Abstract
This study proposes a novel high step-up non-isolated dc–dc converter based on the classical Cuk converter with coupled inductor and voltage multiplier techniques. To further increase its voltage gain, the load is differentially connected between the input source and the output capacitor. The proposed converter presents reduced voltage stresses over the active switches and allows the design of low-volume magnetic devices. Its quasi-resonant operation mode guarantees zero-current-switching (ZCS) turn-off of diodes, whereas the current ripple of the magnetic devices can be utilised to assist zero-voltage-switching (ZVS) turn-on of active switches. A prototype circuit with 25–40-V input voltage, 400-V output voltage, and 200-W output power is built and tested to verify its performance. The highest obtained efficiency is 97.2% and the weighted California Energy Commission (CEC) efficiencies are >95.7% over the entire input voltage range.
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