Conference Papers

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

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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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    Hybrid simulation method using MATLAB/SIMULINK and PSPICE for studying the dynamics of the dc-dc converters with linear controllers
    (Institute of Electrical and Electronics Engineers Inc., 2014) Shetty, C.
    There are numerous simulation tools for studying electrical and electronic circuit system dynamics. Most of the times, we stick to a specific software package for studying the behavior of a circuit- it depends either on acquaintance with the software or on accessibility. However, it is good to carefully evaluate the advantages and shortcomings of each package prior to selecting one for a given set of objectives. In this paper, it has been demonstrated how one can combine both the popular simulation tools MATLAB/SIMULINK and PSPICE to study the dynamics of the dc-dc converters. The introduced co-simulation method has advantages like elimination of the laborious process of development of transfer function of the power stage for designing the controller, get rid of convergence problem and truncation of simulation time. The method proposed can be adapted by beginners who are very new to the designing of switching regulators for the quick understanding of dynamics of the converter. Down converter with voltage mode control is used to verify the proposed method. This can also be extended to higher order converters, like Cuk and SEPIC, where deriving the transfer function of a plant is quite tedious process, apart from above mentioned second order converter. Also, simulation with idealized models and detailed models has been discussed in the paper. © 2014 IEEE.