Attenuator for protecting an electroexplosive device from inadve

Details Attenuator for protecting an electroexplosive device from inadve Attenuator for protecting an electroexplosive device from inadve

1990-09-18

1994-01-18

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Accidental fuse ignition prevention means

F42B 318

Patent

active

052792250

ABSTRACT:
A device for preventing an electroexplosive device from inadvertent RF energy or electrostatic energy induced firing, even if that device is exposed to high RF power levels or high RF frequencies or to high electrostatic potentials, includes an impedance element in the firing input line between a source of dc power and a bridgewire which has an impedance that exceeds an impedance between the input leads and ground. When RF energy levels and frequencies exceed certain values, arcing occurs between one input lead and the other or between the input leads and a conductive case to cause energy to flow to the conductive case instead of to the bridgewire. One form of the device includes a Ferrite element in electrical and thermal contact with both of the firing input leads and with the thermally and electrically conductive case. The Ferrite element has a dc resistance in excess of the dc resistance of the bridgewire so short circuiting the firing current does not occur.

REFERENCES:
patent: 2377804 (1945-06-01), Narvarte
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patent: 4517895 (1985-05-01), Rucker
patent: 4592280 (1986-06-01), Shores
patent: 4848233 (1989-07-01), Dow et al.

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