Aim
To construct and analysis of DC Chopper circuit..
Apparatus required DC Chopper kit
☞- 1 Nos
☞Patch cards – Required Nos
☞Power card – 1 Nos
☞CRO – 1 Nos
Circuit Diagram for DC Chopper using SCR
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.
Mimic Diagram for DC Chopper using SCR
Experiment Steps
☞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 and G2&K2. 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 VGS and note down Vo.
Note: *If the connections are made wrong the kit may get damaged.
Tabulation
| S.No | F output(Hz) | Vo output(V) |
Theory Waveform
Output Waveform
