Communication expansion device and communication system

Abstract

The utility model discloses a communication expansion device and a communication system. The device comprises a multi-mode optical module, a single-mode optical module, a single-mode optical fiber and a signal amplification module, the signal amplification module is connected between the multi-mode optical module and the single-mode optical module, and the signal amplification module is used for amplifying data signals; the multi-mode optical module is used for receiving a first data signal, and the single-mode optical module is used for sending the first data signal amplified by the signal amplification module to a first direction through a single-mode optical fiber; the single-mode optical module is used for receiving a second data signal through a single-mode optical fiber, and the multi-mode optical module is used for sending the second data signal amplified by the signal amplification module to a second direction. The data transmission distance between the first data signal and the second data signal can be expanded through the communication expansion device, and long-distance data transmission is achieved. For the master-slave equipment of the frequency converter, the requirement of master-slave control long-distance data transmission can be met only by adding the communication expansion device in a proper position, and the communication expansion device is simple and convenient.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication expansion device and a communication system. Background Art

[0002] A frequency converter is an energy control device that converts a commercial power source into an electric energy source at another frequency by effectively controlling the on and off of power semiconductor devices. Current frequency converters can control the on and off of power semiconductor devices through various control methods, including constant voltage-frequency proportional control, vector control, direct torque control, and sensorless vector control.

[0003] When a frequency converter controls constant-torque loads such as conveyor belts and pipe conveyors, multiple motors must drive the same load, requiring master-slave control of multiple frequency converters to achieve synchronous operation. Master-slave control of multiple frequency converters employs a strategy where the master controls speed and the slaves follow torque. The master and slaves are connected using twisted-pair cables, plastic optical fiber, or multimode optical fiber, and master-slave communication between multiple devices is expanded based on a custom communication protocol.

[0004] However, when twisted-pair cables are used for communication between master-slave devices, they must be laid at a certain distance from the power cables to prevent strong power signals from affecting data transmission. Furthermore, to ensure the dynamic tracking response speed between the master and slave devices, the bit rate must be kept constant. Consequently, the communication distance typically cannot exceed 100 meters. Plastic optical fiber and multimode optical fiber have maximum transmission distances of only 200 meters and 5 kilometers, respectively. With the advancement of belt conveyor technology, belts are becoming increasingly longer, sometimes exceeding 10 or even 20 kilometers. The multimode optical fiber transmission solutions previously used for long-distance control of VFD master and slave devices are no longer sufficient.

[0005] In addition, although the use of industrial Ethernet with single-mode optical fiber for transmission can meet the requirements, it requires the addition of industrial Ethernet devices, and the hardware and software of the master and slave devices also need to be modified to match the requirements of industrial Ethernet, which is more complicated. Utility Model Content

[0006] In view of this, the present application aims to solve at least one of the problems in the related art to a certain extent. To this end, the purpose of the present application is to provide a communication extension device and a communication system.

[0007] The present application provides a communication expansion device. The communication expansion device includes a multimode optical module, a single-mode optical module, a single-mode optical fiber, and a signal amplification module. The signal amplification module is connected between the multimode optical module and the single-mode optical module and is configured to amplify a data signal. The multimode optical module is configured to receive a first data signal, and the single-mode optical module is configured to transmit the first data signal amplified by the signal amplification module in a first direction via the single-mode optical fiber. The single-mode optical module is configured to receive a second data signal via the single-mode optical fiber, and the multimode optical module is configured to transmit the second data signal amplified by the signal amplification module in a second direction.

[0008] In some embodiments, the multimode optical module includes a multimode receiving optical module and a multimode transmitting optical module, the multimode receiving optical module includes a first receiving optical port, the first receiving optical port is used to receive the first data signal, the single-mode optical module includes a first transmitting optical port corresponding to the first receiving optical port, the first transmitting optical port is used to send the first data signal amplified by the signal amplification module through a first single-mode optical fiber; the multimode transmitting optical module includes a second transmitting optical port, the second transmitting optical port is used to send the second data signal amplified by the signal amplification module; the single-mode optical module includes a second receiving optical port corresponding to the second transmitting optical port, the second receiving optical port is used to receive the second data signal through a second single-mode optical fiber.

[0009] In some embodiments, the multi-mode optical module includes a multi-mode receiving optical module and a multi-mode transmitting optical module, the multi-mode receiving optical module includes a receiving optical port, the multi-mode transmitting optical module includes a transmitting optical port, the receiving optical port is used to receive the first data signal, and the transmitting optical port is used to send the second data signal amplified by the signal amplification module; the single-mode optical module is a wavelength division multiplexing single-mode bidirectional single-fiber optical module, the single-mode bidirectional single-fiber optical module includes a transmitting and receiving optical port corresponding to both the receiving optical port and the transmitting optical port, the transmitting and receiving optical port is used to send the first data signal amplified by the signal amplification module through the single-mode optical fiber, and to receive the second data signal through the single-mode optical fiber.

[0010] In some embodiments, the signal amplification module includes a first amplifier and a second amplifier, wherein the first amplifier is connected between the multimode receiving optical module and the single-mode optical module, and the second amplifier is connected between the multimode transmitting optical module and the single-mode optical module.

[0011] In some embodiments, the single-mode optical module includes a first transmitting data electrical port and a first receiving data electrical port, the first transmitting data electrical port is connected to the first amplifier, and the first receiving data electrical port is connected to the second amplifier; the multi-mode receiving optical module includes a second receiving data electrical port, and the multi-mode transmitting optical module includes a second transmitting data electrical port, the second receiving data electrical port is connected to the first amplifier, and the second transmitting data electrical port is connected to the second amplifier.

[0012] In some embodiments, the single-mode optical module includes a single-mode transmitting optical module and a single-mode receiving optical module; the multi-mode optical module is used to receive the first data signal, and the single-mode transmitting optical module is used to send the first data signal amplified by the signal amplification module in a first direction; the single-mode receiving optical module is used to receive the second data signal, and the multi-mode optical module is used to send the second data signal amplified by the signal amplification module in a second direction.

[0013] The present application also provides a communication system. The communication system includes a first device, a second device, and the communication expansion device described in any one of the above embodiments, wherein the first device and the second device bidirectionally transmit data signals via the communication expansion device, the first end of the multi-mode optical module is connected to the first device, the signal amplification module is connected between the second end of the multi-mode optical module and the single-mode optical module, and the single-mode optical module is connected to the second device via the single-mode optical fiber.

[0014] In some embodiments, the communication system includes a first communication extension device and a second communication extension device, the first communication extension device and the second communication extension device are connected via the single-mode optical fiber; a first end of the first communication extension device is connected to the first device, a second end of the first communication extension device is connected to the first end of the second communication extension device, and a second end of the second communication extension device is connected to the second device; the first device and the second device bidirectionally transmit data signals via the first communication extension device and the second communication extension device.

[0015] In some embodiments, there are multiple second devices, and the communication system further includes multiple second communication extension devices connected to the multiple second devices. The multiple second devices are connected in series through the multiple second communication extension devices for data transmission, and the number of the second communication extension devices is the same as the number of the second devices.

[0016] In some embodiments, the number of the first device is one, the number of the second devices is one or more, and the plurality of second devices are connected in series via the plurality of the communication expansion devices to transmit the data signal. When the number of the second devices is n, where n>1, the second data signal emitted by the first second device is sequentially transmitted through n second devices, and then transmitted by the nth second device to the receiving optical port of the single-mode optical module via the single-mode optical fiber, and then transmitted to the first device via the transmitting optical port of the multi-mode optical module.

[0017] The present application can extend the data transmission distance of the first data signal and the second data signal through a communication expansion device, thereby achieving long-distance data transmission. For the master and slave devices of the inverter, there is no need to modify the inverter itself, nor is there any need to convert the original master-slave control signal of the inverter into an Ethernet protocol for transmission via industrial Ethernet. Instead, the communication expansion device of the present application can be added at an appropriate position in the multimode optical fiber link loop between the original master and slave devices to meet the requirements of long-distance data transmission of master-slave control, which is simple and convenient.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a schematic structural diagram of a communication expansion device according to certain embodiments of the present application;

[0021] Figure 2 is a schematic diagram of the structure of a communication system according to certain embodiments of the present application;

[0022] Figure 3 is a schematic diagram of the structure of a communication system according to certain embodiments of the present application;

[0023] Figure 4 It is a structural diagram of a communication system in the related art;

[0024] Figure 5 It is a structural diagram of a communication system of certain embodiments of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0026] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance, or implicitly specifying the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed" and "connected" should be understood broadly, and may refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection, or mutual communication; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0028] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0030] See also Figure 1 and Figure 2 The present application discloses a communication extension device 100. The communication extension device 100 includes a multimode optical module 10, a single-mode optical module 20, a single-mode optical fiber 30, and a signal amplification module 40. The signal amplification module 40 is connected between the multimode optical module 10 and the single-mode optical module 20 and is used to amplify data signals.

[0031] The multi-mode optical module 10 is used for transmitting the first data signal, and the single-mode optical module 20 is used for transmitting the first data signal amplified by the signal amplification module 40 in a first direction through the single-mode optical fiber 30 .

[0032] The single-mode optical module 20 is used to receive the second data signal through the single-mode optical fiber 30 , and the multi-mode optical module 10 is used to transmit the second data signal amplified by the signal amplification module 40 in the second direction.

[0033] Specifically, single-mode optical fiber has low transmission loss, long transmission distances, and high bandwidth, enabling it to support high-speed data transmission. Therefore, the communication expansion device 100 of the present application can meet the needs of long-distance communication between communication devices. In other words, the transmission loss of single-mode optical fiber is more than an order of magnitude lower than that of multimode optical fiber, effectively increasing the transmission distance of optical signals. This solves the problem of requiring multiple optical fiber communication relay amplifiers to achieve effective communication in long-distance multimode optical fiber transmission paths.

[0034] The first direction and the second direction can be any different directions and are not limited here.

[0035] That is, the present application can extend the data transmission distance of the first data signal and the second data signal through the communication expansion device, thereby achieving long-distance data transmission. For the master and slave devices of the inverter, there is no need to modify the inverter itself, nor is there any need to convert the inverter's original master-slave control signals into Ethernet protocols for transmission via industrial Ethernet. Instead, the communication expansion device of the present application can be added at an appropriate location in the multimode optical fiber link loop between the original master and slave devices to meet the requirements of long-distance master-slave control data transmission, which is simple and convenient.

[0036] See also Figure 1 and Figure 2 In one embodiment, the multimode optical module 10 includes a multimode receiving optical module 11 and a multimode transmitting optical module 12. The multimode receiving optical module 11 includes a first receiving optical port 111, and the first receiving optical port 111 is used to receive a first data signal. The single-mode optical module 20 includes a first transmitting optical port 21 corresponding to the first receiving optical port 111, and the first transmitting optical port 21 is used to send the first data signal amplified by the signal amplification module 40 through the first single-mode optical fiber 31.

[0037] The multimode transmitting optical module 12 includes a second transmitting optical port 121 for transmitting the second data signal amplified by the signal amplifying module 40. The single-mode optical module 20 includes a second receiving optical port 22 corresponding to the second transmitting optical port 121 for receiving the second data signal via the second single-mode optical fiber 32.

[0038] Specifically, the single-mode optical module 20 can be as follows: Figure 1The illustrated single-mode bidirectional optical module, i.e., a single-mode bidirectional optical module, includes a first transmitting optical port 21 and a second receiving optical port 22. The first transmitting optical port 21 interfaces with a first single-mode optical fiber 31, and the second receiving optical port 22 interfaces with a second single-mode optical fiber 32. The communication expansion device 100 of the present application can achieve bidirectional data transmission conversion between single-mode optical fiber and multimode optical fiber by cooperating with a single-mode bidirectional optical module, a separate multimode receiving optical module 11, and a multimode transmitting optical module 12.

[0039] In this way, the communication extension device 100 in this embodiment can achieve bidirectional transmission of long-distance data by connecting the single-mode optical module 20 to two single-mode optical fibers.

[0040] In addition to enabling bidirectional transmission of long-distance data through two single-mode optical fibers 30, the communication extension device 100 of the present application can also enable bidirectional transmission of long-distance data through only one single-mode optical fiber 30, thereby reducing the number of fiber cores of the single-mode optical fiber 30 by half. This makes the communication extension device 100 simpler in structure and lowers the manufacturing cost.

[0041] That is, see Figure 3 In another embodiment, the multimode optical module 10 includes a multimode receiving optical module 11 and a multimode transmitting optical module 12, the multimode receiving optical module 11 includes a receiving optical port, the multimode transmitting optical module 12 includes a transmitting optical port, the receiving optical port is used to receive the first data signal, and the transmitting optical port is used to send the second data signal amplified by the signal amplification module 40.

[0042] The single-mode optical module 20 is a single-mode bidirectional single-fiber optical module with wavelength division multiplexing. The single-mode bidirectional single-fiber optical module includes a transmitting and receiving optical port 23 corresponding to both the receiving optical port and the transmitting optical port. The transmitting and receiving optical port 23 is used to send the first data signal amplified by the signal amplification module 40 through the single-mode optical fiber 30, and to receive the second data signal through the single-mode optical fiber 30.

[0043] Specifically, the single-mode optical module 20 is a single-mode single-fiber bidirectional optical module with wavelength division multiplexing, that is, the wavelength division multiplexing function of the single fiber is independently completed within the single-mode optical module 20. Therefore, only one single-mode optical fiber is needed to realize bidirectional transmission of long-distance data between different communication devices.

[0044] Among them, Wavelength Division Multiplexing (WDM) technology is a multiplexing technology for optical fiber communications. It can simultaneously transmit multiple light waves of different wavelengths within a single optical fiber, thereby significantly improving data transmission speed and capacity.

[0045] Thus, the communication extension device 100 in this embodiment includes a single-mode bidirectional single-fiber optical module with wavelength division multiplexing, and only one single-mode optical fiber is needed to achieve long-distance bidirectional transmission of data between different communication devices, which has a simpler structure.

[0046] In addition, the communication extension device 100 of the present application can also increase the number of single-mode single-fiber bidirectional optical modules of each communication device to 2, and build two communication ring networks by using two single-mode optical fibers 30 between the communication devices, thereby improving the reliability of the communication network.

[0047] See also Figure 1 and Figure 2 In some embodiments, the signal amplification module 40 includes a first amplifier 41 and a second amplifier 42. The first amplifier 41 is connected between the multimode receiving optical module 11 and the single-mode optical module 20, and the second amplifier 42 is connected between the multimode transmitting optical module 12 and the single-mode optical module 20.

[0048] The first amplifier 41 and the second amplifier 42 may be buffer chips or other amplifying electronic components, which are not limited here.

[0049] Specifically, the first amplifier 41 is connected between the multi-mode receiving optical module 11 and the single-mode optical module 20. That is, the first amplifier 41 is used to amplify the data signal transmitted from the single-mode optical module 20 toward the multi-mode receiving optical module 11, playing a key role in signal amplification and enhancement, ensuring the stability and reliability of the data signal during the transmission process.

[0050] The second amplifier 42 is connected between the multi-mode transmit optical module 12 and the single-mode optical module 20. Specifically, the second amplifier 42 is used to amplify the data signal transmitted from the multi-mode transmit optical module 12 toward the single-mode optical module 20, playing a key role in signal amplification and enhancement, ensuring the stability and reliability of the data signal during transmission.

[0051] In this way, the communication extension device 100 of the present application can amplify and enhance the bidirectionally transmitted data signal through the signal amplification module 40, thereby ensuring the stability and reliability of the bidirectional long-distance transmission of the data signal.

[0052] Specifically, if Figure 1 As shown, the single-mode optical module 20 includes a first transmit data electrical port P1 and a first receive data electrical port P2. The first transmit data electrical port P1 is connected to the first amplifier 41, and the first receive data electrical port P2 is connected to the second amplifier 42. The multi-mode receive optical module 11 includes a second receive data electrical port Q1, and the multi-mode transmit optical module 12 includes a second transmit data electrical port Q2. The second receive data electrical port Q1 is connected to the first amplifier 41, and the second transmit data electrical port Q2 is connected to the second amplifier 42.

[0053] In detail, for example, Figure 2 As shown, when the multi-mode optical receiving module 11 of the communication extension device 100 of the present application receives an optical pulse signal containing data transmitted via the multi-mode optical fiber 1 by the multi-mode transmitter for master-slave control of frequency converter A, an electrical signal with the same variation trend as the optical pulse appears on the data receiving electrical interface Q1 of the multi-mode optical receiving module 11 of the communication extension device 100. This electrical signal is amplified and amplified by the first amplifier 41 and then transmitted to the data transmitting electrical interface P1 of the single-mode bidirectional optical module connected to the output end of the first amplifier 41. The single-mode bidirectional optical module controls the output optical pulse based on the variation trend of the electrical level on the data transmitting electrical interface P1. The optical pulse is then transmitted to the first single-mode optical fiber 31 via the transmitting optical port of the single-mode bidirectional optical module for connection to the communication extension device configured for frequency converter B.

[0054] Similarly, when the second receiving optical port 22 of the single-mode bidirectional optical module of the communication extension device 100 of the present application receives an optical pulse signal containing data transmitted by the second single-mode optical fiber 32, an electrical signal with the same variation trend as the optical pulse appears at the data receiving electrical interface P2 of the single-mode bidirectional optical module. This electrical signal is amplified and amplified by the second amplifier 42 and then transmitted to the data transmitting electrical interface Q2 of the multimode transmitting optical module 12 connected to the output end of the second amplifier 42. The multimode transmitting optical module 12 controls the output optical pulse based on the variation trend of the electrical level at the data transmitting electrical interface Q2, and transmits the optical pulse via the multimode optical fiber 2 to the multimode receiver of the frequency converter A for master-slave control.

[0055] In this way, the communication extension device 100 of the present application can realize bidirectional long-distance transmission of data signals by providing a transmitting data electrical port and a receiving data electrical port combined with a single-mode optical fiber on the single-mode optical module 20, providing a receiving data electrical port on the multi-mode receiving optical module 11, and providing a transmitting data electrical port combined with a multi-mode optical fiber on the multi-mode transmitting optical module 12.

[0056] In addition, the present application can also change the single-mode bidirectional optical module of the conventional integrated transceiver module into a special single-mode optical module with independent sending and receiving parts, thereby respectively realizing the sending and receiving of the first data signal and the second data signal, making the transmission route of the data signal clearer and less prone to confusion.

[0057] In some embodiments, the single-mode optical module 20 includes a single-mode transmitting optical module and a single-mode receiving optical module. The multi-mode optical module 10 is configured to receive a first data signal, and the single-mode transmitting optical module is configured to transmit the first data signal amplified by the signal amplification module 40 in a first direction. The single-mode receiving optical module is configured to receive a second data signal, and the multi-mode optical module 10 is configured to transmit the second data signal amplified by the signal amplification module 40 in a second direction.

[0058] In this way, the present application can realize bidirectional transmission of the first data signal and the second data signal by using the single-mode optical module 20 with two independent sending and receiving parts, so that the two data signals do not interfere with each other and the impact is relatively small.

[0059] See also Figure 1 and Figure 4 This application also provides a communication system 1000. The communication system 1000 includes a first device 210, a second device 220, and the communication extension device 100 described in the above embodiment. The first device 210 and the second device 220 bidirectionally transmit data signals through the communication extension device 100. A first end of a multimode optical module 10 is connected to the first device 210. A signal amplification module 40 is connected between a second end of the multimode optical module 10 and a single-mode optical module 20. The single-mode optical module 20 is connected to the second device 220 via a single-mode optical fiber 30.

[0060] Specifically, the structure and working principle of the communication extension device 100 of the present application are as described above and will not be repeated here.

[0061] The first end of the multimode optical module 10 is connected to the first device 210. Specifically, the first device 210 and the multimode optical module 10 are connected via a multimode optical fiber. Because the communication extension device 100 includes a single-mode optical fiber, the communication extension device 100 of the present application can implement bidirectional data conversion between single-mode and multimode optical fibers. Similarly, when one end of the multimode optical module 10 is connected to the second device 220, the second device 220 and the multimode optical module 10 are also connected via a multimode optical fiber.

[0062] like Figure 2 As shown, the communication extension device 100 of the present application can be configured and installed at both ends of the first device 210 and the second device 220, thereby extending the data transmission distance between the first device 210 and the second device 220 through the communication extension device 100, thereby realizing two-way long-distance data transmission between the first device 210 and the second device 220.

[0063] The communication expansion device 100 is used to achieve communication connections between communication devices. The communication device of the present application can be a frequency converter. Correspondingly, the first device 210 can be a first frequency converter, and the second device 220 can be a second frequency converter. The first frequency converter can be a host, and the second frequency converter can be a slave. By connecting the communication expansion device 100 of the present application between the host and the slave, long-distance communication between the host and the slave can be achieved. It should be noted that the communication expansion device 100 of the present application is not limited to operating only in master-slave control conditions, but can also operate in conditions where multiple devices are controlled in parallel, which is not limited here.

[0064] It can be understood that in the related art, the multimode optical fiber link circuit between the master and slave devices of the first frequency converter as the master and the second frequency converter as the slave is as follows. Figure 4 As shown, the first frequency converter can be equipped with a multimode optical module, and similarly, the second frequency converter can also be equipped with a multimode optical module. The multimode optical module includes a multimode transmitting optical module and a multimode receiving optical module. The multimode optical module on the first frequency converter and the multimode optical module on the second frequency converter are connected via a multimode optical fiber. Because multimode optical fiber has a short transmission distance and a small bandwidth, the multimode optical module on the first frequency converter and the multimode optical module on the second frequency converter can achieve short-range communication between the first and second frequency converters through a multimode optical fiber connection, but cannot achieve long-range communication between the first and second frequency converters.

[0065] Therefore, if Figure 2 As shown, the present application configures the communication extension device 100 on the first device 210 and the second device 220, respectively, and enables long-distance communication between the first device 210 and the second device 220 via the single-mode optical fiber 30 in the communication extension device 100. This eliminates the need to modify the inverter itself or convert the inverter's original master-slave control signals into Ethernet protocol for transmission via Industrial Ethernet. This allows for long-distance communication between the first device 210 and the second device 220, resulting in a simple and fast connection.

[0066] In this way, the present application can extend the data transmission distance between the first device 210 and the second device 220 through the communication expansion device 100, thereby achieving bidirectional long-distance data transmission between the first and second devices. When the first and second devices 210 and 220 are master and slave devices of a frequency converter, there is no need to modify the frequency converter itself, nor is there any need to convert the original master-slave control signals of the frequency converter into Ethernet protocol for transmission via industrial Ethernet. Instead, the communication expansion device 100 of the present application can be added at an appropriate location in the multimode optical fiber link loop between the original master and slave devices to meet the requirements of long-distance master-slave control data transmission, which is simple and convenient.

[0067] It should be noted that the master-slave communication devices of the present application are not limited to inverters, but can also include other power electronic devices such as power quality control devices, such as static var generators (SVGs). Furthermore, the communication devices applicable to the communication expansion device 100 of the present application are not limited to a single device acting as the master, with other devices acting as slaves. Industrial computers, distributed control systems (DCSs), and supervisory control and data acquisition (SCADA) devices can be used as the master, with inverter-type power electronic devices acting as slaves.

[0068] In this way, the communication system 1000 of the present application can extend the data transmission distance between the first device 210 and the second device 220 through the communication expansion device 100, thereby achieving bidirectional long-distance data transmission between the first and second devices. When the first and second devices 210 and 220 are master and slave devices of a frequency converter, there is no need to modify the frequency converter itself, nor is there any need to convert the original master-slave control signals of the frequency converter into Ethernet protocol for transmission via industrial Ethernet. Instead, the communication expansion device 100 of the present application can be added at an appropriate location in the multimode optical fiber link loop between the original master and slave devices to meet the requirements of long-distance master-slave control data transmission, which is simple and convenient.

[0069] See also Figure 2 or Figure 3 In some embodiments, a communication system 1000 includes a first communication extension device 101 and a second communication extension device 102. The first communication extension device 101 and the second communication extension device 102 are connected via a single-mode optical fiber 30. A first end of the first communication extension device 101 is connected to a first device 210, a second end of the first communication extension device 101 is connected to a first end of the second communication extension device 102, and a second end of the second communication extension device 102 is connected to a second device 220. The first device 210 and the second device 220 bidirectionally transmit data signals via the first communication extension device 101 and the second communication extension device 102.

[0070] Specifically, the first communication extension device 101 and the second communication extension device 102 are connected via a single-mode optical fiber 30. The first communication extension device 101 is configured to plug into the first device 210, and the second communication extension device 102 is configured to plug into the second device 220, achieving plug-and-play operation. The communication system 1000 of the present application can implement long-distance data transmission between the first device 210 and the second device 220 through the first communication extension device 101 and the second communication extension device 102.

[0071] Alternatively, see Figure 2 and Figure 4 The communication system 1000 of this application is Figure 4 A first communication extension device 101 and a second communication extension device 102 are added to the transmission loop of the two multimode optical fibers. The first device 210 and the second device 220 are connected by two single-mode optical fibers between the first communication extension device 101 and the second communication extension device 102 to form a long-distance communication system.

[0072] like Figure 2 As shown, the receiving optical port of the multimode receiving optical module of the first communication extension device 101 is connected to the first device 210 via a multimode optical fiber, and the transmitting optical port of the multimode receiving optical module of the first communication extension device 101 is also connected to the first device 210 via a multimode optical fiber. The data transmission directions in the two multimode optical fibers are opposite and do not interfere with each other.

[0073] Similarly, the receiving optical port of the multimode receiving optical module of the second communication extension device 102 is connected to the second device 220 via a multimode optical fiber, and the transmitting optical port of the multimode receiving optical module of the second communication extension device 102 is also connected to the second device 220 via a multimode optical fiber. The data transmission directions in the two multimode optical fibers are opposite and do not interfere with each other.

[0074] The transmitting optical port of the single-mode bidirectional optical module of the first communication extension device 101 is connected to the second communication extension device 102 via the first single-mode optical fiber 31, and the receiving optical port of the single-mode bidirectional optical module of the first communication extension device 101 is connected to the second communication extension device 102 via the second single-mode optical fiber 32, thereby implementing a long-distance communication connection between the first device 210 and the second device 220. In other words, the first device 210 and the second device 220 of the present application can achieve long-distance communication via the two single-mode optical fibers, the first single-mode optical fiber 31 and the second single-mode optical fiber 32 in the communication extension device 100.

[0075] In this way, long-distance data transmission can be achieved between the first device 210 and the second device 220 in this embodiment by connecting the single-mode optical modules 20 of the first communication extension device 101 and the second communication extension device 102 to two single-mode optical fibers.

[0076] See also Figure 3 When there is only one single-mode optical fiber 30 , the first data signal sent by the first device 210 is transmitted to the transmitting and receiving optical port through the receiving optical port 111 , and is sent to the second device 220 through the single-mode optical fiber 30 .

[0077] The second data signal sent by the second device 220 is received by the transmitting and receiving optical port 23 through the single-mode optical fiber 30 , and is sent to the first device 210 through the transmitting optical port 122 .

[0078] Thus, the communication extension device 100 in this embodiment includes a single-mode bidirectional single-fiber optical module with wavelength division multiplexing, and only one single-mode optical fiber is needed to achieve long-distance bidirectional data transmission between the first device 210 and the second device 220, which has a simpler structure.

[0079] See also Figure 5 In some embodiments, there are multiple second devices 220, and the communication system 1000 further includes multiple second communication extension devices 102 connected to the multiple second devices 220. The multiple second devices 220 are connected in series through the multiple second communication extension devices 102 for data transmission, and the number of the second communication extension devices 102 is the same as the number of the second devices 220.

[0080] That is, when the communication system 1000 of the present application includes multiple second devices 220 , multiple second communication extension devices 102 can be configured and installed for the multiple second devices 220 , thereby achieving long-distance bidirectional data transmission between a first device 210 and multiple second devices 220 .

[0081] In some embodiments, there is one first device 210, one or more second devices 220, and the multiple second devices 220 are connected in series via multiple communication extension devices 100 to transmit data signals. When there are n second devices 220, where n>1, the second data signal emitted by the first second device 220, after being transmitted by n second devices 220, is then transmitted by the nth second device 220 via a single-mode optical fiber 30 to the receiving optical port of the single-mode optical module 20, and then transmitted to the first device 220 via the transmitting optical port of the multi-mode optical module 10.

[0082] For example, Figure 5 As shown, when there is one first device 210 and n is 3, that is, when there are three second devices 220, the three second devices 220 are connected and transmit data signals through three communication extension devices 100. The three communication extension devices 100 are communication extension devices T2, T3, and T4, respectively. The three second devices 220 are second device 221, second device 222, and third device 223, respectively. Communication extension device T2 is connected to communication extension device T3 via single-mode optical fiber 2, and communication extension device T3 is connected to communication extension device T4 via single-mode optical fiber 3.

[0083] In detail, when the first device 210 is a frequency converter belonging to the master and the second device 220 is a frequency converter belonging to the slave, when multiple frequency converters with one master and multiple slaves communicate over long distances, the wiring is as follows: Figure 5As shown, the first device 210 is inverter A, which acts as the master. It sends a control signal to the communication extension device T1 via multimode optical fiber 1. After being converted into a single-mode optical fiber signal by the communication extension device T2, it is transmitted to the communication extension device T2. The communication extension device T2 transmits the data signal to the second device 221 via multimode optical fiber 3. The second device 221 is inverter B, which acts as the slave 1. After receiving the signal from inverter A (the master), inverter B (slave 1) performs relevant operations according to the parsed instructions. At the same time, it sends the instruction data sent by inverter A (the master) and the operating status and data of inverter B (slave 1) to the communication extension device B via multimode optical fiber 4. The command data is converted into an optical signal and then transmitted to the communication extension device T3 via single-mode optical fiber 2. The communication extension device T3 converts the signal into an optical signal and then transmits it to the second device 222 via multimode optical fiber 5. The second device 222 is inverter C, which acts as the slave 2.

[0084] Similarly, when the last third device 223 (slave 3) receives the signal, it transmits the operating status of all slaves through the communication extension device T4 and the single-mode optical fiber 4 back to the receiving optical port of the single-mode bidirectional optical module of the communication extension device T1, and then sends the data to the inverter A (master), completing the entire communication process.

[0085] That is, by analogy, when the number of the second device 220 is n, when the last slave receives the signal, it sends the operating status of all slaves through the extension device Tn and back to the single-mode bidirectional optical module receiving port of the communication extension device A through the single-mode optical fiber 4, and then sends the data to the inverter A (host) to complete the entire communication process.

[0086] In this way, the communication extension device 100 of the present application can also be applied to long-distance communication between multiple inverters with one master and multiple slaves.

[0087] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A communication expansion device, characterized in that: The communication extension device includes a multi-mode optical module, a single-mode optical module, a single-mode optical fiber and a signal amplification module, wherein the signal amplification module is connected between the multi-mode optical module and the single-mode optical module, and the signal amplification module is used to amplify the data signal; The multi-mode optical module is used to receive a first data signal, and the single-mode optical module is used to send the first data signal amplified by the signal amplification module in a first direction through the single-mode optical fiber; The single-mode optical module is used to receive a second data signal through the single-mode optical fiber, and the multi-mode optical module is used to send the second data signal amplified by the signal amplification module in a second direction.

2. The communication expansion device according to claim 1, wherein: The multimode optical module includes a multimode receiving optical module and a multimode transmitting optical module, the multimode receiving optical module includes a first receiving optical port, the first receiving optical port is used to receive the first data signal, and the single-mode optical module includes a first transmitting optical port corresponding to the first receiving optical port, the first transmitting optical port is used to transmit the first data signal amplified by the signal amplification module through a first single-mode optical fiber; The multi-mode transmitting optical module includes a second transmitting optical port, which is used to send the second data signal amplified by the signal amplification module; the single-mode optical module includes a second receiving optical port corresponding to the second transmitting optical port, and the second receiving optical port is used to receive the second data signal through a second single-mode optical fiber.

3. The communication expansion device according to claim 1, wherein: The multimode optical module includes a multimode receiving optical module and a multimode transmitting optical module, the multimode receiving optical module includes a receiving optical port, the multimode transmitting optical module includes a transmitting optical port, the receiving optical port is used to receive the first data signal, and the transmitting optical port is used to send the second data signal amplified by the signal amplification module; The single-mode optical module is a single-mode bidirectional single-fiber optical module with wavelength division multiplexing. The single-mode bidirectional single-fiber optical module includes a transmitting and receiving optical port corresponding to both the receiving optical port and the transmitting optical port. The transmitting and receiving optical port is used to send the first data signal amplified by the signal amplification module through the single-mode optical fiber, and to receive the second data signal through the single-mode optical fiber.

4. The communication expansion device according to claim 2 or 3, characterized in that: The signal amplification module includes a first amplifier and a second amplifier. The first amplifier is connected between the multi-mode receiving optical module and the single-mode optical module. The second amplifier is connected between the multi-mode transmitting optical module and the single-mode optical module.

5. The communication expansion device according to claim 4, characterized in that: The single-mode optical module includes a first data transmission electrical port and a first data reception electrical port, wherein the first data transmission electrical port is connected to the first amplifier, and the first data reception electrical port is connected to the second amplifier; The multimode receiving optical module includes a second receiving data electrical port, and the multimode transmitting optical module includes a second sending data electrical port. The second receiving data electrical port is connected to the first amplifier, and the second sending data electrical port is connected to the second amplifier.

6. The communication expansion device according to claim 1, wherein: The single-mode optical module includes a single-mode transmitting optical module and a single-mode receiving optical module; The multi-mode optical module is used to receive the first data signal, and the single-mode transmitting optical module is used to send the first data signal amplified by the signal amplification module in a first direction; The single-mode receiving optical module is used to receive the second data signal, and the multi-mode optical module is used to send the second data signal amplified by the signal amplifying module in a second direction.

7. A communication system, characterized in that: The communication system includes a first device, a second device, and the communication extension device according to any one of claims 1 to 6. The first device and the second device bidirectionally transmit data signals through the communication extension device. The first end of the multi-mode optical module is connected to the first device. The signal amplification module is connected between the second end of the multi-mode optical module and the single-mode optical module. The single-mode optical module is connected to the second device through the single-mode optical fiber.

8. The communication system according to claim 7, wherein: The communication system includes a first communication extension device and a second communication extension device, wherein the first communication extension device and the second communication extension device are connected via the single-mode optical fiber; a first end of the first communication extension device is connected to the first device, a second end of the first communication extension device is connected to the first end of the second communication extension device, and a second end of the second communication extension device is connected to the second device; the first device and the second device bidirectionally transmit data signals via the first communication extension device and the second communication extension device.

9. The communication system according to claim 8, wherein: There are multiple second devices, and the communication system further includes multiple second communication extension devices connected to the multiple second devices. The multiple second devices are connected in series through the multiple second communication extension devices to perform data transmission, and the number of the second communication extension devices is the same as the number of the second devices.

10. The communication system according to claim 7, wherein: The number of the first device is one, the number of the second device is one or more, and the plurality of the second devices are connected in series via the plurality of the communication expansion devices to transmit the data signal; When there are n second devices, where n>1, the second data signal emitted by the first second device is transmitted by n second devices in sequence, and then sent by the nth second device to the receiving optical port of the single-mode optical module through the single-mode optical fiber, and is sent to the first device through the transmitting optical port of the multi-mode optical module.

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