An experimental research on EMI filters capability in controlling EMP

In an EMP filter there must be some suppressing components, such as TVS (transient voltage suppressor) or MOV (metal oxide varistor). They play a very important role in controlling transients into a certain level. On the other hand, both of TVS and MOV have their defects, such as the frangible overload capability, huge transient energy may cause EMP filters' failure. We have investigated some EMI filters. Initial results show that an improving EMI filter without suppressing components exhibits excellent capability in controlling EMP. Feed-through filters with larger capacitance can control very high EMP amplitude effectively.