Abstract
In this paper, the design of a proportional integral controller (PIC) plus fuzzy logic controller (FLC) for the negative output elementary super lift Luo converter (NOESLLC) operated in discontinuous conduction mode (DCM) is presented. In spite of the many benefits viz. the high voltage transfer gain, the high efficiency, and the reduced inductor current and the capacitor voltage ripples, it natured with non-minimum phase. This characteristic makes the control of NOESLLC cumbersome. Any attempt of direct controlling the output voltage may erupt to instability. To overcome this problem, indirect regulation of the output voltage based on the two-loop controller is devised. The savvy in the inductor current control improves the dynamic response of the output voltage. The FLC is designed for the outer (voltage) loop while the inner (current) loop is controlled by the PIC. For the developed ?19.6 V NOESLLC, the dynamic performances for different perturbations (line, load and component variations) are obtained for PIC plus FLC and compared with PIC plus PIC. The study of two cases is performed at various operating regions by developing the MATLAB/Simulink model.
Highlights
The voltage lift (VL) technique is a relatively new technique to employ in dc-dc converter topologies
The fuzzy logic controller (FLC) is designed for the outer loop while the inner loop is controlled by the proportional integral controller (PIC)
This paper proposes a proportional integral controller (PIC) plus fuzzy logic controller (FLC) for the −19.6 V output negative output elementary super lift Luo converter (NOESLLC) working in discontinuous conduction mode (DCM)
Summary
The voltage lift (VL) technique is a relatively new technique to employ in dc-dc converter topologies. In the topologies discussed hitherto, the parasitic elements dissuade the output voltage and power transfer efficiency of dc-dc converters, while the VL technique can lead to improvement [1] [2] After enduring investigation, this technique has been lucratively applied for dc-dc converters. The negative output converters perform positive to negative dc-dc voltage-increasing conversion with high power density, high efficiency and cheap topology in simple structure. They are different from other existing dc-dc step-up converters and possess many advantages, including a high output voltage with small ripples.
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