Soft switching design of isolated boost converter with coupled inductors

A soft switching design of an isolated boost converter with coupled inductors is investigated in this paper. Compared with the former proposed converter, reverse-recovery problem of secondary diodes is removed within the whole operation range and ZVS ON of the main MOSFETs is obtained as well. Moreover, the restricted range of duty ratio is enlarged to achieve soft switching and an optimal operation point is obtained with minimal ripple of input current when duty ratio approaches 0.5. At last, a 150W prototype for vehicle inverter with 10V to 16V input voltage, 360V output voltage is implemented to verify the design.