A High Step-Up Converter with Continuous Input Current and Auxiliary Circuit to Realize Soft-Switching Performance

In this study, a single switch DC-DC converter with soft-switching cell is introduced. Coupled-inductor (CI) with switched-capacitor (SC) techniques are combined and implemented in this structure to boost the voltage gain. Thus, there is no need high duty cycles, which increase converter stability. Moreover, the applied soft-switching cell provides a zero voltage switching (ZVS) condition for the main switch. Furthermore, zero current switching (ZCS) conditions for the auxiliary switch and all power diodes are provided. Also, the clamp capacitors avoid high spikes across switches, due to the stored energy of the leakage inductances of magnetic elements. Thus, it is possible to use switches with low-voltage stress, which increasese the converter efficiency. Moreover, PSIM simulation results with 48V input, 400V output voltages, and 300W output power are provided in detail in this study.