Design Considerations in Multi-Output DC-DC Converter with Magnetic Amplifiers

Multiple output dc-dc converters, that take advantage of cross-regulation, are useful power supplies for electronic equipment which require several regulated voltages with good isolation. However, since regulation errors are contained in the cross-regulated outputs, they should be stabilized to obtain a precisely regulated output. Magnetic amplifiers are suitable for this purpose, but no quantitative design method has yet been fully established. This paper proposes utilization of magnetic amplifiers to compensate for cross-regulation errors in the multi-output dc-dc converter, and describes SR optimum design conditions presenting a suitable cross-sectional area and number of turns for the SR. Further, it is also clarified that SR core can be reduced in size by utilizing an amorphous core and increasing the operating frequency.