Safety maintenance system based on dual-mode communication

Abstract

This utility model discloses a security maintenance system based on dual-mode communication. The security maintenance system includes a network master node and several network slave nodes. The network master node includes a concentrator local communication unit, which includes a three-phase combined carrier communication circuit and a master low-power wireless communication circuit. The network slave nodes include a collector dual-mode communication unit, which includes a three-phase independent carrier communication circuit and a slave low-power wireless communication circuit. The concentrator local communication unit is connected to the three-phase power line through the three-phase combined carrier communication circuit and the master low-power wireless communication circuit. The collector dual-mode communication unit is also connected to the three-phase power line through the three-phase independent carrier communication circuit and the slave low-power wireless communication circuit. This utility model integrates power line carrier communication and low-power wireless dual-mode communication functions, solving the problem of secure transmission of communication data.

Description

Technical Field

[0001] The utility model relates to the technical field of dual-mode communication, in particular to a safety maintenance system based on dual-mode communication. Background Art

[0002] In scenarios where data collection and detection are concentrated, such as electricity meter reading, dual-mode communication networks that combine power line carrier communication with micro-power wireless communication are widely used. Dual-mode communication uses micro-power wireless communication, which can effectively deal with scenarios where power line carrier communication is interfered with and cannot be effectively transmitted. Data is transmitted in space. Due to the fixed protocol, it is easy to imitate the sending format to forge and tamper with the data, or to be parsed by malicious parties who understand the protocol through the receiving format specified by the protocol. At the same time, the dual-mode communication network uses micro-power wireless communication based on space wireless transmission and has higher requirements for data security. Summary of the invention

[0003] (I) Purpose of the utility model

[0004] The purpose of the utility model is to propose a security maintenance solution based on dual-mode communication in response to the current data security issues during dual-mode communication network transmission and the requirements of dual-mode communication network for data security transmission, encrypt communication as required to ensure communication security.

[0005] (II) Technical solution

[0006] To solve the above problems, the first aspect of the utility model provides a security maintenance system based on dual-mode communication, the security maintenance system comprising a network master node and several network slave nodes; the network master node comprises a concentrator local communication unit, the concentrator local communication unit comprises a three-phase combined carrier communication circuit and a master micro-power wireless communication circuit; the network slave node comprises a collector dual-mode communication unit, the collector dual-mode communication unit comprises a three-phase independent carrier communication circuit and a slave micro-power wireless communication circuit; the concentrator local communication unit is connected to the three-phase power line through the three-phase combined carrier communication circuit and the master micro-power wireless communication circuit; the collector dual-mode communication unit is connected to the three-phase power line through the three-phase independent carrier communication circuit and the slave micro-power wireless communication circuit.

[0007] Preferably, in the security maintenance system, the concentrator local communication unit also includes a concentrator local communication unit main control module, a storage module, a 4G module and a concentrator access interface.

[0008] Preferably, in the security maintenance system, the collector dual-mode communication unit further includes a collector local communication unit main control module, a Bluetooth module and a collector access interface.

[0009] Preferably, in the security maintenance system, the concentrator local communication unit and several collector local communication units form a dual-mode communication network, and the dual-mode communication network includes one concentrator local communication unit and several collector local communication units, the concentrator local communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line, and each collector dual-mode communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line.

[0010] Preferably, in the safety maintenance system, the three-phase combined carrier communication circuit includes three zero-crossing detection chips, three optocoupler chips, a carrier circuit driver chip and three coupling transformers; the zero-crossing detection chip is respectively connected to the optocoupler chips, the three optocoupler chips are connected to the carrier circuit driver chip, and the carrier circuit driver chip is respectively connected to the three coupling transformers; the concentrator local communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line through three coupling transformers; the three coupling transformers are respectively connected to the carrier circuit driver chip, and the carrier signal output by the carrier circuit driver chip is coupled to the three-phase power line.

[0011] Preferably, in the safety maintenance system, the three-phase independent carrier communication circuit includes three zero-crossing detection chips, three optocoupler chips, a coupling transformer and a carrier circuit driver chip; each of the collector local communication units is connected to the A phase, B phase or C phase of the three-phase power line through a coupling transformer; the coupling transformer is connected to the carrier circuit driver chip to couple the carrier signal output by the carrier circuit driver chip to the corresponding phase of the three-phase power line.

[0012] Preferably, in the security maintenance system, the main control module of the local communication unit of the concentrator includes a first HPLC dual-mode chip, which is a ZXYL01 chip; the main control module of the local communication unit of the concentrator includes a second HPLC dual-mode chip, which is a ZXYL02 chip.

[0013] Preferably, in the security maintenance system, the concentrator access interface of the concentrator local communication unit is a four-wire RS485 serial communication standard interface; the collector access interface of the collector dual-mode communication unit is a four-wire RS485 serial communication standard interface.

[0014] Preferably, in the security maintenance system, the concentrator access interface is connected to the concentrator local communication unit, and the collector access interface is connected to the collector dual-mode communication unit.

[0015] Preferably, in the security maintenance system, the main micro-power wireless communication circuit in the concentrator local communication unit is connected to the 4G module.

[0016] (III) Beneficial effects

[0017] The above technical solution of the utility model has the following beneficial technical effects:

[0018] The utility model proposes a security maintenance system based on dual-mode communication. Based on the security issues existing in current communication transmission, the utility model integrates power line carrier communication and micro-power wireless dual-mode communication control functions, and solves the problem that during the data communication process of the dual-mode communication network, the information sent to the local communication unit of the concentrator as a network node or the dual-mode communication unit of the collector as a network slave node is cracked due to the communication not being encrypted or the communication format standard of the protocol used being tampered with. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a safety maintenance system based on dual-mode communication according to an implementation mode of the utility model;

[0020] Figure 2 It is a networking process diagram of a dual-mode communication-based security maintenance system according to an implementation mode of the present utility model;

[0021] Figure 3 This is a diagram of the key update process after the security maintenance system based on dual-mode communication is successfully networked in the implementation mode of the utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0023] The drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clarity. The shapes of various regions and layers shown in the drawings and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0024] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Figure 1 This is a schematic diagram of the structure of the dual-mode communication-based security maintenance system of the utility model. Figure 1 Describe the structure of a security maintenance system based on dual-mode communication.

[0027] The security maintenance system includes a network master node and several network slave nodes. The network master node includes a concentrator local communication unit, which includes a three-phase combined carrier communication circuit 1 and a master micro-power wireless communication circuit 2. The network slave node includes a collector dual-mode communication unit, which includes a three-phase independent carrier communication circuit 7 and a slave micro-power wireless communication circuit 8.

[0028] In one embodiment, the network slave node may also be used to forward the communication signal to another network slave node to prevent the power line carrier communication and the micro-power wireless communication from being physically too far away and causing signal distortion.

[0029] The local communication unit of the concentrator is connected to the three-phase power line through the three-phase combined carrier communication circuit 1 and the main micro-power wireless communication circuit 2. The dual-mode communication unit of the collector is connected to the three-phase power line through the three-phase independent carrier communication circuit 7 and the slave micro-power wireless communication circuit 8.

[0030] In one embodiment, the three-phase independent carrier communication circuit 7 of the local communication unit of the concentrator and the main micro-power wireless communication circuit 2 adopt high-speed power line carrier and micro-power wireless dual-mode communication methods, and are connected with the three-phase independent carrier communication circuit 7 and the slave micro-power wireless communication circuit 8 of the dual-mode communication unit of the collector for dual-mode communication. Among them, the carrier communication circuit needs to be connected with the three-phase power line as the intermediate medium, and the micro-power wireless communication circuit is connected with the electromagnetic wave propagation space as the intermediate medium.

[0031] In addition, the concentrator local communication unit also includes a concentrator local communication unit main control module 3, a storage module 4, a 4G module 5 and a concentrator access interface 6. The collector dual-mode communication unit also includes a collector local communication unit main control module 9, a Bluetooth module 11 and a collector access interface 10.

[0032] In one embodiment, the storage module 4 of the local communication unit of the concentrator includes a W25Q16JVSSIQ chip, which is a non-volatile memory NOR Flash. The Bluetooth module 11 is used for on-site wireless communication debugging.

[0033] Specifically, the concentrator access interface 6 of the concentrator local communication unit is a four-wire RS485 serial communication standard interface; the collector access interface 10 of the collector dual-mode communication unit is a four-wire RS485 serial communication standard interface. The concentrator access interface is connected to the concentrator local communication unit for data exchange, and the collector access interface is connected to the collector dual-mode communication unit for data exchange.

[0034] Specifically, the three-phase combined carrier communication circuit 1 includes three zero-crossing detection chips, three optical coupling chips, a carrier circuit driving chip and three coupling transformers. The zero-crossing detection chips are respectively connected to the optical coupling chips, the three optical coupling chips are connected to the carrier circuit driving chip, and the carrier circuit driving chip is respectively connected to the three coupling transformers.

[0035] In one embodiment, the zero-crossing detection chip is mainly used to detect the AC voltage signal crossing the zero level point. When the zero-crossing detection chip detects that the AC voltage crosses the zero point, an optical signal is emitted. The zero-crossing detection chip is connected to an optocoupler chip, and the optocoupler chip is used to convert the electrical signal of the zero-crossing detection chip into an optical signal, and isolate the AC circuit of the zero-crossing detection chip. The isolation effect of the optocoupler chip enables the circuit where the carrier circuit driver chip is located to receive the signal coming from the zero-crossing point, and is not affected by the AC circuit. The optocoupler chip is connected to the carrier circuit driver chip, and the carrier circuit driver chip receives the signal emitted by the zero-crossing detection chip when it detects the zero-crossing point. The carrier circuit driver chip is respectively connected to a coupling transformer, and the coupling transformer couples the carrier signal emitted by the carrier circuit driver chip to a certain phase power line.

[0036] The local communication unit of the concentrator is connected to the A phase, B phase and C phase of the three-phase power line through three coupling transformers. Specifically, the three coupling transformers are respectively connected to the carrier circuit driving chip to couple the carrier signal output by the carrier circuit driving chip to the three-phase power line.

[0037] In one embodiment, the three-phase combined carrier communication circuit 1 includes three zero-crossing detection chips gs1102, three optocoupler chips, a carrier circuit driver chip SP5055 and three coupling transformers PE-68046. The three zero-crossing detection chips gs1102 are used to detect whether the voltage is zero-crossing, and if the voltage is zero-crossing, a zero-crossing detection signal is sent. The three optocoupler chips are used to convert electrical signals into optical signals to protect the circuit. A carrier circuit driver chip SP5055 is used to modulate the carrier signal. The three coupling transformers PE-68046 are respectively connected to the carrier circuit driver chip SP5055, and are used to couple the carrier signal output by the carrier circuit driver chip to the three-phase power line.

[0038] The three-phase independent carrier communication circuit 7 includes three zero-crossing detection chips, three optical coupling chips, a coupling transformer and a carrier circuit driver chip. Each collector local communication unit is connected to the A phase, B phase or C phase of the three-phase power line through a coupling transformer. Specifically, the coupling transformer is connected to the carrier circuit driver chip to couple the carrier signal output by the carrier circuit driver chip to the corresponding phase of the three-phase power line.

[0039] In one embodiment, the three-phase combined carrier communication circuit as the power line carrier communication circuit of the concentrator needs to couple the carrier signal to the three phases A, B, and C through three coupling transformers to transmit and receive the power line signals of each phase. The three-phase independent carrier communication circuit has only one coupling transformer, but by using multiple optical coupling chips and zero-crossing detection chips, the three-phase independent carrier communication circuit can still achieve independent communication of each phase, and has lower cost and complexity.

[0040] In one embodiment, the three-phase independent carrier communication circuit 7 includes three zero-crossing detection chips GS1102, three optical coupling chips, and a coupling transformer PE-68046. Each collector local communication unit is connected to the A phase, B phase or C phase of the three-phase power line through a coupling transformer, and only one carrier communication is selected to couple the local communication unit carrier signal to a certain phase power line.

[0041] Specifically, the local communication unit main control module 3 of the concentrator includes a first HPLC dual-mode chip, which is a ZXYL01 chip. The local communication unit main control module 9 of the collector includes a second HPLC dual-mode chip, which is a ZXYL02 chip.

[0042] In one embodiment, the main control module 3 of the local communication unit of the concentrator includes a first HPLC dual-mode chip, which is a ZXYL01 chip, and is a main control unit for integrating power line carrier communication and micro-power wireless dual-mode communication control functions. A 698 protocol stack is set in the chip to standardize the data transmission standard. The chip adopts an asymmetric encryption algorithm P-RSA to build a channel for secure transmission and regular update of chacha20 keys, and occupies a small amount of computing and storage resources and a high degree of security. The symmetric encryption algorithm chacha20 is customized to encrypt application layer data to ensure data security. The main control module 9 of the local communication unit of the collector includes a second HPLC dual-mode chip, which is a ZXYL02 chip. The ZXYL02 chip cooperates with the main control of the local communication unit of the concentrator to build a dual-mode communication network.

[0043] Specifically, the main micro-power wireless communication circuit 2 in the local communication unit of the concentrator is connected to the 4G module 5. In one embodiment, the main micro-power wireless communication circuit 2 is connected to the 4G module 5, and the main micro-power wireless communication circuit 2 includes a radio frequency circuit and an antenna, which is connected to the 4G module to control the local communication unit of the concentrator for controlling remote wireless communication.

[0044] In addition, the concentrator local communication unit and several collector local communication units form a dual-mode communication network, which includes a concentrator local communication unit and several collector local communication units. The concentrator local communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line, and each collector dual-mode communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line.

[0045] In one embodiment, the dual-mode communication network includes a concentrator local communication unit and several collector local communication units. The concentrator local communication unit is a network master node, which is used for network control, network maintenance and data management and control. Specifically, network control includes network broadcast, whitelist verification and network access negotiation. Network maintenance includes periodic heartbeat detection, encrypted heartbeat detection and random password change. Data management and control include command encryption, packaged frames and dual-mode transmission. The collector local communication unit is a network slave node, which is used for collector data management, information forwarding and cooperation with the network master node. The utility model adopts the chacha20 algorithm to sign or encrypt the specified information during system operation, which can effectively solve the problem of wireless communication information security in dual-mode communication.

[0046] Figure 2 This is a networking process diagram of a dual-mode communication-based security maintenance system according to an embodiment of the present invention. Figure 2 The present invention describes the process of networking between the local communication unit of the concentrator and several dual-mode communication units of multi-stage collectors.

[0047] First, according to the 698 protocol built into the main control module 3 of the local communication unit of the concentrator, the local communication unit of the concentrator sends a networking message through the carrier power line or wireless broadcast according to the 698 protocol message frame format. The networking information carries the asymmetric encryption algorithm P-RSA public key stored in the memory 4 of the local communication unit of the concentrator.

[0048] The dual-mode communication unit of the collector connected to the carrier power line or wireless broadcast receives the networking message. If the dual-mode communication unit of the collector is not connected to the network, the dual-mode communication unit of the collector will send a network access request frame to the local communication unit of the concentrator. The network access request frame follows the 698 protocol network access request frame format, and its application layer data carries the encryption requirement form, device identification number and 32-byte random number stored in the storage space of the dual-mode communication unit of the collector. The network access request frame uses the P-RSA algorithm to encrypt based on the P-RSA public key of the local communication unit of the concentrator, and is packaged into a 698 frame format for transmission.

[0049] After receiving the network access request frame, the local communication unit of the concentrator decrypts the frame according to the 698 protocol and uses the P-RSA algorithm to decrypt it based on its P-RSA private key.

[0050] The local communication unit of the concentrator compares the obtained device identification number with the white list of network access configured by the remote staff through WIFI communication before installing the entire network, and determines whether the device identification number exists in the white list.

[0051] If the device identification number does not exist, the concentrator local communication unit will discard the message.

[0052] Otherwise, the local communication unit of the concentrator allows the corresponding device to access the network, writes the random number into the random key group, updates the encryption requirement group, and returns an encrypted confirmation frame. The application layer data of the encrypted confirmation frame is the ciphertext encrypted using the obtained 32-byte random number as the chacha20 key, and the encryption object is the standard 698 protocol network access confirmation frame.

[0053] After receiving the 698 protocol encrypted confirmation frame information, the collector dual-mode communication unit decrypts the encrypted confirmation frame to obtain the application layer ciphertext, decrypts it with the corresponding 32-byte random number based on the chacha20 symmetric encryption algorithm, obtains the application layer data plaintext, and compares each application layer data item to see if it complies with the format standard specified in the 698 protocol.

[0054] If the plaintext data complies with the protocol, the collector's dual-mode communication unit is confirmed to be connected to the network and the corresponding 32-byte random key is stored.

[0055] If the plaintext data does not conform to the protocol, the collector dual-mode communication unit resends the network access request frame or waits for broadcast information and re-requests network access.

[0056] Figure 3 This is a diagram of the key update process after the security maintenance system based on dual-mode communication is successfully networked in the implementation mode of the utility model. Figure 3 The present invention describes the updating process of the random key after the local communication unit of the concentrator and the dual-mode communication unit of the collector are successfully networked.

[0057] After the collector dual-mode communication unit successfully joins the network, the concentrator local communication unit periodically sends a key update request frame to the collector dual-mode communication unit. The key update request frame is sent using chacha20 encrypted application layer data.

[0058] After the collector dual-mode communication unit decrypts the key update request frame, it generates a new 32-byte random key and encrypts it with the unique device identification number. The P-RSA algorithm is encrypted with the P-RSA algorithm public key of the concentrator dual-mode communication unit and sent to the concentrator local communication unit to complete the regular update of the random key.

[0059] The local communication unit of the concentrator returns a confirmation frame, and encrypts the communication based on the 32-byte random key and chacha20 encryption algorithm known to both parties, in accordance with the data objects and operation methods that need to be encrypted as specified in the encryption requirement sheet known to both parties, and in accordance with the 698 protocol encryption frame format.

[0060] The utility model relates to a safety maintenance system based on dual-mode communication. Based on power line carrier communication and micro-power wireless dual-mode communication control functions, it has a built-in 698 protocol stack standard data transmission standard, occupies the symmetric encryption algorithm chacha20, ensures the security of application layer data, and solves the problem of secure transmission of communication data.

[0061] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A security maintenance system based on dual-mode communication, characterized in that: The safety maintenance system includes a network master node and a plurality of network slave nodes; The network master node includes a concentrator local communication unit, and the concentrator local communication unit includes a three-phase combined carrier communication circuit and a main micro-power wireless communication circuit; The network slave node includes a collector dual-mode communication unit, and the collector dual-mode communication unit includes a three-phase independent carrier communication circuit and a slave micro-power wireless communication circuit; The concentrator local communication unit is connected to the three-phase power line through the three-phase combined carrier communication circuit and the main micro-power wireless communication circuit; The collector dual-mode communication unit is connected to the three-phase power line through the three-phase independent carrier communication circuit and the slave micro-power wireless communication circuit.

2. The safety maintenance system according to claim 1, characterized in that: The concentrator local communication unit also includes a concentrator local communication unit main control module, a storage module, a 4G module and a concentrator access interface.

3. The safety maintenance system according to claim 2, characterized in that: The collector dual-mode communication unit also includes a collector local communication unit main control module, a Bluetooth module and a collector access interface.

4. The safety maintenance system according to claim 1, characterized in that: The concentrator local communication unit and several collector local communication units form a dual-mode communication network, and the dual-mode communication network includes a concentrator local communication unit and several collector local communication units. The concentrator local communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line, and each collector dual-mode communication unit is respectively connected to the A phase, B phase and C phase of the three-phase power line.

5. The safety maintenance system according to claim 4, characterized in that: The three-phase combined carrier communication circuit includes three zero-crossing detection chips, three optical coupling chips, a carrier circuit driving chip and three coupling transformers; the zero-crossing detection chip is connected to the optical coupling chip, the three optical coupling chips are connected to the carrier circuit driving chip, and the carrier circuit driving chip is connected to the three coupling transformers, respectively; The concentrator local communication unit is respectively connected to phase A, phase B and phase C of the three-phase power line through three coupling transformers; The three coupling transformers are respectively connected to the carrier circuit driving chip to couple the carrier signal output by the carrier circuit driving chip to the three-phase power line.

6. The safety maintenance system according to claim 4, characterized in that: The three-phase independent carrier communication circuit includes three zero-crossing detection chips, three optical coupling chips, a coupling transformer and a carrier circuit driving chip; Each of the collector local communication units is connected to phase A, phase B or phase C of the three-phase power line through a coupling transformer; The coupling transformer is connected to the carrier circuit driving chip to couple the carrier signal output by the carrier circuit driving chip to the corresponding phase of the three-phase power line.

7. The safety maintenance system according to claim 3, characterized in that: The concentrator local communication unit main control module includes a first HPLC dual-mode chip, and the first HPLC dual-mode chip is a ZXYL01 chip; The main control module of the collector local communication unit includes a second HPLC dual-mode chip, and the second HPLC dual-mode chip is a ZXYL02 chip.

8. The safety maintenance system according to claim 7, characterized in that: The concentrator access interface of the concentrator local communication unit is a four-wire RS485 serial communication standard interface; The collector access interface of the collector dual-mode communication unit is a four-wire RS485 serial communication standard interface.

9. The safety maintenance system according to claim 8, characterized in that: The concentrator access interface is connected to the concentrator local communication unit, and the collector access interface is connected to the collector dual-mode communication unit.

10. The safety maintenance system according to claim 2, characterized in that: The main micro-power wireless communication circuit in the concentrator local communication unit is connected to the 4G module.

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