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Aim: Design a Buck-Boost converter using a MOSFET/IGBT and for switching frequency (fs) of 10KHz and duty ratio (D) of 0.3 & 0.7. Given, Load Resistance = 10Ohms, Supply Voltage =100V (DC) and L = 180µH, C=340µF. Plot the waveforms of load voltage and current and calculate the average values of output voltage and current.

APPARATUS REQUIRED: PSIM software. CIRCUIT DIAGRAM:

Fig1: circuit diagram of Step Up (Boost) converter.

OBSERVATION:

Fig2: output waveforms of Buck converter for D=0.3.

Fig3: output waveforms of Boost converter for D=0.7.

Calculations:

RESULTS: Parameters V˳(avg)(V) I˳(avg)(A)

Theoretical value D=0.3 D=0.7 30V 333.33V 3A 33.33A

Practical value D=0.3 D=0.7 49.25V 232.85V 4.92A 23.28A

Conclusion: Plot of Buck-Boost converter using MOSFET as a switch has been shown with average value of current and voltage both theoretical and practical.