Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Raju, A.B.

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    A detailed application of TL494 PSPICE MODEL in designing switching regulators: An educational approach
    (Institution of Engineering and Technology journals@theiet.org, 2013) Shetty, C.; Kadle, A.; Raju, A.B.
    This paper describes the application of TL494 PSPICE MODEL with OrCAD Capture for analyzing switching regulators, which can assist beginners like undergraduate students in understanding the switching regulators. This paper mainly focuses on application of simulation model as none of the literatures provides required information to work with TL494 simulation model. Although TL494 chip is a very simple chip as far as hardware is concerned, it is not easy work with Pspice model of TL494 without adequate knowledge about the Pspice software. The application of this chip's simulation model with OrCAD Capture is demonstrated with the help of buck converter. This application report can also be extended to other non-isolated as well as isolated converters.
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    A simplified approach to the first order approximations of a closed loop, non isolated dc-dc converter with synchronous rectifier circuit behavior by using the ORCAD PSPICE
    (Institution of Engineering and Technology journals@theiet.org, 2013) Shetty, C.; Kadle, A.; Raju, A.B.
    In this paper, we present the significance of computer simulation program, such as ORCAD PSPICE, in analyzing, first order approximations of circuit behavior, a closed loop, non-isolated dc-dc converter with synchronous rectifier circuit. Following techniques have been adopted to simplify the process of simulation. They are: (1) Ideal switches are incorporated in the power stage of the converter to eliminate the gate diver requirement which in turn reduces the simulation run time; (2) Diodes are connected in series with switches, which eliminates dead time control circuit, to prevent cross conduction of switches and (3) TL494 Pspice model, which is readily available in library of most of the versions of the ORCAD PSPICE, is employed for pulse width modulation. As an example, non-inverting synchronous buck boost converter is considered for demonstrating the approach. Simulation was carried out for an input voltage range of 6 to 35V and load resistance was varied from 12 to 48 Ohms. Output voltage was regulated at 12V for both input voltage and load current perturbation. Physical prototype was implemented and simulation result was tested for steady state output.
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    Implementation of Perturbation-Based MPPT Technique Using Model-Based Design
    (Springer Science and Business Media Deutschland GmbH, 2020) Angadi, S.; Yaragatti, U.R.; Yellasiri, Y.; Raju, A.B.
    Maximum Power Point Tracking (MPPT) algorithms are imperative in solar Photovoltaic (PV) systems. This paper presents a simple approach for real-time implementation of perturbation-based MPPT algorithms employing model-based design (MBD) and Rapid Control Prototyping (RCP). To validate the proposed approach, classic Perturb and Observe (P&O) algorithm is tested. Altair’s Embed software and low-cost Texas Instruments (TI) DSP controller is used for implementation. All the fundamental blocks required for the implementation of perturbation-based MPPT algorithms are discussed in detail. Hardware-in-Loop (HIL) simulation using Altair Embed for selection of appropriate sampling time and perturbation step size is demonstrated. The readers will also be presented with details of fundamental fixed point blocks of Altair Embed software for the implementation of other MPPT algorithms using low-cost controllers. © 2020, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.