To obtain DC voltage from AC input using Single phase Semi Converter with R load and RL load and also with freewheeling diode and without freewheeling diode.
☞Time (X) Axis : 5ms/div
☞Voltage (Y) Axis : 20V/div
☞Probe : 1:10 CRO Probe is suitable one.
☞Ensure the 230V Power Supply is in proper with Tester.
☞Ensure the CRO is working properly with probe checking and proper ground line axis.
☞The connections are made as per the circuit diagram given above.
☞The R Load must be 60W bulb or 200ohm/2A Rheostat. The Load is 120mH/2A.
☞When the load is Rheostat, then it must be in maximum position.
☞Turn on the SW2 and observe the waveform across between G1&K1, G2&K2, G3&K3, and G4&K4. And ensure it is like triggering pulse given in model graph.
☞Turn ON SW1 and observe the waveform across the R load and RL 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 and current.
☞Repeat the step 6.
☞Repeat the experiment for different values of α and note down Vo. Note*If the connections are wrong the kit will get damage.*The load must be R and RL. Do not connect L Load alone.
Pulse For SCR
Firing angle α variation
|S.NO||OFF Time(ms)||ON Time(ms)||Alpha(α in Degree)||Vo(Volts)|
1. Total Time Period
2. The Average Output Voltage