Some design aspects concerning input filters for DC-DC converters

Various DC-DC converter input filter requirements as applied in spacecraft power processing equipment, are reviewed with respect to the spacecraft, its power source and filter loads. The conflicting implications arising from the requirements are noted. A filter configuration capable of providing a satisfactory overall compromise is presented. Various design aspects for converter input filters are analyzed. These include minimum weight toroid inductor design, the possibility of non-linear oscillation developing through the interaction of an input filter and a negative impedance regulator and problems in using paralleled capacitors to supply switching regulator loads.