Magnetic Design Aspects of Coupled-Inductor Topologies for Transient Suppression

Based on the discovery of surge absorption capability supercapacitors, a transient protector named supercapacitor-assisted absorber (SCASA) was designed and implemented in commercial device. Despite its simplicity, circuit topology consisted coupled inductor wound around specially selected magnetic core. This paper elucidates design aspects SCASA coupled-inductor topologies with special focus action core windings during propagation. The non-ideal operation transformer studied based semi-empirical approach predictions made by using magnetizing leakage permeances. toroidal flux distribution through also determined for 6 kV/3 kA combinational surge, these findings were validated lightning simulator. In predicting possible effects saturation, hysteresis properties different powdered-iron ferrite types considered to select optimal absorption. test results presented this research revealed that X-Flux toroid air-gapped EER yielded exceptional performance ∼10% ∼20% lower load–voltage clamping compared existing Kool μu design. These prototypes further demonstrated remarkable endurance, withstanding over 250 consecutive transients. covers details three-winding optimizations LTSpice simulations under IEC 61000/IEEE C62.45 standard conditions.