International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IV, April 2018 | ISSN 2321–2705
Wireless Power Transfer at Domestic Level Using an
Induction Stove
Rekha Chander1, Sneha Pattanaik2, C.Cauveri3, S.Senthilmurugan4
1, 2, 3, 4
SRM Institute of Science and Technology, Chennai, Tamil Nadu, India
Abstract— The usage of domestic induction cookers has
metamorphosed from fixed cooking areas to novel engineering
concepts like wireless power transfer. This implies the use of an
induction stove and coils to charge a device wirelessly. This can be
put into effect both statically and dynamically. In this paper, we
will probe into its usage for static transfer of power wirelessly.
The prototype here consists of 2 inductor coils placed in contact
with each other, such that one remains connected to the stove and
the other coil connected to a variable load. Upon providing a
supply voltage of 220V, a led hovered above the arrangement gets
illuminated. The aim of this work is to evaluate this concept
applied to domestic induction heating appliances, with special
emphasis in analyzing the effects of introducing the multi-coil
system with dissipative media.
overlapped induction coils can be used for wireless power
transfer. The transmitter and receiver coils conjointly form an
arrangement identical to that of a transformer.
When an alternating current (AC) is passed through the
transmitter coil (L1), it generates an oscillating magnetic field
(B) by Ampere's law. This magnetic field so created passes
through the receiving coil (L2), where it induces an alternating
EMF (voltage) by Faraday's law of induction, which creates an
alternating current in the receiver.
The table below implies the various methods available for
wireless power transfer.
TABLE I
Methods of WPT
Index Terms— Coil, Field, Inductive heating, Wireless power
transfer
I. INTRODUCTION
D
OMESTIC induction heating appliances base their
operation on steamrolling an alternating current in the
range of tens of kilohertz into flowing through an
inductor. The basic principle of operation here is Faraday's law.
An induction burner or stove consists of a ceramic plate with
an electromagnetic coil beneath it. When the stove is switched
on, an electric current runs through the coil, stirring up a
fluctuating magnetic field, with no heat on the burner itself.
However, once an iron or stainless-steel pan is placed on the
burner, the magnetic field induces many smaller electric
currents in the pan’s metal.
Technology
Inductive coupling
Resonant inductive
coupling
Capacitive coupling
Energy transfer
Magnetic fields
Magnetic fields
Electric fields
Magneto dynamic
coupling
Magnetic fields
Microwave radiation
Microwaves
Optical radiation
Light/infrared/ultraviolet
Enabling the
power transfer
Coils of wire
Resonant
circuits
Conductive
coupling plates
Rotating
permanent
magnets
Phased
arrays/dishes
Lasers
/photocells
Iron is a poor conductor of electricity, so as all these small
currents run through the iron, much of the energy is converted
to heat. So, on an induction cooktop, the heat isn't enkindled
from the burner, but the pan itself.
Induction heating, in the past decade has largely replaced the
traditional heating methods like gas burners or resistive heating
due to a wide variety of reasons, the main being its speed and
ease of operation.
In recent years, the concept of wireless power transfer has
also witnessed a boom, with almost every field trying to vie it.
In this paper, we aim at establishing a connection between
these two imminent fields.
II. WIRELESS POWER TRANSFER
In this paper, we employ the method of inductive power
transfer. In inductive power transfer, (IPT), power is
transferred between coils of wire by a magnetic field. Two
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Fig 1. Inductive power transfer
The induced alternating current may either drive the load
directly, or be rectified to direct current (DC) by a rectifier in
the receiver, which drives the load. An electronic oscillator
produces an AC current of frequency with greater magnitude
which drives the coil, because transmission efficiency revamps
with frequency. The power transmitted upsurges with
frequency and the mutual inductance M between the coils,
which is governed by their geometry and the distance between
them. An extensively used figure of merit is the coupling
coefficient K. This dimensionless parameter is equivalent to
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International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IV, April 2018 | ISSN 2321–2705
the fraction of magnetic flux through the transmitter coil L1
that passes through the receiver coil L2 when L2 is open
circuited. If the two coils are on the same axis and close to each
other such that all the magnetic flux from L1 disseminates
through L2, then k=1 and the link efficiency advances towards
100%. The more the separation between the coils, a larger
value of the magnetic field from the first coil veers from the
second, and the lower k and the link efficiency are, looming
towards zero at large separations. The link efficiency and
power transferred is roughly proportional to K2 , which is the
square of coupling coefficient.
FIGURE 3. Coil of Induction Stove
III. EXPERIMENTAL SETUP
The prototype that we used in our experiment is an induction
stove with a voltage rating of 230V and a power rating of
1600W. It operates under normal frequency of 50 Hz. Apart
from the induction stove, the arrangement also consists of an
external coil, similar to the one present inside the induction
stove and a variable resistance (rheostat) which acts as the load.
We also use an LED to witness the transfer of power wirelessly
and the voltage and current are measured using a voltmeter
(0-300V range) and an ammeter (0-10A range) respectively.
Switch on supply of 230V, 50Hz
The induction stove gets turned on.
FIGURE 4. External coil
Vary the rheostat to the required
resistance value.
Move the LED above the
arrangement.
The LED lights up.
Note the ammeter readings
Note the voltmeter readings
Figure 2. Flowchart
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FIGURE 5. Internal structure of an induction stove
The external coil is made to overlap the coil present inside the
induction stove. The ends of this coil are then connected to
appropriate terminals of the rheostat. The ammeter is then
connected in series across the load and the voltmeter is
connected in parallel across the load. The supply which is
provided to the arrangement is normal AC supply – 230V,
50Hz.
When the supply is switched on, the LED is held over the
setup. The LED lights up, due to wireless transfer of power.
The measured value of voltage as shown by the voltmeter is
229V and the current value displayed by the ammeter varies for
different values of the load. We measured it for a resistance
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International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IV, April 2018 | ISSN 2321–2705
value of 140.9 ohms and the current was measured to be
1.625A.
IV. EXPERIMENTAL RESULTS
From obtained results in table we can see that 2.25 is the
maximum current that can be obtained. If we increase the load
further lots of energy is dissipated in the form of heat (heat
losses). As we can see from the below table the voltage remains
constant and current keeps on increasing gradually increasing
the load (the load here is a variable rheostat). The experimental
results agree with theoretical results.
TABLE II
SNO.
VOLTAGE
(V)
CURRENT
(A)
1
220
1.625
2
223
1.75
3
225
2
4
228
2.125
5
229
2.25
disadvantages, caused by the dissipation of energy in the form
of heat. Energy is wasted in this way and the load is also
overheated. This will make the system less efficient. However,
the study proves the viability of overlapped coils for induction
heating and wireless power transfer applications and throws
promising results, opening a novel developing area in domestic
induction heating appliances. .
ACKNOWLEDGMENT
We would like to thank our professor Mr. Senthil Murugan
for his invaluable aid and guidance all throughout our work.
We also extend our gratitude to the EEE department of SRM
institute of science and technology for constant support in
helping us formulate this paper.
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V. OBSERVED GRAPH
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CURRENT
Voltage vs Current
2.5
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1.5
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0.5
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220
223
225
228
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VI. CONCLUSION
In the proposed model, overlapped inductors technique which
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of domestic IH. Here for the wireless transmission of power we
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