CN105975713A - Method for predicting electromagnetic radiation of electronic circuit through source reconstruction - Google Patents
Method for predicting electromagnetic radiation of electronic circuit through source reconstruction Download PDFInfo
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Abstract
The invention relates to a method for predicting electromagnetic radiation of an electronic circuit through source reconstruction. The method includes the following steps that 1, near-field data is obtained through simulation or tests; 2, suitable equivalent sources are selected; 3, equivalent source models are set up for different scenes; 4, an inverse algorithm is used for solving values of the equivalent sources; 5, electromagnetic radiation of the electronic circuit is predicted through the equivalent sources in the steps from 1 to 4. Far field electromagnetic radiation characteristics of an electronic system do not need to be measured, the equivalent sources can be constructed just by simulating or testing near field electromagnetic radiation characteristics to deduce the far field electromagnetic radiation characteristics of the electronic system, electromagnetic radiation of the electronic circuit and region, generating large electromagnetic radiation, in the electronic system can be predicted, and therefore electromagnetic compatibility can be improved better.
Description
Technical field
The present invention provides a kind of method using source method for reconstructing prediction electronic circuit electromagnetic radiation, and it relates to a kind of being suitable for
In the method for prediction electromagnetic radiation, more particularly, a kind of employing source method for reconstructing prediction electronic circuit electromagnetism spoke is referred to
The method penetrated.Belong to technical field of electromagnetic compatibility.
Background technology
The propagation of electromagnetic energy is divided into electromagnetic conductive and two aspects of electromagnetic radiation.For electromagnetic conductive, can be by means of
Circuit theory, sets up equivalent-circuit model to chip, basic components and parts, cabling, via etc., carries out at output port
Measure and analyze；For electromagnetic radiation, some dipoles (electric dipole and magnetic dipole) electromagnetism substantially can be considered as
The superposition of radiation.In modern electronic system design, electromagnetic radiation is a key of electromagnetic compatibility.Electromagnetic radiation
It is the most normal that size is directly connected to electronic system function, if can work with other equipment simultaneously.If electromagnetic radiation
Exceeding standard, bring electromagnetic interference, do not meet relevant EMC Standard, electronic system design does not just meet and wants
Ask.And certain difficulty be presently, there are for the prediction of electromagnetic radiation size in electronic system, thus have impact on Department of Electronics
The EMC Design of system.
Summary of the invention
It is an object of the invention to provide a kind of method using source method for reconstructing prediction electronic circuit electromagnetic radiation, it proposes
A kind of method source method for reconstructing (SRM) of prediction electronic system electromagnetic radiation.Source method for reconstructing is a kind of based on long-pending
The method dividing equation, its theoretical basis is the principle of equal effects in electromagnetic field, and the principle of equal effects is i.e. at the electricity within the confined space
Magnetic radiation source can be with the electromagnetic current equivalent substitution on the closed surface of the besieged confined space, outside the confined space after replacement
The field value in portion with substitute before the confined space outside field value be duplicate.
A kind of method using source method for reconstructing prediction electronic circuit electromagnetic radiation of the present invention, its step is as follows:
Step one: obtain Near-field Data by emulation or test；
Step 2: choose suitable equivalent source；
Step 3: set up equivalent source model for different scenes；
Step 4: utilize inversion algorithm to solve the value of equivalent source；
Step 5: by the electromagnetic radiation of the equivalent source prediction electronic circuit that step one to step 4 is set up.
The method of the invention flow chart is as shown in Figure 1.
Wherein, in " the obtaining Near-field Data by emulation or test " described in step one, its way is as follows:
(1) Near-field Data is obtained by emulation: described " emulation " may utilize the electromagnetic-field simulation such as HFSS, FEKO
Software is carried out, and its specific practice obtaining Near-field Data is as follows: first setting up in electromagnetic field simulation software needs prediction
The model of the electronic circuit of electromagnetic radiation, then adds suitably excitation Analogical Electronics on model and normally works,
Simulation parameter is set afterwards, utilizes electromagnetic field simulation software emulation to obtain the Near-field Data of electronic circuit.
(2) Near-field Data is obtained by test: described " test " can utilize electromagnetic field to test in microwave dark room
Equipment is carried out, and specific practice is as follows: first the electronic circuit predicting electromagnetic radiation will be needed to be placed on testboard, then
Electronic circuit adds suitably excitation be allowed to normally work, utilize near field probes connecting test system to obtain afterwards
The Near-field Data of electronic circuit.
Wherein, " equivalent source " described in step 2, refer to magnetic dipole or electric dipole, choosing method is as follows:
Theoretically, it is all feasible for using magnetic dipole and electric dipole carry out source to rebuild.Ask when measuring in view of reality
During topic, such as near-field test, generally measuring magnetic field can be easier to than measuring electric field, and electric field probe would generally be right
Far field itself produces disturbance, causes the deviation of measurement result, so generally choosing magnetic dipole as in the method for reconstructing of source
Equivalent source.
Wherein, " the setting up equivalent source model for different scenes " described in step 3, its way is as follows: utilize
The electromagnetic radiation formula of magnetic dipole or electric dipole carries out deriving and being taken into account by the electromagnetic radiation environment of equivalent source；
Such as ground, it is the reflection that can cause electromagnetic field owing to ground faces the effect of equivalent source, therefore can use mirror
As theory is analyzed, by the effect on ground comprehensively in the middle of equivalent source electromagnetic radiation field；For enclosed environment, such as gold
Belong to cavity, need to be considered as metallic cavity waveguide, and equivalent source is considered as waveguide excitation；
Wherein, " the utilizing inversion algorithm to solve the value of equivalent source " described in step 4, its practice is as follows: at meter
Calculation machine writes suitable source algorithm for reconstructing, then by step one or Near-field Data and step 2 step 3 in institute
The equivalent source model chosen imports in the algorithm for reconstructing of source, utilizes the value of computer solving equivalent source.Due to source method for reconstructing
Being a kind of method based on integral equation, take when carrying out source method for reconstructing prediction electromagnetic radiation is discretization numerical value
Implementation, therefore, inversion algorithm is substantially the process processing big numerical quantity, i.e. carries out matrix operations.
If known source being solved field regard forward as, then source method for reconstructing is exactly substantially the inversion process of matrix.Institute
" inversion algorithm " stated, mainly includes method of least square, genetic algorithm etc..
Wherein, " prediction " described in step 5, its concrete way is to utilize step one to be set up to step 4
Equivalent source in electromagnetic field simulation software, simulate far field electromagnetic radiation and the near-field electromagnetic radiation of electronic system, and can
To determine the power of equipment equivalent position electromagnetic radiation ability everywhere, position major electromagnetic radiation areas, and carry out electromagnetism
Compatible improvement.
By above step, invention achieves prediction electronic circuit electromagnetic radiation thus carry out electromagnetic compatibility analysis
Purpose, solves present stage electronic circuit electromagnetic radiation test request and cost is high, is difficult to carry out electromagnetic compatibility analysis
Practical problem.
The present invention compared with prior art, has following advantage and effect the most significantly:
First, it is not necessary to measure the far field electromagnetic radiation characteristic of electronic system: present stage is for the far field electromagnetic of electronic system
The test request of radiation characteristic and relatively costly, not all mechanism all has test condition.The present invention has only to emulation
Or test electronic system near-field electromagnetic radiation characteristic just can set up equivalent source and release far field electromagnetic radiation characteristic.
Second, the EMC analysis in terms of electronic system electromagnetic radiation is provided a method that: at present for electricity
Analysis and the improvement of subsystem electromagnetic compatibility there be difficulties involved when, especially electromagnetic radiation aspect.The present invention can be pre-
The electromagnetic radiation characteristic of survey electronic circuit and electronic system produce the region that electromagnetic radiation is bigger, thus preferably carries out
Electromagnetic compatibility improves.
Accompanying drawing explanation
Fig. 1 is the method for the invention flow chart.
Detailed description of the invention
A kind of method using source method for reconstructing prediction electronic circuit electromagnetic radiation of the present invention, as shown in Figure 1, its step
As follows:
Step one: obtain Near-field Data by emulation or test；
(1) Near-field Data is obtained by emulation: described " emulation " may utilize the electromagnetic fields such as HFSS, FEKO
Simulation software is carried out, and its specific practice obtaining Near-field Data is as follows: first build in electromagnetic field simulation software
The vertical model needing to predict the electronic circuit of electromagnetic radiation, then adds suitably excitation simulation electricity on model
Electronic circuit normally works, and arranges simulation parameter afterwards, utilizes electromagnetic field simulation software emulation to obtain electronic circuit
Near-field Data.
(2) Near-field Data is obtained by test: described " test " can utilize electromagnetic field to survey in microwave dark room
Examination equipment is carried out, and its specific practice obtaining Near-field Data is as follows: first will need to predict the electricity of electromagnetic radiation
Electronic circuit is placed on testboard, then adds suitably excitation on electronic circuit and is allowed to normally work, afterwards
Near field probes connecting test system is utilized to obtain the Near-field Data of electronic circuit.
Obtain Near-field Data it is crucial that Near-field Data amplitude and the accuracy of phase place.
Step 2: choose suitable equivalent source；
Described " equivalent source ", refers to magnetic dipole or electric dipole, and choosing method is as follows: theoretically, makes
It is all feasible for carry out source rebuilding with magnetic dipole and electric dipole.When in view of actual measurement problem, as
Near-field test, generally measuring magnetic field can be easier to than measuring electric field, and electric field probe would generally be to far field
Itself produces disturbance, causes the deviation of measurement result, so generally choosing magnetic dipole as in the method for reconstructing of source
Equivalent source.
Step 3: set up equivalent source model for different scenes；
Described " setting up equivalent source model for different scenes ", its way is as follows: utilize magnetic dipole or galvanic couple
The extremely electromagnetic radiation formula of son carries out deriving and being taken into account by the electromagnetic radiation environment of equivalent source；Such as ground
Face, is the reflection that can cause electromagnetic field owing to ground faces the effect of equivalent source, therefore can use image theory
It is analyzed, by the effect on ground comprehensively in the middle of equivalent source electromagnetic radiation field；For enclosed environment, such as metal
Cavity, needs to be considered as metallic cavity waveguide, and equivalent source is considered as waveguide excitation；
Step 4: utilize inversion algorithm to solve the value of equivalent source；
Described " utilizing the value that inversion algorithm solves equivalent source ", its practice is as follows: it is suitable to write in a computer
Source algorithm for reconstructing, then by equivalence selected in the Near-field Data obtained in step one and step 2 step 3
Source model imports in the algorithm for reconstructing of source, utilizes the value of computer solving equivalent source.Owing to source method for reconstructing is a kind of
Method based on integral equation, take when carrying out source method for reconstructing prediction electromagnetic radiation is discretization numerical value
Implementation, therefore, inversion algorithm is substantially the process processing big numerical quantity, i.e. carries out matrix fortune
Calculate.If known source being solved field regard forward as, then source method for reconstructing is exactly substantially inverting of matrix
Process.And the matrix that actually source method for reconstructing produces differs and is set to square formation, even and square formation, square formation row
Column is likely to be zero, additionally, due to the truncated error of computer, carries out matrix inversion and can cause the generation of error,
So the error controlling inversion algorithm is also crucial, error control mode to be used, such as regularization method,
Block SVD method, differential evolution method etc..Described " inversion algorithm ", mainly include method of least square,
Genetic algorithm etc..
Step 5: by the electromagnetic radiation of the equivalent source prediction electronic circuit that step one to step 4 is set up.
Described " prediction ", its concrete way is that the equivalent source utilizing step one to step 4 to be set up is at electromagnetism
Field simulation software simulates far field electromagnetic radiation and the near-field electromagnetic radiation of electronic system, it is possible to determine equipment
The power of equivalent position electromagnetic radiation ability everywhere, positions major electromagnetic radiation areas, and carries out electromagnetic compatibility and change
Enter.
By above step, invention achieves prediction electronic circuit electromagnetic radiation thus carry out electromagnetic compatibility analysis
Purpose, solve present stage electronic circuit electromagnetic radiation test request and cost high, be difficult to carry out Electro Magnetic Compatibility and divide
The practical problem of analysis.
Claims (2)
1. the method using source method for reconstructing prediction electronic circuit electromagnetic radiation, it is characterised in that: it is embodied as step
Rapid as follows:
Step one: by emulation and test acquisition Near-field Data:
(1) Near-field Data is obtained by emulation: described " emulation " is to utilize HFSS, FEKO electromagnetic field to imitate
True software is carried out, and its specific practice obtaining Near-field Data is as follows: first set up in electromagnetic field simulation software
Need to predict the model of the electronic circuit of electromagnetic radiation, then add on model and suitably encourage simulation electronic
Normal circuit operation, arranges simulation parameter afterwards, utilizes electromagnetic field simulation software emulation to obtain electronic circuit
Near-field Data；
(2) Near-field Data is obtained by test: described " test " is to utilize electromagnetic field to survey in microwave dark room
Examination equipment is carried out, and its specific practice obtaining Near-field Data is as follows: first will need to predict the electricity of electromagnetic radiation
Electronic circuit is placed on testboard, then adds suitably excitation on electronic circuit and is allowed to normally work, afterwards
Near field probes connecting test system is utilized to obtain the Near-field Data of electronic circuit；
Obtain Near-field Data it is crucial that Near-field Data amplitude and the accuracy of phase place；
Step 2: choose suitable equivalent source:
Described " equivalent source ", refers to magnetic dipole, generally choose magnetic dipole as in the method for reconstructing of source etc.
Effect source；
Step 3: set up equivalent source model for different scenes:
The electromagnetic radiation formula utilizing magnetic dipole carries out deriving and being taken into account by the electromagnetic radiation environment of equivalent source；
Such as ground, it is the reflection that can cause electromagnetic field owing to ground faces the effect of equivalent source, therefore uses mirror
As theory is analyzed, by the effect on ground comprehensively in the middle of equivalent source electromagnetic radiation field；For enclosed environment, than
Such as metallic cavity, need to be considered as metallic cavity waveguide, and equivalent source is considered as waveguide excitation；
Step 4: utilize inversion algorithm to solve the value of equivalent source:
Write predetermined source algorithm for reconstructing in a computer, then by the Near-field Data obtained in step one and step 2
Equivalent source model selected in step 3 imports in the algorithm for reconstructing of source, utilizes the value of computer solving equivalent source；
Step 5: by the electromagnetic radiation of the equivalent source prediction electronic circuit that step one to step 4 is set up:
Described " prediction ", its concrete way is that the equivalent source utilizing step one to step 4 to be set up is at electromagnetism
Field simulation software simulates far field electromagnetic radiation and the near-field electromagnetic radiation of electronic system, and determines equipment equivalence
The power of position electromagnetic radiation ability everywhere, positions major electromagnetic radiation areas, and carries out electromagnetic compatibility improvement；
By above step, invention achieves prediction electronic circuit electromagnetic radiation thus carry out Electro Magnetic Compatibility and divide
The purpose of analysis, solves present stage electronic circuit electromagnetic radiation test request and cost is high, it is double to be difficult to carry out electromagnetism
The practical problem that capacitive is analyzed.
A kind of method using source method for reconstructing prediction electronic circuit electromagnetic radiation the most according to claim 1, it is special
Levy and be: " equivalent source " described in step 2 is electric dipole.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107966616A (en) * | 2016-10-19 | 2018-04-27 | 郑州宇通客车股份有限公司 | Motor vehicle electromagnetic Flied emission strength test method based on car body threedimensional model |
| CN108872739A (en) * | 2018-05-10 | 2018-11-23 | 中国人民解放军陆军工程大学 | Equivalent test method for electromagnetic radiation effect of glowing bridge wire type electric explosion device |
| CN109521456A (en) * | 2018-09-25 | 2019-03-26 | 中国辐射防护研究院 | A kind of gamma emitter item inversion method and system based on regularization least square method |
| CN110047419A (en) * | 2019-04-30 | 2019-07-23 | 深圳市华星光电半导体显示技术有限公司 | Improve the driving device and its method of the electromagnetic radiation of GOA circuit |
| CN110108354A (en) * | 2019-06-03 | 2019-08-09 | 合肥工业大学 | A method of passing through noise in small size semianechoic room interior prediction vehicle |
| CN112270140A (en) * | 2020-09-29 | 2021-01-26 | 北京遥测技术研究所 | Far-field inversion near-field distribution method for explosive shock wave overpressure prediction |
| CN112577592A (en) * | 2020-11-27 | 2021-03-30 | 哈尔滨工程大学 | Finite space plane near-field acoustic holography measuring method based on space Fourier transform |
| CN112926231A (en) * | 2020-11-27 | 2021-06-08 | 哈尔滨工程大学 | Near-field acoustic holography measurement method in finite space based on equivalent source method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107966616A (en) * | 2016-10-19 | 2018-04-27 | 郑州宇通客车股份有限公司 | Motor vehicle electromagnetic Flied emission strength test method based on car body threedimensional model |
| CN108872739A (en) * | 2018-05-10 | 2018-11-23 | 中国人民解放军陆军工程大学 | Equivalent test method for electromagnetic radiation effect of glowing bridge wire type electric explosion device |
| CN108872739B (en) * | 2018-05-10 | 2020-11-13 | 中国人民解放军陆军工程大学 | Equivalent test method for electromagnetic radiation effect of glowing bridge wire type electric explosion device |
| CN109521456A (en) * | 2018-09-25 | 2019-03-26 | 中国辐射防护研究院 | A kind of gamma emitter item inversion method and system based on regularization least square method |
| CN109521456B (en) * | 2018-09-25 | 2022-10-21 | 中国辐射防护研究院 | Gamma radiation source item inversion method and system based on regularization least square method |
| CN110047419A (en) * | 2019-04-30 | 2019-07-23 | 深圳市华星光电半导体显示技术有限公司 | Improve the driving device and its method of the electromagnetic radiation of GOA circuit |
| CN110108354A (en) * | 2019-06-03 | 2019-08-09 | 合肥工业大学 | A method of passing through noise in small size semianechoic room interior prediction vehicle |
| CN112270140A (en) * | 2020-09-29 | 2021-01-26 | 北京遥测技术研究所 | Far-field inversion near-field distribution method for explosive shock wave overpressure prediction |
| CN112270140B (en) * | 2020-09-29 | 2023-10-17 | 北京遥测技术研究所 | Far-field inversion near-field distribution method for explosion shock wave overpressure prediction |
| CN112577592A (en) * | 2020-11-27 | 2021-03-30 | 哈尔滨工程大学 | Finite space plane near-field acoustic holography measuring method based on space Fourier transform |
| CN112926231A (en) * | 2020-11-27 | 2021-06-08 | 哈尔滨工程大学 | Near-field acoustic holography measurement method in finite space based on equivalent source method |
| CN112926231B (en) * | 2020-11-27 | 2023-06-20 | 哈尔滨工程大学 | Near-field acoustic holographic measurement method in limited space based on equivalent source method |
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