Electrical Engineering

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Shiv Nadar University

Variable frequency drive of single-phase induction motor can have many potential advantages, like reduced inrush current during starting, high starting torque, possibility of higher efficiency, more tolerant to variation in grid supply voltage etc. Many of the existing electrical gadgets use single-phase induction motor of capacitor start / capacitor-run type. A typical example is the motor used in household refrigerators. In this application the starting torque requirement is high. It will be good if the motor starts with reduced inrush current and if the amount of cooling by refrigerator is controlled by variable speed operation of the motor. This work proposes a power electronic circuit which can be incorporated with some change in the existing wiring circuit of the refrigerator. © 2015 IEEE.

(SoE) School of Engineering

2015 IEEE International WIE Conference on Electrical and Computer Engineering, WIECON-ECE 2015

Design and implementation of a variable frequency drive for single-phase induction motor

Research on developing the applications of Wireless Power Transfer System (WPTS) has increased considerably during last few years. Due to functional and environmental benefits, charging of electric vehicles via WPTS has been contemplated in academic and industrial research. The WPTS based on Magnetic Resonant Coupling Technique (MRCT) is considered as an efficient way for contactless power transfer over medium distances (up to about 20 to 30 centimeters). This paper presents a comprehensive MATLAB/SIMULINK based model for such a system. The parameters of the model are derived from mathematical equations presented in the paper. The performance of the model is also verified experimentally. Performance parameters, like power transfer efficiency and loss factor have been shown. © 2015 IEEE.

Comprehensive mathematical modelling and experimental analysis of a wireless power transfer system for neighborhood electric vehicles

Internet of Things (IoT) can improve the lives of millions of people. In IoT the smart objects are converted from physical to virtual world to connect with Internet. The IoT enables smart objects to observe, identify, and understand the world without intervention of human-being (Machine-To-Machine communication: M2M). Due to the increasing interest of IoT, M2M, and wireless sensor applications the Wireless Local Area Network (WLAN) IEEE802.11 standard has taken interest to define a new standard 802.11ah which focuses mainly on IoT applications. The IEEE 802.11ah exploits 802.11 standard advantages and satisfies the IoT requirements by handling large number of devices and that also with reduced power consumption at node/object level. This standard is still in progress and is expected to be approved by 2016. In this paper we would evaluate the performance of IEEE802.11ah protocol through an analytical model using Markov chain model and then evaluate in MATLAB 2013a. © 2016 IEEE.

Proceedings - 2016 International Conference on Micro-Electronics and Telecommunication Engineering, ICMETE 2016

Performance evaluation of IEEE 802.11ah protocol in wireless local area network

Recent days, the demand for wireless power transfer (WPT) system is highly growing since it is more convenient, reliable and safer solution for electric vehicle (EV) consumers. Static and dynamic power transfer systems are the two opted appreciable wireless charging techniques for user friendly EVs. In static and dynamic charging systems, low power transfer efficiency (ηp) between transmitter and receiver coils is the principle challenge in existing issues of wireless charging system. The paper mainly focuses on improvement of power transfer efficiency in the system. The analyses presented in this paper are tested for distinct face to face distances of the coils to observe the effect of reluctance on power transfer efficiency. Here two kinds of coil structures have been adopted and are tested with various core configurations to find the suitable combination for the enhancement of power transfer efficiency. The paper presents a comparative analysis on performance characteristics of WPT system using inductive coupled and magnetic resonance coupled (MRC) power transfer techniques. In MRC system, various compensation topologies are used to find the efficient topology which enhances the better impedance matching in the system. Further, the analysis on effect of aluminum shielding is alsoreported. © 2016 IEEE.

India International Conference on Power Electronics, IICPE

A comparative analysis on WPT system using various power transfer methodologies and core configurations

Wireless power transfer (WPT) is one of the safe and convenient way of transmitting power for short range distances. But its efficiency is lower than wired power transfer due to low coupling coefficient and improper coupling between transmitter and receiver. In the field of inductively coupled wireless power transfer, identifying and enabling of appropriate reluctance path between the transmitter and receiver is a significant element. This can be achieved by selecting proper dimensions as well as the suitable category of the core. This paper demonstrates design aspects and the effects of core dimensions on the coupling factor and illustrates the different core combinations. It also provides numerical analysis of various factors such as leakage flux, mutual flux and coupling factor and the similar attributes for various WPT models. In this work, various core combinations have been analyzed to find an efficient combination to achieve highest coupling coefficient to facilitate maximum power transfer in the system. The WPT system is further analyzed under no-load as well as load conditions for various distances between transmitter and receiver. © 2015 IEEE.

Proceedings of the 2015 39th National Systems Conference, NSC 2015

Extensive analysis on wireless power transformer for various core configurations

Advancement in technology enhances the need for quick and efficient ways of charging electric devices. Increased need for portability has motivated us to make use of Wireless Power Transfer technology (WPT). In this paper, Magnetic Resonant Technique (MRT) based WPT system has been used to transfer the power wirelessly over larger airgaps. The conventional electric vehicles uses a battery as the main source and it suffers from large 1charging time and also it requires huge amount of space for the charging station. This paper illustrates various methods to implement WPT-MRT and supercapacitor based two-wheeler type electric vehicle (EV) to diminish the charging issues in the system. In this paper, 3-phase Permanent Magnet Brushless DC Motor (PMBLDC) is also used as a traction motor since it is energy efficient, has high torque per volume and greater ease of control compared to other motors. A TI controller is used as a central control unit to monitor the control variables of the system. This paper presents experimental interpretations of various compensation topologies and proves the supreme topology to achieve highest coupling coefficient to make maximum power transfer possible in the system. In this paper, the investigations and experimental study are further extended to provide a durable solution to facilitate fast / frequent charging for short commuting electric vehicles of the future. © 2016 IEEE.

2016 IEEE 6th International Conference on Power Systems, ICPS 2016

Investigations and experimental study on Magnetic Resonant coupling based Wireless Power Transfer system for neighborhood EV's

In today's fast paced life, getting a good and sound sleep has become very difficult resulting in increased cases of sleepwalk. Sleepwalking is much more dangerous than what it appears to be. Many incidents have been reported in which people have performed extremely dangerous activities during sleepwalking viz. suicide, murder, robbery or any other criminal action. This paper aims to develop a prototype for continuous monitoring and protection of sleepwalking patients. The prototype can detect when a person falls or trying to go out of doors, windows etc. unconsciously during sleepwalking. Accelerometer and motion sensor have been used for detecting fall and motion respectively. When an event happens, an alarm sounds and a message is sent on a registered mobile number which is already stored in the microcontroller and simultaneously a call is sent on another mobile number using wireless cellular system, thus alerting the concerned authorities to prevent any mishap. Wireless personal area network WPAN (IEEE802.15.4/ZigBee 2.4 GHz RF Modem) has been used for indoor wireless communication in the prototype. © 2015 IEEE.

Wireless health monitoring system for sleepwalking patients

This work explores the new ESD (electrostatic discharge) protection design methodology for high speed off-chip communication ICs (Integrated Circuits). We propose novel methodology which describes the optimized design prediction of ESD protection device under HBM (Human Body Model) stress condition. Furthermore, we have discussed the ESD-I/O circuit interaction and improved the ESD circuit robustness by varying the various layout parameters and minimizing the parasitic capacitance of the protection device. Here, GG-NMOS (Gate Grounded NMOS) is taken as an ESD protection device. Moreover, LVDS (Low Voltage Differential Signaling) driver circuit is used as test circuit, where we compared the impact of capacitance due to protection device on circuit performance. The second breakdown triggering current (It2) which can be considered a metric of ESD robustness, is dependent on the drain to gate contact spacing (DCGS). We show that spacing optimization effectively elevates It2 by increasing the ballasting behavior and uniformity in current distribution while causing only a marginal increment in parasitic capacitance. © 2016 IEEE.

World University root node

Proceedings of the IEEE International Conference on VLSI Design

A Novel Co-design Methodology for Optimizing ESD Protection Device Using Layout Level Approach

This paper models the indeterminacy that occurs during the formation of breakdown current channels in a bipolar structure, when subjected to an ultrafast high voltage pulse. The experimental results, pertaining to different regimes of the voltage ramp speed, applied across the bipolar structure are modeled. The avalanche injection mechanisms under variable high speed ramps are studied through the formation and propagation of ionizing waves, which lead to either weak or strong injection of mobile carriers, as the high current injection paths get coupled. Furthermore, the role of emitter injection is related to the indeterminacy associated with the snapback phenomenon and systematically related to the experimental observations. © 1963-2012 IEEE.

IEEE Transactions on Electron Devices

Modeling Erratic Behavior Due to High Current Filamentation in Bipolar Structures under Dynamic Avalanche Conditions

In this work two isomeric copolymers of benzodithiophene and BODIPY have been designed and synthesized. Structural isomeric polymers were designed such that one of the polymers exhibits more planar architecture, which would help in understanding the effect of structural isomerism and planarity in the polymer backbone on charge carrier mobility. Structural differences in of both these structures were also studied using DFT and TDDFT calculations. © 2016 IEEE.