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Irradiation of silicon power devices is discussed for electrons of 0.8 to 12 MeV energy and gammas from Co60 in terms of their effectiveness in altering device switching properties. Comparison is made with gold or platinum diffused devices. Gold diffusion provides the best tradeoff of forward voltage drop and reverse recovery time in diodes or turnoff time in thyristors. This advantage is somewhat...
(Full Paper not available at time of publication) The first part of the paper describes principal features and special testing of a power transformer designed and developed for space use. The magnetic requirements include a wide variety of operating conditions such as 2.25kW continuous power and primary current to 35A RMS at frequencies up to 20kHz. The main secondary Is at 1100V but there is an additional...
(Full Paper not available at time of publication) This paper discusses the development of cylindrical wound metallzed-fllm capacitors of nominal 2 μF, 500 V rating that have energy densities greater than 0.1 J/g. This density Is about a factor of 20 better than capacitors of similar ratings commonly used In spacecraft power conditioners.
It is proposed that the limit of thermal instability replace the traditional limit of second breakdown for the safe-operating-area limits of power transistors. A nondestructive method for measuring the limit of thermal instability is described. The relationships between thermal instability, stable hot spots, and second breakdown are reviewed and it is shown that stable hotspot operating conditions...
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