Single Phase Semi Converter

single-phase-semi-converter
SINGLE PHASE SEMI CONVERTER

Aim

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.


Apparatus required

  • Single phase semi converter kit
  • Patch cards
  • Power card
  • CRO
 

Circuit Diagram



circuit--diagram-for-single-phase-semi-converter


Procedure

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

mimic-diagram-for-single-phase-semi-converter
 
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, 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.

Model Waveform



model-waveform-for-single-phase-semi-converter


Pulse For SCR



pulse-for-single-phase-semi-converter


Model Graph



model-graph-for-single-phase-semi-converter


Firing angle α variation



firing-angle-for-single-phase-semi-converter


Observation

S.NO

OFF Time(ms)

ON Time(ms)

Alpha(α in Degree)

Vo(Volts)

1

4

6

72

2

 

 

 

 

3

 

 

 

 

4

 

 

 

 

5

 

 

 

 


 

Model Calculation

1. Total Time Period



total-time-period--for-single-phase-semi-converter


2. The Average Output Voltage


average-output-voltage-for-single-phase-semi-converter-

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