Abstract: An N phase digital inverter for converting an input DC voltage level to an output DC voltage level interposes between the input and output terminals thereof a plurality of N parallel switching circuits, each switching circuit thereof comprising in series a power switch and a transformer. The output of each transformer is coupled through a diode to a common point for filtering to generate the output DC voltage. The output DC voltage is sensed and fed to a logic generator for generating a ring sequence of pulses which activate sequentially each power switch in the plurality thereof. The logic generator controls the ratio of pulse time ON divided by pulse time ON plus pulse time OFF to maintain a desired level of output DC voltage.

Abstract: A power supply system for use in conjunction with digital systems and particularly adapted to avoid impairment of digital system performance by power supply generated noise. The clock frequency of the digital system is monitored, divided and then applied to control the switching frequency of a D.C. to D.C. power converter. The converter thus switches at a synchronized submultiple of the digital clock frequency such that switching transients are confined to transition times within the digital system.