Design considerations for high power density/efficient PCB embedded inductor

Design and evaluation of high current PCB embedded inductor for high frequency inverters

“…Designing an inductor with the above specifications, not only limit the ripple amplitude, it also helps to effectively filter our high frequency harmonics [3]. Following equation shows the resonant frequency of parallel LC circuit:…”

“…Also, compared to other common structures for a PCB embedded inductor, toroid has some drawbacks addressed in this paper such as relatively lower quality factor and inductance per area, less flexibility, and high resistance caused by thin petals, and the poor fill factor of the vias used in both inner and outer edges [3], [6].…”

“…With increasing the frequency to the MHz range, magnetic core loss increases drastically [1]. So, air core PCB embedded inductors become a viable solution, as the sizes are shrinking, and the core losses are avoided [2], [3]. It will also lead to a cost reduction, as smaller passive components are less expensive.…”

“…It will also lead to a cost reduction, as smaller passive components are less expensive. In general, the advantages of passive components integration will be size reduction, better thermal conduction, high parameter repeatability, high reliability, and cost reduction [3], [4].…”

“…Among several structures for the design of PCB embedded inductors described in the previous literature [3], [5], toroidal inductors are chosen in this paper due to their internal encapsulation of the magnetic field avoiding EMI problems. Also, compared to other common structures for a PCB embedded inductor, toroid has some drawbacks addressed in this paper such as relatively lower quality factor and inductance per area, less flexibility, and high resistance caused by thin petals, and the poor fill factor of the vias used in both inner and outer edges [3], [6].…”