CN104392022A - Behavioral model-based electromagnetic compatibility circuit-level integrated modeling method for electronic equipment - Google Patents
Behavioral model-based electromagnetic compatibility circuit-level integrated modeling method for electronic equipment Download PDFInfo
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Abstract
The invention discloses a behavioral model-based electromagnetic compatibility circuit-level integrated modeling method for electronic equipment. The behavioral model-based electromagnetic compatibility circuit-level integrated modeling method comprises the following steps: firstly, performing equivalent circuit modeling of a front-end field structure of the electronic equipment; establishing a lumped element circuit model; then, performing behavioral model-based bottom layer physical circuit modeling; establishing a behavioral model for describing the input/output functional characteristics of a circuit; finally, performing integration on the lumped element circuit model and the behavioral model for describing the input/output functional characteristics of the circuit, and establishing an integrated circuit-level model of the electronic equipment, wherein the integrated circuit-level model is uniformly used for simulated analysis of a circuit level. According to the behavioral model-based electromagnetic compatibility circuit-level integrated modeling method disclosed by the invention, calculation is simplified, and a data interface for traditional field-circuit collaborative analysis is omitted, and the problem that a large number of product differential equations are difficult to solve due to high integration level of the circuit in a system and high complexity of digital-analog hybrid is solved; the behavioral model and the circuit model can also mutually compatible, so that the analysis efficiency is improved; the established integrated circuit model is high in universality; parameters of the model can be flexibly adjusted according to the performance of the electronic equipment; the behavioral model-based electromagnetic compatibility circuit-level integrated modeling method is simple, and is easy to implement.
Description
Technical field
The present invention relates to technical field of electromagnetic compatibility, particularly relate to a kind of electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model.
Background technology
The method of the modeling of electronic equipment Electro Magnetic Compatibility and calculating can be summed up as two classes generally: the method for field and the method on road.Concerning the electronic information (such as communication system) of complexity, traditional Modeling Calculation is the thinking adopting field road Cooperative Analysis, as shown in Figure 1, electromagnetic field software is adopted to calculate the electromagnetic property parameters of emitting antenna, receiving antenna and cable respectively, adopt the parameter such as signal waveform, power, frequency spectrum of circuit simulating software calculus communication system internal circuit (transmitting terminal comprises signal generating circuit, radio-frequency front-end and matching network etc., and receiving end comprises matching network, radio-frequency front-end and signal processing circuit etc.).Usually, the result of electromagnetic field analysis is as the time-domain signal etc. of port S parameter, impedance parameter, RESPONSE CALCULATION, need after data-interface reprocessing, the unified analysis to circuit-level, in circuit, complete the calculating of stable state or transient state, time domain or frequency domain, finally obtain the various electromagnetic interference (EMI)/disturbed features such as system signal noise ratio, the bit error rate, waveform distortion.Therefore, EMC analysis is finally the calculating of all problems all being unified circuit-level.
In traditional field road Cooperative Analysis, the electromagnetic compatibility model setting up complex platform electronic equipment still tool acquires a certain degree of difficulty, be mainly reflected in: on the one hand, the analysis of field structure often occurs that size subdivision is complicated, field model calculating can consume a large amount of computer resources, is much more slowly than circuit analysis; On the other hand; along with the rapid raising of complicacy and the development of ultra-large circuit and chip system of integrated circuit integrated level and numerical model analysis system; set up whole system physical circuit model and to adopt emulator to amass solving of the differential equation in a large number also more and more difficult; in addition at the system initial stage; equipment component is in order to technical know-how, and the details of bottom physical circuit are also not exclusively known.The EMC analysis of complex platform electronic equipment is often limited to this type of technical barrier, therefore, need a kind of electromagnetic compatibility road level comprehensive modeling method proposing Behavior-based control model, field structure electromagnetic model is equivalent to circuit model, bottom physical circuit is equivalent to the behavior model describing input/output function characteristic, and carry out comprehensive modeling for unified circuit-level analysis, for the protection Design of complex platform inner electronic equipment electromagnetic compatibility and measures to rectify and reform checking provide effective means.
Summary of the invention
The invention provides a kind of electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model; simplify data-interface when calculating and eliminate traditional field road Cooperative Analysis; solve a large amount of long-pending differential equation difficult problem that circuit high integration and numerical model analysis high complexity in system cause; behavior model and circuit model can also be compatible; improve analysis efficiency; the synthetic circuit model commonality set up is strong; can, according to the parameter of the flexible adjustment model of electronic equipment performance, be simple and easy to realize.
In order to achieve the above object, the invention provides a kind of electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model, comprise following steps:
Carry out the equivalent electrical circuit modeling of electronic equipment front end field structure, set up circuit with lumped element model;
Carry out the bottom physical circuit modeling of Behavior-based control model, set up the behavior model describing circuit input/output function characteristic;
The behavior model of circuit with lumped element model and description circuit input/output function characteristic is carried out comprehensively, sets up the comprehensive road level model of electronic equipment, the unified simulation analysis being used for circuit-level.
Described electronic equipment front end field structure refers to, the front end antenna of electronic equipment, electronic equipment input or output cable, these electronic equipment front end field structures can electromagnetic signals or receive the electromagnetic wave of extraneous radiation.
Described electronic equipment front end field structure comprises the characterisitic parameter of own physical dimensional parameters and external electromagnetic ripple.
Described circuit with lumped element model refers to the equivalent electrical circuit of the lamped element of equivalence and the signal source composition of equivalence, and this equivalent electrical circuit can describe the impedance operator of field structure.
The lamped element of described equivalence comprises not with the circuit model element of frequency change.
Described bottom physical circuit is the remaining circuit structure in electronic equipment except the field structure of front end.
Described behavior model refers to, describe the mathematical model of circuit input/output function characteristic, behavior model meets following restriction relation:
（1）
Wherein, x (t) is the input of bottom physical circuit, and y (t) is the output of bottom physical circuit, and h (t) is the mathematical function of the input/output function characteristic describing bottom physical circuit.
Mathematical function h (t) that identification obtains the input/output function characteristic describing bottom physical circuit is carried out according to the input and output experimental data of bottom physical circuit.
The behavior model of described circuit with lumped element model and description circuit input/output function characteristic comprehensively refers to, the behavior model of circuit with lumped element model and description circuit input/output function characteristic is electrically connected in circuit analysis software, sets up the unification comprehensive road level model describing electronic equipment electromagnetic compatibility characteristic.
Described comprehensive road level model refers to, the Theories and methods of circuit analysis can be adopted to complete the model of calculating, and does not need 3 D electromagnetic field structure, the electromagnetic property factor of considering electronic equipment.
The invention has the advantages that:
1, the front end field structure of electronic equipment is carried out equivalence, be described with circuit with lumped element, the calculating of circuit model faster than electromagnetic field model, and is directly used in the system EMC analysis of electronic equipment, not only simplify data-interface when calculating and can also omit traditional field road Cooperative Analysis.
2, the behavior model describing input-output characteristic is utilized to carry out comprehensive and alternative bottom physical circuit; solve a large amount of long-pending differential equation difficult problem that circuit high integration and numerical model analysis high complexity in system cause; behavior model and circuit model can also be compatible, improve analysis efficiency.
3, the synthetic circuit model commonality set up is strong, can, according to the parameter of the flexible adjustment model of electronic equipment performance, be simple and easy to realize.
Accompanying drawing explanation
Fig. 1 is the field road Cooperative Analysis thinking schematic diagram of traditional transceive communications system;
Fig. 2 is the process flow diagram of the electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model of the present invention;
Fig. 3 is the behavior model schematic diagram describing input-output characteristic;
Fig. 4 is ultra-short wave receiver radio system theory diagram in embodiment;
Fig. 5 is the receiving antenna equivalent circuit diagram set up in embodiment;
Fig. 6 is the behavior model of the description circuit input/output function characteristic set up in embodiment.
Fig. 7 is the ultra-short wave receiver radio system electromagnetic compatibility road level unified model set up in embodiment.
Embodiment
Following according to Fig. 2 ~ Fig. 7, illustrate preferred embodiment of the present invention.
As shown in Figure 2, the invention provides a kind of electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model, comprise following steps:
Step 1, carry out the equivalent electrical circuit modeling of electronic equipment front end field structure, set up circuit with lumped element model;
Described electronic equipment front end field structure refers to, the front end antenna of electronic equipment, electronic equipment input or output cable, these electronic equipment front end field structures can electromagnetic signals or receive the electromagnetic wave of extraneous radiation;
Described electronic equipment front end field structure comprise own physical dimensional parameters (as length h, radius r etc.) and external electromagnetic ripple characterisitic parameter (as signal waveform, action time t etc.);
Described circuit with lumped element model refers to the equivalent electrical circuit of the lamped element of equivalence and the signal source composition of equivalence, and this equivalent electrical circuit can describe the impedance operator of field structure;
The lamped element of described equivalence comprises resistance, inductance, electric capacity etc. not with the circuit model element of frequency change;
Step 2, carry out the bottom physical circuit modeling of Behavior-based control model, set up the behavior model describing circuit input/output function characteristic;
Described bottom physical circuit is the remaining circuit structure in electronic equipment except the field structure of front end;
Described behavior model refers to, the mathematical model of circuit input/output function characteristic is described, the behavior, model was based on the extraction to bottom physical circuit top-level feature, bottom physical circuit is regarded as mathematical model box, ignore the structure and parameter of bottom physical circuit inner member, pay close attention to the input and output performance of circuit and the signal coupling relation of intermodule, circuit model can be compatible with simultaneously, such as resistance R, be exactly by relationship in behavior model, be simply expressed as the linear relationship of voltage and electric current; As shown in Figure 3, behavior model regards bottom physical circuit as mathematical model box as, wherein, x (t) is the input of bottom physical circuit, y (t) is the output of bottom physical circuit, h (t) is for describing the mathematical function of the input/output function characteristic of bottom physical circuit, and behavior model meets following restriction relation:
（1）
Drawing of h (t) function, can (details comprise the parameter listed in bottom circuit handbook according to the details of bottom physical circuit, as the gain compression point of nonlinear characteristic, third order intermodulation truncation points, temperature memory characteristic etc.) draw, also the input and output experimental data of bottom physical circuit can be utilized to carry out identification draw, in identification process, when the experimental data gathered is greater than the number of parameter to be identified, this pure overdetermined problem solve employing least square method, when the number of parameter to be identified is greater than the experimental data of collection, this pure underdetermined problem adopts minimum L2 norm problem solving,
Step 3, circuit with lumped element model and the behavior model that describes circuit input/output function characteristic are carried out comprehensively, set up the comprehensive road level model of electronic equipment, the unified simulation analysis for circuit-level;
Described comprehensively refers to circuit model and behavior model, by the behavior model of foundation in the circuit model of foundation in step 1 and step 2 at circuit analysis software (the ADS software of such as Agilent company, Matlab software etc.) in carry out being electrically connected (the output of front end, connect the input of rear end), set up the unified circuit model describing electronic equipment electromagnetic compatibility characteristic;
Described comprehensive road level model refers to, the Theories and methods of circuit analysis can be adopted to complete the model of calculating, and does not need the factor such as 3 D electromagnetic field structure, electromagnetic property considering electronic equipment.
With an embodiment, the application of the present invention in the modeling of ultra-short wave receiver system electromagnetic compatibility is described below, as shown in Figure 4, it is the circuit structure diagram of certain ultra-short wave receiver radio system, this ultra-short wave receiver radio system comprises receiving antenna 1, the front-end low-noise being electrically connected receiving antenna 1 puts 2, be electrically connected the filtering A module 3 that front-end low-noise puts 2, the the first frequency mixing module 4(being electrically connected filtering A module 3 inputs the first local oscillation signal), be electrically connected the first intermediate frequency filtering module 5 of the first frequency mixing module 4, be electrically connected the first intermediate frequency amplification module 6 of the first intermediate frequency filtering module 5, the the second frequency mixing module 7(being electrically connected the first intermediate frequency amplification module 6 inputs the second local oscillation signal), be electrically connected the second intermediate frequency filtering module 8 of the second frequency mixing module 7, be electrically connected the second intermediate frequency amplification module 9 of the second intermediate frequency filtering module 8, B module 10(output intermediate-freuqncy signal is amplified in the compensation being electrically connected the second intermediate frequency amplification module 9).
The front-end low-noise major parameter put in 2 is gain amplifier 8 dB, noise figure 2.8 dB, three rank truncation points power 30 dBm; Frequency 150 MHz centered by major parameter in filtering A module 3, pass band width 2 MHz, pass band damping 0.3 dB, stopband attenuation 30 dB, cut off band width 8 MHz; Major parameter in first frequency mixing module 4 is gain 6 dB, noise figure 7 dB, three rank truncation points power 35 dBm, local frequency 1002.466 MHz; Frequency 852.466 MHz centered by major parameter in first intermediate frequency filtering module 5, pass band width 10 MHz, pass band damping 0.3 dB, stopband attenuation 30 dB, cut off band width 80 MHz; Major parameter in first intermediate frequency amplification module 6 is gain 10 dB, noise figure 9.5 dB, three rank truncation points power 50 dBm; Major parameter in second frequency mixing module 7 is gain 6 dB, noise figure 7 dB, three rank truncation points power 55 dBm, local frequency 836.76 MHz; Frequency 15.706 MHz centered by major parameter in second intermediate frequency filtering module 8, pass band width 68 kHz, ripple 0.5 dB, stopband attenuation 20 dB, cut off band width 544 kHz in band; Major parameter in second intermediate frequency amplification module 9 is gain 25 dB, noise figure 9.5 dB, three rank truncation points power 40 dBm; Compensating amplification B module 10 major parameter is gain 32 dB, noise figure 8 dB, three rank truncation points power 40 dBm.
Carry out the ultra-short wave receiver system electromagnetic compatibility road level comprehensive modeling of Behavior-based control model as follows:
Step 1: the equivalent electrical circuit modeling carrying out ultra-short wave receiver system front end field structure, sets up circuit with lumped element model;
In this embodiment, ultra-short wave receiver system front end field structure is receiving antenna 1, the dipole antenna of feed centered by receiving antenna 1, total length h=1m, radius r=1mm, under receiving antenna 1 is placed in the electromagnetic pulse interference irradiation in far field, electromagnetic pulse incident electric fields and antenna angle theta=30o, electromagnetic pulse field intensity parameter is:
（2）
In formula:
for peak electric field, value 50kV/m; K is correction factor, gets 1.3; α is the parameter characterizing pulse front edge, value 4 × 107s-1; β is the parameter characterizing pulse back edge, value 6 × 108s-1.
In this embodiment, adopt the circuit be made up of five lamped elements and equivalent voltage source to describe the impedance operator of receiving antenna 1, as shown in Figure 5, five lamped elements are the first electric capacity C
0, the first inductance L
0, the second electric capacity C
1, the second inductance L
1with the first electric capacity R
1, the second electric capacity C
1, the second inductance L
1with the first electric capacity R
1after parallel connection, with the first electric capacity C
0with the first inductance L
0be connected on equivalent voltage source
two ends, the parameter of five lamped elements sees the following form.
Electromagnetic pulse normally produces in high-altitude, and can be considered as plane wave when arriving receiving system, and electromagnetic pulse main energetic concentrates in lower frequency band range, the electromagnetic wave that receiving antenna 1 receives can use equivalent voltage source
represent:
（3）
In formula:
for polarizing angle, value is 0o in the present embodiment.
Step 2: the bottom physical circuit modeling carrying out Behavior-based control model, sets up the behavior model describing circuit input/output function characteristic;
As shown in Figure 6, set up the behavior model describing circuit input/output function characteristic, the behavior model set up comprises front-end low-noise and puts 2, be electrically connected the filtering A module 3 that front-end low-noise puts 2, be electrically connected the first frequency mixing module 4 of filtering A module 3, be electrically connected the first intermediate frequency filtering module 5 of the first frequency mixing module 4, be electrically connected the first intermediate frequency amplification module 6 of the first intermediate frequency filtering module 5, be electrically connected the second frequency mixing module 7 of the first intermediate frequency amplification module 6, be electrically connected the second intermediate frequency filtering module 8 of the second frequency mixing module 7, be electrically connected the second intermediate frequency amplification module 9 of the second intermediate frequency filtering module 8, B module 10 is amplified in the compensation being electrically connected the second intermediate frequency amplification module 9.Front-end low-noise is put 2 and is amplified to the received signal, filtering is carried out in filtering A module 3 after amplification, output becomes the first intermediate-freuqncy signal after entering the first frequency mixing module 4 and the first local oscillation signal mixing, first intermediate-freuqncy signal enters the first intermediate frequency filtering module 5, first intermediate frequency amplification module 6 carries out filtering, amplify, the second intermediate-freuqncy signal is become after its output signal enters the second frequency mixing module 7 and the second local oscillation signal mixing, second intermediate-freuqncy signal enters the second intermediate frequency filtering module 8 again, second intermediate frequency amplification module 9 carries out filtering, amplify, its output signal obtains final intermediate frequency and exports after over-compensation amplification B module 10 is amplified, frequency is 15.706MHz.
Step 3: the circuit model set up in step 1 and step 2 and behavior model are carried out comprehensively, sets up the comprehensive road level model of ultra-short wave receiver system, for the simulation analysis of circuit-level.
According to the receiving antenna equivalent circuit diagram that Fig. 5 provides, in circuit simulating software, build the equivalent-circuit model of field structure, by equivalent voltage source
export undesired signal, through the equivalent electrical circuit of five lamped elements composition laggard enter the radio-frequency head of ultra-short wave receiver system; Again according to the theory diagram in Fig. 4, establish the behavior model of the later modules of ultra-short wave receiver system except receiving antenna 1 of receiving antenna as shown in Figure 6.Two parts model carries out comprehensively in circuit simulating software the most at last, set up electromagnetic compatibility road level unified model as shown in Figure 7, circuit analysis will be directly used in, complete the calculating of stable state or transient state, time domain or frequency domain, finally obtain the various electromagnetic interference (EMI)/disturbed features such as system signal noise ratio, the bit error rate, waveform distortion, thus the Electro Magnetic Compatibility of prediction or assessment receiver system under Electromagnetic Radiation.
The invention has the advantages that:
1, the front end field structure of electronic equipment is carried out equivalence, be described with circuit with lumped element, the calculating of circuit model faster than electromagnetic field model, and is directly used in the system EMC analysis of electronic equipment, not only simplify data-interface when calculating and can also omit traditional field road Cooperative Analysis.
2, the behavior model describing input-output characteristic is utilized to carry out comprehensive and alternative bottom physical circuit; solve a large amount of long-pending differential equation difficult problem that circuit high integration and numerical model analysis high complexity in system cause; behavior model and circuit model can also be compatible, improve analysis efficiency.
3, the synthetic circuit model commonality set up is strong, can, according to the parameter of the flexible adjustment model of electronic equipment performance, be simple and easy to realize.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. an electronic equipment electromagnetic compatibility road level comprehensive modeling method for Behavior-based control model, is characterized in that, comprise following steps:
Carry out the equivalent electrical circuit modeling of electronic equipment front end field structure, set up circuit with lumped element model;
Carry out the bottom physical circuit modeling of Behavior-based control model, set up the behavior model describing circuit input/output function characteristic;
The behavior model of circuit with lumped element model and description circuit input/output function characteristic is carried out comprehensively, sets up the comprehensive road level model of electronic equipment, the unified simulation analysis being used for circuit-level.
2. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 1, it is characterized in that, described electronic equipment front end field structure refers to, the front end antenna of electronic equipment, electronic equipment input or output cable, these electronic equipment front end field structures can electromagnetic signals or receive the electromagnetic wave of extraneous radiation.
3. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 2, it is characterized in that, described electronic equipment front end field structure comprises the characterisitic parameter of own physical dimensional parameters and external electromagnetic ripple.
4. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 1, it is characterized in that, described circuit with lumped element model refers to the equivalent electrical circuit of the lamped element of equivalence and the signal source composition of equivalence, and this equivalent electrical circuit can describe the impedance operator of field structure.
5. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 4, it is characterized in that, the lamped element of described equivalence comprises not with the circuit model element of frequency change.
6. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 1, it is characterized in that, described bottom physical circuit is the remaining circuit structure in electronic equipment except the field structure of front end.
7. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 1, it is characterized in that, described behavior model refers to, describe the mathematical model of circuit input/output function characteristic, behavior model meets following restriction relation:
（1）
Wherein, x (t) is the input of bottom physical circuit, and y (t) is the output of bottom physical circuit, and h (t) is the mathematical function of the input/output function characteristic describing bottom physical circuit.
8. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 7, it is characterized in that, carry out according to the input and output experimental data of bottom physical circuit mathematical function h (t) that identification obtains the input/output function characteristic describing bottom physical circuit.
9. as the electronic equipment electromagnetic compatibility road level comprehensive modeling method of the Behavior-based control model in claim 1-8 as described in any one, it is characterized in that, the behavior model of described circuit with lumped element model and description circuit input/output function characteristic comprehensively refers to, the behavior model of circuit with lumped element model and description circuit input/output function characteristic is electrically connected in circuit analysis software, sets up the unification comprehensive road level model describing electronic equipment electromagnetic compatibility characteristic.
10. the electronic equipment electromagnetic compatibility road level comprehensive modeling method of Behavior-based control model as claimed in claim 9, it is characterized in that, described comprehensive road level model refers to, the Theories and methods of circuit analysis can be adopted to complete the model of calculating, and do not need 3 D electromagnetic field structure, the electromagnetic property factor of considering electronic equipment.
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| CN105302958A (en) * | 2015-10-28 | 2016-02-03 | 北京交通大学 | Method for establishing high-speed train system-level electromagnetic compatibility model |
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| CN112180179A (en) * | 2020-10-10 | 2021-01-05 | 中车青岛四方机车车辆股份有限公司 | Electromagnetic compatibility analysis method and device |
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| CN105302958A (en) * | 2015-10-28 | 2016-02-03 | 北京交通大学 | Method for establishing high-speed train system-level electromagnetic compatibility model |
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