A PWM control strategy for switched boost inverter

Switched Boost Inverter is a single stage dc-ac power converter, whose output voltage can be either greater or less than its input dc voltage. This converter can supply both dc and ac loads, simultaneously, which makes it suitable for microgrid applications. Also, this converter allows shoot-through of the inverter legs without causing any damage to the converter. In this paper, the principle of operation of the Switched Boost Inverter is explained in detail and the expression for its conversion ratio is derived. Also, a Pulse Width Modulation (PWM) control strategy for the Switched Boost Inverter is formulated and implemented using a simple analog circuit. The harmonics spectrum of the inverter´s output voltage with the proposed PWM technique is plotted and compared with that of a traditional voltage source inverter (VSI). Experimental results are provided to verify proposed converter and its control along with its theoretical analysis.