Experiment 6: Single Phase Full Controlled Rectifier with RL-Load

Spread the love

Objective

To Construct a Single Phase Full Controlled Rectifier with RL-Load using TMS320F28027F.

Circuit Diagram for Rectifier with RL-Load

circuit diagram for Rectifier with RL-Load
Fig: 6.17) Circuit Diagram for Single Phase Full Controlled Rectifier with RL-LOAD

Connection Diagram for Rectifier with RL-Load

Rectifier with RL-Load
Fig: 6.18) Connection Diagram for Single Phase Half Wave Controlled Rectifier with R-LOAD for Positive Half Cycle

Procedure for Rectifier with RL-Load

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

2.Simulation in Matlab

Simulink file of Rectifier with RL-Load
Fig: 6.19) Simulink file of Single Phase Full Controlled Rectifier with RL-LOAD

3.Simulation Waveforms

Simulation Waveforms
Fig 6.20) Simulink Output Waveforms of Single Phase Full Controlled Rectifier with RL-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 Full Controlled Rectifier with RL-LOAD
Fig: 6.21) Code Generation using Matlab for Single Phase Full Controlled Rectifier with RL-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 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 and Pulse from LaunchPad
Fig 6.22) Test points from ZCD and pulse from LaunchPad

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

DSO waveforms of the Pulse generated from ZCD
Fig 6.23) DSO waveforms of the Pulse generated from ZCD

16.Now Verify the pulses across (G1, K1), (G2, K2), (G3, K3) and (G4, K4).

Test points to verify across (G1, K1), (G2, K2), (G3, K3) and (G4, K4).
Fig 6.24) Test points to verify across (G1, K1), (G2, K2), (G3, K3) and (G4, K4).

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

Waveform of the pulses applied to SCR captured in DSO
Fig 6.25) Waveform of the pulses applied to SCR captured in DSO

18.Now connect the Power Circuit as per the Circuit Diagram shown in (Fig: 6.8) or as per the Connection Diagram shown in (Fig:6.9). Verify the connection.

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

20Now 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

Connection Diagram
Fig 6.26) Connection Diagram

23.Hardware Output waveforms

Hardware Output model waveforms for Single Phase Full Controlled Rectifier with RL-LOAD
Fig: 6.27) Hardware Output model waveforms for Single Phase Full Controlled Rectifier with RL-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.

            T= b value ON time due to inductance from output voltage waveform using DSO in ms.

Tabulation

Tabulation for Single Phase Full Controlled Rectifier with R-LOAD
Table 6.2) Tabulation for Single Phase Full Controlled Rectifier with R-LOAD

Model Calculations

model-calcul-ation1

Output Voltage

Vo=(2Vpk/p)*( cosa-cosb)

 Where,

            Vpk= Input ac voltage in volt.

            a= Firing angle in degree.

            β = Extinetion angle.

E.g.

output-voltage

Conclusion

Thus Single Phase Full Controlled Rectifier with RL-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.
Single Phase Full Controlled Rectifier with RL-Load
Fig 6.28) Fixed firing angle in Matlab for Single Phase Full 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 Full Controlled Rectifier with R-LOAD
Fig 6.29) Key function block in Matlab for Single Phase Full Controlled Rectifier with R-LOAD
Vary the firing angle step increment for key in Matlab for Single Phase Full Controlled Rectifier with RL-Load
Fig 6.30) Vary the firing angle step increment for key in Matlab for Single Phase Full Controlled Rectifier with RL-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 Full Controlled Rectifier with RL-Load
Fig 6.31) Entering the constant value in parameters block in Matlab for Single Phase Full Controlled Rectifier with RL-Load

Leave a Reply

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

5 + 17 =

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