Design and Implementation of Embedded Chopper with Bidirectional Dual Port DC_AC Converter for Wide Voltage Range Applications

Abstract

Hidden bidirectional DC-AC converter is one of the motivations from the existing power converter circuits. AC to AC conversions can be possible in electrical science by means of transformer. DC to DC converter is realised using solid state switches like MOSFET, BJT and IGBTS. This proposed work is about DCand#61663;and#61664;AC transformer i.e, solid state bidirectional AC-DC and DC-AC converter can perform all three operations such as step-up, step-down, and ideal operation. So, the proposed converter is named as three phase DC-AC converter. In the existing three phase inverter having three positive group switches and negative group switches. But in the proposed converter consists of two set of positive group switches. First set is similar like normal positive group switches which already available in the conventional converter called vertical group switches. Vertical group positive switches consist of IGBTs with anti- parallel diode. Second set of positive group switches consist of two anti-series IGBTs with anti-parallel diodes; second set switches are parallel to first set which are called horizontal switches. Negative group of switches are common switches for both vertical and horizontal switches. newlineHorizontal switches one end is directly connected with DC source and other ends are connected with negative group switches as well as AC source whereas vertical positive group switches one end are connected with DC-DC converter and another end is connected similar like horizontal group switches. Bidirectional DC-DC converter can perform ideal 1:1 operation; boost to buck operation in one side and boost-buck on another side. But some application demands both step-up and step-down operation from both sides. Here DC-DC converter role is hidden during direct conversion and active during two-stage operation, it s may be step-up or step-down on both sides. During 1:1 overall DC-AC conversion, this converter role is inactive or hidden; because DC source is bi-passed via direct switches to three phase three level converters