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Proceedings Paper

Solid state high-voltage crowbar device applicable to helmet-mounted display rapid disconnection
Author(s): Jim Cooper; Mark Adams; John Ardussi
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Paper Abstract

The use of cathode ray tubes in airborne helmet mounted displays (HMD) imposes a design requirement to safely discharge high voltage potentials (up to 13 kV), upon disconnection of the helmet from the cockpit electronics. For ejection safety, the discharge of energy stored in the HMD must be both rapid and complete, requirements difficult to reliably meet using traditional vacuum spark gaps. Experiments demonstrating the problem are presented in this paper, together with an alternate circuit approach which solves the problem by using all solid state components. The device is packaged as a miniature encapsulated module to meet airborne requirements, and has completed more than 1,500 -55 degree(s)C/+85 degree(s)C thermal cycles of failure-free stress testing. A Standard Electronic Module format high voltage power supply incorporating this device was designed for the Comanche RAH-66 HMD system.

Paper Details

Date Published: 22 May 1995
PDF: 7 pages
Proc. SPIE 2465, Helmet- and Head-Mounted Displays and Symbology Design Requirements II, (22 May 1995); doi: 10.1117/12.209736
Show Author Affiliations
Jim Cooper, ELDEC Corp. (United States)
Mark Adams, ELDEC Corp. (United States)
John Ardussi, ELDEC Corp. (United States)

Published in SPIE Proceedings Vol. 2465:
Helmet- and Head-Mounted Displays and Symbology Design Requirements II
Ronald J. Lewandowski; Wendell Stephens; Loran A. Haworth, Editor(s)

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