CN115202252A - Optical fiber signal conversion equipment and system - Google Patents

Abstract

The embodiment of the invention relates to the technical field of real-time simulation, and discloses optical fiber signal conversion equipment and a system. The optical fiber signal conversion device comprises: the photoelectric conversion board, the back board and the core board; the photoelectric conversion panel includes: a high-speed photoelectric conversion panel and N low-speed photoelectric conversion panels; the high-speed photoelectric conversion board is used for sending the high-speed optical fiber signals sent by the MMC real-time simulator to the back board, and the low-speed photoelectric conversion board is used for sending the low-speed optical fiber signals sent by the MMC controller to the back board; the back board transmits the low-speed optical fiber signals and the high-speed optical fiber signals to the core board; the core board comprises an FPGA chip, and the FPGA chip is used for converting a low-speed optical fiber signal into a high-speed optical fiber signal and transmitting the converted high-speed optical fiber signal to the high-speed photoelectric conversion board through the back board; the FPGA chip is also used for converting the high-speed optical fiber signal into a low-speed optical fiber signal, and transmitting the converted low-speed optical fiber signal to the low-speed photoelectric conversion board through the backboard, so that the semi-physical simulation of the MMC controller can be realized.

Description

Optical fiber signal conversion equipment and system

Technical Field

The embodiment of the invention relates to the technical field of real-time simulation, in particular to optical fiber signal conversion equipment and a system.

Background

In recent years, flexible direct current based on Modular Multilevel Converter (MMC) technology has been widely researched and applied in the fields of renewable energy grid connection, asynchronous networking, and the like. The power modules and power electronic switching devices with huge numbers of MMCs greatly increase the complexity of the flexible direct current system, and bring greater challenges to the research and development, testing and full-life-cycle maintenance of the control protection system. Compared with field tests, real-time simulation has good controllability, no destructiveness and economy. In real-time simulation of an MMC, in general, a submodule solution with a huge number of MMCs is completed by a Field Programmable Gate Array (FPGA), and the remaining main circuit solution is executed by a heterogeneous CPU (Central Processing Unit), where the FPGA and the CPU communicate with each other through a low latency interface (PCIe), and in addition, an MMC model in the FPGA communicates with a controller through an optical fiber.

In the MMC simulator and the controller, data to be transmitted need to be sequentially sent or analyzed in serial, so that communication between the MMC simulator and the controller needs to be realized through high-speed optical fibers with limited quantity, and communication between the MMC simulator and the controller is realized in terms of system functions. And each submodule with the number up to thousands in the real MMC communicates with the controller by adopting independent low-speed optical fibers, so that a high-speed optical fiber communication mechanism between the MMC simulator and the controller is inconsistent with a communication mechanism between the real MMC and the controller, and the true semi-physical simulation of the controller cannot be realized.

In order to realize the semi-physical simulation of the MMC controller, firstly, an optical fiber signal conversion device is required to be designed to realize the conversion between a high-speed optical fiber signal and a low-speed optical fiber signal of the MMC simulator, so as to realize the one-to-one low-speed optical fiber connection between each submodule of the MMC model and the controller, the conversion from the low-speed optical fiber signal to the high-speed signal can be realized by adopting a plurality of distributed FPGAs (field programmable gate arrays), the plurality of FPGAs are communicated with a main control FPGA, and the main control FPGA is used for carrying out high-speed optical fiber communication with the MMC simulator, but the design cost of the mode is high, the power consumption is large, and the operation and maintenance are difficult.

Disclosure of Invention

The invention aims to provide optical fiber signal conversion equipment and a system, which can be used for realizing semi-physical simulation of an MMC controller, reduce the design cost and power consumption of the equipment and are easy to operate and maintain.

In order to solve the above technical problem, an embodiment of the present invention provides an optical fiber signal conversion apparatus, including: the photoelectric conversion board, the back board and the core board; the photoelectric conversion panel includes: a high-speed photoelectric conversion plate and N low-speed photoelectric conversion plates; the high-speed photoelectric conversion board is in communication connection with the MMC real-time simulator and is used for receiving a high-speed optical fiber signal sent by the MMC real-time simulator and sending the high-speed optical fiber signal to the back plate, and the low-speed photoelectric conversion board is in communication connection with the MMC controller and is used for receiving a low-speed optical fiber signal sent by the MMC controller and sending the low-speed optical fiber signal to the back plate; wherein N is an integer greater than or equal to 1; the back plate is in communication connection with the core board and the photoelectric conversion board at the same time, and is used for receiving a low-speed optical fiber signal sent by the low-speed photoelectric conversion board and a high-speed optical fiber signal sent by the high-speed photoelectric conversion board and forwarding the low-speed optical fiber signal and the high-speed optical fiber signal to the core board; the core board comprises an FPGA chip, the FPGA chip is used for converting the low-speed optical fiber signal into a high-speed optical fiber signal, and transmitting the converted high-speed optical fiber signal to the high-speed photoelectric conversion board through the back board, so that the high-speed photoelectric conversion board can transmit the converted high-speed optical fiber signal to the MMC real-time simulator; the FPGA chip is also used for converting the high-speed optical fiber signal into a low-speed optical fiber signal, and transmitting the converted low-speed optical fiber signal to the low-speed photoelectric conversion plate through the backboard, so that the low-speed photoelectric conversion plate can transmit the converted low-speed optical fiber signal to the MMC controller.

In order to solve the above technical problem, an embodiment of the present invention further provides an optical fiber signal conversion system, including: the MMC real-time simulator comprises an MMC real-time simulator, an MMC controller and at least one optical fiber signal conversion device; the optical fiber signal conversion equipment is in communication connection with the MMC real-time simulation machine and the MMC controller at the same time.

Compared with the prior art, the optical fiber signal conversion equipment comprises: the photoelectric conversion board, the back board and the core board; the photoelectric conversion panel includes: a high-speed photoelectric conversion panel and N low-speed photoelectric conversion panels; the high-speed photoelectric conversion board is in communication connection with the MMC real-time simulator and used for receiving a high-speed optical fiber signal sent by the MMC real-time simulator and sending the high-speed optical fiber signal to the back plate, and the low-speed photoelectric conversion board is in communication connection with the MMC controller and used for receiving a low-speed optical fiber signal sent by the MMC controller and sending the low-speed optical fiber signal to the back plate; wherein N is an integer greater than or equal to 1; the back plate is in communication connection with the core plate and the photoelectric conversion plate simultaneously and is used for receiving a low-speed optical fiber signal sent by the low-speed photoelectric conversion plate and a high-speed optical fiber signal sent by the high-speed photoelectric conversion plate and forwarding the low-speed optical fiber signal and the high-speed optical fiber signal to the core plate; the core board comprises an FPGA chip, the FPGA chip is used for converting a low-speed optical fiber signal into a high-speed optical fiber signal and transmitting the converted high-speed optical fiber signal to the high-speed photoelectric conversion board through the back board, and the high-speed photoelectric conversion board transmits the converted high-speed optical fiber signal to the MMC real-time simulator; the FPGA chip is also used for converting the high-speed optical fiber signal into a low-speed optical fiber signal, transmitting the converted low-speed optical fiber signal to the low-speed photoelectric conversion board through the backboard, and transmitting the converted low-speed optical fiber signal to the MMC controller by the low-speed photoelectric conversion board. The utility model provides a backplate is equivalent to the bridge of connecting photoelectric conversion board and core plate, high-speed fiber signal that receives from the real-time emulation machine of MMC with the photoelectric conversion board through the backplate and the low-speed fiber signal that receives from the MMC controller forwards to core plate, make the FPGA chip of core plate can realize the conversion of low-speed fiber signal and high-speed fiber signal, so that the high-speed fiber signal of the real-time emulation machine of MMC can send to the MMC controller after the conversion, the low-speed fiber signal of MMC controller can send to the real-time emulation machine of MMC after the conversion, the conversion between high-speed fiber signal and the low-speed fiber signal has been realized promptly, thereby the semi-physical simulation of MMC controller has been realized. And the equipment of the application only uses one FPGA chip, so that the design cost and the power consumption of the equipment are effectively reduced, and the operation and maintenance are easy.

In addition, each of the low-speed photoelectric conversion plates has M signal transmission channels and M signal reception channels, where M is an integer greater than or equal to 1; the backplane is specifically configured to perform differential-to-single-ended conversion on the low-speed optical fiber signals sent by the low-speed photoelectric conversion boards through the M signal sending channels, and forward the converted low-speed optical fiber signals to the core board; the back plate is further configured to perform single-end to differential conversion on the low-speed optical fiber signals sent by the FPGA chip, and forward the converted low-speed optical fiber signals to each of the low-speed photoelectric conversion boards through the M signal receiving channels of each of the low-speed photoelectric conversion boards. The optical fiber signals sent by the low-speed photoelectric conversion board and the core board are converted respectively through the backboard in the application, so that the core board and the low-speed photoelectric conversion board can successfully receive the corresponding optical fiber signals, and corresponding operation is completed.

In addition, the core board specifically receives the low-speed optical fiber signals forwarded by the backplane through the M × N pins of the FPGA chip, and sends the converted low-speed optical fiber signals to the backplane through the M × N pins. According to the optical fiber signal transmission device, the plurality of pins of the FPGA chip are used for transmitting and receiving a plurality of low-speed optical fiber signals, the plurality of FPGA chips are not needed, and the design cost and the power consumption of the device are effectively lowered.

In addition, the low-speed photoelectric conversion board adopts an SFP packaging format and is connected with the MMC controller through an LC interface. The low-speed photoelectric conversion board in the application adopts an SFP packaging format, and the interface is an LC interface, so that the transmission rate of optical fiber signals can be improved.

In addition, the high-speed photoelectric conversion plate is provided with K signal transceiving channels, and K is an integer greater than or equal to 1; the backplane is specifically configured to forward the high-speed optical fiber signals sent by the high-speed photoelectric conversion board through the K signal transceiving channels to the core board, and forward the converted high-speed optical fiber signals sent by the FPGA chip to the high-speed photoelectric conversion board through the K signal transceiving channels; the kernel board receives the high-speed optical fiber signals forwarded by the back board through K pins of the FPGA chip and sends the high-speed optical fiber signals obtained through conversion to the back board through the K pins. According to the optical fiber signal receiving and transmitting device, the plurality of high-speed optical fiber signals are transmitted and received through the plurality of pins of the FPGA chip, the plurality of FPGA chips are not needed, and the design cost and the power consumption of the device are effectively lowered.

In addition, the core board further includes: a DC-DC power converter and a crystal oscillator; the DC-DC power converter is used for converting the preset voltage of the optical fiber signal conversion equipment into the voltage required by the FPGA chip; the crystal oscillator is used for providing a clock source for the FPGA chip. According to the application, the preset power supply voltage is converted through the DC-DC power converter, so that the voltage can better meet the requirement of an FPGA chip.

In addition, the FPGA chip is also used for sending a high-speed optical fiber signal to the high-speed photoelectric conversion board through the backboard, receiving the high-speed optical fiber signal from the high-speed photoelectric conversion board forwarded by the backboard, sending a GMII signal and a UART signal to the high-speed photoelectric conversion board, sending the GMII signal and the UART signal to an upper computer of the optical fiber signal conversion equipment by the high-speed photoelectric conversion board, and receiving the GMII signal and the UART signal from the upper computer of the optical fiber signal conversion equipment sent by the high-speed photoelectric conversion board; the GMII signal and the UART signal are used for the optical fiber signal conversion equipment to communicate with an upper computer of the optical fiber signal conversion equipment. The FPGA chip in the application can realize the communication between the optical fiber signal conversion equipment and external equipment, namely the upper computer of the optical fiber signal conversion equipment, by sending the GMII signal and the UART signal to the high-speed photoelectric conversion plate and receiving the GMII signal and the UART signal sent by the high-speed photoelectric conversion plate from the upper computer of the optical fiber signal conversion equipment.

In addition, the core board further comprises a high-density connector for extending pins of the FPGA chip. The pin of the FPGA chip is expanded through the high-density connector, so that the optical fiber signal transmission requirements of photoelectric conversion plates with different quantities are met.

In addition, the back plate is connected with the photoelectric conversion plate through a CPCI connector. In the application, the CPCI connector is connected with the photoelectric conversion board and the backboard, so that the photoelectric conversion board can be expanded.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic diagram of a fiber-optic signal conversion device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a low-speed photoelectric conversion panel provided according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a pi filter provided in accordance with one embodiment of the present invention;

fig. 4 is a schematic diagram of a high-speed photoelectric conversion panel according to an embodiment of the present invention;

FIG. 5 is a schematic view of a backing plate provided in accordance with an embodiment of the present invention;

FIG. 6 is a schematic diagram of a core board provided in accordance with one embodiment of the present invention;

FIG. 7 is a schematic diagram of a programming of an FPGA chip according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a fiber-optic signal conversion system according to an embodiment of the present invention;

fig. 9 is a flowchart of an MMC simulation test according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.

The following description specifically describes implementation details of the optical fiber signal conversion device of this embodiment, and the following description is provided only for the sake of understanding and is not necessary for implementing this embodiment. Referring to fig. 1, a schematic structural diagram of the optical fiber signal conversion device in this embodiment specifically includes: photoelectric conversion board, backplate and core board.

Specifically, the photoelectric conversion panel includes: a high-speed photoelectric conversion panel and N low-speed photoelectric conversion panels; the high-speed photoelectric conversion board is in communication connection with the MMC real-time simulator and used for receiving a high-speed optical fiber signal sent by the MMC real-time simulator and sending the high-speed optical fiber signal to the back plate, and the low-speed photoelectric conversion board is in communication connection with the MMC controller and used for receiving a low-speed optical fiber signal sent by the MMC controller and sending the low-speed optical fiber signal to the back plate; wherein N is an integer greater than or equal to 1. The back plate is in communication connection with the core plate and the photoelectric conversion plate, and is used for receiving a low-speed optical fiber signal sent by the low-speed photoelectric conversion plate and a high-speed optical fiber signal sent by the high-speed photoelectric conversion plate and forwarding the low-speed optical fiber signal and the high-speed optical fiber signal to the core plate. The core board comprises an FPGA chip, the FPGA chip is used for converting low-speed optical fiber signals into high-speed optical fiber signals and sending the converted high-speed optical fiber signals to the high-speed photoelectric conversion board through the back board, and the high-speed photoelectric conversion board sends the converted high-speed optical fiber signals to the MMC real-time simulator; the FPGA chip is also used for converting the high-speed optical fiber signal into a low-speed optical fiber signal, transmitting the converted low-speed optical fiber signal to the low-speed photoelectric conversion board through the backboard, and transmitting the converted low-speed optical fiber signal to the MMC controller by the low-speed photoelectric conversion board.

In specific implementation, each module in the optical fiber signal conversion device communicates through an electrical signal, and therefore, after receiving a low-speed optical fiber signal from the MMC controller, the low-speed photoelectric conversion board converts the low-speed optical fiber signal into a low-speed interface signal, and sends the low-speed interface signal to the backplane, and the backplane forwards the low-speed interface signal to the core board, that is, the low-speed optical fiber signal transmitted in the optical fiber signal conversion device is the low-speed interface signal, and then after receiving the low-speed interface signal from the FPGA chip, the low-speed photoelectric conversion board converts the low-speed interface signal into the low-speed optical fiber signal, and sends the low-speed optical fiber signal to the MMC controller. Similarly, high-speed photoelectric conversion board can be high-speed optical fiber signal conversion high-speed interface signal after receiving the high-speed optical fiber signal who comes from the real-time emulation machine of MMC, and with high-speed interface signal transmission to backplate, supply the backplate to transmit high-speed interface signal to core plate, the high-speed optical fiber signal of the transmission in the optical fiber signal conversion equipment is high-speed interface signal promptly, then high-speed photoelectric conversion board is after receiving the high-speed interface signal that comes from the FPGA chip, can be high-speed optical fiber signal with high-speed interface signal conversion, and with high-speed optical fiber signal transmission to the real-time emulation machine of MMC.

Therefore, in this embodiment, the low-speed optical fiber signals transmitted in the optical fiber signal conversion device described below are all low-speed interface signals, and the high-speed optical fiber signals are all high-speed interface signals, which will not be described later.

In an embodiment, referring to fig. 2, a schematic diagram of the low-speed photoelectric conversion board is shown, the low-speed photoelectric conversion board is in communication connection with the MMC controller, and is configured to receive a low-speed optical fiber signal sent by the MMC controller, and send the low-speed optical fiber signal to the core board through the backplane, so that the core board converts the low-speed optical fiber signal into a high-speed optical fiber signal, and sends the converted low-speed optical fiber signal to the high-speed photoelectric conversion board through the backplane, and then the high-speed photoelectric conversion board sends the converted high-speed optical fiber signal to the MMC real-time simulator.

Since the low-speed photoelectric conversion board is in communication connection with the MMC controller, and the MMC controller needs to connect thousands of low-speed optical fibers externally, the photoelectric conversion board in this embodiment includes N low-speed photoelectric conversion boards, where each low-speed photoelectric conversion board has M signal transmission channels and M signal reception channels, that is, the signal transmission channel and the signal reception channel of the low-speed photoelectric conversion board are different. Wherein, M and N are integers which are more than or equal to 1, and the values of M and N are determined according to actual needs.

Specifically, the low-speed photoelectric conversion board includes M low-speed photoelectric conversion module connectors, and the low-speed photoelectric conversion module connectors are used for completing the receiving and sending of the low-speed optical fiber signals, that is, the low-speed photoelectric conversion module connectors are the sending and receiving channels of the low-speed optical fiber signals. The voltage required by each low-speed photoelectric conversion module connector when completing the receiving and sending of the low-speed optical fiber signal needs to be converted into the power supply voltage through the level conversion chip, for example, the voltage required by the low-speed photoelectric conversion module connector is 3.3V, the power supply voltage Vcc is 12V, and the level conversion chip is 12V to 3.3V, that is, the converted voltage of 3.3V (Vcc 3p 3) is provided for the low-speed photoelectric conversion module connector through the level conversion chip, so that the low-speed optical fiber signal receiving and sending are completed. It can be understood that the low-speed optical fiber signal sent by the low-speed photoelectric conversion module connector is a low-speed optical fiber signal sent to the core board through the backplane, and the low-speed optical fiber signal received by the low-speed photoelectric conversion module connector is a low-speed optical fiber signal obtained by conversion sent by the core board through the backplane.

In one example, after the level conversion chip converts the power voltage into the voltage required by the low-speed optoelectronic conversion module connector, the voltage is filtered by the pi-type filter to reduce the power ripple and provide a more stable voltage for the low-speed optoelectronic conversion module connector. The schematic diagram of the pi-type filter is shown in fig. 3, and the pi-type filter is composed of two bypass capacitors and a serially connected inductor, an Input of the pi-type filter is a voltage obtained by level conversion chip conversion, that is, a 3.3V voltage, an Output is a voltage (Vcc _ Rx) obtained by filtering, and the Output is Output to the photoelectric conversion module connector.

In one example, the low-speed photoelectric conversion board adopts an SFP (Small Form-factor plug cards) packaging format and is connected with the MMC controller through an LC interface. The low-speed photoelectric conversion board in this embodiment adopts an SFP packaging format, and the interface is an LC interface, which can improve the transmission rate of the optical fiber signal. It should be noted that the packaging format and the interface of the low-speed photoelectric conversion panel of the present embodiment may be preset according to the actual application scenario.

In one embodiment, referring to fig. 4, a schematic diagram of the high-speed photoelectric conversion board is shown, the high-speed photoelectric conversion board is in communication connection with the MMC real-time simulator, and is configured to receive a high-speed optical fiber signal sent by the MMC real-time simulator and send the high-speed optical fiber signal to the core board through the backplane, so that the core board converts the high-speed optical fiber signal into a low-speed optical fiber signal and sends the converted low-speed optical fiber signal to the low-speed photoelectric conversion board through the backplane, and then the low-speed photoelectric conversion board sends the converted low-speed optical fiber signal to the MMC controller.

The high-speed photoelectric conversion plate is provided with K signal receiving and transmitting channels, namely the signal receiving channel and the signal transmitting channel of the high-speed photoelectric conversion plate are the same, and K is an integer greater than or equal to 1.

Specifically, the high-speed photoelectric conversion panel includes K high-speed photoelectric conversion module connectors for completing reception and transmission of high-speed optical fiber signals, that is, the high-speed photoelectric conversion module connectors are transmission and reception channels of high-speed optical fiber signals. The voltage required by the high-speed photoelectric conversion module connector when receiving and sending high-speed optical fiber signals is similar to that of the low-speed photoelectric conversion module connector, the power supply voltage also needs to be converted through the level conversion chip, and after the power supply voltage is converted into the voltage required by the high-speed photoelectric conversion module connector through the level conversion chip, the voltage can be filtered through the pi-type filter, so that the details are similar to those of the low-speed photoelectric conversion board, and are not repeated. It can be understood that the high-speed optical fiber signal sent by the high-speed photoelectric conversion module connector is the high-speed optical fiber signal sent to the core board through the backplane, and the high-speed optical fiber signal received by the high-speed photoelectric conversion module connector is the high-speed optical fiber signal sent by the core board through the backplane and obtained through conversion.

In one example, the high-speed photoelectric conversion panel may further include: the GMII Interface is used for receiving GMII signals sent by the core board through a back board so as to send the GMII signals sent by the core board to an upper computer of the optical fiber signal conversion equipment, and meanwhile, the GMII Interface is also used for receiving the GMII signals from the upper computer of the optical fiber signal conversion equipment by the high-speed photoelectric conversion board and sending the GMII signals from the upper computer of the optical fiber signal conversion equipment to the core board; the UART interface is used for receiving the UART signal that core board sent through the backplate, with the host computer of the UART signal transmission who sends core board to fiber signal conversion equipment, simultaneously, the UART interface still is used for high-speed photoelectric conversion board to receive the UART signal that comes from fiber signal conversion equipment's host computer and sends the UART signal that comes from fiber signal conversion equipment's host computer to core board, can see out, high-speed photoelectric conversion board is through sending GMII signal and UART signal to core board, and receive GMII signal and UART signal from core board, can realize fiber signal conversion equipment and external equipment, the host computer of fiber signal conversion equipment communicates promptly.

Further, the photoelectric conversion plates, i.e., one high-speed photoelectric conversion plate and the N low-speed photoelectric conversion plates, are connected to the backplane through the CPCI connector. In this embodiment, the photoelectric conversion panel and the backplane are connected by the CPCI connector, so that the photoelectric conversion panel can be expanded.

In an embodiment, referring to fig. 5, since the backplane is communicatively connected to the core board and the photoelectric conversion board, the backplane is configured to receive a low-speed optical fiber signal sent by the low-speed photoelectric conversion board and a high-speed optical fiber signal sent by the high-speed photoelectric conversion board, and forward the low-speed optical fiber signal and the high-speed optical fiber signal to the core board, and meanwhile, the backplane is further configured to receive a high-speed optical fiber signal and a low-speed optical fiber signal obtained by conversion sent by the core board, so as to send the high-speed optical fiber signal obtained by conversion to the high-speed photoelectric conversion board, and send the low-speed optical fiber signal to the low-speed photoelectric conversion board.

In a specific implementation, each low-speed photoelectric conversion board has M signal transmission channels and M signal reception channels, and the backplane is specifically configured to perform differential-to-single-ended conversion on low-speed optical fiber signals transmitted by the low-speed photoelectric conversion boards through the M signal transmission channels, and forward the converted low-speed optical fiber signals to the core board; the back plate is also used for carrying out single-end conversion differential conversion on the low-speed optical fiber signals sent by the FPGA chip and forwarding the converted low-speed optical fiber signals to each low-speed photoelectric conversion plate through M signal receiving channels of each low-speed photoelectric conversion plate. In this embodiment, the backplane converts the low-speed optical fiber signals sent by the low-speed photoelectric conversion board and the core board, so that the core board and the low-speed photoelectric conversion board can successfully receive the corresponding low-speed optical fiber signals, thereby completing the corresponding operations.

Specifically, since the low-speed optical fiber signal received and sent by the low-speed photoelectric conversion module is a differential signal, and the low-speed optical fiber signal received and sent by the core board is a single-ended signal, it is necessary to perform differential-to-single-ended conversion on the low-speed optical fiber signal sent by the low-speed photoelectric conversion board through the backplane, forward the converted low-speed optical fiber signal to the core board, perform single-ended-to-differential conversion on the low-speed optical fiber signal sent by the FPGA chip, and forward the converted low-speed optical fiber signal to the low-speed photoelectric conversion board.

In a specific implementation, the high-speed photoelectric conversion board has K signal transceiving channels, and the backplane is specifically configured to forward the high-speed optical fiber signals sent by the high-speed photoelectric conversion board through the K signal transceiving channels to the core board, and forward the converted high-speed optical fiber signals sent by the FPGA chip to the high-speed photoelectric conversion board through the K signal transceiving channels, that is, the backplane does not need to convert the high-speed optical fiber signals sent by the high-speed photoelectric conversion board and the FPGA chip, and the backplane can directly forward the high-speed optical fiber signals to the corresponding module. In this embodiment, the high-speed optical fiber signals sent by the high-speed photoelectric conversion board and the core board are converted by the backplane, so that the core board and the high-speed photoelectric conversion board can successfully receive the corresponding high-speed optical fiber signals, thereby completing the corresponding operations.

In an example, the back plate is further configured to receive a GMII signal and a UART signal sent by the FPGA chip and forward the GMII signal and the UART signal to the high-speed photoelectric conversion board, and the back plate is further configured to receive the GMII signal and the UART signal sent by the high-speed photoelectric conversion board and forward the GMII signal and the UART signal to the FPGA chip.

It is understood that the back plate is also used for transmitting the voltage from the power supply board to the photoelectric conversion board, for example, the voltage is 12V, for the level conversion chip of the photoelectric conversion board to convert the power supply voltage, and filtering the voltage.

Further, the backplane is communicatively coupled to the core board via the high density connectors of the core board.

In one embodiment, a schematic diagram of a core board referring to fig. 6, the core board comprises: the FPGA chip is used for receiving a low-speed optical fiber signal forwarded by the back plate and coming from the low-speed photoelectric conversion plate, converting the low-speed optical fiber signal into a high-speed optical fiber signal, transmitting the converted high-speed optical fiber signal to the high-speed photoelectric conversion plate through the back plate, and transmitting the converted high-speed optical fiber signal to the MMC real-time simulator by the high-speed photoelectric conversion plate; meanwhile, the FPGA chip is also used for receiving a high-speed optical fiber signal forwarded by the back plate and coming from the high-speed photoelectric conversion plate, converting the high-speed optical fiber signal into a low-speed optical fiber signal, and sending the converted low-speed optical fiber signal to the low-speed photoelectric conversion plate through the back plate, so that the low-speed optical fiber signal obtained by conversion can be sent to the MMC controller by the low-speed photoelectric conversion plate.

The low-speed optical fiber signals received by the core board are low-speed optical fiber signals which are forwarded by the back board and sent by the N low-speed photoelectric conversion boards through the respective M signal sending channels, so that the core board specifically receives the low-speed optical fiber signals forwarded by the back board through the M pins and the N pins of the FPGA chip, the signal receiving channels of the low-speed photoelectric conversion boards are different from the signal sending channels, and each low-speed photoelectric conversion board is provided with the M signal sending channels and the M signal receiving channels, so that the core board specifically sends the converted low-speed optical fiber signals to the back board through the M pins and the N pins of the FPGA chip. That is, at least 2 × m × n pins are required for the FPGA chip of the core board to transmit and receive the low-speed optical fiber signal. In the embodiment, the plurality of pins of the FPGA chip are used for transmitting and receiving a plurality of low-speed optical fiber signals, a plurality of FPGA chips are not needed, and the design cost and the power consumption of the equipment are effectively reduced.

The high-speed optical fiber signal received by the core board is the high-speed optical fiber signal which is transmitted by the high-speed photoelectric conversion board which is forwarded by the back board through the K signal receiving and transmitting channels, so that the core board receives the high-speed optical fiber signal forwarded by the back board through the K pins of the FPGA chip, the signal receiving channels and the signal transmitting channels of the high-speed photoelectric conversion board are the same, and each high-speed photoelectric conversion board is provided with the K signal receiving and transmitting channels, therefore, the core board transmits the converted high-speed optical fiber signal to the high-speed photoelectric conversion board through the K pins of the FPGA chip. That is, the FPGA chip of the core board needs at least K pins to implement transmission and reception of high-speed optical fiber signals. In the embodiment, the plurality of pins of the FPGA chip are used for transmitting and receiving a plurality of high-speed optical fiber signals, a plurality of FPGA chips are not needed, and the design cost and the power consumption of the equipment are effectively reduced.

It should be noted that, the FPGA chip of this embodiment is used for completing at least K pins for transmitting and receiving high-speed optical fiber signals and 2 × m × n pins for completing transmitting and receiving low-speed optical fiber signals, and belongs to different types of pins, and the at least K pins for completing transmitting and receiving high-speed optical fiber signals are dedicated transmission pins for high-speed optical fiber signals.

In one example, the FPGA chip is further configured to transmit the GMII signal and the UART signal to the high-speed photoelectric conversion board and receive the GMII signal and the UART signal transmitted by the high-speed photoelectric conversion board while transmitting the high-speed optical fiber signal to the high-speed photoelectric conversion board through the backplane and receiving the high-speed optical fiber signal from the high-speed photoelectric conversion board forwarded by the backplane; and the GMII signal and the UART signal are used for the communication between the FPGA chip and an upper computer of the optical fiber signal conversion equipment. The GMII signal and the UART signal are used for realizing the communication between the optical fiber signal conversion device and external equipment.

Further, the core board further comprises a high-density connector, and the high-density connector is used for expanding pins of the FPGA chip. In this embodiment, the pins of the FPGA chip are extended by the high-density connector, so that the optical fiber signal transmission requirements of different numbers of photoelectric conversion boards are met. For example, when the number of the low-speed photoelectric conversion boards increases, the number of signal transmission channels and the number of signal reception channels of the low-speed photoelectric conversion boards also increase, and at this time, the number of pins of the FPGA chip needs to be increased to receive the low-speed optical fiber signals from the low-speed photoelectric conversion boards and send the low-speed optical fiber signals to the low-speed photoelectric conversion boards through the backplane.

In a specific implementation, the core board further comprises: the system comprises a DC-DC power converter and a crystal oscillator, wherein the DC-DC power converter is used for converting preset voltage of the optical fiber signal conversion equipment, namely voltage provided by a power panel into voltage required by an FPGA chip; the crystal oscillator is used for providing a clock source for the FPGA chip. In the embodiment, the preset power supply voltage is converted by the DC-DC power converter, so that the voltage more meets the requirement of the FPGA chip. It should be noted that, when the FPGA chip performs different operations, the required voltages may be different, that is, more than one voltage type is required by the FPGA chip, and therefore, the DC-DC power converter is required to provide different conversion voltages for the FPGA chip.

Further, the core board further includes: the device comprises an E2PROM chip, a QSPI Flash chip and a USB JTAG interface, wherein the E2PROM chip is used for storing user information of the device, the QSPI Flash chip is used for storing loading files of the FPGA chip, namely the files loaded when the FPGA chip runs, and the USB JTAG interface is used for monitoring and debugging the FPGA chip, for example, monitoring the internal signal time sequence and logic state of the FPGA chip.

In an example, referring to fig. 7, a programming function diagram of the FPGA chip of the present embodiment specifically includes: high speed fiber optic communications, low speed fiber optic communications, and network communications.

The high-speed optical fiber communication is the communication between the optical fiber signal conversion equipment and the MMC real-time simulation machine, namely, the transmission of the high-speed optical fiber signal between the optical fiber signal conversion equipment and the MMC real-time simulation machine is realized through the high-speed photoelectric conversion plate. The low-speed optical fiber communication is the communication between the optical fiber signal conversion device and the MMC controller, that is, the transmission of the low-speed optical fiber signal between the optical fiber signal conversion device and the MMC controller is realized through the low-speed photoelectric conversion board. The network communication is the communication between the optical fiber signal conversion equipment and the upper computer of the optical fiber signal conversion equipment, namely, the communication between the optical fiber signal conversion equipment and the upper computer of the optical fiber signal conversion equipment is realized through GMII signals and UART signals.

It is understood that the fiber-optic signal conversion device of the present embodiment may further include a power board, a switch, necessary LED status indications, and necessary peripheral circuits to assist in completing the conversion of the fiber-optic signal.

The above examples in the present embodiment are for convenience of understanding, and do not limit the technical aspects of the present invention.

In this embodiment, the optical fiber signal conversion apparatus includes: the photoelectric conversion board, the back board and the core board; the photoelectric conversion panel includes: a high-speed photoelectric conversion panel and N low-speed photoelectric conversion panels; the high-speed photoelectric conversion board is in communication connection with the MMC real-time simulator and used for receiving a high-speed optical fiber signal sent by the MMC real-time simulator and sending the high-speed optical fiber signal to the back plate, and the low-speed photoelectric conversion board is in communication connection with the MMC controller and used for receiving a low-speed optical fiber signal sent by the MMC controller and sending the low-speed optical fiber signal to the back plate; wherein N is an integer greater than or equal to 1; the back plate is in communication connection with the core plate and the photoelectric conversion plate simultaneously and is used for receiving a low-speed optical fiber signal sent by the low-speed photoelectric conversion plate and a high-speed optical fiber signal sent by the high-speed photoelectric conversion plate and forwarding the low-speed optical fiber signal and the high-speed optical fiber signal to the core plate; the core board comprises an FPGA chip, the FPGA chip is used for converting low-speed optical fiber signals into high-speed optical fiber signals and sending the converted high-speed optical fiber signals to the high-speed photoelectric conversion board through the back board, and the high-speed photoelectric conversion board sends the converted high-speed optical fiber signals to the MMC real-time simulator; the FPGA chip is also used for converting the high-speed optical fiber signal into a low-speed optical fiber signal, transmitting the converted low-speed optical fiber signal to the low-speed photoelectric conversion board through the backboard, and transmitting the converted low-speed optical fiber signal to the MMC controller by the low-speed photoelectric conversion board. The utility model provides a backplate is equivalent to the bridge of connecting photoelectric conversion board and core plate, high-speed fiber signal that receives from the real-time emulation machine of MMC with the photoelectric conversion board through the backplate and the low-speed fiber signal that receives from the MMC controller forwards to core plate, make the FPGA chip of core plate can realize the conversion of low-speed fiber signal and high-speed fiber signal, so that the high-speed fiber signal of the real-time emulation machine of MMC can send to the MMC controller after the conversion, the low-speed fiber signal of MMC controller can send to the real-time emulation machine of MMC after the conversion, the conversion between high-speed fiber signal and the low-speed fiber signal has been realized promptly, thereby the semi-physical simulation of MMC controller has been realized. And the equipment of the application only uses one FPGA chip, so that the design cost and the power consumption of the equipment are effectively reduced, and the operation and maintenance are easy.

Another embodiment of the present invention relates to an optical fiber signal conversion system, which is applied in an MMC real-time simulation application scenario, and the implementation details of the optical fiber signal conversion system of the present embodiment are specifically described below, and the following description is only provided for facilitating understanding of the implementation details, and is not necessary for implementing the present solution. Referring to fig. 8, a schematic structural diagram of the optical fiber signal conversion system of this embodiment specifically includes: the system comprises an MMC real-time simulator, an MMC controller and a plurality of optical fiber signal conversion devices; the optical fiber signal conversion equipment is in communication connection with the MMC real-time simulation machine and the MMC controller at the same time.

In specific implementation, the optical fiber signal conversion system further comprises an upper computer of the MMC real-time simulation machine, an upper computer of the optical fiber signal conversion equipment and a network switch.

Specifically speaking, optical fiber signal conversion equipment is used for receiving the low-speed fiber signal that the MMC controller sent, converts low-speed fiber signal into high-speed fiber signal to high-speed fiber signal that will obtain through the conversion send to the real-time emulation machine of MMC, simultaneously, optical fiber signal conversion equipment still is used for receiving the high-speed fiber signal that the real-time emulation machine of MMC sent, converts high-speed fiber signal into low-speed fiber signal to low-speed fiber signal that will obtain through the conversion send to the MMC controller, this embodiment can realize the conversion between high-speed fiber signal and the low-speed fiber signal promptly, with the communication between real-time emulation machine of realization MMC and the MMC controller.

The optical fiber signal conversion device in the above embodiment is the optical fiber signal conversion device, and since the MMC controller needs to connect thousands of low-speed optical fibers externally, a plurality of optical fiber signal conversion devices are needed to realize interface expansion of the high-speed optical fibers with limited number of the MMC real-time simulator. In addition, each of the N low-speed photoelectric conversion boards of the optical fiber signal conversion device has M signal transmission channels and M signal reception channels, so that one optical fiber signal conversion device can be connected to M × N low-speed optical fibers of the MMC controller, and P optical fiber signal conversion devices are shown in the figure, that is, can be connected to P × M low-speed optical fibers of the MMC controller.

It should be understood that this embodiment is a system example corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the first embodiment.

It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.

In an embodiment, the fiber signal conversion system according to the embodiment of the present invention may be used for testing MMC simulation, and a flowchart of the MMC simulation test refers to fig. 9, where the device to be tested is an MMC controller, and the accompanied side device is an MMC real-time simulator, an upper computer of the MMC real-time simulator, a plurality of fiber signal conversion devices, a network switch, and an upper computer of the fiber signal conversion device, and specifically includes:

step 901, preparing a device to be tested.

Step 902, detecting whether the device to be tested is complete. If the equipment to be tested is not complete, the step 901 is returned, and if the equipment to be tested is complete, the step 903 is entered.

Step 903, preparing the companion device.

And step 904, detecting whether the accompanied device is complete. If the companion device is not equipped, the process returns to step 903, and if the companion device is equipped, the process proceeds to step 905.

Step 905, connecting the MMC emulation machine to a high-speed optical fiber among a plurality of optical fiber signal conversion devices.

Step 906, detecting whether the connection of the high-speed optical fiber is normal, if the connection of the high-speed optical fiber is not normal, returning to step 905, and if the connection of the high-speed optical fiber is normal, entering step 907.

Step 907, connect the MMC controller to the low speed fiber between the multiple fiber optic signal conversion devices.

Step 908, detecting whether the connection of the low speed optical fiber is normal, if the connection of the low speed optical fiber is not normal, returning to step 907, if the connection of the low speed optical fiber is normal, entering step 909.

And step 909, powering on the device to be tested and the accompanying side device.

And step 910, starting the MMC real-time simulator and the MMC controller.

And 911, observing the control effect of the MMC controller on the MMC simulation model and recording test data.

Step 912, determine whether to restart the test. If it is determined that the test is to be started again, step 910 is entered, otherwise step 913 is entered.

And 913, powering down the device to be tested and the accompanying device.

The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (10)

1. A fiber optic signal conversion device, comprising: the photoelectric conversion board, the back board and the core board;

the photoelectric conversion panel includes: a high-speed photoelectric conversion panel and N low-speed photoelectric conversion panels; the high-speed photoelectric conversion board is in communication connection with the MMC real-time simulator and is used for receiving a high-speed optical fiber signal sent by the MMC real-time simulator and sending the high-speed optical fiber signal to the back plate, and the low-speed photoelectric conversion board is in communication connection with the MMC controller and is used for receiving a low-speed optical fiber signal sent by the MMC controller and sending the low-speed optical fiber signal to the back plate; wherein N is an integer greater than or equal to 1;

the back plate is in communication connection with the core board and the photoelectric conversion board at the same time, and is used for receiving a low-speed optical fiber signal sent by the low-speed photoelectric conversion board and a high-speed optical fiber signal sent by the high-speed photoelectric conversion board and forwarding the low-speed optical fiber signal and the high-speed optical fiber signal to the core board;

the core board comprises an FPGA chip, the FPGA chip is used for converting the low-speed optical fiber signals into high-speed optical fiber signals, the converted high-speed optical fiber signals are sent to the high-speed photoelectric conversion board through the back board, and the high-speed photoelectric conversion board sends the converted high-speed optical fiber signals to the MMC real-time simulator;

the FPGA chip is also used for converting the high-speed optical fiber signal into a low-speed optical fiber signal, and transmitting the converted low-speed optical fiber signal to the low-speed photoelectric conversion plate through the backboard, so that the low-speed photoelectric conversion plate can transmit the converted low-speed optical fiber signal to the MMC controller.

2. The optical fiber signal conversion apparatus according to claim 1, wherein each of the low-speed photoelectric conversion panels has M signal transmission channels and M signal reception channels, M being an integer greater than or equal to 1;

the backplane is specifically configured to perform differential-to-single-ended conversion on the low-speed optical fiber signals sent by the low-speed photoelectric conversion boards through the M signal sending channels, and forward the converted low-speed optical fiber signals to the core board;

the back plate is further configured to perform single-end to differential conversion on the low-speed optical fiber signals sent by the FPGA chip, and forward the converted low-speed optical fiber signals to each of the low-speed photoelectric conversion boards through the M signal receiving channels of each of the low-speed photoelectric conversion boards.

3. The fiber optic signal conversion device of claim 2, wherein the core board receives the low-speed fiber optic signal forwarded by the backplane via the M × N pins of the FPGA chip, and transmits the converted low-speed fiber optic signal to the backplane via the M × N pins.

4. The fiber-optic signal conversion device of claim 1, wherein the low-speed photoelectric conversion board is in an SFP package format and is connected to the MMC controller through an LC interface.

5. The fiber-optic signal conversion device according to claim 1, wherein the high-speed photoelectric conversion plate has K signal transceiving channels, where K is an integer greater than or equal to 1;

the backplane is specifically configured to forward the high-speed optical fiber signals sent by the high-speed photoelectric conversion board through the K signal transceiving channels to the core board, and forward the converted high-speed optical fiber signals sent by the FPGA chip to the high-speed photoelectric conversion board through the K signal transceiving channels;

the core board receives the high-speed optical fiber signals forwarded by the back board through the K pins of the FPGA chip, and sends the converted high-speed optical fiber signals to the back board through the K pins.

6. The fiber optic signal conversion device of claim 1, wherein the core board further comprises: a DC-DC power converter and a crystal oscillator;

the DC-DC power converter is used for converting the preset voltage of the optical fiber signal conversion equipment into the voltage required by the FPGA chip; the crystal oscillator is used for providing a clock source for the FPGA chip.

7. The fiber signal conversion device according to claim 6, wherein the FPGA chip is further configured to send a GMII signal and a UART signal to the high-speed photoelectric conversion board while sending the high-speed fiber signal to the high-speed photoelectric conversion board through the backplane and receiving the high-speed fiber signal from the high-speed photoelectric conversion board forwarded by the backplane, so that the high-speed photoelectric conversion board sends the GMII signal and the UART signal to an upper computer of the fiber signal conversion device and receives the GMII signal and the UART signal from the upper computer of the fiber signal conversion device sent by the high-speed photoelectric conversion board;

the GMII signal and the UART signal are used for the optical fiber signal conversion equipment to communicate with an upper computer of the optical fiber signal conversion equipment.

8. The fiber optic signal conversion device of any of claims 1-7, wherein the core board further comprises a high density connector for extending pins of the FPGA chip.

9. The fiber optic signal conversion device of any of claims 1-7, wherein the photoelectric conversion board is connected to the backplane by a CPCI connector.

10. A fiber optic signal conversion system, comprising: an MMC real-time emulator, an MMC controller and at least one fibre-optic signal conversion device according to any one of claims 1 to 9; the optical fiber signal conversion equipment is in communication connection with the MMC real-time simulation machine and the MMC controller at the same time.

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