CN113933637A - Power line conduction emission semi-physical simulation method using vector network analyzer - Google Patents
Power line conduction emission semi-physical simulation method using vector network analyzer Download PDFInfo
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- CN113933637A CN113933637A CN202111280124.6A CN202111280124A CN113933637A CN 113933637 A CN113933637 A CN 113933637A CN 202111280124 A CN202111280124 A CN 202111280124A CN 113933637 A CN113933637 A CN 113933637A
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- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 239000000523 sample Substances 0.000 claims abstract description 14
- 238000001228 spectrum Methods 0.000 claims abstract description 5
- 238000013461 design Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000009533 lab test Methods 0.000 abstract description 3
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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
- 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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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Abstract
The invention provides a power line conducted emission semi-physical simulation method by using a vector network analyzer. The method comprises the steps of testing before a power line filter is installed on an EUT, measuring S parameters of a tested object and the power line filter in a testing frequency by using a vector network analyzer, importing an obtained S parameter model into radio frequency circuit simulation software, connecting the tested object with the power line filter, connecting the power line filter with a power supply, respectively connecting a voltage probe and a current probe of a spectrum analyzer between the power line filter and the power supply, and conducting transmission simulation test of a power line by using the radio frequency circuit simulation software. The invention combines the physical test with the simulation software, abandons the complex EUT modeling work and the professional electromagnetic compatibility laboratory test work, ensures that the product fully and effectively demonstrates the power line conducted emission value of the product in the early stage of design under the condition of not having the electromagnetic compatibility laboratory test, and reduces the time and the price cost of the design and the modification of the filter.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility tests, in particular to a power line conducted emission simulation method in a GJB 151B-2013.
Background
Under the condition that the battlefield environment and the electromagnetic environment inside the weapon are more and more complex, the weapon equipment has requirements on the electromagnetic compatibility and adopts test examination. The current military standard adopted by the electromagnetic compatibility test of the national weaponry is GJB 151B-2013: the standard provides for the electromagnetic Emission (EMI) and electromagnetic susceptibility (EMS) requirements and testing of military equipment and subsystems in China. A total of 21 tests of Conducted Emission (CE), Radiated Emission (RE), Conducted Sensitivity (CS) and Radiated Sensitivity (RS) are specified in the GJB 151B-2013. Where the CE101 project is referred to collectively as 25Hz-10KHz power line conducted transmission and the CE102 project is referred to collectively as 10KHz-10MHz power line conducted transmission, the objective is to test the level of interference in the power line of a test article (EUT), which is generated internally in the EUT, coupled to the power line by various means, and then measured by a receiver. Power line conducted emissions are one of the least easily passed items in the EUT electromagnetic compatibility test, and are typically passed by modifying a power line filter installed inside the EUT.
According to the requirements of GJB151B-2013, instrument equipment such as a shielding room, a linear impedance matching network (LISN), an attenuator, a current probe and an EMI receiver is required for conducting a power line conducted emission test, so the test is generally carried out in a professional electromagnetic compatibility laboratory. When the EUT does not pass the test, it must be modified on site, which is time consuming, labor intensive and costly. One of the development trends in the electromagnetic compatibility industry is to perform electromagnetic compatibility simulation, but due to the modeling difficulty and the simulation complexity, no comprehensive simulation solution for the project test in the GJB151B-2013 exists at home and abroad. There is therefore a need for a testing method that enables an enterprise to conduct power line conducted emission tests without a specialized electromagnetic compatibility laboratory, and whose results can guide power line filter design and modification.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a power line conduction emission semi-physical simulation method by using a vector network analyzer. The invention designs a power line conducted emission semi-physical simulation test method by using a vector network analyzer, which is used for testing before a power line filter is installed to an EUT,
the technical scheme adopted by the invention for solving the technical problem comprises the following steps:
step 1): enabling a tested article to work in a technical state required in an actual test, taking a power line (including a return line) of the tested article as an input end, taking the tested article as a single-port network, and measuring an S parameter of the tested article in a test frequency by using a vector network analyzer;
step 2): taking the power line filter as a dual-port network, and measuring the S parameter of the power line filter in the test frequency by using a vector network analyzer;
step 3): and (2) importing the S parameter models of the tested object and the power line filter obtained in the steps 1) and 2) into radio frequency circuit simulation software, connecting the tested object with the power line filter, connecting the power line filter with a power supply, respectively connecting a voltage probe and a current probe of the spectrum analyzer between the power line filter and the power supply, and performing power line conduction emission simulation test by using the radio frequency circuit simulation software.
The radio frequency circuit simulation software adopts ADS.
The invention has the advantages that the physical test is combined with simulation software, complex EUT modeling work and professional electromagnetic compatibility laboratory test work are abandoned, the vector network analyzer is directly used for measuring the S parameters of the EUT and the power line filter, and then the radio frequency circuit simulation analysis software is combined for conducting and transmitting test of the power line. The product is designed earlier, and under the test condition of a laboratory without electromagnetic compatibility, the power line conduction emission quantity value of the product can be fully and effectively demonstrated, and the time and price cost of filter design and rectification are greatly reduced.
Drawings
Fig. 1 is a diagram showing the measurement of the S parameter of the sample and the filter according to the present invention.
FIG. 2 is a circuit simulation block diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
A product with a dc 28V supply fails the CE101 and CE102 tests and the power line filter is now modified using the method of the present invention, as shown in fig. 1.
Step 1): taking down the power line filter, enabling the tested product to work in a state required in actual test, taking the 28V input line and the return line of the product as a port, and measuring the S parameter of the tested product in 25Hz-10MHz by using a vector network analyzer;
step 2): taking the power line filter as a dual-port network, and measuring the S parameter of the power line filter within 25Hz-10MHz by using a vector network analyzer;
step 3): the S parameter model of the tested object and the power line filter is introduced into radio frequency circuit simulation software ADS, and a 28V power supply, a current probe, a voltage probe and a spectrum analyzer are added, as shown in FIG. 2. Setting the frequency of a voltage probe to be 10KHz-10MHz, setting the frequency of a current probe to be 25Hz-10KHz, and setting the frequency of a spectrum analyzer to be 25Hz-10 MHz. And obtaining test curve graphs of the CE101 and the CE102 through the current probe and the voltage probe after the simulation is finished.
Multiple tests are performed as needed to optimize and refine the filter.
Claims (2)
1. A power line conduction emission semi-physical simulation method using a vector network analyzer is characterized by comprising the following steps:
step 1): enabling a tested article to work in a technical state required in an actual test, taking a power line (including a return line) of the tested article as an input end, taking the tested article as a single-port network, and measuring an S parameter of the tested article in a test frequency by using a vector network analyzer;
step 2): taking the power line filter as a dual-port network, and measuring the S parameter of the power line filter in the test frequency by using a vector network analyzer;
step 3): and (2) importing the S parameter models of the tested object and the power line filter obtained in the steps 1) and 2) into radio frequency circuit simulation software, connecting the tested object with the power line filter, connecting the power line filter with a power supply, respectively connecting a voltage probe and a current probe of the spectrum analyzer between the power line filter and the power supply, and performing power line conduction emission simulation test by using the radio frequency circuit simulation software.
2. The power line conducted emission semi-physical simulation method using a vector network analyzer according to claim 1, wherein:
the radio frequency circuit simulation software adopts ADS.
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| CN202111280124.6A CN113933637A (en) | 2021-10-28 | 2021-10-28 | Power line conduction emission semi-physical simulation method using vector network analyzer |
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2021
- 2021-10-28 CN CN202111280124.6A patent/CN113933637A/en active Pending
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