Switching-Mode Power Supply Design =SMPS
According to Wipedia: SMPS can be classified into four types according to the input and output waveforms, as follows.
AC in, DC out: rectifier, off-line converter input stage.
DC in, DC out: voltage converter, or current converter, or DC to DC converter
AC in, AC out: frequency changer, cycloconverter
DC in, AC out: inverter