Three Phase Semi Converter

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To Construct Three Phase Semi Converter

Apparatus required

Three Phase Semi Converter Kit

☞Patch chords

☞Power chord

☞Lamp Load or DC motor


Circuit Diagram for Three Phase Semi Converter

Three Phase Semi Converter


CRO Settings

☞Time (X) Axis: 5ms/div

☞Voltage (Y) Axis: 20V/div

☞Probe: 1:10 CRO Probe is suitable one.

Initial Settings

☞Ensure the 440V Power Supply is in proper with Tester.

☞Ensure the CRO is working properly with probe checking and proper ground line axis.

Mimic Diagram for Three Phase Semi Converter

mimic-diagram-of-three-phase-semi-converter.jpg (450×323)

Experiment Steps

☞1. The connections are made as per the circuit diagram given above.

☞2. The Load must be Lamp Load or DC Motor.

☞3. Turn on the SW2 and observe the waveform across between G1&K1, G3&K3, and G5&K5. 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 a and note down Vo.


*If the connections are wrong the kit may get damage.*The load must be R and RL. Do not connect L Load alone


S.NOAlpha(α in Degree)Vo(Volts)

Model Calculation

Total Time Period



Above experiment was done and the result was verified with Motor Running.

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