Project Abstract

Project title: Wireless charger using two n channel MOSFETS IRF 540,4148 diodes
Student’s Name with USN Bharat Kumar
1JB16EE005
SJBIT

Academic Supervisor REKHA P S

SYNOPSIS
ABSTRACT:

Wireless charging is a technology of transmitting power through an air gap to electrical devices

for the purpose of energy replenishment. The recent progress in wireless charging techniques and

development of commercial products have provided a promising alternative way to address the

energy bottleneck of conventionally portable battery-powered devices. However, the

incorporation of wireless charging into the existing wireless communication systems also brings

along a series of challenging issues with regard to implementation, scheduling, and power

management. In this paper, we present a comprehensive overview of wireless charging

techniques, the developments in technical standards, and their recent advances in network

applications.

INTRODUCTION:
Emerging technologies are making our life simpler these days. With the introduction of

mobile phones, life has changed rapidly. This is a dream of radio engineering. Mobile

phones merged land line telephone systems. These days, many advancements in the

mobile phones were introduced.

These advancements provide many services such as text, internet etc. But although there

Dept of EEE, SJBIT Page 1

are many advancements in the technology, we still rely on the wired battery chargers. Each

phone will have its own designed battery charger. Thus the battery chargers are required to

carry everywhere to keep the battery backup. When you sit for tea and place your mobile on the

table,it simply charges your mobile. This article explains a simple wireless battery charger circuit

that charges your mobile when placed near the transmitter. This circuit may be used as wireless

power transfer circuit, wireless mobile charger circuit, wireless battery charger

circuit, etc.

Wireless Battery Charger Circuit Principle:

transmitter to the receiver wirelessly based on the principle of •ginductive coupling•h.

Inductance is the property of the conductor, in which the current flowing in a conductor

induces a voltage or electromotive force in it or in another nearby conductor. There are two

types inductance. 1) Self inductance, 2)Mutual Inductance.

Dept of EEE, SJBIT Page 2

Wireless Power Transfer Circuit Diagram:

Wireless battery charger circuit design is very simple and easy. These circuits require only

resistors, capacitors, diodes, Voltage regulator, copper coils and Transformer.

In our Wireless battery charger, we use two circuits. The first circuit is transmitter circuit

used to produce voltage wirelessly. The transmitter circuit consists of DC source, oscillator

circuit and a transmitter coil. oscillator circuit consists of two n channel MOSFETS IRF 540

, 4148 diodes. When the DC power is given to the oscillator, current starts flowing through

the two coils L1, L2 and drain terminal of the transistor. At the same time some voltage is

appeared at the gate terminals of the transistors.

Dept of EEE, SJBIT Page 3

In the second circuit that is receiver circuit consists of receiver coil, rectifier circuit and

regulator.

WORKING:

Broadly speaking, there are three types of wireless charging, according to David Green, a

research manager with IHS Markit. There are charging pads that use tightly-coupled

electromagnetic inductive or non-radiative charging; charging bowls or through-surface type

chargers that use loosely-coupled or radiative electromagnetic resonant charging that can

transmit a charge a few centimeters; and uncoupled radio frequency (RF) wireless charging that

allows a trickle charging capability at distances of many feet.

Both tightly coupled inductive and loosely-coupled resonant charging operate on the same

principle of physics: a time-varying magnetic field induces a current in a closed loop of wire.

It works like this: A magnetic loop antenna (copper coil) is used to create an oscillating magnetic

field, which can create a current in one or more receiver antennas. If the appropriate capacitance

is added so that the loops resonate at the same frequency, the amount of induced current in the

receivers increases.

REFERENCES:
1). R. Lomas, The Man Who Invented the Twentieth Century: Nikola Tesla Forgotten Genius of

Electricity, USA, CA, Los Angeles:CreateSpace Independent Publishing Platform, pp. 146,

1999.

2). J. C. Schuder, H. E. Stephenson, I. F. Townsend, "High-level electromagnetic energy transfer

through a closed chest wall", Proc. IRE Int. Conf. Record, vol. 9, pp. 119-126, 1961.

Dept of EEE, SJBIT Page 4

Dept of EEE, SJBIT Page 5

Dept of EEE, SJBIT Page 6

Dept of EEE, SJBIT Page 7

Dept of EEE, SJBIT Page 8