Leakage Inductance of an Improved Core Power Electronic Transformer with Magnetic Shunt Integration

抄録

In this study, a leakage inductance calculation method was developed for a magnetic shunt integrated improved core geometry of a power electronic transformer. A magnetic shunt is integrated to increase their leakage inductances to eliminate the need for external inductors in applications such as LLC resonant converters. Four state-of-the-art core geometries (EE, EI, ER and ETD) were studied in this study to determine their advantages and disadvantages in designing a precise leakage inductance. Subsequently, a new improved ERTD core geometry with non-overlapping interleaved winding arrangement was designed, on which shunt integration was performed. Analytic equations were developed using magneto motive force variations and leakage energy distributions for precise calculation of leakage inductance. The thickness of the magnetic shunt and permeability of the shunt material were observed to influence the leakage inductance. A range of leakage inductances was calculated by varying the permeability of the shunt from 100 to 500 and the thickness of the shunt from 0.1 to 0.8 mm. Finite element analysis was performed on a 2 kW, 100 kHz power electronic transformer to verify the leakage inductance calculation method, and the simulated results corresponds with the analytical results.