Ms. Rauls et al., DESIGN CONSIDERATIONS FOR HIGH-FREQUENCY COAXIAL WINDING POWER TRANSFORMERS, IEEE transactions on industry applications, 29(2), 1993, pp. 375-381
The use of coaxial windings to create low loss, low leakage reactance,
power transformers for use in high frequency soft switched dc/dc and
resonant converters has been demonstrated in [1]. This paper examines
some of the important loss aspects of the design of coaxial winding tr
ansformers such as the influence of skin effect on winding resistance,
the variation of core loss caused by nonuniform core flux density, an
d the choice of the principle dimensions and aspect ratios for maximum
efficiency. Experimental measurements on a 50 kVA 50 kHz unit, are in
cluded to confirm portions of the analytical results and suggested des
ign procedures.