Experiment 1: Single Phase Half Wave Controlled Rectifier with R – Load for Positive Half Cycle

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Objective

To Construct Single Phase Half Wave Controlled Rectifier with R-Load for Positive Half Cycle using SCR and TMS320F28027F.

Circuit Diagram for Rectifier with R – Load for Positive Half Cycle

circuit diagram for Rectifier with R - Load for Positive Half Cycle
Fig 5.3) Circuit Diagram for Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle 

Connection Diagram forRectifier with R – Load

Connection diagram for Rectifier with R - Load for Positive Half Cycle
Fig 5.4) Connection Diagram for Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle

Procedure of Single Phase Half Wave Controlled Rectifier for Positive Cycle for R-LOAD

1.Power converter circuit has to be designed  and simulation is verified in Matlab as shown in figure below.

2.Simulation in Matlab

simulation in matlab
Fig 5.5) Simulink file of Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle

3.Simulation Waveforms

simulation waveforms
Fig 5.6) Simulink Output Waveforms of Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle

4.    After completion of simulation verification, Firing pulse generation circuit has to be detached to generate code for LaunchPad TMS320F28027F.

5.    Now follow the steps in CONFIGURATION SETTINGS TO INTERFACE TMS320F28027F WITH MATLAB.

6.    As shown below, use the Firing pulse generating section alone by replacing the Input and Output ports with GPIO Blocks.

7.    Code Generation for TMS320F28027F LaunchPad  using Matlab

Code Generation for TMS320F28027F LaunchPad  using Matlab
Fig 5.7) Code Generation using Matlab for Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle

8.    Verify all power to the Trainer Kit is in OFF status.

9.    Place the LaunchPad TMS320F28027F on the board slot as shown in Fig 2.5

10. Power up the LaunchPad using the USB cable connected with the PC/Laptop

11. Follow the steps in PROGRAMMING THE LAUNCHPAD TMS320F28027F USING CODE COMPOSER STUDIO.

12. After programming, LaunchPad is ready to Generate the Pulse. Press reset once.

13. Now connect the Isolation Transformer unit through 14pin cable to the board as Shown in Fig 2.11.

14. Now verify the power switch on the board is in OFF Status and power ON the Isolation Transformer Unit. Compare the ZCD and the generated Pulse from LaunchPad using Oscilloscope.

test points from zcd
Fig 5.8) Test points from ZCD and Pulses from LaunchPad

15.Below Screenshot shows theComparison of generated pulse with the ZCD.

P1 Pulse with ZCD

16.  Now verify the pulses across (G1, K1).

Test points of G1, and K1 to verify in DSO
Fig 5.10) Test points of G1, and K1 to verify in DSO

17. Below Screenshot shows thePulses applied to SCR for Triggering

Waveform of the pulses applied to SCR captured in DSO
Fig 5.11) Waveform of the pulses applied to SCR captured in DSO

18.  Now connect the Power Circuit as per the Circuit Diagram shown in (Fig: 5.3) or as per the Connection Diagram shown in (Fig:5.4). Verify the connection .

19.  Check the Fuse F1 is proper with (230V/1A) rating.

20.  Now switch ON the Main Power Switch on the Trainer Kit.

21.  Analyze the Output waveforms and current waveforms for various firing angle by pressing the Key (S3) in LaunchPad TMS320F28027F and tabulate the results.

22.  For waveforms in DSO

 Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle
Fig 5.12) Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle

23.  Hardware Output waveforms

Hardware Output model waveforms for Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle
Fig 5.13) Hardware Output model waveforms for Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle   

Details gathered

         TON = SCR ON time from Output voltage waveform using DSO in ms.

TOFF = SCR OFF time from Output voltage waveform using DSO in ms.

Alpha α = Calculated value using formula in degree.

Vo = Measured Output Voltage using Multimeter and Calculated Output voltage in Volts.

Vpk = Input AC voltage in Volts

 Tabulation

Tabulation for Single Phase Half Wave Controlled Rectifier for Positive Half Cycle for R-LOAD:
Table 5.1) Tabulation for Single Phase Half Wave Controlled Rectifier for Positive Half Cycle for R-LOAD:

Model Calculations

Model calculations

2.Output Voltage

  Vo=(Vpk/2p)*(1+cosa)

Where,

            Vpk= input ac voltage in volt.

            a= firing angle in degree

            (Eg.:)

Conclusion

Thus Single Phase Half Wave Controlled Rectifier with R-Load for Positive Half Cycle using TMS320F28027F was done successfully, Output waveforms and Input waveforms for various firing angle was analyzed and verified.

Additional Exercise

☞The below screenshot show ,How to configure an constant firing angle.

Additional Exercise
Fig 5.14) Fixed firing angle in Matlab for Single Phase Half Wave Controlled Rectifier for Positive Half Cycle for R-LOAD 

☞To Vary the firing angle by using keys (S3) in LaunchPad TMS320F28027F ,follow the steps  shown  below.

☞ Open the If Action Subsystem1.

Key function block in Matlab for Single Phase Half Wave Controlled Rectifier for Positive Cycle for R-LOAD
Fig 5.15) Key function block in Matlab for Single Phase Half Wave Controlled Rectifier for Positive Cycle for R-LOAD
Vary the firing angle step increment for key in Matlab for Single Phase Half Wave Controlled Rectifier for Positive Cycle for R-LOAD
Fig 5.16) Vary the firing angle step increment for key in Matlab for Single Phase Half Wave Controlled Rectifier for Positive Cycle for R-LOAD

Change the value by opening frequency3 to any value of incremental step for E.g. as 5 and Ok. Pressing the key will increment the firing angle by 5degree.

Controlled Rectifier for Positive Cycle for R-LOAD
Fig 5.17) Entering the constant value in parameters block in Matlab for Single Phase Half Wave Controlled Rectifier for Positive Cycle for R-LOAD

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