Lamp control board and traffic signal controller

Abstract

The present application discloses a lamp control board and a traffic signal controller. The lamp control board includes: a lamp control processor for receiving an external signal and controlling the on / off of each unit lamp in the signal lamp according to the external signal; a target detection circuit including an optocoupler for detecting the voltage / current of the unit lamp. When the voltage / current of the unit lamp reaches the current threshold value of the optocoupler, the optocoupler switches its state, thereby sending a trigger signal to the lamp control processor; a temperature detection circuit for detecting the temperature of the lamp control board; and a drive control circuit connected to the temperature detection circuit and the target detection circuit for compensating the current threshold value of the optocoupler according to the temperature detected by the temperature detection circuit to ensure that the current threshold value of the optocoupler does not exceed a preset range with the change of temperature. The lamp control board provided by the present application can ensure the reliable stability of the traffic signal lamp.

Description

Technical Field

[0001] This application relates to the technical field of traffic signal controllers, and particularly to a lamp control board and a traffic signal controller. Background Art

[0002] With the development of society, traffic problems have become important factors in economic and social development. Therefore, traffic signal controllers are an indispensable tool for contemporary traffic control and a key device for reducing traffic accidents. Traffic signal controllers are mainly installed near each intersection and control the operation timing of red, yellow, and green lights in real time or fixedly according to the traffic flow at the intersection. Therefore, traffic signal controllers have become increasingly important, and their working stability and system reliability are crucial. However, the stability of current traffic signal controllers needs to be further improved. Summary of the Invention

[0003] This application provides a lamp control board and a traffic signal controller, which can ensure the reliable stability of the traffic signal controller.

[0004] In a first aspect of an embodiment of this application, a lamp control board is provided. The lamp control board includes: a lamp control processor for receiving an external signal and controlling the on / off of each unit lamp in the signal lamp according to the external signal; a target detection circuit including an optocoupler for detecting the voltage / current of the unit lamp. When the voltage / current of the unit lamp reaches the current threshold value of the optocoupler, the optocoupler switches its state, thereby sending a trigger signal to the lamp control processor; a temperature detection circuit for detecting the temperature of the lamp control board; and a drive control circuit connected to the temperature detection circuit and the target detection circuit for compensating the current threshold value of the optocoupler according to the temperature detected by the temperature detection circuit to ensure that the current threshold value of the optocoupler does not exceed a preset range with the change of temperature.

[0005] In a second aspect of an embodiment of this application, a traffic signal controller is provided. The traffic signal controller includes a signal lamp and the lamp control board according to any one of the above.

[0006] The beneficial effect is that in the lamp control board of this application, the temperature detection circuit is used to detect the temperature of the lamp control board, and the drive control circuit is used to compensate the current threshold value of the optocoupler according to the temperature detected by the temperature detection circuit to ensure that the current threshold value of the optocoupler does not exceed a preset range with the change of temperature, avoiding misjudgment caused by a large deviation of the judgment threshold at high or low temperatures. Brief Description of the Drawings

[0007] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings, where:

[0008] Figure 1 is a schematic structural diagram of an embodiment of a traffic signal controller of the present application;

[0009] Figure 2 is Figure 1 a schematic connection structure diagram of the lamp control board and the signal lamp in;

[0010] Figure 3 is Figure 1 a logic diagram of the traffic signal controller;

[0011] Figure 4 is Figure 2 a partial structural diagram of the lamp control board;

[0012] Figure 5 is a schematic diagram of the relative positions of each single board in the traffic signal controller of the present application;

[0013] Figure 6 is a summary diagram of the automation verification scheme of the traffic signal controller of the present application. Specific Embodiments

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0015] It should be noted that the terms "first" and "second" in the present application are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0016] Refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the traffic signal controller of the present application. The traffic signal controller 10 includes a main power supply 11, a backup power supply 12, a main power supply board 13, a backup power supply board 14, a main control board 15, a backup main control board 16, a lamp control board 17, a yellow flashing board 18, and signal lamps 19.

[0017] The main power supply 11 supplies power to the entire traffic signal controller 10. The backup power supply 12 is a backup power supply for the main power supply 11. When the main power supply 11 fails, the backup power supply 12 quickly takes over the power supply task to supply power to the entire traffic signal controller 10, thereby continuing to maintain the traffic order at the intersection and ensuring traffic safety. Among them, the main power supply 11 is a commercial power module, and the backup power supply 12 can be a UPS power supply.

[0018] The main power supply board 13 is connected to the main power supply 11 and is used to convert the alternating current output by the main power supply 11 into direct current. Among them, the backup power supply board 14 serves as a backup for the main power supply board 13. When the main power supply board 13 fails, the backup power supply board 14 replaces the main power supply board 13 to work.

[0019] The main control board 15 is the central brain of the entire traffic signal controller 10 and is responsible for controlling and communicating with other modules. The backup main control board 16 serves as a backup for the main control board 15. When the main control board 15 fails, the backup main control board 16 replaces the main control board 15 to work. Among them, the main control board 15 and the backup main control board 16 are completely identical in terms of hardware and software. Both are powered on and run simultaneously, and communicate with each other through a serial port to synchronize the running configuration and scheme at all times.

[0020] That is to say, the main power supply 11 and the backup power supply 12 form a pair of main and backup devices, the main power supply board 13 and the backup power supply board 14 form a pair of main and backup devices, and the main control board 15 and the backup main control board 16 form a pair of main and backup devices. For any pair of main and backup devices, when both the main device and the backup device are normal, it is preferred that the main device works. Only when the main device fails, the backup device will replace the main device to work. Specifically, when the main device has an abnormality (such as crashing), the survival detection circuit on the main device will output a low signal to cut off all output signal paths on the main device. At the same time, the survival detection circuit on the backup device outputs a high signal to turn on all output signal paths on the backup device, so as to ensure that the backup device can achieve seamless switching when the main device is abnormal and can ensure that the programs are exactly the same, thereby improving the reliability of the operation of the traffic signal controller 10.

[0021] Among them, the external control and communication interfaces between the main device and the backup device are designed with hardware mutual exclusion to ensure that the two will not output simultaneously. The hardware mutual exclusion design can be implemented by using a 245 logic chip + an inverter. The present application does not limit the specific implementation manner of the hardware mutual exclusion design.

[0022] The lamp control board 17 is connected to the main control board 15. At the same time, the main control board 15 is also connected to the signal lamp 19. The main control board 15 receives the driving signal sent by the main control board 15 and controls the on / off of each unit lamp in the signal lamp 19 according to the driving signal. Among them, the signal lamp 19 can include multiple unit lamps. The unit lamp can be a round lamp or an arrow lamp. For example, when the traffic signal machine 10 is set corresponding to an intersection, the signal lamp 19 can include 12 unit lamps. These 12 unit lamps specifically include 4 red round unit lamps, 4 yellow round unit lamps, and 4 green round unit lamps.

[0023] The signal lamp 19 operates normally under the drive of the lamp control board 17, so as to maintain the traffic order at the intersection and ensure traffic safety.

[0024] Combined with Figure 2 , the lamp control board 17 includes a lamp control processor 171, a target detection circuit 172, and a first switch driving circuit 173. Among them, the lamp control processor 171 is used to receive the driving signal sent by the main control board 15 and drive the on / off of each unit lamp through the first switch driving circuit 173 according to the driving signal. Among them, the target detection circuit 172 is connected to the first switch driving circuit 173 and the lamp control processor 171. The target detection circuit 172 includes an optocoupler and is used to detect the voltage / current of the unit lamp. When the voltage / current of the unit lamp reaches the current threshold value of the optocoupler, the optocoupler switches its state, thereby sending a trigger signal to the lamp control processor 171. Among them, for the specific introduction of the lamp control board 17, see the following text. At the same time, for the convenience of explanation, in Figure 1 the first switch driving circuit 173 is separated from the lamp control board 17.

[0025] Among them, in order to further improve the stability of the traffic signal machine 10, the present application also sets a yellow flashing board 18. When the main control board 15 and the backup main control board 16 both have abnormalities, or because the main power board 13 and the backup power board 14 both have abnormalities, or because the lamp control board 17 has an abnormality and causes the lamp control board 17 to be unable to drive the signal lamp 19 to operate normally, the yellow flashing board 18 drives the signal lamp 19 to work in the yellow flashing mode. At this time, the signal lamp 19 presents a yellow flashing state under the drive of the yellow flashing board, ensuring the slow-down reminder function at the traffic intersection, and still being able to guarantee the safety of the traffic intersection and meet the high reliability requirements of the traffic signal machine 10.

[0026] Among them, for the convenience of explanation, the part that controls the signal lamp 19 except the yellow flashing board 18 is called the main control system.

[0027] Continue to refer to Figure 1 , the yellow flashing board 18 includes a power module 181, a yellow flashing processor 182, a second switch driving circuit 183, and a first logic switching circuit 184.

[0028] The power supply module 181 is connected to the main power supply 11 and is used to convert the alternating current output by the main power supply 11 into direct current. If an abnormality occurs in the power supply module 181, the yellow flashing board 18 cannot operate normally either, so that the signal lamp 19 cannot work in the yellow flashing mode.

[0029] The yellow flashing processor 182 is connected to the power supply module 181 and is communicatively connected to the main control board 15. Among them, the yellow flashing processor 182 is the core of the yellow flashing board 18, which is responsible for communicating with the main control board 15, obtaining the information output by the main control board 15, and controlling the output according to this information.

[0030] The second switch driving circuit 183 is connected to the yellow flashing processor 182. The yellow flashing processor 182 drives the signal lamp 19 to work in the yellow flashing template through the second switch driving circuit 183; the first logic switching circuit 184 is connected to the first switch driving circuit 173, the second switch driving circuit 183, and the signal lamp 19 at the same time. When the main control board 15 and the backup main control board 16 both have abnormalities, or because the main power supply board 13 and the backup power supply board 14 both have abnormalities, or because the lamp control board 17 has an abnormality and causes the lamp control board 17 to be unable to drive the signal lamp 19 to operate normally, the first logic switching circuit 184 connects the second switch driving circuit 183 and the signal lamp 19, and disconnects the connection between the first switch driving circuit 173 and the signal lamp 19.

[0031] Specifically, under normal circumstances, the first logic switching circuit 184 connects the first switch driving circuit 173 and the signal lamp 19. At this time, the signal lamp 19 operates normally. However, when it is determined to start the yellow flashing board 18, the first logic switching circuit 184 disconnects the connection between the first switch driving circuit 173 and the signal lamp 19, and connects the second switch driving circuit 183 and the signal lamp 19. At this time, the signal lamp 19 works in the yellow flashing mode.

[0032] Among them, the first switch driving circuit 173 and the second switch driving circuit 183 can be thyristor driving circuits, and the present application does not limit the structures of the first switch driving circuit 173 and the second switch driving circuit 183.

[0033] Among them, considering that the yellow flashing processor 182 in the yellow flashing board 18 may also have an abnormality, in order to further improve the reliability of the traffic signal machine 10 at this time, continue to refer to Figure 1 , the yellow flashing board 18 further includes a pure hardware square wave generating circuit 185 and a second logic switching circuit 186.

[0034] The pure hardware square wave generation circuit 185 is connected to the yellow flashing processor 182 and the main control board 15; the second logic switching circuit 186 is connected to the yellow flashing processor 182, the pure hardware square wave generation circuit 185 and the second switch driving circuit 183 at the same time. When the lamp control board 17 fails to drive the signal lamp 19 to operate normally and the yellow flashing processor 182 malfunctions, the second logic switching circuit 186 connects the pure hardware square wave generation circuit 185 and the second switch driving circuit 183 and disconnects the connection between the yellow flashing processor 182 and the second switch driving circuit 183, so that the signal output by the pure hardware square wave generation circuit 185 drives the signal lamp 19 to work in the yellow flashing mode.

[0035] Specifically, when the yellow flashing board 18 takes over the signal lamp 19, if the yellow flashing processor 182 also malfunctions, the pure hardware survival detection circuit (including components such as buffers, capacitors, inverters, etc.) between the yellow flashing processor 182 and the pure hardware square wave generation circuit 185 will output a high signal. At the same time, the detection circuit between the pure hardware square wave generation circuit 185 and the main control board 15 will also detect whether the main control system is abnormal. If the main control system also malfunctions, the second logic switching circuit 186 will disconnect the connection between the yellow flashing processor 182 and the second switch driving circuit 183, but connect the pure hardware square wave generation circuit 185 and the second switch driving circuit 183. At this time, the pure hardware square wave generation circuit 185 outputs a pure hardware driving signal to drive the signal lamp 19 to work in the yellow flashing mode through the second switch driving circuit 183. Among them, the pure hardware square wave generation circuit 185 can be a pure hardware square wave generation circuit with a frequency of 0.1Hz to 100KHz. And the pure hardware square wave generation circuit 185 can include a hysteresis comparator and an RC circuit, and the specific structure of the pure hardware square wave generation circuit 185 is not limited. Through the design of the pure hardware square wave generation circuit 185, it can be ensured that when the yellow flashing processor 182 fails, the signal lamp 19 can still work in the yellow flashing mode, thereby further improving the reliability of the traffic signal machine 10.

[0036] Among them, when the yellow flashing board 18 drives the signal lamp 19, both the input channel and the output channel of the lamp control board 17 are switched by the yellow flashing board 18.

[0037] The yellow flashing board 18 further includes an isolation element 187 disposed between the second logic switching circuit 186 and the second switch driving circuit 183. The isolation element 187 is used for signal isolation, and the isolation element 187 can be an optocoupler.

[0038] It should be noted that in other embodiments, the backup power supply 12 may not be provided as a backup for the main power supply 11, or the backup power supply board 14 may not be provided as a backup for the main power supply board 13, or the backup main control board 16 may not be provided as a backup for the main control board 15, or the yellow flashing board 18 may not be provided, or the yellow flashing board 18 may be provided, but the pure hardware square wave generation circuit 185 is not provided.

[0039] The following will further describe the traffic signal controller 10 in Figure 3 combination with the Figure 1 logic diagram:

[0040] First, after power-on, the main power supply 11 is preferentially used for power supply. If the main power supply 11 fails, the backup power supply 12 is used for power supply. If the backup power supply 12 also fails, the entire traffic signal controller 10 cannot work properly.

[0041] If one of the main power supply 11 and the backup power supply 12 can work, it is first determined whether the main power supply board 13 works properly. If the main power supply board 13 does not work properly, the backup power supply board 14 is started. If the backup power supply board 14 also cannot work properly, the yellow flashing board 18 is started.

[0042] If one of the main power supply board 13 and the backup power supply board 14 can work, it is first determined whether the main control board 15 works properly. If the main control board 15 does not work properly, the backup main control board 16 is started. If the backup main control board 16 also cannot work properly, the yellow flashing board 18 is started.

[0043] If one of the main control board 15 and the backup main control board 16 can work properly, it is determined whether the lamp control board 17 can work properly. If it can work properly, the lamp control board 17 drives the signal lamp 19 to work properly. If the lamp control board 17 cannot work properly, the yellow flashing board 18 is started.

[0044] If the power supply module 181 in the yellow flashing board 18 cannot work properly, the signal lamp 19 cannot display. If the power supply module 181 can display normally, the input and output of the lamp control board 17 are cut off, and it is determined whether the yellow flash processor 182 can work properly. If the yellow flash processor 182 can work properly, the yellow flash processor 182 drives the signal lamp 19 to be in the yellow flash mode through the second switch drive circuit 183. If the yellow flash processor 182 cannot work properly, the pure hardware square wave generation circuit 185 starts to work, and its output square wave drives the signal lamp 19 to be in the yellow flash mode through the second switch drive circuit 183.

[0045] The following will further describe in Figure 2Continue to introduce the lamp control board 17. In addition to including a lamp control processor 171, a target detection circuit 172, and a first switch drive circuit 173, the lamp control board 17 further includes a temperature detection circuit 175 and a drive control circuit 176.

[0046] The target detection circuit 172 includes an optocoupler for detecting the voltage / current of the unit lamp. When the voltage / current of the unit lamp reaches the current threshold value of the optocoupler, the optocoupler switches its state, thereby sending a trigger signal to the lamp control processor 171. The target detection circuit 172 is connected to the first switch drive circuit 173 and is used to collect the voltage / current of the unit lamp. When the voltage / current of the unit lamp reaches the current threshold value of the optocoupler, the optocoupler switches its state and sends a trigger signal to the lamp control processor 171. Subsequently, the lamp control processor 171 can send this trigger signal to the main control board 15. Then, based on this trigger signal, the main control board 15 determines the state of the corresponding unit lamp.

[0047] Meanwhile, the target detection circuit 172 further includes a rectifying circuit (including rectifying diodes) and a voltage dividing circuit provided at the front end of the optocoupler.

[0048] In this embodiment, one target detection circuit 172 can only detect the voltage / current of one unit lamp. When it is necessary to detect the voltage / current of each unit lamp, a target detection circuit and a drive control circuit 176 need to be provided for each unit lamp. For the convenience of explanation, the following will illustrate the detection of the voltage / current of a single unit lamp.

[0049] Among them, when it is necessary to compensate the optocouplers in multiple target detection circuits 172 in the same lamp control board 17, since they are at the same temperature, only one temperature detection circuit 175 can be set. Thus, different drive control circuits 176 compensate the optocouplers in the corresponding target detection circuits 172 according to the temperature detected by the same temperature detection circuit 175.

[0050] Among them, due to the temperature characteristics of the optocoupler itself, at high or low temperatures, there is a problem of a large deviation in the judgment threshold, which may cause misjudgment. That is to say, at different temperatures, the optocoupler switches its state at different threshold values. Therefore, this application provides a temperature detection circuit 175 and a drive control circuit 176.

[0051] The temperature detection circuit 175 is used to detect the temperature of the lamp control board 17; the drive control circuit 176 is connected to the temperature detection circuit 175 and the target detection circuit 172 and is used to compensate the current threshold value of the optocoupler according to the temperature detected by the temperature detection circuit 175 to ensure that the current threshold value of the optocoupler does not exceed the preset range with the change of temperature.

[0052] Specifically, after the temperature detection circuit 175 detects the current temperature, the drive control circuit 176 compensates the current threshold value of the optocoupler according to the current temperature, thereby reducing the offset of the threshold value of the optocoupler with temperature. That is to say, regardless of how the temperature of the current lamp control board 17 changes, the optocoupler always switches states at the same threshold value or near the same threshold value. Among them, the preset range can be designed by the designer, and this application does not make any restrictions.

[0053] Among them, the temperature detection circuit 175 may include a temperature sensor chip or an NTC / PTC thermistor, and this application does not limit the specific structure of the temperature detection circuit 175.

[0054] Refer to Figure 4 , among which, the drive control circuit 176 includes a drive controller 1761 and a temperature compensation sub-circuit 1762.

[0055] The drive controller 1761 is connected to the temperature detection circuit 175; the number of temperature compensation sub-circuits 1762 is multiple, and multiple temperature compensation sub-circuits 1762 are all connected to the drive controller 1761 and the target detection circuit 172. Among them, the drive controller 1761 is used to turn on the matching temperature compensation sub-circuit 1762 to compensate the optocoupler according to the temperature detected by the temperature detection circuit 175.

[0056] Specifically, multiple temperature segments can be preset, and multiple temperature segments correspond to multiple temperature compensation sub-circuits 1762 one by one. After the temperature detection circuit 175 detects the current temperature, determine the temperature segment where the current temperature is located, and then turn on the temperature compensation sub-circuit 1762 corresponding to the temperature segment to compensate the optocoupler.

[0057] In this embodiment, the target detection circuit 172 further includes a primary resistor connected in series on the primary side of the optocoupler and a secondary resistor connected in series on the secondary side of the optocoupler; the temperature compensation sub-circuit 1762 includes: a first switching tube and a first resistor, the control end of the first switching tube is connected to the drive controller 1761, and when the drive controller 1761 turns on the first temperature compensation sub-circuit, the first switching tube switches its state to parallel the first resistor with the primary resistor; and / or, a second switching tube and a second resistor, the control end of the second switching tube is connected to the drive controller 1761, and when the drive controller 1761 turns on the first temperature compensation sub-circuit, the second switching tube switches its state to series the second resistor with the secondary resistor.

[0058] Specifically, if it is desired to connect a first resistor in parallel with the primary resistor after turning on the matched temperature compensation sub-circuit 1762, the drive controller 1761 needs to control the first switch to switch its state. If it is desired to connect a second resistor in series with the secondary resistor after turning on the matched temperature compensation sub-circuit 1762, the drive controller 1761 needs to control the second switch to switch its state.

[0059] The temperature compensation sub-circuit 1762 may only include the first switch and the first resistor. In this case, after the drive controller 1761 turns on the temperature compensation sub-circuit 1762 through the first switch, the first resistor is connected in parallel with the primary resistor. The temperature compensation sub-circuit 1762 may also only include the second switch and the second resistor. In this case, after the drive controller 1761 turns on the temperature compensation sub-circuit 1762 through the second switch, the second resistor is connected in series with the secondary resistor. The temperature compensation sub-circuit 1762 may also include the first switch, the first resistor, the second switch, and the second resistor at the same time. In this case, after turning on the temperature compensation sub-circuit 1762, either the first resistor can be connected in parallel with the primary resistor or the second resistor can be connected in series with the secondary resistor.

[0060] The number of the target detection circuits 172 may be one or two. When the number of the target detection circuits 172 is one, the target detection circuit 172 is used to detect the voltage or current of the unit lamp. When the number of the target detection circuits 172 is two, one can be used to detect the voltage of the unit lamp, and the other can be used to detect the current of the unit lamp. Hereinafter, the case where the number of the target detection circuits 172 is two will be described, and the two target detection circuits 172 are defined as a voltage detection circuit 172A and a current detection circuit 172B. The voltage detection circuit 172A is used to detect the voltage of the unit lamp, and the current detection circuit 172B is used to detect the current of the unit lamp.

[0061] Among them, the drive control circuits 176 correspond one-to-one with the target detection circuits 172. The drive control circuit 176 compensates the optocoupler in the corresponding target detection circuit 172 according to the temperature detected by the temperature detection circuit 175. Therefore, when the number of target detection circuits 172 is two, the number of drive control circuits 176 is also two. The two drive control circuits 176 correspond one-to-one with the two target detection circuits 172. Among them, the drive control circuit 176 corresponding to the voltage detection circuit 172A is defined as the first drive control circuit 176A, and the drive control circuit 176 corresponding to the current detection circuit 172B is defined as the second drive control circuit 176B. That is to say, the first drive control circuit 176A compensates the optocoupler in the voltage detection circuit 172A according to the temperature detected by the temperature detection circuit 175, and the second drive control circuit 176B compensates the optocoupler in the current detection circuit 172B according to the temperature detected by the temperature detection circuit 175.

[0062] In order to better understand the above-mentioned target detection circuit 172, the following is an illustration with examples:

[0063] In this example, the temperature is divided into the following temperature segments: 0 - 50°C, -40°C - -20°C, -20°C - 0°C, 50°C - 70°C, 70°C - 90°C, and 90°C - 110°C. Among them, when the temperature exceeds 110°C, the optocoupler is used beyond its specification, and abnormal working conditions will occur, so compensation is not considered.

[0064] At the same time, in this example, in the voltage detection circuit 172A, the primary side of the optocoupler is in series with a primary side resistor with a resistance value of 330 KΩ, and the secondary side is in series with a secondary side resistor with a resistance value of 47 KΩ; in the current detection circuit 172B, the primary side of the optocoupler is in series with a primary side resistor with a resistance value of 220 Ω, and the secondary side is in series with a secondary side resistor with a resistance value of 47 KΩ.

[0065] When the current temperature is in the range of 0 - 50°C, for the voltage detection circuit 172A, the maximum value range of the optocoupler CTR is 130% - 286%, CTR = IC / IF * 100%, IC = 44 uA, IF = 110 uA, which meets the requirements and has a large enough margin; for the current detection circuit 172B, the maximum value range of the optocoupler CTR is 130% - 286%, CTR = IC / IF * 100%, IC = 53 uA, IF = 122 uA, which meets the requirements and has a large enough margin. Therefore, at this time, it is not necessary to compensate the optocouplers in the voltage detection circuit 172A and the second target electrical measurement circuit. At the same time, for the convenience of explanation, 0 - 50°C is defined as the normal gear.

[0066] When the current temperature is between -40°C and -20°C, compared with the normal gear, as the temperature decreases, the maximum value of the CTR of the optocoupler increases, and the secondary side current is easier to drive. The main influencing factor is the voltage drop on the primary side. For the voltage detection circuit 172A, as the temperature decreases, the voltage drops of both the optocoupler and the rectifier diode in the rectifier circuit increase. At this time, after the drive controller 1761 in the first drive control circuit 176A turns on the matching temperature compensation sub-circuit 1762, a 330KΩ resistor (i.e., the first resistor) is connected in parallel on the primary side resistor of the optocoupler, greatly increasing the primary side conduction voltage of the optocoupler to ensure that the optocoupler is fully conducted and outputs a standard waveform. That is to say, at this time, the matching temperature compensation sub-circuit 1762 includes a first switching tube and a first resistor with a resistance value of 330KΩ.

[0067] For the current detection circuit 172B, as the temperature decreases, the voltage drops of both the optocoupler and the rectifier diode increase. At this time, after the drive controller 1761 in the second drive control circuit 176B turns on the matching temperature compensation sub-circuit 1762, a 220Ω resistor (i.e., the first resistor) is connected in parallel on the primary side resistor of the optocoupler, greatly increasing the primary side conduction voltage of the optocoupler to ensure that the optocoupler is fully conducted and outputs a standard waveform. That is to say, at this time, the matching temperature compensation sub-circuit 1762 includes a first switching tube and a first resistor with a resistance value of 220Ω.

[0068] When the current temperature is between -20°C and 0°C, compared with the normal gear, the temperature still decreases. At this time, for the voltage detection circuit 172A, a standard waveform can be output without adjustment; for the current detection circuit 172B, as the temperature decreases, the voltage drops of both the optocoupler and the rectifier diode increase. At this time, after the drive controller 1761 in the second drive control circuit 176B turns on the matching temperature compensation sub-circuit 1762, a 510Ω resistor (i.e., the first resistor) is connected in parallel on the primary side resistor of the optocoupler, greatly increasing the primary side conduction voltage of the optocoupler to ensure that the optocoupler is fully conducted and outputs a standard waveform. That is to say, at this time, the matching temperature compensation sub-circuit 1762 includes a first switching tube and a first resistor with a resistance value of 510Ω.

[0069] When the current temperature is between 50°C and 70°C, as the temperature rises, the maximum value of the CTR of the optocoupler decreases, and the secondary side current is more difficult to drive. The main influencing factors are the load current on the secondary side and the drive current on the primary side. For the voltage detection circuit 172A, a standard waveform can be output without adjustment; for the current detection circuit 172B, as the temperature rises, the voltage drops of both the optocoupler and the rectifier diode decrease. At this time, after the drive controller 1761 in the second drive control circuit 176B turns on the matching temperature compensation sub-circuit 1762, a 510Ω resistor is connected in parallel on the primary side resistor of the optocoupler or a 4.7KΩ resistor is connected in series on the secondary side resistor of the optocoupler, greatly increasing the drive current on the primary side of the optocoupler or reducing the load current on the secondary side, ensuring that the optocoupler is fully turned on and a standard waveform is output.

[0070] When the current temperature is between 70°C and 90°C, for the voltage detection circuit 172A, a standard waveform can be output without adjustment; for the current detection circuit 172B, at this time, after the drive controller 1761 in the second drive control circuit 176B turns on the matching temperature compensation sub-circuit 1762, a 330Ω resistor is connected in parallel on the primary side resistor of the optocoupler or a 10KΩ resistor is connected in series on the secondary side resistor of the optocoupler, greatly increasing the drive current on the primary side of the optocoupler or reducing the load current on the secondary side, ensuring that the optocoupler is fully turned on and a standard waveform is output.

[0071] When the current temperature is between 90°C and 110°C, for the voltage detection circuit 172A, after the drive controller 1761 in the first drive control circuit 176A turns on the matching temperature compensation sub-circuit 1762, a 330KΩ resistor is connected in parallel on the primary side resistor of the optocoupler or a 4.7KΩ resistor is connected in series on the secondary side resistor, greatly increasing the drive current on the primary side of the optocoupler or reducing the load current on the secondary side, ensuring that the optocoupler is fully turned on and a standard waveform is output; for the current detection circuit 172B, at this time, after the drive controller 1761 in the second drive control circuit 176B turns on the matching temperature compensation sub-circuit 1762, a 220Ω resistor is connected in parallel on the primary side resistor or a 20K resistor is connected in series on the secondary side resistor, greatly increasing the drive current on the primary side of the optocoupler or reducing the load current on the secondary side, ensuring that the optocoupler is fully turned on and a standard waveform is output.

[0072] Continue to refer to Figure 2 , the lamp control board 17 further includes a strong power output path 174 connecting the first switch drive circuit 173 and the target detection circuit 172, which is used for the conversion between strong power and weak power.

[0073] In this embodiment, refer to Figure 5 , the traffic signal machine 10 further includes other single boards such as a pedestrian detection board 20, a vehicle detector board 21, and an adapter board 22.

[0074] The pedestrian detection board 20 is used for detecting pedestrians; the vehicle detector board 21 is used for detecting vehicles. The adapter board 22 is provided with a plurality of connector sockets for providing the following signals for users to dock: pedestrian input / output, vehicle detector input, communication signals (232 / 485), or alarm signals, etc.

[0075] In this embodiment, in order to improve the wiring safety in the traffic signal machine 10, the strong - power areas of all single - boards in the traffic signal machine 10 are arranged adjacent to each other, and the weak - power areas of all single - boards are arranged adjacent to each other. Thus, as Figure 5 shown, this setting can divide the entire traffic signal machine 10 into a strong - power area and a weak - power area, improving the wiring safety.

[0076] In this embodiment, it is also set that any two single - boards in the traffic signal machine 10 are docked in a board - card docking manner, integrating all functional modules into one chassis, which is convenient for installation, replacement, and maintenance. At the same time, it also greatly reduces the space occupied by external modules, reduces the risks of messy routing, overlapping, damage of external cables, and abnormal signal docking, etc., thereby improving the reliability of the traffic signal machine 10.

[0077] Through the above - mentioned solution, using the minimalist design concept, an integrated chassis design is realized. The originally independently installed functional modules and complex wiring cables are replaced with an integrated board - card method, making full use of the device space, re - arranging and planning each single - board, so that all single - boards are integrated in the same chassis under the condition of the same device size, thus saving the extra space occupied by each module and various strong and weak electric cables between modules.

[0078] Among them, different single - boards in this application implement different functions. For example, the main control board 15, pedestrian detection board 20, vehicle detector board 21, main power board 13, lamp control board 17, adapter board 22, and yellow - flash board 18 are all different single - boards. When both the main power board 13 and the backup power board 14 exist at the same time, the main power board 13 and the backup power board 14 can be set in different card slots of the same single - board, that is to say, the main power board 13 and the backup power board 14 are integrated on the same single - board. By analogy, the main control board 15 and the backup main control board 16 can also be integrated on the same single - board. Of course, the main power board 13 and the backup power board 14 can also be two single - boards, and in this case, the card - board docking method is also used for docking.

[0079] Next, in combination with Figure 6 , the automated verification process of the traffic signal machine 10 is introduced. This process includes automated tests of strong - power output, pedestrian detection, vehicle detector detection, and main - board communication functions to ensure the functional reliability of the shipped products.

[0080] For the high-power output function: The output status is indicated by a low-cost test lamp board (step-down + voltage stabilization + LED), and after the results are summarized by the single-chip microcomputer, they are reported to the platform via RS485 / RS232 or network.

[0081] For the pedestrian detection function: By connecting all input channels in series one by one, the wiring and testing times are reduced, and the testing efficiency is greatly improved. Then, the single-chip microcomputer collects the total input status to determine whether the function is okay and reports it to the platform.

[0082] For the vehicle detector detection function: The relay is used to switch the inductance value to simulate the magnetic induction change of the external coil (i.e., the effect of a vehicle passing by), and then the detection result is judged by the single-chip microcomputer and uploaded to the platform.

[0083] For the main board communication function: All communication interfaces are reserved on the tooling board, and all communications are tested by the single-chip microcomputer instructions to check if they are okay.

[0084] The test scheme of this application is simple, fast and accurate, providing strong guarantee for the shipped products and ensuring the quality.

[0085] The above is the introduction of the traffic signal machine 10. In addition, this application also separately protects the above-mentioned main control board 15. For the detailed structure, please refer to the above relevant content and will not be elaborated here.

[0086] The above are only the embodiments of this application, and do not limit the patent scope of this application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. A lamp control board, characterized in that, The lamp control board includes: A lamp control processor for receiving an external signal and controlling the on / off of each unit lamp in the signal lamp according to the external signal; A target detection circuit including an optocoupler for detecting the voltage / current of the unit lamp. When the voltage / current of the unit lamp reaches the current threshold value of the optocoupler, the optocoupler switches its state, thereby sending a trigger signal to the lamp control processor. The target detection circuit further includes a primary resistor connected in series to the primary side of the optocoupler and a secondary resistor connected in series to the secondary side of the optocoupler; A temperature detection circuit for detecting the temperature of the lamp control board; A drive control circuit connected to the temperature detection circuit and the target detection circuit for compensating the current threshold value of the optocoupler according to the temperature detected by the temperature detection circuit to ensure that the current threshold value of the optocoupler does not exceed a preset range with the change of temperature; Wherein, the drive control circuit includes a drive controller and a plurality of temperature compensation sub - circuits. The drive controller is connected to the temperature detection circuit, and the plurality of temperature compensation sub - circuits are all connected to the drive controller and the target detection circuit. Among them, the drive controller is used to turn on the matching temperature compensation sub - circuit according to the temperature detected by the temperature detection circuit to compensate the optocoupler; Wherein, the temperature compensation sub - circuit includes: A first switching tube and a first resistor. The control end of the first switching tube is connected to the drive controller. When the drive controller turns on the temperature compensation sub - circuit, the first switching tube switches its state to parallel - connect the first resistor to the primary resistor; and / or, A second switching tube and a second resistor. The control end of the second switching tube is connected to the drive controller. When the drive controller turns on the temperature compensation sub - circuit, the second switching tube switches its state to series - connect the second resistor to the secondary resistor.

2. A traffic signal controller, characterized in that, It includes a signal lamp and the lamp control board as described in claim 1.

3. The traffic signal according to claim 2, wherein The traffic signal controller further includes: A main power supply; A main power supply board connected to the main power supply for converting the alternating current output by the main power supply into direct current; A main control board connected to the main power supply board and the lamp control board. Among them, the lamp control board receives the drive signal sent by the main control board and controls the on / off of each unit lamp in the signal lamp according to the drive signal.

4. The traffic signal controller according to claim 3, characterized in that, The traffic signal controller further includes: A backup power supply. When the main power supply has an abnormality, the backup power supply supplies power instead of the main power supply; And / or, a backup power supply board. When the main power supply board has an abnormality, the backup power supply board works instead of the main power supply board; And / or, a backup main control board. When the main control board has an abnormality, the backup main control board works instead of the main control board.

5. The traffic signal according to claim 4, characterized in that, The traffic signal controller further includes: A yellow - flashing board. When the main power supply board, the main control board or the lamp control board has an abnormality, the yellow - flashing board drives the signal lamp to work under the yellow - flashing mode.

6. The traffic signal controller according to claim 5, wherein The lamp control board further includes a first switch driving circuit. The first switch driving circuit is connected to the lamp control processor through the target detection circuit. After receiving the driving signal sent by the main control board, the lamp control processor drives the on / off of each unit lamp according to the driving signal through the first switch driving circuit; The yellow flashing board includes: A power module, connected to the main power supply, for converting the alternating current output by the main power supply into direct current; A yellow flashing processor, connected to the power module and communicatively connected to the main control board; A second switch driving circuit, connected to the yellow flashing processor. The yellow flashing processor drives the signal lamp to work under the yellow flashing template through the second switch driving circuit; A first logic switching circuit, connected to the first switch driving circuit, the second switch driving circuit and the signal lamp at the same time. When an abnormality occurs in the main power supply board, the main control board or the lamp control board, the first logic switching circuit connects the second switch driving circuit and the signal lamp, and disconnects the connection between the first switch driving circuit and the signal lamp.

7. The traffic signal controller according to claim 6, wherein, The yellow flashing board further includes: A pure hardware square wave generating circuit, connected to the yellow flashing processor and the main control board; A second logic switching circuit, connected to the yellow flashing processor, the pure hardware square wave generating circuit and the second switch driving circuit at the same time. When an abnormality occurs in the main power supply board, the main control board or the lamp control board and the yellow flashing processor also has an abnormality, the second logic switching circuit connects the pure hardware square wave generating circuit and the second switch driving circuit and disconnects the connection between the yellow flashing processor and the second switch driving circuit, so that the signal output by the pure hardware square wave generating circuit drives the signal lamp to work under the yellow flashing template.

8. The traffic signal controller according to claim 2, wherein The weak current areas of all single boards in the traffic signal controller are arranged adjacent to each other, and the strong current areas are arranged adjacent to each other.

9. The traffic signal according to claim 8, characterized in that, Any two single boards included in the traffic signal controller are docked in a way of card board docking.

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