Grid-Connected Forward Microinverter With Primary-Parallel Secondary-Series Transformer

摘要: This paper presents a primary-parallel secondary-series multicore forward microinverter for photovoltaic ac-module application. The presented operates with constant off-time boundary mode control, providing MPPT capability and unity power factor. proposed multitransformer solution allows using low-profile unitary turns ratio transformers. Therefore, the transformers are better coupled overall performance of is improved. Due to multiphase solution, number devices increases but current stress losses per device reduced contributing an easier thermal management. Furthermore, decoupling capacitor split among phases, without electrolytic capacitors suitable be mounted in frame PV module. compared classical parallel-interleaved approach, showing efficiency wide range improving weighted efficiency.