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Aim

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

Procedure

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



Class A

Mimic Diagram of Class A

Mimic Diagram of Class A

Class B

Class B

Mimic Diagram of Class B

Mimic Diagram of Class B

Class C

Class C

Mimic Diagram of Class C

Mimic Diagram of Class C

Class D



Class D

Mimic Diagram of Class D

Mimic Diagram of Class D

Class E


Mimic Diagram of Class E


Mimic Diagram of Class E