Modern electric and off-road vehicles increasingly adopt 800 VDC battery systems to enable faster charging and reduce current levels. However, this higher system voltage introduces significant challenges related to creepage and clearance distances, electrical isolation, and thermal management. The fundamental question addressed in this work is how to achieve a compact yet safe and thermally robust design under these high voltage constraints. The presentation focuses on the power stage architecture and its integration within the overall electric drive system.

Main challenges:
The design of the power stage addresses several interconnected challenges. Thermal management is strongly constrained by system‑level limits on coolant temperature and pressure drop, shared between the electric motor and power electronics, which directly influence cooling architecture, thermal interfaces, and overall thermal resistance. Electrical isolation at 800 VDC demands strict compliance with creepage, clearance, and dielectric strength standards to ensure safety. Mechanical integration within the motor housing requires optimizing geometry and interfaces to achieve compactness while preserving thermal and isolation performance. Electromagnetic compatibility, though secondary here, remains dependent on layout, switching behavior, and motor impedance, with EMI filter size becoming significant at high voltage and current. Finally, cost efficiency drives the overall design, requiring a balance between performance, manufacturability, and robustness suitable for large‑scale production.