Author(s)

Chamundeeswari Vinayagam¹, Seyezhai Ramalingam²

¹Department of EEE, St. Joseph’s College of Engineering, Chennai, India.
²Department of EEE, SSN College of Engineering, Chennai, India.

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.

Proportional-Integral, Fuzzy, Sliding Mode Control, Digital Controller

Vinayagam, C. and Ramalingam, S. (2016) Comparative Analysis of Analog and Digital Controllers for Negative Output Superlift Luo Converter (NOSLC). Circuits and Systems, 7, 1689-1700. doi: 10.4236/cs.2016.78146.