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wireless power transmission using mutual induction pdf

Abstract

We cannot imagine the world without electric power. Generally the power is transmitted through wires. This paper describes an original idea to eradicate the hazardous usage of electrical wires which involve lot of confusion in particularly organizing them. Imagine a future in which wireless power transfer is feasible: cell phones, household robots, mp3 players, laptop computers and other portable electronics capable of charging themselves without ever being plugged in, freeing us from that final, ubiquitous power wire. Some of these devices might not even need their bulky batteries to operate. This paper includes the techniques of transmitting power without using wires with an efficiency of about 95% with non radiative methods. Due to which it does not affect the environment surrounding. These techniques Includes resonating inductive coupling in sustainable moderate range. The coupling consists of an inductor along with a capacitor with its own resonating frequency. In any system of coupled resonators there often exists a so-called “strongly coupled” regime of operation. If one ensures to operate in that regime in a given system, the energy transfer can be very efficient. Another technique includes transfer of power through microwaves using rectenna. This is particularly suitable for long range distances ranging kilometers.
With this we can avoid the confusion and danger of having long, hazardous and tangled wiring. This paper as a whole gives an
effective, high performance techniques which can efficiently transmit the power to the required area vary in given distances for the power transmission through induction.

Introduction

Recent renewed interest in commercial development of wireless power transfer through magnetically-coupled resonant circuits has shown the need for a computational tool that can calculate the mutual inductance of coils of arbitrary geometry and spatial orientation. This task is often performed by finite-element analysis (FEA), but this requires both access to such software and a degree of expertise on the part of the designer. This paper introduces a simple-to-use Matlab-based computational tool for calculating mutual inductance for inductors in free space based upon magnetic vector potential.Factors that affect transmission efficiency of resonance based wireless power transmission (WPT) is discussed in this paper. Two topologies of input circuit of WTP system are analyzed; Comparison of the two topologies is given on capability of output exiting current for resonance coils with angular frequency changing from 0 to 20 MHz. Mutual induction between resonance coils is given in mathematical expression which shows that the mutual induction of resonance coils is changing with modulus value of coils and the angular frequency of the system. One way of impedance matching by changing inductive coupling coefficients between exiting coil and resonance coil is introduced. Experiment of WPT is introduced and the experiment results match well with the calculating result, the system performs well in delivering power using magnetic resonance coupling which shows that methods provided in this paper have practical guiding on building four coils WPT system.Factors that affect transmission efficiency of resonance based wireless power transmission (WPT) is discussed in this paper. Two topologies of input circuit of WTP system are analyzed; Comparison of the two topologies is given on capability of output exiting current for resonance coils with angular frequency changing from 0 to 20 MHz. Mutual induction between resonance coils is given in mathematical expression which shows that the mutual induction of resonance coils is changing with modulus value of coils and the angular frequency of the system. One way of impedance matching by changing inductive coupling coefficients between exiting coil and resonance coil is introduced. Experiment of WPT is introduced and the experiment results match well with the calculating result, the system performs well in delivering power using magnetic resonance coupling which shows that methods provided in this paper have practical guiding on building four coils WPT system.