A family of single-phase transformerless inverters with asymmetric phase-legs

In recent years, the photovoltaic (PV) transformerless inverters are becoming more and more popular, and a variety of inverter topologies have been proposed. With a review of the state-of-the-art transformerless inverter topologies and the related pulsewidth modulation (PWM) method, this paper proposes a family of transformerless inverter topologies with asymmetric phase-legs. PWM modulation and inverter operating modes are then detailed, experiment results demonstrate the validity of proposed inverter topology.