Buck Boost Converter with simulation model.pdf
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The document describes simulating a buck/boost converter using MATLAB/Simulink. It provides parameters for an input voltage of 24V, output voltage of 48V at 100W. It then outlines the theory, design procedure, and parameters calculated for an inductor value of 102.5μH and capacitor value of 288.6μF. The simulation model is shown and results presented including waveforms for the input voltage, switch signal, voltages across components, inductor current, and output voltage.
Buck Boost Converter with simulation model.pdf
- 1. EXPERIMENT NO. 3 : SIMULATION OF BUCK / BOOST CONVERTER USING MATLAB / SIMULINK Objective: Design a Buck / Boost Converter with appropriate value of parameters and simulate it. Parameters of the Buck / Boost Converter: Input voltage: 24V Output Voltage: 48V Output Power: 100W Switching Frequency: 100kHz Ripple in Inductor Current: 25% Ripple in Output Voltage: 0.1% Theory: Buck/Boost Converter is a DC to DC converter (Step up/down Chopper), By adjusting Duty Ratio we can use either as Buck Converter (Vo < Vin) or Boost Converter (Vo > Vin) Duty Ratio D = = Circuit Diagram and Theoratical Waveforms:
- 2. Design procedure and final design parameters obtained: For getting desired response (VO = 48V) first we will design L & C by using given parameters. By using L & C we will design a Buck/Boost Converter and simulate it. 1. Duty Ratio: D = So, D=0.666
- 3. 2. Avg Current through Inductor (Theoretical): IL = IS + IO = + IL = 6.25 Amp. 3. Ripple in Inductor Current: ΔIL (Theoretical) = 1.5625 Amp. ΔIL = So, L = 102.5µH where f is switching frequency 4. Ripple in Output Voltage: ΔVo (Theoretical) = 0.048V ΔVo = So, C = 288.6µF 5. Load Resistance: RL (Fixed) = = 23.04Ω
- 4. 6. Simulation configuration parameters: Here we are taking 100 Samples for each Time period So, Sampling frequency is 100 times of switching frequency(100kHz). So, Sampling Time Period = 100nSec. 7. Simulation Model of Buck Converter:
- 5. Results: 1. Source Voltage Waveform: Vin = 24V 2. Switching signal for turn ON/OFF to MOSFET: 3. Voltage Across the Diode: When Diode is OFF VD = 72 V When Diode is ON VD = -0.8V
- 6. 4. Voltage across the Switch/MOSFET: When MOSFET/switch is ON VSW = 0.8V When MOSFET/switch is OFF VSW = 72V 5. Current through Inductor: Avg Current through Inductor (Practical) IS = IL = 6.25Amp. Ripple in Inductor Current (Practical) ΔIL = 1.5Amp.
- 7. 6. Output voltage: Output Avg. Voltage (Practical) Vo= 46.37V Ripple in Output Voltage (Practical) ΔVo = 0.041V