DC Chopper using SCR

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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

DC Chopper using SCR
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

mimic-diagram-of-dc-chopper.jpg (400×335)

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.NoF output(Hz)Vo output(V)
   

 Theory Waveform

theory-waveform1-of-dc-chopper.jpg (380×324)
theory-waveform2-of-dc-chopper

Output Waveform

output-waveform-of-dc-chopper

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