CN110554247A - crosstalk simulation modeling method and simulation model of non-parallel cable - Google Patents
crosstalk simulation modeling method and simulation model of non-parallel cable Download PDFInfo
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Abstract
the invention discloses a crosstalk simulation modeling method of a non-parallel cable and a simulation model thereof, wherein the simulation model at least comprises the following steps: the test method comprises the steps that an interference cable, a disturbed cable and a grounding flat plate are selected, the interference cable or the disturbed cable is selected as a reference cable, an excitation signal with set frequency is applied to one end of the reference cable through an excitation signal applying device, a first load with a specified numerical value is applied to the other end of the reference cable, a first test device for testing the amplitude of the interference signal is arranged at a certain position on the reference cable, another cable outside the reference cable is divided into a plurality of parallel sub-cables which are parallel to the reference cable, second loads with specified numerical values are applied to two ends of the another cable, and a second test device for testing the amplitude of the interference signal is arranged at a certain position on one parallel sub-cable.
Description
Technical Field
The invention relates to the technical field of Radio Frequency Identification (RFID), in particular to a crosstalk simulation modeling method of a non-parallel cable and a simulation model thereof.
Background
The equipment is usually connected by cables, more and more electronic equipment is equipped in narrow space, so various cable harnesses are densely distributed in the narrow space, the cables radiate outwards, crosstalk is extremely easy to occur between the cables, and the mutual crosstalk between the cables is more and more emphasized by people.
Crosstalk simulation between cables is really a research direction in which EMC research of most electronic products needs attention, and the conduction, radiation emission or sensitivity performance of the products can be analyzed more efficiently by simulating and researching crosstalk coupling between cables.
the main theoretical basis for researching cable coupling crosstalk by a plurality of scholars at home and abroad is a transmission line method, which is the most important and most commonly adopted analytic method in cable electromagnetic compatibility modeling analysis, cable crosstalk simulation software commonly used in the industry at present is based on the TLM transmission line theory, and a crosstalk model between cables is replaced by a simpler capacitance-inductance model through the transmission line method to complete cable crosstalk simulation analysis, but the method has certain limitations: the transmission line theory should have certain limitations on the structure and characteristics of the simulated cable, and the application of the transmission line theory is based on parallel cables, and the research on the crosstalk of non-parallel cables is rarely related.
With the development of an electric and electronic system, the cable composition structure, the transmitted signals and the environment are more and more complex and various, the cable laying condition in the equipment is more and more complex, all cables cannot be guaranteed to be parallel to each other, and the non-parallel cable laying in a plurality of products or among the products in the practical engineering can also have crosstalk influence, so that the research on the non-parallel cable crosstalk has certain guiding significance for cable laying.
disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a crosstalk simulation modeling method of a non-parallel cable and a simulation model thereof.
in order to achieve the above object, the present invention provides a crosstalk simulation modeling method for a non-parallel cable, comprising the following steps:
Step S1, laying two cables above a grounding flat plate, wherein one cable is an interference cable, the other cable is a disturbed cable, selecting one cable as a reference cable, applying an excitation signal with a set frequency at one end of the reference cable, applying a first load with a specified value at the other end of the reference cable, and arranging a first test device for testing the amplitude of the interference signal at a certain position on the reference cable;
Step S2, another non-parallel cable is processed in a segmented manner, and is divided into a plurality of parallel sub-cables which are respectively parallel to the reference cable, second loads with specified values are applied to two ends of the disturbed cable, and second testing equipment for testing the amplitude of the interference signal is arranged at a certain position on a certain parallel sub-cable of the disturbed cable;
And step S3, changing the frequency of the excitation signal and the included angle between the two cables, respectively measuring the signal amplitude on the interference cable and the signal amplitude on the interfered cable, recording and analyzing.
Preferably, the length of each segment of parallel sub-wires is no more than one tenth of the wavelength of the excitation signal applied by the reference wire.
Preferably, the parallel sub-cables are connected using a vertical sub-cable or electrical connection line perpendicular to the disturbing cable.
Preferably, the interference cable and the interfered cable are laid in a plane 5cm above the grounding flat plate.
preferably, the first test device and the second test device are detection probes of an oscilloscope or a frequency spectrograph.
In order to achieve the above object, the present invention further provides a crosstalk simulation model of a non-parallel cable, which at least includes: the test method comprises the steps that an interference cable, a disturbed cable and a grounding flat plate are selected, the interference cable or the disturbed cable is selected as a reference cable, an excitation signal with set frequency is applied to one end of the reference cable through an excitation signal applying device, a first load with a specified numerical value is applied to the other end of the reference cable, a first test device for testing the amplitude of the interference signal is arranged at a certain position on the reference cable, another cable outside the reference cable is divided into a plurality of parallel sub-cables which are parallel to the reference cable, second loads with specified numerical values are applied to two ends of the another cable, and a second test device for testing the amplitude of the interference signal is arranged at a certain position on one parallel sub-cable.
preferably, the length of each segment of parallel sub-cable is no more than one tenth of the wavelength of the excitation signal.
Preferably, the parallel sub-cables of each segment are electrically connected by a 3D modeling connection or in a 2D circuit model.
Preferably, when the parallel sub-cables of each segment are connected through 3D modeling, a vertical sub-cable connection perpendicular to the reference cable is adopted.
Preferably, the parallel sub-cables of each segment are connected using electrical connection lines in the 2D circuit model.
compared with the prior art, the crosstalk simulation modeling method of the non-parallel cable and the simulation model thereof have the advantages that two cables are laid above a grounding flat plate, one cable is selected as a reference cable, the other non-parallel cable is subjected to sectional treatment and is divided into a plurality of sections of parallel sub-cables which are respectively parallel to the reference cable, and all the parallel sub-cables are connected by using the vertical sub-cables or the electric connecting wires which are vertical to the interference cables.
Drawings
FIG. 1 is a flow chart of the steps of a crosstalk simulation modeling method for a non-parallel cable according to the present invention;
FIG. 2 is a schematic structural diagram of a crosstalk simulation model of a non-parallel cable according to the present invention;
FIG. 3 is a schematic cross-sectional view of a cable (two-wire set) according to an embodiment of the present invention;
FIG. 4a is a schematic diagram of a continuous 3D segmented string-wound model (segmented 3D connected) according to an embodiment of the present invention;
FIG. 4b is a circuit diagram of a continuous 3D segmented crosstalk model according to an embodiment of the present invention;
FIG. 5a is a schematic diagram of a discontinuous segment series-wound model (segment 2D connection) according to another embodiment of the present invention;
FIG. 5b is a circuit diagram of a discontinuous segmented crosstalk model according to another embodiment of the present invention;
FIG. 6 is a comparison of simulation model results of the present invention;
FIG. 7 is a cross talk test result diagram of the cable of the present invention;
FIG. 8 is a diagram illustrating comparison between simulation and actual measurement results according to the present invention.
Detailed Description
other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a flowchart illustrating steps of a crosstalk simulation modeling method for a non-parallel cable according to the present invention. As shown in fig. 1, the crosstalk simulation modeling method for a non-parallel cable of the present invention includes the following steps:
Step S1, two cables are laid above a ground plane, one of the cables is an interference cable, the other cable is a victim cable, one of the cables is selected as a reference cable, and is determined as a straight line, which may be an interference cable or a victim cable, an excitation signal with a set frequency is applied to one end of the reference cable, a first load with a specified value is applied to the other end of the reference cable, and a first test device for testing the amplitude of the interference signal, such as a test probe of an oscilloscope or a spectrometer, is disposed at a certain position on the reference cable.
step S2, another non-parallel cable (victim cable) is segmented, that is, the non-parallel cable is divided into a plurality of parallel sub-cables which are respectively parallel to the reference cable, the length of each segment of parallel sub-cable is not more than one tenth of the wavelength of the excitation signal applied by the reference cable, a second load with a specified value is applied to two ends of the victim cable, and a second testing device for testing the amplitude of the interference signal, such as a detection probe of an oscilloscope or a spectrometer, is arranged at a certain position on a certain parallel sub-cable of the victim cable. In the present invention, the parallel sub-cables are connected using a vertical sub-cable or an electrical connection line perpendicular to the disturbing cable, and specifically, each segment may be connected by 3D modeling or may be electrically connected in a 2D circuit model.
And step S3, changing the frequency of the excitation signal and the included angle theta between the two cables, respectively measuring the signal amplitude on the interference cable and the signal amplitude on the interfered cable, recording and analyzing.
Fig. 2 is a schematic structural diagram of a crosstalk simulation model of a non-parallel cable according to the present invention. As shown in fig. 2, the crosstalk simulation model of a non-parallel cable according to the present invention at least includes: the method comprises the following steps that an interference cable 101, a disturbed cable 102 and a ground plane (not shown) are laid in a plane 5cm above the ground plane, the interference cable 101 or the disturbed cable 102 is selected as a reference cable, the interference cable 101 is selected as the reference cable and is determined to be a straight line, an excitation signal with set frequency is applied to one end of the reference cable 101 (the interference cable) through an excitation signal applying device 104, a first load 105 with a set value is applied to the other end of the reference cable, and a first testing device 106 for testing the amplitude of the interference signal, such as a detection probe of an oscilloscope or a spectrometer, is arranged somewhere on the reference cable 101; the disturbed cable 102 is a non-parallel cable forming a certain included angle theta with the reference cable 101 (the disturbed cable), the disturbed cable 102 is divided into a plurality of sections of parallel sub-cables parallel to the reference cable 101 according to a preset length, the length of each section of parallel sub-cable is not more than one tenth of the wavelength of the excitation signal, a second load 107 with a designated value is applied to two ends of the disturbed cable 102, a second testing device 108 for testing the amplitude of the interference signal is arranged at a certain position on a certain parallel sub-cable of the disturbed cable 102, such as a detecting probe of an oscilloscope or a spectrometer, the parallel sub-cables of each section can be connected through 3D modeling (for example, a vertical sub-cable perpendicular to the disturbed cable is used for connection), and also can be electrically connected in a 2D circuit model, the frequency of the excitation signal and the included angle theta of the cable are changed, the signal amplitudes on the disturbed cable and the disturbed cable are respectively measured, recorded and analyzed, .
Specifically, the cable crosstalk simulation model is established in CST electromagnetic simulation software and comprises two cables and a grounding flat plate, wherein one cable is an interference cable, the other cable is a disturbed cable, the interference cable and the disturbed cable both adopt double-wire sets, the cross section is shown in figure 3, a dark circular area is a cable conductor, and a light annular area is insulating material outside the conductor.
Selecting a plane of a metal conductor as a grounding flat plate, and laying two cables (according to the requirement of conduction type test arrangement in GJB 151B-2013) in a plane 5cm above the grounding flat plate, wherein the two cables are respectively an interference cable and a disturbed cable; firstly, selecting a line as a reference cable, determining the line as a straight line, wherein the line can be an interference cable or a disturbed cable, and selecting a horizontally placed straight line cable as the interference cable to define the line as the reference cable without loss of generality;
Another non-parallel cable forming an included angle θ with the interference cable is selected as a disturbed cable, the non-parallel disturbed cable is segmented, N segments are divided, each segment of the parallel sub-cable 20i is respectively parallel to the reference cable, the length L0 of each segment of the parallel sub-cable 20i is not more than one tenth of the wavelength of the excitation signal, i is 1,2, … …, N, in this case, 5 segments are divided, i is N is 5, each segment can be connected through continuous 3D segmentation modeling, as shown in fig. 4a, a perpendicular sub-cable 20iV is used between each parallel sub-cable 20i and the other parallel sub-cables 20j (i is not equal to j), i is 1,2, … …, N-1, and the circuit connection diagram is shown in fig. 4 b.
in fig. 4b, port 1 is an excitation port, P1 and P2 are voltage and current detection ports on the cable, and fig. 4b is a circuit connection diagram of the continuous 3D segmented crosstalk simulation model of fig. 4 a. According to the cable cross section shown in fig. 3, the interference cable and the disturbed cable both use double wire sets, so that there are 8 ports (4 interference cables and disturbed cables, respectively) in the equivalent circuit model, and the box in the middle of fig. 4b represents the entire equivalent circuit of the 3D model. Specifically, 201 to 205 are parallel sub-cables, 201V to 204V are vertical sub-cables for connection; the left electrical connection points of the parallel sub-cables 201 are N3_ CG _1_ green _28_0_15 and N3_ CG _1_ yellow _28_0_15, are left electrical connection points of the disturbed cable 20, and are connected with the detection probe P2; the electrical connection points at the right end of the parallel sub-cable 205 are N6_ CG _1_ green _28_0_15 and N6_ CG _1_ yellow _28_0_15, which are the electrical connection points at the right end of the victim cable 20 and are connected with a second set load R2; the left-end electrical connection points of the interference cable 10 are N1_ CG _3_ red _42_0_15 and N1_ CG _3_ black _42_0_15, a detection probe P1 is connected between the port 1 and the left-end connection point N1_ CG _3_ red _42_0_15, the right-end electrical connection points of the interference cable 10 are N5_ CG _3_ red _42_0_15 and N5_ CG _3_ black _42_0_15, and a second set load R1 is connected; the excitation signal is fed in from port 1.
In another embodiment of the present invention, each segmented parallel sub-cable can also be electrically connected in the 2D circuit model, as shown in fig. 5a, and each parallel sub-cable 20i can also be electrically connected with other parallel sub-cables 20j (i ≠ j) in the 2D circuit model, as shown in fig. 5 b.
In fig. 5b, port 1 is an excitation port, P1 and P2 are voltage and current detection ports on the disturbing cable and the victim cable, and fig. 5b is a circuit connection diagram of the discontinuous segmented crosstalk simulation model of fig. 5 a. According to the cable cross section shown in fig. 3, the interference cable and the disturbed cable both adopt double wire sets. Since in fig. 5a) the victim cable is disconnected on the 3D model, in fig. 5b every small segment of the victim cable needs to be connected, while the box in the middle of fig. 5b represents the overall equivalent circuit of the discontinuous sectional crosstalk simulation model.
specifically, the drawings 201-205 are parallel sub-cables; the left electrical connection points of the parallel sub-cables 201 are N3_ CG _1_ yellow _28_0_15 and N3_ CG _1_ green _28_0_15, are left electrical connection points of the disturbed cable 20, and are connected with the detection probe P2; the electrical connection points at the right end of the parallel sub-cable 205 are N6_ CG _7_ yellow _28_0_15 and N6_ CG _7_ green _28_0_15, which are the electrical connection points at the right end of the victim cable 20 and are connected with a second set load R2; the left-end electrical connection points of the interference cable 10 are N1_ CG _3_ red _42_0_15 and N1_ CG _3_ black _42_0_15, a detection probe P1 is connected between the port 1 and the left-end connection point N1_ CG _3_ red _42_0_15, the right-end electrical connection points of the interference cable 10 are N5_ CG _3_ red _42_0_15 and N5_ CG _3_ black _42_0_15, and a second set load R1 is connected; the excitation signal is fed in from port 1.
The left electrical connection points of the parallel sub-cable 201 are N3_ CG _1_ yellow _28 _15 and N3_ CG _1_ green _28_0_15, and the right electrical connection points of the parallel sub-cable 201 are N3_1_ CG _1_ yellow _28_0_15 and N3_1_ CG _1_ green _28_0_ 15;
The left electrical connection points of the parallel sub-cable 202 are N3_2_1_ CG _2_ yellow _28_0_15 and N3_2_1_ CG _2_ green _28_0_15, and the right electrical connection points of the parallel sub-cable 202 are N3_2_2_ CG _2_ yellow _28_0_15 and N3_2_2_ CG _2_ green _28_0_ 15;
the left electrical connection points of the parallel sub-cable 203 are N3_3_1_ CG _4_ yellow _28_0_15 and N3_3_1_ CG _4_ green _28_0_15, and the right electrical connection points of the parallel sub-cable 203 are N3_3_2_ CG _4_ yellow _28_0_15 and N3_3_2_ CG _4_ green _28_0_ 15;
The left electrical connection points of the parallel sub-cable 204 are N3_4_1_ CG _5_ yellow _28_0_15 and N3_4_1_ CG _5_ green _28_0_15, and the right electrical connection points of the parallel sub-cable 204 are N3_4_2_ CG _5_ yellow _28_0_15 and N3_4_2_ CG _5_ green _28_0_ 15;
The left electrical connection points of the parallel sub-cable 205 are N3_5_ CG _7_ yellow _28_0_15 and N3_5_ CG _7_ green _28_0_15, and the right electrical connection points of the parallel sub-cable 205 are N3_6_ CG _7_ yellow _28_0_15 and N3_6_ CG _7_ green _28_0_ 15.
When the electrical connection is carried out, the parallel sub-cables of the double-wire line group of the disturbed cable are respectively connected with:
The parallel sub-cable 201 right electrical connection point N3_1_ CG _1_ yellow _28_0_15 is connected to the parallel sub-cable 202 left electrical connection point N3_2_1_ CG _2_ yellow _28_0_15, the parallel sub-cable 202 right electrical connection point N3_2_ CG _2_ yellow _28_0_15 is connected to the parallel sub-cable 203 left electrical connection point N3_3_1_ CG _4_ yellow _28_0_15, the parallel sub-cable 203 right electrical connection point N3_3_2_ CG _4_ yellow _28 _15 is connected to the parallel sub-cable 204 left electrical connection point N3_4_1_ CG _5_ yellow _28_0_15, the parallel sub-cable 204 right electrical connection point N3_4_2_ CG _5_ yellow _28_0_15 is connected to the parallel sub-cable 204 left electrical connection point N3_ 355 _ yellow _ 350 _ 15;
The parallel sub-cable 201 right electrical connection point N3_1_ CG _1_ green _28_0_15 is connected to the parallel sub-cable 202 left electrical connection point N3_2_1_ CG _2_ green _28_0_15, the parallel sub-cable 202 right electrical connection point N3_2_ CG _2_ green _28_0_15 is connected to the parallel sub-cable 203 left electrical connection point N3_3_1_ CG _4_ green _28_0_15, the parallel sub-cable 203 right electrical connection point N3_3_2_ CG _4_ green _28_0_15 is connected to the parallel sub-cable 204 left electrical connection point N3_4_1_ CG _5_ green _28 _15, and the parallel sub-cable 204 right electrical connection point N3_4_2_ CG _5_ green _28_0_15 is connected to the parallel sub-cable 205 left electrical connection point N3_5_ green _28_0_ 15.
Fig. 6 is a schematic diagram of results obtained by simulation of two connection modes. Taking a sine wave of 400Hz and 115V as excitation, the interference cable is a double-wire set composed of RVB 2_0.75 non-shielding single-core cables, the length is L1 (in this embodiment, L1 is 1m), the interfered cable is a double-wire set composed of RVB _0.5 non-shielding single-core cables, the length is L2 (in this embodiment, L2 is 1.15m), the included angle θ between the two cables is 8.5 degrees in this embodiment (the included angle θ is not related to the segment length L0), and fig. 6 is a comparison of simulation results after unsegmented processing and two kinds of segmented processing, which shows that the simulation results after two kinds of segmentation are not much different, and about 1V different from that after unsegmented processing.
In order to verify the accuracy of the result, a test environment which is consistent with the simulation environment is established in a standard shielding room, a programmable power supply is used for injecting signals into the interference cable through a LISN (Line Impedance Stabilization Network), an electric furnace is used as a pure resistance load, and an oscilloscope is used for detecting the coupling voltage waveform on the interfered cable.
The test results are shown in fig. 7, and fig. 8 is a comparative graph, and it can be seen that the peak value of the coupling voltage waveform is about 1.4V (marked point a), which is only 0.2V different from the simulation result after the segmentation process, and is 1V different from the simulation result without the segmentation process. The method adopted by the invention is well matched with the actual measurement, so that the method provided by the invention is proved to have higher accuracy.
In summary, the crosstalk simulation modeling method of the non-parallel cable and the simulation model thereof provided by the invention are characterized in that two cables are laid above a grounding flat plate, one cable is selected as a reference cable, the other non-parallel cable is subjected to segmentation processing and is divided into a plurality of parallel sub-cables which are respectively parallel to the reference cable, and the parallel sub-cables are connected by using a vertical sub-cable or an electric connecting wire which is perpendicular to an interference cable.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.
Claims (10)
1. A crosstalk simulation modeling method of a non-parallel cable comprises the following steps:
step S1, laying two cables above a grounding flat plate, wherein one cable is an interference cable, the other cable is a disturbed cable, selecting one cable as a reference cable, applying an excitation signal with a set frequency at one end of the reference cable, applying a first load with a specified value at the other end of the reference cable, and arranging a first test device for testing the amplitude of the interference signal at a certain position on the reference cable;
Step S2, another non-parallel cable is processed in a segmented manner, and is divided into a plurality of parallel sub-cables which are respectively parallel to the reference cable, second loads with specified values are applied to two ends of the disturbed cable, and second testing equipment for testing the amplitude of the interference signal is arranged at a certain position on a certain parallel sub-cable of the disturbed cable;
And step S3, changing the frequency of the excitation signal and the included angle between the two cables, respectively measuring the signal amplitude on the interference cable and the signal amplitude on the interfered cable, recording and analyzing.
2. The crosstalk simulation modeling method for a non-parallel cable according to claim 1, characterized in that: the length of each parallel segment of sub-wires is no more than one tenth of the wavelength of the excitation signal applied by the reference wire.
3. The crosstalk simulation modeling method for a non-parallel cable according to claim 1, characterized in that: the parallel sub-cables are connected using a vertical sub-cable or electrical connection line perpendicular to the disturbing cable.
4. the crosstalk simulation modeling method for a non-parallel cable according to claim 1, characterized in that: the interference cable and the interfered cable are laid in a plane 5cm above the grounding flat plate.
5. The crosstalk simulation modeling method for a non-parallel cable according to claim 1, characterized in that: the first test equipment and the second test equipment are detection probes of an oscilloscope or a frequency spectrograph.
6. a crosstalk simulation model for non-parallel cables, comprising at least: the test method comprises the steps that an interference cable, a disturbed cable and a grounding flat plate are selected, the interference cable or the disturbed cable is selected as a reference cable, an excitation signal with set frequency is applied to one end of the reference cable through an excitation signal applying device, a first load with a specified numerical value is applied to the other end of the reference cable, a first test device for testing the amplitude of the interference signal is arranged at a certain position on the reference cable, another cable outside the reference cable is divided into a plurality of parallel sub-cables which are parallel to the reference cable, second loads with specified numerical values are applied to two ends of the another cable, and a second test device for testing the amplitude of the interference signal is arranged at a certain position on one parallel sub-cable.
7. The crosstalk simulation model for a non-parallel cable according to claim 6, wherein: the length of each parallel segment of sub-cable is no more than one tenth of the wavelength of the excitation signal.
8. The crosstalk simulation model for a non-parallel cable according to claim 6, wherein: the parallel sub-cables of each segment are electrically connected through 3D modeling connection or in a 2D circuit model.
9. The crosstalk simulation model for a non-parallel cable according to claim 8, wherein: and when the parallel sub-cables of each segment are connected through 3D modeling, the vertical sub-cables perpendicular to the reference cable are adopted for connection.
10. The crosstalk simulation model for a non-parallel cable according to claim 8, wherein: the segmented parallel sub-cables are connected using electrical connection lines in the 2D circuit model.
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