CN110287558A - The method for building up of DC/DC changer system far-field radiation prediction model - Google Patents
The method for building up of DC/DC changer system far-field radiation prediction model Download PDFInfo
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Abstract
The invention discloses a kind of method for building up of DC/DC changer system far-field radiation prediction model, and the basic structure of simplified model is determined according to the noise loop of changer system；When converter works, node N0Voltage and current generate mutation, make transistor S become noise voltage source Vn, in high band, input filter capacitor Cin, output filter capacitor CoutIt is considered as short circuit, inductance L is considered as open circuit.According to the parasitic capacitance and actual circuit structure in the common-mode noise circuit of cable and converter, establish suitable equivalent aerial model, the model and actual circuit is set to have identical capacitive coupling parameter, to achieve the purpose that predict real transform device system far-field radiation using the equivalent model.
Description
Technical field
The invention belongs to predictive transformation device far-field radiation field of noise, are related to a kind of pre- based on capacity coupled far-field radiation
Survey model.
Background technique
The miniaturization of power inverter, integrated, high frequency trend make the electromagnetic interference problem in system more prominent.
The environment of the test such as anechoic chamber, TEM cell at present is that converter far-field radiation brings standardized evaluation measures；However
Such test environment can only provide the direct result of field strength size, cannot make analysis to the radiation mechanism of changer system.
The far-field radiation of converter is mainly as caused by the common mode current of cable；Cable, PCB and infinitely great ground level it
Between capacitive coupling then provide access for common mode current；Power electronic devices high frequency on-off is to generate the origin cause of formation of common-mode noise.It adopts
With the capacitive coupling and noise source voltage spectrum in method analytic transformation device system appropriate, can effective analysis system it is remote
Field radiation.
Summary of the invention
Goal of the invention: in order to predict that DC/DC changer system far-field radiation, the present invention provide a kind of DC/DC converter system
The method for building up of system far-field radiation prediction model, this method propose one kind to predict DC/DC converter far field based on capacitive coupling
Plain antenna model (the Simplified Antenna Model in far-field radiation for power of radiation
Converter, SAM)), according to the noise voltage spectral of the parasitic capacitance parameter and noise source of cable and printed circuit board, build
Vertical voltage drives antenna equivalent model, predicts converter far-field radiation.Solving DC/DC converter is having cable connection
In the case where, the modeling and forecasting problem of far-field radiation transmitting.
Technical solution: to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of method for building up of DC/DC changer system far-field radiation prediction model, comprising the following steps:
Step 1, the basic structure of simplified model is determined according to the noise loop of changer system；
Step 2, when converter works, node N0Voltage and current generate mutation, make transistor S become noise voltage
Source Vn, in high band, input filter capacitor Cin, output filter capacitor CoutIt is considered as short circuit, inductance L is considered as open circuit；Common mode current
Circulation path are as follows: electric current one passes through one C of parasitic capacitance1It flows into, is flowing through input filter capacitor Cin, electric current two-way superparasitization capacitor
Two C2It flows into, flows through transistor S after two electric current mixing, transistor S is made to become noise voltage source Vn, pass through parasitic capacitance later
Three CCMFlow into underground；
Cable and noise source node N can be obtained by equivalent transformation0Between coupled capacitor be
Wherein, CcpFor cable and noise source node N0Between coupled capacitor；
Step 3, the equivalent coupled path of common mode current are as follows: noise voltage source VnAnode flanks three C of parasitic capacitanceCM, it is parasitic
Three C of capacitorCMGround connection, noise voltage source VnAnode flanks complex capacitance C3, complex capacitance C3Ground connection, complex capacitance C3For parasitic electricity
Hold a C1Two C of+parasitic capacitance2；
Step 4, antenna model SAM is obtained according to the equivalent coupled path of common mode current, antenna model SAM uses top crown
Represent node N0；Cable is successively by bottom crown, noise voltage source Vn, top crown be connected, ten C of capacitor10One end is connect with top crown,
Other end ground connection, three C of capacitor3One end is connect with top crown, other end ground connection, top crown radius r1, bottom crown radius r2, pole plate
Spacing h, to top crown radius r1, bottom crown radius r2, pole plate spacing h be iterated calculating, make ten C of capacitor10With parasitic capacitance
Three CCMIt is equal；To length of cable, diameter is iterated calculating makes C3With C1+C2Difference be less than tolerance t.
Preferred: changer system includes and input side power supply VinConnected conducting wire, input filter capacitor Cin, output filter
Wave capacitor Cout, one C of parasitic capacitance1, two C of parasitic capacitance2, transistor S, pcb board, inductance L, diode D, three C of parasitic capacitanceCM、
Resistance Rload, wherein input filter capacitor Cin, output filter capacitor CoutOne end pass through conducting wire respectively and be connected to power supply VinJust
Pole, input filter capacitor Cin, output filter capacitor CoutThe other end power supply V is connected to by conducting wireinCathode, node N0It is PCB
The drain electrode of transistor S, inductance L, diode D connected region on plate；The one end the inductance L is connected to input filter capacitor CinElectricity
Source negative side, the other end are connected to node N0On, one end of the diode D is connected to node N0On, the other end is connected to output
Filter capacitor CoutPower cathode side, resistance RloadIt is connected to output filter capacitor CoutBoth ends on, the transistor S's
Drain electrode is connected to node N0On, the source electrode of the transistor S is connected to input filter capacitor CinPower cathode side, the parasitic electricity
Hold a C1One end Jie power supply VinOn the conducting wire of side of the positive electrode, other end ground connection, two C of parasitic capacitance2One end Jie power supply Vin
On the conducting wire of negative side, other end ground connection, three C of parasitic capacitanceCMOne end Jie node N0On, other end ground connection.
Preferred: top crown, bottom crown use circular layout.
It is preferred: to change the coupling of top crown, the radius of bottom crown and pole plate spacing adjustment pole plate to infinitely great ground level
Capacitor.
It is preferred: to test frequency range, input filter capacitor C in radiationin, output filter capacitor CoutIt is considered as short circuit, inductance L view
For open circuit, transistor S is high frequency noise voltages source, and twisted a pair of of cable is considered as single, only exists line in antenna model SAM
Cable, the part microstrip line at noise source both ends, over the ground coupled capacitor.
The present invention compared with prior art, has the advantages that
1. it is suitable etc. to establish according to the parasitic capacitance and actual circuit structure in the common-mode noise circuit of cable and converter
Antenna model is imitated, the model and actual circuit is made to have identical capacitive coupling parameter, is predicted in fact to reach using the equivalent model
The purpose of border changer system far-field radiation.
2. testing frequency range in radiation, the capacity cell in circuit is considered as short circuit, and inductance element is considered as open circuit, switching device view
For high frequency noise voltages source.Therefore, twisted a pair of of cable can be considered single, and cable, noise source both ends are only existed in model
Part microstrip line, over the ground coupled capacitor.
3. emitter region and ground level use circular layout, the radius of bottom crown and the spacing of pole plate are in change so as to adjust pole
Coupled capacitor of the plate to infinitely great ground level.Noise excitation source is added between pole plate, that is, the far-field radiation of the model can be predicted.
Detailed description of the invention
Fig. 1 is the topological structure of boost converter；
Fig. 2 is converter high frequency common mode current circuit；
Fig. 3 is common mode current equivalent coupled path；
Fig. 4 is the nuclear structure of SAM；
Fig. 5 is SAM structure sectional view；
The design and Establishing process figure that Fig. 6 is SAM；
Each physical quantity is explained as follows in text:
Vin--- input side power supply；Cin--- input filter capacitor；Cout--- output filter capacitor；C1--- parasitic electricity
Rong Yi；C2--- parasitic capacitance two；S——MOSFET；L --- inductance；D --- diode；CCM--- parasitic capacitance three,
Rload--- load resistance；Vn--- noise voltage source；C3——C1And C2Parallel equivalent capacitor；C10--- top crown is to ginseng
Examine the capacitor of plane；r1--- top crown radius；r2--- bottom crown radius；H --- pole plate spacing；rs、ds--- the half of shell
Diameter and height；re--- the radius of top crown；rp--- the radius of bottom crown；te、tp--- the thickness of upper bottom crown；des——
Top crown and the spacing with upper surface of outer cover；dep--- the spacing of upper bottom crown；dsp--- between bottom crown and shell lower surface
Away from；te、tp--- upper and lower electrode thickness.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these examples are merely to illustrate this
It invents rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention various
The modification of equivalent form falls within the application range as defined in the appended claims.
A kind of method for building up of DC/DC changer system far-field radiation prediction model, comprising the following steps:
1. in far-field radiation model, SAM method for building up.Simplified model is determined according to the noise loop of changer system first
Basic structure；Then according to circuit structure each in noise loop, capacitive coupling determines the size of each element in equivalent model over the ground
And relative position, so that equivalent model and real system direct-to-ground capacitance having the same.
2. the method for improving SAM.When input and output have cable, additional S parameter should be carried out to cable Two-port netwerk and is extracted,
Then power supply or the equivalent dimension of load in correction model make model Two-port netwerk S parameter having the same.
As shown in figure 5, specifically includes the following steps:
Step 1, the basic structure of simplified model is determined according to the noise loop of changer system；
As shown in Figure 1, in Boost, changer system includes and input side power supply VinConnected conducting wire, and it is defeated
Enter side power supply VinConnected conducting wire is twisted pair wire, input filter capacitor Cin, output filter capacitor Cout, one C of parasitic capacitance1, post
Raw two C of capacitor2, transistor S, pcb board, inductance L, diode D, three C of parasitic capacitanceCM, resistance Rload, wherein input filter electricity
Hold Cin, output filter capacitor CoutOne end pass through conducting wire respectively and be connected to power supply VinAnode, input filter capacitor Cin, output filter
Wave capacitor CoutThe other end power supply V is connected to by conducting wireinCathode, node N0Be the drain electrode of transistor S on pcb board, inductance L,
Diode D connected region；The one end the inductance L is connected to input filter capacitor CinPower cathode side, the other end are connected to section
Point N0On, one end of the diode D is connected to node N0On, the other end is connected to output filter capacitor CoutPower cathode side,
Resistance RloadIt is connected to output filter capacitor CoutBoth ends on, the drain electrode of the transistor S is connected to node N0On, it is described
The source electrode of transistor S is connected to input filter capacitor CinPower cathode side, one C of parasitic capacitance1One end Jie power supply VinJust
On the conducting wire of pole side, other end ground connection, two C of parasitic capacitance2One end Jie power supply VinOn the conducting wire of negative side, another termination
Ground, three C of parasitic capacitanceCMOne end Jie node N0On, other end ground connection.
C can be obtained using analytical analysis appropriate or numerical computation method1、C2、CCM.In addition, input (output) has cable
Connect the S Parameters of Transistor that cable Two-port netwerk should be also extracted when power supply (load).
Step 2, when converter works, node N0Voltage and current generate mutation, make transistor S become noise voltage
Source Vn, in high band (30~1000MHz), input filter capacitor Cin, output filter capacitor CoutIt is considered as short circuit, inductance L is considered as out
Road；The circulation path of common mode current is as shown in phantom in Figure 1.The circulation path of common mode current are as follows: electric current one passes through parasitic capacitance
One C1It flows into, is flowing through input filter capacitor Cin, two C of electric current two-way superparasitization capacitor2It flows into, flows through crystalline substance after two electric current mixing
Body pipe S makes transistor S become noise voltage source Vn, pass through three C of parasitic capacitance laterCMFlow into underground；
The common mode current path of changer system is individually proposed, as shown in Fig. 2, can obtain cable by equivalent transformation and make an uproar
Sound source node N0Between coupled capacitor be
Wherein, CcpFor cable and noise source node N0Between coupled capacitor；
Step 3, as shown in figure 3, the equivalent coupled path of common mode current are as follows: noise voltage source VnAnode flanks parasitic capacitance
Three CCM, three C of parasitic capacitanceCMGround connection, noise voltage source VnAnode flanks complex capacitance C3, complex capacitance C3Ground connection, complex capacitance C3
For one C of parasitic capacitance1Two C of+parasitic capacitance2；
Step 4, it is qualitatively realized on the basis of the radiation patterns schematic diagram of Fig. 3, obtains can be used for actual analysis
Plain antenna model SAM, i.e., obtaining antenna model SAM according to the equivalent coupled path of common mode current, (voltage drives antenna etc.
Imitate model), as shown in figure 4, antenna model SAM represents node N using top crown0；Cable is successively by bottom crown, noise voltage source
Vn, top crown be connected, ten C of capacitor10One end is connect with top crown, other end ground connection, three C of capacitor3One end is connect with top crown, separately
One end ground connection.CCM、C1+C2Respectively correspond C10And C3。
In order to make Fig. 4 model realization C10=CCM, C+=C1+C2, the parameter of SAM should also be adjusted.In view of in majority
In the case of PCB conducting wire be all irregular shape, for the convenience for modeling, calculating, facilitate to reduce model using round pole plate
Parameter, while modification model is also convenient for be iterated.The structure size of SAM such as Fig. 5, rs、dsFor the radius of shell (conductor 0)
And height, re、rpRadius, t for pole platee、tpFor the thickness of pole plate, des、dep、dspThe respectively spacing of two-plate and shell.
The basic procedure of iterative algorithm such as Fig. 6, the spacing of two-plate, the thickness of the part PCB pole plate use the parameter of actual circuit plate；On
Pole plate radius r1, bottom crown radius r2, pole plate spacing h, to top crown radius r1, bottom crown radius r2, pole plate spacing h changes
In generation, calculates, and makes ten C of capacitor10With three C of parasitic capacitanceCMIt is equal；Similarly, length of cable, diameter are iterated in Fig. 4 model
Calculating makes C3With C1+C2Difference be less than tolerance t.When inputting cable connection DC power supply, it is also contemplated that the shadow of DC power supply
It rings.
The specific steps of iterative algorithm are as follows:
1. determining initial value: according to aforementioned SAM nuclear structure, SAM has the feature of plane-parallel capacitor.In order to reduce iteration
Variable should determine pole plate spacing d firstep；D is directly selected according to the thickness of real transform device system PCB substrate and materialepWith
εrepInitial value.Determine depAfter r can be obtainedeInitial value
Similarly, dspInitial value also should be equal with the thickness of pedestal, according toObtain rpInitial value
With C12、C20Different, the C by conductor radius iteration10Pass through desIt is adjusted；desInitial value should smaller (des<
10dep), it generally selects
2. setting Iteration: after determining initial value, the Iteration of corresponding construction parameter can be obtained using similar principles
Change top crown, the radius of bottom crown and pole plate spacing adjustment pole plate to the coupled capacitor of infinitely great ground level.?
Noise excitation source is added between pole plate, that is, the far-field radiation of the model can be predicted.
Therefore frequency range, input filter capacitor C are tested in radiationin, output filter capacitor CoutIt is considered as short circuit, inductance L is considered as out
Road, transistor S are high frequency noise voltages source, and twisted a pair of of cable is considered as single, and cable is only existed in antenna model SAM, is made an uproar
The part microstrip line at sound source both ends, over the ground coupled capacitor.
SAM and real transform device system far field radiation characteristics having the same can be realized by above procedure.It will be above-mentioned
SAM, which carries out material objectization, can be obtained the test module that far-field radiation analysis can be carried out to changer system.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of method for building up of DC/DC changer system far-field radiation prediction model, which comprises the following steps:
Step 1, the basic structure of simplified model is determined according to the noise loop of changer system；
Step 2, when converter works, node N0Voltage and current generate mutation, make transistor S become noise voltage source Vn,
In high band, input filter capacitor Cin, output filter capacitor CoutIt is considered as short circuit, inductance L is considered as open circuit；The circulation of common mode current
Path are as follows: electric current one passes through one C of parasitic capacitance1It flows into, is flowing through input filter capacitor Cin, two C of electric current two-way superparasitization capacitor2
It flows into, flows through transistor S after two electric current mixing, transistor S is made to become noise voltage source Vn, pass through three C of parasitic capacitance laterCM
Flow into underground；Cable and noise source node N can be obtained by equivalent transformation0Between coupled capacitor beIts
In, CcpFor cable and noise source node N0Between coupled capacitor；
Step 3, the equivalent coupled path of common mode current are as follows: noise voltage source VnAnode flanks three C of parasitic capacitanceCM, parasitic capacitance
Three CCMGround connection, noise voltage source VnAnode flanks complex capacitance C3, complex capacitance C3Ground connection, complex capacitance C3For parasitic capacitance one
C1Two C of+parasitic capacitance2；
Step 4, antenna model SAM is obtained according to the equivalent coupled path of common mode current, antenna model SAM is represented using top crown
Node N0；Cable is successively by bottom crown, noise voltage source Vn, top crown be connected, ten C of capacitor10One end is connect with top crown, another
End ground connection, three C of capacitor3One end is connect with top crown, other end ground connection, top crown radius r1, bottom crown radius r2, pole plate spacing
H, to top crown radius r1, bottom crown radius r2, pole plate spacing h be iterated calculating, make ten C of capacitor10With three C of parasitic capacitanceCM
It is equal；To length of cable, diameter is iterated calculating makes C3With C1+C2Difference be less than tolerance t.
2. the prediction model of DC/DC changer system far-field radiation according to claim 1, it is characterised in that: converter system
System includes and input side power supply VinConnected conducting wire, input filter capacitor Cin, output filter capacitor Cout, one C of parasitic capacitance1, post
Raw two C of capacitor2, transistor S, pcb board, inductance L, diode D, three C of parasitic capacitanceCM, resistance Rload, wherein input filter electricity
Hold Cin, output filter capacitor CoutOne end pass through conducting wire respectively and be connected to power supply VinAnode, input filter capacitor Cin, output filter
Wave capacitor CoutThe other end power supply V is connected to by conducting wireinCathode, node N0Be the drain electrode of transistor S on pcb board, inductance L,
Diode D connected region；The one end the inductance L is connected to input filter capacitor CinPower cathode side, the other end are connected to section
Point N0On, one end of the diode D is connected to node N0On, the other end is connected to output filter capacitor CoutPower cathode side,
Resistance RloadIt is connected to output filter capacitor CoutBoth ends on, the drain electrode of the transistor S is connected to node N0On, it is described
The source electrode of transistor S is connected to input filter capacitor CinPower cathode side, one C of parasitic capacitance1One end Jie power supply VinJust
On the conducting wire of pole side, other end ground connection, two C of parasitic capacitance2One end Jie power supply VinOn the conducting wire of negative side, another termination
Ground, three C of parasitic capacitanceCMOne end Jie node N0On, other end ground connection.
3. the prediction model of DC/DC changer system far-field radiation according to claim 2, it is characterised in that: top crown, under
Pole plate uses circular layout.
4. the prediction model of DC/DC changer system far-field radiation according to claim 3, it is characterised in that: pole in change
The coupled capacitor of plate, the radius of bottom crown and pole plate spacing adjustment pole plate to infinitely great ground level.
5. the prediction model of DC/DC changer system far-field radiation according to claim 4, it is characterised in that: surveyed in radiation
Try frequency range, input filter capacitor Cin, output filter capacitor CoutIt is considered as short circuit, inductance L is considered as open circuit, and transistor S is high-frequency noise
Voltage source, twisted a pair of of cable be considered as it is single, only existed in antenna model SAM cable, noise source both ends part microstrip line,
Coupled capacitor over the ground.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113468850A (en) * | 2021-04-30 | 2021-10-01 | 中国电子科技集团公司第十四研究所 | Non-isolated power supply electromagnetic radiation interference rapid prediction method |
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| CN102981086A (en) * | 2012-12-10 | 2013-03-20 | 江苏省产品质量监督检验研究院 | Analysis and measurement method for electromagnetic radiation of voltage driven radiation source |
| CN106533382A (en) * | 2016-12-01 | 2017-03-22 | 哈尔滨工业大学 | T-type impedance matching circuit applied to ultrahigh frequency DC/DC power converter and parameter design method thereof |
| CN106908666A (en) * | 2017-02-23 | 2017-06-30 | 南京航空航天大学 | A kind of Boost circuit and its output capacitance ESR monitoring methods |
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| CN102981086A (en) * | 2012-12-10 | 2013-03-20 | 江苏省产品质量监督检验研究院 | Analysis and measurement method for electromagnetic radiation of voltage driven radiation source |
| CN106533382A (en) * | 2016-12-01 | 2017-03-22 | 哈尔滨工业大学 | T-type impedance matching circuit applied to ultrahigh frequency DC/DC power converter and parameter design method thereof |
| CN106908666A (en) * | 2017-02-23 | 2017-06-30 | 南京航空航天大学 | A kind of Boost circuit and its output capacitance ESR monitoring methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113468850A (en) * | 2021-04-30 | 2021-10-01 | 中国电子科技集团公司第十四研究所 | Non-isolated power supply electromagnetic radiation interference rapid prediction method |
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