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# Basic Series Inverter

## Aim

To construct and test the performance of a Basic Series inverter using SCR

## Apparatus Required

• Trainer kit- basic series inverter -1 No
• Patch Chords - Sufficient Nos
• CRO - 1 No
• 10:1 CRO Probe - 1 No

## 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.

## Precaution Steps

• Switch ON SW2 and observe the pulse across the Triggering Pulse.
• Switch ON SW1 and observe the DC Voltage across Vs.
• Then Switch off SW1 and SW2.

## Experiment Steps

• The connections are made as per the circuit diagram given above.
• 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.
• 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
• Repeat the step 5.
• Repeat the experiment for different values of α and note down Vo.

Note: *If the connections are wrong the kit will get damage. *Please switch off the Kit when not in use.

a. PULSE for SCR

b. Across SCR

## Tabulation

 S.No Total time (T)(ms) F output(Hz) SCR Off time(ms) 1. 5 1 200

## Model Calculation

F= 1/T  Where,

F is output frequency,

T is total time period (i.e) 360o

F= 1/ (5*10-3)

= 0.2*103

= 200Hz