The document describes simulating a boost converter circuit using MATLAB/Simulink. Key parameters of the boost converter include an input voltage of 24V, output voltage of 48V at 100W, and switching frequency of 100kHz. The design procedure involves calculating the duty ratio, average inductor current, inductor and capacitor values to achieve the desired output voltage while limiting current and voltage ripple. Simulation results show the input voltage, switching signal, component voltages and currents match the theoretical values closely.

1. EXPERIMENT NO. 2 : SIMULATION OF BOOST CONVERTER
USING MATLAB / SIMULINK
Objective: Design a Boost Converter with appropriate value of parameters and simulate it.
Parameters of the 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: Boost Converter is a DC to DC converter (Step up Chopper) having output voltage
is greater than input voltage i.e. 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 Boost Converter and simulate it.
1. Duty Ratio:
D =
So, D=0.5

3. 2. Avg Current through Inductor (Theoretical):
IL = IS =
IL = 4.167 Amp.
3. Ripple in Inductor Current:
ΔIL (Theoretical) = 1.0417 Amp.
ΔIL =
So, L = 115.2µH
where f is switching frequency
4. Ripple in Output Voltage:
ΔVo (Theoretical) = 0.048V
ΔVo =
So, C = 217µF
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 = -48 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 = 48V
5. Current through Inductor:
Avg. Current through Inductor (Practical)
IS = IL = 3.765Amp.
Ripple in Inductor Current (Practical)
ΔIL = 0.9Amp.

7. 6. Output voltage:
Output Avg. Voltage (Practical)
Vo= 47.75V
Ripple in Output Voltage (Practical)
ΔVo = 0.05V