CN115776421A - Electromagnetic isolation circuit and method of high-speed network bus - Google Patents
Electromagnetic isolation circuit and method of high-speed network bus Download PDFInfo
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Abstract
The invention belongs to the technical field of network communication, and particularly relates to an electromagnetic isolation circuit of a high-speed network bus, which comprises: bus interface circuit, network bus, network node; the network bus adopts a high-speed differential twisted pair bus to transmit signals so as to realize a high-speed and high-reliability bus network; the bus interface circuit is connected with a high-speed differential twisted pair bus, and an interface isolation circuit is arranged between the high-speed differential twisted pair bus and the network node. Compared with the prior art, in order to solve the isolation method based on the high-speed bus, the invention provides the isolation communication method of the high-speed network, which realizes high-speed data transmission through two groups of twisted pairs and reduces interference and bit error rate. The invention carries out bus isolation data communication by bus sending-isolating-receiving or sending-isolating-receiving modes. The bus isolation communication solves the problem of influence on the bus when BN on the bus fails. The bus communication is ensured to be normal and data is received and transmitted.
Description
Technical Field
The invention belongs to the technical field of network communication, and particularly relates to an electromagnetic isolation circuit and method of a high-speed network bus.
Background
In a bus communication network, all nodes share a transmission channel, and information transmitted from one node can be received by a plurality of nodes on the network.
Signals of traditional buses such as RS485, RS422, ETH, CAN and the like CAN be networked, but the communication distance and the speed of the conventional network networking cannot be obtained at the same time, the transmission distance of the ETH is limited when no exchanger or repeater exists, and data transmission cannot be carried out in a bus-like mode when no exchange equipment exists.
Signals of traditional field buses such as RS485, RS422, CAN and the like CAN be networked in a bus form, but large data volume transmission cannot be carried out due to the limitation of a physical layer and a protocol layer.
When the bus type network is implemented, the bus type network needs to be interconnected in an isolation mode so as to solve the problem that the bus normally works when the bus single-node network is damaged.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide an electromagnetic isolation method of a high-speed network bus.
(II) technical scheme
In order to solve the above technical problem, the present invention provides an electromagnetic isolation circuit for a high-speed network bus, the electromagnetic isolation circuit comprising: a bus interface circuit, a network bus, a network node;
the network bus adopts a high-speed differential twisted pair bus to transmit signals so as to realize a high-speed and high-reliability bus network;
the bus interface circuit is connected with a high-speed differential twisted pair bus, and an interface isolation circuit is arranged between the high-speed differential twisted pair bus and the network node.
The interface isolation circuit adopts a transformer to realize physical isolation.
Two groups of high-speed differential twisted-pair buses are arranged to form redundancy protection;
and the two groups of high-speed differential twisted-pair buses are connected with each network node through interface isolation circuits.
In addition, the invention also provides an electromagnetic isolation method of the high-speed network bus, which is implemented based on the electromagnetic isolation circuit;
in the method, bus differential signals of each network node transceiver are isolated by a transformer and then are interacted to a high-speed differential twisted pair bus.
Physical isolation realized by a transformer is arranged on both sides of the high-speed differential twisted pair bus, and bus differential signals transmitted to the high-speed differential twisted pair bus by the network node transceiver are coupled and filtered through a differential mode coupled coil to enhance the signals.
Wherein, the bus differential signal received by the network bus is coupled to another network node transceiver with different level through the conversion of the electromagnetic field of the transformer.
For a certain network node transceiver, externally output signals are transmitted to the network node transceiver through physical isolation; in the process, after signals are isolated, the common-mode signal characteristic is suppressed by using a transformer, so that the signals are input into the network node transceiver after common-mode interference is suppressed.
The plurality of interface isolation circuits are connected to network nodes with different levels through a network bus so as to prevent different voltages from transmitting through the network bus to damage the network nodes.
The network bus realizes signal enhancement through isolation transmission, so that a remote node of the network bus receives signals through an interface isolation circuit; after a certain network node fails, the network bus can still communicate normally.
Wherein the method supports bus communication at different rates.
(III) advantageous effects
Compared with the prior art, in order to solve the isolation method based on the high-speed bus, the invention provides the isolation communication method of the high-speed network, which realizes high-speed data transmission through two groups of twisted pairs and reduces interference and bit error rate.
The invention carries out bus isolation data communication by bus sending-isolating-receiving or sending-isolating-receiving modes. The bus isolation communication solves the problem of influence on the bus when BN on the bus fails. The bus communication is ensured to be normal and data is received and transmitted.
Drawings
FIG. 1 shows a conventional low speed bus connection schematic.
Fig. 2 and 4 are schematic diagrams of bus structures according to the present invention.
Figure 3 shows an isolation module layout of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the above technical problem, the present invention provides an electromagnetic isolation circuit for a high-speed network bus, including: bus interface circuit, network bus, network node;
the network bus adopts a high-speed differential twisted pair bus to transmit signals so as to realize a high-speed and high-reliability bus network;
the bus interface circuit is connected with a high-speed differential twisted pair bus, and an interface isolation circuit is arranged between the high-speed differential twisted pair bus and the network node.
The interface isolation circuit adopts a transformer to realize physical isolation.
Two groups of high-speed differential twisted-pair buses are arranged to form redundancy protection;
and the two groups of high-speed differential twisted-pair buses are connected with each network node through interface isolation circuits.
In addition, the invention also provides an electromagnetic isolation method of the high-speed network bus, which is implemented based on the electromagnetic isolation circuit;
in the method, bus differential signals of each network node transceiver are isolated by a transformer and then are interacted to a high-speed differential twisted pair bus.
The two sides of the high-speed differential twisted pair bus are provided with physical isolation realized by a transformer, and bus differential signals transmitted to the high-speed differential twisted pair bus by the network node transceiver are coupled and filtered through a differential mode coupling coil to enhance the signals.
Wherein, the bus differential signal received by the network bus is coupled to another network node transceiver with different level through the conversion of the electromagnetic field of the transformer.
For a certain network node transceiver, externally output signals are transmitted to the network node transceiver through physical isolation; in the process, after signals are isolated, the common-mode signal characteristic is suppressed by using a transformer, so that the signals are input into the network node transceiver after common-mode interference is suppressed.
The plurality of interface isolation circuits are connected to network nodes with different levels through a network bus so as to prevent different voltages from transmitting through the network bus to damage the network nodes.
The network bus realizes signal enhancement through isolation transmission, so that a remote node of the network bus receives signals through an interface isolation circuit; after a certain network node fails, the network bus can still communicate normally.
Wherein the method supports bus communication at different rates.
Example 1
The electromagnetic isolation method of the high-speed network bus of the present embodiment is provided with a bus transceiver circuit and an interface isolation circuit. It has the following characteristics:
(1) Supporting high bus rates.
(2) The bus interface signal is output and then sent out through the isolation circuit, and the node is directly received through the isolation circuit or from the secondary side of the isolation circuit.
(3) Each node device on the bus is electrically isolated by a transformer and then carries out bus communication.
(4) Long-distance signal transmission is supported.
(5) A single node failure will not affect the rest of the bus and the bus itself communication.
(6) The network bus is a differential long-distance transmission or short-distance transmission bus.
(7) Bus communication of different rates is supported.
Example 2
The embodiment provides a high-speed bus electromagnetic isolation method, which is characterized by comprising the following steps:
the two sides of the bus are physically isolated, and differential signals sent to the bus by the transceiver are filtered by the coupling of coils in differential mode coupling so as to enhance the signals.
Coupled to the connecting device of different levels at the other end through the conversion of the electromagnetic field.
External output signals are sent into equipment through isolation, and after isolation, the signals utilize a transformer device to inhibit common-mode signal characteristics and inhibit common-mode interference input nodes.
Different levels between different network devices connected by the bus are isolated to prevent different voltages from transmitting across the bus to damage the nodes.
The bus is transmitted by the isolator to enhance the signal, so that the remote node of the bus receives the signal by the isolator.
The node fault bus will communicate normally.
Example 3
Fig. 2, fig. 3 and fig. 4 are schematic diagrams of a bus structure and an isolation module according to the present invention.
This architecture designs an isolated high-speed bus architecture relative to conventional bus architectures. The high-speed and high-reliability bus network is realized through twisted pair transmission, and the normal communication of each BN of the communication network is ensured through the isolation module.
Two sets of twisted-pair lines respectively correspond to the two channels of receiving and transmitting, can stably communicate, and have better anti-jamming capability and longer transmission distance when high-speed data transmission is carried out compared with a single transmission line network used for both receiving and transmitting. The bus transmission data volume is greatly reduced when the field bus such as CAN transmits in long distance.
In actual work of the bus, communication faults of bus nodes or bus paralysis and the like often occur due to long-distance transmission or use environment influence and the like, and because long-distance transmission causes two ends of a transmission line to be too far, the reference ground potential difference of the two ends is too large, and signal reference points of the two ends are inconsistent, so that the communication faults of the bus network even damage a node interface chip. Therefore, when two twisted pairs perform full-duplex high-speed data transmission, the invention adds a transformer for isolation at the same time, as shown in fig. 3. And the transmission line at the transceiver end carries out capacitance C isolation, and the common-mode voltage of the bus is filtered and adjusted through the capacitance, so that the effect of differential-mode voltage is amplified. The design can increase the stability of the circuit, and meanwhile, each transceiver on the bus cannot be damaged due to the overhigh common-mode voltage. The bus isolates the coupling signal through the transformer, increases the anti-interference performance of the signal, simultaneously can also make the bus compatibility stronger, and each node equipment of the bus can not influence communication or even damage equipment because of the problems of common mode voltage mismatching or too large common mode voltage difference of the long cable and the like.
Referring to fig. 2, the present invention designs a high-speed bus isolation method, which communicates between nodes on a bus through a PHY-transceiver-transformer-transceiver-PHY structure.
Those skilled in the art will appreciate that embodiments of the present invention may be provided as a method, system, or corresponding hardware product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An electromagnetic isolation circuit for a high-speed network bus, the electromagnetic isolation circuit comprising: bus interface circuit, network bus, network node;
the network bus adopts a high-speed differential twisted pair bus to transmit signals so as to realize a high-speed and high-reliability bus network;
the bus interface circuit is connected with a high-speed differential twisted pair bus, and an interface isolation circuit is arranged between the high-speed differential twisted pair bus and the network node.
2. The electromagnetic isolation circuit for a high-speed network bus of claim 1, wherein the interface isolation circuit employs a transformer to achieve physical isolation.
3. The electromagnetic isolation circuit of a high-speed network bus of claim 1, wherein there are two sets of the high-speed differential twisted pair bus to form redundancy protection;
the two groups of high-speed differential twisted-pair buses are connected with each network node through interface isolation circuits.
4. An electromagnetic isolation method of a high-speed network bus, characterized in that the electromagnetic isolation method is implemented based on the electromagnetic isolation circuit of claim 2;
in the method, bus differential signals of each network node transceiver are isolated by a transformer and then are interacted to a high-speed differential twisted pair bus.
5. The method for electromagnetic isolation of a high-speed network bus according to claim 4, wherein the physical isolation implemented by the transformer is disposed on both sides of the high-speed differential twisted pair bus, and the bus differential signals sent from the network node transceiver to the high-speed differential twisted pair bus are coupled and filtered by the differential-mode coupled coils to enhance the signals.
6. A method of electromagnetic isolation for a high speed network bus as recited in claim 5, wherein said bus differential signal received by said network bus is coupled to another network node transceiver of a different level through a transformation of a transformer electromagnetic field.
7. A method for electromagnetic isolation of a high-speed network bus as claimed in claim 6, wherein for a certain network node transceiver, the externally outputted signal is sent to the local network node transceiver through physical isolation; in the process, after signals are isolated, the common-mode signal characteristic is suppressed by using a transformer, so that the signals are input into the network node transceiver after common-mode interference is suppressed.
8. A method for electromagnetic isolation of a high speed network bus as recited in claim 7, wherein the plurality of interface isolation circuits are connected to network nodes of different levels through the network bus to prevent different voltages from being transmitted through the network bus to damage the network nodes.
9. The electromagnetic isolation method of a high-speed network bus of claim 8, wherein the network bus implements enhanced signals by isolated transmission, such that the remote node of the network bus receives signals through the interface isolation circuit; after a certain network node fails, the network bus can still communicate normally.
10. A method of electromagnetic isolation for a high speed network bus as recited in claim 9, wherein said method supports bus communications at different rates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211364871.2A CN115776421A (en) | 2022-11-02 | 2022-11-02 | Electromagnetic isolation circuit and method of high-speed network bus |
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| CN202211364871.2A CN115776421A (en) | 2022-11-02 | 2022-11-02 | Electromagnetic isolation circuit and method of high-speed network bus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117033294A (en) * | 2023-10-10 | 2023-11-10 | 北京国科天迅科技股份有限公司 | High-speed serial data transmission device |
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