Soft-switching flyback inverter with lossless passive snubber for AC module applications

Abstract

In this paper, a soft-switching flyback inverter for AC module applications is proposed. Flyback inverter is used in many power conversion applications like AC module due to its simple circuit for implementation. The conventional flyback inverter has some major problems. One of them is voltage spikes across the converter switch originated from transformer leakage inductor. Other problems are high voltage stress and low efficiency owing to switching losses. Therefore, a dual switch flyback inverter providing soft-switching condition using lossless passive snubber circuit is proposed. This circuit does not have any additional switch and thus, the control circuit is reliable and simple. Operating principles and control circuit of the proposed inverter are discussed. In order to justify the relevant theoretical analysis, simulation results are presented.