Energies, Vol. 19, Pages 1320: Wide-Input High-Step-Up DC–DC Converter with High Efficiency and High Voltage Gain

Energies, Vol. 19, Pages 1320: Wide-Input High-Step-Up DC–DC Converter with High Efficiency and High Voltage Gain

Energies doi: 10.3390/en19051320

Authors:
Yu-En Wu
Wei-Shan Lin

This study proposes a wide-input high-step-up DC–DC converter with high efficiency and high voltage conversion ratio. Two coupled inductors were adopted to achieve a parallel-charging and series-discharging energy transfer mechanism, and a voltage multiplier circuit was integrated to increase the voltage gain. The proposed topology uses a single pulse width modulation signal to drive two main switches synchronously, resulting in a low switch count and simple control circuit, concurrently achieving a wide input voltage range of 24 V to 48 V. The proposed converter comprises an active switched inductor combined with a voltage multiplier circuit, achieving a high voltage gain without relying on high duty cycle operation or high-turns-ratio design. The leakage energy of the coupled inductors was recycled through a passive-clamp circuit, effectively suppressing the voltage spikes of the switching devices and reducing their voltage stress. Finally, a 1 kW converter was implemented to verify the feasibility of the proposed topology through steady-state analysis, circuit simulation, and hardware experiments. The maximum efficiencies achieved were 94.7% and 96.2% at input voltages of 24 V and 48 V, respectively.