Design
and Simulation of a Buck Converter
Design and Simulation of a Buck converter to convert a
24
V
DC voltage from a small solar panel to a variable DC supply at the output with
less than 5% voltage ripple. You should have the duty cycle control to regulate
the output voltage of the DC-DC Buck converter. Please follow the following
steps and record the results in your final report.
1) Characterize the power semiconductor switch. You
will use MOSFET for your power semiconductor device.
(a)
Connect your device in a simple circuit and test the required gate voltages for
turn-on and turn-off of the device.
(b)
Vary the gate voltage and record the drain current, ID (for MOSFET). Show the
plot in your report and make comment when the device is fully conducting.
(c)
From step (b), use a gate voltage where the device is conducting. Vary the
Drain-to-Source voltage, VDS (for MOSFET) and record the ID values. Make a plot
using your data.
2) Select the switching frequency and other passive
component values (i.e. inductor, capacitor and MOSFET sizes) for 12 V, 9 V and 30 V
outputs with less than 5% voltage ripple.
3) Draw the Buck converter (without any controller) in
a LTSPICE circuit simulator and simulate the converter circuit. Show the
voltage outputs for different duty cycle ratios. Please use MOSFET to implement
the diode in your circuit. Simply use two MOSFETs and complimentary gate
pulses.
4) Theoretically derive the converter ratio, M(D), and
Power Efficiency (η) of the Buck converter and make MATLAB plots of the M(D)
and η parameters.
Make a comprehensive final project report (IEEE
format).