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This article introduces a holistic and systematic design methodology tailored to the 10 kV silicon carbide (SiC) mosfet power modules. Multiobjective optimization was achieved with enhanced electric-field (E-field) distribution, minimized common-mode (CM) parasitic capacitance, and reduced system-level parasitic inductances. The proposed approach encompasses two innovative techniques: 1) an electric-potential-oriented module-system interface to reduce system-level parasitic inductance while maximizing insulation capability; 2) stacked substrates with patterned middle layer copper to alleviate the E-field concentration at the triple-point and reduce the maximum E-field without compromising on thermal resistance. The effectiveness of these innovative approaches is substantiated through the development of a 10 kV SiC mosfet power module. The optimized layout presents well-balanced 5.6 nH power loop inductance with embedded decoupling capacitors and record-low 28 pF CM parasitic capacitance, attributed to the middle layer pattern structure. In addition, a 38.6% E-field concentration reduction at the triple-point is identified compared to conventional stacked substrates. Experimental validation showcases its robust voltage insulation capability with a leakage current of 0.87 μA at 10 kV, a 33 kV dc, and 25 kV ac surface flashover for worst-case system fault conditions. The partial discharge inception voltage of the proposed middle layer patterned stacked substrates is verified at 16.8 kVrms. Dynamic performance validation through a double-pulse test at 5 kV showcases negligible ringing and voltage overshoot. All these exceptional attributes position the packaged 10 kV SiC mosfet power module as an exemplary choice for MV power electronics applications.

In the field of electric mobility, in particular heavy-duty electric vehicles and long-haul trucks, the energy systems are susceptible to transients with different amplitudes and dynamics due to the high power demand. With the combination of high power and long distances, the available battery technologies become insufficient as a single energy source for such a system. Thus, the integration of hybrid energy storage systems (HESSs) with different energy capabilities, such as fuel cells, battery packs, and supercapacitors, is highly required. In this context, for leveraging HESSs in an efficient way, a resonant multiwinding transformer-based converter is proposed to interconnect these different energy storage systems (ESSs) since the resonant converters are able to operate at a wider range of switching frequencies and, hence, a wider soft-switching range. However, due to the multiple resonant circuits and possible parameter deviations, the control capability might be compromised. Thus, a multiport resonant dc/dc converter embedded with variable inductors is proposed to enhance the power flow management among these different ESSs with reduced conversion stages. Further, the proposed concept can also improve the immunity to parameter deviations on the resonant by compensating for possible variations at the resonant frequencies. Finally, simulations and experimental results of a $\text{20} \;\text{kW}$ four-port resonant dc/dc converter embedded with variable inductors are shown to prove the effectiveness of the proposed concept.