POWER ELECTRONICS
Forced Commutation of SCR
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Forced Commutation of SCR
(Class A, B, C, D, E)
Aim:
To Study and observe the Forced Commutation of SCR by
different methods.
Apparatus Required:
1.
Trainer kit- Forced Commutation of SCR
-1 No
2.
Patch chords
- Sufficient Nos
3.
CRO
- 1 No
4.
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.
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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:
1. The connections are made as per the circuit diagram given
above.
2. When the load is Rheostat, then it must be in maximum
position.
3. 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.
4. Turn ON SW1 and observe the waveform across the load.
5. Measure the X-axis time interval of ON time of Load Voltage
and OFF Time of Load Voltage.
6. Adjust the value of Firing angle and note down the load voltage
7. Repeat the step 5.
8. Repeat the experiment for different values of α and note down
Vo.
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Note:
If the connections are wrong the kit will get damage.
Circuit diagram:
Class A:
V
L
To CRO
Mimic Diagram of Class A:
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T
Class B:
V
L
To CRO
L
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T
Mimic Diagram of Class B:
Class C:
V
across C
To CRO
T
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Mimic Diagram of Class C:
Class D:
V
To CRO
T
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Mimic Diagram of Class D:
Class E:
V
T
To CRO
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Mimic Diagram of Class E:
Result:
Thus above experiments for Commutation ofClass A Method
1. Class B Method
2. Class C Method
3. Class D Method
4. Class E Method
are done and Waveforms are verified.
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