The present invention relates to a technology for a power converting device with low costs and high efficiency by using a single-stage forward-flyback for implementing a solar micro inverter that is applied in a solar power system to generate power by using solar energy. A forward-flyback converter according to the present invention has an advantage that input power is applied on a load regardless of switching on/off and the advantage improves the usage rate of a transformer and power density is higher in comparison with the forward or flyback converter. Also a reset winding is not required for a forward converter operation, so while switching off, through a secondary diode, the magnetizing current of the transformer does not occur and therefore it is possible to use power efficiently.
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