Design, Voltage Mode Control and Non-ideal Analysis of a Low Voltage-High Current Synchronous Buck Converter

Year 2017, Volume: 17 Issue: 2, 3377 - 3385, 27.07.2017

Barıs Yıldız Gokhan Altıntas Mehmet Onur Gulbahce , Derya Ahmet Kocabas

Abstract

Synchronous and
non-synchronous buck converters are uninsulated DC-DC converters which are
widely used in any application that needs low voltage and high current.
Switches are accepted as ideal during simulations of these converters in order
to simplify the analysis. Non-ideal case can be analyzed by adding the
resistances of switches and inductances as components to simulation. In this
study, steady state and transient state are both analyzed for non-ideal case
for continuous conduction mode by designing a 225 W synchronous buck converter.
Simulations are performed in MATLAB/Simulink by calculated design parameters. A
digital controller was designed according to simulation results in order to
control the output voltage. Stability analysis for the designed converter was
achieved. In the second part of the study, converter was manufactured and
designed controller was embedded to a DSP based microcontroller. The
performance of the system was investigated by testing the designed circuit under
variable load and input voltage conditions and a comparison between simulation
results for non-ideal case and practical results was made.

Keywords

switch-mode power supply, converter, synchronous buck, transient state, steady state, stability, C2000 Piccolo LaunchPad

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