Forced Commutation of SCR

Forced Commutation of SCR

Tags: Forced Commutation of SCR, Commutation Technique for Class A, B, C, D and E, waveform for Class A, B, C, D and E, Circuit Diagram for Class A Commutation, Circuit Diagram for Class B Commutation, Circuit Diagram for Class C Commutation, Circuit Diagram fo,
Overall rating

To Study and observe the Forced Commutation of SCR by different methods.

Apparatus Required

  • Trainer kit- Forced Commutation of SCR -1 No
  • Patch chords - Sufficient Nos
  • CRO - 1 No
  • CRO Probe 1:10 is sufficient - 1 No


CRO Settings

  • Time (X) Axis : 5ms/div
  • Voltage (Y) Axis: 20V/div
  • Probe: 1:10 CRO Probe is suitable one.

Initial Settings

  • Ensure the 230V Power Supply is in proper with Tester.
  • Ensure the CRO is working properly with probe checking and proper ground line axis.

Experiment Steps

  • The connections are made as per the circuit diagram given above.
  • When the load is Rheostat, then it must be in maximum position.
  • Turn on the SW2 and observe the waveform across between G1&K1 and G2&K2. And ensure it is like triggering pulse given in model graph.
  • Turn ON SW1 and observe the waveform across the load.
  • Measure the X-axis time interval of ON time of Load Voltage and OFF Time of Load Voltage.
  • Adjust the value of Firing angle and note down the load voltage
  • Repeat the step 5.
  • Repeat the experiment for different values of α and note down Vo.

Circuit diagram

Class A


Mimic Diagram of Class A


Class B


Mimic Diagram of Class B


Class C


Mimic Diagram of Class C


Class D


Mimic Diagram of Class D


Class E


Mimic Diagram of Class E


Join the World's Largest Technical Community

we respect your privacy.