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To get a high performance such as low THD input current and high power factor of both single and three phase rectifiers, the output of the rectifiers is normally switched. But, we can use this switching on input side which will enable us to maintain high power factor as there will be no displacement between the voltage and the current. In this paper, we have implemented such a three phase boost circuit practically and derived working formula of both the single phase and three phase circuit theoretically and numerically. Keywords-Ac-dc converters,THD,boost rectifier,input current shaping,least square method,newton's polynomial method.I.

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