Non-isolated DC-DC converter for high-step-up ratio applications

This paper presents a new Zero Voltage Switching (ZVS), non-isolated, boost converter for high voltage gain (greater than 10x) applications. A coupled inductor and two capacitors are used to enlarge the voltage gain of the power converter, without the need for extreme PWM duty ratio. Compared to similar power converter topologies presented in the literature, an important advantage of the proposed power electronic converter is the reduced voltage stress on the semiconductor devices. In this paper, the principle of operation of the circuit is described in full detail. Furthermore, experimental results, based on a 250W prototype power converter, are presented to validate the performance of the system. The proposed dc-dc power converter is particularly well suited to electrical vehicle and renewable energy applications, which typically have low input voltage and high output voltage requirements.