Stress Evaluation of Non-Isolated Converters Modified into Processing Partial Power

Partial power processing circuits handle only a portion of the power that is handled by the converter system and a sizable portion of the power goes from the source to the load directly. This helps to reduce the size of the converter and its cost. It also improves power density and minimises losses, leading to better efficiency. Such converters generally have an isolation between the source and the load using a transformer or a coupled inductor. A connection is made between the primary and secondary sides converting them into a partial power configuration. This paper analyses the voltage and current stresses on the switches of a partial power processing converter constructed using flyback, forward, isolated CuK, isolated Zeta and isolated Sepic converters, validates them with simulation results and brings out the improvement obtained in the stress levels. A comparative assessment is finally made across all these converter configurations.