EMP circuit board filter using MOV devices

Details EMP circuit board filter using MOV devices EMP circuit board filter using MOV devices

1976-01-19

1977-05-03

Gensler, Paul L.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 17L, 333 79, 361119, H03H 1300, H03H 710, H03H 714, H02H 327

Patent

active

040217604

ABSTRACT:
Two partial circular chips of metal oxide varistor (MOV) material are moud 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.

REFERENCES:
patent: 3824431 (1974-07-01), Schlicke
patent: 3842374 (1974-10-01), Schlicke
patent: 3845358 (1974-10-01), Anderson et al.
patent: 3863111 (1975-01-01), Martzloff

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