Single stage high-frequency non-isolated step-up sinusoidal inverter with three ground-side power switches

Abstract

Conventional high-frequency non-isolated inverter is generally composed of two stages, the step-up stage and the voltage inversion stage, and independent control strategy must exert on each stage. In order to solve the shortcoming, a topological solution (L3 topology) is proposed in this letter, combining the structure of the boost topology and the improved Watkins-Johnson topology to a single stage, realizing voltage step-up and inversion with only three ground-side power switches and single control signal. Theoretical analysis and experimental results validate the feasibility. The merits include ease of driving, small port current ripple, high efficiency, simple control strategy and so forth.