Circuit for realizing yellow flashing function of annunciator and traffic signal indication system

Abstract

The utility model relates to a circuit for realizing a yellow flashing function of a signal machine and a traffic signal indication system. The circuit comprises a communication branch, a microprocessor branch, a yellow flashing generation branch and a yellow flashing control branch which are connected in sequence, the input end of the communication branch serves as the input end of the circuit and is connected with a first communication interface, and the first communication interface is a communication interface between a main control board of the signal machine and a driving board of the signal machine; the output end of the yellow flash control branch serves as the output end of the circuit and is connected with a yellow lamp of the signal lamp. The output end of the microprocessor branch is also connected with the input end of the yellow flash control branch; wherein the connection comprises a communication connection and / or a physical connection. Based on the circuit for realizing the yellow flashing function of the annunciator, the signal lamp can be degraded to yellow flashing when the annunciator fails, so that the safety of an intersection is ensured to the maximum extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road traffic signal control, in particular to a circuit for realizing yellow flashing function of a signal machine and a traffic signal indication system. BACKGROUND

[0002] The traffic signal machine is a device for managing and controlling road traffic flow, which indicates the right of way of vehicles and pedestrians by controlling different combination states of red light, green light and yellow light. According to the national standard requirements, when the signal machine detects that there is an abnormality in the system, the signal light needs to be degraded to yellow flashing mode (i.e. the yellow light of the signal light is in flashing state).

[0003] However, the yellow flashing function of most manufacturers at present is realized by the signal machine, that is, the yellow flashing mode of the signal light is controlled by the phase output board of the signal machine itself. However, if the components of the signal machine itself fail, the signal light cannot be controlled to execute the yellow flashing mode by the signal machine. For example, when the main control board of the signal machine fails, the signal machine cannot detect the abnormal state of the remaining devices and cannot issue a yellow flashing processing command. For another example, when the drive board of the signal machine fails, the main control board detects that there is an abnormality in the system and issues a yellow flashing processing command, but the drive board cannot execute the command, so that the signal machine cannot output the yellow flashing mode, thereby causing traffic confusion and even traffic accidents. CONTENT OF THE INVENTION

[0004] In view of the above problems of the prior art, the present application provides a circuit for realizing yellow flashing function of a signal machine and a traffic signal indication system, which can degrade the signal light to yellow flashing mode when detecting that the signal machine, external cable and the like have abnormality, thereby maximizing the safety of the intersection.

[0005] To achieve the above purpose, the first aspect of the present application provides a circuit for realizing yellow flashing function of a signal machine, which is independent of the signal machine, and the circuit comprises: a communication branch, a microprocessor branch, a yellow flashing generation branch and a yellow flashing control branch connected in sequence; the input end of the communication branch is connected with a first communication interface as the input end of the circuit, and the first communication interface is a communication interface between the main control board of the signal machine and the drive board of the signal machine; the output end of the yellow flashing control branch is connected with the yellow light of the signal light as the output end of the circuit; the output end of the microprocessor branch is further connected with the input end of the yellow flashing control branch; wherein the connection includes communication connection and / or physical connection.

[0006] From the above, the present application realizes the monitoring of the communication data between the main control board and the driving board of the signal machine through the communication branch in the circuit, and when there is an abnormality, the yellow flashing branch and the yellow flashing control branch can be connected through the microprocessor branch, so that the yellow light of the signal lamp is in the flashing mode (i.e. yellow flashing mode) when the signal machine fails, thereby ensuring the traffic safety at the intersection.

[0007] As an implementation manner of the present application, the yellow flashing branch comprises: a photoelectric coupler, an anode of an input end of the photoelectric coupler is connected to a positive pole of a direct current output of a power supply branch through a first resistor, a cathode of the input end of the photoelectric coupler is connected to an output end of the microprocessor branch, an anode of an output end of the photoelectric coupler is connected to a fire wire of an alternating current output of the power supply branch through a second resistor, and a cathode of the output end of the photoelectric coupler is connected to an input end of the yellow flashing control branch through a third resistor; a thyristor, an anode of the thyristor is connected to the fire wire of the alternating current output of the power supply branch, a cathode of the thyristor is connected to the input end of the yellow flashing control branch, and a gate of the thyristor is connected to the cathode of the output end of the photoelectric coupler; and the thyristor is also connected in parallel with a fourth resistor.

[0008] From the above, through the cooperation of the photoelectric coupler, the thyristor and the microprocessor branch, the yellow flashing branch can output the flashing signal to realize the yellow flashing control.

[0009] As an implementation manner of the present application, the yellow flashing control branch comprises: a single-pole double-throw relay, a coil side of the single-pole double-throw relay is connected to the output end of the microprocessor branch, a first path of a switch side of the single-pole double-throw relay is connected to the output end of the yellow flashing branch and the yellow light of the signal lamp, and a second path of the switch side of the single-pole double-throw relay is connected to the yellow light control signal of the signal machine and the yellow light of the signal lamp.

[0010] From the above, through the single-pole double-throw relay, the first path can be turned on when a failure occurs, and the second path can be turned on when no failure is sent, so that the yellow light can normally operate when there is no failure, and the yellow light can operate in the yellow flashing mode when there is a failure.

[0011] As an implementation manner of the present application, the red and green light control branch further comprises: a single-pole double-throw relay, a coil side of the single-pole double-throw relay is connected to the output end of the microprocessor branch, a first path of a switch side of the single-pole double-throw relay is connected to the output end of the red and green light control branch and the red light of the signal lamp, and a second path of the switch side of the single-pole double-throw relay is connected to the red light control signal of the signal machine and the red light of the signal lamp.

[0012] As an implementation form of the present aspect, the traffic light control branch comprises: a first relay, a coil side of the first relay being connected to an output end of the microprocessor branch, and a switch side of the first relay being connected to a red light control signal of the signal machine and a red light of the signal light; and a second relay, a coil side of the second relay being connected to the output end of the microprocessor branch, and a switch side of the second relay being connected to a green light control signal of the signal machine and a green light of the signal light.

[0013] According to the above, through the first relay and the second relay, the red light and the green light can be normally operated by the signal machine when no fault occurs, and the connection between the traffic light and the signal machine control signal is disconnected when a fault occurs, so that the red light and the green light are not operated.

[0014] As an implementation form of the present aspect, the power supply branch is connected with the communication branch, the microprocessor branch, the yellow flash generation branch, the yellow flash control branch, and / or the traffic light control branch, and is used for converting input alternating current into alternating current or direct current suitable for each branch to supply power to the branches.

[0015] According to the above, through the power supply branch, target voltages can be provided for each branch.

[0016] As an implementation form of the present aspect, the communication branch comprises at least one of the following interfaces: an RS232 interface, an RS485 interface, a UART-TTL interface, and a CAN interface.

[0017] According to the above, through the communication interfaces, communication between the circuit for realizing the yellow flash function of the signal machine and the signal machine is realized, so that data can be transmitted into the circuit under normal conditions of the signal machine.

[0018] As an implementation form of the present aspect, the microprocessor branch drives the on-off state of the yellow flash generation branch through a PWM pulse signal.

[0019] As an implementation form of the present aspect, a duty cycle of the PWM pulse signal is 20% to 80%.

[0020] The second aspect of the present application provides a traffic signal indication system, comprising: a signal machine, the circuit for realizing the yellow flash function of the signal machine according to any one of the first aspect, and a signal light connected in sequence.

[0021] The beneficial effects of the present aspect can also be referred to the description of the beneficial effects of each part of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0022] The various technical features of the present application and the relationship between them will be further illustrated below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some technical features in the drawings can be omitted, which are conventional in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features are shown, which are not essential for understanding and implementing the present application. That is, the combination of various technical features shown in the drawings is not used to limit the present application. In addition, throughout the present application, the same reference signs refer to the same contents. The specific drawings are as follows:

[0023] Figure 1 A structural schematic diagram of a signal machine provided for the related art;

[0024] Figure 2 A structural schematic diagram of connecting the circuit for implementing the yellow flashing function of the signal machine to the traffic indication system provided for the embodiments of the present application;

[0025] Figure 3 A circuit schematic diagram of the yellow flashing branch in the circuit for implementing the yellow flashing function of the signal machine provided for the embodiments of the present application;

[0026] Figure 4 A waveform schematic diagram of a PWM pulse signal provided for the embodiments of the present application;

[0027] Figure 5 A flowchart of generating the waveform of the PWM pulse signal provided for the embodiments of the present application;

[0028] Figure 6 A circuit schematic diagram of the yellow flashing control branch in the circuit for implementing the yellow flashing function of the signal machine provided for the embodiments of the present application;

[0029] Figure 7 A circuit schematic diagram of the red and green light control branch in the circuit for implementing the yellow flashing function of the signal machine provided for the embodiments of the present application;

[0030] Figure 8 A control flowchart of the micro-processing branch in the circuit for implementing the yellow flashing function of the signal machine provided for the embodiments of the present application. DETAILED DESCRIPTION

[0031] The technical solutions provided by the present application will be further described below in combination with the drawings and embodiments. It should be understood that the system structure and business scenarios provided in the embodiments of the present application are mainly to illustrate possible implementation manners of the technical solutions of the present application, and should not be interpreted as the only limitation of the technical solutions of the present application. Those skilled in the art can know that the technical solutions provided by the present application are also applicable to similar technical problems with the evolution of system structure and the appearance of new business scenarios.

[0032] It should be understood that the embodiments of the present application provide a circuit solution for implementing the yellow flashing function of a traffic light. Because these technical solutions solve the same or similar problems, some repetitions may not be repeated in the following descriptions of the specific embodiments. However, these specific embodiments should be considered as having been referenced and can be combined with each other.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the art of this application. In the event of any inconsistency, the meaning described in this specification or the meaning derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit this application.

[0034] Before introducing the content of this application, first refer to Figure 1 Let's introduce the current connection between intersection signals and traffic lights. Figure 1 As shown, the signal machine 10 generally includes a power supply board 110, a main control board 120, and several drive boards 130. The power supply board 110 is used to convert the external 220V AC power into electrical energy that can be used by each board of the signal machine (such as the main control board, the drive board, etc.), such as AC-DC conversion, such as step-up and step-down conversion, etc. The main control board 120 is used to provide the control logic of the signal light. The drive board 130 is used to generate instructions for driving the corresponding signal light action according to the control logic issued by the main control board 120. The drive board 130 of the signal machine is connected to the signal light, and the signal light is used to perform corresponding actions according to the drive instructions of the drive board 130 to output indicator light states of different colors at different times. The drive board 130 of the signal machine can be directly connected to the signal light, or it can be connected to the signal light through Figure 1 The connection terminals T are shown. Each driver board 130 can drive one or more groups of signal lights.

[0035] The embodiments of the present application are described in detail below with reference to the accompanying drawings. First, the application scenario of the circuit for realizing the yellow flashing function of the traffic light provided by the embodiment of the present application is introduced. The circuit of the present application is independent of the traffic light and is an independent circuit for detecting faults of the traffic light itself and faults of external equipment connected to the traffic light (such as cables, signal lights, power modules, communication equipment, etc.). When any fault is detected, the signal light is output in a yellow flashing mode to serve as a warning. It should be understood that the solution of the present application can be applied to traffic indication systems that do not have a yellow flashing function in the prior art, that is, the circuit of the present application is connected between the traffic light and the signal light of the traffic indication system, so that it has a yellow flashing function; the solution of the present application can also be applied to traffic indication systems that integrate the yellow flashing function into the traffic light in the prior art, and similarly, the circuit of the present application is connected between the traffic light and the signal light, so that the yellow flashing function is independent of the traffic light.

[0036] It should be understood that the above application scenarios are exemplary descriptions and do not limit the scope of the application.

[0037] Embodiments of the present application provide a circuit for implementing a signal machine yellow flash function, which will be described in detail below in conjunction with the accompanying drawings. It should be noted that the "connection" between each branch, module, or device in the circuit for implementing a signal machine yellow flash function in the present application can be a physical connection relationship or a communication connection relationship.

[0038] First, refer to Figure 2 In the embodiment shown in Figure 2 The circuit 20 for implementing a signal machine yellow flash function provided by the present application is connected between the signal machine and the signal light, and the circuit 20 will be described in detail next. In this embodiment, the circuit 20 includes a communication branch 210, a microprocessor branch 220, a yellow flash generation branch 230, and a yellow flash control branch 240. Among them, the communication branch 210, the microprocessor branch 220, the yellow flash generation branch 230, and the yellow flash control branch 240 are connected in sequence. Next, each branch will be described in detail.

[0039] The input end of the communication branch 210 is connected with a first communication interface as the input end of the circuit 20, the first communication interface is a communication interface between the main control board of the signal machine and the driving board of the signal machine, and is used to receive data packets sent by the first port to realize communication between the signal machine and the circuit 20. The communication branch 210 can include one or more of an RS232 interface, an RS485 interface, a UART-TTL interface, and a CAN interface, and listens to the communication data between the main control board and the driving board of the signal machine through the above interfaces.

[0040] The input end of the microprocessor branch 220 is connected with the output end of the communication branch 210, and is used to receive the data listened to by the communication branch 210. The output end of the microprocessor branch 220 is connected with the yellow flash generation branch 230 and the yellow flash control branch 240. When the microprocessor branch 220 listens to the data and the following conditions occur, it is determined that a system failure has occurred, and the yellow flash function needs to be turned on, wherein turning on the yellow flash function includes sending a first control signal to the yellow flash generation branch 230 and sending a second control signal to the yellow flash control branch 240 to control the yellow flash function to be turned on (described below). It should be understood that the following fault types are common fault types and are exemplary descriptions, and other common fault types can also be included in other embodiments, which will not be listed one by one.

[0041] 1) The data on the communication branch 210 is interrupted, that is, no data can be listened to. This situation generally occurs when the main control board of the signal machine fails, for example, when the main control board crashes, at which time the signal machine cannot operate normally and cannot transmit data to the communication branch 210.

[0042] 2) The data packet monitored on the communication branch 210 does not change for more than a preset time, which can be set to 2-10 minutes. This situation usually occurs when the drive board of the signal machine fails. At this time, the main control board of the signal machine detects the failure of other devices (such as the line or the signal lamp), and outputs a yellow flashing signal through the drive board. However, due to the failure of the drive board, the yellow flashing signal cannot be normally driven, which will cause the data packet monitored by the communication branch 210 for a long time to not change.

[0043] The yellow flashing generation branch 230 is shown in Figure 3 The main devices of the yellow flashing generation branch 230 include a photoelectric coupler U1 and a silicon controlled rectifier U2. The anode of the input end of the photoelectric coupler U1 (i.e., pin 1 of the photoelectric coupler U1) is connected to a 3.3V DC power supply through a first resistor R1, the cathode of the input end of the photoelectric coupler U1 (i.e., pin 2 of the photoelectric coupler U1) is connected to the output end of the microprocessor branch 220, the anode of the output end of the photoelectric coupler U1 (i.e., pin 3 of the photoelectric coupler U1) is connected to the live wire L of the AC power supply through a second resistor R2, and the cathode of the output end of the photoelectric coupler U1 (i.e., pin 4 of the photoelectric coupler U1) is connected to the input end of the yellow flashing control branch 240 (i.e., FA shown in Figure 3 The anode of the silicon controlled rectifier U2 (i.e., pin 2 of the silicon controlled rectifier U2) is connected to the live wire L of the AC power supply, the cathode of the silicon controlled rectifier U2 (i.e., pin 1 of the silicon controlled rectifier U2) is connected to the input end of the yellow flashing control branch 240 (i.e., FA shown in Figure 3 The gate of the silicon controlled rectifier (i.e., pin 3 of the silicon controlled rectifier U2) is connected to the cathode of the output end of the photoelectric coupler U1 (i.e., pin 3 of the photoelectric coupler U1). In addition, a fourth resistor R4 is connected in parallel between the cathode and the anode of the silicon controlled rectifier U2. Thus, the yellow flashing generation branch 230 of the present application is formed.

[0044] In the present embodiment, the photoelectric coupler U1 can be selected as model MOC3063, and the silicon controlled rectifier U2 can be selected as model BTA16-800B. The resistance value of the first resistor R1 can be 50-100Ω, for example, 82Ω is selected in the present embodiment. The resistance value of the second resistor R2 can be 100-500Ω, for example, 360Ω is selected in the present embodiment. The resistance value of the third resistor R3 can also be 100-500Ω, for example, 360Ω is selected in the present embodiment. The fourth resistor R4 can be a pressure sensitive resistor, for example, the specification of the pressure sensitive resistor can be selected as 14D391K (i.e., the maximum continuous working voltage of the pressure sensitive resistor is 14V DC, the rated voltage of the pressure sensitive resistor is about 391V, and there is an error range of ±10%).

[0045] In the present embodiment, when the microprocessor branch 220 determines that a fault occurs, a first control signal is sent to the yellow flash generating branch 230, which is a PWM pulse signal (i.e. Figure 3 The CTLPWM at the cathode of the input end of the photoelectric coupler U1. The PWM pulse signal can be generated by a timer inside the microprocessor branch.

[0046] As an implementation manner, Figure 4 A waveform of a PWM pulse signal is shown, in which the duty cycle of the PWM pulse signal is 50% and the frequency is 1 Hz, that is, there are 500 ms (0.5 s) of high level and 500 ms of low level in 1 s.

[0047] In the present embodiment, when the cathode of the input end of the photoelectric coupler U1 of the yellow flash generating branch 230 receives a low level, it is turned on (since the anode of the input end of the photoelectric coupler U1 is connected to the 3.3V power supply, a path can be formed when the cathode of the input end inputs a low level), thereby triggering the silicon controlled rectifier to be turned on, so that the yellow flash generating branch 230 is in a path state; similarly, when the cathode of the input end of the photoelectric coupler U1 receives a high level, it is not turned on (since both the anode and the cathode of the input end of the photoelectric coupler U1 are high levels, the photoelectric coupler is cut off at this time), thereby the silicon controlled rectifier is in a cut-off state, so that the yellow flash generating branch 230 is in a cut-off state. Based on the above PWM pulse signal, the silicon controlled rectifier can generate a signal with a bright-dark ratio of 500 ms:500 ms (i.e. a flash signal), and output the signal to the yellow flash control branch 240. It should be understood that in different cases, different PWM waveforms can be set to output driving signals with different lengths of bright-dark ratio, for example, in some embodiments, the duty cycle of the PWM pulse signal can be 20% to 80%.

[0048] As Figure 5 A flowchart for generating a PWM pulse signal with a duty cycle of 50% and a frequency of 1 Hz by a timer inside the microprocessor branch is shown. It should be understood that generating a PWM pulse signal is a conventional technology. In the present embodiment, the timer is first started, and the target PWM signal is generated by counting the timer and taking the remainder of the count value. Specifically, the timer counts 1 every 500 ms, and the count value of the timer count is count = count + 1, i.e. the count value is increased by 1 every 500 ms, and then the calculation value count is taken as the remainder of 1, i.e. Figure 5In the case of count%2=1, the PWM corresponds to low level in the case of remainder result being 1, and the PWM corresponds to high level in the case of remainder result not being 1. Through the above process, that is, in the case of odd number of count value, the PWM outputs low level signal, and in the case of even number of count value, the PWM outputs high level signal, thereby generating the PWM signal with 50% duty cycle and 1Hz frequency.

[0049] The yellow flash control branch 240 is as shown in Figure 6 The yellow flash control branch 240 includes a single-pole double-throw relay K, the coil side of the single-pole double-throw relay K is connected to the output end of the microprocessor branch 220, the first path of the switch side of the single-pole double-throw relay K is used to connect the output end of the yellow flash generation branch 230 and the yellow lamp of the signal lamp, and the second path of the switch side of the single-pole double-throw relay K is used to connect the yellow lamp control signal of the signal machine (the signal is sent by the driving board of the signal machine) and the yellow lamp of the signal lamp.

[0050] In the normal operation state, the second path of the single-pole double-throw relay K is connected, that is, the yellow lamp of the signal lamp is driven to normally operate by sending the yellow lamp control signal by the signal machine; when a certain device fails, the second control signal sent by the microprocessor branch 220 is received by the coil side of the single-pole double-throw relay K, so that the switch of the single-pole double-throw relay K is switched to the state of the first path being connected, that is, the yellow lamp of the signal lamp is driven to operate in the yellow flash mode by the flash signal sent by the yellow flash generation branch 230.

[0051] In some embodiments, the circuit 20 can further include a red-green lamp control branch 250. As an implementation manner, as shown in Figure 7 The red-green lamp control branch 250 can include a first relay K1 and a second relay K2, wherein the coil side of the first relay K1 is connected to the output end of the microprocessor branch 220, and the switch side of the first relay K1 is connected to the red lamp control signal of the signal machine (the signal is sent by the driving board of the signal machine) and the red lamp of the signal lamp. The coil side of the second relay K2 is connected to the output end of the microprocessor branch 220, and the switch side of the second relay K2 is connected to the green lamp control signal of the signal machine (the signal is sent by the driving board of the signal machine) and the green lamp of the signal lamp.

[0052] In the normal operation state, the first relay K1 and the second relay K2 realize on-off control according to the red-green lamp driving signal of the signal machine, thereby realizing control of the red lamp and the green lamp; when a certain device fails, the microprocessor branch 220 sends the third control signal to the red-green lamp control branch 250, so that the first relay K1 and the second relay K2 are both disconnected, that is, neither the red lamp on signal nor the green lamp on signal is output, and the yellow lamp is output in the yellow flash mode by controlling the yellow flash generation branch 230 and the yellow flash control branch 240.

[0053] In some embodiments, the circuit 20 can further comprise a power supply branch 260 connected with the communication branch 210, the microprocessor branch 220, the yellow flash generating branch 230, the yellow flash control branch 240, and / or the red light control branch 240 respectively, for converting the AC input into AC or DC suitable for each branch, i.e. the input of the power supply branch 260 is 220V AC, and the output of the power supply branch 260 is the target power for each branch, and the power supply branch 260 can perform AC-DC conversion, voltage step-up or step-down conversion, etc.

[0054] In order to more clearly understand the control flow of the microprocessor branch 220, the following further discusses in combination with the flowchart shown in Figure 8 Firstly, the microprocessor branch detects whether there is an abnormality in the signal machine, and the implementation of this step can refer to the fault detection part of the above embodiment. It should be understood that the fault detection herein is prior art, for example, the above embodiment provides a method of judging by monitoring the data packet of the communication branch. When it is detected that there is an abnormality (fault), the "Yes" branch shown in Figure 8 is taken, at this time, the first relay K1 and the second relay K2 of the red light control branch 250 are both disconnected, then the single-pole double-throw relay K of the yellow flash control module 240 is switched to the first path conduction by the second control signal, and the yellow flash generating module 230 outputs the flash signal by the first control signal, so that the yellow light of the signal lamp outputs the yellow flash mode. When it is detected that there is no abnormality (fault), the "No" branch shown in Figure 8 is taken, at this time, the first relay K1 and the second relay K2 of the red light control branch 250 are controlled to be connected or disconnected based on the driving signal of the signal machine, to realize the normal output of the red and green lights of the signal lamp, in addition, the single-pole double-throw relay K of the yellow flash control module 240 is in the second path conduction, and the driving signal sent by the signal machine is used to control the change of the yellow light.

[0055] Based on the circuit for realizing the yellow flash function of the signal machine provided in the embodiments of the present application, the output state of the signal machine is monitored by the circuit independent of the signal machine, so as to judge whether the signal machine has an abnormality, and the abnormal state of the signal machine can be detected in time, and when the signal machine has an abnormality, the signal lamp outputs the yellow flash mode, so as to maximize the safety of the intersection.

[0056] Another embodiment of the present application provides a traffic signal indication system, which comprises a signal machine, the circuit for realizing the yellow flash function of the signal machine provided in the above embodiments, and a signal lamp connected in sequence. By connecting the circuit independently between the signal machine and the signal lamp, the fault of the signal machine can be detected, so as to ensure that the signal lamp outputs in the yellow flash mode when the signal machine has a fault, and the safety of the intersection is ensured.

[0057] It is to be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the application. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. In a claim, the word "a" or "an" preceding the commencement of the recitation of a list of elements or steps does not exclude the presence of more than one of such element or step. It is appreciated that features of the application that are, at this time, considered characteristic of the invention can be incorporated in other embodiments without considering them to form a new separate invention.

Claims

1. A circuit for realizing the yellow flashing function of a signal light, characterized in that: The circuit is independent of the signal machine, and includes: The communication branch, microprocessor branch, yellow flash generation branch and yellow flash control branch are connected in sequence; The input end of the communication branch serves as the input end of the circuit and is connected to a first communication interface, which is a communication interface between the main control board of the signal light and the driver board of the signal light. The output end of the yellow flash control branch serves as the output end of the circuit and is connected to the yellow light of the signal light. The output end of the microprocessor branch is also connected to the input end of the yellow flash control branch; The connection includes a communication connection and / or a physical connection.

2. The circuit according to claim 1, wherein: The yellow flash occurrence branch includes: A photoelectric coupler, wherein an anode of the photoelectric coupler input end is connected to the positive electrode of the DC output of the power supply branch via a first resistor, a cathode of the photoelectric coupler input end is connected to the output end of the microprocessor branch, an anode of the photoelectric coupler output end is connected to the live wire of the AC output of the power supply branch via a second resistor, and a cathode of the photoelectric coupler output end is connected to the input end of the yellow flash control branch via a third resistor; A thyristor, wherein the anode of the thyristor is connected to the live wire of the AC output of the power supply branch, the cathode of the thyristor is connected to the input end of the yellow flash control branch, and the gate of the thyristor is connected to the cathode of the output end of the photocoupler; the thyristor is also connected in parallel with a fourth resistor.

3. The circuit according to claim 1, wherein: The yellow flash control branch includes: A single-pole double-throw relay, wherein the coil side of the single-pole double-throw relay is connected to the output end of the microprocessor branch, the first path of the single-pole double-throw relay switch side is connected to the output end of the yellow flash generating branch and the yellow light of the signal light, and the second path of the single-pole double-throw relay switch side is connected to the yellow light control signal of the signal machine and the yellow light of the signal light.

4. The circuit according to claim 1, wherein: Also includes: A traffic light control branch, wherein an input end of the traffic light control branch is connected to the red light control signal and the green light control signal of the traffic light, and an output end of the traffic light control branch is connected to the red light and the green light of the traffic light; The input end of the traffic light control branch is also connected to the output end of the microprocessor branch.

5. The circuit according to claim 4, characterized in that The traffic light control branch includes: a first relay, wherein a coil side of the first relay is connected to an output end of the microprocessor branch, and a switch side of the first relay is connected to a red light control signal of the signal machine and a red light of the signal light; The second relay, the second relay coil side is connected to the output end of the microprocessor branch, and the second relay switch side connects the green light control signal of the signal machine and the green light of the signal light.

6. The circuit according to claim 5, characterized in that Also includes: A power supply branch, wherein the power supply branch is respectively connected to the communication branch, the microprocessor branch, the yellow flash generation branch, the yellow flash control branch, and / or the traffic light control branch, and is used to convert the input AC power into AC power or DC power suitable for each branch to power each branch.

7. The circuit according to claim 1, wherein: The communication branch includes at least one of the following interfaces: RS232 interface, RS485 interface, UART-TTL interface, and CAN interface.

8. The circuit according to claim 2, characterized in that Also includes: The microprocessor branch drives the on / off state of the yellow flash generating branch through a PWM pulse signal.

9. The circuit according to claim 8, characterized in that The duty cycle of the PWM pulse signal is 20% to 80%.

10. A traffic signal indication system, characterized in that: include: A signal light, a circuit for realizing the yellow flashing function of a signal light as described in any one of claims 1 to 9, and a signal light connected in sequence.

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