Device for protecting electronic equipment against strong electromagnetic pulses, especially due to lightning

摘要

Device for protecting electronic equipment 42 against strong electromagnetic pulses, the said equipment being contained in a radio-electrically insulated enclosure 40 and being connected to a line outside the said enclosure, the said protecting device being arranged in another radio-electrically insulated enclosure 2 and comprising an input 4 connected to the said line 6 and an output 8 connected to the said equipment, the said device being characterised in that it includes, in series: - a clipping cell 12 comprising a clipper, having one end connected to the input of the said clipping cell and another end earthed, and a low-pass filter arranged between the input and the output of the said clipping cell, and - a filtering cell 14 comprising in series a low-pass filter 14A and a switching means 14B for the cut-off frequency of the said filter. Application in particular to the protection of digital and telephone lines. IMAGE