Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

This paper introduces eight novel interleaved non-isolated dc-dc converters with ultra-high step-up and zero voltage switching (ZVS) capabilities for renewable energy systems. To increase the gain, proposed benefit coupled inductors, high-frequency (HF) transformer, multiplier (VM) techniques. In comparison to other converters, which just inductors or HF transformers, these combinations of techniques make an additional degree freedom achieve high gains (more than 25 without extreme duty cycle). Besides, two active clamp circuits, including stages switch-capacitor VM cells, not only gain but also act as auxiliary circuit provide ZVS. Moreover, stored in leakage inductances is absorbed passed output by capacitors. The input current ripple reduced applying technique. stresses across power switches are clamped lower values can be controlled turn ratios transformer. theoretical performance fully explained. Also, compared more twenty latest converters. Finally, a 1 kW, 20 V/500 V laboratory prototype built prove advantages