Anticipating system-level electromagnetic interference using numerical methods and measurement techniques

There has been a significant increase in the amount of electronic equipment introduced into the electric vehicle (EV) or hybrid electric vehicle (HEV). The concurrent module-level and vehicle-level EMC design flow at early development stages is becoming important and inevitable for solving the accompanying increase of electromagnetic interference (EMI) problems. In this work, strategies combining both numerical modeling and experimental techniques are developed for anticipating system-level EMI at the early stage, and verified in a controlled laboratory environment.; A dual current probe method is proposed for quantifying conducted EMI characteristics of electronic modules. In this topic, ambiguous concepts are clarified, and the limitations of this experimental technique are also understood.; A transfer function strategy combining module-level measurements with system-level numerical modeling is developed for anticipating system-level EMI at the early design stage, and verified with the schematic experiments in the laboratory.; Several numerical models for automotive harnesses on a vehicle platform are developed. First, the feasibility of extracting a single-wire equivalent model from a harness consisting of closely spaced wires is investigated, and the basic underlying physics is understood. Two different single-wire equivalent models are implemented in the finite-difference time-domain (FDTD) method.; Finally, a dual-step multi-conductor transmission-line (MTL)/FDTD strategy is developed for system-level numerical modeling. The effectiveness and limitation of this approach are demonstrated in this work.