to a disaster such as a lightning strike, earthquake, storm and flood damage, and to ensure safe passage of a vehicle or a pedestrian.

Embodiment 1
Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic diagram showing an example of the configuration of a traffic signal control system according to the present invention. The traffic signal control system of the present invention includes, for example, signal lights 10 installed on pillars (not shown) installed at predetermined positions at four corners of a crossing intersection constituted by four traffic paths,. SSU (solid state relay unit, SSR unit) 200 installed in the vicinity,..., A traffic signal controller 100 for controlling the lighting, extinguishing, or blinking of each signal lamp 10.

  The installation location of each SSU 200 is arranged away from the traffic signal controller 100 and is in the vicinity of the signal lamp device 10 to be driven. This is, for example, in the vicinity of a column where the signal lamp device 10 to be driven is installed, It may be provided at the bottom of the column, inside the column, and the like. Further, it may be provided adjacent to the signal lamp 10 or may be provided so as to be built in the signal lamp 10.

  The traffic signal controller 100 is installed, for example, in the vicinity of one of the columns on which the signal lamp 10 is installed, and includes a control unit 101, a communication unit 102, a power supply unit 103, an interface unit 104, and the like. The traffic signal controller 100 is connected to a commercial power source 1 (for example, AC 100V) and is connected to each SSU 200 through a signal line 6 for performing information communication in a parallel interface method or a serial interface method. Yes.

  The power supply unit 103 is configured by a rectifier circuit, or a rectifier circuit and a constant voltage circuit, etc., to convert AC100V supplied from the commercial power supply 1 into a predetermined DC voltage so that each unit in the traffic signal controller 100 operates. Supply the required DC voltage as required. The communication unit 102 has a communication interface function for transmitting / receiving information to / from the outside (for example, a traffic control device, a central device, etc.). For example, the traffic signal controller 100 receives a command plan (command) related to traffic signal control from a central device (not shown) installed in a traffic control center or the like, and each signal lamp acquired by the traffic signal controller 100. Signal control execution information including information related to the time when 10 is turned on / off is transmitted to the central unit.

  The control unit 101 controls the operation of the traffic signal controller 100 as a whole and sends a control signal (lamp output command) for controlling lighting, extinction, blinking, etc. of each signal lamp 10 via the interface unit 104. Output to each SSU 200. Each SSU 200 is connected with commercial power supplies 2a, 2b, 2c, and 2d (AC power supplies) that can be connected at the four corners of the intersection. The commercial power sources 2a, 2b, 2c, and 2d may be the same system commercial power source that is distributed from the same transformer, or may be a different system commercial power source, and are appropriately determined according to the installation location of the SSU 200. can do.

  FIG. 2 is a block diagram illustrating an example of the configuration of the SSU 200. The SSU 200 includes an interface unit 201, a command signal determination unit 202, a switching unit 203, a timer circuit 204, a voltage detection unit 205, a battery 206, a DC / AC conversion circuit 207, a power control unit 208, a semiconductor relay 209,. Yes.

  The interface unit 201 receives a control signal (lamp output command) output from the traffic signal controller 100, generates a drive signal for driving the signal lamp 10 based on the received control signal, and switches the switching unit 203. Output to. Further, the interface unit 201 receives a lamp state signal output from a voltage detection unit 205 described later, and outputs the received lamp state signal to the traffic signal controller 100. For example, the traffic signal controller 100 monitors the lamp state signal input from the interface unit 201 in order to prevent the two lamps 10 and 10 from simultaneously turning on the blue lamp. The interface unit 201 may be a parallel interface method or a serial interface method. In order to reduce the number of signal lines between the traffic signal controller 100 and the SSU 200, the serial interface method is desirable.

  The command signal determination unit 202 determines whether the control signal (lamp output command) output from the traffic signal controller 100 is a normal signal or whether the control signal is received during a predetermined time. The normal / abnormal of the control signal is determined. When it is determined that the control signal is abnormal, the command signal determination unit 202 outputs a determination signal (abnormality detection signal) to the switching unit 203. When there is no abnormality in the control signal, the command signal determination unit 202 outputs a determination signal (normal detection signal) to the switching unit 203. In addition, the command signal determination unit 202 determines whether or not the lamp state signal output from the voltage detection unit 205 is abnormal. If there is an abnormality, the command signal determination unit 202 similarly switches the determination signal (abnormality detection signal) to the switching unit 203. Output to.

  When the command signal determination unit 202 outputs a normal detection signal, the switching unit 203 outputs the drive signal input from the interface unit 201 to the semiconductor relays 209. In addition, when an abnormality detection signal is output from the command signal determination unit 202, the switching unit 203 outputs an activation signal to the timer circuit 204 to activate the timer circuit 204, and the emergency drive signal generated by the timer circuit 204 ( Emergency lamp output command) is obtained, and the obtained emergency drive signal is output to the semiconductor relays 209,.

  When the activation signal is input from the switching unit 203, the timer circuit 204 generates an emergency drive signal and outputs it to the switching unit 203. The emergency drive signal is, for example, an on / off signal with a period of 0.5 seconds, and is output to any one of the semiconductor relays 209 and 209 corresponding to the red lamp or the yellow lamp of the signal lamp device 10.

  For example, when the SSU 200 drives the signal lamp 10 on the main road (main road) side, the emergency drive signal is output to the semiconductor relay 209 corresponding to the yellow lamp. Further, when the SSU 200 drives the signal lamp 10 on the secondary road (non-main road) side, the emergency drive signal is output to the semiconductor relay 209 corresponding to the red lamp. As a result, the signal lamp 10 is flashed. Note that the flashing display is an intersection where the amount of traffic passing through the intersection is small and the optimum cycle is extremely short, or an inflow route where the traffic volume is extremely small, and there is a large loss to give one indication to the inflow route. In such a case, a yellow light or a red light blinks on the display to process the traffic. Depending on the road conditions, the emergency drive signal may be an ON signal so as to continue lighting the red lamp of the signal lamp 10.

  The DC / AC conversion circuit 207 converts the direct current supplied from the battery 206 into alternating current (AC100V) when the cutoff signal of the commercial power supply 2a is input from the power supply control unit 208, and converts the converted AC100V into the power supply control unit 208. Output to.

  The power supply control unit 208 outputs AC100V input from the commercial power supply 2a to the semiconductor relays 209,. In addition, the power supply control unit 208 determines whether or not the commercial power supply 2a is cut off. If the commercial power supply 2a is cut off, the power supply control unit 208 outputs a cut-off signal to the DC / AC conversion circuit 207 to each semiconductor relay 209. Is switched from the commercial power source 2a to the battery 206.

  Each semiconductor relay 209 is for turning on / off the AC 100 V supplied from the commercial power supply 2 a or the AC 100 V supplied from the DC / AC conversion circuit 207. Each semiconductor relay 209 corresponds to each of the red light (red LED), blue light (blue LED), and yellow light (yellow LED) of the signal lamp 10 based on the drive signal input from the switching unit 203. An AC drive signal is output to the signal lamp 10 by turning on / off the AC 100V supplied to the LED.

  The voltage detection unit 205 detects the presence or absence of AC100V supplied to each of the red lamp (red LED), blue lamp (blue LED), and yellow lamp (yellow LED) of the signal lamp 10, and the detection result (lamp status signal) Is output to the interface unit 201 and the command signal determination unit 202. Note that the voltage detected by the voltage detection unit 205 may be configured to detect only the presence or absence of AC 100 V supplied to the blue lamp.

  As the battery 206, for example, a secondary battery such as a lead storage battery, a lithium ion battery, a nickel cadmium battery, or a nickel metal hydride battery can be used. The battery 206 may be built in the SSU 200 or may be provided outside the SSU 200.

  The configuration of the signal lamp 10 is the same as that described with reference to FIG.

  FIG. 3 is an explanatory diagram showing an example of the control signal. As shown in FIG. 3A, the control signal (lamp output command) is expressed in a data format including a header portion, a data portion, a footer portion, and the like. The header portion stores, for example, information indicating the start of the control signal, and the footer portion stores, for example, information indicating the end of the control signal. As shown in FIG. 3B, in the data portion, for example, each command content is specified by a 4-bit bit string. For example, when the bit string is “0001”, it indicates a blue output command of the vehicle signal lamp, when the bit string is “0010”, it indicates the yellow output command of the vehicle signal lamp, and when the bit string is “0011” The red output command of the vehicle signal lamp is shown. The data format of the control signal is an example and is not limited to this.

  Next, the operation of the SSU 200 of the present invention will be described. The command signal determination unit 202 determines whether the lamp output command (control signal) output from the traffic signal controller 100 is a normal signal, or whether the lamp output command is received during a predetermined time. Thus, it is determined whether or not the traffic signal controller 100 is disabled.

  When there is no abnormality in the lamp output command, the interface unit 201 generates a drive signal based on the received lamp output command, and outputs the drive signal generated through the switching unit 203 to each semiconductor relay 209. An AC drive signal is output to the signal lamp 10.

  When the command signal determination unit 202 determines that there is an abnormality in the lamp output command (that is, when it is determined that some trouble has occurred on the traffic signal controller 100 side), in order to prevent the signal lamp device 10 from being completely extinguished. The abnormality detection signal is output to the switching unit 203.

  The switching unit 203 outputs a start signal to the timer circuit 204 to start the timer circuit 204, acquires the emergency drive signal generated by the timer circuit 204, and uses the acquired emergency drive signal as a red light or a signal lamp 10 Output to any one of the semiconductor relays 209 and 209 corresponding to the yellow light. Accordingly, when the SSU 200 drives the signal lamp 10 on the main road (main road) side, the emergency drive signal is output to the semiconductor relay 209 corresponding to the yellow lamp. Further, when the SSU 200 drives the signal lamp 10 on the secondary road (non-main road) side, the emergency drive signal is output to the semiconductor relay 209 corresponding to the red lamp.

  When the traffic signal controller 100 is faulty and the commercial power source 2a is also interrupted, the power control unit 208 switches the power supply to the semiconductor relay 209 from the commercial power source 2a to the battery 206.

  When the failure of the traffic signal controller 100 is resolved, when the command signal determination unit 202 determines that the lamp output command output by the traffic signal controller 100 is normal, the interface unit 201 receives the received lamp A drive signal is generated based on the output command, and the drive signal generated through the switching unit 203 is output to each semiconductor relay 209, whereby the AC drive signal is output to the signal lamp 10.

  As described above, in the present invention, for example, the traffic signal controller 100 falls into a state where it cannot operate normally due to a disaster such as a lightning strike, earthquake, storm and flood damage, and the control signal (lamp output command) is output. Or when the control signal cannot be transmitted to the SSU 200, the SSU 200 arranged separately from the traffic signal controller 100 generates an emergency drive signal (emergency lamp output command) by itself. Since the signal lamp 10 is driven in response to the emergency drive signal, the signal lamp 10 can be prevented from being completely extinguished, and the vehicle or pedestrian can pass safely by the signal lamp 10 being extinct. The situation of disappearing can be avoided. In addition, the SSU 200 can be arranged away from the traffic signal controller 100, and when the SSU 200 is installed in the vicinity of the signal lamp 10, the drive line with the signal lamp 10 can be made extremely shorter than before, The influence of disconnection of the drive line due to a disaster or the like can be minimized.

  Further, when the SSU 200 drives the signal lamp 10 on the main road (main road) side, an emergency drive signal is generated so that the yellow lamp blinks, and the SSU 200 changes the signal lamp 10 on the secondary road (non-main road) side. When driving, an emergency drive signal is generated to cause the red light to blink, so that the signal lamp 10 is prevented from being completely extinguished, and a flashing display is possible, giving priority to traffic between roads intersecting at an intersection. The order becomes clear and the presence of the signal lamp 10 can be easily recognized, thereby avoiding dangers such as missed traffic signals and collision accidents between vehicles. Especially at night, safety can be further improved.

  Even when the traffic signal controller 100 does not operate normally due to a disaster or the like, when the traffic signal controller 100 returns to normal operation, the signal lamp 10 is quickly switched from flashing to red, blue, and yellow lights at regular timing. It can be set as a display, and the traffic safety of a vehicle or a pedestrian can be ensured. Further, when the interruption of the commercial power source 2a is detected, the power obtained from the battery 206 is output to the signal lamp 10, so that, for example, the commercial power source 2a becomes unusable due to a disaster such as a lightning strike, earthquake, storm and flood damage, etc. However, the driving of the signal lamp device 10 can be continued, and the safety of passage of the vehicle or pedestrian can be ensured.

Embodiment 2
In the first embodiment, each SSU 200 is configured to drive the signal lamp 10 by turning on / off the AC 100V. However, the present invention is not limited to this. For example, the signal lamp includes an LED instead of an incandescent lamp. Alternatively, the signal lamp can be driven by turning on / off a low-voltage (for example, several tens of volts) DC voltage suitable for driving the LED instead of AC 100V.

  FIG. 4 is a block diagram showing the configuration of the SSU 220 according to the second embodiment. The SSU 220 includes an interface unit 201, a command signal determination unit 202, a switching unit 203, a timer circuit 204, a voltage detection unit 225, a battery 206, a power supply control unit 228, an AC / DC conversion circuit 221, a semiconductor relay 229,. Yes.

  The difference from the SSU 200 is that the DC / AC conversion circuit 207 is not provided, but the AC / DC conversion circuit 221 is provided instead, the power control unit 228 is different, and the semiconductor relay 229 is a type that turns on / off direct current. The voltage detection unit 225 detects a DC voltage. Hereinafter, differences will be described.

  The AC / DC conversion circuit 221 includes a rectifier circuit or a rectifier circuit and a constant voltage circuit. The AC (AC 100 V) supplied from the commercial power supply 2a is a red LED and a blue LED of a signal lamp 20 (see FIG. 5) described later. The LED and the yellow LED are converted into direct current of a predetermined voltage (for example, 12 V), and the converted direct current (DC voltage) is output to the power supply control unit 228.

  The power supply control unit 228 outputs the direct current input from the AC / DC conversion circuit 221 to the semiconductor relays 229. Further, the power supply control unit 228 determines whether or not the commercial power supply 2a is cut off. If it is determined that the commercial power supply 2a is cut off, the AC / DC conversion circuit 221 (commercial power supply 2a) supplies power to each semiconductor relay 229. To the battery 206. The power supply control unit 228 can also have a function of converting a voltage output from the battery 206 into a predetermined voltage.

  Each semiconductor relay 229 is for turning on / off a DC voltage supplied from the AC / DC conversion circuit 221 or the battery 206. Each semiconductor relay 229 is based on the drive signal input from the switching unit 203, corresponding to each of the red light (red LED), blue light (blue LED), and yellow light (yellow LED) of the signal lamp 20. A DC drive signal is output to the signal lamp 20 by turning on / off the DC voltage supplied to the LED.

  The voltage detector 225 detects the presence or absence of a DC voltage supplied to each of the red lamp (red LED), the blue lamp (blue LED), and the yellow lamp (yellow LED) of the signal lamp 20, and the detection result (lamp status signal) ) Is output to the interface unit 201 and the command signal determination unit 202. The voltage detected by the voltage detector 225 may be configured to detect only the presence or absence of a DC voltage supplied to the blue lamp. Since other parts are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  FIG. 5 is a block diagram illustrating a configuration of the signal lamp device 20 according to the second embodiment. The signal lamp 20 includes a red LED 21, a blue LED 22, a yellow LED 23, and the like, and is configured to be directly applied with a DC voltage (for example, 12 V) supplied from the SSU 220. In addition, each LED21,22,23 is comprised by required number LED by connecting the LED group in which several LED was connected in series by multiple parallel.

Embodiment 3
In the first and second embodiments, the AC power source is connected to the SSU 200 and the SSU 220. However, both the AC power source and the solar cell may be connected.

  FIG. 6 is a block diagram illustrating a configuration of the SSU 240 according to the third embodiment. The SSU 240 includes an interface unit 201, a command signal determination unit 202, a switching unit 203, a timer circuit 204, a voltage detection unit 225, a battery 206, a power supply control unit 228, an AC / DC conversion circuit 221, a semiconductor relay 229,. A conversion circuit 241 and the like are provided.

  A difference from the SSU 220 is that a DC / DC conversion circuit 241 is provided. The DC / DC conversion circuit 241 converts the electric power generated by the solar cell 3 into a predetermined DC voltage and outputs it to the power control unit 228. The power supply control unit 228 charges the battery 206 with the DC voltage converted by the DC / DC conversion circuit 241. Since other parts are the same as those of the second embodiment, the same reference numerals are given and description thereof is omitted.

  Thereby, even when the commercial power source 2a is cut off, when the solar cell 3 can generate electric power, the battery 206 can be continuously charged and the operation time of the battery 206 can be extended. .

  In the first to third embodiments described above, the SSU is provided in the vicinity of the signal lamp. However, the present invention is not limited to this. For example, the SSU is integrated into the signal lamp to drive the lamp. A system can also be configured. In this case, the components constituting the SSU can be mounted on the substrate, and the mounting substrate can be disposed in the signal lamp. Also, the components constituting the SSU are built in the housing, and the housing for housing the housing. By providing the unit in the signal lamp, the SSU can be incorporated in the signal lamp.

  Furthermore, the signal lamp unit and the SSU can each be configured by a casing, a connector for electrically connecting each casing can be provided, and the SSU and the signal lamp unit can be configured to be detachable. In this case, the SSU and the signal lamp can be locked with each other, and both can be mechanically fixed. Thereby, the separation dimension of SSU and a signal lamp device can be made still smaller. In addition, workability such as SSU attachment work and maintenance work can be improved.

  In the above-described first to third embodiments, four signal lamps are provided at the intersection. However, the number of signal lamps is not limited to this, and two vehicles are used instead of one for each traffic path. The signal light device may be provided. In addition, the signal lamp is not limited to a vehicle, and may be configured to include a pedestrian signal lamp. For example, in a crossing intersection, when two pedestrian signal lamps are provided for each pedestrian crossing, a total of eight pedestrian signal lamps are provided. Further, the configuration of the intersection is not limited to a cross intersection, and may be an intersection where three traffic paths intersect and an intersection where five traffic paths intersect.

  In Embodiments 1 to 3 described above, one signal lamp is driven by one SSU, but the present invention is not limited to this, and a plurality of signal lamps are driven by one SSU. There may be.

  In the above-described first to third embodiments, a semiconductor relay is used. However, the present invention is not limited to this, and a semiconductor switching element is used as long as it can control on / off of AC or DC. You can also. Further, an FET may be used to turn on / off direct current. In addition, this invention is not limited to an Example.

It is a schematic diagram which shows an example of a structure of the traffic signal control system which concerns on this invention. It is a block diagram which shows an example of a structure of SSU. It is explanatory drawing which shows an example of a control signal. 6 is a block diagram illustrating a configuration of an SSU of a second embodiment. FIG. It is a block diagram which shows the structure of the signal lamp device of Embodiment 2. FIG. FIG. 10 is a block diagram illustrating a configuration of an SSU according to a third embodiment. It is a schematic diagram which shows an example of a structure of the conventional traffic signal control system. It is a block diagram which shows the structure of the conventional SSU. It is a block diagram which shows the structure of the conventional signal lamp device.

Explanation of symbols

1, 2a, 2b, 2c, 2d Commercial power supply 3 Solar cell 6 Signal line 10, 20 Signal lamp 100 Traffic signal controller 101 Control unit 102 Communication unit 103 Power supply unit 104 Interface unit 200, 220, 240 SSU
DESCRIPTION OF SYMBOLS 201 Interface part 202 Command signal determination part 203 Switching part 204 Timer circuit 205, 225 Voltage detection part 206 Battery 207 DC / AC conversion circuit 208, 228 Power supply control part 209, 229 Semiconductor relay 221 AC / DC conversion circuit 241 DC / DC conversion circuit

Claims (7)

In the lamp driving device for driving the signal lamp based on the control signal output by the traffic signal controller to control the lighting or extinguishing of the signal lamp,
Receiving means for receiving a control signal from the traffic signal controller;
Determining means for determining normality / abnormality of the control signal;
A generating means for generating an emergency control signal for controlling the signal lamp when the control means determines that the control signal is abnormal;
A lamp driving device, wherein the lamp driving device is arranged so as to be spaced apart from the traffic signal controller and to drive a signal lamp based on an emergency control signal generated by the generating means.   2. The lamp according to claim 1, wherein the generation unit is configured to generate an emergency control signal to turn on a red light, blink a red light, or blink a yellow light of a signal lamp device. Device drive. Means for determining whether or not the abnormality of the control signal has been resolved;
Means for stopping the generation of the emergency control signal when the abnormality of the control signal is resolved,
The lamp driving device according to claim 1 or 2, wherein the signal lamp is driven based on a control signal. It is configured to be connected to an AC power source,
A detection unit for detecting the interruption of the AC power supply;
The lamp drive device according to any one of claims 1 to 3, further comprising: an output unit that outputs electric power obtained from the secondary battery to the signal lamp unit when the AC power supply is interrupted.   The lamp driving device according to claim 4, further comprising a charging unit that charges the secondary battery based on electric power generated by the solar battery.   A lamp driving system comprising one or a plurality of signal lamps and the lamp driving device according to any one of claims 1 to 5.   A traffic signal control system comprising a plurality of signal lamps, a traffic signal controller, and the lamp drive device according to any one of claims 1 to 5.

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