Power Electronics & Drives Lab

DC Chopper ( Voltage and Current Commutated), Model: JC – 703

A SCR can be turned ON by applying a positive voltage of about a volt or a current of a few tens of milli-amps at the gate-cathode terminals. However, the amplifying gain of this regenerative device being in the order of the 108, the SCR cannot be turned OFF via the gate terminal. It will turn-off only after the anode current is annulled either naturally or using forced commutation techniques. These methods of turn-off do not refer to those cases where the anode current is gradually reduced below Holding Current level manually or through a slow process. Once the SCR is turned ON, it remains ON even after removal of the gate signal, as long as a minimum current, the Holding Current, Ih, is maintained in the main or rectifier circuit.


  • All Components are terminated with a connector for the study of Students.
  • One potentiometer is provided to vary the Frequency.
  • Inbuilt Power supply for Converter and triggering pulse.
  • Inbuilt resistive, Inductive load.
  • Power ON indication Switch for firing scheme and power circuit.
  • Detailed mimic diagrams are drowned to facilitate the experiments


  • Kit Working voltage:(220-240)VAC
  • Input Voltage: 30V DC
  • Output Voltage: 30V DC
  • Load Current:1A


  • Voltage and Current Commutated Chopper (VCC-10)
  • Patch cards
  • 2A Fuse
  • User Manual of Kit