Simplified Wide-Band Frequency Models for Single and Multi-Layered Boost Inductors

Three phase boost power factor correction circuits (PFCs) are a commonplace in grid-tied applications. Typically, a compensating line inductor is added in series with the rectifier to perform the necessary boost functionality, reactive power control and filter line harmonics. Therefore, the impedance characteristics of the line inductor i.e., the boost inductor, is critical from (Electromagnetic Interference) EMI compliance point of view in such a generic PFC system. This paper specifically addresses the anti-resonance phenomenon observed with traditional multi-layered winding of a boost inductor. A 3-port model for such multi-layered boost inductors is developed to capture this phenomenon accurately. Based on the initial findings, single-layered edge-wound inductor solution is proposed to eliminate the anti-resonance mode. Consequently, modeling procedure for edge-wound inductor is developed. Simulation and experiment results are performed using a three-phase three-level rectifier test bed to verify the effectiveness of the proposed solution over a traditionally wound boost inductor. In summary, a quantitative comparison of different solutions is shown which shows the edge-wound coil to be the superior candidate.