Diode Control Research.
Abstract
A test plan and test stations have been devised for testing of four five-cell nickel-cadmium batteries with stabistor charge control in vacuum and over a temperature range of 0 to 50C. One feature of the test setup is a battery retaining test fixture which provides heat sinking, cell over-pressure indication, and cell restraint. Also, a simple timing circuit for incremental approximation of the varying discharge times of the synchronous orbit is described. This circuit, using all standard components, provides a 48 cycle eclipse with discharge times of 6 to 74 minutes. An analysis of heat transfer associated with a typical stabistor heat sink has been carried out to demonstrate that once 10 microns of vacuum is reached, further decreases in pressure have little effect on the heat transfer conditions. This results from the fact that the stabistor heat sink cooling is mainly by conduction to the satellite frame, and other modes of cooling (radiation and conduction to the gas present at low pressures) are insignificant by comparison. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1968
- Accession Number
- AD0845341
Entities
People
- Elliot S. Simons
- James V. Ball