Design relationships for Iron-core filter chokes

WHEN FILTER CHOKES are designed for use in d-c power supplies, it frequently becomes necessary to make an estimate of the physical size of the choke, once the electrical ratings have been determined. The electrical ratings usually considered are the inductance, the d-c resistance, and the maximum allowable d-c current. Several fundamental relationships between these ratings and choke size are made. The relationships that result from the following analysis not only can be used for estimating the space requirements of a choke from a knowledge of the electrical ratings, but also point out interesting interrelationships of the electrical ratings.