High frequency high current filter inductors with minimum thermal resistance

Abstract

Improving power density is a permanent challenge of R&D in power electronics. A survey of modern power electronic circuits shows that further optimization has to be based on the passives and particularly on the inductive components. State-ofthe-art inductors (e.g. in LC, LCL and dU/dt filters) contribute a lot to space, weight, losses and cost as well. In this paper, a new generation of power inductors is presented. The thermal management of these components has been optimized using FEM and extensive thermal measurements. Thus, much higher electrical current densities have become possible at the same hotspot temperature, which is finally equivalent to higher energy density and smaller component size.

Design, analysis and simulation of magnetic biased inductors with saturation-gap

“…The two cylinders with coils are connected using ferrite segments with square section. This topology is normally used in high frequency and high power applications, since it presents a better thermal performance compared to standard gapped cores [17] [18]. A possible strategy could be to introduce the PMs inside the distributed air-gap material.…”

Analysis of a thrust magnetic bearing with rectangular wire winding

“…With the development of manufacturing technique of the rectangular wires, there are more and more sizes of the rectangular wires commercially available, and the cost is gradually decreasing. Therefore, the rectangular wires have been increasingly used in electric machines, 14–16 transformers, 17 inductors, 18 and so on.

Figure 1.Diagram of configurations and wire filling factor of round wires and rectangular wires in slot, of which the wires have the same cross-sectional area and number.

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“…With the development of manufacturing technique of the rectangular wires, there are more and more sizes of the rectangular wires commercially available, and the cost is gradually decreasing. Therefore, the rectangular wires have been increasingly used in electric machines, [14][15][16] transformers, 17 inductors, 18 and so on.…”