EMC-Aware Design of a Planar Inductor for Low-Profile OLED Drivers

This paper presents the design of a planar inductor used in a low-profile organic light-emitting diode driver for large-area lighting. The design takes into account both the buck converter requirements and the electromagnetic compatibility issues. Multiple inductor design cases are investigated using EM simulations and verified by measurements. The properties of the planar inductors are represented by its magnetic moment and the modified quality factor, which also includes the power losses inherent to the buck converter. The multiobjective optimization shows that the designs that simultaneously maximize the quality factor and minimize the magnetic moment of the planar inductor are located along the resonant frequency limit. The result of the optimization process is the inductor design that introduces minimum power losses in the buck converter for a given level of radiated emissions.