Accession Number : ADD004595

Title :   EMP Circuit Board Filter Using MOV Devices.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Campi,Morris

Report Date : 03 May 1977

Pagination or Media Count : 3

Abstract : Two partial circular chips of metal oxide varistor (MOV) material are mounted in a TO-5 transistor case. Each chip acts as a capacitive element to ground for a low pass pi-filter network. An inductance, whose value is chosen for the required filter impedance and cut off frequency, is placed across the MOV chips and connected to TO-5 contacts, along with the MOV, completing the filter network. At normal signal levels, the package acts as a normal low-pass pi-filter network. At higher signal levels and transients,, the bipolar MOV components clamp the voltage to a given level, determined by the MOV material grain structure and chip thickness. (Author)

Descriptors :   *Patents, *Low pass filters, *Protective equipment, *Communication equipment, *Circuits, Electromagnetic pulses, Overload, Metal oxide semiconductors, Varistors

Subject Categories : Electrical and Electronic Equipment
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE