Issue link: https://iconnect007.uberflip.com/i/1540984
76 SMT007 MAGAZINE I NOVEMBER 2025 T H E ROA D TO R E L I A B I L I T Y S E R I ES by S ta nto n Ra k , S F Ra k C o m p a ny The silent, seamless propulsion of an EV masks the incredible complexity and engineering finesse required to make it all hap- pen. Beneath the vehicle's floor or under its hood lies a dense cluster of power electronics systems comprised of coordinated, high-performance mod- ules that collectively control, convert, and condition energy from the battery to the wheels. These sys- tems not only govern how smoothly an EV accel- erates or how efficiently it uses its charge but also play a defining role in the long-term reliability, safety, and serviceability of the vehicle. At the core of these systems are three founda- tional technologies: the battery management sys- tem (BMS), traction power inverter/DC-DC con- verter, and onboard charger (OBC). Their interde- pendence, power density, and harsh operating environment create both opportunities for innova- tion and challenges for durability. Each module is shaped by evolving design-for-reliability (DFR) prac- tices that span materials science, electrical engi- neering, and software design. Battery Management System (BMS): The Nerve Center While the lithium-ion battery pack holds the energy that powers the vehicle, the BMS ensures it can be used safely, efficiently, and predictably. Acting as both guardian and gatekeeper, the BMS monitors critical parameters such as state of charge (SOC), Inside the Machine: Power Electronics Driving the Road to Reliability ▼ Key E V e l e ct ro n i c c o m p o n e nt s i n a n a l l - e l e ct r i c ve h i c l e. ( S o u rc e : U S D O E 1 )