Power converter for lunar roving navigation subsystem

The Power Converter design for the Lunar Roving Vehicle Navigation Subsystem is described. The Lunar Roving program is summarized in sufficient detail to define the mission and operating environment. Certain Navigation Subsystem design trades pertinent to Power Converter requirements are discussed. A block diagram of the Power Converter is shown and described. Detail circuits are shown, with discussion of design trades, unique features, and performance. The Power Converter consists of a 28VDC switching preregulator, a DC-to-DC converter, three DC voltage regulators providing ±16VDC and +5VDC, and a 115VAC 4.00 Hertz inverter. Design trades considered circuit configurations, parts selection including choices between integrated circuits and discrete components, and functional choices such as exclusion of current limiting or equivalent short circuit protection. Finally, packaging design of the Navigation Subsystem and its Power Converter are briefly reviewed with comments on advantages and disadvantages of the selected design.