Single Phase Semi Converter

Spread the love

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

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.NOOFF Time(ms)ON Time(ms)Alpha(α in Degree)Vo(Volts)
14672 
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-

Leave a Reply

Your email address will not be published. Required fields are marked *

2 × 2 =

This site uses Akismet to reduce spam. Learn how your comment data is processed.