A 3-MATERIAL PASSIVE DL DT LIMITER

This article introduces and examines a composite magnetic device (call ed a dI/dt limiter) which functions as a bilevel inductor. For de curr ents below a designed threshold level, the inductance and resistance o f the device is quite low. However, the inductance of the device incre ases dramatically for all currents greater than the threshold level. I n this article a set of performance equations are derived which descri be the inductance of the dI/dt limiter as a function of current. The d ata obtained from these performance equations are compared to the resu lts of a set of finite element simulations.