Effects of parasitic phenomena in half bridge with Super Junction MOSFETs suitable for UAV

There is an increasing interest in developing unmanned aerial vehicles (UAVs) for small size objects delivering. The efficiency and cost of the on board power converters are important aspects for their rapid spreading. Moreover, lifetime, safety, and reliability of the converter in the powertrain are crucial. In this perspective, voltage overshoots and oscillations due to the parasitic phenomena are important stresses to be cared. In this work, their effects in a half bridge converter have been analyzed since it can represent a leg of a three phase inverter feeding a motor of the UAV. Automotive grade super junction (SJ) MOSFET has been considered because it presents high reliability level with increased lifetime expectancy and it is less subjected to overshoot and oscillation issues. Moreover, SJ MOSFET is a mature technology with better cost. In this paper, an extensive parametric analysis has been carried out by performing several LTspice simulations to highlight the effects of the parasitic phenomena on both the drain source-voltage and efficiency. The results have been firstly validated, then useful design constraints have been identified.