TITLE:
Comparative Analysis of Analog and Digital Controllers for Negative Output Superlift Luo Converter (NOSLC)
AUTHORS:
Chamundeeswari Vinayagam, Seyezhai Ramalingam
KEYWORDS:
Proportional-Integral, Fuzzy, Sliding Mode Control, Digital Controller
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.8,
June
16,
2016
ABSTRACT: This paper focuses on the
comparative study of analog and digital control techniques for Negative Output
Superlift Luo converter (NOSLC). NOSLC is a high gain converter in which the
positive source voltage is converted into a negative load voltage. Though the
negative load voltage is produced effectively, there is lot of non-linearities
that affects the voltage level. To overcome this, analog controllers like
Proportional-integral (PI), fuzzy PI and a sliding mode controller (SMC) were
proposed for NOSLC. However PI controller does not respond to changes in
operating point, fuzzy PI is based on the systematic approach and proved to be
a trial and error oriented method and SMC brings an oscillation in the duty
cycle. Therefore, to overcome these drawbacks, a digital control technique
using PIC microcontroller is proposed in this paper which provides high
versatility and programmability approach. Simulation studies are carried out in
MATLAB and the performances of these controllers have been investigated for the
proposed DC-DC converter. A prototype of the NOSLC converter is built by
employing digital control and the results are verified experimentally.