A single-phase five-level inverter

The present invention discloses a single-phase five-level inverter, comprising a common ground three-level conversion circuit, filter circuit and the frequency inverter circuit; an inverter embodied the present invention comprises six power switches S1 ~ S6, two diodes D1 ~ D2 and the single-phase output filter F. Output of the inverter of the present invention is a five-level inverter having a high efficiency, high reliability, simple control characteristics; while the present invention by way of the voltage clamp, the effective elimination of the non-isolated grid inverter system the presence of high frequency common mode current hazard; therefore the inverter according to the invention is very suitable for the non-isolated photovoltaic grid system.