Phaneendra Babu Bobba

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

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.

Design and analysis of a robust system for wirelessly powering implantable devices

Wireless transfer of power is an ever growing field of technology which has a wide array of applications ranging from charging of electric vehicles (EVs) to small devices such as medical implants. This can be implemented through highly resonant near field coupling of electromagnetic resonators. This work primarily focuses on the development of a wireless power transformer for implanted medical devices having low power requirement such as implantable pulse generators and pacemakers. This is accomplished by designing and implementing a four coil system consisting of a high efficiency wireless power transformer that can transfer sufficient energy to charge small devices from a reasonable distance up to 25 mm. Wireless charging can provide a safer and hassle free alternative to the conventional wired biomedical devices.

Realization of complete permanent magnet brushless DC motor drive for electric two-wheelers

PMBLDC motors are extensively used in industrial and household applications with an emphasis on Electric vehicles due to their significant advantages over conventional AC machines. The paper aims at design, simulation and hardware realization of complete PMBLDC Drive for Electric Vehicle applications. The drive system is modelled and simulated in Simulink Environment. As a part of hardware implementation, three phase inverter and its gate driver, current and voltage sensors and hall sensor interfacing circuit have been designed and implemented. TI controller Delfino F28335 facilitates the manual speed control of the drive system. The motor operated in motoring modeby considering driver input as acceleration signal. The experimental and simulation results are presented and compared.

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

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.

Effects of coil misalignment in a four coil implantable wireless power transfer system

Wireless power transfer (WPT) is the technology which enables transfer of electric power without wires. It is based on the principle of electromagnetic induction. There are two main modes of WPT, inductive and resonance based coupling. In either of these methods, for the highest possible efficiency to be achieved, the transmitter and receiver coil should be aligned perfectly with each other, but in real world WPT applications, there is always some amount of misalignment between the transmitting and receiving coils. Therefore, it is important to study the effects of coil misalignment to identify and make the necessary design changes to maintain the efficiency of power transfer. This paper presents a simulation analysis on the effect of coil misalignments in a resonance coupled four coil WPT system and the effects of lateral misalignment have also been analyzed and documented.

Effect of coil geometry and shielding on wireless power transfer system

Magnetic resonance coupling (MRC) based wireless power transfer (WPT) system is recognized as an efficient and promising technology for safe, convenient and elegant charging solution for various electronic portable devices. MRC technology helps in transferring power wirelessly from transmitter to receiver over larger distances. However in such loosely coupled systems, low power transfer efficiency is the major issue in comparison to conventional wired charging systems. The paper presents detailed analysis of power transfer efficiency between two independent coils separated by distance of 15 cm. The analysis involves an effect of coil geometrical dimensions on power transfer efficiency and mutual inductance between transmitter (TX) and receiver coils (RX). In addition, the investigations are further extended to analyze the role of shielding and effect of shielding geometry on power transfer efficiency and mutual inductance between the two coils.

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

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.

Extensive analysis on wireless power transformer for various 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.