The single stage photovoltaic microinverter based on couple of two-switch DC-DC flyback converters has been suggested. The results of simulation and experimental investigation for the case when photovoltaic microinverter operates in off-grid and grid-tied modes are presented. The proposed single stage microinverter is characterized by simple design and high efficiency.

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The transformer design impact on voltage spikes, which arise on the drain of flyback converter MOSFET switch transistor, has been investigated. The special experimental model of flyback transformer was developed. The impact of transformer core air gap, windings design and windings position in transformer bobbin on the voltage spikes was investigated. The ways for reduction of voltage spikes by variation of transformer design were estimated.