CN105975713B - A method of electronic circuit electromagnetic radiation is predicted using source method for reconstructing - Google Patents
A method of electronic circuit electromagnetic radiation is predicted using source method for reconstructing Download PDFInfo
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Abstract
A method of electronic circuit electromagnetic radiation being predicted using source method for reconstructing, its step are as follows: one: by emulating or testing acquisition Near-field Data；Two: choosing suitable equivalent source；Three: establishing equivalent source model for different scenes；Four: the value of equivalent source is solved using inversion algorithm；Five: the electromagnetic radiation of electronic circuit is predicted by the equivalent source that step 1 to step 4 is established；The present invention is not necessarily to measure the far field electromagnetic radiation characteristic of electronic system, it is only necessary to which the near-field electromagnetic radiation characteristic of emulation or test electronic system can establish equivalent source and release far field electromagnetic radiation characteristic；It can predict to generate the biggish region of electromagnetic radiation in the electromagnetic radiation characteristic and electronic system of electronic circuit, to preferably carry out electromagnetic compatibility improvement.
Description
Technical field
The present invention provides a kind of method using the prediction electronic circuit electromagnetic radiation of source method for reconstructing, it is related to a kind of be applicable in
In the method for prediction electromagnetic radiation, more particularly, refer to a kind of using the prediction electronic circuit electromagnetic radiation of source method for reconstructing
Method.Belong to technical field of electromagnetic compatibility.
Background technique
The propagation of electromagnetic energy is divided into two aspects of electromagnetic conductive and electromagnetic radiation.It, can be by means of for electromagnetic conductive
Circuit theory establishes equivalent-circuit model to chip, basic component, cabling, via hole etc., measures point in output port
Analysis；For electromagnetic radiation, it can substantially be considered as the superposition of several dipoles (electric dipole and magnetic dipole) electromagnetic radiation.?
In modern electronic system design, electromagnetic radiation is a key of electromagnetic compatibility.The size of electromagnetic radiation is directly related to electronics
Whether system function is normal, if can work at the same time with other equipment.If electromagnetic radiation is exceeded, it is dry to bring electromagnetic radiation
It disturbs, does not meet related EMC Standard, electronic system design is with regard to undesirable.And for electromagnetic radiation in electronic system
Presently, there are certain difficulties for the prediction of size, to affect the EMC Design of electronic system.
Summary of the invention
The object of the present invention is to provide a kind of methods using the prediction electronic circuit electromagnetic radiation of source method for reconstructing, it is proposed
Predict a kind of method --- the source method for reconstructing (SRM) of electronic system electromagnetic radiation.Source method for reconstructing is a kind of based on integral side
The method of journey, theoretical basis are the principle of equal effects in electromagnetic field, and the principle of equal effects is the electromagnetic radiation source in portion in a limited space
The electromagnetic current equivalent substitution that can be surrounded on the closed surface of the confined space, field value outside the confined space after substitution with replace
It is duplicate for the field value outside the preceding confined space.
A kind of method using the prediction electronic circuit electromagnetic radiation of source method for reconstructing of the present invention, its step are as follows:
Step 1: by emulating or testing acquisition Near-field Data；
Step 2: suitable equivalent source is chosen；
Step 3: equivalent source model is established for different scenes；
Step 4: the value of equivalent source is solved using inversion algorithm；
Step 5: the electromagnetic radiation of electronic circuit is predicted by the equivalent source that step 1 to step 4 is established.
The method of the invention flow chart is as shown in Figure 1.
Wherein, " obtaining Near-field Data by emulating or testing " described in step 1, way is as follows:
(1) by emulation obtain Near-field Data: " emulation " using the electromagnetic field simulation softwares such as HFSS, FEKO into
Row, the specific practice for obtaining Near-field Data are as follows: establishing first in electromagnetic field simulation software and need to predict electromagnetic radiation
Then the model of electronic circuit adds suitable excitation Analogical Electronics on model and works normally, the ginseng of setting emulation later
Number, emulates to obtain the Near-field Data of electronic circuit using electromagnetic field simulation software.
(2) obtain Near-field Data by test: " test " can utilize electromagnetic field test equipment in microwave dark room
It carries out, specific practice is as follows: the electronic circuit for needing to predict electromagnetic radiation being placed on testboard first, then in electronic circuit
The upper suitable excitation of addition is allowed to work normally, and obtains the near field of electronic circuit using near field probes and connecting test system later
Data.
Wherein, " equivalent source " described in step 2 refers to that magnetic dipole or electric dipole, choosing method are as follows: reason
By above saying, source is carried out using magnetic dipole and electric dipole to rebuild all to be feasible.When considering actual measurement problem, such as
Near-field test, usually measuring magnetic field can be than measurement electric field more more easily, and electric field probe would generally generate far field itself
Disturbance, leads to the deviation of measurement result, so usually choosing magnetic dipole as the equivalent source in the method for reconstructing of source.
Wherein, " establishing equivalent source model for different scenes " described in step 3, way is as follows: utilizing magnetic couple
Extremely the electromagnetic radiation formula of son or electric dipole derive and take into account the electromagnetic radiation environment of equivalent source；Such as
Ground can be divided since the effect that ground faces equivalent source is to cause the reflection of electromagnetic field using image theory
Analysis, the effect on ground is comprehensive in equivalent source electromagnetic radiation field；For enclosed environment, such as metal cavity, need metal
Cavity is considered as waveguide, and equivalent source is considered as waveguide excitation；
Wherein, " value of equivalent source is solved using inversion algorithm " described in step 4, the practice is as follows: in computer
In write suitable source algorithm for reconstructing, then by step 1 or Near-field Data and step 2 step 3 in it is selected etc.
It imitates source model to import in the algorithm for reconstructing of source, utilizes the value of computer solving equivalent source.Since source method for reconstructing is a kind of based on product
The method for dividing equation predicts that is taken when electromagnetic radiation is the implementation of discretization numerical value carrying out source method for reconstructing, therefore,
Inversion algorithm is substantially the process handled big numerical quantity, i.e. progress matrix operation.If known source is solved field
Regard positive as, then source method for reconstructing is substantially exactly the inversion process of matrix." inversion algorithm ", main includes most
Small square law, genetic algorithm etc..
Wherein, " prediction " described in step 5, its specific way are established using step 1 to step 4
Equivalent source simulates the far field electromagnetic radiation and near-field electromagnetic radiation of electronic system in electromagnetic field simulation software, and can determine
The power of equipment equivalent 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 to carry out electromagnetic compatibility analysis
Purpose solves the test request of electronic circuit electromagnetic radiation at this stage and at high cost, is not easy to carry out the reality of electromagnetic compatibility analysis
Border problem.
The present invention compared with prior art, have effects that following significant ground advantage and:
First, without measuring the far field electromagnetic radiation characteristic of electronic system: at this stage for the far field electromagnetic of electronic system
The test request and higher cost of radiation characteristic, not all mechanism all have test condition.The present invention only needs to emulate or survey
The near-field electromagnetic radiation characteristic of examination electronic system can establish equivalent source and release far field electromagnetic radiation characteristic.
Second, the EMC analysis in terms of electronic system electromagnetic radiation is provided a method: at present for electricity
There are in terms of certain difficulty, especially electromagnetic radiation for the analysis and improvement of subsystem electromagnetic compatibility.The present invention can predict electricity
The biggish region of electromagnetic radiation is generated in the electromagnetic radiation characteristic and electronic system of sub-circuit, to preferably carry out electromagnetic compatibility
It improves.
Detailed description of the invention
Fig. 1 is the method for the invention flow chart.
Specific embodiment
A kind of method using the prediction electronic circuit electromagnetic radiation of source method for reconstructing of the present invention, as shown in Figure 1, step is such as
Under:
Step 1: by emulating or testing acquisition Near-field Data；
(1) by emulation obtain Near-field Data: " emulation " using the electromagnetic field simulation softwares such as HFSS, FEKO into
Row, the specific practice for obtaining Near-field Data are as follows: establishing first in electromagnetic field simulation software and need to predict electromagnetic radiation
Then the model of electronic circuit adds suitable excitation Analogical Electronics on model and works normally, the ginseng of setting emulation later
Number, emulates to obtain the Near-field Data of electronic circuit using electromagnetic field simulation software.
(2) obtain Near-field Data by test: " test " can utilize electromagnetic field test equipment in microwave dark room
It carries out, the specific practice for obtaining Near-field Data is as follows: the electronic circuit for needing to predict electromagnetic radiation being placed on testboard first
On, suitable excitation is then added on electronic circuit and is allowed to work normally, and utilizes near field probes and connecting test system later
Obtain the Near-field Data of electronic circuit.
The key for obtaining Near-field Data is the accuracy of Near-field Data amplitude and phase.
Step 2: suitable equivalent source is chosen；
" equivalent source " refers to that magnetic dipole or electric dipole, choosing method are as follows: theoretically, using magnetic couple
Extremely son and electric dipole come carry out source rebuild all be feasible.When considering actual measurement problem, such as near-field test is usually surveyed
Measuring magnetic field can be than measurement electric field more more easily, and electric field probe would generally generate disturbance to far field itself, and measurement is caused to be tied
The deviation of fruit, so usually choosing magnetic dipole as the equivalent source in the method for reconstructing of source.
Step 3: equivalent source model is established for different scenes；
Described " the establishing equivalent source model for different scenes ", way is as follows: utilizing magnetic dipole or electric dipole
Electromagnetic radiation formula carry out derive and the electromagnetic radiation environment of equivalent source is taken into account；Such as ground, due to ground
Effect for equivalent source is to cause the reflection of electromagnetic field, therefore can be analyzed using image theory, by the effect on ground
Synthesis is in equivalent source electromagnetic radiation field；For enclosed environment, such as metal cavity, need metal cavity being considered as waveguide,
And equivalent source is considered as waveguide excitation；
Step 4: the value of equivalent source is solved using inversion algorithm；
Described " value of equivalent source is solved using inversion algorithm ", the practice is as follows: writing suitable source in a computer
Then equivalent source model selected in the Near-field Data obtained in step 1 and step 2 step 3 is imported source by algorithm for reconstructing
In algorithm for reconstructing, the value of computer solving equivalent source is utilized.Since source method for reconstructing is a kind of method based on integral equation,
Carry out source method for reconstructing predicts that is taken when electromagnetic radiation is the implementation of discretization numerical value, and therefore, inversion algorithm is substantially
It is the process handled big numerical quantity, i.e. progress matrix operation.If known source is solved to field regards positive as,
Source method for reconstructing is substantially exactly the inversion process of matrix.And the matrix not necessarily square matrix of actually source method for reconstructing generation,
Even square matrix, determinant may also be zero, and additionally, due to the truncated error of computer, carrying out matrix inversion can be led
The generation of error is caused, so the error of control inversion algorithm is also crucial, therefore to use control errors mode, such as regularization
Method, truncation SVD method, differential evolution method etc.." inversion algorithm " mainly includes least square method, genetic algorithm
Deng.
Step 5: the electromagnetic radiation of electronic circuit is predicted by the equivalent source that step 1 to step 4 is established.
" prediction ", its specific way are that the equivalent source established using step 1 to step 4 is imitated in electromagnetic field
The far field electromagnetic radiation and near-field electromagnetic radiation of electronic system are simulated in true software, and can determine equipment equivalent position everywhere
The power of electromagnetic radiation ability positions major electromagnetic radiation areas, and carries out electromagnetic compatibility improvement.
By above step, invention achieves prediction electronic circuit electromagnetic radiation to carry out electromagnetic compatibility analysis
Purpose solves the test request of electronic circuit electromagnetic radiation at this stage and at high cost, is not easy to carry out the reality of electromagnetic compatibility analysis
Border problem.
Claims (2)
1. a kind of method using the prediction electronic circuit electromagnetic radiation of source method for reconstructing, it is characterised in that: its specific implementation step
It is as follows: step 1: by emulating and testing acquisition Near-field Data:
(1) obtain Near-field Data by emulation: " emulation " is carried out using HFSS, FEKO electromagnetic field simulation software,
The specific practice for obtaining Near-field Data is as follows: the electronics electricity for needing to predict electromagnetic radiation is established first in electromagnetic field simulation software
Then the model on road adds suitable excitation Analogical Electronics on model and works normally, simulation parameter is arranged later, utilizes
Electromagnetic field simulation software emulates to obtain the Near-field Data of electronic circuit；
(2) obtain Near-field Data by test: " test " is to be carried out in microwave dark room using electromagnetic field test equipment,
Its specific practice for obtaining Near-field Data is as follows: the electronic circuit for needing to predict electromagnetic radiation being placed on testboard first, so
Suitable excitation is added on electronic circuit afterwards to be allowed to work normally, obtains electricity using near field probes and connecting test system later
The Near-field Data of sub-circuit；The key for obtaining Near-field Data is the accuracy of Near-field Data amplitude and phase；
Step 2: suitable equivalent source is chosen:
" equivalent source " refers to magnetic dipole, chooses magnetic dipole as the equivalent source in the method for reconstructing of source；
Step 3: equivalent source model is established for different scenes:
Derive and take into account the electromagnetic radiation environment of equivalent source using the electromagnetic radiation formula of magnetic dipole；For ground
It is analyzed using image theory, since the effect that ground faces equivalent source is to cause the reflection of electromagnetic field by ground in face
Effect it is comprehensive in equivalent source electromagnetic radiation field；For metal cavity enclosed environment, need metal cavity being considered as waveguide,
And equivalent source is considered as waveguide excitation；
Step 4: the value of equivalent source is solved using inversion algorithm:
Source algorithm for reconstructing is write in a computer, it then will be selected in the Near-field Data obtained in step 1 and step 2 step 3
The equivalent source model taken imports in the algorithm for reconstructing of source, utilizes the value of computer solving equivalent source；
Step 5: the electromagnetic radiation of electronic circuit is predicted by the equivalent source that step 1 to step 4 is established:
" prediction ", its specific way are that the equivalent source established using step 1 to step 4 is soft in electromagnetic-field simulation
The far field electromagnetic radiation and near-field electromagnetic radiation of electronic system are simulated in part, and determine the electromagnetic radiation everywhere of equipment equivalent position
The power of ability positions electromagnetic radiation region, and carries out electromagnetic compatibility improvement.
2. a kind of method using the prediction electronic circuit electromagnetic radiation of source method for reconstructing according to claim 1, feature
Be: " equivalent source " described in step 2 is electric dipole.
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| 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 |
| 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 |
| CN110108354B (en) * | 2019-06-03 | 2021-06-04 | 合肥工业大学 | Method for predicting vehicle passing noise in small-size semi-anechoic chamber |
| 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 |
| 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 |
| CN112577592B (en) * | 2020-11-27 | 2022-10-28 | 哈尔滨工程大学 | Finite space plane near-field acoustic holography measurement method based on space Fourier transform |
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