Experiment 9: Single Phase AC Phase Controlled Rectifier with R-Load

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Objective

To construct a Single Phase AC Phase Controlled Rectifier with R-Load using TMS320F28027F.

Circuit Diagram

Circuit Diagram for Single Phase AC Phase Controlled Rectifier with R-Load
Fig 8.2) Circuit Diagram for Single Phase AC Phase Controlled Rectifier with R-LOAD

Connection Diagram for Single Phase AC Phase Controlled Rectifier with R-Load

Connection diagram for Single Phase AC Phase Controlled Rectifier with R-Load
Fig 8.3) Connection Diagram for Single Phase AC Phase Controlled Rectifier with R-LOAD

Procedure for Single Phase AC Phase Controlled Rectifier with 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

Single Phase AC Phase Controlled Rectifier with R-Load
Fig 8.4) Simulink file of Single Phase AC Voltage Controlled Rectifier with R-LOAD

3.Simulation Waveforms

Simulation Waveforms
Fig 8.5) Simulink Output Waveforms of Single Phase AC Phase Controlled Rectifier with R-LOAD

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 pulse generating section alone by replacing the input and output ports with GPIO blocks.

7.Code Generation for TMS320F28027F LaunchPad  using Matlab

Code Generation using Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD
Fig 8.6) Code Generation using Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD

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

9.Place the LaunchPad TMS320F28027F on the board slot as shown in Fig2.5.

10Power 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 point for ZCD and pulses from LaunchPad
 Fig 8.7)Test point for ZCD and pulses from LaunchPad

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

DSO Waveforms of the Pulses generated with ZCD

16.Now verify the pulses across (G1, K1) and (G2, K2).

Test points to verify the pulses across (G1, K1) and (G2, K2).
Fig 8.9) Test points to verify the pulses across (G1, K1) and (G2, K2).

17.Below Screenshot shows the Pulses applied to SCR for Triggering

Waveform of the pulses applied to SCR captured in DSO
Fig 8.10) Waveform of the pulses applied to SCR captured in DSO

18.Now connect the Power Circuit as per the Circuit Diagram shown in (Fig: 8.2) or as per the Connection Diagram shown in (Fig: 8.3). 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.Analyse 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

 Waveform of the pulses applied to SCR captured in DSO
Fig 8.11) Waveform of the pulses applied to SCR captured in DSO

23.Hardware Output waveforms

Hardware-Output-waveforms
Fig 8.12) Hardware Output model waveforms for Single Phase AC Voltage Controlled Rectifier with R-LOAD

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

tablelation
Table 8.1) Tabulation for Single Phase AC Phase Controlled Rectifier with R-Load

 Model Calculations

total-time-period-for-half-cycle
output voltage

Conclusion

Thus Single Phase AC Phase Controlled Rectifier with R-Load 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 8.13) Fixed firing angle in Matlab for Single Phase AC Phase Controlled Rectifier with 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 AC Phase Controlled Rectifier with R-LOAD
Fig 8.14) Key function block in Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD
Vary the firing angle step increment for key in Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD
Fig 8.15) Vary the firing angle step increment for key in Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD

Change the value by opening frequency3 to any value of incremental step for E.g. as 5 and Ok. Now by pressing the key once it increments by 5degree.

Entering the constant value in parameters block in Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD
Fig 8.16) Entering the constant value in parameters block in Matlab for Single Phase AC Phase Controlled Rectifier with R-LOAD

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