Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Control theory & CMOS. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

A Schmitt trigger based on DDCCTA without any passive components

Abstract: Among various active building blocks, the Differential Difference Current Conveying Transconductance Amplifier (DDCCTA) is emerging as a very flexible and versatile building blocks for analog circuit design and has been used for realizing a variety of functions. In this paper, a new current-mode electronically-tunable Schmitt trigger circuit is proposed using Differential Difference Current Conveyor Transconductance amplifier (DDCCTA). The proposed Schmitt trigger consists of single DDCCTA block without any passive components which is advantageous from the point of view of an integrated circuit manufacturing. The performance of the proposed Schmitt trigger circuit is examined using Cadence and the model parameters of a 0.18 µm CMOS process.

Seasonal distribution of trace metals in suspended particulate and bottom sediments of four microtidal river estuaries, west coast of India

Abstract: The seasonal distribution of metals (V, Cr, Co, Cu, Ni, Zn, Pb, Mn, Fe, Al and Ti) in suspended and bottom sediments of four minor estuaries (Terekhol, Chapora, Sal and Talpona rivers) of Goa, Indi...

Enhanced Performance of an Asynchronous Motor Drive with a New Modified Adaptive Neuro-Fuzzy Inference System-Based MPPT Controller in Interfacing with dSPACE DS-1104

Abstract: This paper presents a photovoltaic system with maximum power point tracking facility. Maximum power point trackers are so important in photovoltaic systems to increase their efficiency. The system consists of a photovoltaic solar module connected to a DC–DC buck–boost converter and load. The adaptive neuro-fuzzy inference system (ANFIS)-based maximum power point tracking (MPPT) controller is used to track the maximum power. DC–DC boost converter and space vector modulation-based inverter are used to provide the required supply to the load. The proposed ANFIS-based MPPT improves the system efficiency even at abnormal weather conditions. Here a lot of reduction in torque and current ripple contents is obtained with the help of ANFIS-based MPPT for an asynchronous motor drive. Also, the better performance of an asynchronous motor drive is analyzed with the comparison of conventional and proposed MPPT controller using MATLAB simulation along with experimental implementation. The experimental implementation of MPPT with hardware setup is done using dSPACE real-time controller. Data acquisition and codes of the successfully simulated model can be linked and loaded directly to the dSPACE DS-1104 controller for real-time hardware operation. The simulation and the practical results represent that the proposed system tracked the maximum power accurately and successfully under different working conditions. Practical validations are also carried out and are represented.