Download mosfet based boost converter

MOSFET BASED BOOST CONVERTER
AIM
To design the boost converter and evaluate the performance.
PRINCIPLE
Boost converter
A Boost DC-DC converter is essentially a step up chopper for which the average output voltage is
higher than the input voltage. Hence the name is boost. The circuit operation can be divided into 2
modes
Mode 1 begins when MOSFET is switched on at t=0. The input current, which rises flows through
filter inductor L, and switch.
Mode 2 begins when the MOSFET is switched off at t=t1. The current that was flowing through the
switch through L,C, load and diode Dm. The inductor current falls initial MOSFET turned on the next
cycle . The energy stored in inductor L is transferred to the load
.
CIRCUIT DIAGRAM
OBSERVATIONS
SL NO
DUTY RATIO
OUTPUT
VOLTAGE
VOLTAGE AND CURRENT WAVE FORM
PROCEDURE
1. Simulated the given circuit diagram using Matlab simulink.
2. Observe and record the load voltage and load current.
DESIGN
Given:
Vs , input voltage
=
5V
Va, Required output voltage
=
15V
Average load current, Ia
=
0.5A
Frequency
=
25kHz
∆I = 0.89A & ∆Vc = 60.61mV
R = Va/Ia = 15/0.5 = 30Ω
Va = Vs/(1-k) or k = 2/3 = 0.6667
L = [Vs*(Va-Vs)]/[f*Va*∆I] = 150µH.
C = Ia*k/f*∆Vc = 220µF
RESULT
The boost converter is designed and evaluated its performance.