A High-Gain Single-Stage Buck/Boost Inverter

The boost converter-based single-stage buck/boost inverter overcomes challenges that step-up voltage limitations of traditional voltage source inverter, the increased cost and control complexity of two-stage inverters, and the limited step-up range of single-stage impedance source inverters. Whereas, its ac output includes a dc bias at the value of dc source voltage and ac load voltage amplitude. Therefore, its boost ratio would be still limited because of the voltage rating limitation of practical power devices. This paper proposes a novel high-gain single-stage buck/boost inverter, without loss of low voltage stress and high boost ratio. The topology, operating principle, and modulation are disclosed. Simulation studies are carried out to demonstrate effectiveness of the proposed inverter.