protective device for an electronic device against strong electromagnetic pulses, especially caused by lightning.

摘要

A device for protecting electronic equipment (42) against strong electromagnetic pulses, the equipment being contained in a radioelectrically insulated enclosure (40) and connected to a line outside the enclosure, the protective device being disposed in another radioelectrically insulated enclosure (2) and comprising an input (4) connected to said line (6) and an output (8) connected to the equipment, the device being characterized in that it comprises in series: at least one first clipping cell (12A) comprising a clipper having one end connected to the input of the clipping cell and another end to ground, and a low-pass filter disposed between the input and the output of the clipping cell, and a filtering cell (14) comprising in series a low-pass filter (12A) and if necessary a device (14B) for switching the cut-off frequency of the filter. The device is particularly applicable to the protection of telephonic and digital lines.