Centralized DTU

Abstract

The invention discloses a centralized DTU, which relates to the technical field of electric power equipment. It includes: a main control module, a remote control bus driving module, a remote signaling bus driving module, a telemetry bus driving module, a plurality of remote control extension modules, a plurality of remote signaling extension modules, a plurality of telemetry extension modules and a programmable logic module. The remote control bus driving module, the remote signaling bus driving module and the telemetry bus driving module are all electrically connected to the main control module, and each remote control extension module is electrically connected to the remote control bus driving module; each remote signaling extension module is electrically connected to the remote signaling bus driving module; each telemetry extension module is electrically connected to the telemetry bus driving module; the programmable logic module is electrically connected to the main control module, the remote control bus driving module, the remote signaling bus driving module, the telemetry bus driving module, the remote control extension module, the remote signaling extension module and the telemetry extension module. The centralized DTU according to the embodiment of the present invention can reduce the burden and improve the communication speed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a centralized DTU. Background Art

[0002] Centralized DTU is a power automation terminal device, mainly used for centralized management and transmission of data from multiple terminal devices. Centralized DTU uses high-performance MCU processors, high-speed industrial network communication technology, multi-CPU integration technology, embedded industrial chipsets and Linux operating system. It has the characteristics of high stability, strong reliability, good real-time performance, wide adaptability to the environment, and powerful functions. It is mainly used in distribution network ring network cabinets, switchgear, box-type substations and other equipment. When used in combination with the distribution master station, it can quickly and reliably realize the fault location and isolation of the distribution network and the restoration of power supply to non-fault sections. Centralized DTU provides a new generation of distribution automation remote terminal equipment that integrates telemetry, telesignaling, remote control, protection and communication functions.

[0003] At present, traditional centralized DTU equipment has the following disadvantages:

[0004] 1. In order to make up for the deficiency of its own ports, the centralized DTU uses the microcontroller port to realize remote control output, but it needs to collect remote signal data through the serial port, which has a certain time delay and increases the burden of the software system and programming work.

[0005] 2. Some centralized DTU remote control output and remote signal collection are realized through IIC chip, the communication speed is only 400KHz, the chip itself does not have high impedance state, and an external output control chip is required.

[0006] 3. The remote signal is collected through the SPI bus interface of AD7616. The highest clock frequency tested is only 40MHz. Because it is a serial port, the time spent is basically more than 5 times that of bus transmission. Summary of the invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a centralized DTU, which can improve the communication speed and reduce the burden of the system.

[0008] A centralized DTU according to an embodiment of the present invention includes:

[0009] Main control module;

[0010] A remote control bus driving module, electrically connected to the main control module;

[0011] A remote signal bus drive module, electrically connected to the main control module;

[0012] A telemetry bus driving module, electrically connected to the main control module;

[0013] A plurality of remote control expansion modules, each of which is electrically connected to the remote control bus driving module and is used to output a remote control signal;

[0014] A plurality of remote signaling extension modules, each of which is electrically connected to the remote signaling bus driving module and is used for receiving remote signaling signals;

[0015] A plurality of telemetry expansion modules, each of which is electrically connected to the telemetry bus driving module and is used to receive telemetry signals;

[0016] The programmable logic module is electrically connected to the main control module, the remote control bus driving module, the remote signaling bus driving module, the telemetry bus driving module, a plurality of the remote control extension modules, a plurality of the remote signaling extension modules and a plurality of the telemetry extension modules.

[0017] According to some embodiments of the present invention, the remote control expansion module includes a data latch and a dual power bus transceiver, the data latch is electrically connected to the remote control bus driver module and the programmable logic module respectively, the dual power bus transceiver is electrically connected to the data latch, and the dual power bus transceiver is used to output the remote control signal.

[0018] According to some embodiments of the present invention, the dual power bus transceiver has a chip enable pin, the chip enable pin is electrically connected to the main control module, and the chip enable pin is connected to a pull-up resistor; the data latch has a first select pin, and the first select pin is electrically connected to the programmable logic module.

[0019] According to some embodiments of the present invention, the main control module uses at least two address lines for decoding.

[0020] According to some embodiments of the present invention, the programmable logic module selects a plurality of the remote control expansion modules, a plurality of the remote signaling expansion modules, and a plurality of the telemetry expansion modules according to a selection signal.

[0021] According to some embodiments of the present invention, the remote signaling expansion module includes a remote signaling signal transceiver, which has multiple signal input terminals and multiple signal output terminals, each of the signal input terminals corresponds one-to-one to each of the signal output terminals, each of the signal input terminals is used to receive a remote signaling signal, and each of the signal output terminals is used to send the remote signaling signal to the main control module; the remote signaling signal transceiver has a second enable pin, and the second enable pin is electrically connected to the programmable logic module.

[0022] According to some embodiments of the present invention, the telemetry expansion module includes an analog-to-digital converter, which is used to receive a telemetry signal, perform analog-to-digital conversion on the telemetry signal, and then send it to the main control module; the analog-to-digital converter has a third enable pin, and the third enable pin is electrically connected to the programmable logic module.

[0023] According to some embodiments of the present invention, each remote control expansion module can output at least 16 remote control signals, each remote signaling expansion module can receive at least 16 remote signaling signals, and each remote measurement expansion module can receive at least 16 remote measurement signals.

[0024] According to some embodiments of the present invention, the main control module includes a CPU of model AM6442.

[0025] According to some embodiments of the present invention, the programmable logic module includes a CPLD.

[0026] The centralized DTU according to the embodiment of the present invention has at least the following beneficial effects: by adopting the remote control bus driver module, the remote signal bus driver module and the telemetry bus driver module, the driving force of the main control module can be enhanced, and the main control module only needs to be connected to three bus driver chips, and then the three bus driver chips are used to connect a plurality of remote control expansion modules, a plurality of remote signal expansion modules and a plurality of telemetry expansion modules, thereby expanding the bus interface, reducing the system burden, expanding the signal routes of the system's telesignaling, telemetry and remote control, and improving the bus speed.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 Schematic diagram of the structure of a centralized DTU according to an embodiment of the present invention;

[0030] Figure 2 A circuit schematic diagram of a programmable logic module according to an embodiment of the present invention;

[0031] Figure 3 1 is a circuit schematic diagram of a remote control bus driving module and a remote signaling bus driving module according to an embodiment of the present invention;

[0032] Figure 4 is a circuit schematic diagram of a telemetry bus driver module according to an embodiment of the present invention;

[0033] Figure 5is a circuit schematic diagram of a part of the remote control expansion module of an embodiment of the present invention;

[0034] Figure 6 is a circuit schematic diagram of another part of the remote control expansion module of an embodiment of the present invention;

[0035] Figure 7 is a circuit schematic diagram of a part of the remote signaling expansion module of an embodiment of the present invention;

[0036] Figure 8 is a circuit schematic diagram of another part of the remote signaling expansion module of an embodiment of the present invention;

[0037] Fig. 9 is a circuit schematic diagram of a portion of a telemetry expansion module of an embodiment of the present invention;

[0038] Fig.10 It is a circuit schematic diagram of another part of the telemetry expansion module of the embodiment of the present invention. DETAILED DESCRIPTION

[0039] Embodiments of the present invention 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 are not to be construed as limitations on the present application. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0040] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0042] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] DTU: Data Transfer Unit, a device specifically used for remote data transmission. It is widely used in various communication networks, especially in the field of Internet of Things (IoT), to realize remote data collection, transmission and monitoring. DTU connects to remote terminal devices through wireless networks (such as GPRS, CDMA, NB-IoT, LoRa, 4G / 5G, etc.) or wired networks (such as Ethernet) to achieve transparent data transmission.

[0044] CPLD: Complex Programmable Logic Device, complex programmable logic device, used to implement digital logic functions.

[0045] Centralized DTU is a power automation terminal device, mainly used for centralized management and transmission of data of multiple terminal devices. Centralized DTU adopts high-performance MCU processor, high-speed industrial network communication technology, multi-CPU integration technology, embedded industrial chipset and Linux operating system. It has the characteristics of high stability, strong reliability, good real-time performance, wide adaptability and powerful functions. It is mainly used in ring network cabinets, switchgears, box-type substations and other equipment of distribution networks. When used in combination with distribution master stations, it can quickly and reliably realize fault location and isolation of distribution networks and restore power supply to non-fault sections. Centralized DTU provides a new generation of distribution automation remote terminal equipment that integrates telemetry, telesignaling, remote control, protection and communication functions. The advantages of centralized DTU include: centralized DTU can centrally manage all data and facilitate data processing and analysis; centralized DTU can reduce system deployment and maintenance costs and save hardware and software resources; centralized DTU can better control the security and reliability of data and avoid the risk of data loss and leakage; centralized DTU can better realize data integration and analysis and improve the efficiency and quality of data processing.

[0046] However, the current traditional centralized DTU equipment has the following disadvantages:

[0047] 1. In order to make up for the deficiency of its own ports, the centralized DTU uses the microcontroller port to realize remote control output, but it needs to collect remote signal data through the serial port, which has a certain time delay and increases the burden of the software system and programming work.

[0048] 2. Some centralized DTU remote control output and remote signal collection are realized through IIC chip, the communication speed is only 400KHz, the chip itself does not have high impedance state, and an external output control chip is required.

[0049] 3. The remote signal is collected through the SPI bus interface of AD7616. The highest clock frequency tested is only 40MHz. Because it is a serial port, the time spent is basically more than 5 times that of bus transmission.

[0050] In view of the above shortcomings, and according to the latest requirements of the current State Grid standardized centralized DTU: 64-channel telemetry, 56-channel telesignaling and 24-channel remote control, the embodiment of the present invention proposes a centralized DTU, which can enhance the driving force of the main control module by adopting a remote control bus driver module, a remote signaling bus driver module and a telemetry bus driver module, and the main control module only needs to connect three bus driver chips, and then connect several remote control expansion modules, several remote signaling expansion modules and several telemetry expansion modules through these three bus driver chips, so as to expand the bus interface, reduce the system burden, and expand the signal routes of the system's remote signaling, telemetry and remote control, and improve the bus speed. The centralized DTU can realize at least 64-channel remote control, 64-channel telesignaling and 64-channel telemetry, meet the requirements of the State Grid standardized centralized DTU, and can be combined with the board design to flexibly configure the number of interfaces by allocating the number of plug-in cards.

[0051] like Figure 1 As shown, the centralized DTU according to the embodiment of the present invention includes: a main control module 100, a remote control bus driver module 200, a remote signal bus driver module 300, a telemetry bus driver module 400, a plurality of remote control extension modules 500, a plurality of remote signal extension modules 600, a plurality of telemetry extension modules 700 and a programmable logic module 800. The remote control bus driver module 200 is electrically connected to the main control module 100, the remote signal bus driver module 300 is electrically connected to the main control module 100, and the telemetry bus driver module 400 is electrically connected to the main control module 100; each remote control extension module 500 is electrically connected to the remote control bus driver module 200 for outputting remote control signals; each remote signal extension module 600 is electrically connected to the remote signal bus driver module 300 for receiving remote signal signals; each telemetry extension module 700 is electrically connected to the telemetry bus driver module 400 for receiving telemetry signals; the programmable logic module 800 is electrically connected to the main control module, the remote control bus driver module 200, the remote signal bus driver module 300, the telemetry bus driver module 400, a plurality of remote control extension modules 500, a plurality of remote signal extension modules 600, and a plurality of telemetry extension modules 700, respectively.

[0052] Specifically, the main control module 100 is used to control the input of telesignaling signals and telemetry signals, as well as the output of remote control signals, and is responsible for controlling the operating state of the entire system. In this example, the main control module 100 includes a CPU, which uses TI's AM6442 chip, which has a native 5-way Gigabit network port, a 16-bit GPMC data bus and a bus speed of 133Mhz; dual-core ARM Cortex-A53, with a main frequency of up to 1.0GHz; single / quad-core Cortex-R5F, real-time processing core, with a main frequency of up to 800MHz, and a computing power of up to 6720DMIPS. It should be noted that the CPU can also use other types of chips according to actual needs, and is not limited to this.

[0053] The programmable logic module 800 is responsible for the chip selection decoding and logic control of the entire system, such as Figure 2 As shown, in this example, the programmable logic module 800 includes a CPLD, which has the characteristics of low cost, flexible control programming, and stable and reliable chips, and is a key component of the entire system. Figure 2As shown in the example, the CPLD model used is EPM240T100 / AG256SL100, where, when there are 64 remote signaling signals in total, GPMC0_CS2nA_YX1#, GPMC0_CS2nB_YX2#, GPMC0_CS2nC_YX3#, GPMC0_CS2nD_YX4# are remote signaling selection signals, which are used to select the corresponding remote signaling expansion module 600, and when there are 128 remote signaling signals in total, GPMC0_CS2nA_YX1#, GPMC0_CS2nB_YX2#, GPMC0_CS2nC_YX3#, GPMC0_CS2nD_YX4# are remote signaling selection signals, which are used to select the corresponding remote signaling expansion module 600. When there are 64 remote control signals, GPMC0_CS2nE_YX5#, GPMC0_CS2nF_YX6#, GPMC0_CS2nG_YX7#, and GPMC0_CS2nH_YX8# are used as standby remote signal selection signals; similarly, when there are 64 remote control signals in total, GPMC0_CS1nA_YK1, GPMC0_CS1nB_YK2, GPMC0_CS1nC_YK3, and GPMC0_CS1nD _YK4 is the remote control selection signal, which is used to select the corresponding remote control expansion module 500. When there are 128 remote signal signals in total, GPMC0_CS1nE_YK5, GPMC0_CS1nF_YK6, GPMC0_CS1nG_YK7, and GPMC0_CS1nH_YK8 are used as standby remote control selection signals; when there are 64 telemetry signals in total, GPMC0_CS0nA_YC1#, GPMC0_CS0n B_YC2#, GPMC0_CS0nC_YC3#, GPMC0_CS0nD_YC4# are telemetry selection signals, which are used to select the corresponding telemetry expansion module 700. When there are a total of 128 telesignaling signals, GPMC0_CS0nE_YC5#, GPMC0_CS0nF_YC6#, GPMC0_CS0nG_YC7#, GPMC0_CS0nH_YC8# are used as backup telemetry selection signals.

[0054] like Figure 3 and Figure 4The remote control bus driver module 200, the remote signal bus driver module 300 and the telemetry bus driver module 400 of the embodiment of the present invention are shown. Specifically, the remote signal bus driver module 300 includes a bus driver chip U317 for enhancing the driving capability of the CPU remote signal bus; the remote control bus driver module 200 includes a bus driver chip U318 for enhancing the driving capability of the CPU remote control bus; and the telemetry bus driver module 400 includes a bus driver chip U307 for enhancing the driving capability of the CPU telemetry bus. These three bus driver chips can enhance the driving capability of the CPU bus, so that there are only three chips directly connected to the GPMC bus of the CPU, and each chip drives several remote control expansion modules 500, several remote signal expansion modules 600 and several telemetry expansion modules 700 below, so as to avoid the CPU bus directly connecting to the expansion module, resulting in insufficient bus driving capability. Among them, GPMC0_AD0- GPMC0_AD15 of the bus driver chip U318 is used to connect the GPMC bus of the CPU, and GPMC0_AD0_YK- GPMC0_AD15_YK of the bus driver chip U318 is a remote control data bus, which is used to connect several remote control expansion modules 500. GPMC0_AD0- GPMC0_AD15 of the bus driver chip U317 is used to connect the GPMC bus of the CPU, and GPMC0_AD0_YX- GPMC0_AD15_YX of the bus driver chip U317 is a telemetering data bus, which is used to connect several telemetering expansion modules 600. GPMC0_AD0- GPMC0_AD15 of the bus driver chip U307 is used to connect the GPMC bus of the CPU, and GPMC0_AD0_YC- GPMC0_AD15_YC of the bus driver chip U317 is a telemetry data bus, which is used to connect several telemetry expansion modules 700.

[0055] In some embodiments of the present invention, each remote control expansion module 500 includes a data latch and a dual power bus transceiver, the data latch is electrically connected to the remote control bus driver module 200 and the programmable logic module 800, the dual power bus transceiver is electrically connected to the data latch, and the dual power bus transceiver is used to output the remote control signal. Specifically, Figure 5 and Figure 6As shown, in this example, a total of four remote control expansion modules 500 are shown. The first remote control expansion module 500 includes a data latch U299 and a dual-power bus transceiver U300, the second remote control expansion module 500 includes a data latch U301 and a dual-power bus transceiver U302, the third remote control expansion module 500 includes a data latch U303 and a dual-power bus transceiver U304, and the fourth remote control expansion module 500 includes a data latch U305 and a dual-power bus transceiver U306. The four remote control expansion modules 500 have a total of 64 remote control signal outputs, namely DO1-DO64 shown in the figure. The four remote control expansion modules 500 are selected by four chip selection signals GPMC0_CS1nA_YK1, GPMC0_CS1nB_YK2, GPMC0_CS1nC_YK3, and GPMC0_CS1nD_YK4 decoded by GPMC0_CS1n and A22, A21 of the programmable logic module 800, so that the selected remote control expansion module 500 sends the remote control signal to the port, and the high level is effective. Among them, the data latches U299, U301, U303 and U305 all use the chip model AiP74LVC16373 for temporary storage of data, and the dual power bus transceivers U300, U302, U304 and U306 are used to send out remote control signals according to the control signal of the CPU.

[0056] In this example, the dual power bus transceivers U300, U302, U304 and U306 have a chip enable pin, which is electrically connected to the main control module 100 and connected to a pull-up resistor; the data latch has a first selection pin, which is electrically connected to the programmable logic module 800. Specifically, Figure 5 and Figure 6As shown, the chip enable pins of the dual power bus transceiver U300 are KOUTEN_YK10 and KOUTEN_YK11, and the connected pull-up resistors are R1032 and R1033; the chip enable pins of the dual power bus transceiver U302 are KOUTEN_YK20 and KOUTEN_YK21, and the connected pull-up resistors are R1034 and R1035; the chip enable pins of the dual power bus transceiver U304 are KOUTEN_YK30 and KOUTEN_YK31, and the connected pull-up resistors are R1036 and R1037, and the chip enable pins of U306 are KOUTEN_YK40 and KOUTEN_YK41, and the connected pull-up resistors are R1038 and R1039, and each chip enable pin is directly connected to the CPU pin. Since the CPU pins are in input state when powered on, connecting pull-up resistors can ensure that the chip is disabled and in high impedance state, thereby ensuring that the remote control does not jump randomly. During uboot initialization and kernel initialization, these pins are initialized as output pins and set to high level. Only when the application is running and the pin state is determined according to the setting, the pin is enabled (set to low level) and the remote control state is output. Data latches U299, U301, U303, and U305 have a first selection pin, which are GPMC0_CS1nA_YK1, GPMC0_CS1nA_YK2, GPMC0_CS1nA_YK3, and GPMC0_CS1nA_YK4, respectively. The programmable logic module 800 selects four groups of 16-way remote controls through the four chip selection signals GPMC0_CS1nA_YK1, GPMC0_CS1nB_YK2, GPMC0_CS1nC_YK3, and GPMC0_CS1nD_YK4 decoded by GPMC0_CS1n and A22, A21, and sends the remote control signal to the port. The high level is valid.

[0057] In some embodiments of the present invention, the telesignaling extension module 600 includes a telesignaling signal transceiver, which has multiple signal input terminals and multiple signal output terminals, each signal input terminal corresponds to each signal output terminal, each signal input terminal is used to receive a telesignaling signal, and each signal output terminal is used to send a telesignaling signal to the main control module 100; the telesignaling signal transceiver has a second selection pin, and the second selection pin is electrically connected to the programmable logic module 800. Specifically, as Figure 7 and Figure 8As shown, in this example, there are four remote signaling extension modules 600, each of which has a remote signaling signal transceiver, namely U4, U9, U298 and U297, each of which has 16 signal input terminals, namely YX1~YX16, YX17~YX32, YX33~YX48, YX49~YX64, and each of which has 16 signal output terminals, namely GPMC0_AD0_YX~GPMC0_AD15_YX; each remote signaling signal transceiver has a second selection pin, namely GPMC0_CS2nA_YX1#, GPMC0_CS2nB_YX2#, GPMC0_CS2nC_YX3#, GPMC0_CS2nD_YX4#. The four telesignaling extension modules 600 can input a total of 64 telesignaling signals, namely YX1~YX64 shown in the figure. The four chip select signals GPMC0_CS2nA_YX1#, GPMC0_CS2nB_YX2#, GPMC0_CS2nC_YX3#, GPMC0_CS2nD_YX4# decoded by GPMC0_CS2n and A22, A21 of the programmable logic module 800 are used to select four groups of telesignaling signals. Each group of telesignaling signals includes 16 telesignaling signals, and the low level is valid. The telesignaling signals are read into the CPU for processing.

[0058] In some embodiments of the present invention, the telemetry expansion module 700 includes an analog-to-digital converter, which is used to receive the telemetry signal, perform analog-to-digital conversion on the telemetry signal, and then send it to the main control module 100; the analog-to-digital converter has a third selection pin, and the third selection pin is electrically connected to the programmable logic module. Specifically, Fig. 9 and Fig.10As shown, in this example, there are four telemetry expansion modules 700, each of which has an analog-to-digital converter, namely U308, U309, U310 and U311, and each of which has 16 signal input terminals, namely AIN1+~AIN16+, AIN17+~AIN32+, AIN33+~AIN48+, AIN49+~AIN64+, and each of which has 16 signal output terminals, namely GPMC0_AD0_YC~GPMC0_AD15_YC, and each analog-to-digital converter has a third selection pin, namely GPMC0_CS0nA_YC1#, GPMC0_CS0nB_YC2#, GPMC0_CS0nC_YC3#, GPMC0_CS0nD_YC4#. The four telemetry expansion modules 700 can input a total of 64 telemetry signals, namely AIN1+~AIN64+ shown in the figure, and the four chip select signals GPMC0_CS0nA_YC1#, GPMC0_CS0nB_YC2#, GPMC0_CS0nC_YC3#, GPMC0_CS0nD_YC4# decoded by GPMC0_CS0n and A22, A21 are used to select four groups of telemetry signals. Each group of telemetry signals includes 16 telemetry signals, and the low level is valid. The telemetry signals are read into the CPU for processing.

[0059] It should be noted that this solution can also be flexibly matched in the form of boards. For example, every two expansion chips form a board, with a maximum of 8 expansion chips. Each type of board can be configured as 1-4 pieces to meet the channel requirements of different scenarios. In this way, the minimum number of channels is 32-32-32 and the maximum number of channels is 128-128-128.

[0060] The cost of this solution expansion is the cost of CPLD + data bus driver. The use of CPLD replaces various decoders and gate circuits, saving costs. CPLD can also adjust and modify the logic without modifying the schematic diagram and PCB. If the bus expansion interface is used in combination with CPLD, it can be expanded to a maximum of 128 telemetering and telecontrol channels to meet the needs of centralized DTU. When AM6442 uses a 16-bit data bus, the bus speed of GPMC is 133MHz, and AM3352 also has a bus speed of 100MHz. The maximum speed of the IIC bus is only 400KHz serial, which is far lower than the 133MHz bus speed of GPMC. The cost of FPGA is high, and it is also necessary to provide RAM for its operation, load the program at power-on, and have poor anti-interference ability, which increases the cost of software and hardware development. Therefore, bus mode + CPLD to complete logic control is currently the most cost-effective solution. In this example, A22 and A21 are used for decoding. If one more address line (such as A20) is added, the number of external chips can be doubled from 4 to 8. In more extreme cases, if another address line (such as A19) is added, there are four address lines for decoding, which can expand 16 chips externally. In addition, the three interfaces of telemetry, telesignaling and remote control can be realized, which is difficult to achieve with other expansion methods.

[0061] According to the centralized DTU of the embodiment of the present invention, by adopting the remote control bus driver module 200, the remote signal bus driver module 300 and the telemetry bus driver module 400, the driving force of the main control module 200 can be enhanced, and the main control module only needs to be connected to three bus driver chips, and then the three bus driver chips are used to connect a plurality of remote control expansion modules 500, a plurality of remote signal expansion modules 600 and a plurality of telemetry expansion modules 700, so that the bus interface can be expanded, the system burden can be reduced, and the signal routes of the system's remote signal, telemetry and remote control can be expanded, and the bus speed can be improved. The centralized DTU adopts a 16-bit data bus in conjunction with a CPLD for expansion design. If two-bit address lines A22 and A21 are used for decoding, 64-way telemetry, 64-way telesignaling and 64-way remote control can be realized; if three-bit address lines A22, A21 and A20 are used for decoding, 128-way telemetry, 128-way telesignaling and 128-way remote control can be realized. The number of interfaces can be flexibly configured by allocating the number of plug-in cards in combination with the board design.

[0062] Although specific embodiments are described herein, those of ordinary skill in the art will recognize that many other modifications or alternative embodiments are also within the scope of the present disclosure. For example, any of the functions and / or processing capabilities described in conjunction with a particular device or component may be performed by any other device or component. In addition, although various exemplary implementations and architectures have been described according to embodiments of the present disclosure, those of ordinary skill in the art will recognize that many other modifications to the exemplary implementations and architectures described herein are also within the scope of the present disclosure.

[0063] Some aspects of the present disclosure are described above with reference to the block diagram and flow chart of the system, method, system and / or computer program product according to the exemplary embodiments.It should be understood that the combination of one or more blocks in the block diagram and the flow chart and the blocks in the block diagram and the flow chart can be realized by executing computer executable program instructions respectively.Equally, according to some embodiments, some blocks in the block diagram and the flow chart may not need to be executed in the order shown, or may not need to be executed in full.In addition, additional components and / or operations beyond those components and / or operations shown in the blocks in the block diagram and the flow chart may be present in certain embodiments.

[0064] Therefore, the blocks in the block diagrams and flow charts support the combination of devices for performing the specified functions, the combination of elements or steps for performing the specified functions, and the program instruction devices for performing the specified functions. It should also be understood that each block in the block diagrams and flow charts and the combination of blocks in the block diagrams and flow charts can be implemented by a special-purpose hardware computer system or a combination of special-purpose hardware and computer instructions that performs a specific function, element or step.

[0065] The program modules, applications, etc. described herein may include one or more software components, including, for example, software objects, methods, data structures, etc. Each such software component may include computer-executable instructions that, in response to execution, cause at least a portion of the functionality described herein (e.g., one or more operations of the illustrative methods described herein) to be performed.

[0066] Software components can be encoded with any of various programming languages. An exemplary programming language can be a low-level programming language, such as an assembly language associated with a specific hardware architecture and / or an operating system platform. The software component comprising assembly language instructions may need to be converted to executable machine code by an assembler before being executed by hardware architecture and / or platform. Another exemplary programming language can be a higher-level programming language, which can be transplanted across multiple architectures. The software component comprising a higher-level programming language may need to be converted to an intermediate representation by an interpreter or a compiler before execution. Other examples of programming languages ​​include but are not limited to macro languages, shells or command languages, job control languages, scripting languages, database queries or search languages ​​or report writing languages. In one or more exemplary embodiments, the software component comprising the instruction of one of the above-mentioned programming language examples can be directly executed by an operating system or other software components, without first being converted into another form.

[0067] Software components may be stored as files or other data storage structures. Software components of similar type or related functions may be stored together, such as in a specific directory, folder, or library. Software components may be static (e.g., preset or fixed) or dynamic (e.g., created or modified at execution time).

[0068] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A centralized DTU, characterized in that: include: Main control module; A remote control bus driving module, electrically connected to the main control module; A remote signal bus drive module, electrically connected to the main control module; A telemetry bus driving module, electrically connected to the main control module; A plurality of remote control expansion modules, each of which is electrically connected to the remote control bus driving module and is used to output a remote control signal; A plurality of remote signaling extension modules, each of which is electrically connected to the remote signaling bus driving module and is used for receiving remote signaling signals; A plurality of telemetry expansion modules, each of which is electrically connected to the telemetry bus driving module and is used to receive telemetry signals; A programmable logic module is electrically connected to the main control module, the remote control bus driving module, the remote signaling bus driving module, the telemetry bus driving module, a plurality of the remote control extension modules, a plurality of the remote signaling extension modules and a plurality of the telemetry extension modules respectively; The remote control expansion module includes a data latch and a dual-power bus transceiver, the data latch is electrically connected to the remote control bus driver module and the programmable logic module respectively, the dual-power bus transceiver is electrically connected to the data latch, and the dual-power bus transceiver is used to output the remote control signal; The dual power bus transceiver has a chip enable pin, which is electrically connected to the main control module and connected to a pull-up resistor; the data latch has a first selection pin, which is electrically connected to the programmable logic module.

2. The centralized DTU according to claim 1, characterized in that: The main control module uses at least two address lines for decoding.

3. The centralized DTU according to claim 1, characterized in that: The programmable logic module selects a plurality of the remote control expansion modules, a plurality of the remote signaling expansion modules and a plurality of the remote measurement expansion modules according to the selection signal.

4. The centralized DTU according to claim 1, characterized in that: The remote signaling expansion module includes a remote signaling signal transceiver, which has multiple signal input terminals and multiple signal output terminals, each of the signal input terminals corresponds to each of the signal output terminals one by one, each of the signal input terminals is used to receive a remote signaling signal, and each of the signal output terminals is used to send the remote signaling signal to the main control module; the remote signaling signal transceiver has a second selection pin, and the second selection pin is electrically connected to the programmable logic module.

5. The centralized DTU according to claim 1, characterized in that: The telemetry expansion module includes an analog-to-digital converter, which is used to receive a telemetry signal, perform analog-to-digital conversion on the telemetry signal, and then send it to the main control module; the analog-to-digital converter has a third enable pin, and the third enable pin is electrically connected to the programmable logic module.

6. The centralized DTU according to claim 1, characterized in that: Each of the remote control expansion modules can output at least 16 remote control signals, each of the remote signaling expansion modules can receive at least 16 remote signaling signals, and each of the remote measurement expansion modules can receive at least 16 remote measurement signals.

7. The centralized DTU according to claim 1, characterized in that: The main control module includes a CPU of model AM6442.

8. The centralized DTU according to claim 1, characterized in that: The programmable logic module includes CPLD.

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