JPH0757185A - Traffic light and traffic light controller - Google Patents

Abstract

PURPOSE:To provide the traffic light which can send a signal regarding the number of passing vehicles by utilizing existent wiring facilities and also holds fail-safe performance. CONSTITUTION:Lamp terminals 11-13 receive electric power selectively from lines B1-B3 for lamp illumination. Signal lamps 21 and 23 make a signal display with the sent electric power. A power circuit 3 has input coils 311-313 connected to the lamp terminals 11-13. A vehicle detector 4 operates by being supplied with electric power from a power source E1 through an output coil 314 to detect the number of passing vehicles and outputs a vehicle detection signal S41. A transmitting circuit 5 operates by being supplied with electric power from the power source E1 through the output coil 314 to generate a frequency signal S51 corresponding to the number of passing vehicles on the basis of the vehicle detection signal S41 and an output circuit 52 is connected to the lamp terminals 12 or 13 to which an 'yellow' or 'red' signal lamp is connected so that the frequency signal S51 is sent through the lines B2 or B3 for lamp illumination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic signal and a traffic signal control device, and more specifically, it is possible to perform signal transmission relating to the number of passing vehicles by using an existing wiring facility (lighting device lighting line) for transmitting power to signal lights. The present invention relates to a technology that enables traffic signal control according to traffic volume.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing the configuration of a conventional traffic light control device. In the figure, A is a traffic light, and B1 to
B3 is a lamp lighting line, and C is a control circuit.

The traffic light A includes lamp terminals 11 to 14 and signal lights 21 to 23. Each of the lamp terminal 11 to 13 is separately connected to an independent lamp lighting line B1 to B3, and is selectively supplied with power from the lamp lighting line B1 to B3. The lamp terminal 14 is a common terminal and is connected to the lamp lighting line B4. Each of the signal lights 21 to 23 is individually connected to each of the lamp terminals 11 to 13 and performs signal display by the power supplied via the lamp lighting lines B1 to B3. The signal light 21 displays a "blue" signal, the signal light 22 displays a "yellow" signal,
The signal light 23 displays a "red" signal.

The control circuit C has a lamp drive circuit 6 and a display determination circuit 8. The lamp drive circuit 6 includes power supply terminals 611 to 614, an AC power supply 62, three-terminal control elements 631 to 633, and choke coils 641 to 643. The AC power supply 62, the three-terminal control element 631 and the choke coil 641 are connected in series, and both ends of the series circuit are connected to the power supply terminals 611 and 614. The three-terminal control element 631 conducts when the "blue" lighting command signal S61 is input, and supplies power to the power supply terminal 611 to drive the "blue" signal lamp 21. AC power supply 6
The two- and three-terminal control element 632 and the choke coil 642 are connected in series, and both ends of the series circuit are the power supply terminals 612,
614. The three-terminal control element 632 is
When the "yellow" lighting command signal S62 is input, it becomes conductive and supplies power for driving the "yellow" signal lamp 22 to the power supply terminal 612. AC power source 62, three-terminal control element 63
3 and the choke coil 643 are connected in series, and both ends of the series circuit are connected to the power supply terminals 613 and 614. The three-terminal control element 633 uses the "red" lighting command signal S
When 63 is input, it becomes conductive and supplies power for driving the "red" signal lamp 23 to the power supply terminal 613.
The choke coils 641 to 643 prevent inrush current from flowing through the signal lights 21 to 23.

FIG. 6 is a specific circuit diagram of the presentation determination circuit shown in FIG. The display determination circuit 8 is generally called a GGD unit, and outputs a check signal S8 for detecting that "blue" signals are simultaneously displayed in the intersecting traveling directions. Transformers 811 to 813 and rectifier circuits 821 to 82
3 and a logic judgment circuit 83. Transformer 81
The 1 and the rectifier circuit 821 form a 1-system (first direction) lighting detection circuit, and the input winding of the transformer 811 is connected to power supply terminals 611 and 614 that supply power to the “blue” signal lamp 21. The lighting of the “blue” signal lamp 21 is detected, and the rectification circuit 821 outputs the rectified voltage as the “blue” lighting detection signal S81. Similarly, the transformer 812 and the rectifier circuit 82
Reference numeral 2 constitutes a 2-system (second direction) lighting detection circuit, in which the input winding of the transformer 812 is connected to a power supply terminal for supplying power to a “blue” signal lamp (not shown). The lighting is detected, and the rectifier circuit 822 outputs the rectified voltage as a “blue” lighting detection signal S82. The transformer 813 and the rectifier circuit 823 constitute a lighting detection circuit of the 3rd system (third direction), and the transformer 813 is connected to a power supply terminal that supplies power to a “blue” signal lamp (not shown). Is detected, and the rectification circuit 823 outputs the rectified voltage as a “blue” lighting detection signal S83. The logic determination circuit 83 outputs the simultaneous indication determination signal S8 when two or more lighting detection signals S81 to S83 are input. Specifically, the AND circuit of the lighting detection signal S81 and the lighting detection signal S82, the lighting detection signal S82 and the lighting detection signal S8.
3 and an AND circuit for the lighting detection signal S83 and the lighting detection signal S81, and an OR circuit for taking an OR of these AND outputs. The simultaneous display determination signal S8 is transmitted to a signal control unit (not shown), prioritized by the signal control unit, and the lighting command signals S61 to S6.
It is fed back to the lamp drive circuit 6 as 63.

[0006]

However, the conventional traffic light control device cannot properly obtain information on traffic volume,
Since the signal lamp lighting time is controlled by the time control that predicts the traffic volume, the signal lamp lighting time cannot be controlled according to the traffic volume. In order to understand the traffic volume, it is essential to install a vehicle detector. Since the current wiring equipment (lighting equipment lighting line) is provided for power transmission to turn on the signal light, new wiring equipment is required to install the vehicle detector and perform signal transmission. No vehicle detector can be installed in the wiring facility.

Therefore, a first object of the present invention is to solve the above-mentioned problems and to provide a traffic signal which enables the signal transmission relating to the number of passing vehicles using the existing wiring equipment and can maintain the fail safe. Is to provide.

A second object of the present invention is to provide a traffic signal control device capable of controlling the signal lamp lighting time according to the number of passing vehicles.

[0009]

In order to solve the above-mentioned first problem, the first present invention provides a plurality of lamp terminals, a plurality of signal lamps, a power supply circuit, a vehicle detector, and a transmission circuit. A traffic signal including each of the lamp terminals, wherein each of the lamp terminals receives power transmission from a lamp lighting line, and the plurality of signal lamps include “blue”, “yellow”, and “red”. Signal lights, each of which is separately connected to each of the lamp terminals and performs signal display by the transmitted power, the power supply circuit includes a transformer, and the transformer includes a plurality of transformers. An input winding and an output winding, each of the input windings is separately connected to each of the lamp terminals, and the vehicle detector is connected to the output winding of the power supply circuit. It operates by being supplied with power and detecting the number of vehicles passing through The transmission circuit is operated as a power is supplied from the output winding of the power supply circuit, and has a signal generation circuit and an output circuit, and the signal generation circuit is the vehicle. A frequency signal corresponding to the number of detected vehicles is generated based on the detection signal, and the "yellow" or "red" signal lamp of the output circuit transmits the frequency signal through the lamp lighting line. It is connected to the connected lamp terminal.

In order to solve the second problem, the second invention is
A traffic light, a traffic light controller including a lamp lighting line, and a control circuit, wherein the traffic light is the one described above, the lamp lighting line is connected to the lamp terminal, Power is transmitted to the signal light, the control circuit,
A lamp driving circuit and a receiving circuit are included, and the lamp driving circuit includes a plurality of power supply terminals, an AC power supply, a plurality of three-terminal control elements, and a plurality of choke coils, and the AC A power supply, the three-terminal control element, and the choke coil are connected in series to form a plurality of series circuits, each of the series circuits is separately connected to each of the power supply terminals, and a lighting command signal is input. The three-terminal control element is conducted by the lighting command signal, the power supply terminal supplies the power to the lamp lighting line,
The reception circuit is coupled to the power supply terminal corresponding to the lamp lighting line to which the transmission circuit is connected, receives the frequency signal, decodes the frequency of the frequency signal, and outputs a passing vehicle number signal. To do.

[0011]

[Function] Each of the lamp terminals receives power from the lamp lighting line alternatively, and each of the signal lamps is connected to each of the lamp terminals separately, and signals are transmitted by the transmitted power. Since it is a display, "blue",
A traffic light is provided which can provide the appropriate signal indication of "yellow" and "red".

In the power supply circuit, the transformer has a plurality of input windings and an output winding, and since each of the input windings is connected to each of the lamp terminals separately, the lamp lighting line is connected. The power that is alternatively transmitted through the input winding is OR-coupled and the output winding provides a continuous power supply. Therefore, electric power can be obtained from the existing wiring equipment and used as the power source for the vehicle detector and the transmission circuit.

The vehicle detector operates by being supplied with power from the output winding of the power supply circuit, detects the number of passing vehicles, and outputs it as a vehicle detection signal, and the transmission circuit outputs the output winding of the power supply circuit. The power is supplied from the line to operate, the signal generation circuit generates a frequency signal according to the number of detected vehicles based on the vehicle detection signal, and the output circuit transmits the frequency signal through the lamp lighting line. Since it is connected to the lamp terminal, it enables signal transmission regarding the number of passing vehicles using the existing wiring equipment (lamp lighting line).

Since the output circuit is coupled to the lamp terminal to which the "yellow" or "red" signal lamp is connected, the output circuit fails and the "blue" signal lamp and the "yellow" or "red" signal lamp. Even if and are lit at the same time, the driver can judge that the traffic signal is broken by lighting the "yellow" or "red" signal light. In addition, since the signal display in the intersecting direction is not a "blue" signal display by the GGD unit, even if the driver believes that the "blue" signal light is displayed, no collision accident will occur. . As a result, it is possible to obtain a traffic signal that enables the signal transmission regarding the number of passing vehicles using the existing wiring equipment and can also maintain the fail safe.

The traffic light is the one described above, the lamp lighting line is connected to the lamp terminal and transmits power to the signal lamp, and the lamp driving circuit includes the AC power supply and the three-terminal control element. Connected in series to form a plurality of series circuits, each of which is individually connected to each of the power supply terminals, the three-terminal control element conducts according to the lighting command signal, and the power supply terminals for powering the lamp Since the signal is supplied to the line, it is possible to obtain a traffic signal control device capable of performing signal display according to the lighting command signal.

Since the choke coil is connected in series to the series circuit of the AC power source and the three-terminal control element, it has a low impedance when transmitting low frequency power to the traffic signal, reducing power loss and increasing the frequency from the traffic signal. When receiving the frequency signal, the impedance becomes high, and the attenuation of the frequency signal due to the inflow to the AC power supply is prevented. This allows the lamp lighting line to be shared for power transmission and signal transmission, and the receiving circuit can reliably receive the frequency signal.

The receiving circuit is connected to the power supply terminal corresponding to the lamp lighting line to which the transmitting circuit is connected, decodes the frequency of the frequency signal and outputs the passing number signal, and thus receives the passing number signal. The signal control unit obtains the signal lamp lighting time from the passing vehicle number signal, and outputs the lighting command signal according to the signal lamp lighting time, so that the traffic light control device capable of controlling the signal lamp lighting time according to the passing vehicle number is obtained.

[0018]

1 is a block diagram showing the construction of a traffic light and a traffic light controller according to the present invention. In the figure, the same reference numerals as those in FIG. 5 indicate identical components. Three
Is a power supply circuit, 4 is a vehicle detector, and 5 is a transmission circuit.

The power supply circuit 3 includes a transformer 31. The transformer 31 has a plurality of input windings 311 to 313.
And an output winding 314. Input winding 311 to
313 is separately connected to each of the lamp terminals 11 to 13. The output winding 314 obtains the power supply E1. When the vehicle detector 4 and the transmission circuit 5 operate with direct current, a full-wave rectifier circuit, a constant voltage circuit, and the like (not shown) are provided after the output winding 314 to convert the power source E1 to direct current.

The vehicle detector 4 includes the output winding 3 of the power supply circuit 3.
The power source E1 is supplied from 14 to operate, and the number of vehicles passing through the traffic signal A is detected to output a vehicle detection signal S41.
The vehicle detector 4 may be any vehicle that can detect a vehicle, and an ultrasonic vehicle detector that has been used conventionally can be adopted.

The transmitter circuit 5 includes an output winding 31 of the power supply circuit 3.
4 operates by being supplied with power E1 from the signal generating circuit 51.
And an output circuit 52. Signal generation circuit 51
Generates a frequency signal S51 according to the number of detected vehicles based on the vehicle detection signal S41. The output circuit 52 is connected to the lamp terminal 12 or 13 to which the "yellow" signal lamp 22 or the "red" signal lamp 23 is connected so that the frequency signal S51 is transmitted via the lamp lighting line B2 or B3. Are combined. The output circuit 52 is a lamp lighting line B2 or B3.
In order to prevent the power transmitted from the power transmission circuit from being directly transmitted to the signal generation circuit 51, a transformer is provided as an isolation. In the example, the output winding of the transformer is
It is inserted and connected between the “red” signal lamp 23 and the lamp terminal 13. Also, for the output winding of the transformer, dummy resistors (not shown) are connected in series, and both ends of the series circuit are connected to the lamp terminal 1
3 and the lamp terminal 14, and can be connected in parallel to the signal lamp 23.

As mentioned above, the lamp terminals 11 to 13 are
Power is selectively transmitted from the lamp lighting lines B1 to B3, and the signal lamps 21 to 23 are lamp terminals 11 to 13, respectively.
Since the signal display is performed by the power transmitted to the vehicle, a traffic light capable of performing an appropriate signal display of "blue", "yellow" or "red" according to the power transmission is obtained.

In the power supply circuit 3, since the transformer 31 has a plurality of input windings 311 to 313 and an output winding 314, and the input windings 311 to 313 are connected to the lamp terminals 11 to 13, Input winding 3 via lamp lighting lines B1 to B3
The electric power transmitted alternatively to 11 to 313 is OR-coupled, and the power supply E1 without interruption is obtained from the output winding 314. Therefore, it is possible to obtain electric power from the existing wiring equipment (lamp lighting lines B1 to B3) and use it as the power source for the vehicle detector 4 and the transmission circuit 5 without providing new wiring equipment.

The vehicle detector 4 includes the output winding 3 of the power supply circuit 3.
The power supply E1 is supplied from 14 to operate, and the number of vehicles passing through is detected and output as a vehicle detection signal S41. The transmission circuit 5 receives the power supply E1 from the output winding 314 of the power supply circuit 3. The signal generating circuit 51 operates to generate a frequency signal S51 according to the number of detected vehicles based on the vehicle detection signal S41, and the output circuit 52 transmits the frequency signal S51 through the lighting device lighting line B2 or B3. As described above, since it is coupled to the lamp terminal 12 or 13, a traffic signal that can enable signal transmission regarding the number of passing vehicles using the existing wiring equipment (lamp lighting line B2 or B3) is obtained.

Since the output circuit 52 is connected to the lamp terminal 12 or 13 to which the "yellow" signal light 22 or the "red" signal light 23 is connected, the output circuit 52 fails and the "blue" signal light is output. 21 and "yellow" traffic light 22 or "red"
Even if the signal light 23 of the
Alternatively, the driver can determine that the traffic signal is broken by turning on the "red" signal light 23. Further, since the signal display in the intersecting direction is not a "blue" signal display by the GGD unit, even if the driver believes that the "blue" signal light 21 is displayed, a collision accident will not occur. Absent. As a result, it is possible to obtain a traffic signal that enables the signal transmission regarding the number of passing vehicles using the existing wiring equipment and can also maintain the fail safe.

FIG. 2 is a block diagram showing a specific configuration of the vehicle detector and the transmission circuit shown in FIG. In the figure,
The same reference numerals as those in FIG. 1 denote the same components.

The vehicle detector 4 has a camera 41 and an image processing circuit 42. The camera 41 is a small CCD
It consists of a camera. The image processing circuit 42 analyzes the image captured by the camera 41, detects the number of vehicles passing through the traffic light A, and outputs them as vehicle detection signals S411 and S412. The vehicle detection signals S411 and S412 indicate the number of passing vehicles per lane. Therefore, it can be easily attached to a conventional traffic signal.

The signal generating circuit 51 is a carrier wave generating circuit 51.
1 and intermittent modulation circuits 512 and 513. The carrier wave generation circuit 511 generates a carrier wave Fo having a frequency f0. The frequency f0 is set to 50 kHz, for example.
The intermittent modulation circuit 512 intermittently modulates the carrier wave Fo at the frequency f1 based on the vehicle detection signal S411 to generate the frequency signal S5.
11 is generated. Similarly, the intermittent modulation circuit 513 intermittently modulates the carrier wave Fo at the frequency f2 based on the vehicle detection signal S412 to generate the frequency signal S512. Frequency f
1 and f2 change according to the number of passing vehicles. Therefore, the control circuit (not shown) that has received the frequency signals S511 and S512 can know the number of passing vehicles by identifying the frequencies f1 and f2.

The output circuit 52 includes a power amplifier circuit 521,
And a transformer 522. Power amplifier circuit 521
Amplifies the frequency signals S511 and S512. In the transformer 522, the output winding 22b has the lamp terminal 13 and the signal lamp 2
3 is inserted and connected. Therefore, the power transmitted from the lamp lighting line B3 is prevented from being directly transmitted to the signal generating circuit 51, and the frequency signal S511 or the frequency signal S512 is directly transmitted to the lamp lighting line B3. Can be prevented and isolation can be achieved.

The transmission circuit 5 further has a current detection circuit 53. The current detection circuit 53 is a current transformer 53.
1 and a processing circuit 532. The current transformer 531 is connected in series to the output winding 22b of the transformer 522, detects the output current Io of the frequency signal S511 or the frequency signal S512 flowing through the output winding 22b, and the processing circuit 532 detects the current according to the output current Io. Signal S53
Is output. The output circuit 52 further includes a gain control circuit 52.
Have three. The gain control circuit 523 determines that the output current Io is a constant current, eg, 20 based on the current detection signal S53.
The power amplifier circuit 521 is controlled so as to become mA. As a result, when the signal lights 21 to 23 are controlled by constant voltage driving, a predetermined reception level can be obtained at the reception point even if the frequency signals S511 and S512 are transmitted over a long distance, and highly reliable signal transmission can be performed. .

The traffic signal control device will be described with reference to FIG. Normally, a plurality of traffic signals A are connected, but for convenience of description, FIG. 1 shows only one system of traffic signals.

The traffic light A is any one of the above-mentioned. The lamp lighting lines B1 to B3 are connected to the lamp terminals 11 to 13 and transmit power to the signal lamps 21 to 23.

The control circuit C includes a lamp driving circuit 6 and a receiving circuit 7. The lamp drive circuit 6 includes a plurality of power supply terminals 611 to 614, an AC power supply 62, a plurality of three-terminal control elements 631 to 633, and a plurality of choke coils 6.
41 to 643 are included. The AC power supply 62 is a commercial power supply. The three-terminal control elements 631 to 633 are composed of thyristors and the like. AC power source 62, three-terminal control element 63
1 and the choke coil 641 are connected in series to form a series circuit for driving the “blue” signal lamp 21. Similarly, the AC power supply 62, the three-terminal control element 632, and the choke coil 642 are connected in series, and the AC power supply 62, the three-terminal control element 633, and the choke coil 643 form a series circuit for driving the “yellow” signal light 22. Connected in series,
A series circuit for driving the "red" signal lamp 23 is configured. The power supply terminal 614 is a common terminal. Each of the series circuits is separately connected to the power supply terminals 631 to 633, the lighting command signals S61 to S63 are input, and the three-terminal control elements 631 to 633 are lighting command signals S61 to S6.
3, the power supply terminals 611 to 613 supply power to the lamp lighting lines B1 to B3.

The receiving circuit 7 includes a current transformer 71,
It has a resistor 72 and a reception processing circuit 73. When the receiving circuit 7 is connected to the lamp lighting line to which the transmitting circuit 5 is connected, for example, the lamp lighting line B3 to which the “red” signal lamp 23 is connected, the power source corresponding to the lamp lighting line B3. It is coupled to the supply terminal 613. In the embodiment, both ends of the series circuit of the current transformer 71 and the resistor 72 are connected to the power supply terminals 613 and 614, and the current transformer 71 is input to the power supply terminal 613 as the frequency signals S511 and S511.
512 is received. The resistor 72 is for preventing a decrease in impedance between the power supply terminal 613 and the power supply terminal 614, that is, for achieving impedance matching. The reception processing circuit 73 uses the frequency signals S511 and S51.
2 is input, the frequencies f1 and f2 of the frequency signals S511 and S512 are decoded, and the passing number signal S7 is output.

The traffic light A is the one described above, and the lighting device lighting lines B1 to B3 are connected to the lighting device terminals 11 to 13 and transmit electric power to the signal lights 21 to 23. 6 is an AC power source 62 and a three-terminal control element 631
To 633 are connected in series to form a plurality of series circuits, each of the series circuits is separately connected to the power supply terminals 611 to 613, and the three-terminal control elements 631 to 633 are conducted by the lighting command signals S61 to S63, Power supply terminal 611
~ 613 supplies electric power to the lighting device lighting lines B1 to B3, a signal control device capable of performing signal display according to the lighting command signals S61 to S63 and performing signal transmission related to the number of passing vehicles is obtained. To be

Since the choke coils 641 to 643 are connected in series to the series circuit of the AC power source 62 and the three-terminal control elements 631 to 633, when transmitting low frequency power to the traffic signal A, the impedance becomes low and power loss occurs. Frequency signal S51 from the traffic signal A
1, when receiving S512, the impedance becomes high, and the frequency signal S511 due to the inflow to the AC power supply 62,
Prevent the attenuation of S512. As a result, the lamp lighting line B2 or B3 can be shared for power transmission and signal transmission, and the reception circuit 7 causes the frequency signals S511 and S5 to be transmitted.
12 can be reliably received.

The receiving circuit 7 has a power supply terminal 61 corresponding to the lamp lighting line B2 or B3 to which the transmitting circuit 5 is connected.
2 or 613 and coupled to the frequency signals S511, S5
Since the frequency of 12 is decoded and the passing vehicle number signal S7 is output, the signal control unit receiving the passing vehicle number signal S7 obtains the signal lamp lighting time from the passing vehicle number signal S7, and lighting command signals S61 to S63 corresponding to the signal lamp lighting time. By outputting, a traffic signal control device capable of controlling the signal lamp lighting time according to the number of passing vehicles can be obtained.

FIG. 3 is a specific circuit diagram of the receiving circuit shown in FIG. The same reference numerals as those in FIG. 1 denote the same components.

The receiving circuit 7 includes current transformers 711 to 711.
713, resistors 721 to 723, carrier band filter 7
4, local frequency generating circuit 75, mixer 76, frequency signal bandpass filters 771 to 776, and rectifying circuit 781 to
Has 786. The current transformer 711 and the resistor 721 are connected in series, and both ends of the series circuit are terminals 701,
It is connected to 704. The terminal 701 is the power supply terminal 6
13 and the terminal 704 is connected to the power supply terminal 614. The current transformer 711 is a 1-system (first
Direction) frequency signals S511 and S512 are received. The resistor 721 makes it possible to receive the frequency signals S511 and S512 even when the three-terminal control element 633 is off, and the power supply terminal 613 when the three-terminal control element 633 is on.
And 614 to prevent a decrease in impedance. Similarly, the current transformer 712 and the resistor 722
Are connected in series, and the current transformer 712 is a second system (second
Direction) frequency signals S521 and S522. The current transformer 713 and the resistor 723 are connected in series,
The current transformer 713 receives the frequency signals S531 and S532 of the third system (third direction). The carrier band filter 74 is composed of a band pass filter and passes the frequency fo of the frequency band of the carrier Fo. As a result, frequency signals S511 and S512 are obtained. The local frequency generation circuit 75 generates a local frequency fo having the same frequency as the carrier wave Fo. The mixer 76 receives the input frequency signals S511, S512, S521, S522, S53.
1, S532 is modulated by the local frequency fo, and modulation signals S761 to S761 related to the intermittent modulation frequencies f1 to f6.
Obtain S766. Frequency signal bandpass filters 771-77
6 passes the modulated signals S761 to S766. The rectifier circuits 781 to 786 detect and rectify the modulated signals S761 to S766 to obtain passing vehicle number signals S71 to S76.

FIG. 4 is a timing chart showing an operation image of the traffic signal control apparatus according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 3 denote the same components. This will be described with reference to FIGS.

At time t1, the intermittent modulation circuit 512 determines the frequency signal S based on the vehicle detection signal S411 in the first lane.
511, and the output circuit 52 transmits the frequency signal S511 to the lamp lighting line B3. Current transformer 711
Receives the frequency signal S511, the mixer 76 outputs the modulation signal S761 from the frequency signal S511, and the rectifier circuit 7
81 performs detection and rectification, and outputs a passing vehicle number signal S71.

At time t2, the intermittent modulation circuit 513 determines the frequency signal S based on the vehicle detection signal S412 in the second lane.
512, and the output circuit 52 transmits the frequency signal S512 to the lamp lighting line B3. Current transformer 711
Receives the frequency signal S511, the mixer 76 outputs the modulation signal S762 from the frequency signal S512, and the rectifier circuit 7
Reference numeral 82 performs detection and rectification, and outputs a passing vehicle number signal S72.

The same applies to other systems.

[0044]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a signal device that enables signal transmission regarding the number of passing vehicles using the existing wiring equipment and can also maintain fail-safe. (B) It is possible to provide a traffic signal control device capable of controlling the signal lamp lighting time according to the number of passing vehicles.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a traffic light and a traffic light control device according to the present invention.

FIG. 2 is a block diagram showing a specific configuration of a vehicle detector and a transmission circuit shown in FIG.

FIG. 3 is a specific circuit diagram of the receiving circuit shown in FIG.

FIG. 4 is a timing chart showing an operation image of the traffic signal control device according to the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional traffic light control device.

FIG. 6 is a specific circuit diagram of the presentation determination circuit shown in FIG.

[Explanation of symbols]

 A signal device 11-14 lamp terminal 21-23 signal lamp 3 power supply circuit 31 transformer 4 vehicle detector 41 CCD camera 42 image processing circuit 5 transmission circuit 51 signal generation circuit 52 output circuit S51 frequency signal B1 to B4 lamp lighting line C Control circuit 6 Lamp drive circuit 611 to 614 Power supply terminal 62 AC power supply 631 to 633 Three terminal control element 641 to 643 Choke coil 7 Reception circuit 71 Current transformer 72 Resistance 73 Reception processing circuit S7 Passing number signal 8 Indication judgment circuit S8 Simultaneous display judgment signal

Claims (6)

[Claims] 1. A traffic signal including a plurality of lamp terminals, a plurality of signal lights, a power supply circuit, a vehicle detector, and a transmission circuit, wherein each of the lamp terminals is connected to a lamp lighting line. Alternatively, the plurality of signal lights include “blue”, “yellow”, and “red” signal lights, and each of the signal lights is separately connected to each of the lamp terminals. The power supply circuit includes a transformer, the transformer having a plurality of input windings and an output winding, each of the input windings. The vehicle detector is separately connected to each of the lamp terminals, operates by being supplied with power from the output winding of the power supply circuit, detects the number of vehicles passing through, and outputs it as a vehicle detection signal. The transmission circuit is Power is supplied from the output winding of the circuit to operate, and has a signal generation circuit and an output circuit, wherein the signal generation circuit generates a frequency signal according to the number of detected vehicles based on the vehicle detection signal, A traffic light that is coupled to a lamp terminal to which the "yellow" or "red" signal lamp is connected so that the output circuit transmits the frequency signal through the lamp lighting line. 2. The vehicle detector includes a camera and an image processing circuit, the image processing circuit analyzes an image captured by the camera, detects the number of vehicles passing through, and detects the vehicle detection signal. The traffic light according to claim 1, which is output as. 3. The traffic signal according to claim 1, wherein the transmission circuit is such that the signal generation circuit intermittently modulates a carrier wave to generate the frequency signal. 4. The traffic signal according to claim 1, 2 or 3, wherein in the transmission circuit, the output circuit has a transformer, and an output winding of the transformer is coupled to one of the lamp terminals. 5. The transmission circuit has a current detection circuit,
The current detection circuit is connected in series to the output circuit, detects the output current of the output circuit and outputs a current detection signal,
The output circuit controls the output current to be a constant current based on the current detection signal.
The traffic light according to 2, 3 or 4. 6. A traffic signal control device including a traffic light, a lighting device lighting line, and a control circuit, wherein the signaling device is any one of claims 1 to 5, wherein the lighting device lighting wire is provided. Is connected to the lamp terminal and transmits power to the signal lamp, the control circuit includes a lamp driving circuit and a receiving circuit, and the lamp driving circuit supplies a plurality of power supplies. A terminal, an AC power supply, a plurality of three-terminal control element, and a plurality of choke coils, the AC power supply, the three-terminal control element and the choke coil are connected in series to form a plurality of series circuits, Each of the series circuits is separately connected to each of the power supply terminals, a lighting command signal is input, the three-terminal control element conducts by the lighting command signal, and the power supply terminal lights the power of the lamp. Supply to the line The receiving circuit is coupled to the power supply terminal corresponding to the lamp lighting line to which the transmitting circuit is connected, the frequency signal is input, and the frequency of the frequency signal is decoded to determine the number of passing units. A traffic light control device that outputs a signal.