Abstract
Inverters are widely used in various applications. However, traditional inverter configuration basically belongs to a step/down topology. In other words, the maximum peak voltage of the output AC voltage is limited to the input DC voltage. Hence, in case a higher output voltage is needed, it is necessary to either cascade one more stage of step/up CD converter or add an step/up transformer. This will, of course, result in larger size, lower efficiency and higher cost. In view of there, it is the main objection of this thesis to develop a single stage step up/down inverter without using an extra transformer.Basically, the contributions of this thesis may be summarized as follows. First, a novel single stage step up/down inverter without using a transformer is proposed to extend operation range of the output AC voltage. In fact, due to the four-quadrant operation capability of the proposed inverter, the new inverter can also be operated as an AC to DC converter. Second, mathematical model of the proposed inverter is also derived for feedback controller design and implementation. Third, in order to achieve a better performance, a closed loop controller is also presented to satisfy the desired specification. Finally, a hardware prototype of the proposed inverter is constructed to verify the feasibility of the proposed inverter.