Abstract This thesis presents the design and hardware development of a Custom Controller Board for the Semikron SKAI 3 LV, a three-phase MOSFET inverter system, as part of the Inverter research initiative. The main goal is to develop a flexible, open-architecture hardware interface that connects commercial automotive power electronics with custom control algorithms, enabling advanced Model-Based Design (MBD) research for low-voltage electric vehicle (EV) applications. The design uses the NXP S32K342 microcontroller, an automotive-grade MCU. The reason behind this selection is its ASIL-compliant safety features and compatibility with the NXP Model-Based Design Toolbox for MATLAB/Simulink. The focus of the power stage design is to create a reliable, multi-stage power supply system capable of transforming a variable high-voltage DC-link input (nominally 96 V, with transients up to 120 V) into stable low-voltage logic rails (13 V and 5 V) to supply different parts of the system.