Lightning electromagnetic pulse shielding effectiveness measuring device and method

Abstract

The invention relates to a lightning electromagnetic pulse shielding effectiveness measurement device and method, including a DC high-voltage generator, a charging switch, a current-limiting resistor, a non-inductive pulse capacitor, a tungsten-embedded switch, an AC-DC voltage divider, an adjustable inductance, a large transmission line, Adjustable water resistance, pulse electric field optical fiber measurement system, pulse magnetic field optical fiber measurement system, shielding cabinet and oscilloscope, characterized in that: after the DC high voltage generator charges the non-inductive pulse capacitor to a given voltage through the charging switch and the current limiting resistor, the The tungsten switch discharges the energy stored in the capacitor through the adjustable inductance to the large transmission line and the adjustable water resistance to generate lightning electromagnetic pulses. The shielding body to be tested is placed in the transmission line, and the pulse electromagnetic field inside and outside the shielding body is measured at the same time to calculate its shielding effectiveness. The shielding effectiveness of the shielding body against various lightning electromagnetic pulse electric fields and magnetic fields can be measured more realistically and simultaneously.

Description

technical field [0001] The invention belongs to the field of lightning electromagnetic pulse shielding measurement, in particular to a measuring device and a measuring method for measuring the lightning electromagnetic pulse electric field and magnetic field shielding effectiveness of a shielding body. Background technique [0002] With the development of microelectronics technology, electromagnetic compatibility issues have become important in all walks of life. Lightning electromagnetic pulse is an electromagnetic pulse that is ubiquitous in nature and can interfere or even destroy electronic equipment. Therefore, in order to suppress the influence of the lightning electromagnetic pulse on the electronic equipment, shielding measures are usually adopted, and a shielding device is installed to shield the electronic equipment and protect the electronic equipment. Commonly used shielding devices include shielding rooms, shielding cabinets and shielding boxes. However, the s...

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Problems solved by technology

[0003] In the past, the shielding effectiveness of pulsed electric field and pulsed magnetic field was measured locally using a small portable test system, which is different from the actual environment. The measured shielding effectiveness can only be approximated as a reference, and does not really represent the shielding effectiveness of the shield under test. Moreover, the two shielding effects of pulsed electric field and pulsed magnetic field have to be measured separately, which is not efficient.

The waveform generated by the previous electromagnetic pulse simulator is basically fixed, and it is inconvenient to adjust the rise time and width parameters of the waveform

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