Function of free wheeling diode in semiconverter

  • When the load is inductive, the load current circulates through free wheeling diode.
  • Actually, the semiconverter have the inherent freewheeling.
  • This freewheeling can take place through one SCR and one diode.
  • But if separate freewheeling diode is used, then freewheeling takes place through that free wheeling diode itself. This reduces losses that takes place in SCR and diode.