When the SCR came into use, a DC to DC converter circuit was called a chopper. Nowadays, a SCR is rarely used in a DC to DC converter. Either a power BJT or a power MOSFET is normally used in such a converter and this converter is called a switch mode power supply. A switch mode power supply can be of one of the types listed below:

  • Step down switch mode power supply
  • Step up chopper
  • Fly back converter
  • Resonant converter

The typical applications for a switch mode power supply or a chopper are:

  • DC drive
  • Battery charger
  • DC power supply