ABSTRACT
Col. W. T. McLyman (Jet Propulsion Laboratory, National Aeronautics and Space Administration; now retired) has worked out the approximate weight and volume relationships using the area product, Ap. These depend on the type of core and the winding technique. The purpose here is to show that the entire weight and volume are reduced if an inductor of critical value is included in the linear power supply. This inductor is placed between the diodes and storage capacitor. This mainly applies to filters that have serious loss requirements at very low frequencies such as specified in Military Standard (MIL STD) 461. Years ago, these were called inductive input power supplies. This also applies to power factor correction circuits that remove the high current spikes required to charge the storage capacitors twice per cycle. Regardless of which technique is used, the size and weight of the EMI filter are reduced, especially for 461 and similar specifications.
