Allowable power analysis for high power density DC-DC converters using integrated magnetic components

Total volume evaluation of high‐power density non‐isolated DC–DC converters with integrated magnetics for electric vehicles

“…Core losses are mainly dependent on the eddy currents and the hysteresis process, and they can be calculated by the well-known Steinmetz equation (SE) [20][21][22][23]. However, this calculation method is limited because it is valid only under a sinusoidal excitation condition.…”

“…In the example case, k = 4.5 × 10 −14 , α = 1.55, and β = 2.5. k i can be calculated by applying these parameters to (2), and the core losses per volume are obtained from (1). The complete derivation of the core losses is shown in [20,24].…”

“…where h is the convective heat transfer coefficient. The required heat sink dimensions, and thereby its volume, can be calculated by solving (17) using (18)- (20). This calculation is made using the heat sink parameters shown in Table 4.…”

“…In addition, to have a better understanding of the calculated volume, Table 5 also reports the Cooling System Performance Index (CSPI), defined as the power density capability of the cooling system, described in detail in [30]. From this comparison and the derivation of (17)- (20), it was possible to notice that heat sinks with larger effective area may further reduce the volume in comparison to those who have longer height.…”

“…These topologies were selected because the interleaving‐phases technique can downsize the output capacitor, i.e. a higher frequency is achieved by power transmission alternation in each phase [20]. In addition, the magnetic coupling technique is effective because the inductor current ripple presents a higher frequency behaviour, and DC fluxes can be cancelled due to the mutual induction effect [15].…”