In the last decade, the environment protection and the usage of renewable energies have become more relevant both socially and politically, and scientifically. The transport sector is one of the main causes of greenhouse gases and pollution, contributing up to 27% of global emissions. In this unfavorable context, the electrification of road vehicles becomes a crucial factor.

Consequently, for the development and improvement of HEV/EV power converters, this work is focused to the following technological aspects:

- Alternative power conversion architectures. The main topologies that can be implemented in the HEV/EV power train are described and analyzed, taking into account the alternatives that best adapt to the technical requirements of this kind of applications.

- New power semiconductor devices. New technological goals and challenges can only be achieved through the usage of new materials. Wide bandgap (WBG) semiconductors, especially gallium nitride (GaN) and silicon carbide (SiC) based electronic power devices, are the most promising alternatives to silicon (Si).

- Analysis of routing, connection and assembly techniques of power modules. Taking into account the strict requirements of efficiency, reliability and cost, a review and proposal of new layouts for the power conversion stages are necessary, as well as diagrams and parallelization techniques for the circuits, focusing on the available technologies.

Based on these aspects, this thesis evaluates the power semiconductor alternatives that can be implemented in HEV/EV applications, as well as their connectivity in order to obtain the required power densities, focusing on the semiconductor parallelization technique. Due to the lack of scientific, commercial and industrial information, this work proposes and verifies complete design criteria for the design of power modules.