INVESTIGATION OF LIGHTWEIGHT PORTABLE BATTERY CHARGER TECHNIQUES.
Quarterly progress rept. no. 1, 15 June-30 Sep 63,
AEROSPACE RESEARCH INC BOSTON MASS
Pagination or Media Count:
Various power conversion and control schemes are considered from the viewpoint of general applicability to the area of lightweight portable battery chargers. Several battery charging methods are described. An analysis is made indicating that maximum charging efficiency and minimum charging time are mutually exclusive conditions a decrease in charging time must be achieved at the expense of decreased efficiency. Several possible charging current waveforms are compared from the standpoint of obtaining maximum control device utilization and optimum circuit efficiency. This waveform comparison is made in terms of ratios of peak to average values and mean-squared to squared average values. A detailed analysis of the a-c conduction angle controlled charger is made and the results of the analysis presented in terms of the various significant circuit parameters. A novel transformerless DCDC voltage doubler circuit is described. A resonant charging circuit has been developed in which several hundred watts of power are transferred to the battery through a load winding magneticallycoupled to an inductor in a series-resonant circuit. Author