CAN bus network structure for strong electromagnetic interference environment

Abstract

The utility model relates to a CAN bus network structure for a strong electromagnetic interference environment. The CAN bus network structure comprises a plurality of CAN network bridge concentrators, a first controller, a second controller, a sensor, a display and first electronic equipment with strong electromagnetic interference, the CAN bus interface of the first controller is in communication connection with the CAN bus interface of the input end of one CAN network bridge concentrator; an output end CAN bus interface of the CAN network bridge concentrator is respectively in communication connection with input end CAN bus interfaces of one or more additional CAN network bridge concentrators, and output end CAN bus interfaces of the CAN network bridge concentrators are respectively in communication connection with a second controller, a sensor, a display and a first electronic equipment CAN bus interface; wherein the first controller is a PLC (Programmable Logic Controller); the first electronic device comprises at least one of a frequency converter, a transformer substation and a base station. The CAN bus network structure provided by the utility model is compact in structure, and the modular structural design is beneficial to deployment, expansion and maintenance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to CAN bus network structure's technical field, especially relates to the CAN bus network structure for strong electromagnetic interference environment. BACKGROUND

[0002] CAN bus protocol as ISO international standardization's serial communication protocol, can effectively provide strong technical support for the distributed control system realizes each node between real-time, reliable data communication, is widely used in industrial automation control field.

[0003] CAN bus commonly adopts such as Figure 1 Network topological structure form, namely each work node is connected with physical bus through corresponding output CANH and CANL, realizes the real-time data communication between each node.In practical application, generally through adopting shielded twisted pair transmission medium, short frame structure transmission data etc., to improve CAN communication's data transmission quality or the ability of resisting external electromagnetic interference.But in the occasion with similar frequency converter, substation, radar or base station etc. strong electromagnetic interference source, CAN bus often appears such as communication interruption, data transmission instability, data error, packet loss or delay etc. under normal circumstances, seriously influence the stability of communication and transmission data's correctness between each node on CAN bus.

[0004] In view of the above problems of the conventional CAN bus network structure frequently, the utility model provides a CAN bus network structure for strong electromagnetic interference environment, to solve the network topological structure of CAN bus under the occasion of strong electromagnetic interference source, communication is easy to interrupt, data transmission instability, data error, packet loss or delay, and seriously influence the stability of communication and transmission data's correctness between each node on CAN bus. CONTENT OF UTILITY MODEL

[0005] The utility model provides a CAN bus network structure for strong electromagnetic interference environment for solving the network topological structure of CAN bus under the occasion of strong electromagnetic interference source, communication is easy to interrupt, data transmission instability, data error, packet loss or delay, and seriously influence the stability of communication and transmission data's correctness between each node on CAN bus.

[0006] The purpose of the utility model and solve its technical problems is realized by the following technical scheme.

[0007] The utility model provides a kind of CAN bus network structure for strong electromagnetic interference environment, this CAN bus network structure includes: multiple CAN network bridge concentrator, first controller, second controller, sensor, display and the first electronic equipment with strong electromagnetic interference;The CAN bus interface of first controller is connected with the input end CAN bus interface communication of one CAN network bridge concentrator;The output end CAN bus interface of CAN network bridge concentrator is respectively connected with the input end CAN bus interface communication of one or more CAN network bridge concentrator additionally added, and the output end CAN bus interface of multiple CAN network bridge concentrator is respectively connected with the CAN bus interface communication of second controller, sensor, display and first electronic equipment;Wherein, the terminal interface of detachable terminal in CAN network bridge concentrator does not exceed three, and first controller is PLC controller;First electronic equipment includes at least one device of frequency converter, transformer substation, base station.

[0008] As an optional implementation, the output end CAN bus interface of one or more CAN network bridge concentrator additionally added is respectively connected with the CAN bus interface communication of second controller, sensor, display and first electronic equipment.

[0009] As an optional implementation, when the terminal interface of detachable terminal is two, the bus interface of PLC controller is connected with the CAN bus interface communication of the input end of three-channel first CAN network bridge concentrator;The bus interface of the output end of three-channel first CAN network bridge concentrator is respectively connected with the CAN bus interface communication of the input end of three-channel second CAN network bridge concentrator and three-channel third CAN network bridge concentrator;The bus interface of the output end of three-channel second CAN network bridge concentrator is respectively connected with the CAN bus interface communication of display and sensor;The bus interface of the output end of three-channel third CAN network bridge concentrator is respectively connected with the CAN bus interface communication of second controller and frequency converter;Or three-channel fourth CAN network bridge concentrator replaces display, and the input end of three-channel fourth CAN network bridge concentrator is connected with the bus interface communication of the output end of three-channel second CAN network bridge concentrator, and the output end of three-channel fourth CAN network bridge concentrator is with the CAN bus interface of display.

[0010] As an optional implementation, when the terminal interface of detachable terminal is three, the bus interface of PLC controller is connected with the CAN bus interface communication of the input end of four-channel CAN network bridge concentrator;The bus interface of the output end of four-channel CAN network bridge concentrator is respectively connected with the CAN bus interface communication of the input end of rear four-channel CAN network bridge concentrator;Four CAN bus interfaces of frequency converter, second controller, sensor, display are respectively connected with any four CAN bus interfaces of the output end of rear four-channel CAN network bridge concentrator.

[0011] As an optional implementation, when the detachable terminal comprises two terminal interfaces and three terminal interfaces, the bus interface of the PLC controller is in communication connection with the CAN bus interface of the input end of the three-channel CAN bridge hub or the four-channel CAN bridge hub; the CAN bus interface of the output end of the three-channel CAN bridge hub or the four-channel CAN bridge hub is in communication connection with the CAN bus interface of the input end of the three-channel CAN bridge hub or the four-channel CAN bridge hub at the rear stage, respectively; and the four CAN bus interfaces of the frequency converter, the second controller, the sensor and the display are in communication connection with any four CAN bus interfaces of the output end of the three-channel CAN bridge hub or the four-channel CAN bridge hub at the rear stage, respectively.

[0012] As an optional implementation, the CAN bus network structure comprises: the CAN bus interface of at least one output end of the CAN bridge hub connected with the first controller is in communication connection with any at least one of the second controller, the sensor, the display and the first electronic device, the remaining output end CAN bus interfaces of the CAN bridge hub are in communication connection with the input end CAN bus interfaces of one or more CAN bridge hubs added, the output end CAN bus interfaces of the one or more CAN bridge hubs added are in communication connection with the CAN bus interfaces of the second controller, the sensor, the display and the first electronic device not in communication connection, respectively; wherein the terminal interface of the detachable terminal in the CAN bridge hub is not more than three, the first controller is a PLC controller; and the first electronic device comprises at least one of a frequency converter, a substation and a base station.

[0013] As an optional implementation, when the detachable terminal comprises two terminal interfaces and three terminal interfaces, the bus interface of the PLC controller is in communication connection with the CAN bus interface of the input end of the three-channel CAN bridge hub or the four-channel CAN bridge hub; the CAN bus interface of the output end of the three-channel CAN bridge hub or the four-channel CAN bridge hub is in communication connection with the CAN bus interface of the input end of the three-channel CAN bridge hub or the four-channel CAN bridge hub at the rear stage, respectively, and at least one of the CAN bus interfaces of the frequency converter, the second controller, the sensor and the display; and the CAN bus interfaces of the frequency converter, the second controller, the sensor and the display not in communication connection are in communication connection with the CAN bus interfaces of the output end of the three-channel CAN bridge hub or the four-channel CAN bridge hub at the rear stage, respectively.

[0014] Compared with the prior art, the utility model has apparent advantages and beneficial effects, based on above-mentioned technical scheme, the utility model has at least following one advantage and effect:

[0015] The utility model provides a kind of CAN bus network structure for strong electromagnetic interference environment, this CAN bus network structure includes: multiple CAN network bridge concentrator, first controller, second controller, sensor, display and the first electronic equipment with strong electromagnetic interference;The CAN bus interface of first controller is connected with the input end CAN bus interface communication of one CAN network bridge concentrator;The output end CAN bus interface of CAN network bridge concentrator is respectively connected with the input end CAN bus interface communication of one or more CAN network bridge concentrator additional, the output end CAN bus interface of multiple CAN network bridge concentrator is respectively connected with the CAN bus interface communication of second controller, sensor, display and first electronic equipment;Wherein, the terminal interface of detachable terminal in CAN network bridge concentrator does not exceed three, and first controller is PLC controller;First electronic equipment includes at least one device of frequency converter, transformer substation, base station.The CAN bus network structure for strong electromagnetic interference environment of the utility model, through CAN network bridge concentrator, it is convenient and flexible to access working node equipment, on the one hand, CAN bus can be realized to each working node of isolation transmission and relay function;While the other side network bridge concentrator can also store and forward the data of different rates between CAN network, and network expansion is carried out, and CAN communication stability between each network working node and the reliability of data transmission can be effectively improved.CAN network bridge concentrator is integrated in box, on the one hand, CAN bus network structure connects each working node, and it is convenient to independently plug and does not interfere with each other;On the other hand, it is convenient to dismount and maintain.

[0016] The above description is only the summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of specification, and in order to let the above structure and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following preferred embodiments are shown, and detailed description is as follows with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic diagram of the CAN network bridge concentrator of the embodiment.

[0018] Figure 2 It is the schematic diagram of the current traditional CAN bus network structure.

[0019] Figure 3 It is the schematic diagram of the CAN bus network structure of the three-channel one-in two-out CAN network bridge concentrator of the embodiment.

[0020] Figure 4 It is the schematic diagram of the CAN bus network structure of the four-channel one-in three-out CAN network bridge concentrator of the embodiment.

[0021] Figure 5This is a schematic diagram of a CAN bus network structure consisting of a three-channel CAN bridge hub with one input and two outputs, and a four-channel CAN bridge hub with one input and three outputs, according to this embodiment.

[0022] Figure 6 This is a schematic diagram of another CAN bus network structure composed of a three-channel CAN bridge hub with one input and two outputs or a four-channel CAN bridge hub with one input and three outputs, as described in this embodiment.

[0023] Figure 7 This is a schematic diagram of another CAN bus network structure composed of a three-channel CAN bridge hub with one input and two outputs or a four-channel CAN bridge hub with one input and three outputs, as described in this embodiment.

[0024] Figure 8 This is a schematic diagram of another CAN bus network structure composed of a three-channel CAN bridge hub with one input and two outputs or a four-channel CAN bridge hub with one input and three outputs, as described in this embodiment.

[0025] Explanation of icon numbers:

[0026] 1: Package structure; 2: First interface of CAN bus

[0027] 3: CAN bus second interface; 4: Detachable terminal

[0028] 5: Indicator light 6: Extended guide rail Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended purpose of the invention, the following detailed description of the specific implementation methods, structures, features and effects of this utility model, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0030] This utility model relates to a CAN bridge hub for use in environments with strong electromagnetic interference, such as... Figure 1 As shown, the CAN bridge hub includes: a packaged structure 1, a first CAN bus interface 2 and a second CAN bus interface 3 located on the first structural surface of the packaged structure 1, and detachable terminals 4 located on the first structural surface of the packaged structure 1 for electrical connection with external devices. The packaged structure 1 adopts a modular structure and has two or three independent CAN bus interfaces. The length of the packaged structure 1 can be selected as 100mm, the height as 113mm, and the width as 17.5mm. The minimum thickness of the packaged structure 1 is only a few tens of millimeters, making it compact and lightweight. The detachable terminals 4 include at least two terminal interfaces with the same structure located on the same side, and no more than three terminal interfaces. For example, the terminal interfaces can be two or three independent CAN bus interfaces. Figure 1As shown, multiple terminal interfaces can be evenly arranged along the extension direction of the encapsulation structure 1 on the detachable terminal 4, or evenly arranged in a direction perpendicular to the extension direction of the encapsulation structure 1 (not shown in the figure). Each terminal interface includes a first terminal interface and a second terminal interface. The first terminal interface is connected to the first CAN bus interface 1 within the encapsulation structure 1, and the second terminal interface is connected to the second CAN bus interface 2 within the encapsulation structure 1. (See...) Figure 1 As shown, the terminal interface (not shown) is electrically connected to the communication interface of other devices through three independent CAN buses on the detachable terminal 4. The first structural surface is parallel to the extension direction of the encapsulation structure 1. This utility model's CAN bridge hub for strong electromagnetic interference environments is applied to a CAN bus network structure. On the one hand, it can realize the isolation, transmission, and relay functions of each working node on the CAN bus; on the other hand, the bridge hub can also store and forward data at different rates between CAN networks, and expand the network capacity, effectively improving the stability of CAN communication and the reliability of data transmission between network working nodes. The CAN bridge hub provided by this utility model has a small, compact structure and a modular design. It is connected to the extension and connection of the encapsulation structure 1 through detachable terminals and extension rails, and is fixed to the outside or inside the enclosure of the device to be connected through the extension rails. Its installation and connection configuration does not affect the original structure and component layout of the device. This CAN bridge hub has a simple structure, low manufacturing cost, good extension effect, and is easy to promote.

[0031] In this invention, to improve the stability of the integrated packaging structure 1, two parallel 35mm DIN standard metal guide rails are used. The two extended guide rails 6 are respectively adapted to two snap-fit ​​slots provided at the bottom of the packaging structure 1. The two snap-fit ​​slots are located on both sides of the middle of the packaging structure 1, arranged in a symmetrical structure. The snap-fit ​​structure combination of the two snap-fit ​​slots and the two extended guide rails 6 makes the packaging structure 1, which is extended and integrated along the length of the extended guide rails 6, less prone to loosening and more stable.

[0032] In the current traditional CAN bus network architecture, the CAN bus often adopts... Figure 2The network topology shown depicts each working node connected to the physical bus via its corresponding output terminals CANH and CANL, enabling real-time data communication between nodes. In practical applications, shielded twisted-pair transmission media and short-frame data transmission structures are typically used to improve the data transmission quality or resistance to external electromagnetic interference in CAN communication. However, in environments with strong electromagnetic interference sources such as frequency converters, substations, radar, or base stations, CAN bus network communication frequently experiences phenomena such as communication interruptions, unstable data transmission, data errors, packet loss, or delays, severely impacting the communication stability and data transmission accuracy between CAN nodes.

[0033] In this invention, a terminal block is provided between the extension guide rail 6 and the encapsulation structure 1. The terminal block is located on one side of the mounting box of the CAN bridge hub. The bottom of the terminal block is adapted to and fixed to the guide rail connecting plate of the extension guide rail 6. The U-shaped snap-fit ​​claw structure at the bottom of the encapsulation structure 1 is adapted to and snap-fitted to the top structure of the terminal block. Generally, the housing of a CAN bridge hub contains relays and their connected fuse groups, which are spaced a certain distance apart. A circuit breaker is also provided on one side of the relays and fuse groups, and a first filter and a second filter are installed beside the circuit breaker. The CAN bridge hub is installed on the other side of the relays and fuse groups, away from the circuit breaker, the first filter and the second filter, and with a certain distance from the relays and fuse groups. The extension guide rail 6 allows the terminal block and the CAN bridge hub to be conveniently installed in the mounting box of the CAN bridge hub (not shown in the figure). It should be noted that the terminal blocks, relays, circuit breakers, first filters, second filters, and fuse groups mentioned above are all external components of the CAN bridge hub. These external components are other components of the CAN bridge hub installed in the same application scenario, and will not be described in detail here.

[0034] In addition, this invention can also use multiple three-channel CAN bridge hubs with one input and two outputs, or multiple four-channel CAN bridge hubs with one input and three outputs, as in the prior art, to construct a CAN bus network structure for strong electromagnetic interference environments as described in this invention.

[0035] This utility model provides a CAN bus network structure for use in environments with strong electromagnetic interference, utilizing the aforementioned CAN bridge hub (including commonly used CAN bridge hubs in the prior art), such as... Figures 3 to 8As shown, the CAN bus network structure includes multiple CAN bridge hubs, a first controller, a second controller, sensors, a display, and a first electronic device with strong electromagnetic interference. The CAN bus interface of the first controller is communicatively connected to the input CAN bus interface of a CAN bridge hub. The output CAN bus interfaces of the CAN bridge hubs are respectively communicatively connected to the input CAN bus interfaces of one or more additional CAN bridge hubs. The output CAN bus interfaces of the multiple CAN bridge hubs are respectively communicatively connected to the CAN bus interfaces of the second controller, sensors, display, and the first electronic device. Among them, the CAN bridge hubs have no more than three detachable terminal interfaces, and the first controller is a PLC controller. The first electronic device includes at least one device among frequency converters, substations, and base stations. This invention relates to a CAN bus network structure for use in environments with strong electromagnetic interference. Through a CAN bridge hub, it allows for convenient and flexible connection to working node devices. On one hand, it enables isolated transmission and relay functions for each working node on the CAN bus. On the other hand, the bridge hub can store and forward data at different rates between CAN network nodes, as well as expand network capacity. Furthermore, it effectively improves the stability of CAN communication and the reliability of data transmission between network working nodes. Integrating the CAN bridge hub into the enclosure allows for convenient independent connection of each working node in the CAN bus network structure without interference. It also facilitates installation, removal, and maintenance.

[0036] As an optional implementation, the above-described CAN bridge hub (including commonly used CAN bridge hubs in the prior art) can be applied, such as... Figures 3 to 6 As shown, the CAN bus network structure includes: multiple CAN bridge hubs, a first controller, a second controller, sensors, a display, and a first electronic device with strong electromagnetic interference; the CAN bus interface of the first controller is connected to the input CAN bus interface of a CAN bridge hub; the output CAN bus interface of the CAN bridge hub is communicatively connected to the input CAN bus interfaces of one or more additional CAN bridge hubs, and the output CAN bus interfaces of the one or more additional CAN bridge hubs are communicatively connected to the CAN bus interfaces of the second controller, sensors, display, and the first electronic device; wherein, the first controller is a PLC controller; the first electronic device includes at least one device among frequency converters, substations, and base stations.

[0037] In embodiments of this utility model, when the CAN bridge hub is a three-channel, one-input, two-output type, the detachable terminal 4 consists of two identical terminal interfaces located on the same side, such as... Figure 3As shown, the CANH and CANL bus interfaces of the PLC controller are connected to the CAN bus interface of the first CAN bridge hub input terminal. The CAN1 bus interface of the first CAN bridge hub output terminal is connected to the CAN bus interfaces of the second and third CAN bridge hubs respectively. The CAN1 bus interface of the second CAN bridge hub output terminal is connected to the CAN bus interface of the fourth CAN bridge hub input terminal, thus completing the connection between the CAN bridge hubs. The CAN2 bus interface of the third CAN bridge hub output terminal is connected to the CAN bus interface of the frequency converter. The CAN1 bus interface of the third CAN bridge hub output terminal is connected to the CAN bus interface of the second controller, which can be a remote controller. The CAN2 bus interface of the second CAN bridge hub output terminal is connected to the CAN bus interface of the sensor. The CAN2 bus interface of the fourth CAN bridge hub output terminal is connected to the CAN bus interface of the display. After the aforementioned three-channel, one-input, two-output CAN bridge hub is connected to the electronic devices of each CAN working node via the bus, electrical isolation protection is achieved between each CAN working node (such as PCL controllers, frequency converters, remote controls, sensors, and displays). This avoids strong electromagnetic interference sources affecting the communication of the aforementioned devices between nodes, and eliminates problems such as data transmission interruption, data transmission errors, packet loss, and delays between the devices during communication, thereby improving the stability and reliability of data transmission. At the same time, it bridges the working nodes with different communication baud rates, realizing bus extension and capacity expansion. It also has bus fault analysis and diagnostic functions, further improving the stability and reliability of data transmission.

[0038] In embodiments of this utility model, when the CAN bridge hub is a four-channel, one-input, three-output type, the detachable terminal 4 consists of three identical terminal interfaces located on the same side, such as... Figure 4As shown, the CANH and CANL bus interfaces of the PLC controller are connected to the input CAN bus interface of the four-channel CAN bridge hub (one input, three outputs). The output CAN1 bus interface of the four-channel first CAN bridge hub is connected to the input CAN bus interface of the four-channel second CAN bridge hub. The output CAN2 bus interface of the four-channel first CAN bridge hub is connected to the input CAN bus interface of the four-channel third CAN bridge hub. The output CAN3 bus interface of the four-channel first CAN bridge hub is connected to the input CAN bus interface of the four-channel fourth CAN bridge hub. The output CAN3 bus interface of the four-channel fourth CAN bridge hub is connected to the CAN bus interface of the inverter. The output CAN2 bus interface of the four-channel fourth CAN bridge hub is connected to the CAN bus interface of the second controller. The output bus interface of the four-channel third CAN bridge hub is connected to the CAN bus interface of the sensor. The system includes a first sensor, a second sensor, and a third sensor. The output CAN1 bus interface of the four-channel third CAN bridge hub is connected to the CAN bus interface of the first sensor. The output CAN2 bus interface of the four-channel third CAN bridge hub is connected to the CAN bus interface of the second sensor. The output CAN3 bus interface of the four-channel third CAN bridge hub is connected to the CAN bus interface of the third sensor. The output bus interface of the four-channel second CAN bridge hub is connected to the CAN bus interface of the display, which includes a first display, a second display, and a third display. The output CAN1 bus interface of the four-channel second CAN bridge hub is connected to the CAN bus interface of the first display. The output CAN2 bus interface of the four-channel second CAN bridge hub is connected to the CAN bus interface of the second display. The output CAN3 bus interface of the four-channel second CAN bridge hub is connected to the CAN bus interface of the third display. After the aforementioned four-channel CAN bridge hub with one input and three outputs is connected to the electronic devices of each CAN working node, electrical isolation protection is achieved between the nine working nodes of each CAN (such as PCL controller, frequency converter, remote control, first sensor, second sensor, third sensor, first display, second display, and third display). This avoids strong electromagnetic interference sources affecting the communication of the aforementioned devices between nodes, and eliminates problems such as data transmission interruption, data transmission errors, packet loss, and delay between the devices during communication, thus improving the stability and reliability of data transmission. At the same time, it bridges the working nodes with different communication baud rates, realizing bus extension and capacity expansion. It also has bus fault analysis and diagnostic functions, further improving the stability and reliability of data transmission.

[0039] In embodiments of this utility model, when the CAN bridge hub includes a three-channel CAN bridge hub with one input and two outputs and a four-channel CAN bridge hub with one input and three outputs, the detachable terminal 4 includes two types: two terminal interfaces with the same structure located on the same side and three terminal interfaces with the same structure located on the same side. For example... Figure 5 As shown, the CANH and CANL bus interfaces of the PLC controller are connected to the CAN bus interface of the input terminal of the four-channel fifth CAN bridge hub. The CAN3, CAN2, and CAN1 bus interfaces of the four-channel fifth CAN bridge hub are connected to the CAN bus interfaces of the input terminals of the three-channel fifth CAN bridge hub, sixth CAN bridge hub, and seventh CAN bridge hub, respectively, to complete the connection between the CAN bridge hubs. The CAN2 bus interface of the input terminal of the three-channel fifth CAN bridge hub is connected to the CAN bus interface of the frequency converter. The CAN1 bus interface of the input terminal of the three-channel fifth CAN bridge hub is connected to the CAN bus interface of the second controller (the second controller can be a remote controller). The CAN2 bus interface of the input terminal of the three-channel sixth CAN bridge hub is connected to the CAN bus interface of the sensor. The CAN2 bus interface of the input terminal of the three-channel seventh CAN bridge hub is connected to the CAN bus interface of the display. The aforementioned CAN bus network structure eliminates the need for a third-channel seventh CAN bridge hub and connects the display's CAN bus interface to the input CAN1 bus interface of the third-channel sixth CAN bridge hub, thus reducing the number of CAN bridge hubs. After the three-channel (one input, two outputs) and four-channel (one input, three outputs) CAN bridge hubs are connected to the electronic device buses between each CAN working node, electrical isolation protection is achieved between the five working nodes in each CAN bus (such as PCL controllers, frequency converters, remote controls, sensors, and displays). This prevents strong electromagnetic interference from affecting the communication of the aforementioned devices between nodes, eliminating problems such as data transmission interruptions, errors, packet loss, and delays during communication, thus improving data transmission stability and reliability. Simultaneously, it bridges the working nodes with different communication baud rates, enabling bus extension and capacity expansion. Furthermore, it features bus fault analysis and diagnostic functions, further enhancing the stability and reliability of data transmission.

[0040] In embodiments of this utility model, when the CAN bridge hub includes a three-channel CAN bridge hub with one input and two outputs and a four-channel CAN bridge hub with one input and three outputs, the detachable terminal 4 includes two types: two terminal interfaces with the same structure located on the same side and three terminal interfaces with the same structure located on the same side. For example... Figure 6As shown, the CANH and CANL bus interfaces of the PLC controller are connected to the CAN bus interface of the input terminal of the three-channel eighth CAN bridge hub. The CAN1 and CAN2 bus interfaces of the output terminals of the three-channel eighth CAN bridge hub are connected to the CAN bus interfaces of the input terminals of the four-channel seventh and sixth CAN bridge hubs, respectively, to complete the connection between the CAN bridge hubs. The CAN3 bus interface of the input terminal of the four-channel sixth CAN bridge hub is connected to the CAN bus interface of the frequency converter. The CAN2 bus interface of the input terminal of the four-channel sixth CAN bridge hub is connected to the CAN bus interface of the second controller (which can be a remote controller). The CAN1 bus interface of the input terminal of the four-channel sixth CAN bridge hub is connected to the CAN bus interface of the sensor. The CAN2 bus interface of the input terminal of the four-channel seventh CAN bridge hub is connected to the CAN bus interface of the display. The aforementioned three-channel (one input, two outputs) and four-channel (one input, three outputs) CAN bridge hubs are connected to the electronic device buses of each CAN working node. This achieves electrical isolation protection between the CAN working nodes (such as PLC controllers, frequency converters, remote controls, sensors, and displays), preventing strong electromagnetic interference from affecting the communication of the aforementioned devices between nodes. It eliminates problems such as data transmission interruption, data transmission errors, packet loss, and delays between the devices during communication, thus improving the stability and reliability of data transmission. At the same time, it bridges the working nodes with different communication baud rates, realizing bus extension and capacity expansion. It also has bus fault analysis and diagnostic functions, further improving the stability and reliability of data transmission.

[0041] As an optional implementation, using any of the CAN bridge hubs described above, the CAN bus network structure further includes: multiple CAN bridge hubs, a first controller, a second controller, a sensor, a display, and a first electronic device with strong electromagnetic interference; the CAN bus interface of the first controller is connected to the input CAN bus interface of a CAN bridge hub; at least one output CAN bus interface of the CAN bridge hub is communicatively connected to at least one of the second controller, sensor, display, and first electronic device; the remaining output CAN bus interfaces of the CAN bridge hub are communicatively connected to the input CAN bus interfaces of one or more additional CAN bridge hubs; the output CAN bus interfaces of the one or more additional CAN bridge hubs are respectively communicatively connected to the CAN bus interfaces of the second controller, sensor, display, and first electronic device that are not communicatively connected; wherein, the first controller is a PLC controller; the first electronic device includes at least one of a frequency converter, a substation, and a base station.

[0042] In embodiments of this utility model, when the CAN bridge hub includes a three-channel CAN bridge hub with one input and two outputs and a four-channel CAN bridge hub with one input and three outputs, the detachable terminal 4 includes two types: two terminal interfaces with the same structure located on the same side and three terminal interfaces with the same structure located on the same side. For example... Figure 7 As shown, the CANH and CANL bus interfaces of the PLC controller are connected to the CAN bus interface of the input terminal of the three-channel ninth CAN bridge hub. The CAN1 output terminal of the three-channel ninth CAN bridge hub is connected to the CAN bus interface of the frequency converter. The CAN2 output terminal of the three-channel ninth CAN bridge hub is connected to the CAN bus interface of the input terminal of the four-channel eighth CAN bridge hub to complete the connection between the CAN bridge hubs. The CAN1, CAN2, and CAN3 output terminals of the four-channel eighth CAN bridge hub are connected to the CAN bus interfaces of the sensor, the second controller, and the display, respectively. The second controller can be a remote control. As an alternative implementation, the above-mentioned four-channel eighth CAN bridge hub can also be replaced by adding a three-channel CAN bridge hub. The CAN1 and CAN2 output terminals of the extended three-channel CAN bridge hubs are connected to the CAN bus interfaces of the sensor, the second controller, and the display, respectively. Refer to the above-mentioned extended connection method of the CAN bridge hub, which will not be repeated here. After the aforementioned three-channel one-in-two-out and four-channel one-in-three-out CAN bridge hubs are connected to the electronic device bus between each CAN working node, or after the aforementioned three-channel one-in-two-out CAN bridge hubs are connected to the electronic device bus between each CAN working node, electrical isolation protection is achieved between each CAN working node (such as frequency converter, remote control, sensor, display). This avoids strong electromagnetic interference sources affecting the communication of the aforementioned devices between nodes, and eliminates problems such as data transmission interruption, data transmission errors, packet loss, and delay between the aforementioned devices during communication, thereby improving the stability and reliability of data transmission.

[0043] In embodiments of this utility model, when the CAN bridge hub includes a three-channel CAN bridge hub with one input and two outputs and a four-channel CAN bridge hub with one input and three outputs, the detachable terminal 4 includes two types: two terminal interfaces with the same structure located on the same side and three terminal interfaces with the same structure located on the same side. For example... Figure 8As shown, the CANH and CANL bus interfaces of the PLC controller are connected to the CAN bus interface of the input terminal of the four-channel ninth CAN bridge hub. The CAN1 output terminal of the four-channel ninth CAN bridge hub is connected to the CAN bus interface of the frequency converter. The CAN2 output terminal of the four-channel ninth CAN bridge hub is connected to the CAN bus interface of the display. The CAN3 output terminal of the four-channel ninth CAN bridge hub is connected to the CAN bus interface of the input terminal of the three-channel tenth CAN bridge hub. The CAN1 output terminal of the three-channel tenth CAN bridge hub is connected to the CAN bus interface of the second controller, which can be a remote controller. The CAN2 output terminal of the three-channel tenth CAN bridge hub is connected to the CAN bus interface of the sensor. As an alternative implementation, the aforementioned three-channel tenth CAN bridge hub can also be replaced by adding a four-channel CAN bridge hub. The output terminals CAN1, CAN2, and CAN3 of the extended four-channel CAN bridge hubs are connected to the second controller and the sensor, respectively. Referencing the aforementioned extended connection method for CAN bridge hubs, this will not be repeated here. After the aforementioned three-channel (one input, two outputs) and four-channel (one input, three outputs) CAN bridge hubs are connected to the electronic device buses between each CAN working node, or the aforementioned four-channel (one input, three outputs) CAN bridge hubs are connected to the electronic device buses between each CAN working node, electrical isolation protection is achieved between each CAN working node (such as inverters, remote controls, sensors, and displays). This prevents strong electromagnetic interference sources from affecting the communication of the aforementioned devices between nodes, eliminating problems such as data transmission interruptions, data transmission errors, packet loss, and delays during communication, thus improving data transmission stability and reliability.

[0044] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A CAN bus network structure for use in environments with strong electromagnetic interference, characterized in that, include: Multiple CAN bridge hubs, a first controller, a second controller, sensors, a display, and a first electronic device with strong electromagnetic interference; The CAN bus interface of the first controller is communicatively connected to the input CAN bus interface of a CAN bridge hub; the output CAN bus interface of the CAN bridge hub is communicatively connected to the input CAN bus interfaces of one or more additional CAN bridge hubs; the output CAN bus interfaces of the multiple CAN bridge hubs are communicatively connected to the CAN bus interfaces of the second controller, sensor, display and first electronic device respectively. The CAN bridge hub has no more than three detachable terminal interfaces, and the first controller is a PLC controller; the first electronic device includes at least one of the following: frequency converter, substation, and base station.

2. The CAN bus network structure according to claim 1, characterized in that, The output CAN bus interfaces of one or more additional CAN bridge hubs are respectively connected to the CAN bus interfaces of the second controller, sensor, display and first electronic device.

3. The CAN bus network structure according to claim 2, characterized in that, When there are two detachable terminal interfaces, the PLC controller's bus interface is connected to the CAN bus interface at the input of the three-channel first CAN bridge hub. The bus interface at the output end of the three-channel first CAN bridge hub is connected to the CAN bus interfaces at the input ends of the three-channel second CAN bridge hub and the three-channel third CAN bridge hub, respectively; the bus interface at the output end of the three-channel second CAN bridge hub is connected to the CAN bus interface of the display and the CAN bus interface of the sensor, respectively; the bus interface at the output end of the three-channel third CAN bridge hub is connected to the CAN bus interface of the second controller and the CAN bus interface of the frequency converter, respectively. Alternatively, a three-channel fourth CAN bridge hub can be used to replace the display. The input of the three-channel fourth CAN bridge hub is connected to the bus interface of the output of the three-channel second CAN bridge hub, and the output of the three-channel fourth CAN bridge hub is connected to the CAN bus interface of the display.

4. The CAN bus network structure according to claim 2, characterized in that, When there are three detachable terminal interfaces, the PLC controller's bus interface is connected to the CAN bus interface at the input of the four-channel CAN bridge hub. The bus interface at the output end of the four-channel CAN bridge hub is connected to the CAN bus interface at the input end of the subsequent four-channel CAN bridge hub. The four CAN bus interfaces of the frequency converter, the second controller, the sensor, and the display are respectively connected to any four CAN bus interfaces at the output of the subsequent four-channel CAN bridge hub.

5. The CAN bus network structure according to claim 2, characterized in that, When the detachable terminals include two-terminal interfaces and three-terminal interfaces, the PLC controller's bus interface communicates with the CAN bus interface at the input of a three-channel CAN bridge hub or a four-channel CAN bridge hub. The CAN bus interface at the output end of the three-channel CAN bridge hub or the four-channel CAN bridge hub is respectively connected to the CAN bus interface at the input end of the subsequent three-channel CAN bridge hub or the four-channel CAN bridge hub. The four CAN bus interfaces of the frequency converter, the second controller, the sensor, and the display are respectively connected to any four CAN bus interfaces at the output of the subsequent three-channel CAN bridge hub or four-channel CAN bridge hub.

6. The CAN bus network structure according to claim 1, characterized in that, include: At least one output CAN bus interface of the CAN bridge hub connected to the first controller is communicatively connected to at least one of the second controller, sensor, display and first electronic device; the remaining output CAN bus interfaces of the CAN bridge hub are communicatively connected to the input CAN bus interfaces of one or more additional CAN bridge hubs; the output CAN bus interfaces of the one or more additional CAN bridge hubs are respectively communicatively connected to the CAN bus interfaces of the second controller, sensor, display and first electronic device that are not communicatively connected. The CAN bridge hub has no more than three detachable terminal interfaces, and the first controller is a PLC controller; the first electronic device includes at least one of the following: frequency converter, substation, and base station.

7. The CAN bus network structure according to claim 6, characterized in that, When the detachable terminals include two-terminal interfaces and three-terminal interfaces, the PLC controller's bus interface communicates with the CAN bus interface at the input of a three-channel CAN bridge hub or a four-channel CAN bridge hub. The CAN bus interface at the output end of the three-channel CAN bridge hub or the four-channel CAN bridge hub is respectively connected to the CAN bus interface at the input end of the subsequent three-channel CAN bridge hub or the four-channel CAN bridge hub, as well as at least one of the CAN bus interfaces of the frequency converter, the second controller, the sensor, and the display. The CAN bus interfaces of the inverter, second controller, sensor, and display that are not connected for communication are respectively connected to the CAN bus interface at the output end of the subsequent three-channel CAN bridge hub or four-channel CAN bridge hub.

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