CN106053959A - Method for determining output impedance and voltage division coefficient of V type line impedance stabilization network - Google Patents
Method for determining output impedance and voltage division coefficient of V type line impedance stabilization network Download PDFInfo
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- CN106053959A CN106053959A CN201610498283.6A CN201610498283A CN106053959A CN 106053959 A CN106053959 A CN 106053959A CN 201610498283 A CN201610498283 A CN 201610498283A CN 106053959 A CN106053959 A CN 106053959A
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- dividing potential
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
Abstract
The invention, which belongs to the technical field of the electromagnetic-compatibility conducted emission testing, discloses a method for determining an output impedance and a voltage division coefficient of a V type line impedance stabilization network (LISN). According to the method, for an LISN with known element parameters in a description, the output impedance and voltage division coefficient of the LISN can be obtained based on calculation and analysis; and a tested piece interference voltage value that is measured practically by a receiver during a testing process can be corrected. According to the invention, the method plays an important role in correcting a conducted emission testing result and has guiding significance in improving the conducted emission testing precision.
Description
Technical field
The present invention relates to a kind of V-type linear impedance stabilization network output impedance and dividing potential drop coefficient determines method, pass through the party
Method with the output impedance of computational analysis V-type linear impedance stabilization network and dividing potential drop coefficient, and can pass through verification experimental verification the method
Correctness and reliability, Electro Magnetic Compatibility conducted emission technical field.
Background technology
In Electro Magnetic Compatibility conduction transmitting test, due to test specimen connected dissimilar, the resistance of the power supply of diverse location
Anti-excursion is big, and the load end impedance variation causing test specimen is violent, directly affects the survey of test specimen power line conducted emission
Test result.Power line conduction transmitting test result in order to make different place record has comparability, conducts in Electro Magnetic Compatibility
Emission test standard introduces linear impedance stabilization network (hereinafter referred to as LISN, Line Impedance
stabilization network).LISN is otherwise known as artificial mains network (AMN, Artificial mains
Network), it is one of most important test equipment in conduction transmitting test.
The essence of LISN is coupling/decoupling circuit, and it mainly has following three effect in conduction transmitting test: (1) exists
There is provided one to test specimen power input in working frequency range and stablize impedance；(2) by the interference voltage of test specimen power input
It is coupled on Electromagnetic Launching test equipment；(3) by the interference letter of the interference voltage of test specimen power input with power supply end
Number keep apart, prevent power supply end interference signal to be coupled in test equipment cause device damage, meanwhile, prevent test specimen electricity
The interference signal of source input is coupled in power supply affect other electrical equipments.
Complex electronic equipment, before being formally delivered for use, will carry out greatly forcing electromagnetic compatibility test detection, and reach
The requirement that test standard specifies.Function according to LISN and the effect in electromagnetic compatibility test, can analyze, LISN's
Output impedance and dividing potential drop coefficient are to affect one of most important factor of result of the test.When the non-50 ohm of couplings of the impedance of LISN circuit
Time, only computational analysis goes out LISN impedance of different frequent points in its working frequency range, could be modified result of the test.In reality
During the test of border, the capacitance in LISN circuit can carry out dividing potential drop to test specimen port interference voltage, and therefore, receiver is actual to be connect
The voltage signal that receives also is not equal to the actual interference voltage being coupled out of test specimen, only by dividing LISN dividing potential drop coefficient calculations
Analysis, the actual test result of corrected received machine, just can obtain correct test specimen port interference voltage.In sum, calculate and
Analysis LISN output impedance and dividing potential drop coefficient, for revising conducted emission test result, improve test accuracy, significant.
At present, the LISN basic circuit structure used in laboratory is all referring to from CISPR
(CISPR) about classification and the regulation of LISN in standard CISPR-16-1-2 of the relevant electromagnetic compatibility test equipment promulgated.
According to the difference of circuit structure, LISN is divided into V-structure and Δ type structure, the present invention is directed to the LISN output of V-type circuit structure
Impedance and dividing potential drop coefficient carry out computational analysis verification experimental verification.
Operationally, characteristic impedance changes greatly the LISN that existing standard specifies with frequency, affects test result precision.
Summary of the invention
The technology of the present invention solves problem: in order to improve the problem that existing standard specifies that LISN exists, obtain ideal parameters
The LISN circuit of energy, it is provided that a kind of V-type linear impedance stabilization network output impedance and dividing potential drop coefficient determine method, and to calculating side
Method gives verification experimental verification, and the method has directive function to improving existing standard V-type LISN circuit, it is possible to simplify circuit
Experimental test step, improves the measuring accuracy of circuit.
The present invention provides a kind of V-type linear impedance stabilization network output impedance and dividing potential drop coefficient to determine method, and step is as follows:
Step one: V-type LISN is carried out circuit theory analysis by its function and index；
Analyze the element function of V-type circuit structure LISN, analyze effect and the function of element in circuit, according to analysis result
Determine LISN output impedance and the computational methods of dividing potential drop coefficient.
Step 2: provide the output impedance of V-type LISN and the computational methods of dividing potential drop coefficient according to analysis result；
The output impedance of LISN refers to that test specimen port is to the circuit network impedance of power supply port from LISN circuit,
Dividing potential drop coefficient refers to the capacitance voltage dividing ability to test specimen interference voltage in LISN circuit.Hinder to calculate the output of LISN
Resist and dividing potential drop coefficient, need LISN circuit is carried out align mode connection.When LISN accesses source impedance and load impedance, press
Connecing, according to LISN power input, the signal source that impedance is 50 ohm, power output end connects the matched load that impedance is 50 ohm, connects
It is that 50 ohm of matched loads carry out theoretical analysis and calculation that receipts machine coupling port connects impedance.
Step 3: according to the LISN circuit element parameter of computational analysis calculate the full working frequency range of LISN input impedance and
Dividing potential drop coefficient；
According to the method be given in step 2, the V-type LISN circuit element parameter being actually needed analysis is substituted in formula,
Calculate this LISN at the input impedance of full working frequency range and dividing potential drop coefficient value.
The computing formula of the components and parts of V-type LISN circuit output impedance is such as:
Wherein " // " it is computing formula in parallel, R1//R2It is equal to
Capacitance C in LISN circuit1Dividing potential drop coefficient Г computing formula be:
Γ (dB)=20log10 (V0/Vr)=20log10 [R1//R2+1/jωC1|/(R1//R2)]
(2)
Wherein, ω is the angular frequency of circuit work；R1,R2,R3And L, C1, C2It is respectively the resistance in V-type LISN circuit, electricity
Sense and electric capacity；V0For test specimen actual transmission voltage；VrIt it is the magnitude of voltage that receives of receiver port；Real in order to obtain test specimen
Border emitting voltage V0, need the magnitude of voltage recorded by receiver plus dividing potential drop coefficient Г, V0Computing formula is as follows:
V0(dB)=Γ (dB)+Vr(dB) (3)
Step 4: carrying out actual V-type LISN carrying out computational analysis exporting impedance and the actual measurement of dividing potential drop coefficient, checking is analyzed
The correctness calculated and reliability.
Utilize precise impedance analyser or vector network analyzer, it is also possible to directly use receiver and signal source etc. to survey
V-type LISN through computational analysis is carried out exporting impedance and the test of dividing potential drop coefficient value by examination equipment, and by result of the test and LISN
Output impedance and dividing potential drop coefficient calculations result compare, the checking present invention analyzes correctness and the reliability of method.
The present invention compared with prior art advantage is: one V-type linear impedance stabilization network of the present invention output impedance and
Dividing potential drop coefficient determines method, and passes through correctness and the reliability of verification experimental verification the method.The method in description
Know the LISN of component parameters, can be actual to receiver in process of the test by computational analysis its output impedance and dividing potential drop coefficient
The test specimen interference voltage value measured is modified, and the inventive method has important function to revising conducted emission test result,
To improving conduction transmitting test precision, there is directive significance.Existing V-type LISN mainly utilizes test to verify in the design phase
Designed LISN output impedance and dividing potential drop coefficient index, verification experimental verification Expenses Cost is higher, and hardware condition requires higher.This
The bright method be given instructs the design of V-type LISN theoretically, has saved cost, simplifies testing procedure and improves efficiency, and
And improve the precision of test.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of V-type LISN；
Fig. 2 is checking V-type LISN output impedance and dividing potential drop ratio test layout drawing；
Fig. 3 is measured result and result of calculation correlation curve figure, and left figure is output impedance diagram, right figure dividing potential drop coefficient figure；
Fig. 4 is that one V-type linear impedance stabilization network of the present invention exports impedance and dividing potential drop coefficient determines method and checking stream
Cheng Tu.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
The present invention provides a kind of V-type linear impedance stabilization network output impedance and dividing potential drop coefficient to determine method, according to we
The output impedance of method computational analysis V-type linear impedance stabilization network and dividing potential drop coefficient, and by this analysis method of verification experimental verification
Correctness and reliability, as shown in Figure 4, specifically include following steps:
Step one: V-type LISN is carried out circuit theory analysis by its function and index；
According to international wireless electricity administration committee to the EMC test regulation of LISN circuit, LISN circuit is divided into V
Type and two kinds of structures of Δ type.First to V-type LISN circuit, the output impedance and the dividing potential drop coefficient that show in test by it carry out former
Reason is analyzed.Specific analytical method is according to Dai Weinan-kirchhoff Circuit theory, analyze circuit realizes circuit impedance change and
The components and parts of dividing potential drop index variation, the parameter of these components and parts is how many, proposes V-type LISN circuit counting formula for subsequent step
Parameter Conditions is provided；
Analyze the element function of V-type circuit structure LISN, analyze effect and the function of element in circuit, according to analysis result
Determine LISN output impedance and the computational methods of dividing potential drop coefficient；
Step 2: provide the output impedance of V-type LISN and the computational methods of dividing potential drop coefficient according to analysis result；
The output impedance of V-type LISN circuit refers to that test specimen port is to the circuit network of power supply port from LISN circuit
Network impedance, dividing potential drop coefficient refers to the capacitance voltage dividing ability to test specimen interference voltage in LISN circuit.Utilize step a pair V
The analysis result of type LISN circuit, proposes to realize the output impedance of V-type LISN and the computing formula of dividing potential drop coefficient.V-type LISN circuit
Principle analysis as it is shown in figure 1, according to the result analyzed in step one, the output impedance of V-type LISN and dividing potential drop coefficient meter in theory
Calculation method and computing formula be:
Operation principle according to LISN circuit shown in Fig. 1 and circuit diagram, it can be deduced that the components and parts of V-type LISN output impedance
Computing formula be such as:
Wherein " // " it is computing formula in parallel, R1//R2It is equal to
In Fig. 1, capacitance C in LISN circuit1Dividing potential drop coefficient formulas be:
Γ (dB)=20log10 (V0/Vr)=20log10 [| R1//R2+1/jwC1|/(R1//R2)]
Wherein, V0For the interference voltage value of test specimen actual transmission, VrIt is the magnitude of voltage that receives of receiver port, therefore,
In order to obtain test specimen actual transmission voltage V0, need the magnitude of voltage recorded by receiver plus dividing potential drop coefficient.
V0(dB)=Γ (dB)+Vr(dB)
Wherein, R1,R2,R3And L, C1, C2It is respectively the resistance in V-type LISN circuit, inductance and electric capacity.Wherein, V0For quilt
The interference voltage value of test product actual transmission, VrIt it is the magnitude of voltage that receives of receiver port.
Step 3: according to the LISN circuit element parameter of computational analysis calculate the full working frequency range of LISN input impedance and
Dividing potential drop coefficient；According to the formula provided in step 2, the V-type LISN circuit components parameter of analysis will be actually needed, including electricity
Resistance in road, inductance, electric capacity etc. substitutes in formula, calculates the output impedance in its operating frequency of V-type LISN and dividing potential drop
Coefficient value.
Step 4: the output impedance of V-type LISN and dividing potential drop coefficient to carrying out computational analysis in step 3 are surveyed, and test
The correctness of card analytical calculation and reliability.Utilize the test equipment such as vector network analyzer and electric impedance analyzer to through calculating
The V-type LISN circuit analyzed carries out exporting impedance and the test of dividing potential drop coefficient, and by the output impedance of result of the test Yu LISN circuit
Comparing with dividing potential drop coefficient calculations result, the checking present invention analyzes correctness and the reliability of method.
Fig. 3 is the comparison curve chart of actual tests result and result of calculation.It can be seen that the actual measurement that solid line represents
The result of calculation curve that result curve and dotted line represent coincide good in test frequency range, and maximum error is less than 3 percent.
Thus it is believed that a kind of V-type linear impedance stabilization network that the present invention is given exports impedance and dividing potential drop coefficient determines that method has
There are higher feasibility and reliability.
It is embodied as step as follows:
(1) choosing the LISN of a V-type circuit structure, circuit structure description be given and circuit parameter, with this
The bright V-type circuit structure LISN schematic diagram be given is corresponding in turn to.The V-type LISN circuit be given according to the present invention exports impedance and divides
The computational methods of pressure coefficient, calculate the LISN that chooses at the output impedance of its operating frequency and dividing potential drop coefficient.
(2) connected mode that the LISN of the V-type circuit structure chosen is given according to Fig. 2 and electric impedance analyzer and vector net
Network analyser connects, regulation electric impedance analyzer and the setting of vector network analyzer, the output impedance of test V-type LISN circuit and
Dividing potential drop coefficient.
(3) contrast measured result and result of calculation, the feasibility of checking the inventive method and reliability.
Claims (1)
1. a V-type linear impedance stabilization network output impedance and dividing potential drop coefficient determine method, it is characterised in that be embodied as:
Step one, determines the output impedance of V-type LISN circuit and dividing potential drop coefficient formulas；
The computing formula of the components and parts of V-type LISN circuit output impedance is such as:
Wherein " // " it is computing formula in parallel, R1//R2It is equal to
Capacitance C in LISN circuit1Dividing potential drop coefficient Г computing formula be:
Γ (dB)=20log10 (V0/Vr)=20log10 [| R1//R2+1/jωC1|/(R1//R2)]
(2)
Wherein, ω is the angular frequency of circuit work；R1, R2, R3And L, C1, C2Be respectively the resistance in V-type LISN circuit, inductance and
Electric capacity；V0For test specimen actual transmission voltage；VrIt it is the magnitude of voltage that receives of receiver port；In order to obtain, test specimen is actual to be sent out
Radio pressure V0, need the magnitude of voltage recorded by receiver plus dividing potential drop coefficient Г, V0Computing formula is as follows:
V0(dB)=Γ (dB)+Vr(dB) (3)
Step 2: according to the computing formula be given in step one, will be actually needed the V-type LISN circuit components parameter of analysis,
Including the resistance in circuit, inductance, electric capacity substitutes into respectively in formula (1) and formula (2), calculates V-type LISN respectively in its work
Output impedance on working frequency and dividing potential drop coefficient value.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58186293A (en) * | 1982-04-23 | 1983-10-31 | Nippon Telegr & Teleph Corp <Ntt> | Preventing circuit of incoming and outgoing call collision |
| US6751315B1 (en) * | 1999-10-18 | 2004-06-15 | Silicon Labs Isolation, Inc. | High bandwidth phone line transceiver with capacitor isolation |
| CN104678189A (en) * | 2015-02-15 | 2015-06-03 | 华北电力大学（保定） | EMI-filter-based electromagnetic interference noise measuring and suppressing system |
-
2016
- 2016-06-29 CN CN201610498283.6A patent/CN106053959B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58186293A (en) * | 1982-04-23 | 1983-10-31 | Nippon Telegr & Teleph Corp <Ntt> | Preventing circuit of incoming and outgoing call collision |
| US6751315B1 (en) * | 1999-10-18 | 2004-06-15 | Silicon Labs Isolation, Inc. | High bandwidth phone line transceiver with capacitor isolation |
| CN104678189A (en) * | 2015-02-15 | 2015-06-03 | 华北电力大学（保定） | EMI-filter-based electromagnetic interference noise measuring and suppressing system |
Non-Patent Citations (1)
| Title |
|---|
| 姜宁秋: "基于新能源电能变换装置的电磁兼容关键技术研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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