CN102540106A - DC (direct current) side EMI noise measuring device for new energy inversion system and measuring and calibrating method - Google Patents
DC (direct current) side EMI noise measuring device for new energy inversion system and measuring and calibrating method Download PDFInfo
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Abstract
The invention discloses a DC side EMI noise measuring device for a new energy inversion system and a measuring and calibrating method. The new energy inversion system includes a new energy module, an inversion control and power quality adjusting module, a load or a connected grid, wherein a DC-LISN is connected onto a conducting wire between the new energy module and the inversion control and power quality adjusting module, and then is connected with an EMI receiver. The method is based on the common formula for measuring the DC side conduction EMI internal impedance of the new energy inversion system through S parameters, adopts the S parameter method to model and measure the internal impedance at the new energy end, the DC-LISN end, and the inversion control and power quality adjusting end, provides sufficient theoretic reference for realizing the final measurement result compensation through combing the wave reflection theory to derive the direct current conduction EMI calibration compensation formula, and provides a reliable reference for the design of a DC side conduction EMI filter at the same time.
Description
Technical field
The invention belongs to the electromagnetic compatibility technology field; It specifically is a kind of new forms of energy inversion system direct current Conducted EMI noise-measuring system; And measure and the compensation calibration method; This method adopts the S parameter to analyze the internal impedance of new forms of energy ends (dc power supply terminals), DC-LISN end, inversion control and quality of power supply adjustable side, based on the wave reflection theoretical research metrophia compensation of direct current Conducted EMI.
Background technology
In short supply day by day along with the increasing of environmental pollution and traditional energy improves energy structure and the renewable new forms of energy of development, and the quality that improves electric energy has become the strategic measure of China's energy development.In recent years along with the progress of Power Electronic Technique and the support of national policy, solar electrical energy generation with its aboundresources, pollution-free, the construction period is short etc., and advantage has caused people's extensive concern.Owing to used a large amount of power electronic devices in the solar grid-connected system, the emc issue of system is highlighted, become the focus that engineering and scientific research personnel pay close attention to, along with increasing its compatibility, the influence of grid-connected system becomes more important.
Traditional Conducted EMI Study on noise mainly is limited to inversion system AC side Research on Noise, does not have the possible generation root of deep structure research Conducted EMI.Inversion system often comprises direct current buck link; Though being different from, DC link exchanges control and quality of power supply governing loop; But the Conducted EMI of high frequency is present among the circuit of DC link equally; How to measure the Conducted EMI of DC link efficiently and accurately, very important vital role is arranged for eliminating the direct or potential influence of Conducted EMI.
Summary of the invention
Technical matters to be solved by this invention provides a kind of new forms of energy inversion system DC side Conducted EMI noise-measuring system and measurement, calibration steps; This device and method is to the impedance information of S parameter measurement; Theoretical in conjunction with wave reflection; Calculating records the size of EMI wave reflection, finally realizes the metrophia compensation of direct current Conducted EMI.
A kind of new forms of energy inversion system DC side Conducted EMI noise-measuring system of the present invention; This new forms of energy inversion system comprises new forms of energy module, inversion control and quality of power supply adjustment module and load or is incorporated into the power networks; The new forms of energy module provides direct supply and outputs to inversion control and quality of power supply adjustment module; Obtaining alternating voltage by inversion control and quality of power supply adjustment module resupplies load or is incorporated into the power networks; On the lead between new forms of energy module and inversion control and the quality of power supply adjustment module, be connected DC-LISN, DC-LISN is connected with EMI receiver or vector network analyzer again.
The present invention also provides Conducted EMI noise measurement of a kind of new forms of energy inversion system DC side and calibration steps, and it may further comprise the steps:
1) on above-mentioned measurement mechanism basis, at first the internal impedance of DC-LISN, new forms of energy module, inversion control and quality of power supply adjustment module is tried to achieve in parameter measurement based on S, and establishing the impedance of new forms of energy module is Z
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustment module internal impedance be Z
X3
2) combining the wave reflection theory to carry out compensation for calibrating errors, is Z according to the new forms of energy module impedance that records
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustment module internal impedance be Z
X3, obtain voltage reflection coefficient
According to the reflection coefficient that formula (3-1) is tried to achieve, try to achieve again:
Virtual voltage V
N=V
+ N/
, reflected voltage V
- NF=
* V
N,
Wherein, V
+ NBe the magnitude of voltage of EMI receiver actual measurement, V
+ NFReflected voltage also is the voltage that needs compensation, V
NBe in esse Conducted EMI voltage.
Above-mentioned steps 1) the measuring and calculating process of each module impedance is:
Use two current probes, an output terminal that is connected to vector network analyzer as injection probe; Another is connected to the input end of vector network analyzer as detection probe, and two probes insert DC-LISN to be measured, new forms of energy module, inversion control and quality of power supply adjustment module respectively through coupling capacitance C, record the noise source internal impedance Z of each module
X, being the impedance of new forms of energy module is Z
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustment module internal impedance be Z
X3
Internal impedance measure equation based on the scattering parameter method is:
In the formula
Be the internal impedance in loop,
Be the coefficient in measurement loop,
S 11Be input reflection coefficient,
S 21Be the forward transmitted coefficient.
Use short-circuit conductors and measuring resistance respectively
R StandardReplace
Z xCan get
The simultaneous following formula calculate can get k with
Z Setup, therefore measure noise source to be measured
Z xScattering parameter, can calculate the noise source internal impedance
Z x
In the above-mentioned formula,
Be the internal impedance in loop,
Be the coefficient in measurement loop,
S 11Be input reflection coefficient,
S 21Be the forward transmitted coefficient.
Above-mentioned steps 2) when considering 2 secondary reflection coefficients, can know that input voltage is reflected voltage V
- NF, can try to achieve 2 secondary reflection coefficients and be:
In the formula,
Be voltage reflection coefficient, Z
X2Be DC-LISN internal impedance, Z
X3For new forms of energy module internal impedance, can know V
+ NBe the magnitude of voltage of EMI receiver actual measurement, V
+ NFReflected voltage, V
NBe in esse Conducted EMI voltage; Formula is arranged:
The reflection coefficient of then trying to achieve according to formula (3-3) is tried to achieve virtual voltage V
2 N=V
2+ N/
, reflected voltage V
2- NF=
* V
2 N, in the formula, V
2 N=V
- NFThe terminal voltage Vr that can know final EMI receiver is: Vr=V
+ N+ V
2- NF=V
N* (1-
)+V
N*
*
, can get voltage transmission coefficient
:
Rectification building-out voltage is:
(3-6)
In like manner, can get current delivery coefficient
for the measurement of electric current:
The rectification building-out electric current is:
(3-8)
The present invention has analyzed the root that new forms of energy inversion system DC side Conducted EMI noise produces from the schematic diagram of new forms of energy inversion system.Define DC side Conducted EMI, analyzed the insertion loss characteristic of DC-LISN, obtained corresponding measure equation.Derived based on the general formula of S parameter measurement new forms of energy inversion system DC side Conducted EMI internal impedance, adopted the S parametric method that the internal impedance modeling of new forms of energy end (dc power supply terminal), DC-LISN end, inversion control and quality of power supply adjustable side is measured.Theoretical in conjunction with wave reflection, the direct current Conducted EMI of having derived compensation for calibrating errors formula is for sufficient confession theoretical foundation has been put forward in the compensation of final realization measurement result.For DC side Conducted EMI Filter Design reliable reference is provided simultaneously.
Description of drawings
Fig. 1 new energy resources system Conducted EMI test philosophy figure;
The definition of Fig. 2 DC side Conducted EMI;
Fig. 3 two-port network S parameter synoptic diagram;
Fig. 4 is based on the internal impedance measuring principle figure of S parameter;
Fig. 5 is based on the noise source internal impedance modeling equivalent circuit diagram of S parametric method;
The Ideal Transmission Line analytical model of Fig. 6 signal reflex;
Fig. 7 filter insertion loss figure, wherein Fig. 7 is before wave filter inserts a), Fig. 7 b) be after wave filter inserts;
Fig. 8 measures based on the DC-LISN end internal impedance of S parameter;
Fig. 9 measures based on the new forms of energy end internal impedance of S parameter;
Figure 10 measures based on the inversion control and the quality of power supply adjustable side internal impedance of S parameter;
Figure 11 reflection parameters model;
Figure 12 secondary reflection parameter model.
Embodiment
The brief introduction of new forms of energy inversion system DC side Conducted EMI test macro
New forms of energy inversion system and DC side Conducted EMI test macro comprise several main parts: new forms of energy module (wind energy, sun power, fuel cell etc.), inversion control and quality of power supply adjustment module, load (being incorporated into the power networks), DC-LISN and EMI receiver.
System provides direct supply through the new forms of energy module, outputs to inversion control and quality of power supply adjustment module, finally obtains the alternating voltage supply load or is incorporated into the power networks.Conducted EMI is present in each module of system, for the influence of researching DC side Conducted EMI to system, has selected the measuring element of DC-LISN as the direct current Conducted EMI.Because the source of direct current Conducted EMI possibly be the inversion control side, also possibly be the new forms of energy module side.To measure respectively the noise of different port in the time of our actual measurement.Like Fig. 1, DC-LISN is the single line turnover, when measuring, when DC-LSIN is connected on A, B port, can realize (turning the turnover line of DC-LISN in the time of measurement) measurement to A, B side Conducted EMI respectively.When DC-LSIN is connected on C, D port, can realize (turning the turnover line of DC-LISN in the time of measurement) measurement respectively to C, D side Conducted EMI.Two EMI receivers have been adopted in the measuring principle figure the inside of Fig. 1, only need in the actual measurement to use an EMI receiver just can measure the Conducted EMI of two leads of DC side.
New forms of energy inversion test macro and DC side Conducted EMI side noise reason and impact analysis
The Conducted EMI noise of DC side has two sources, and one comes from the new forms of energy module side, and another comes from inversion control and quality of power supply adjustment module side.The new forms of energy module side can produce the Conducted EMI of high frequency owing to there is the effect of motor, switching device etc., because the power port of output does not load effective filtering measure, Conducted EMI is easy to get into DC side through the power supply short-term.Inversion control and quality of power supply adjustment module side are the main sources that Conducted EMI produces, because there are a large amount of switching devices in the inversion side, simultaneously owing to problems such as control strategies, possibly produce the Conducted EMI noise of different frequency range, are transferred to DC side.The influence of high frequency noise at DC side often ignored in traditional electromagnetic compatibility research, thinks as long as the final output terminal of inversion can load the influence that filtering measure just can finally be eliminated Conducted EMI.But, facts have proved that Conducted EMI will be to new forms of energy module side and inverter control and the direct or potential influence of quality of power supply adjusting side device generation as long as exist.
Owing to only have two leads, there is not so-called ground wire, at the DC side of inversion system so only there is a kind of noise of situation.For the Conducted EMI between two lines, we can do a simple definition, and are as shown in Figure 2.At the control of new forms of energy module side and inverter and two line: L of quality of power supply adjustment module side definition, N.We suppose the transmission path of Conducted EMI shown in figure, and then the Conducted EMI on the L line is defined as L line Conducted EMI, and the Conducted EMI on the N line is defined as the Conducted EMI of N line.
The definition of parameter and test philosophy
3.1 the ultimate principle of S parameter
S parameter (scattering parameter) is a kind of radio frequency vector parameters, comprises amplitude and phase information simultaneously, can more comprehensively describe network port characteristic.Relation between S parameter reflection port incident wave and the reflection wave.
With two ports is example, tells about ultimate principle.The parameter of normal two ports is as shown in Figure 3.The S parameter is used to represent the relation between incident wave a and the reflection wave b, all available a plurality of its port identities of S parameter characterization of any network.N-terminal-pair network needs n
2Individual S parameter wherein, is represented the S parameter S of a certain port self incident wave and reflection wave relation
IiBe called reflection coefficient, the S parameter S of incident wave between the expression different port and reflection wave relation
IjBe called transmission coefficient.For the physical significance of two-port network S parameter, shown in (3-1), the scattering parameter of this two-port network comprises reflection coefficient S
11And S
22, and transmission coefficient S
12And S
21, the scattering parameter equation of this network can be expressed as:
（3-1）
The physical significance of S parameter is respectively in the formula:
: during 2 impedance matchings of expression port, the reflection coefficient of port one;
: during the impedance matching of expression port one, by the transmission coefficient of port 2 to port one.
For multiport network, establishing port number is n, and the incident wave and the reflection wave of each port are respectively a
nAnd b
n, its scattering parameter matrix equation can be expressed as:
The scattering parameter of multiport network has following character:
S when (1) network is symmetrical
Ii=S
Jj
(2) S during the network reciprocity
Ij=S
Ji
(3) matched load is used for absorbed power, when port i uses matched load, and this port no reflection events.
The realization of measuring based on the internal impedance of S parameter
The scattering parameter method is two current probes of utilization, an output terminal that is connected to vector network analyzer as injection probe; Another is connected to the input end of vector network analyzer as detection probe, and as shown in Figure 4, wherein C is a coupling capacitance, Z
XBe the noise source internal impedance.
Therefore current probe is equivalent to current transformer, can be Fig. 5 with Fig. 4 circuit equivalent, L wherein, L
1, L
2Be respectively the circuit equivalent self-induction, injection probe self-induction, detection probe self-induction; M
1, M
2Be respectively equivalent mutual inductance between injection/detection probe and the circuit; V
1, V
2Be respectively the output signal of vector network analyzer and the reception signal of vector network analyzer.Can get according to Kirchhoff's second law
Cancellation
I 1,
I 2After can get
In order to simplify computing, do as giving a definition:
Then formula (3-6) can be written as
Make
to get
Electric current
ICan record by measuring current probe, can get according to the current probe use principle
In the formula,
U P2Be the voltage signal of vowing that net appearance input end records,
Z T2 For measuring the transport property impedance of current probe.
On the other hand, because
（3-11）
Can get
Can get according to the scattering parameter analytical approach
S 11Be input reflection coefficient,
S 12Be the reverse transfer coefficient,
S 21Be the forward transmitted coefficient,
S 22Be output reflection coefficient, have following relation with wave parameter:
Have again
For the input end and output terminal of vowing the net appearance, characteristic impedance equates and is
, i.e. Z
C1=Z
C2=
, therefore have
Formula (3-12) can be written as
Use short-circuit conductors and measuring resistance respectively
R StandardReplace
Z xCan get
The simultaneous following formula calculate can get k with
Z Setup, therefore measure noise source to be measured
Z xScattering parameter, can calculate noise source
Z x
Reflection parameters and transmission parameter all comprise phase information in the measuring process, so the noise source internal impedance also comprises amplitude and phase information, thereby have avoided the phase place disappearance, and solve the resistance matching problem between noise source and the electromagnetic interface filter effectively.With respect to noise source internal impedance modeling method based on the double-current probe method; This method need not considered the approximate condition of measuring resistance
, has improved measuring accuracy.
Wave reflection is theoretical
When signal transmits on high-speed digital circuit, when the impedance on the transmission line is discontinuous, at this moment the situation of signal reflex can appear on the transmission line.Circuit diagram as shown in Figure 6.Suppose that transmission line L is the digital signal drive source Vs driving of R0 by internal impedance, the characteristic impedance of transmission line is Z0, and loaded impedance does
R LCan divide three kinds of situation discussion:
1) ideal situation is to work as R0=Z0=
R LThe time, the impedance of transmission line is continuous, any reflection can not take place, energy has half to consume in the load internal resistance
R LOn, load absorbs the energy of arrival fully, has no signal reflex Hui Yuanduan, and this situation is called critical damping.
2) if loaded impedance greater than the characteristic impedance of transmission line, the unnecessary energy of load end will reflected back source end so, because load end does not absorb whole energy, therefore claims that this situation is a underdamping.
3) if loaded impedance less than the characteristic impedance of transmission line, the energy more energy that the current source of consumption rate end provides is wanted in load so, therefore brings in the conveying more energy through reflecting notification source, this situation is called overdamping.
For underdamping and overdamping, they can cause reciprocal propagation waveform, can form standing wave on the transmission line in some cases.Critical damping is a kind of state of reflecting can avoided fully.But the critical damping situation is difficult to realize, will adopt slight overdamping mode in the general reality.
The load end impedance does not match in transmission line impedance can be at load end (B) antireflection part signal Hui Yuanduan (A point); The reflected voltage signal amplitude is by load reflection coefficient
decision, promptly
In the formula (4-1),
LBe the load voltage reflection coefficient, be actually the ratio of reflected voltage and incident voltage;
R LLoaded impedance; Z
0Characteristic impedance for transmission line.
Can know-1 through top formula
L 
+ 1, and work as
R L=Z
0The time,
L=0, will reflex can not take place at this moment.Thus it is clear that,, just can eliminate reflection as long as carry out the terminal coupling according to the characteristic impedance of transmission line.
When the voltage from the load end reflected back arrives the source end, incite somebody to action reflected back load end once more again, form the secondary reflection ripple, the amplitude of reflected voltage at this moment is by the source reflection coefficient
SDecision, promptly
Signal through behind the secondary reflection acts on very faint.Can no longer do deep consideration.
The present invention is directed to the signal reflection problem that possibly exist in the noise measurement of direct current Conducted EMI, adopt the S parametric method, full frequency band is measured the noise source internal impedance, and experimental configuration is simple relatively, and reliability is high.In conjunction with the wave impedance that records, adopt the wave reflection theory to compensate calculating.Calculate compensation through its corresponding theory, the result who makes test also provides impedance information the most accurately for squelch more near actual value.
Embodiment
1. based on the insertion loss measurement of the DC-LISN of A parameter
Electromagnetic interface filter is weighed with inserting loss IL (Insertion Loss) the inhibition ability of interference noise.Insert being defined as of loss: when not having wave filter to insert, the power P 1 that is transferred to load from noise source with insert wave filter after, noise source is transferred to the ratio of the power P 2 of load, representes with dB (decibel).Circuit before and after wave filter inserts is as shown in Figure 7.
So
(1-4)
Can get
(1-5) by Fig. 7 (a)
The Network Transmission equation of Fig. 7 (b) is
(1-6)
(1-8) simultaneously
Formula (1-6) ~ (1-9) simultaneous can solve V
2For
Then (1-10), (1-5) are updated in (1-4), try to achieve
For Fig. 7 (b), we adopt A parametric representation FL-network, and the A parameter matrix does
2. measure based on the internal impedance of DC-LISN end, new forms of energy (dc power supply terminal), inversion control and the quality of power supply adjustable side of S parameter.
2.1 the internal impedance based on the DC-LISN of S parameter is measured
In the technical scheme of the invention, drawn formula (seeing formula (3-16)) based on S parameter measurement impedance, COEFFICIENT K and source internal impedance Z are arranged in the formula
SetupTwo unknown numbers are so in order to measure unknown impedance, also need carry out twice measurement (seeing formula (3-17), formula (3-18)) of short circuit and adjunction normal impedance.
（2-1）
Z in the formula
XBe impedance to be asked, K is a related coefficient, Z
SetupThe source internal impedance, S
3 21, S
3 11S parameter for the frequency spectrograph measurement
K is a related coefficient in the formula, Z
SetupThe source internal impedance, S
1 21, S
1 11S parameter for the frequency spectrograph measurement
（2-3）
R in the formula
StandardBe normal impedance, K is a related coefficient, Z
SetupThe source internal impedance, S
2 21, S
2 11S parameter for the frequency spectrograph measurement
The computing of through type (2-2), formula (2-3) can solve COEFFICIENT K and source impedance Z
SetupTwo unknown numbers.In the substitution formula then (2-1), just can obtain the impedance Z that will ask for
XTest is arranged as shown in Figure 8, and the gained result is the internal impedance of DC-LISN.
2.2 new forms of energy (dc power supply terminal) internal impedance based on the S parameter is measured
It is identical with the DC-LISN principle that the internal impedance of dc power supply terminal is asked for, and formula can get new forms of energy end internal impedance among through type (2-1), (2-2), (2-3), and test is arranged as be as shown in Figure 9.
2.3 inversion control and quality of power supply adjustable side internal impedance based on the S parameter are measured
It is identical with the DC-LISN principle that the internal impedance of inversion control and quality of power supply adjustable side is asked for, and formula can get inversion control and quality of power supply adjustable side internal impedance among through type (2-1), (2-2), (2-3), and test is arranged shown in figure 10.
3. the compensation for calibrating errors of wave reflection
Through 2.1,2.2,2.3 find the solution.We have obtained new forms of energy (dc power supply terminal), DC-LISN end, three impedances of inversion control and quality of power supply adjustable side, and establishing new forms of energy (dc power supply terminal) impedance is Z
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustable side internal impedance be Z
X3Wave reflection in conjunction with the summary of the invention the inside is theoretical, and we know.When Conducted EMI is transmitted in dc terminal.Certainly exist wave reflection; When we adjunction DC-LISN carried out the Conducted EMI measurement, owing to do not consider wave reflection, possibly there was deviation in actual measurement; In order to obtain Conducted EMI information the most accurately, we can combine the wave reflection theory to carry out compensation for calibrating errors.Like Figure 11, when we have overlapped the Conducted EMI of preparation measurement inversion control and quality of power supply adjustable side.Consider that there is V inversion control and quality of power supply adjustable side
NConducted EMI output to DC-LISN when end because there is wave reflection in not matching of impedance,, can obtain voltage reflection coefficient in conjunction with our DC of side-LISN end, inversion control and the impedance of quality of power supply adjustable side.
In the formula,
Be voltage reflection coefficient, Z
X2Be DC-LISN end internal impedance, Z
X3Be new forms of energy end (dc power supply terminal) internal impedance.According to test connection Figure 11, can know V
+ NBe the magnitude of voltage of EMI receiver actual measurement, V
+ NFReflected voltage, V
NBe in esse Conducted EMI voltage, formula arranged:
（3-2）
According to the reflection coefficient that formula (3-1) is tried to achieve, can be in the hope of virtual voltage V
N=V
+ N/
, reflected voltage V
- NF=
* V
NSo,, when measuring, V
- NFBe the voltage that needs compensation, can be converted into the measured value of EMI receiver through corresponding conversion.
Fig. 7 when considering 2 secondary reflection coefficients, can know that input voltage is reflected voltage V
- NF, can try to achieve 2 secondary reflection coefficients and be:
In the formula,
Be voltage reflection coefficient, Z
X2Be DC-LISN end internal impedance, Z
X3Be new forms of energy end (dc power supply terminal) internal impedance.According to test connection Figure 12, can know V
+ NBe the magnitude of voltage of EMI receiver actual measurement, V
+ NFReflected voltage, V
NBe in esse Conducted EMI voltage.Formula is arranged:
（3-4）
The reflection coefficient of then trying to achieve according to formula (3-3) can be in the hope of virtual voltage V
2 N=V
2+ N/
, reflected voltage V
2- NF=
* V
2 N, in the formula, V
2 N=V
- NFThe terminal voltage (being made as Vr) that can know final EMI receiver is: Vr=V
+ N+ V
2- NF=V
N* (1-
)+V
N*
*
, can get voltage transmission coefficient and (be made as
):
Rectification building-out voltage is:
(3-6)
In like manner, can get current delivery coefficient (being made as
) for the measurement of electric current:
The rectification building-out electric current is:
(3-8)
The above only is a preferred implementation of the present invention, should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvement, and these improvement also should be regarded as protection scope of the present invention.
Claims (4)
1. new forms of energy inversion system DC side Conducted EMI noise-measuring system; Said new forms of energy inversion system comprises new forms of energy module, inversion control and quality of power supply adjustment module and load or is incorporated into the power networks; The new forms of energy module provides direct supply and outputs to inversion control and quality of power supply adjustment module; Obtaining alternating voltage by inversion control and quality of power supply adjustment module resupplies load or is incorporated into the power networks; It is characterized in that on the lead between new forms of energy module and inversion control and the quality of power supply adjustment module, be connected DC-LISN, DC-LISN is connected with EMI receiver or vector network analyzer again.
2. new forms of energy inversion system DC side Conducted EMI noise measurement and calibration steps, its characteristic comprises following step:
1) on above-mentioned measurement mechanism basis, at first the internal impedance of DC-LISN, new forms of energy module, inversion control and quality of power supply adjustment module is tried to achieve in parameter measurement based on S, and establishing the impedance of new forms of energy module is Z
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustment module internal impedance be Z
X3
2) combining the wave reflection theory to carry out compensation for calibrating errors, is Z according to the new forms of energy module impedance that records
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustment module internal impedance be Z
X3, obtain voltage reflection coefficient
According to the reflection coefficient that formula (3-1) is tried to achieve, try to achieve again:
Virtual voltage V
N=V
+ N/
, reflected voltage V
- NF=
* V
N,
Wherein, V
+ NBe the magnitude of voltage of EMI receiver actual measurement, V
+ NFReflected voltage also is the voltage that needs compensation, V
NBe in esse Conducted EMI voltage.
3. new forms of energy inversion system DC side according to claim 2 Conducted EMI noise measurement and calibration steps is characterized in that the measuring and calculating process of each module impedance of step 1) is:
Use two current probes, an output terminal that is connected to vector network analyzer as injection probe; Another is connected to the input end of vector network analyzer as detection probe, and two probes insert DC-LISN to be measured, new forms of energy module, inversion control and quality of power supply adjustment module respectively through coupling capacitance C, record the noise source internal impedance Z of each module
X, being the impedance of new forms of energy module is Z
X1, DC-LISN internal impedance is Z
X2, inversion control and quality of power supply adjustment module internal impedance be Z
X3Internal impedance measure equation based on the scattering parameter method is:
In the formula
Be the internal impedance in loop,
Be the coefficient in measurement loop,
S 11Be input reflection coefficient,
S 21Be the forward transmitted coefficient;
Use short-circuit conductors and measuring resistance respectively
R StandardReplace
Z xCan get
The simultaneous following formula calculate can get k with
Z Setup, therefore measure noise source to be measured
Z xScattering parameter, can calculate the noise source internal impedance
Z x
In the above-mentioned formula,
Be the internal impedance in loop,
For measuring the coefficient in loop, S
11Be input reflection coefficient,
S 21Be the forward transmitted coefficient.
4. according to claim 2 or 3 Conducted EMI noise measurement of described new forms of energy inversion system DC side and calibration stepss, it is characterized in that step 2) when considering the secondary reflection coefficient, can know that input voltage is reflected voltage V
- NF, can try to achieve the secondary reflection coefficient and be:
In the formula,
Be voltage reflection coefficient, Z
X2Be DC-LISN internal impedance, Z
X3For new forms of energy module internal impedance, can know V
+ NBe the magnitude of voltage of EMI receiver actual measurement, V
+ NFReflected voltage, V
NBe in esse Conducted EMI voltage; Formula is arranged:
The reflection coefficient of then trying to achieve according to formula (3-3) is tried to achieve virtual voltage V
2 N=V
2+ N/
, reflected voltage V
2- NF=
* V
2 N, in the formula, V
2 N=V
- NF
The terminal voltage Vr that can know final EMI receiver is: Vr=V
+ N+ V
2- NF=V
N* (1-
)+V
N*
*
, can get voltage transmission coefficient
:
Compensation for calibrating errors voltage is:
(3-6)
In like manner, can get current delivery coefficient
for the measurement of electric current:
The rectification building-out electric current is:
(3-8)
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210020645.2A CN102540106B (en) | 2012-01-30 | 2012-01-30 | DC (direct current) side EMI noise measuring device for new energy inversion system and measuring and calibrating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210020645.2A CN102540106B (en) | 2012-01-30 | 2012-01-30 | DC (direct current) side EMI noise measuring device for new energy inversion system and measuring and calibrating method |
Publications (2)
| Publication Number | Publication Date |
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| CN102540106A true CN102540106A (en) | 2012-07-04 |
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| CN103091558A (en) * | 2013-01-21 | 2013-05-08 | 南京师范大学 | Drawing circuit for resistance in photovoltaic grid-connected inverter direct current side noise source and method |
| CN103592543A (en) * | 2013-11-19 | 2014-02-19 | 浙江吉利汽车研究院有限公司 | Testing device for instantaneous state conducted emission of electronic and electrical device of automobile |
| CN104796175A (en) * | 2014-01-22 | 2015-07-22 | 英特尔公司 | Techniques for characterizing a transmission line |
| CN105277819A (en) * | 2014-05-28 | 2016-01-27 | 富士施乐株式会社 | Noise immunity evaluation apparatus and method of evaluating noise immunity |
| CN105354397A (en) * | 2015-12-08 | 2016-02-24 | 中国科学院电工研究所 | Design method for common-mode electro-magnetic interference filter for motor drive system |
| CN105353226A (en) * | 2015-11-03 | 2016-02-24 | 江苏省计量科学研究院 | EMI noise source impedance equivalent parameter extraction method based on scattering parameter and intelligent algorithm |
| CN106053945A (en) * | 2016-07-05 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Short-time S-function Smith chart analyzing device and short-time S-function Smith chart analyzing method |
| CN106405288A (en) * | 2016-08-31 | 2017-02-15 | 北京航空航天大学 | Method for obtaining electromagnetic transmission matrix of linear impedance stabilization network |
| CN107390051A (en) * | 2017-07-03 | 2017-11-24 | 北京理工雷科电子信息技术有限公司 | A kind of online characteristic measurement method of component based on inductive coupled principle and measurement apparatus |
| CN108287283A (en) * | 2018-02-05 | 2018-07-17 | 天津理工大学 | The test equipment and conducted immunity test method of a kind of impedance loop under industrial environment |
| CN110988490A (en) * | 2019-12-20 | 2020-04-10 | 北京无线电计量测试研究所 | Power filter differential loss time domain measurement system and method |
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| CN106405288A (en) * | 2016-08-31 | 2017-02-15 | 北京航空航天大学 | Method for obtaining electromagnetic transmission matrix of linear impedance stabilization network |
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