Dual converters are commonly used to operate the dc drives where the four-quadrant operation needed. Two back to back connected full controlled converters are called as dual converter. One of the converter works as a ac to dc converter and the other one works as a dc to ac converter. Thyristors are used for the switching operation which is controlled by the pulse generator. Open loop dual converter technique proposed in this paper. The Four quadrant operation of both the single-phase dual converter and the three-phase dual converter has explained using the Simulink model. All these implements can be used to control the speed or the torque using the open or closed loop system. © 2017 IEEE.