CN106055845A - Electromagnetic compatibility modeling method - Google Patents
Electromagnetic compatibility modeling method Download PDFInfo
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- CN106055845A CN106055845A CN201610529920.1A CN201610529920A CN106055845A CN 106055845 A CN106055845 A CN 106055845A CN 201610529920 A CN201610529920 A CN 201610529920A CN 106055845 A CN106055845 A CN 106055845A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/398—Design verification or optimisation, e.g. using design rule check [DRC], layout versus schematics [LVS] or finite element methods [FEM]
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Abstract
The invention belongs to the field of electromagnetic compatibility, mainly solves the problem of complexity of electromagnetic compatibility analysis modeling and designs a electromagnetic compatibility modeling method which is uniformly packaged and is connected with an outside world through ports. The method comprises the step of: carrying out a uniform description on an interference source, a transmission route and a sensor by use of a multi-port network, wherein the interference source, the transmission route and the sensor are regarded as black boxes; the black boxes are connected with the outside world through the ports; and any window which can enable a system to generate an electromagnetic energy relation with the outside world is defined as one port. Compared with a conventional electromagnetic compatibility modeling method, the method has the characteristics of consistency and easy combination. The electromagnetic compatibility modeling method is high in practicability, can be applied to electromagnetic compatibility analysis of different levels, and has good application prospects in the fields such as electromagnetic interference suppression, electromagnetic compatibility performance analysis and assessment, electromagnetic protection and the like.
Description
Technical field
The present invention relates to electromagnetic interference and EMC analysis method, particularly a kind of electromagnetic compatibility modeling method, can answer
In the Electro Magnetic Compatibility of the different stage such as system-level, device level, circuit board level is analyzed.
Background technology
Electromagnetic compatibility model is the mathematical description to electromagnetic interference mechanism and experimental analysis, is by EMC prediction and divides
The basis of analysis.According to electromagnetic interference theory of three elements, interference model is divided into interferer models, delivering path model and sensor mould
Type.
From level, electromagnetic compatibility analysis can be generally divided into system-level, device level and three levels of circuit board level, because of
Specific aim for each level object is relatively strong, and its analysis method and modeling method also have the most significantly to be distinguished.First level
It is the EMC prediction of plate level, needs to set up the electromagnetic behavior model of pcb board；Second level is that the electromagnetic compatibility of equipment is pre-
Survey, the such as EMC prediction of the electronic and electric components such as split conductor, driver itself, and the electromagnetism between equipment and equipment
Compatible prediction, needs to set up the model of multi-conductor transmission lines, linear and non-linear load；3rd level is system-level electromagnetism
Compatible prediction, carries out electromagnetism for such as aircraft, naval vessel, guided missile, airship etc. equipped with the system of Various Complex electronic electric equipment
Compatible prediction, needs to set up the spatial transmission model of the electromagnetic compatibility model of big system and electric wave.
Traditional electromagnetic compatibility model is it can be readily appreciated that but can not reflect the process that interference produces, propagates and formed comprehensively；
It addition, for the EMC analysis of different stage, its modeling method is varied, it is difficult to accomplish the highest versatility, unfavorable
Further development in electromagnetic compatibility technology.
Summary of the invention
In order to overcome the deficiency of existing electromagnetic compatibility modeling method, the present invention provides a kind of new electromagnetic compatibility modeling side
The concordance modeling method of method, referred to as electromagnetic compatibility.
The technical solution adopted in the present invention is, a kind of electromagnetic compatibility modeling method, it is characterised in that include walking as follows
Rapid:
These three elements of interference source, delivering path and sensitive equipment are packaged by the first step.
Traditional electromagnetic compatibility modeling method is to be modeled respectively by electromagnetic interference three elements, and this method multiport
Network carrys out the model of Unify legislation interference source, route of transmission and sensor.Interference source, delivering path and sensor are accordingly to be regarded as black
Box, this flight data recorder is contacted with extraneous by port.
Second step, determines the port of model after encapsulation.
Model after encapsulation is contacted with the external world by port.Any one can allow system, with extraneous, electromagnetic energy occurs
The window of magnitude relation is all defined as a port.The all of the port of model is all two-way, i.e. comprises input and output.Work as reality
Border system, when certain Single port is only possible to produce energy input or energy output, can deteriorate to one way ports.
Port not only comprises the input/output port of traditional signal, such as antenna, signaling interface, power interface
Deng；And comprise slit, the mutual approach of undesirable material wave transparent homenergic.
3rd step, sets up model.
Determine that the port type of model is exactly the output finding each port of model with the function expression of input and function ginseng
Number.According to the type of model entity, port type can be divided into circuit port, solenoid ports and Hybrid port three class.
The foundation of circuit model is mainly implemented according to the classification of circuit, and the theory of circuit modeling relatively becomes with method
Ripe.
Setting up of electromagnetic model is mainly the physical property according to electromagnetic field, by one group of differential equation or integral equation,
And determine according to boundary condition.The boundary value problem of electromagnetic field solves and has been summed up 3 kinds of methods: the first is analytic method,
The second is method of approximation, and the third is numerical method.
The foundation of mixed model needs the analysis method of combined circuit model and the analysis method of electromagnetic model.Mixed model
Can again be divided into circuit model and electromagnetic model two kinds of subelement model.
The present invention, compared with traditional electromagnetic compatibility modeling method, has concordance and the feature of easily combination.Can facilitate
Ground introduces the achievement in research of EMC prediction, the EMC analysis requirement of reply different stage, reaches to use a kind of modeling
Method just can meet the purpose of the EMC analysis demand of different stage.The present invention has the strongest practical value, it is possible to
It is applied in the middle of the EMC analysis of different stage, at electromagnetic interference suppression, Electro Magnetic Compatibility analysis and evaluation, electromagnetic protection
Have a good application prospect in field.
Accompanying drawing explanation
Fig. 1 is electromagnetic compatibility concordance modeling method schematic diagram；
Fig. 2 is shelter schematic diagram；
Fig. 3 is the electromagnetic compatibility concordance modeling of shelter；
Fig. 4 is the topological relation of model；
Fig. 5 is the basic structure of radar system front end；
Fig. 6 is the electromagnetic compatibility concordance modeling of radar system front end.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the present invention are described in detail.
The first step, packaging model.
Fig. 1 is the schematic diagram of electromagnetic compatibility concordance modeling method, wherein p1～pNFor port.Bidirectional port is used to retouch
Equipment of stating can accurately reflect system with extraneous energy exchange window and influence each other with extraneous.In real system, preferably
Input port and output port are non-existent, so-called preferably input (output) port, refer to that energy only can be (interior from outside
Portion) it is transferred to inside (outside), port is defined as unidirectional, takes to simplify by the most traditional method mostly
Approximation.But this approximation is likely to result in the important electromagnetic interference origin cause of formation and is left in the basket.
Second step, determines the port of model after encapsulation.
The output of arbitrary port is the function of all of the port input, and this relation is described by following equations group:
In formula, ptiRepresent the output of i-th port；
priRepresent the input of i-th port.
Relation between port is not limited to one-one relationship.The input of port can be that the output of other multiple model ports adds
Power summation；The output of port also has to input to produce on the port of other multiple models to be affected.
Relation between port can be written as matrix form
[P]=[Γ] [P] (2)
In formula, [P] is the vector of all of the port composition；
[Γ] is the transmission relation between port, and for incoherent port, element corresponding in [Γ] is 0.
Electromagnetic compatibility concordance modeling method is illustrated with a vehicle mounted square cabin.
Fig. 2 is shelter schematic diagram.It is divided into two separations, cabin 1 has computation compartment, have two to do the electricity that data process
Brain；For having the receiver receiving rack protection, cabin external antenna in cabin 2.Receiver data are connected in computer by data wire.
Carry out electromagnetic compatibility concordance modeling as shown in Figure 3.In figure, dotted line is the reciprocal action relation between port.Port
pi,j,kCoding rule be: i: model hierarchy；J: same level pattern number；K: same model port numbering.
According to model Level building topological relation as shown in Figure 4, if carrying out EMC analysis between system, it is of concern that
Shelter and the energy exchange problem of space outerpace, the most only need to extract shelter model；If carrying out device level EMC analysis, then need
Extract the level Four model at PC place；If carrying out circuit-level EMC analysis, then need to carry out deeper into, in more detail, more bottom
Electromagnetic compatibility concordance modeling.
Actual carry out EMC analysis time, it should in line with the principle of " ascending ", from the end of required problem analysis
Layer proceeds by the modeling of electromagnetic compatibility concordance.
EMC analysis unified modeling method has the property that
(1) concordance
A part for interference key element or interference key element is considered as an independent unit, and unit passes through with extraneous contact
Port realizes, and this unit is exactly a model entity, and the behavior of model is described by the transfer function between unit port.Therefore
No matter being interference source, it is real that interference delivering path or sensitive equipment or the part in them all may be defined as a model
Body, the model that the unit that so varies is corresponding is respectively provided with identical structure, and this gives and analyzes, calculates and work out computer and imitate
Proper program all can bring great convenience.
(2) associativity
It is prone to combination between model, facilitates classification.After using electromagnetic compatibility concordance modeling method descriptive system, Mei Gemo
The structure of type is all identical, but residing level can be different, utilizes the model unit of bottom to be conveniently combined into
The unit of a high level.
Between model entity, associated port directly docks, and remaining port is as the parameter of high-level unit port；
High level elements port is then their weighted array.
(3) independence
Vertically independent property: model entity is only associated with the model entity of higher order and low single order, for difference second order with
On model entity between there is not directly contact.It is vertically independent.
Laterally independence: there is not directly contact between the same level model entity of the same high-level unit of subordinate,
It is the most independent.
The characteristic of electromagnetic compatibility concordance modeling is described as a example by typical radar system front end.The base of radar system front end
This structure is represented by Fig. 5, is modeled radar system front end.Three grades of models (underlying model) are intermediate frequency amplifier, intermediate frequency filter
Ripple device, down-conversion mixer, low-noise amplifier, radio-frequency filter, local oscillator 1, local oscillator 2, up-conversion mixer, wave filter, merit
Rate amplifier, transmit-receive switch, antenna；Second-level model is antenna, transmit-receive switch, transmitting and receiving circuit；First-order model (top
Layer model) it is radar front end.
Fig. 6 show the electromagnetic compatibility concordance modeling of radar system front end.
The embodiment of model consistency: because being only concerned the electromagnetic property of modeling target, so the structure of three grades of models is actual
On be identical, its electromagnetic property is described by port.
The embodiment of model associativity: wherein three grades of model intermediate frequency amplifiers, intermediate-frequency filter, down-conversion mixers, low noises
Acoustic amplifier, radio-frequency filter, local oscillator 1 form second-level model and receive circuit；Three grades of model local oscillators 2, up-conversion mixer, filtering
Device, power amplifier composition second-level model radiating circuit；And second-level model antenna, transmit-receive switch, transmitting and receiving circuit
It is combined into complete radar system front end.The wherein input port P of up-conversion mixer1By radiating circuit, become radar
The signal input end of intermediate frequency mouth of front end；The input port P of intermediate frequency amplifier3By receiving circuit, become the intermediate frequency of radar front end
Signal output port；The transmitting-receiving port of antenna is docked to radar front end, becomes the air electromagnetic signals port of whole radar system.
The embodiment of the vertically independent property of model: the electromagnetic property of radar front end is embodied by four second-level model, and three grades of models,
Such as up-conversion mixer, it is impossible to directly the electromagnetic property of radar front end is produced impact.Although before physical significance, radar
The intermediate-freuqncy signal input of end is realized by up-converting filter, but goes out from the logic of modeling and the convenience of follow-up analysis
Sending out, it is rational for being arranged such.
The embodiment of the horizontal independence of model: to be subordinated to receive the low-noise amplifier of circuit and be subordinated to radiating circuit
Explanation as a example by power amplifier.Because the two has different membership relation, so there is not directly contact between them.From reality
Circuit sets out, and the signal demand that power amplifier produces, through receiving switch, produces energy leakage, is then passed through radio-frequency filter
Low-noise amplifier can be arrived.So the setting of the horizontal independence of model is the physical significance meeting modeling target.
Claims (9)
1. an electromagnetic compatibility modeling method, it is characterised in that comprise the steps:
These three elements of interference source, delivering path and sensitive equipment are packaged, carry out Unify legislation with multiport network by the first step
The model of interference source, route of transmission and sensor, is accordingly to be regarded as flight data recorder by interference source, delivering path and sensor, this flight data recorder
By port with extraneous contact；
Second step, determines the port of model after encapsulation, and the model after encapsulation is contacted with the external world by port；
3rd step, determines the port type of model, finds the output of each port of model to join with function expression and the function of input
Number, sets up model.
2. electromagnetic compatibility modeling method as claimed in claim 1, is characterised by, described port is sent out with extraneous for allowing system
The window of raw electromagnetic energy relation, all of the port of model is all two-way, i.e. comprises input and output, when real system is at certain
When Single port is only possible to produce energy input or energy output, one way ports can be deteriorated to.
3. electromagnetic compatibility modeling method as claimed in claim 2, it is characterised in that described port include antenna, signaling interface,
Power interface, also comprises slit, undesirable material wave transparent energetic interaction approach.
4. electromagnetic compatibility modeling method as claimed in claim 1, it is characterised in that described port type is divided into circuit port,
Solenoid ports and Hybrid port three class.
5. electromagnetic compatibility modeling method as claimed in claim 1, it is characterised in that described model is divided into circuit model, electromagnetism
Model and mixing model three class.
6. electromagnetic compatibility modeling method as claimed in claim 5, it is characterised in that the foundation of described circuit model is according to circuit
Classification implement.
7. electromagnetic compatibility modeling method as claimed in claim 5, it is characterised in that the foundation of described electromagnetic model is according to electricity
The physical property in magnetic field, by one group of differential equation or integral equation, and determines according to boundary condition.
8. electromagnetic compatibility modeling method as claimed in claim 7, it is characterised in that the boundary value side of solving of described boundary condition
Method is analytic method, or method of approximation, or numerical method.
9. electromagnetic compatibility modeling method as claimed in claim 5, it is characterised in that the foundation of described mixed model needs to combine
The analysis method of circuit model and the analysis method of electromagnetic model, be divided into circuit model and the two kinds of son of electromagnetic model is single
Meta-model.
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| CN106547992A (en) * | 2016-11-25 | 2017-03-29 | 郑州云海信息技术有限公司 | A kind of method for designing for improving system-level electromagnetic interference simulation efficiency |
| CN112433121A (en) * | 2020-11-19 | 2021-03-02 | 湖南大学 | Electromagnetic topology-based active phased array antenna electromagnetic compatibility analysis method |
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