Design of high‐efficiency non‐insulated step‐up converters

Abstract

The design techniques of high‐efficiency non‐insulated step‐up converters were upgraded on the basis of a comprehensive model of power losses, also including several feeble effects whose contribution, although overshadowed at large power by conduction and switching losses, is relevant in the low‐power regime and at the maximum power point. The thorough loss analysis was used as a basis to design state‐of‐art high‐boost‐ratio three levels neutral‐point‐clamped dc–dc converters, whose experimental efficiency showed an outstanding agreement with theoretical predictions in a wide range of operating conditions.