CN106407576A - An extracting method and system for electromagnetic radiation characteristic parameters of apparatuses - Google Patents
An extracting method and system for electromagnetic radiation characteristic parameters of apparatuses Download PDFInfo
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- CN106407576A CN106407576A CN201610848791.2A CN201610848791A CN106407576A CN 106407576 A CN106407576 A CN 106407576A CN 201610848791 A CN201610848791 A CN 201610848791A CN 106407576 A CN106407576 A CN 106407576A
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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
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The embodiments of the invention provide an extracting method and system for electromagnetic radiation characteristic parameters of apparatuses and belong to the technical field of electromagnetic compatibility. The method comprises the steps of determining an electromagnetic interference source of an apparatus; calculating a current of an equivalent circuit of a common mode current circuit of the electromagnetic interference source based on the Kirchhoff laws to obtain a common mode interference current of the electromagnetic interference source; placing an equivalent model obtained through equivalent treatment of the common mode interference current into a three-dimensional model of the apparatus to obtain a target apparatus model; performing three-dimensional electromagnetic simulation on the target apparatus model to obtain a three-dimensional electromagnetic simulation result, wherein an excitation source of the three-dimensional electromagnetic simulation is the common mode interference current; extracting the electromagnetic radiation characteristic parameters of the apparatus from the three-dimensional electromagnetic simulation result. The method and the system solve the problem that only the physical properties of systems and apparatuses in airplanes are analyzed and no analysis for electromagnetic radiation characteristics is performed in the prior art, and realize the analysis of electromagnetic radiation characteristics in airplanes and extracting of the electromagnetic radiation characteristic parameters.
Description
Technical field
The embodiment of the present invention belongs to technical field of electromagnetic compatibility and in particular to the carrying of a kind of installation electromagnetical Radiation Characteristics Parameters
Take method and system.
Background technology
Aircraft electromagnetic compatibility be research aircraft under the conditions of limited space, time and frequency spectrum resource, various electrical equipments
Can coexist, and the unlikely a science causing degradation.According to GB/T4765-1995《Electromagnetic compatibility term》In, simultaneous to electromagnetism
Hold (Electro Magnetic Compatibility, EMC) definition be：Equipment or system can be normal in its electromagnetic environment
Work and the not ability to the electromagnetic disturbance that this environment structure can not bear.
Performance with aircraft is constantly lifted, and the value volume and range of product of the airborne electronic equipment electrical equipment of aircraft itself is increasingly
Many, especially accurate sensitivity kind equipment gets more and more, and performance is also more much more advanced, and equipment installs more and more intensive, electric power
Increasing, it is further serious that this allows for interfering of aircraft electrical electronic system and equipment.
At present, China is to the equipment of interior of aircraft or system, from the foundation of mathematical model to system dynamically the imitating of part
True and design, has all done substantial amounts of research.But, these are studied all just for its physical property, not to electromagnetic radiation
Characteristic is studied, and interior of aircraft equipment or system be due to complex structure, if being directly analyzed and extracting electromagnetic radiation
Characterisitic parameter is so that analysis and extraction process will be sufficiently complex, and leads to simulation time long, calculates memory pressure greatly, makes
The extraction rate obtaining aircraft electromagnetic radiation characteristic parameter is low.Therefore, set up simplified model, extract electromagnetic radiation characteristic parameter tool
Significant.
Content of the invention
The purpose of the embodiment of the present invention is to provide one kind by determining electromagnetic interference source and obtaining its common-mode interference current, right
The radiated electric field of common-mode interference current carries out equivalent, places into device model and carries out 3 D electromagnetic emulation, and imitates from 3 D electromagnetic
The method and system of aircraft electromagnetic radiation characteristic parameter is extracted in true result.
According to embodiments of the present invention on one side, provide a kind of extracting method of installation electromagnetical Radiation Characteristics Parameters, described
Method includes：Determine the electromagnetic interference source of equipment；Calculate the common mode current electricity of described electromagnetic interference source based on Kirchhoff's theorem
The electric current of the equivalent circuit on road, obtains the common-mode interference current of described electromagnetic interference source；After equivalent for described common-mode interference current
The equivalent model obtaining is put in the threedimensional model of equipment, obtains target device model；Target device model is carried out with three-dimensional electricity
Magnetic emulates, and obtains 3 D electromagnetic simulation result；The driving source of described 3 D electromagnetic emulation is described common-mode interference current；From described
The described electromagnetic radiation characteristic parameter of extraction equipment in 3 D electromagnetic simulation result.
Wherein, the described step determining electromagnetic interference source includes：Judge in described equipment whether there is have transient current or
The part of instantaneous voltage；When there are the part of described transient current or described instantaneous voltage, there will be described transient current
Or the part of described instantaneous voltage is as electromagnetic interference source.
Wherein, the described circuit to described electromagnetic interference source carries out step response calculating, obtains described electromagnetic interference source
The step of common-mode interference current includes：Based on the circuit structure of described electromagnetic interference source, obtain common mode current circuit；To described common
Mould current circuit carries out circuit simulation, obtains artificial circuit；Described artificial circuit is carried out equivalent, obtain equivalent circuit；It is based on
Kirchhoff's theorem calculates the electric current of equivalent circuit, obtains the common-mode interference current of described electromagnetic interference source.
Wherein, described will be equivalent for described common-mode interference current after the equivalent model that obtains put in device model, obtain mesh
The step of marking device model includes：Carried out using the radiated electric field of common-mode interference current described in antenna pair equivalent, obtain antenna etc.
Effect model；Described antenna equivalent model is put in device model, as target device model.
Wherein, 3 D electromagnetic emulation is carried out to target device model, the step obtaining 3 D electromagnetic simulation result includes：Adopt
With time domain transmission line matrix method, time-domain-simulation is carried out to device model, obtain 3 D electromagnetic simulation result；Wherein, boundary condition
For open free boundary, simulation frequency is 0-150MHZ.
Other side according to embodiments of the present invention, provides a kind of extraction system of installation electromagnetical Radiation Characteristics Parameters,
Described system includes：Determining module, for determining the electromagnetic interference source of equipment；Computing module, for based on Kirchhoff's theorem
Calculate the electric current of the equivalent circuit of the common mode current circuit to described electromagnetic interference source, the common mode obtaining described electromagnetic interference source is done
Disturb electric current；Object module acquisition module, the equivalent model for obtaining after will be equivalent for described common-mode interference current puts into equipment
In threedimensional model, obtain target device model；Emulation module, for carrying out 3 D electromagnetic emulation to target device model, obtains
3 D electromagnetic simulation result；The driving source of described 3 D electromagnetic emulation is described common-mode interference current；Extraction module, for from institute
State the described electromagnetic radiation characteristic parameter of extraction equipment in 3 D electromagnetic simulation result.
Wherein, described determining module includes：Judging submodule, has transient current for judging to whether there is in described equipment
Or the part of instantaneous voltage；Interference source determining module, there are described transient current or the part of described instantaneous voltage for working as
When, the part that there will be described transient current or described instantaneous voltage is as electromagnetic interference source.
Wherein, described computing module includes：Common-mode circuit acquisition submodule, for the circuit based on described electromagnetic interference source
Structure, obtains common mode current circuit；Emulation submodule, for carrying out circuit simulation to described common mode current circuit, is emulated
Circuit；First equivalent submodule, equivalent for carrying out to described artificial circuit, obtain equivalent circuit；Calculating sub module, for base
Calculate the electric current of equivalent circuit in Kirchhoff's theorem, obtain the common-mode interference current of described electromagnetic interference source.
Wherein, described whole machine model acquisition module includes：Second equivalent submodule, for being done using common mode described in antenna pair
The radiated electric field disturbing electric current carries out equivalent, obtains antenna equivalent model；Put into submodule, for putting described antenna equivalent model
Enter in device model, as target device model.
Wherein, described emulation module is electromagnetic simulation software CST, the time-domain transmission wire matrix method in CST simulation software
Time-domain-simulation is carried out to device model, obtains 3 D electromagnetic simulation result；Wherein, boundary condition is open free boundary, emulation
Frequency is 0-150MHZ.
Embodiment of the present invention is the electromagnetic interference source by determining equipment, then calculates the common mode disturbances of electromagnetic interference source
Electric current, carries out equivalent to the radiated electric field of common-mode interference current, will be equivalent after the equivalent model that obtains put into the three-dimensional mould of equipment
Type, forms target device model, and then carries out 3 D electromagnetic emulation to target device model, using common-mode interference current as three-dimensional
The driving source of Electromagnetic Simulation, extracts aircraft electromagnetic radiation characteristic parameter from 3 D electromagnetic simulation result.Thus solving existing
In technology, the physical property just for equipment is analyzed, and the analysis to electromagnetic radiation characteristic is not it is achieved that in equipment
The analysis of portion's electromagnetic radiation characteristic and the acquisition of electromagnetic radiation characteristic parameter.On the other hand, due to using equivalent model to electromagnetism
The common mode radiation electric field of interference source carry out equivalent, and using common-mode interference current as final emulation driving source so that whole
Final phantom simplifies, thus the pressure decreasing simulation time and calculating internal memory, improves electromagnetic radiation characteristic parameter
Acquisition speed.
Brief description
Fig. 1 is a kind of schematic flow sheet of the extracting method of embodiment of the present invention installation electromagnetical Radiation Characteristics Parameters；
Fig. 2 is the schematic flow sheet of step S101 in the embodiment of the present invention；
Fig. 3 is the structural representation of Boeing B787 aircraft electricity environmental control system in the embodiment of the present invention；
Fig. 4 is the schematic flow sheet of step S102 in the embodiment of the present invention；
Fig. 5 is the common-mode interference current circuit diagram of three-phase pulse width modulated inverter in the embodiment of the present invention；
Fig. 6 is the circuit diagram of BUCK changer；
Fig. 7 is the equivalent circuit diagram of the BUCK changer of Fig. 6；
Fig. 8 is the circuit diagram of three-phase pulse width modulated inverter equivalent circuit in the embodiment of the present invention；
Fig. 9 is the simplified electrical circuit diagram of three-phase pulse width modulated inverter equivalent circuit in the embodiment of the present invention；
Figure 10 is the schematic flow sheet of step S103 in the embodiment of the present invention；
Figure 11 is the equivalent circuit diagram of antenna equivalent model in the embodiment of the present invention；
Figure 12 is that in the embodiment of the present invention, target device model is the threedimensional model schematic diagram of aircraft；
Figure 13 is a kind of structural representation of the extraction system of installation electromagnetical Radiation Characteristics Parameters in the embodiment of the present invention；
Figure 14 is the structural representation of determining module in the embodiment of the present invention；
Figure 15 is the structural representation of computing module in the embodiment of the present invention；
Figure 16 is the structural representation of whole machine model acquisition module in the embodiment of the present invention.
Specific embodiment
For making the object, technical solutions and advantages of the present invention of greater clarity, with reference to specific embodiment and join
According to accompanying drawing, the present invention is described in more detail.It should be understood that these descriptions are simply exemplary, and it is not intended to limit this
Bright scope.Additionally, in the following description, eliminate the description to known features and technology, to avoid unnecessarily obscuring this
The concept of invention.
Electromagnetic interference is divided into Conduction Interference and two kinds of radiation interference, and Conduction Interference refers to by conducting medium an electrical network
Signal on network is coupled to another electric network.Radiation interference refers to that interference source is coupled to another electricity by space its signal
Network.The embodiment of the present invention is mainly analyzed to radiation interference, for example：In high-speed printed circuit board and system design, high
Frequency holding wire, the pin of integrated circuit, all kinds of connector etc. all may referred to as have the radiation interference source of antenna performance, can launch
Electromagnetic wave simultaneously affects in other systems or the system the normal work of other subsystems.Therefore, this kind of system is normally used as electricity
Magnetic disturbance source.
The electromagnetic interference energy of electromagnetic interference source transmitting is propagated, to affect other electricity consumptions in the way of conducting or radiating
The normal work of equipment.The embodiment of the present invention is that equipment is analyzed, and determines electromagnetic interference source, and calculates common mode disturbances electricity
Stream, the driving source that common-mode interference current is emulated as 3 D electromagnetic, 3 D electromagnetic emulation is carried out to the threedimensional model of equipment, from
And the radiated electric field of simulator electromagnetic interference source and radiation current, from simulation result extract electromagnetic radiation characteristic parameter with
The electromagnetic radiation characteristic of solution equipment.
Fig. 1 shows a kind of schematic flow sheet of the extracting method of embodiment of the present invention installation electromagnetical Radiation Characteristics Parameters.
As shown in figure 1, the method includes：
S101, determines the electromagnetic interference source of equipment；
Power electronic equipment at work, can send strong electromagnetic interference, and this interference mostlys come from semiconductor switch
Device, semiconductor switch device during turning on and off, because voltage and current occurs saltus step at short notice, thus shape
Become electromagnetic interference.For example：For the electric environmental control system of aircraft, electromagnetic interference source is mainly three-phase pulse width modulated inverter.Electricity
Environmental control system, refers to the environmental control system as power using electric energy, and wherein, environmental control system is also known as passenger cabin air-conditioning system
System.
As shown in Fig. 2 step S101 determines that the electromagnetic interference source of equipment includes：
S201, whether there is in judgement equipment has the part of transient current or instantaneous voltage；
In a device, using high-speed semiconductor switching device, such as insulated gate bipolar transistor (IGBT), metal-oxide
Thing semiconductor field effect transistor (MOSFET) etc., can greatly speed up the dynamic response process of equipment.However, these quasiconductors
Switch high-frequency pulse signal there is very big instantaneous voltage dv/dt or very big transient current di/dt, can in equipment its
Its part forms very strong electromagnetic interference.Therefore it may only be necessary to whether there is in judgement equipment there is instantaneous voltage or transient current
Part is it is possible to whether there is electromagnetic interference source in understanding equipment.
S202, when there are the part of transient current or instantaneous voltage, there will be the portion of transient current or instantaneous voltage
Part is as the electromagnetic interference source of equipment.
For example：When the electric environmental control system to aircraft is analyzed, inverter is that the major electromagnetic in electric environmental control system is done
Disturb source.As shown in figure 3, the electric environmental control system structure for Boeing B787 aircraft.Motor is carried out by electric machine controller by alternating current
Drive.The frequency converter timing that motor is used is electric machine speed regulation mode general at present, and the converter in electric environmental control system is realized
The change of " AC-DC-exchange ", converter is combining of commutator and inverter.Pulse-width modulated inverter refers to should
With the inverter of PWM technology, hereinafter referred to as PWM inverter, PWM inverter is in electric machine controller (Fig. 3 is not shown).Cause
This, as long as when PWM inverter works in switching mode and does at a high speed switching, substantial amounts of coupling interference produces therewith, to being
In system, other electronic equipments produce electromagnetic interference.Therefore, in the electric environmental control system of aircraft, PWM inverter is electric environmental control system
Electromagnetic interference source.
Electromagnetic interference can be produced to miscellaneous equipment in electric environmental control system, specially during PWM inverter work：PWM inverter
Coupled interference is produced, its iron loss of motor driving and copper loss become many, first pass through wire and be transmitted on power supply, then during work
Again miscellaneous equipment in electric environmental control system is conducted to by distribution network, the electronic equipment to surrounding and cable produce electromagnetic interference,
Thus affecting other electric equipment normal works.
S102, is calculated the electric current of the equivalent circuit of the common mode current circuit of electromagnetic interference source, obtains based on Kirchhoff's theorem
Common-mode interference current to electromagnetic interference source；
As shown in figure 4, step S102 includes following sub-step：
S401, based on the circuit structure of electromagnetic interference source, obtains common-mode interference current circuit；
Due to there is switching device in the circuit structure of electromagnetic interference source, therefore, common-mode interference current may be considered out
Closing device leads to the instantaneous voltage of output voltage change generation and the parasitic capacitance of circuit output side to combine generation, common mode disturbances
Electric current mutually flows in input and reference ground between.For example：For PWM inverter, common-mode interference current is by inversion respectively
The speed-sensitive switch that each brachium pontis of device is located leads to the instantaneous voltage of output voltage change generation and the parasitic capacitance connection of system outlet side
Close generation.
S402, carries out circuit simulation to common-mode interference current circuit, obtains artificial circuit；
As a kind of embodiment, can be to be emulated using circuit simulating software.Preferably, soft using current simulations
Part Saber emulates to common-mode interference current circuit.
S403, carries out to artificial circuit equivalent, obtains equivalent circuit；
As a kind of embodiment, the principle of equal effects that can adopt decompression transducer (i.e. BUCK changer) circuit is to imitative
True circuit carries out equivalent.It is single switching transistor due to comprise in BUCK converter circuit, therefore, no matter being for Single switch pipe
Or the electromagnetic interference source of multiple switch pipe, can adopt the principle of equal effects of the common-mode interference current of BUCK converter circuit
Obtain the equivalent circuit of electromagnetic interference source.
Fig. 6 is the circuit diagram of BUCK changer, because switch transistor T has parasitic capacitance C over the groundp, when switch transistor T break-make,
The P point of BUCK changer ceaselessly changes to the current potential of reference ground, and the current potential of this change is to parasitic capacitance CpFilled
Electric discharge, causes common-mode interference current, common-mode interference current flows through parasitic capacitance Cp, it is then passed through radiator and reach reference ground, then
DC side is returned to by 50 Ω resistance of LISN network and the DC capacitor of 0.25 μ F, divide into two-way electric current I1And I2.Wherein,
I1The colelctor electrode of switching tube is directly returned to by the connecting line of dc bus positive pole, and I2Then pass through the negative pole of dc bus through electricity
The colelctor electrode of switching tube, this two electric current I are returned to after solution electric capacity1And I2Difference be I2Pass through the electrolysis on dc bus
Electric capacity.Electrochemical capacitor has certain equivalent series inductance and equivalent series resistance it is assumed that its equivalent series inductance is Le, equivalent
Series resistance be Re, and the order of magnitude of Le be generally nH level, Re be generally 0.1 Ω about it is assumed that leading in common mode current loop
The stray inductance of line is Lp, and the order of magnitude of Lp is generally μ H level it is clear that inductance Le is much smaller than inductance Lp, and resistance Re is much smaller than 50
Ω.The impact of the therefore equivalent series resistance of electrochemical capacitor and equivalent series inductance generally can be ignored, I1And I2The path flowing through
It is exactly the same, and I1And I2Half for common mode current Icm.
Fig. 7 is the equivalent circuit diagram of the BUCK changer of Fig. 6.In Fig. 7, Lcab represents LISN network to the direct current of 0.25 μ F
The equivalent inductance of electric capacity, RinRepresent the equivalent resistance of the DC capacitor to 0.25 μ F for the LISN network.CnIt is electrochemical capacitor (in Fig. 6
Illustrate) after the equivalent parasitic capacitances to reference ground for the dc bus both positive and negative polarity, CpRepresent the parasitism that common-mode interference current flows through
Electric capacity, LcmRepresent the equivalent inductance of radiator and the connecting line of reference ground, V is the voltage at switch transistor T two ends.
For include Multi- Switch pipe electromagnetic interference source for, its passive device be equivalent to BUCK changer equivalent circuit
Equally, voltage source V1+V2+ ... the V of its equivalent circuitnRepresent, n is the quantity of the circuitry phase of electromagnetic interference source.
For example：In three-phase PWM inverter, the equivalent circuit of other passive devices is as BUCK changer equivalent circuit, its
Voltage source is by V1+V2+V3To replace.
S404, is calculated the electric current of equivalent circuit, obtains the common mode disturbances of electromagnetic interference source based on Kirchoff s voltage theorem
Electric current.
In embodiments of the present invention, for the electromagnetic interference source circuit structure of only single switching transistor, obtaining
After effect circuit, using the Dai Weinan principle of equal effects, equivalent circuit can be simplified, be simplified circuit, the equivalent electric after simplification
Road is a Second-Order RLC Filter Circuit equivalent circuit, and then according to Kirchoff s voltage theorem to Second-Order RLC Filter Circuit equivalent circuit row kirchhoff electricity
Pressure equation, thus being calculated the current expression simplifying circuit, that is, obtains the expression of the common-mode interference current of electromagnetic interference source
Formula.For the circuit structure of the electromagnetic interference source of multiple switch pipe, can be using the electromagnetic interference for single switching transistor
Source asks the method for common-mode interference current to ask for the common-mode interference current of multiple switch pipe.
Below by citing, above-mentioned steps S401- step S404 is illustrated：
As shown in figure 5, during the turn-on and turn-off of each switching tube of three-phase PWM pulse width modulation inverter, due to
Three-phase pulse width modulated inverter is ceaselessly in the working condition of on an off, leads to the port voltage of three phase A phases, B phase and C phase
Va、VbAnd VcConstantly there is saltus step, and in circuit, between circuit and ground, also can form parasitic capacitance C respectivelyp1、Cp2、Cp3, end
Mouth voltage Va、VbAnd VcBy parasitic capacitance Cp1、Cp2、Cp3Constantly charge and discharge process, lead to common-mode interference current
icm1、icm2And icm3Generation, common-mode interference current reaches three-phase PWM inverter along line impedance stabilization net work (LISN)
On dc bus, mutual sensitized is produced to electrical network or miscellaneous equipment.
During the common-mode interference current of calculating three-phase PWM inverter, can be A, B, C three-phase brachium pontis of three-phase PWM inverter
Separate to analyze., the common-mode interference current that it produces can adopt the side of Buck changer equivalent analysis taking A phase brachium pontis as a example
Method, the switch transistor T in A phase brachium pontis1The voltage at two ends voltage source V1Equivalent, the common-mode interference current of B phase brachium pontis and C phase brachium pontis
The method that Buck changer equivalent analysis can also be adopted, by switch transistor T3And T5The voltage at two ends uses voltage source V respectively2And V3
Replace.Being total to of the common-mode interference current sum that A phase, B phase and three brachium pontis of C phase produce, as three-phase PWM pulse width modulation inverter
Mould interference electric current.For each brachium pontis in A phase, B phase and three brachium pontis of C phase, its physical characteristic is all the same, is all by exhausted
Edge grid bipolar transistor (IGBT, Insulated Gate Bipolar Transistor) forms, therefore, in each brachium pontis
Point parasitic capacitance size over the ground is all identical, the conversion of the equivalent circuit of other passive devices in three-phase PWM inverter, with
In Buck translation circuit, passive device is equivalent the same.The equivalent circuit of the common-mode interference current of PWM inverter is as shown in Figure 8.
In Fig. 8, V1+V2+V3Represent the equivalent voltage sum of A, B, C phase of three-phase PWM inverter, 0.5uF represents three-phase PWM inverter
LISN network DC capacitor, 25 Europe represent the D.C. resistance of the LISN network of three-phase PWM inverter；LcabRepresent LISN net
Network is to the equivalent inductance of DC capacitor, RinRepresent the equivalent resistance from LISN network to DC capacitor.CnAfter being electrochemical capacitor
The equivalent parasitic capacitances to reference ground for the dc bus both positive and negative polarity, CpIt is the equivalent parasitic electricity to reference ground for the switching tube emitter stage
Hold；LcmRepresent the equivalent inductance of radiator and the connecting line of reference ground.
Then utilize the Dai Weinan principle of equal effects, the equivalent circuit shown in Fig. 8 is simplified, obtains letter as shown in Figure 9
Change circuit, in figure, E represents the voltage source of equivalent circuit, and R represents 25 Europe and RinEquivalent resistance, L representsTo such as
Simplification circuit shown in Fig. 9 seeks the current expression of zero state step response, obtains the common-mode interference current of three-phase PWM inverter
The expression formula of i (t) is：
In formula, i (t) is the common-mode interference current of three-phase PWM inverter, and A is current symbol.
S103, equivalent model common-mode interference current being carried out obtain after antenna is equivalent is put into the threedimensional model of equipment
In, obtain target device model；Wherein, when target device is aircraft, its threedimensional model is as shown in Figure 9.
Preferably, using the equivalent common-mode interference current of antenna, obtain equivalent model, and then equivalent model is put into equipment
In threedimensional model, obtain target device model.For example：Using the common-mode interference current of the equivalent three-phase PWM inverter of antenna, obtain
Equivalent model, and then equivalent model is put in the three-dimensional complete machine model of aircraft.
As shown in Figure 10, step S103 includes：
S1031, is carried out to the radiated electric field of common-mode interference current using short monopole antenna equivalent, obtains the equivalent mould of antenna
Type；Antenna equivalent model is as shown in figure 11.
S1032, antenna equivalent model is put in device model, as target device model.As a kind of embodiment,
When equipment is for aircraft, target device model is as shown in figure 12.
S104, carries out 3 D electromagnetic emulation to target device model, obtains 3 D electromagnetic phantom；Wherein, three-dimensional electricity
The driving source of magnetic emulation is common-mode interference current；
Preferably, 3 D electromagnetic emulation is carried out to target device model using CST 3 D electromagnetic simulation software.Step S104
Including：
Time-domain-simulation is carried out to device model using time-domain transmission wire matrix method, obtains 3 D electromagnetic simulation result；Its
In, boundary condition is open free boundary, and simulation frequency is 0-150MHZ, and simulation time is 10 μ s.
S105, extraction equipment electromagnetic radiation characteristic parameter from 3 D electromagnetic simulation result.
After the threedimensional model to equipment carries out 3 D electromagnetic emulation, obtain 3 D electromagnetic simulation result, then can be therefrom
The electromagnetic radiation characteristic parameter of extraction equipment.
As shown in figure 13, a kind of extraction system of installation electromagnetical Radiation Characteristics Parameters, system includes：
Determining module 11, for determining the electromagnetic interference source of equipment；
Computing module 12, for calculating the electric current of the equivalent circuit of the common mode current circuit to electromagnetic interference source based on KVL,
Obtain the common-mode interference current of electromagnetic interference source；
Object module acquisition module 13, the equivalent model for obtaining common-mode interference current after equivalent puts into the three of equipment
In dimension module, obtain target device model；
Emulation module 14, for carrying out 3 D electromagnetic emulation to target device model, obtains 3 D electromagnetic simulation result；Three
The driving source of dimension Electromagnetic Simulation is common-mode interference current；
Extraction module 15, for the electromagnetic radiation characteristic parameter of extraction equipment from 3 D electromagnetic simulation result.
As shown in figure 14, determining module 11 includes：
Judging submodule 110, has the part of transient current or instantaneous voltage for whether there is in judgement equipment；
Interference source determination sub-module 111, instantaneous for when there are the part of transient current or instantaneous voltage, there will be
The part of electric current or instantaneous voltage is as electromagnetic interference source.
As shown in figure 15, computing module 12 includes：
Common-mode circuit acquisition submodule 121, for the circuit structure based on electromagnetic interference source, obtains common mode current circuit；
Emulation submodule 122, for carrying out circuit simulation to common mode current circuit, obtains artificial circuit；
First equivalent submodule 123, equivalent for carrying out to artificial circuit, obtain equivalent circuit；
Calculating sub module 124, for calculating the electric current of equivalent circuit based on KVL, obtains the common mode disturbances of electromagnetic interference source
Electric current.
As shown in figure 16, whole machine model acquisition module 13 includes：
Second equivalent submodule 131, equivalent for being carried out using the radiated electric field of antenna pair common-mode interference current, obtain sky
Line equivalent model；
Put into submodule 132, for putting into antenna equivalent model in device model, as target device model.
Wherein, emulation module 14 is CST simulation software, and CST simulation software adopts time-domain transmission wire matrix method to equipment
Model carries out time-domain-simulation, obtains 3 D electromagnetic simulation result；Wherein, boundary condition is open free boundary, and simulation frequency is
0-150MHZ.It is contemplated that a kind of electromagnetic interference source by determining device interior of protection, calculated based on Kirchhoff's theorem
The electric current of the equivalent circuit of common mode current circuit of electromagnetic interference source, obtains the common-mode interference current of electromagnetic interference source, by common mode
The equivalent model obtaining after interference electric current is equivalent is put in the threedimensional model of equipment, obtains target device model；To target device
Model carries out 3 D electromagnetic emulation, obtains 3 D electromagnetic simulation result；The driving source of described 3 D electromagnetic emulation is common mode disturbances
Electric current；The electromagnetic radiation characteristic parameter of extraction equipment from 3 D electromagnetic simulation result.Thus solving in prior art simply
Physical property for interior of aircraft system or equipment is analyzed, not the analysis to electromagnetic radiation characteristic it is achieved that to fly
The analysis of machine internal electromagnetic radiation characteristic and the acquisition of electromagnetic radiation characteristic parameter.On the other hand, due to using equivalent model pair
The common mode radiation electric field of electromagnetic interference source carry out equivalent, and using common-mode interference current as the driving source of final emulation so that
Entirely final phantom simplifies, thus the pressure decreasing simulation time and calculating internal memory, improves electromagnetic radiation characteristic
The acquisition speed of parameter.
It should be appreciated that the above-mentioned specific embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, and be not construed as limiting the invention.Therefore, that is done in the case of without departing from the spirit and scope of the present invention is any
Modification, equivalent, improvement etc., should be included within the scope of the present invention.Additionally, claims purport of the present invention
Covering the whole changes falling in scope and border or the equivalents on this scope and border and repair
Change example.
Claims (10)
1. a kind of extracting method of installation electromagnetical Radiation Characteristics Parameters is it is characterised in that methods described includes：
Determine the electromagnetic interference source of equipment；
Calculate the electric current of the equivalent circuit of the common mode current circuit of described electromagnetic interference source based on Kirchhoff's theorem, obtain described
The common-mode interference current of electromagnetic interference source；
The equivalent model obtaining after will be equivalent for described common-mode interference current is put in the threedimensional model of equipment, obtains target device mould
Type；
3 D electromagnetic emulation is carried out to target device model, obtains 3 D electromagnetic simulation result；What described 3 D electromagnetic emulated swashs
Source of encouraging is described common-mode interference current；
The described electromagnetic radiation characteristic parameter of extraction equipment from described 3 D electromagnetic simulation result.
2. extracting method according to claim 1, wherein, the described step determining electromagnetic interference source includes：
Judge to whether there is in described equipment and have the part of transient current or instantaneous voltage；
When there are the part of described transient current or described instantaneous voltage, there will be described transient current or described instantaneous electricity
The part of pressure is as electromagnetic interference source.
3. extracting method according to claim 1, wherein, the described circuit to described electromagnetic interference source carries out step response
Calculate, the step obtaining the common-mode interference current of described electromagnetic interference source includes：
Based on the circuit structure of described electromagnetic interference source, obtain common mode current circuit；
Circuit simulation is carried out to described common mode current circuit, obtains artificial circuit；
Described artificial circuit is carried out equivalent, obtain equivalent circuit；
Calculate the electric current of equivalent circuit based on Kirchhoff's theorem, obtain the common-mode interference current of described electromagnetic interference source.
4. extracting method according to claim 1, wherein, described will be equivalent for described common-mode interference current after obtain equivalent
Model is put in device model, and the step obtaining target device model includes：
Carried out using the radiated electric field of common-mode interference current described in antenna pair equivalent, obtain antenna equivalent model；
Described antenna equivalent model is put in device model, as target device model.
5. the extracting method according to any one of claim 1-4, wherein, carries out 3 D electromagnetic and imitates to target device model
Very, the step obtaining 3 D electromagnetic simulation result includes：
Time-domain-simulation is carried out to device model using time-domain transmission wire matrix method, obtains 3 D electromagnetic simulation result；Wherein, side
Boundary's condition is open free boundary, and simulation frequency is 0-150MHZ.
6. a kind of extraction system of installation electromagnetical Radiation Characteristics Parameters is it is characterised in that described system includes：
Determining module (11), for determining the electromagnetic interference source of equipment；
Computing module (12), for calculating the equivalent of the common mode current circuit to described electromagnetic interference source based on Kirchhoff's theorem
The electric current of circuit, obtains the common-mode interference current of described electromagnetic interference source；
Object module acquisition module (13), the equivalent model for obtaining after will be equivalent for described common-mode interference current puts into equipment
In threedimensional model, obtain target device model；
Emulation module (14), for carrying out 3 D electromagnetic emulation to target device model, obtains 3 D electromagnetic simulation result；Described
The driving source of 3 D electromagnetic emulation is described common-mode interference current；
Extraction module (15), for the described electromagnetic radiation characteristic parameter of extraction equipment from described 3 D electromagnetic simulation result.
7. extraction system according to claim 6, wherein, described determining module (11) includes：
Judging submodule (110), has the part of transient current or instantaneous voltage for judging to whether there is in described equipment；
Interference source determining module (111), for when there are the part of described transient current or described instantaneous voltage, there will be
The part of described transient current or described instantaneous voltage is as electromagnetic interference source.
8. extraction system according to claim 6, wherein, described computing module (12) includes：
Common-mode circuit acquisition submodule (121), for the circuit structure based on described electromagnetic interference source, obtains common mode current electricity
Road；
Emulation submodule (122), for carrying out circuit simulation to described common mode current circuit, obtains artificial circuit；
First equivalent submodule (123), equivalent for carrying out to described artificial circuit, obtain equivalent circuit；
Calculating sub module (124), for calculating the electric current of equivalent circuit based on Kirchhoff's theorem, obtains described electromagnetic interference source
Common-mode interference current.
9. extraction system according to claim 6, wherein, described whole machine model acquisition module (13) includes：
Second equivalent submodule (131), equivalent for being carried out using the radiated electric field of common-mode interference current described in antenna pair, obtain
Antenna equivalent model；
Put into submodule (132), for putting into described antenna equivalent model in device model, as target device model.
10. the acquisition system according to any one of claim 6-9, wherein, described emulation module (14) emulates soft for CST
Part, described CST simulation software carries out time-domain-simulation using time-domain transmission wire matrix method to device model, obtains 3 D electromagnetic and imitates
True result；Wherein, boundary condition is open free boundary, and simulation frequency is 0-150MHZ.
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| CN110805934A (en) * | 2019-11-14 | 2020-02-18 | 广东美的厨房电器制造有限公司 | Electric cooking device and heating control device thereof |
| CN111353410B (en) * | 2020-02-25 | 2023-04-28 | 北京师范大学珠海分校 | Electromagnetic interference analysis method, device, equipment and storage medium |
| CN111353410A (en) * | 2020-02-25 | 2020-06-30 | 北京师范大学珠海分校 | Electromagnetic interference analysis method, device, equipment and storage medium |
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| CN114065479B (en) * | 2021-10-12 | 2022-10-18 | 荣耀终端有限公司 | Electromagnetic interference evaluation simulation method based on reciprocity principle and computer equipment |
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