A New Topology of Single-Phase Common Ground Buck-Boost Inverter With Component Voltage Rating Reduction

The combination of conventional front-end DC-DC converter and H-bridge inverter has been proposed with common-ground (CG) characteristic voltage booting capability. However, it drawback low modulation index utilization which causes high component rating small conversion efficiency. In this paper, a new topology single-phase buck-boost (1P-CG-BBI) is presented to overcome existing drawbacks CG inverters. 1P-CG-BBI uses one more active-switch diode than traditional inverter. Note that the still shares same ground for DC input source AC output voltage, completely eliminates leakage current. A hybrid pulse width (PWM) technique introduced control stage. Accordingly, stage operates similar boost in positive half cycle. negative cycle, behaves as inverting converter. operation DC-AC can be controlled, independently. Consequently, significantly improved compared previous High tends reduce increase system comparison study discussed highlight these advantages. Simulation results conducted using PSIM software are considered verify laboratory prototype also developed further demonstrated accuracy theory. obtains 93.12% 91.83% efficiency at 550-W buck operating, respectively.