Abstract: The present invention relates to high density electronic power supplies and more particularly switching power supplies employing a metallic enclosure and integral cooling means. The configuration employs an array of thermally conductive metal bars to optimally distribute heat from a number of dissipative elements to a thermally conductive metal element that has substantial surface area within an internally generated air stream. The thermally conductive metal element may be the metal enclosure that also acts as a heat sink or fins, both of which provide substantial surface area to the air stream.

Abstract: A current sharing circuit forces current delivered to a common load to be provided in substantially equal shares by two or more D.C.-to-D.C. converters, particularly those of the type whose output varies according to a predetermined functional relationship with the frequency of a controllable signal generated by the converter indicating its operating frequency. The load current delivered by such converters typically varies approximately proportionately with the converter operating frequency when the converter input and output voltages are held constant. Based on the frequency of these indicating signals and the predetermined relationship between their frequency and the output current of each respective converter, it is determined which particular one of the converters is presently supplying the largest share of load current. The outputs of each of the other converters are adjusted to share the load more equally among all the converters.