- It is also called as phase commutation, line commutation or AC commutation.
- The natural commutation is only possible in the AC circuit.
- No extra circuit is necessary in order to turn off the SCR.
- The SCR turns off automatically during negative half cycle of alternating supply when reverse voltage applied across SCR for sufficient time.
- The time period of the negative half cycle should be more than the turn off time of the SCR.
- There is no power loss in the circuit because no commutation circuit.
- Class F commutation is an example of natural commutation.
- It is possible only in the DC circuit.
- As there is no natural zero current in the DC circuit, extra commutation circuit ( which include L and C ) requires in order to turn off the SCR.
- The forced commutation may be voltage commutation or current commutation.
- Class A, Class B, Class C, Class D and Class E are example of forced commutation.
- Some power loss takes place in the commutation circuit.
You may also like :
