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Introduction to automotive conductive immunity

Release time:

2023-05-31 10:39

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　　With the continuous progress of science and technology, the use of machines in all walks of life is more and more recognized by everyone, and with the help of machines can complete people can not complete or too time-consuming things, so the vehicle conduction immunity as an important detection project, also plays a very important role.

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　　Then, as the automobile electronic conduction immunity, its power line will inject interference signals directly through the DC power line, and investigate the equipment's immunity to transient interference on the DC power supply. Then in the signal line conduction transient immunity, mainly through the capacitive coupling clip (CCC) and inductive current probe (ICC) and capacitance (DCC) coupling to the signal line or control line, so that you can examine the ability of the equipment to resist electrical transient interference. The above two are the introduction of time domain signal transduction immunity of automobiles. Then for the frequency domain signal conduction immunity of the vehicle, there will be high current injection (BCI) method first, which is mainly to place a current injection probe on the cable harness device connected to the device under test, such as the device such as AV system, optical drive, electric rearview mirror and other automotive electronic equipment harness and other components. Conduction immunity then injects RF interference into the probe.

　　The pulse source of conductive immunity mainly comes from the pulse measured in the vehicle electrical system under certain conditions and the pulse generated by the basic configuration of the electrical circuit. As for the DCC method, the characteristics of its pulse generator should be verified. Therefore, the voltage when the output end of the pulse generator is open should be measured first. Moreover, the output of the pulse generator is connected in series with the coupling capacitor, and the conductive immunity will be measured with the high-impedance oscilloscope when the output end of the capacitor is open. The peak voltage of the capacitor when the output terminal is open reaches the level required by the test. Conductive immunity is an important test for measuring the EMC index of the device under test (EUT). This standard is about the equipment from the frequency range of 9KHz~80MHz conducted harassment immunity requirements, and the equipment tested here through at least one connection cable, such as power line, signal line, ground wire and other lines will be coupled with the radio frequency.

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