WO2022160572A1 - Apparatus and method for measuring conducted emission current of ecu signal line - Google Patents

Apparatus and method for measuring conducted emission current of ecu signal line Download PDF

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WO2022160572A1
WO2022160572A1 PCT/CN2021/101430 CN2021101430W WO2022160572A1 WO 2022160572 A1 WO2022160572 A1 WO 2022160572A1 CN 2021101430 W CN2021101430 W CN 2021101430W WO 2022160572 A1 WO2022160572 A1 WO 2022160572A1
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magnetic ring
signal line
spectrum
current
ecu
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PCT/CN2021/101430
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French (fr)
Chinese (zh)
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马天宇
张�杰
孟宪策
李立刚
董瑛集
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浙江亚太机电股份有限公司
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Publication of WO2022160572A1 publication Critical patent/WO2022160572A1/en

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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
    • 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

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  • the invention belongs to a device and method for measuring current in the field of electromagnetic emission, and in particular relates to a device and method for measuring the conducted emission current of an ECU signal line.
  • Electromagnetic compatibility (EMC) testing is a must for automotive products.
  • the conducted emission current method is one of the included items, which is mainly used to measure the amount of electromagnetic energy contained in cables connected to auto parts.
  • the object of the present invention is to provide a device and method for measuring the conducted emission current of a signal line.
  • a device for measuring the emission current conducted by the ECU signal line is a device for measuring the emission current conducted by the ECU signal line
  • the device includes three parts: a magnetic ring, a coil and a spectrum analyzer.
  • a coil is wound on the magnetic ring. Both ends of the coil are connected to the spectrum analyzer.
  • the power box is connected to the power supply port of the ECU electronic control unit through the power supply line.
  • the signal output port is connected with the load through a signal line; the power supply line is passed through the magnetic ring, and the signal line is passed through the magnetic ring or is wound around the magnetic ring.
  • the signal generator is connected with the cement resistance through a signal loop.
  • One of the signal loops passes through the magnetic ring, and the other does not pass through the magnetic loop and does not go around the magnetic loop.
  • the ECU electronic control unit has a plurality of signal ports, and each signal port is connected to a signal port.
  • the magnetic ring is pre-tested to obtain the transfer impedance: the signal generator is connected to both ends of the cement resistor through two cables, and one of the two cables passes through the magnetic ring; the two ends of the coil on the magnetic ring pass through the spectrum analyzer. The obtained voltage spectrum distribution diagram is converted and converted to obtain the transfer impedance spectrum distribution diagram of the magnetic ring.
  • a method for measuring the conducted emission current of an ECU signal line comprising the following steps:
  • Step 1 The power supply box is connected to the ECU electronic control unit through a power supply line, and the ECU electronic control unit is connected to the load through a signal line.
  • the power supply line and the signal line pass through the magnetic ring. In this state, the two coils on the magnetic ring
  • the terminal obtains the first voltage spectrum distribution diagram through the spectrum analyzer;
  • Step 2 Divide the value of each same frequency point in the first voltage spectrum distribution diagram obtained in step 1 and the transfer impedance spectrum distribution diagram of the magnetic ring by each other and then divide by 2, and then obtain the common mode current spectrum energy distribution diagram;
  • Step 3 Keep the conditions that the power supply box in step 1 is connected to the ECU electronic control unit through a power supply line and the ECU electronic control unit is connected to the load through a signal line.
  • the power supply line passes through the magnetic ring, and the signal line is wound through the magnetic One side of the ring, in this state, the two ends of the coil on the magnetic ring obtain the second voltage spectrum distribution diagram through the spectrum analyzer;
  • Step 4 Divide the value of each same frequency point in the second voltage spectrum distribution diagram obtained in step 3 and the transfer impedance spectrum distribution diagram of the magnetic ring with each other and then divide by 2, and then obtain the differential mode current spectrum energy distribution diagram;
  • Step 5 Compare the common mode current spectral energy distribution obtained in step 2 and the differential mode current spectral energy distribution obtained in step 4 with the current amplitude spectrum on the wire measured by the transmission current method to obtain the ECU electronic control. Whether the current signal line between the unit and the load is the result of the primary source of emission;
  • Step 6 Connect the ECU electronic control unit to the load through another signal line, and repeat the above steps in the connection state of each signal line to obtain whether each signal line of the ECU electronic control unit is the main emission source. result.
  • the transfer impedance spectrum distribution diagram of the magnetic ring is obtained in the following manner: the signal generator is connected to the two ends of the cement resistance through two cables, and one of the two cables passes through the magnetic ring; the two ends of the coil on the magnetic ring pass through.
  • the voltage spectrum distribution diagram obtained by the spectrum analyzer is converted and converted to obtain the transfer impedance spectrum distribution diagram of the magnetic ring.
  • the measuring device of the present invention is to wind a coil with a certain number of turns on a magnetic ring to form the secondary of the transformer.
  • the signal line cable to be measured passes through the magnetic ring as the primary of the transformer.
  • When there is current on the primary there will be a magnetic field around it, which will induce a current on the secondary, and this current will be at the input port of the spectrum analyzer. generate voltage.
  • the current on the converted cable can be calculated.
  • the analysis of the current data obtained by this device will help to pass the test of the electromagnetic compatibility conducted emission current method of automotive electronic products.
  • the present invention can be used to solve the requirement for current detection equipment for the verification of the current method rectification measures in the early stage. Compared with going to a professional electromagnetic compatibility laboratory for testing and verification, the use of the device of the present invention reduces a lot of time and cost, and has the characteristics of low price, simple operation and maintenance, and realizes convenient, accurate and fast testing.
  • FIG. 1 is a schematic diagram of the connection of the magnetic ring transfer impedance measurement of the device of the present invention
  • FIG. 2 is a schematic diagram of the winding direction of the coil in the magnetic ring of the device of the present invention
  • FIG. 3 is a graph showing the measurement result of the transfer impedance of the magnetic ring according to the embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the differential mode current measurement connection of the device of the present invention.
  • Step 1 As shown in Figure 1, connect the signal generator 7 to the two ends of the cement resistance 6 through two cables, the cement resistance adopts 50 ⁇ , and one of the two cables passes through the magnetic ring 4; the coil on the magnetic ring 4 The voltage spectrum distribution diagram obtained by the spectrum analyzer at both ends of 10 is converted and converted to obtain the 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. Adjust the amplitude of the output voltage of the signal generator 7 to 0dBm, which is equal to the output voltage of 224mV, and the current generated by the cement resistance 50 ⁇ 6 load is 73dB ⁇ A, and then read the output voltage of each frequency point in the corresponding frequency range on the spectrum analyzer 3, to obtain The unit is read out in dB ⁇ V.
  • the test is a series loop, and its current magnitude is equal to each frequency point in the magnetic ring 4, but the magnetic ring 4 presents different impedances for each frequency point. Divide the voltage amplitude of the frequency point by the loop current according to the spectrum analyzer 3, and then the transfer impedance of each frequency point can be obtained.
  • Step 2 As shown in Figure 4, the power supply box 2 is connected to the ECU electronic control unit 1 through the power supply line 9, the ECU electronic control unit 1 is connected to the load 5 through a signal line 8, and the power supply line 9 and the signal line 8 pass through.
  • the magnetic ring 4 does not pass through the magnetic ring 4, the ground wire in the power supply wire 9 passes through the magnetic ring 4, the magnetic ring 4 passes through the ground wire and the signal wire 8 in the power supply wire 9 at the same time, and the coil 10 is connected to the spectrum analyzer 3 .
  • the magnetic lines of force formed by the two lines are in opposite directions and cancel in the magnetic ring 4, leaving only the common-mode current component.
  • the voltage spectrum distribution diagram obtained by the spectrum analyzer 3 is subtracted from the values of the corresponding frequency bands in the transfer impedance spectrum distribution diagram of the magnetic ring 4 used.
  • the magnitude of the current amplitude; the total common-mode current spectral energy distribution diagram of the two lines that the magnetic ring 4 passes through, the common-mode current spectral energy in the signal line 8 is half of the total common-mode current spectral energy, After the value is half, the first voltage spectrum distribution diagram is obtained through the spectrum analyzer at both ends of the coil 10 on the magnetic ring 4 .
  • Step 3 As shown in Figure 5, keep the conditions that the power box 2 in step 1 is connected to the ECU electronic control unit 1 via the power supply line 9 and the ECU electronic control unit 1 is connected to the load 5 via a signal line 8.
  • the wire 9 passes through the magnetic ring 4 but does not pass through the magnetic ring 4, the ground wire in the power supply line 9 passes through the magnetic ring 4, the signal wire 8 passes through one side of the magnetic ring 4, and the signal wire 8 passes through the magnetic ring 4 first.
  • the upper part is wound to the bottom of the magnetic ring 4 and then back to the top of the magnetic ring 4 to be directly connected to the load 5 , so that the winding of the signal line 8 is reversed, and the coil 10 is connected to the spectrum analyzer 3 .
  • the size of the transfer impedance get the total differential mode current spectrum energy distribution diagram of the two lines that the magnetic ring 4 passes through.
  • the differential mode currents of the two lines are equal in magnitude, and the differential mode current spectral energy of the signal line 8 is half of the total differential mode current spectral energy. Voltage spectrum distribution.
  • Step 5 Compare the common mode current spectral energy distribution obtained in step 2 and the differential mode current spectral energy distribution obtained in step 4 with the current amplitude spectrum on the wire measured by the transmission current method to obtain the ECU electronic control. Whether the current signal line 8 between unit 1 and load 5 is the result of the main emission source;
  • the current amplitude difference between the current method spectrum and the spectrum collected by the invented device is less than 10dBuA in the frequency range of interest;
  • the current amplitude difference between the current method spectrum and the spectrum collected by the invented device is greater than 15dBuA in the frequency range of interest;
  • Step 6 Connect the ECU electronic control unit 1 to the load 5 through another different signal line 8, repeat the above steps in the connection state of each signal line 8, and obtain the signal lines 8 of the ECU electronic control unit 1. Whether it is the result of the main emission source and rectification processing.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

An apparatus and method for measuring a conducted emission current of an ECU signal line. The apparatus comprises three parts, that is, a magnetic ring (4), a coil (10) and a spectrum analyzer (3), wherein the coil (10) is wound on the magnetic ring (4), and two ends of the coil (10) are connected to the spectrum analyzer (3). A power source box (2) is connected to an electronic control unit (ECU) (1) by means of a power supply line (9), and the ECU (1) is connected to a load (5) by means of a signal line (8); and the power supply line (9) passes through the magnetic ring (4), and the signal line (8) passes through the magnetic ring (4) or passes by the magnetic ring (4). The apparatus can be used for meeting the requirements for a current detection device for the verification of current method rectification measures in the early stage, and reducing a large amount of time and cost, has the characteristics of low cost and simple operation and maintenance, and facilitates convenient, accurate and rapid testing.

Description

测量ECU信号线传导发射电流的装置和方法Device and method for measuring ECU signal line conducted emission current 技术领域technical field
本发明属于电磁发射领域的一种测量电流装置和方法，具体涉及一种测量ECU信号线传导发射电流的装置和方法。The invention belongs to a device and method for measuring current in the field of electromagnetic emission, and in particular relates to a device and method for measuring the conducted emission current of an ECU signal line.
背景技术Background technique
电磁兼容(EMC)测试是车载产品所必须进行的测试。其中传导发射电流法是所包含的项目之一，主要用于测量汽车零部件所连接线缆中包含的电磁能量大小。Electromagnetic compatibility (EMC) testing is a must for automotive products. The conducted emission current method is one of the included items, which is mainly used to measure the amount of electromagnetic energy contained in cables connected to auto parts.
对设计的汽车电子产品，前期进行传导发射电流法问题整改验证时，因缺少电流检测设备，整改措施的验证往往需要去专业的电磁兼容实验室进行验证。这样做存在的缺点：1、测试验证费用高2、验证排期长，影响产品验证进度。For the designed automotive electronic products, when conducting the rectification and verification of the conducted emission current method in the early stage, due to the lack of current detection equipment, the verification of the rectification measures often needs to go to a professional electromagnetic compatibility laboratory for verification. The disadvantages of this method are: 1. High cost of testing and verification; 2. Long verification schedule, which affects the progress of product verification.
发明内容SUMMARY OF THE INVENTION
为了解决背景技术中存在的问题，本发明的目的是提供一种测量信号线传导发射电流的装置和方法。In order to solve the problems existing in the background art, the object of the present invention is to provide a device and method for measuring the conducted emission current of a signal line.
本发明的技术方案是这样实现的：The technical scheme of the present invention is realized as follows:
一、一种测量ECU信号线传导发射电流的装置：1. A device for measuring the emission current conducted by the ECU signal line:
装置包括磁环、线圈和频谱分析仪三部分，磁环上绕制线圈，线圈的两端连接到频谱分析仪，电源盒经供电线和ECU电控单元的供电端口连接，ECU电控单元的信号输出端口经一根信号线和负载连接；所述的供电线穿设过磁环，所述的信号线穿设过磁环或者绕经磁环。The device includes three parts: a magnetic ring, a coil and a spectrum analyzer. A coil is wound on the magnetic ring. Both ends of the coil are connected to the spectrum analyzer. The power box is connected to the power supply port of the ECU electronic control unit through the power supply line. The signal output port is connected with the load through a signal line; the power supply line is passed through the magnetic ring, and the signal line is passed through the magnetic ring or is wound around the magnetic ring.
还包括信号发生器和水泥电阻，信号发生器经信号回路和水泥电阻连接，信号回路的其中一条穿设过磁环，另一条不穿设过磁环也不绕经磁环。It also includes a signal generator and a cement resistance. The signal generator is connected with the cement resistance through a signal loop. One of the signal loops passes through the magnetic ring, and the other does not pass through the magnetic loop and does not go around the magnetic loop.
所述的ECU电控单元具有多个信号端口，每个信号端口均连接一根信号端口。The ECU electronic control unit has a plurality of signal ports, and each signal port is connected to a signal port.
测试装置中，对磁环预先测试获得转移阻抗：将信号发生器通过两根电缆连接水泥电阻的两端，两根电缆的其中一条电缆穿过磁环；磁环上线圈两端通过频谱分析仪得到的电压频谱分布图，再转换换算得到磁环的转移阻抗频谱分布图。In the test device, the magnetic ring is pre-tested to obtain the transfer impedance: the signal generator is connected to both ends of the cement resistor through two cables, and one of the two cables passes through the magnetic ring; the two ends of the coil on the magnetic ring pass through the spectrum analyzer. The obtained voltage spectrum distribution diagram is converted and converted to obtain the transfer impedance spectrum distribution diagram of the magnetic ring.
二、一种测量ECU信号线传导发射电流的方法，包括以下步骤：2. A method for measuring the conducted emission current of an ECU signal line, comprising the following steps:
步骤一：电源盒经供电线和ECU电控单元连接，ECU电控单元经一根信号线和负载连接，所述的供电线和信号线穿设过磁环，这样状态下磁环上线圈 两端通过频谱分析仪得到第一电压频谱分布图；Step 1: The power supply box is connected to the ECU electronic control unit through a power supply line, and the ECU electronic control unit is connected to the load through a signal line. The power supply line and the signal line pass through the magnetic ring. In this state, the two coils on the magnetic ring The terminal obtains the first voltage spectrum distribution diagram through the spectrum analyzer;
步骤二：将步骤一所得到的第一电压频谱分布图与磁环的转移阻抗频谱分布图中每个相同频点的数值相互相除再除以2，进而获得共模电流频谱能量分布图；Step 2: Divide the value of each same frequency point in the first voltage spectrum distribution diagram obtained in step 1 and the transfer impedance spectrum distribution diagram of the magnetic ring by each other and then divide by 2, and then obtain the common mode current spectrum energy distribution diagram;
步骤三：保持步骤一中的电源盒经供电线和ECU电控单元连接以及ECU电控单元经一根信号线和负载连接的条件不变，供电线穿设过磁环，信号线绕经磁环的一侧，这样状态下磁环上线圈两端通过频谱分析仪得到第二电压频谱分布图；Step 3: Keep the conditions that the power supply box in step 1 is connected to the ECU electronic control unit through a power supply line and the ECU electronic control unit is connected to the load through a signal line. The power supply line passes through the magnetic ring, and the signal line is wound through the magnetic One side of the ring, in this state, the two ends of the coil on the magnetic ring obtain the second voltage spectrum distribution diagram through the spectrum analyzer;
步骤四：将步骤三所得到的第二电压频谱分布图与磁环的转移阻抗频谱分布图中每个相同频点的数值相互相除再除以2，进而获得差模电流频谱能量分布图；Step 4: Divide the value of each same frequency point in the second voltage spectrum distribution diagram obtained in step 3 and the transfer impedance spectrum distribution diagram of the magnetic ring with each other and then divide by 2, and then obtain the differential mode current spectrum energy distribution diagram;
步骤五：将步骤二得到的共模电流频谱能量分布图和步骤四得到的差模电流频谱能量分布图，与传到发射电流法所测得的导线上电流幅度谱进行对比，获得ECU电控单元和负载之间的当前信号线是否是主要发射源的结果；Step 5: Compare the common mode current spectral energy distribution obtained in step 2 and the differential mode current spectral energy distribution obtained in step 4 with the current amplitude spectrum on the wire measured by the transmission current method to obtain the ECU electronic control. Whether the current signal line between the unit and the load is the result of the primary source of emission;
若是主要的发射源，则查看电流法频谱与发明设备所采集到的频谱，在所频段范围内判断电流幅值差是否小于10dBuA，根据判断结果进行整改；If it is the main emission source, check the current method spectrum and the spectrum collected by the invented device, judge whether the current amplitude difference is less than 10dBuA within the frequency range, and make corrections according to the judgment result;
若不是主要的发射源，则查看电流法频谱与发明设备所采集到的频谱，在所频段范围内判断电流幅值差是否大于15dBuA，根据判断结果进行整改；If it is not the main emission source, check the spectrum of the current method and the spectrum collected by the invented device, judge whether the current amplitude difference is greater than 15dBuA within the frequency range, and make corrections according to the judgment result;
步骤六：将ECU电控单元经不同的另一根信号线和负载进行连接，在每根信号线连接状态下重复上述步骤，获得ECU电控单元的各根信号线的是否是主要发射源的结果。Step 6: Connect the ECU electronic control unit to the load through another signal line, and repeat the above steps in the connection state of each signal line to obtain whether each signal line of the ECU electronic control unit is the main emission source. result.
所述的磁环的转移阻抗频谱分布图采用以下方式获得：将信号发生器通过两根电缆连接水泥电阻的两端，两根电缆的其中一条电缆穿过磁环；磁环上线圈两端通过频谱分析仪得到的电压频谱分布图，再转换换算得到磁环的转移阻抗频谱分布图。The transfer impedance spectrum distribution diagram of the magnetic ring is obtained in the following manner: the signal generator is connected to the two ends of the cement resistance through two cables, and one of the two cables passes through the magnetic ring; the two ends of the coil on the magnetic ring pass through. The voltage spectrum distribution diagram obtained by the spectrum analyzer is converted and converted to obtain the transfer impedance spectrum distribution diagram of the magnetic ring.
本发明测量装置是在一个磁环上绕上一定匝数的线圈，构成变压器的次级。被测量的信号线电缆穿过磁环，作为变压器的初级，当初级有电流时，其周围就会有磁场，这就会在次级上感应出电流，此电流会在频谱分析仪的输入端口上产生电压。根据测量得到的电压以及磁环的转移电阻曲线。就可以计算转化出电缆上的电流。对此装置所得的电流数据进行分析，有助于通过汽车电子产品电磁兼容传导发射电流法的测试。The measuring device of the present invention is to wind a coil with a certain number of turns on a magnetic ring to form the secondary of the transformer. The signal line cable to be measured passes through the magnetic ring as the primary of the transformer. When there is current on the primary, there will be a magnetic field around it, which will induce a current on the secondary, and this current will be at the input port of the spectrum analyzer. generate voltage. According to the measured voltage and the transfer resistance curve of the magnetic ring. The current on the converted cable can be calculated. The analysis of the current data obtained by this device will help to pass the test of the electromagnetic compatibility conducted emission current method of automotive electronic products.
本发明的积极效果是：The positive effects of the present invention are:
本发明能够用于解决前期电流法整改措施验证对电流检测设备的需求。相 比去专业的电磁兼容实验室进行测试验证，本发明设备的使用减少了大量的时间及费用，并且具有价格低廉、操作和维修简单的特点，实现了便捷、准确、快速的测试。The present invention can be used to solve the requirement for current detection equipment for the verification of the current method rectification measures in the early stage. Compared with going to a professional electromagnetic compatibility laboratory for testing and verification, the use of the device of the present invention reduces a lot of time and cost, and has the characteristics of low price, simple operation and maintenance, and realizes convenient, accurate and fast testing.
附图说明Description of drawings
图1为本发明装置磁环转移阻抗测量连接示意图；1 is a schematic diagram of the connection of the magnetic ring transfer impedance measurement of the device of the present invention;
图2为本发明装置磁环内线圈绕制方向示意图；2 is a schematic diagram of the winding direction of the coil in the magnetic ring of the device of the present invention;
图3为本发明实施例的磁环的转移阻抗测量结果图；FIG. 3 is a graph showing the measurement result of the transfer impedance of the magnetic ring according to the embodiment of the present invention;
图4为本发明装置共模电流测量连接示意图；4 is a schematic diagram of the common mode current measurement connection of the device of the present invention;
图5为本发明装置差模电流测量连接示意图。FIG. 5 is a schematic diagram of the differential mode current measurement connection of the device of the present invention.
具体实施方式Detailed ways
下面结合附图及实施例对本发明作进一步描述。The present invention will be further described below with reference to the accompanying drawings and embodiments.
本发明的实施例及其实施过程如下：The embodiment of the present invention and its implementation process are as follows:
步骤一：如附图1所示，将信号发生器7通过两根电缆连接水泥电阻6的两端，水泥电阻采用50Ω，两根电缆的其中一条电缆穿过磁环4；磁环4上线圈10两端通过频谱分析仪得到的电压频谱分布图，再转换换算得到磁环4的转移阻抗频谱分布图。线圈10的两端连接到频谱分析仪3。Step 1: As shown in Figure 1, connect the signal generator 7 to the two ends of the cement resistance 6 through two cables, the cement resistance adopts 50Ω, and one of the two cables passes through the magnetic ring 4; the coil on the magnetic ring 4 The voltage spectrum distribution diagram obtained by the spectrum analyzer at both ends of 10 is converted and converted to obtain the transfer impedance spectrum distribution diagram of the magnetic ring 4 . Both ends of the coil 10 are connected to the spectrum analyzer 3 .
下面举例说明磁环4的转移阻抗的测量。调节信号发生器7输出电压的幅度为0dBm，这等于输出电压224mV，在水泥电阻50Ω6负载上产生的电流为73dBμA，然后读取频谱分析仪3上对应频段范围内各频点的输出电压，以dBμV的单位读出。测试为串联回路，其电流大小对磁环4中的各个频点是相等的，但磁环4对每个频点呈现不同的阻抗。根据频谱分析仪3将频点的电压幅度与环路电流相除，就可得到各频点的转移阻抗大小。其计算公式如下：Z(dBΩ)＝V(dBuV)-73(dBuA)，Z代表每个频点所对应的的转移阻抗的大小，单位为欧姆，V代表频谱分析仪采集的每个频点所对应的的电压幅值的大小，73表示直流回路中的电流大小，其计算公式为：20lg(224000uV/50Ω/1uA)＝73dBμA。The measurement of the transfer impedance of the magnetic ring 4 is exemplified below. Adjust the amplitude of the output voltage of the signal generator 7 to 0dBm, which is equal to the output voltage of 224mV, and the current generated by the cement resistance 50Ω6 load is 73dBμA, and then read the output voltage of each frequency point in the corresponding frequency range on the spectrum analyzer 3, to obtain The unit is read out in dBµV. The test is a series loop, and its current magnitude is equal to each frequency point in the magnetic ring 4, but the magnetic ring 4 presents different impedances for each frequency point. Divide the voltage amplitude of the frequency point by the loop current according to the spectrum analyzer 3, and then the transfer impedance of each frequency point can be obtained. The calculation formula is as follows: Z(dBΩ)=V(dBuV)-73(dBuA), Z represents the size of the transfer impedance corresponding to each frequency point, in ohms, and V represents each frequency point collected by the spectrum analyzer The magnitude of the corresponding voltage amplitude, 73 represents the magnitude of the current in the DC loop, and its calculation formula is: 20lg(224000uV/50Ω/1uA)=73dBμA.
最终得到磁环4的转移阻抗曲线，如附图3所示。Finally, the transfer impedance curve of the magnetic ring 4 is obtained, as shown in FIG. 3 .
步骤二：如图4所示，电源盒2经供电线9和ECU电控单元1连接，ECU电控单元1经一根信号线8和负载5连接，供电线9和信号线8穿设过磁环4但不绕经磁环4，供电线9中的地线穿过磁环4，磁环4同时穿过供电线9中的地线与信号线8，线圈10连接到频谱分析仪3。Step 2: As shown in Figure 4, the power supply box 2 is connected to the ECU electronic control unit 1 through the power supply line 9, the ECU electronic control unit 1 is connected to the load 5 through a signal line 8, and the power supply line 9 and the signal line 8 pass through. The magnetic ring 4 does not pass through the magnetic ring 4, the ground wire in the power supply wire 9 passes through the magnetic ring 4, the magnetic ring 4 passes through the ground wire and the signal wire 8 in the power supply wire 9 at the same time, and the coil 10 is connected to the spectrum analyzer 3 .
因差分电流大小相等方向相反，对于图4的连接方式，两线形成的磁力线方向相反，在磁环4内抵消，只剩下共模电流成分。将频谱分析仪3所得到电压频谱分布图，与所用磁环4的转移阻抗频谱分布图中两者对应频段的数值相 减，公式如下I(dBuA)＝V(dBuV)-Z(dBΩ)，Z代表转移阻抗频谱上每个频点所对应的的转移阻抗的大小，V代表频谱分析仪采集的每个频点所对应的的电压幅值的大小，I表示代表每个频点所对应的的电流幅值的大小；就得磁环4所包含穿过的两线总的共模电流频谱能量分布图，信号线8中的共模电流频谱能量为总的共模电流频谱能量的一半，在取值一半后，使得磁环4上线圈10两端通过频谱分析仪得到第一电压频谱分布图。Because the differential currents are equal in magnitude and opposite in direction, for the connection method shown in Figure 4, the magnetic lines of force formed by the two lines are in opposite directions and cancel in the magnetic ring 4, leaving only the common-mode current component. The voltage spectrum distribution diagram obtained by the spectrum analyzer 3 is subtracted from the values of the corresponding frequency bands in the transfer impedance spectrum distribution diagram of the magnetic ring 4 used. The formula is as follows: I(dBuA)=V(dBuV)-Z(dBΩ), Z represents the magnitude of the transfer impedance corresponding to each frequency point on the transfer impedance spectrum, V represents the magnitude of the voltage amplitude corresponding to each frequency point collected by the spectrum analyzer, and I represents the magnitude of the voltage corresponding to each frequency point The magnitude of the current amplitude; the total common-mode current spectral energy distribution diagram of the two lines that the magnetic ring 4 passes through, the common-mode current spectral energy in the signal line 8 is half of the total common-mode current spectral energy, After the value is half, the first voltage spectrum distribution diagram is obtained through the spectrum analyzer at both ends of the coil 10 on the magnetic ring 4 .
步骤三：如图5所示，保持步骤一中的电源盒2经供电线9和ECU电控单元1连接以及ECU电控单元1经一根信号线8和负载5连接的条件不变，供电线9穿设过磁环4但不绕经磁环4，供电线9中的地线穿过磁环4，信号线8绕经磁环4的一侧，且信号线8先经磁环4上方绕到磁环4下方后再绕回到磁环4上方进而直接延伸连接到负载5，使得信号线8的绕制为反向绕制，线圈10连接连接频谱分析仪3。Step 3: As shown in Figure 5, keep the conditions that the power box 2 in step 1 is connected to the ECU electronic control unit 1 via the power supply line 9 and the ECU electronic control unit 1 is connected to the load 5 via a signal line 8. The wire 9 passes through the magnetic ring 4 but does not pass through the magnetic ring 4, the ground wire in the power supply line 9 passes through the magnetic ring 4, the signal wire 8 passes through one side of the magnetic ring 4, and the signal wire 8 passes through the magnetic ring 4 first. The upper part is wound to the bottom of the magnetic ring 4 and then back to the top of the magnetic ring 4 to be directly connected to the load 5 , so that the winding of the signal line 8 is reversed, and the coil 10 is connected to the spectrum analyzer 3 .
因共模电流大小相等方向相反，对于图5的连接方式，两线形成的磁力线方向相反，在磁环4内抵消，只剩下差模电流成分。将频谱分析仪3所得到电压频谱分布图，与所用磁环4的转移阻抗频谱分布图中两者对应频段的数值相减，I(dBuA)＝V(dBuV)-Z(dBΩ)，I表示代表每个频点所对应的的电流幅值的大小，V代表频谱分析仪采集的每个频点所对应的的电压幅值的大小，Z代表转移阻抗频谱上每个频点所对应的的转移阻抗的大小；得磁环4所包含穿过的两线总的差模电流频谱能量分布图。两线差模电流大小相等，信号线8的差模电流频谱能量为总的差模电流频谱能量的一半，在取值一半后，使得磁环4上线圈10两端通过频谱分析仪得到第二电压频谱分布图。Because the common-mode currents are equal in magnitude and opposite in direction, for the connection method shown in Figure 5, the magnetic lines of force formed by the two lines are in opposite directions, which cancel out in the magnetic ring 4, leaving only the differential-mode current component. Subtract the voltage spectrum distribution diagram obtained by the spectrum analyzer 3 and the values of the corresponding frequency bands in the transfer impedance spectrum distribution diagram of the magnetic ring 4 used, I(dBuA)=V(dBuV)-Z(dBΩ), I means 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 collected by the spectrum analyzer, and Z represents the corresponding frequency point on the transfer impedance spectrum. The size of the transfer impedance; get the total differential mode current spectrum energy distribution diagram of the two lines that the magnetic ring 4 passes through. The differential mode currents of the two lines are equal in magnitude, and the differential mode current spectral energy of the signal line 8 is half of the total differential mode current spectral energy. Voltage spectrum distribution.
步骤五：将步骤二得到的共模电流频谱能量分布图和步骤四得到的差模电流频谱能量分布图，与传到发射电流法所测得的导线上电流幅度谱进行对比，获得ECU电控单元1和负载5之间的当前信号线8是否是主要发射源的结果；Step 5: Compare the common mode current spectral energy distribution obtained in step 2 and the differential mode current spectral energy distribution obtained in step 4 with the current amplitude spectrum on the wire measured by the transmission current method to obtain the ECU electronic control. Whether the current signal line 8 between unit 1 and load 5 is the result of the main emission source;
若是主要的发射源，则看到电流法频谱与发明设备所采集到的频谱，在所关注的频段范围内其电流幅值差小于10dBuA；If it is the main emission source, the current amplitude difference between the current method spectrum and the spectrum collected by the invented device is less than 10dBuA in the frequency range of interest;
若不是主要的发射源，则看到电流法频谱与发明设备所采集到的频谱，在所关注的频段范围内其电流幅值差大于15dBuA；If it is not the main emission source, the current amplitude difference between the current method spectrum and the spectrum collected by the invented device is greater than 15dBuA in the frequency range of interest;
定位后针对该信号线增加必要的滤波措施。After positioning, add necessary filtering measures for the signal line.
最后可重复上述步骤二与步骤三，验证整改措施是否减小了传导电流噪声。Finally, the above steps 2 and 3 can be repeated to verify whether the rectification measures have reduced the conduction current noise.
步骤六：将ECU电控单元1经不同的另一根信号线8和负载5进行连接，在每根信号线8连接状态下重复上述步骤，获得ECU电控单元1的各根信号线8的是否是主要发射源的结果并进行整改处理。Step 6: Connect the ECU electronic control unit 1 to the load 5 through another different signal line 8, repeat the above steps in the connection state of each signal line 8, and obtain the signal lines 8 of the ECU electronic control unit 1. Whether it is the result of the main emission source and rectification processing.

Claims (6)

  1. 一种测量ECU信号线传导发射电流的装置，其特征在于：A device for measuring the conducted emission current of an ECU signal line, characterized in that:
    包括磁环(4)、线圈(10)和频谱分析仪(3)三部分，磁环(4)上绕制线圈(10)，线圈(10)的两端连接到频谱分析仪(3)，电源盒(2)经供电线(9)和ECU电控单元(1)的供电端口连接，ECU电控单元(1)的信号输出端口经一根信号线(8)和负载(5)连接；所述的供电线(9)穿设过磁环(4)，所述的信号线(8)穿设过磁环(4)或者绕经磁环(4)。It includes three parts: a magnetic ring (4), a coil (10) and a spectrum analyzer (3). A coil (10) is wound on the magnetic ring (4), and both ends of the coil (10) are connected to the spectrum analyzer (3). The power supply box (2) is connected to the power supply port of the ECU electronic control unit (1) via the power supply line (9), and the signal output port of the ECU electronic control unit (1) is connected to the load (5) via a signal line (8); The power supply line (9) is passed through the magnetic ring (4), and the signal line (8) is passed through the magnetic ring (4) or is wound around the magnetic ring (4).
  2. 根据权利要求1所述的一种测量ECU信号线传导发射电流的装置，其特征在于：还包括信号发生器(7)和水泥电阻(6)，信号发生器(7)经信号回路和水泥电阻(6)连接，信号回路的其中一条穿设过磁环(4)，另一条不穿设过磁环(4)也不绕经磁环(4)。A device for measuring ECU signal line conduction emission current according to claim 1, characterized in that: it also comprises a signal generator (7) and a cement resistance (6), and the signal generator (7) passes through the signal loop and the cement resistance. (6) Connection, one of the signal loops passes through the magnetic ring (4), and the other does not pass through the magnetic ring (4) and does not go around the magnetic ring (4).
  3. 根据权利要求1所述的一种测量ECU信号线传导发射电流的装置，其特征在于：所述的ECU电控单元(1)具有多个信号端口，每个信号端口均连接一根信号端口。A device for measuring ECU signal line conduction emission current according to claim 1, characterized in that: the ECU electronic control unit (1) has a plurality of signal ports, and each signal port is connected to a signal port.
  4. 根据权利要求1所述的一种测量ECU信号线传导发射电流的装置，其特征在于：测试装置中，对磁环(4)预先测试获得转移阻抗：将信号发生器(7)通过两根电缆连接水泥电阻(6)的两端，两根电缆的其中一条电缆穿过磁环(4)；磁环(4)上线圈(10)两端通过频谱分析仪得到的电压频谱分布图，再转换换算得到磁环(4)的转移阻抗频谱分布图。A device for measuring the conduction emission current of an ECU signal line according to claim 1, characterized in that: in the testing device, the magnetic ring (4) is pre-tested to obtain the transfer impedance: the signal generator (7) is passed through two cables Connect the two ends of the cement resistance (6), and one of the two cables passes through the magnetic ring (4); the voltage spectrum distribution diagram obtained by the spectrum analyzer at both ends of the coil (10) on the magnetic ring (4) is converted into The transfer impedance spectrum distribution diagram of the magnetic ring (4) is obtained by conversion.
  5. 根据权利要求1-3任一所述装置的一种测量ECU信号线传导发射电流的方法，其特征在于包括以下步骤：A method for measuring the conducted emission current of an ECU signal line according to any one of claims 1-3, characterized by comprising the following steps:
    步骤一：电源盒(2)经供电线(9)和ECU电控单元(1)连接，ECU电控单元(1)经一根信号线(8)和负载(5)连接，所述的供电线(9)和信号线(8)穿设过磁环(4)，这样状态下磁环(4)上线圈(10)两端通过频谱分析仪得到第一电压频谱分布图；Step 1: The power supply box (2) is connected to the ECU electronic control unit (1) via a power supply line (9), and the ECU electronic control unit (1) is connected to the load (5) via a signal line (8). The line (9) and the signal line (8) pass through the magnetic ring (4), so that the first voltage spectrum distribution diagram is obtained through the spectrum analyzer at both ends of the coil (10) on the magnetic ring (4) in this state;
    步骤二：将步骤一所得到的第一电压频谱分布图与磁环(4)的转移阻抗频谱分布图中每个相同频点的数值相互相除再除以2，进而获得共模电流频谱能量分布图；Step 2: Divide the first voltage spectrum distribution obtained in step 1 and the value of each same frequency point in the transfer impedance spectrum distribution of the magnetic ring (4) and then divide by 2 to obtain the common-mode current spectrum energy. Distribution;
    步骤三：保持步骤一中的电源盒(2)经供电线(9)和ECU电控单元(1)连接以及ECU电控单元(1)经一根信号线(8)和负载(5)连接的条件不变，供电线(9)穿设过磁环(4)，信号线(8)绕经磁环(4)的一侧，这样状态下磁环(4)上线圈(10)两端通过频谱分析仪得到第二电压频谱分布图；Step 3: Keep the power supply box (2) in step 1 connected to the ECU electronic control unit (1) via the power supply line (9) and the ECU electronic control unit (1) to be connected to the load (5) via a signal line (8) The condition remains unchanged, the power supply line (9) is passed through the magnetic ring (4), and the signal line (8) is wound around one side of the magnetic ring (4), in this state, both ends of the coil (10) on the magnetic ring (4) Obtaining the second voltage spectrum distribution diagram through a spectrum analyzer;
    步骤四：将步骤三所得到的第二电压频谱分布图与磁环(4)的转移阻抗频谱分布图中每个相同频点的数值相互相除再除以2，进而获得差模电流频谱能量分布图；Step 4: Divide the second voltage spectrum distribution obtained in step 3 and the value of each same frequency point in the transfer impedance spectrum distribution of the magnetic ring (4) and then divide by 2 to obtain the differential mode current spectrum energy Distribution;
    步骤五：将步骤二得到的共模电流频谱能量分布图和步骤四得到的差模电流频谱能量分布图，与传到发射电流法所测得的导线上电流幅度谱进行对比，获得ECU电控单元(1)和负载(5)之间的当前信号线(8)是否是主要发射源的结果；Step 5: Compare the common mode current spectral energy distribution obtained in step 2 and the differential mode current spectral energy distribution obtained in step 4 with the current amplitude spectrum on the wire measured by the transmission current method to obtain the ECU electronic control. Whether the current signal line (8) between the unit (1) and the load (5) is the result of the main source of emission;
    若是主要的发射源，则查看电流法频谱与发明设备所采集到的频谱，在所频段范围内判断电流幅值差是否小于10dBuA；If it is the main emission source, check the current method spectrum and the spectrum collected by the invented device, and judge whether the current amplitude difference is less than 10dBuA within the frequency range;
    若不是主要的发射源，则查看电流法频谱与发明设备所采集到的频谱，在所频段范围内判断电流幅值差是否大于15dBuA；If it is not the main emission source, check the current method spectrum and the spectrum collected by the invented device, and judge whether the current amplitude difference is greater than 15dBuA within the frequency range;
    步骤六：将ECU电控单元(1)经不同的另一根信号线(8)和负载(5)进行连接，在每根信号线(8)连接状态下重复上述步骤，获得ECU电控单元(1)的各根信号线(8)的是否是主要发射源的结果。Step 6: Connect the ECU electronic control unit (1) to the load (5) through another different signal line (8), repeat the above steps in the connected state of each signal line (8), and obtain the ECU electronic control unit Whether each signal line (8) of (1) is the result of the main emission source.
  6. 根据权利要求5所述的一种测量ECU信号线传导发射电流的方法，其特征在于：所述的磁环(4)的转移阻抗频谱分布图采用以下方式获得：将信号发生器(7)通过两根电缆连接水泥电阻(6)的两端，两根电缆的其中一条电缆穿过磁环(4)；磁环(4)上线圈(10)两端通过频谱分析仪得到的电压频谱分布图，再转换换算得到磁环(4)的转移阻抗频谱分布图。A method for measuring the conducted emission current of an ECU signal line according to claim 5, characterized in that: the transfer impedance spectrum distribution diagram of the magnetic ring (4) is obtained in the following manner: passing the signal generator (7) through Two cables are connected to both ends of the cement resistor (6), and one of the two cables passes through the magnetic ring (4); the voltage spectrum distribution diagram obtained by the spectrum analyzer at both ends of the coil (10) on the magnetic ring (4) , and then converted to obtain the transfer impedance spectrum distribution diagram of the magnetic ring (4).
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