Hydrogen Fuel Cell is the ideal alternative for emission-free, long-range, heavy payload transportations. Inside the fuel cell powertrain system, the dc/dc converter serves as an “electric gearbox”, matching voltage differences between fuel cell output and the electric motor drive input, while actively participating in the fuel cell control. Having a low input current ripple, high efficiency, high power density and strong immunity against electromagnetic interferences are all very critical to boost the fuel cell powertrain overall performance and durability.