KR102497039B1 - Apparatis for managing peripheral device for pedestrian traffic lights using signal detecting module - Google Patents

Abstract

The present invention relates to a device for operating a peripheral device for pedestrian traffic lights by using a signal detection module. The device comprises: a signal controller which supplies pedestrian signals and AC power for the operation of a plurality of pedestrian traffic lights; and a signal detection module which detects a driving current applied to the plurality of pedestrian traffic lights, generates pedestrian signal information based on the detected driving current, generate remaining pedestrian time information based on the generated pedestrian signal information, and provides the pedestrian signal information and the generated remaining pedestrian time information to a peripheral device connected through a communication network. A signal detection module, which detects pedestrian light signals and converts the same into RS485 signals, can be easily added and installed on an existing signal controller in operation to make it possible to safely and easily operate peripheral devices for pedestrian traffic lights without additional production of existing operating devices. Furthermore, a single signal detection module can simultaneously control peripheral devices for pedestrian traffic lights to make it possible to prevent malfunctions between the peripheral devices and the pedestrian traffic lights.

Description

Pedestrian traffic light peripheral operation device using signal detection module {APPARATIS FOR MANAGING PERIPHERAL DEVICE FOR PEDESTRIAN TRAFFIC LIGHTS USING SIGNAL DETECTING MODULE}

The present invention relates to an apparatus for operating a walking traffic light peripheral device using a signal detection module.

In general, pedestrian safety devices such as numeric type residual indicators, floor traffic lights, and voice guidance systems are installed and operated around pedestrian traffic lights for pedestrian safety. In addition, it is possible to add various devices for conveying the crosswalk situation to pedestrians. Accordingly, it will be necessary to share pedestrian traffic light information for the operation of peripheral devices for pedestrians.

1 is a schematic block diagram of a device for operating a walking light according to the prior art.

As shown in FIG. 1, in the conventional walking light operating device, the signal controller of the new/old version is operated differently for peripheral devices. The signal controller of the new version can operate peripheral devices by additionally applying an option board. The old version of the signal controller detects the state of the pedestrian traffic light and operates it. However, due to the self-sensing operation, there is a problem in that malfunction frequently occurs during synchronization between devices.

Meanwhile, about 30,000 signal controllers of the old version are currently installed and operated nationwide.

Re-installation of such an old version signal controller with a new version may incur a significant cost burden.

Accordingly, it will be necessary to have a plan to allow the old version of the signal controller to be operated additionally with the pedestrian safety device without reinstalling the new version.

Registered Patent Publication No. 10-0506589 (Public date: 2005. 08. 08) Registered Patent Publication No. 10-1276935 (Public date: 2013. 06. 19)

The object of the embodiments of the present invention to improve the above-mentioned problems is to easily and conveniently add a signal detection module that detects and converts a walking light signal into an RS485 signal to an existing signal controller, so that the walking traffic light peripherals can be operated safely and conveniently. An apparatus for operating a peripheral device for a walking traffic light using a detection module is provided.

In order to achieve the above object, an apparatus for operating peripheral devices for walking traffic lights using a signal detection module according to an embodiment of the present invention includes a signal controller for supplying walking signals and AC power for operating a plurality of walking traffic lights; and detects driving current applied to the plurality of walking signals, generates walking signal information based thereon, generates walking remaining time information based on the walking signal information, and transmits the walking signal information and walking remaining time information to a communication network. It is characterized in that it includes a signal detection module provided to the peripheral device connected through.

The plurality of walking traffic lights include a first walking traffic light and a second walking traffic light, the signal controller is connected to the first walking traffic light and the second walking traffic light through an AC power line, and the signal detection module supplies power. receiving power supply; a contradiction detecting unit for generating walking signal information of each walking signal light by measuring the drive current flowing through the AC power line, and performing a contradiction detection function of each walking signal light based on the walking signal information; a time information processor generating time information for a walking remaining time timer function; a communication unit transmitting the generated time information to the peripheral device through the communication network; and a control unit that collects state information of each component constituting the signal detection module and controls an operation based thereon.

The contradiction detecting unit measures the drive current flowing through the AC power line and generates walking signal information of each walking signal light; and a contradiction detection processing unit performing a contradiction detection function of each walking signal light based on the walking signal information.

The communication unit is characterized in that it is connected to peripheral devices through a single communication network.

The signal detection module may further include a walking light state information generation unit generating state information and operation information of each walking traffic light based on the information collected by the control unit.

The peripheral device may include at least one of a numeric type remaining indicator, a voice guidance device, and a floor traffic light.

In the device for operating a walking traffic light peripheral device using a signal detection module according to an embodiment of the present invention, a signal detection module for detecting a walking light signal and converting it into an RS485 signal can be easily added to an existing signal controller, so that the existing operation It is possible to safely and conveniently operate peripheral devices for walking traffic lights without additional manufacturing of the device.

In addition, since one embodiment of the present invention can simultaneously control the walking traffic light peripheral device with one signal detection module, it is possible to prevent malfunction between the walking traffic light and the peripheral devices.

1 is a schematic block diagram of a device for operating a walking light according to the prior art.
2 is a block diagram schematically illustrating an apparatus for operating a walking traffic light peripheral device using a signal detection module according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating an example in which an apparatus for operating a walking traffic light peripheral device using the signal detection module of FIG. 2 is linked with a peripheral device.
4 is a block diagram showing the detailed configuration of the signal detection module of FIG. 2;

The present invention as described above will be described in detail through the accompanying drawings and embodiments.

It should be noted that technical terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in the present invention should be interpreted in terms commonly understood by those of ordinary skill in the art to which the present invention belongs, unless specifically defined otherwise in the present invention, and are excessively inclusive. It should not be interpreted in a positive sense or in an excessively reduced sense. In addition, when the technical terms used in the present invention are incorrect technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that those skilled in the art can correctly understand. In addition, general terms used in the present invention should be interpreted as defined in advance or according to context, and should not be interpreted in an excessively reduced sense.

Also, singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various elements or steps described in the invention, and some of the elements or steps are included. It should be construed that it may not be, or may further include additional components or steps.

In addition, terms including ordinal numbers such as first and second used in the present invention may be used to describe components, but components should not be limited by the terms. Terms are used only to distinguish one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

Figure 2 is a block diagram schematically showing a walking traffic light peripheral device operating device using a signal detection module according to an embodiment of the present invention, Figure 3 is a walking traffic light peripheral device operating device using the signal detection module of FIG. 2 is linked to the peripheral device It is a drawing showing an example, and FIG. 4 is a block diagram showing a detailed configuration of the signal detection module of FIG. 2 .

An apparatus for operating a walking traffic light peripheral device using a signal detection module according to an embodiment of the present invention is a device to which walking signal detection technology using CT (Current Transformer) and RS 485 signal generation technology are applied, without modification of the existing signal controller. It is a device that detects the signal generated from the signal driver using CT (Current Transformer), performs contradiction detection processing, and generates walking light status information to interoperate with peripheral devices.

As shown in FIG. 2 , an apparatus for operating a pedestrian traffic light peripheral device 100 using a signal detection module according to an embodiment of the present invention is a signal detection module connected to a signal controller 110 and a peripheral device 130 through a communication network. (120).

The signal controller 110 is a device for supplying walking signals and AC power for operation of a plurality of walking traffic lights, and includes a signal driving unit 111 and a first control unit 112.

The signal driver 111 serves to supply a walking signal and AC power to each walking traffic light 20 .

Specifically, the signal driver 111 controls the walking traffic light 20 by supplying AC power to the walking signal. At this time, the signal driver 111 controls the green traffic light and the red traffic light with separate green and red signals.

Meanwhile, the plurality of walking traffic lights 20 include a first walking traffic light 20 (green traffic light) and a second walking traffic light 20 (red traffic light). Each of the first and second walking traffic lights 20 and 20 and the signal driver 111 is connected with an AC power line.

The first controller 112 controls the operation of the signal driver 111 through a preset control program.

More specifically, the signal controller 110 is a signal provided with a plurality of connection terminals to which control signal lines for outputting control signals for controlling a plurality of pedestrian traffic lights 20 and AC power lines for power supply are connected. A driving unit 111 and a first control unit 112 for controlling the signal driving unit 111 are provided.

In addition, the signal controller 110 includes one or more central processing unit boards, a plurality of loop detection boards for detecting the presence of pedestrians and other information, a communication device for communicating with the control center, An operator input device (MMI, Man-Machine Interface Unit) to which a field operator's manipulation signal is input and a power supply device to supply power to the signal controller 110 may be provided.

The signal driver 111 includes a control signal line, an AC power line, a control board, and connection terminals to which an additional driving unit (not shown) can be assembled. This connection terminal may be a connector or may be a PCB terminal to be directly assembled by a method such as soldering.

The signal driving unit 111 includes a traffic light driving unit (not shown) for outputting a traffic light driving signal for driving a plurality of traffic lights including red and green traffic lights, and a first terminal unit for connection with the first control unit 112. (not shown) and a second terminal part (not shown) for connecting the output from the traffic light driver to the connection line to each of the walking traffic lights 20. At this time, the traffic light driving unit may further include a status display unit (not shown) using a light emitting diode (LED) for displaying a state of the traffic light driving unit.

Although not shown, the signal driver 111 receives a control signal from an AC relay for applying an AC voltage to each walking traffic light 20 and a first control unit 112 to apply a control signal to the AC relay. A latch may be provided for

The signal detection module 120 senses the driving current applied to the plurality of walking traffic lights 20, generates walking signal information based on this, generates walking remaining time information based on the walking signal information, and walk signal information. It is a device that provides the remaining walking time information to the peripheral device 130 connected through a communication network.

To this end, as shown in FIG. 4, the signal detection module 120 includes a power supply unit 121, a contradiction detection unit 122, a time information processing unit 123, a communication unit 125, a walking light state information generator ( 124) and a second control unit 126.

The power supply unit 121 is a device that supplies stable power to the signal detection module 125 .

The contradiction detection unit 122 measures the driving current flowing through the AC power line to generate walking signal information of each walking traffic light 20, and performs a contradiction detection function of each walking traffic light 20 based on the walking signal information. As a device to perform, it is possible to prevent the risk of a pedestrian accident due to a signal malfunction by detecting the inconsistency of the pedestrian traffic light 20.

To this end, the contradiction detection unit 122 includes a walking signal detection unit 1221 and a contradiction detection processing unit 1222.

The walking signal detection unit 1221 is a device that monitors the signal state of the walking traffic light 20 and serves to detect the signal of the walking traffic light using CT. Walking signal information such as a walking signal is generated.

The contradiction detection processing unit 1222 performs a contradiction detection function of each walking traffic light 20 based on the walking signal information generated by the walking signal detecting unit 1221 .

In other words, the contradiction detection unit 122 measures the drive current flowing in the AC power line connected to the signal driver 111 to generate the signal state of each walking traffic light 20, that is, walking signal information, and generates the walking signal information. It is a device that performs the contradiction detection function of each pedestrian traffic light 20 based on the basis. That is, the contradiction detection unit 122 monitors the power supply state using a CT connected to the AC power line of the walking traffic light 20 and monitors both the power supply lines of the walking red and green traffic lights to implement a contradiction detection function.

To this end, the contradiction detection unit 122 has a CT (Current Transformer) connected to the AC power line to measure the driving (consumption) current of the walking traffic light 20. More specifically, the CT measures the AC current and/or AC voltage flowing into the pedestrian traffic light 20 and transmits it to the second controller 126 . To this end, the contradiction detection unit 122 includes a voltage/current detection circuit (CT) for measuring the AC voltage and/or AC current applied to the pedestrian traffic light 20, an amplification circuit for amplifying the detected signal, and an amplification circuit for amplifying the detected signal. A smoothing circuit for converting the converted signal into a DC signal and an A/D converter for converting the converted DC signal into a digital signal may be provided. Meanwhile, the A/D converter may be implemented by being embedded in the second controller 126.

As the voltage/current detection circuit, a commonly used voltage detection circuit and current detection circuit can be used in addition to the CT. For example, a photo-coupler having a diode part connected to the AC power line supplied to the pedestrian traffic light 20 is used, or a pickup coil is installed on the AC power line to thereby flow the current through the AC power line. can be detected.

The contradiction detecting unit 122 determines whether or not the connection line to the walking traffic light 20 is disconnected or shorted according to the signal from the CT, and whether the traffic light is inconsistent.

On the other hand, in the method of using a CT (i.e., current transformer) in the present invention, the power supply line for driving the walking traffic light 20 is passed through the center of the ring-shaped CT, thereby enabling the lighting of the walking traffic light 20. For this purpose, when current flows through the power line, an induced current is generated in the CT surrounding the power supply line to drive the primary light emitting diode (LED) of the LED type photocoupler, and the light generated at this time is emitted to the secondary photodiode. It is possible to determine whether the walking traffic light 20 is turned on by detecting the (PD) and generating a voltage of a certain size (usually 5V).

The contradiction detection unit 122 determines the signal state of the walking traffic light 20 through the contradiction detection processing unit 1222 of the red or green walking signal detected by the walking signal detection unit 1221, and determines the length of each signal and the The cycle period is analyzed and the contradiction detection function is performed through a preset contradiction detection program, and the resulting information is stored in a separate storage device.

The time information processing unit 123 is a device that generates time information for the remaining walking time timer function, and performs the remaining walking time timer information function and the day/night identification control function of the walking traffic light 20 . Also, the time information processing unit 123 may generate remaining time information to be provided to the peripheral device 130 based on state information.

For example, the remaining numeric display unit of the peripheral device 130 may display the remaining time information generated by the time information processing unit using an LED.

The communication unit 125 is a device that transmits state information of the walking traffic light 20 or time information generated by the time information processing unit 123 and remaining time information to the peripheral device 130 through a communication network. At this time, the communication unit 125 converts each information into an RS485 communication signal capable of interworking with the peripheral device 130 and transmits it.

To this end, the communication unit 125 is connected to the peripheral device 130 through a single communication network.

In the present invention, by applying the RS485 protocol to the previously installed signal controller 110 to configure its own RS485 network, it is possible to share information such as walking signals through interworking with the peripheral device 130.

Although not shown, the communication unit 125 may include a system monitoring unit, a network communication unit, and a mode switching unit.

The system monitoring unit serves to monitor the communication state with the peripheral device 130 and the operation state of the signal monitoring module. The system monitoring unit checks the RS485 communication status with the peripheral device 130, checks the driving status, and then provides the corresponding information to the network communication unit and the second control unit 126.

The network communication unit has an RS485 communication interface for communication with the peripheral device 130. The network communication unit can share the state information detected by the contradiction detection unit 122 with the peripheral device 130 through the RS485 communication interface.

The mode switching unit serves to convert the peripheral device 130 into a bypass mode when an error occurs in the operation of the peripheral device 130 . At this time, the bypass mode is switched to the bypass mode when an error occurs in the peripheral device 130, and the peripheral device 130 having an error separates the RS485 signal line from the communication network to prevent malfunction of the network.

Specifically, the mode conversion unit is switched to the bypass mode by the second controller 126 when there is no update of state information between the network communication unit and the peripheral device 130 and when there is an operation error in the signal detection module 125. is converted

To this end, the mode conversion unit includes a relay or a switching element.

In the present invention, by configuring the mode switching unit in the signal detection module 125, a plurality of peripheral devices 130 are connected through a single network, and the board of the peripheral device 130 in which an error occurs during operation of the plurality of peripheral devices 130 Implements the function of bypassing RS485.

That is, the mode switching unit periodically exchanges status information with the peripheral device 130, and if there is no update of the status information, it reports a network failure and switches the corresponding peripheral device 130 to the bypass mode.

In addition, if an abnormality occurs while the second control unit 126 monitors the operating state of the peripheral device 130, the mode switching unit first reports and then switches to the bypass mode. That is, the mode switching unit separates the RS485 communication line of the peripheral device 130 from the network of other peripheral devices 130 when an error occurs while the second control unit 126 monitors the operating state of the peripheral device 130, thereby causing malfunction of the network. can prevent

At this time, the RS485 mode of the signal detection module 125 is a basic bypass mode, and when the system state is normal, the second control unit 126 converts to the normal mode.

In addition, the mode conversion is performed using an element capable of switching an analog signal, such as a relay or an analog switch.

The walking light state information generation unit 124 is a device that generates state information and operation information of each walking traffic light based on the information collected by the second control unit 126.

The second control unit 126 is a device that collects state information of each component constituting the signal detection module 125 and controls operations based on this, and performs system state control, peripheral device information collection and processing functions. . The second controller 126 controls to turn off the peripheral device 130 through the mode switching unit when a contradiction is detected in the signal detection module 125 or the peripheral device 130 .

The second control unit 126 sets the operation mode of the system (signal decision unit, operation mode, etc.) and various parameters necessary for system operation (information transmission/reception interval, update period, mode switching time setting, etc.) .

In addition, the second control unit 126 determines that an abnormality such as disconnection/disconnection of the connection line from the voltage or current sensed by the CT to the traffic light or inconsistency in the signal of the walking traffic light 20 has occurred, the peripheral device 130 ) to switch the mode of the peripheral device.

That is, the second controller 126 controls the operation of the peripheral device 130 when an error occurs in communication with the peripheral device 130 or when an error occurs in the walking traffic light 20 from the voltage or current detected by the CT. The operation can be turned off by switching the mode.

Meanwhile, the peripheral device 130 may include at least one of a numeric type remaining indicator, a voice guidance device, and a floor traffic light.

The peripheral devices 130 may each have a unique address. In this case, the peripheral device 130 broadcasts and transmits control data using this address, and the second control unit operates according to the control data when control data having an address matching its own address is broadcasted. do In addition, a separate address designating data to be sent to all peripheral devices 130 may be set.

The second controller 126 broadcasts a packet containing control data for all peripheral devices 130 belonging to each group at regular intervals, and each peripheral device 130 provides status information at a designated time. 2 can be configured to transmit to the control unit 126. The control data for all peripheral devices 130 may include an address of each peripheral device 130, control information for the corresponding peripheral device 130, information for error check coding or error correction coding, and the like.

The data transmitted from the second control unit 126 to the peripheral device 130 includes control commands of each peripheral device 130, option information on how to operate a mode in case of traffic light failure or communication failure, and the like. Data transmitted from the device 130 to the second controller 126 may include information about the driving state of the peripheral device 130 .

In the apparatus for operating a walking traffic light peripheral device using a signal detection module according to an embodiment of the present invention configured as described above, a signal detection module for detecting a walking light signal and converting it into an RS485 signal can be easily added to an existing signal controller. , It is possible to operate the walking traffic light peripheral devices safely and simply without additional manufacturing of the existing operating device, and also, since the walking traffic light peripheral device can be controlled simultaneously in one signal detection module, the relationship between the walking traffic light and the peripheral devices It is possible to prevent malfunction of

In the above, even though all components constituting the embodiment of the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate. In addition, although all of the components may be implemented as a single independent piece of hardware, some or all of the components are selectively combined to perform some or all of the combined functions in one or a plurality of pieces of hardware. It may be implemented as a computer program having. Codes and code segments constituting the computer program may be easily inferred by a person skilled in the art. Such a computer program may implement an embodiment of the present invention by being stored in a computer readable storage medium, read and executed by a computer.

On the other hand, it is preferable that each component constituting the device for operating a peripheral device for a walking traffic light using a signal detection module according to an embodiment of the present invention is provided inside a case made of metal for stable operation of the device from the surrounding environment. In addition, a coating layer may be formed on the case to improve weather resistance and wear resistance of the metal surface.

The coating materials of this coating layer include 25% by weight of triglycidyl p-aminophenol, 18% by weight of alkoxyalkyl monoamine, 12% by weight of hafnium, 16% by weight of magnesium organic acid, 9% by weight of titanium oxide (TiO2), and 9% by weight of aluminum oxide (AIO2). ) 10% by weight, 10% by weight of Transcutol, and the coating thickness can be formed to 9㎛. Triglycidyl p-aminophenol and alkoxyalkyl monoamine serve to prevent corrosion, weather resistance, discoloration, etc., and hafnium is a transition metal element with wear resistance and weather resistance, and serves to have excellent waterproof and corrosion resistance. Organic acid magnesium serves to impart alkali resistance and wettability to the surface of the coating film, Transcutol serves as a surface activity, and titanium oxide and aluminum oxide are added for the purpose of fire resistance and chemical stability. The reason for limiting the ratio of the components and the coating thickness as described above is that the present inventors have repeatedly failed and analyzed the test results. As a result, the optimal weather resistance and wear resistance improvement effect was shown at the ratio.

In the above, preferred embodiments according to the present invention have been shown and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by anyone having ordinary knowledge in the technical field to which the present invention belongs without departing from the gist of the present invention appended within the scope of the claims. .

100: Peripheral device operating device for walking traffic light using signal detection module
110: signal controller 111: signal driver
112: control unit 120: signal detection module
121: power supply unit 122: contradiction detection unit
123: time information processing unit 124: walking light state information generating unit
125: communication unit 126: control unit
1221: walking signal detection unit 1222: contradiction detection processing unit

Claims (6)

In the device for operating a walking traffic light peripheral device using a signal detection module that operates a peripheral device by additionally installing a signal detection module in an existing signal controller,
A signal controller supplying walking signals and AC power for operation of a plurality of walking traffic lights; and
Driving current applied to the plurality of walking signals is sensed, walking signal information is generated based thereon, walking remaining time information is generated based on the walking signal information, and walking signal information and walking remaining time information are transmitted through a communication network. A signal detection module provided to peripheral devices connected through; including,
The signal controller includes a signal driver having a plurality of connection terminals to which a control signal line for outputting control signals for controlling a plurality of walking traffic lights and an AC power line for supplying power are connected, and a first control unit for controlling the signal driver. consists of
The signal driver has a control signal line, an AC power line, a control board, and a connection terminal to which an additional driving unit can be assembled, and the connection terminal is one of PCB terminals to be directly assembled by a connector or soldering method,
The signal driver includes an AC relay for applying an AC voltage to a plurality of walking traffic lights and a latch for receiving a control signal from the first controller and applying a control signal to the AC relay,
The plurality of walking traffic lights include a first walking traffic light and a second walking traffic light,
The signal controller is connected to the first walking traffic light and the second walking traffic light through an AC power line,
The signal detection module
a power supply unit receiving power; a contradiction detecting unit for generating walking signal information of each walking signal light by measuring the drive current flowing through the AC power line, and performing a contradiction detection function of each walking signal light based on the walking signal information; a time information processor generating time information for a walking remaining time timer function; a communication unit transmitting the generated time information to the peripheral device through the communication network; And a second control unit for collecting state information of each component constituting the signal detection module and controlling an operation based thereon,
The contradiction detecting unit measures the drive current flowing through the AC power line and generates walking signal information of each walking signal light; And a contradiction detection processing unit for performing a contradiction detection function of each walking signal light based on the walking signal information,
The communication unit is connected to a peripheral device through a single communication network, and the communication unit converts and transmits an RS485 communication signal that can be interlocked with the peripheral device.
The signal detection module further includes a walking light state information generator for generating state information and operation information of each walking traffic light based on the information collected by the second control unit,
The peripheral device includes at least one of a numeric type remaining indicator, a voice guidance device, and a floor traffic light,
The contradiction detection unit has a CT (Current Transformer) connected to the AC power line to measure the driving (consumption) current of the walking traffic light,
The CT is formed in a ring shape, and the AC power line for driving the walking traffic light is installed by passing through the center of the ring-shaped CT. An induced current is generated in the ring-shaped CT surrounding the line to drive the primary side light emitting diode (LED) of the LED type photocoupler, and the secondary side photodiode (PD) drives the light emitting diode (LED). By detecting and generating a voltage of a certain size, it is determined whether the walking traffic light is lit,
The contradiction detecting unit includes an amplifying circuit for amplifying the CT-detected signal, a smoothing circuit for converting the amplified signal into a DC signal, and an A/D converter for converting the converted DC signal into a digital signal;
The contradiction detection unit determines whether the connection line to the walking traffic light is disconnected or shorted according to the signal from the CT, the traffic light contradiction state, etc. delete delete delete delete delete

Images