The uni-polar sinusoidal pulse width modulation full- bridge transformer-less photovoltaic (PV) inverter can achieve high efficiency by using latest super junction metal–oxide– semiconductor field- effect transistor (MOSFET) together with silicon carbide (SiC) diodes. Though, the MOSFETs are definite to use in transformer-less PV inverter due to the low reverse- recovery characteristics of the body diode. In this paper, family of new transformer-less PV inverter topology for a grid-tied operation is projected by the super-junction MOSFETs and diodes as there is no requirement of reverse-recovery response for the main power switches for unity power operation. The added clamping branch clamps the freewheeling voltage at the half of dc input volt age during the freewheeling period. As a conclusion, the common-mode voltage kept constant during the whole grid period that reduces the leakage current considerably. Furthermore, dead time is not important for main power switches at both the high-frequency commutation and the grid zero crossing instant, results low-current deformity at output. Finally, a 1-kW prototype is built and tested to verify the theoretical analysis. The experimental results show 98.5% maxi mum efficiency and 98.32% European efficiency. In addition, to show the effectiveness, the proposed topology is compared with the other transformer-less topologies.
