A high-efficiency high step-up DC-DC converter with passive clamped coupled-inductor and voltage double cells

In this paper, a novel high-voltage gain converter is proposed, which is based on passive clamp coupled inductor, and two voltage double cells are added to extend the voltage gain. The voltage stress on the main switch is reduced with a passive clamp circuit; low on-state resistance of the main switch can be adopted to reduce the conduction loss. Furthermore, zero-current-switching turn-on is achieved to reduce the switching losses by introducing the small resonant inductor and the leakage inductors of coupled inductor. In addition, the reverse-recovery problems of the diodes are alleviated. The operating principle and steady-state analysis of the proposed converter are discussed in detail. Finally, a prototype is implemented to verify theoretical analysis.