Thermal analysis of a high energy density pre-biased choke

Chokes are important elements in many power electronics circuits, for example in boost converters and current source inverters. Minimizing the choke´s volume and mass is desirable in many applications. The main limit of an electromagnetic design lies in its thermal performance. Accurate prediction of the temperature within a new device is therefore very desirable. This paper presents a thermal analysis of a high energy density pre-biased choke. The thermal analysis is carried out using a finite element method (FEM) and a thermal lumped parameter network. The high energy density equal to 0.49 J/kg is demonstrated as a result of improved thermal management and permanent magnet biasing. The theoretical findings for the high energy density choke are compared against a conventionally built choke and test results are obtained from a prototype choke.