An input current shaper with boost and flyback converter using integrated magnetics

In this paper, with a view to reduce the ripple content of the input current, boost inductor of a single stage single switch input current shaping converter is replaced by a coupled inductor, with one winding in the forward path and another in the return path of power flow. However, the input current ripple hinders efforts to meet electromagnetic interference (EMI) requirements. Minimization of input current harmonics to meet the agency standards implies improvement of power factor as well. For the purpose of economizing on magnetic material and reducing the loss in the magnetic material, the magnetic circuits of the coupled boost inductor and the isolating transformer of the flyback converter are combined on a single magnetic core making sure that they function independently. This will make the unit more compact.