An integrated single-phase dual-supply boost inverter with high reliability

In this paper, an integrated single-phase dual-supply boost inverter (DSBI) with high reliability is proposed. The proposed inverter has two input sources, in which the two power supplies can supply power simultaneously or provide energy to the output terminal respectively. the proposed inverter has the advantage of reducing devices, which requires only four active switches and has the inherent features of shoot-through immunity. Moreover, it is not necessary to set the dead-time in PWM signals, improving the quality of the output ac voltage. By a simple unified modulation for the proposed converter, the functions of boosting and inverting can be realized. The steady-state analysis, operating principles, and parameter selection guidelines are provided. The proposed topology has been verified in a 250W prototype with satisfactory results.