A new soft switching high step-up boost converter is proposed in this study. Coupled inductors technique is used along with voltage multiplier in order to provide high-voltage gain and reduce voltage stress across semiconducting elements. Using an active clamp circuit, soft switching condition is provided for both the main and auxiliary switch which reduces the switching losses and improves the circuit efficiency as well as power density. The reverse recovery problem of diodes is alleviated due to the existence of the leakage inductances of the coupled inductors in series with diodes. The circuit performance is investigated and theoretical analysis is provided. A 200 W 40 V input to 400 V output laboratory prototype of the proposed converter is implemented, and the experimental results show the proper performance of the proposed converter.
A new interleaved boost converter with high step-up gain is presented in this paper. The proposed topology integrates coupled inductors and floating-output capacitors technique into interleaved boost converter to provide high step-up voltage gain without extreme duty cycle. The voltage stress on the power switches and diodes is very low, so low-cost and highperformance semiconductor devices can be employed. Also, the reverse recovery problem of all diodes is mitigated and zero-current-switching (ZCS) turn-on operation of the main switches is established as well. In addition, the passive clamp circuits are employed to suppress the voltage spikes across the main switches during turn-off instants. The operating principles and steady-state analysis of the proposed converter in continuous condition mode are explained. Finally, the simulation and experimental results of prototype 25-400 V circuit with 200 W output power are provided to verify the performance of presented topology.
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