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.
In this paper, a novel high step-up single switch DC–DC converter with soft switching is presented. The main application of this converter is the connection of photovoltaic (PV) system to a 400[Formula: see text]V DC-bus. The proposed converter achieves high step-up voltage gain with small duty cycle by a combined boost and fly-back topology. Also, its switch voltage stress is lower than the output voltage. Besides, in the proposed converter, any auxiliary switch or magnetic core has not been used — therefore, the number of converter components has not been increased much in comparison with the conventional boost-fly-back converter. The operation principles of the converter and its theoretical operation waveforms are presented. In order to evaluate the theoretical analysis, a prototype of the converter is designed and experimentally implemented. The practical results are presented for a 100[Formula: see text]W boost-fly-back converter with input voltage of 40[Formula: see text]V and output voltage of 400[Formula: see text]V. Also, the output capacitor is designed to have less than 1% ripple on output voltage.
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