New topologies of active input current shapers to allow AC-to-DC converters to comply with the IEC-1000-3-2

This paper deals with the analysis of four new implementations of the recently proposed active input current shaper (AICS). These new implementations of AICS can be used with DC-to-DC topologies in which the voltage across the transformer is either a symmetrical waveform (e.g. half-bridge, push-pull or full-bridge) or an asymmetrical waveform (e.g. forward, flyback, SEPIC, Cuk or Zeta). Using some of these implementations, the size of the AICS inductors can be reduced and even integrated in only one magnetic core. As in the case of other converters with AICS, the new implementations allow us to reduce the line current harmonics in order to comply with the IEC 1000-3-2 specifications, maintaining all the features of standard DC-to-DC converters (e.g. fast transient response). Finally, the proposed topologies have been experimentally tested