DIGITAL CONTROL OF SWITCHING POWER CONVERTERS

This report describes the design of a digital controller that capable to control the
switching action of Buck converter. It focuses on how to generate the DPWM signal
in order to vary the ON/OFF condition of the low powerBuck converter switch. The
main objective of this project is to have a controller that capable to produce a stable
and high resolution of output voltage with high switching frequency response. Two
(2) types of computer simulation have been carried out in this project which are the
PSpice and MATLAB simulation. The PSpice simulation has been used to verify that
the calculated parameters confirm the Buck converter operating in continuous
conduction mode. The simulation results obtained in the PSpice simulation have been
verified that the calculated parameters such resistor, inductor and capacitor value can
be used for Buck converter circuit operating in continuous conduction mode. All the
results obtained, except for the output current ripple are within ±10 % acceptable
limit of percentage differences with its design requirements. The MATLAB
simulation has been used to design the Buck converter system together with its digital
controller part. The simulation results in MATLAB do not achieve the desired
objectives because of the problem in setting the PID compensator coefficient which
leads to a few simulation errors.