CN112881845B - Device and method for measuring conduction emission current of ECU signal wire - Google Patents
Device and method for measuring conduction emission current of ECU signal wire Download PDFInfo
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- CN112881845B CN112881845B CN202110103578.XA CN202110103578A CN112881845B CN 112881845 B CN112881845 B CN 112881845B CN 202110103578 A CN202110103578 A CN 202110103578A CN 112881845 B CN112881845 B CN 112881845B
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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
- G01R31/002—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing where the device under test is an electronic circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The invention discloses a device and a method for measuring conduction emission current of an ECU signal wire. The power supply box is connected with an ECU (electronic control unit) through a power supply line, and the ECU is connected with a load through a signal line; the power supply line penetrates through the magnetic ring, and the signal line penetrates through the magnetic ring or winds around the magnetic ring. The method can be used for solving the requirement of the current detection equipment verified by the current rectification measure in the early stage, reduces a large amount of time and cost, has the characteristics of low price and simplicity in operation and maintenance, and is beneficial to realizing convenient, accurate and quick test.
Description
Technical Field
The invention belongs to a device and a method for measuring current in the field of electromagnetic emission, and particularly relates to a device and a method for measuring transmission current conducted by an ECU signal wire.
Background
Electromagnetic compatibility (EMC) tests are tests that must be performed by an on-board product. The conduction emission current method is one of the included items, and is mainly used for measuring the electromagnetic energy contained in a cable connected with an automobile part.
When the problem rectification and verification of the designed automobile electronic product is carried out in the early stage by a conduction emission current method, the verification of rectification measures is usually verified by going to a professional electromagnetic compatibility laboratory due to the lack of current detection equipment. This has the following disadvantages: 1. the test verification cost is high by 2, the verification period is long, and the product verification progress is influenced.
Disclosure of Invention
To solve the problems in the background art, it is an object of the present invention to provide an apparatus and method for measuring a conducted emission current of a signal line.
The technical scheme of the invention is realized as follows:
1. an apparatus for measuring the conduction emission current of an ECU signal wire:
the device comprises a magnetic ring, a coil and a spectrum analyzer, wherein the coil is wound on the magnetic ring, two ends of the coil are connected to the spectrum analyzer, a power supply box is connected with a power supply port of an ECU (electronic control unit) through a power supply line, and a signal output port of the ECU is connected with a load through a signal line; the power supply line penetrates through the magnetic ring, and the signal line penetrates through the magnetic ring or winds around the magnetic ring.
The magnetic ring type magnetic field sensor also comprises a signal generator and a cement resistor, wherein the signal generator is connected with the cement resistor through a signal loop, one of the signal loops penetrates through the magnetic ring, and the other signal loop does not penetrate through the magnetic ring and does not wind around the magnetic ring.
The ECU is provided with a plurality of signal ports, and each signal port is connected with one signal port.
In the testing device, the magnetic ring is tested in advance to obtain the transfer impedance: connecting a signal generator with two ends of a cement resistor through two cables, wherein one of the two cables penetrates through a magnetic ring; and obtaining a voltage spectrum distribution diagram at two ends of the coil on the magnetic ring through a spectrum analyzer, and then converting and converting to obtain a transfer impedance spectrum distribution diagram of the magnetic ring.
2. A method of measuring an ECU signal line conduction emission current, comprising the steps of:
the method comprises the following steps: the power supply box is connected with the ECU through a power supply line, the ECU is connected with a load through a signal line, the power supply line and the signal line penetrate through the magnetic ring, and in this state, two ends of a coil on the magnetic ring obtain a first voltage spectrum distribution diagram through the spectrum analyzer;
step two: dividing the numerical value of each same frequency point in the first voltage frequency spectrum distribution graph obtained in the step one and the transfer impedance frequency spectrum distribution graph of the magnetic ring by 2 to obtain a common-mode current frequency spectrum energy distribution graph;
step three: keeping the conditions that the power supply box in the step one is connected with the ECU through the power supply line and the ECU is connected with the load through a signal line unchanged, wherein the power supply line penetrates through the magnetic ring, and the signal line is wound on one side of the magnetic ring, so that a second voltage spectrum distribution diagram is obtained at two ends of a coil on the magnetic ring through the spectrum analyzer in the state;
step four: dividing the numerical value of each same frequency point in the second voltage spectrum distribution diagram obtained in the step three and the transfer impedance spectrum distribution diagram of the magnetic ring by 2 to obtain a differential mode current spectrum energy distribution diagram;
step five: comparing the common mode current spectrum energy distribution graph obtained in the step two and the differential mode current spectrum energy distribution graph obtained in the step four with a current amplitude spectrum on a lead measured by a transmission current method to obtain a result whether a current signal line between the ECU and the load is a main transmission source;
if the current source is a main emission source, checking the frequency spectrum of the current method and the frequency spectrum acquired by the device, judging whether the current amplitude difference is less than 10dBuA in the frequency band range, and modifying according to the judgment result;
if the emission source is not the main emission source, checking the frequency spectrum of the current method and the frequency spectrum acquired by the device, judging whether the current amplitude difference is greater than 15dBuA or not in the frequency band range, and modifying according to the judgment result;
step six: and connecting the ECU with a load through another different signal line, and repeating the steps under the connection state of each signal line to obtain the result whether each signal line of the ECU is a main emission source.
The transfer impedance frequency spectrum distribution diagram of the magnetic ring is obtained by adopting the following method: connecting a signal generator with two ends of a cement resistor through two cables, wherein one of the two cables penetrates through a magnetic ring; and obtaining a voltage spectrum distribution diagram at two ends of the coil on the magnetic ring through a spectrum analyzer, and then converting and converting to obtain a transfer impedance spectrum distribution diagram of the magnetic ring.
The measuring device of the invention is that a coil with a certain number of turns is wound on a magnetic ring to form the secondary of a transformer. The signal line cable to be measured passes through the magnetic loop and serves as the primary of the transformer, and when there is a current in the primary, there is a magnetic field around it, which induces a current in the secondary, which generates a voltage at the input port of the spectrum analyzer. And according to the measured voltage and the transfer resistance curve of the magnetic ring. The current converted into the current on the cable can be calculated. The current data obtained by the device is analyzed, and the test by an electromagnetic compatibility conduction emission current method of the automobile electronic product is facilitated.
The invention has the positive effects that:
the method can be used for solving the requirement of the current detection equipment for the verification of the adjustment and modification measures of the early-stage current method. Compared with the test verification in a professional electromagnetic compatibility laboratory, the device reduces a large amount of time and cost, has the characteristics of low price and simplicity in operation and maintenance, and realizes convenient, accurate and quick test.
Drawings
FIG. 1 is a schematic diagram of the magnetic ring transfer impedance measurement connection of the apparatus of the present invention;
FIG. 2 is a schematic view of the direction of winding coils in a magnetic ring of the apparatus of the present invention;
FIG. 3 is a graph of the transfer impedance measurement of the magnetic ring of the embodiment of the invention;
FIG. 4 is a schematic diagram of the common mode current measurement connection of the apparatus of the present invention;
FIG. 5 is a schematic diagram of the differential mode current measurement connection of the apparatus of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
The embodiment of the invention and the implementation process thereof are as follows:
the method comprises the following steps: as shown in the attached figure 1, a signal generator 7 is connected with two ends of a cement resistor 6 through two cables, the cement resistor is 50 omega, and one of the two cables penetrates through a magnetic ring 4; and obtaining a voltage spectrum distribution diagram at two ends of the coil 10 on the magnetic ring 4 through a spectrum analyzer, and then converting and converting to obtain a transfer impedance spectrum distribution diagram of the magnetic ring 4. Both ends of the coil 10 are connected to the spectrum analyzer 3.
The measurement of the transfer impedance of the magnetic ring 4 is exemplified below. The amplitude of the output voltage of the signal generator 7 is adjusted to 0dBm, which is equal to the output voltage 224mV, and the current generated on the cement resistor 50 omega 6 load is 73dB muA, and then the output voltage of each frequency point in the corresponding frequency band range on the spectrum analyzer 3 is read out in dB muV units. The test is a series loop, the current magnitude of which is equal for each frequency point in the magnetic loop 4, but the magnetic loop 4 presents different impedance for each frequency point. According to the spectrum analyzer 3, the voltage amplitude of the frequency point is divided by the loop current, and then the transfer impedance of each frequency point can be obtained. The calculation formula is as follows: z (dB Ω) = V (dBuV) -73 (dBuA), where Z represents the magnitude of transfer impedance corresponding to each frequency point, and the unit is ohm, V represents the magnitude of voltage amplitude corresponding to each frequency point collected by the spectrum analyzer, 73 represents the magnitude of current in the dc loop, and the calculation formula is: 20lg (224000 uV/50 Ω/1 uA) =73dB μ A.
Finally, the transfer impedance curve of the magnetic ring 4 is obtained, as shown in fig. 3.
Step two: as shown in fig. 4, the power supply box 2 is connected with the ECU electronic control unit 1 through a power supply line 9, the ECU electronic control unit 1 is connected with the load 5 through a signal line 8, the power supply line 9 and the signal line 8 pass through the magnetic ring 4 but do not pass around the magnetic ring 4, the ground line in the power supply line 9 passes through the magnetic ring 4, the magnetic ring 4 simultaneously passes through the ground line in the power supply line 9 and the signal line 8, and the coil 10 is connected with the spectrum analyzer 3.
Because the differential currents are equal in magnitude and opposite in direction, the magnetic lines formed by the two lines are opposite in direction in the connection mode of fig. 4, and cancel out in the magnetic ring 4, and only the common mode current component remains. Subtracting the values of the frequency bands corresponding to the two frequency bands in the transfer impedance spectrum distribution diagram of the used magnetic ring 4 from the voltage spectrum distribution diagram obtained by the spectrum analyzer 3, wherein the formula is as follows, I (dBuA) = V (dBuV) -Z (dB Ω), wherein Z represents the size of transfer impedance corresponding to each frequency point on the transfer impedance spectrum, V represents the size of voltage amplitude corresponding to each frequency point acquired by the spectrum analyzer, and I represents the size of current amplitude corresponding to each frequency point; and obtaining a total common mode current frequency spectrum energy distribution graph of two lines passing through the magnetic ring 4, wherein the common mode current frequency spectrum energy in the signal line 8 is half of the total common mode current frequency spectrum energy, and after the common mode current frequency spectrum energy is halved, two ends of a coil 10 on the magnetic ring 4 are enabled to obtain a first voltage frequency spectrum distribution graph through a spectrum analyzer.
Step three: as shown in fig. 5, in the first step, the condition that the power supply box 2 is connected with the ECU electronic control unit 1 through the power supply line 9 and the ECU electronic control unit 1 is connected with the load 5 through the signal line 8 is kept unchanged, the power supply line 9 passes through the magnetic ring 4 but does not pass through the magnetic ring 4, the ground line in the power supply line 9 passes through the magnetic ring 4, the signal line 8 passes through one side of the magnetic ring 4, and the signal line 8 firstly passes through the upper part of the magnetic ring 4 to the lower part of the magnetic ring 4 and then returns to the upper part of the magnetic ring 4 to directly extend and be connected to the load 5, so that the winding of the signal line 8 is reverse winding, and the coil 10 is connected with the spectrum analyzer 3.
Because the common mode currents are equal in magnitude and opposite in direction, for the connection mode of fig. 5, the magnetic lines of force formed by the two lines are opposite in direction and are offset in the magnetic ring 4, and only the differential mode current component is left. Subtracting the values of the frequency bands corresponding to the two frequency bands in the transfer impedance spectrum distribution diagram of the used magnetic ring 4 from the voltage spectrum distribution diagram obtained by the spectrum analyzer 3, wherein I (dBuA) = V (dBuV) -Z (dB omega), I represents the magnitude of the current amplitude corresponding to each frequency point, V represents the magnitude of the voltage amplitude corresponding to each frequency point acquired by the spectrum analyzer, and Z represents the magnitude of the transfer impedance corresponding to each frequency point on the transfer impedance spectrum; the total differential mode current spectrum energy distribution diagram of two lines passing through the magnetic ring 4 is obtained. The two lines of differential mode currents are equal in magnitude, the differential mode current spectrum energy of the signal line 8 is half of the total differential mode current spectrum energy, and after the differential mode current spectrum energy is halved, the two ends of the coil 10 on the magnetic ring 4 pass through the spectrum analyzer to obtain a second voltage spectrum distribution diagram.
Step five: comparing the common mode current spectrum energy distribution graph obtained in the step two and the differential mode current spectrum energy distribution graph obtained in the step four with a current amplitude spectrum on a lead measured by a conduction emission current method to obtain a result of whether a current signal line 8 between the ECU (electronic control unit) 1 and the load 5 is a main emission source or not;
if the emission source is the main emission source, the current amplitude difference between the current method frequency spectrum and the frequency spectrum acquired by the device is less than 10dBuA in the concerned frequency band range;
if the emission source is not the main emission source, the difference between the current method frequency spectrum and the frequency spectrum acquired by the device is larger than 15dBuA in the current amplitude value within the concerned frequency range;
necessary filtering measures are added for the signal line after positioning.
And finally, repeating the second step and the third step to verify whether the rectification measure reduces the conduction current noise.
Step six: the ECU (1) is connected with the load (5) through another different signal line (8), the steps are repeated under the connection state of each signal line (8), and whether each signal line (8) of the ECU (1) is a main emission source or not is obtained and the result is rectified.
Claims (2)
1. A method for measuring the conduction emission current of an ECU signal wire is characterized in that: the method adopts a device for measuring the transmission current conducted by an ECU signal wire, the device comprises a magnetic ring (4), a coil (10) and a spectrum analyzer (3), the coil (10) is wound on the magnetic ring (4), two ends of the coil (10) are connected to the spectrum analyzer (3), a power supply box (2) is connected with a power supply port of an ECU electric control unit (1) through a power supply line (9), and a signal output port of the ECU electric control unit (1) is connected with a load (5) through a signal wire (8); the power supply line (9) penetrates through the magnetic ring (4), and the signal line (8) penetrates through the magnetic ring (4) or winds around the magnetic ring (4); the device also comprises a signal generator (7) and a cement resistor (6), wherein the signal generator (7) is connected with the cement resistor (6) through a signal loop, one of the signal loops penetrates through the magnetic ring (4), and the other signal loop does not penetrate through the magnetic ring (4) and does not wind around the magnetic ring (4);
the method comprises the following steps:
the method comprises the following steps: the power supply box (2) is connected with the ECU (1) through a power supply line (9), the ECU (1) is connected with a load (5) through a signal line (8), the power supply line (9) and the signal line (8) penetrate through the magnetic ring (4), and in this state, a first voltage spectrum distribution diagram is obtained at two ends of a coil (10) on the magnetic ring (4) through a spectrum analyzer;
step two: dividing the numerical value of each same frequency point in the first voltage frequency spectrum distribution graph obtained in the step one and the transfer impedance frequency spectrum distribution graph of the magnetic ring (4) by 2 to obtain a common-mode current frequency spectrum energy distribution graph;
step three: keeping the conditions that the power supply box (2) is connected with the ECU (1) through a power supply line (9) and the ECU (1) is connected with a load (5) through a signal line (8) unchanged, wherein the power supply line (9) penetrates through the magnetic ring (4), and the signal line (8) winds one side of the magnetic ring (4), so that a second voltage spectrum distribution diagram is obtained at two ends of a coil (10) on the magnetic ring (4) through a spectrum analyzer;
step four: dividing the numerical value of each same frequency point in the second voltage frequency spectrum distribution graph obtained in the step three and the transfer impedance frequency spectrum distribution graph of the magnetic ring (4) by 2 to obtain a differential mode current frequency spectrum energy distribution graph;
step five: comparing the common mode current spectrum energy distribution graph obtained in the step two and the differential mode current spectrum energy distribution graph obtained in the step four with a current amplitude spectrum on a lead measured by a transmission current method to obtain a result whether a current signal line (8) between the ECU (1) and the load (5) is a main transmission source or not;
if the emission source is a main emission source, checking a frequency spectrum of a current method and a frequency spectrum acquired by the device, and judging whether the current amplitude difference is less than 10dBuA or not in the frequency band range;
if the emission source is not the main emission source, checking the frequency spectrum of the current method and the frequency spectrum acquired by the device, and judging whether the current amplitude difference is larger than 15dBuA or not in the frequency band range;
step six: the ECU (1) is connected with a load (5) through another different signal line (8), the steps are repeated under the connection state of each signal line (8), and whether each signal line (8) of the ECU (1) is a main emission source or not is obtained.
2. A method of measuring an ECU signal line conducted emission current according to claim 1, characterized in that: the transfer impedance frequency spectrum distribution diagram of the magnetic ring (4) is obtained by adopting the following method: connecting a signal generator (7) with two ends of a cement resistor (6) through two cables, wherein one of the two cables penetrates through a magnetic ring (4); and obtaining a voltage spectrum distribution diagram at two ends of the coil (10) on the magnetic ring (4) through a spectrum analyzer, and then converting and converting to obtain a transfer impedance spectrum distribution diagram of the magnetic ring (4).
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| CN202110103578.XA CN112881845B (en) | 2021-01-26 | 2021-01-26 | Device and method for measuring conduction emission current of ECU signal wire |
| PCT/CN2021/101430 WO2022160572A1 (en) | 2021-01-26 | 2021-06-22 | Apparatus and method for measuring conducted emission current of ecu signal line |
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| CN202110103578.XA CN112881845B (en) | 2021-01-26 | 2021-01-26 | Device and method for measuring conduction emission current of ECU signal wire |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943769A (en) * | 1989-03-21 | 1990-07-24 | International Business Machines Corporation | Apparatus and method for opens/shorts testing of capacitively coupled networks in substrates using electron beams |
| JPH07134155A (en) * | 1993-11-11 | 1995-05-23 | Meidensha Corp | Heat generation detecting device |
| CN101782637A (en) * | 2010-03-16 | 2010-07-21 | 南京航空航天大学 | Radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application |
| CN101871975A (en) * | 2010-06-21 | 2010-10-27 | 中国人民解放军理工大学 | System and method for testing cable transfer impedance time domain |
| CN101887095A (en) * | 2010-07-01 | 2010-11-17 | 苏州泰思特电子科技有限公司 | Method for testing radiated noises of digital gravity metering device |
| CN102313851A (en) * | 2011-06-30 | 2012-01-11 | 重庆大学 | Method for testing electromagnetic interference propagation path of motor drive system of pure electric vehicle |
| CN103823127A (en) * | 2014-03-19 | 2014-05-28 | 西南交通大学 | Conductive common-mode/differential-mode noise separation method |
| US10235523B1 (en) * | 2016-05-10 | 2019-03-19 | Nokomis, Inc. | Avionics protection apparatus and method |
| CN211653016U (en) * | 2019-11-28 | 2020-10-09 | 浙江亚太机电股份有限公司 | Device for checking electromagnetic radiation standard exceeding emission source of vehicle-mounted system |
| CN111781457A (en) * | 2020-07-24 | 2020-10-16 | 上海擎度汽车科技有限公司 | Test system and method for EMC conduction emission of electronic product |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3423498B2 (en) * | 1995-09-08 | 2003-07-07 | 株式会社リコー | Near magnetic field probe for EMC and method of manufacturing the same |
| CN101093235A (en) * | 2007-07-20 | 2007-12-26 | 南京师范大学 | System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method |
| CN102749539B (en) * | 2012-06-27 | 2014-06-18 | 北京航空航天大学 | Fast electromagnetic compatibility test and diagnosis system with quantization electromagnetic interference |
| CN106526390A (en) * | 2016-12-23 | 2017-03-22 | 安徽华东光电技术研究所 | Electronic compatible EMC conduction simple test method |
| CN107478920A (en) * | 2017-05-23 | 2017-12-15 | 东风特汽（十堰）专用车有限公司 | New-energy automobile radiation disturbance risk assessment easily-testing system |
| CN108957192B (en) * | 2018-07-26 | 2021-03-23 | 北京经纬恒润科技股份有限公司 | Electromagnetic interference diagnosis system and method |
| CN112881845B (en) * | 2021-01-26 | 2022-11-04 | 浙江亚太机电股份有限公司 | Device and method for measuring conduction emission current of ECU signal wire |
-
2021
- 2021-01-26 CN CN202110103578.XA patent/CN112881845B/en active Active
- 2021-06-22 WO PCT/CN2021/101430 patent/WO2022160572A1/en active Application Filing
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943769A (en) * | 1989-03-21 | 1990-07-24 | International Business Machines Corporation | Apparatus and method for opens/shorts testing of capacitively coupled networks in substrates using electron beams |
| JPH07134155A (en) * | 1993-11-11 | 1995-05-23 | Meidensha Corp | Heat generation detecting device |
| CN101782637A (en) * | 2010-03-16 | 2010-07-21 | 南京航空航天大学 | Radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application |
| CN101871975A (en) * | 2010-06-21 | 2010-10-27 | 中国人民解放军理工大学 | System and method for testing cable transfer impedance time domain |
| CN101887095A (en) * | 2010-07-01 | 2010-11-17 | 苏州泰思特电子科技有限公司 | Method for testing radiated noises of digital gravity metering device |
| CN102313851A (en) * | 2011-06-30 | 2012-01-11 | 重庆大学 | Method for testing electromagnetic interference propagation path of motor drive system of pure electric vehicle |
| CN103823127A (en) * | 2014-03-19 | 2014-05-28 | 西南交通大学 | Conductive common-mode/differential-mode noise separation method |
| US10235523B1 (en) * | 2016-05-10 | 2019-03-19 | Nokomis, Inc. | Avionics protection apparatus and method |
| CN211653016U (en) * | 2019-11-28 | 2020-10-09 | 浙江亚太机电股份有限公司 | Device for checking electromagnetic radiation standard exceeding emission source of vehicle-mounted system |
| CN111781457A (en) * | 2020-07-24 | 2020-10-16 | 上海擎度汽车科技有限公司 | Test system and method for EMC conduction emission of electronic product |
Non-Patent Citations (2)
| Title |
|---|
| 全SiC三相逆变器传导电磁干扰建模与预测;段卓琳等;《电工电能新技术》;20180131;第37卷(第01期);第1-7页 * |
| 汽车电子控制器电磁干扰预测试平台的建立;张戟等;《汽车技术》;20091224(第12期);第40-45页 * |
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| WO2022160572A1 (en) | 2022-08-04 |
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