Improved analytical modeling of conductive losses in gapped high-frequency inductors

An improved method to predict conductive losses in gapped high-frequency inductors is presented and used for parametrization of an equivalent small-signal circuit model. The method is based on the superposition of power losses resulting from the well-known one-dimensional (1-D) field calculation and losses due to eddy currents caused by the fringing field of air gaps determined from novel analytical two-dimensional field calculations. Losses due to reactive currents in the windings caused by self capacitances are also considered. A greatly improved accuracy compared to 1-D analysis is proved by measurements.