chopper controlled dc drive, Study Guides, Projects, Research of Power Electronics

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Aim: To analyze the control of Separately Excited DC motor using different classes of chopper. Apparatus: MATLAB software Class A chopper: Circuit diagram :

Waveforms:

Chopper fed DC drives

FFT analysis: Output voltage

Outputcurrent

Chopper fed DC drives

Inputcurrent:

Class C chopper: Circuit diagram:

Chopper fed DC drives

Output Current

Input Current

Class E Chopper: Circuit diagram:

Chopper fed DC drives

Waveforms:

FFT analysis: Output Voltage:

Chopper fed DC drives

Calculations:

Observations and Results:

1. Class A is used for motoring applications
2. Class C is used for both forward motoring and braking applications and 3 ) Class E is used for all the four quadrant operations.
3. Class C chopper is a parallel combination of class A and class C chopper.

S.No Class of chopper FFT ANALYSIS Output Current Output Voltage Input Current

1. CLASS A 78.46% 701.81% 275.21%
2. CLASS C 35.5% 35.5% 35.5%
3. CLASS E 79.88% 79.88% 79.88%

Conclusion: Thus, chopper fed dc drives is analyzed and their graphs and FFT analysis are plotted.

Chopper fed DC drives