Browsing by Author "Shetty, C."

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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.
A quick and simplified approach for understanding the dynamics of the SEPIC converter for low voltage applications: Simulation study
(Institute of Electrical and Electronics Engineers Inc., 2015) Shetty, C.
Designing the feedback compensator for the SEPIC (single ended primary inductance converter) converter is quite difficult due to the extreme amount of phase shift in the power stage and occurrence of double resonance. Hence the current mode control, which increases the complexity of the system, is the most commonly adapted for stabilizing the converter. However, the careful observation of the frequency response of power stage, which depends on the filter components and equivalent series resistance of the capacitor, of the power stage makes the process of controlling the dynamics of the converter easy. Sometimes the frequency response of the power stage of the converter is free of double resonance with minimum phase shift and resembles the second order converter. So, one can develop the compensator network similar to the second order converter. In this paper, the design of controller for the SEPIC converter based on single loop feedback control is presented without the need of current mode control and its associated complexity. The presented analysis does not require the complicated methods such as the principal component analysis and the model order reduction but it is as simple as observing the bode plot of the power stage of the converter. The entire simulation is carried out in Pspice. Â© 2015 IEEE.
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.
A detailed application of TL494 PSPICE MODEL in designing switching regulators: An educational approach
(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.
Hybrid simulation method using MATLAB/SIMULINK and PSPICE for studying the dynamics of the dc-dc converters with linear controllers
(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.
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. Â© 2014 IEEE.
A quick and simplified approach for understanding the dynamics of the SEPIC converter for low voltage applications: Simulation study
(2015) Shetty, C.
Designing the feedback compensator for the SEPIC (single ended primary inductance converter) converter is quite difficult due to the extreme amount of phase shift in the power stage and occurrence of double resonance. Hence the current mode control, which increases the complexity of the system, is the most commonly adapted for stabilizing the converter. However, the careful observation of the frequency response of power stage, which depends on the filter components and equivalent series resistance of the capacitor, of the power stage makes the process of controlling the dynamics of the converter easy. Sometimes the frequency response of the power stage of the converter is free of double resonance with minimum phase shift and resembles the second order converter. So, one can develop the compensator network similar to the second order converter. In this paper, the design of controller for the SEPIC converter based on single loop feedback control is presented without the need of current mode control and its associated complexity. The presented analysis does not require the complicated methods such as the principal component analysis and the model order reduction but it is as simple as observing the bode plot of the power stage of the converter. The entire simulation is carried out in Pspice. � 2015 IEEE.
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
(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.
Studying the dynamics of the second-order DC-DC converter with single and multi-loop feedback for the optimum bandwidth
(2014) Shetty, C.
As far as the complexity of the current mode control is concerned, illogical choosing of the phase cross over frequency for a converter doesn't bring any significant advantages over the voltage mode control. So, one has to select the bandwidth carefully so that benefits of the current mode control will trade off with the complexity of implementing the scheme. The reported work emphasizes on the importance of choosing the optimum bandwidth in the current mode control which can claim all the benefits of this complex current mode control scheme. The advantages are: a) reduction in the order of the controller due to decreased phase boost demand b) scaling down in the size of the capacitor, inversely proportional to cross over frequency, of the compensator network and consequently demands very less current to drive as a network which prevents overloading of the output of the operational amplifier and, c) improved response speed. In this paper, for demonstration purpose, the dynamic performance of the non inverting synchronous up down converter, second order converter, is carried out for both the voltage mode and the current mode feedback with different cross over frequencies. The simulation is carried out in Pspice. � 2014 IEEE.
Studying the dynamics of the second-order DC-DC converter with single and multi-loop feedback for the optimum bandwidth
(Institute of Electrical and Electronics Engineers Inc., 2014) Shetty, C.
As far as the complexity of the current mode control is concerned, illogical choosing of the phase cross over frequency for a converter doesn't bring any significant advantages over the voltage mode control. So, one has to select the bandwidth carefully so that benefits of the current mode control will trade off with the complexity of implementing the scheme. The reported work emphasizes on the importance of choosing the optimum bandwidth in the current mode control which can claim all the benefits of this complex current mode control scheme. The advantages are: a) reduction in the order of the controller due to decreased phase boost demand b) scaling down in the size of the capacitor, inversely proportional to cross over frequency, of the compensator network and consequently demands very less current to drive as a network which prevents overloading of the output of the operational amplifier and, c) improved response speed. In this paper, for demonstration purpose, the dynamic performance of the non inverting synchronous up down converter, second order converter, is carried out for both the voltage mode and the current mode feedback with different cross over frequencies. The simulation is carried out in Pspice. Â© 2014 IEEE.