Paper on Implementation Of MPPT Charge Controller Based Buck-Boost Converter

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 04 Issue: 3 | Mar -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 545
Paper on Implementation Of MPPT Charge Controller Based Buck-
Boost Converter
Vikas R.Gurav1, Sunil S.patil2, Akshay S.Salokhe3, Mr.P.V.Kothawale4
123Department of E&TC,SGI Kolhapur,Maharashtra,India
4Assistant Professor,Department of E&TC,SGI Kolhapur,Maharashtra,India
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Abstract— In this project, design of MPPT charge
Controller shows as a buck-boost converter. This buck-
boost converter is to maintain the constant output
voltage as well as abstracts the more additional
available power from the photovoltaic module. This
system is based on constant voltage trcking method.
This system consist of buck-boost converter which is
based on TL494 IC.TL494 is fixed frequency, pulse
width modulation control circuit. Also it includes ACS
712 current sensor, LCD display, microcontroller,
MOSFET circuit, coil burner as a load.
Key Words- Photovoltaic module, buck-boost
converter method, Burner coil(load),current sensor,
Ferrite core transformer.
INTRODUCTION
Now a day’s, most of works are depends on
electricity. so, demand of electricity is increased by
day to day.But cost of generating power is more. So,
for that problem, we find out the solution.We have a
solar energy.It is pollution free and sustainable
energy.By using this solar energy we have
implemented the MPPT charge controller technique.
MPPT is a maximum power point tracking charge
controller to track the operating point and keep the
maximum power point at highest efficicency. PV
module is to deliver the available power. MPPT
harvested more power from PV module and store
into battery.
So,battery charge current will increased and
then the system efficiency also improved.By
generating the electricity using this technique is
more helpful to reduce the power generating cost.
From many researches on generation of
electricity,we fount that MPPT technique is most
efficient and economical to generate electricity. The
Microcontroller is used only for displaying the
voltage, current and power. A charge controller is
used to regulates the charge to battery and avoiding
overcharging.
BUCK CONVERTER
It is a DC-DC power converter which steps
down the voltage or step up the current from its
input to output. Also it is converter which DC input
Voltage is greater than DC output voltage.
Fig. Buck converter circuit
The buck converter is a form of DC-DC
converter that can take an input from DC source as a
battery and also it could be DC derived from main AC
supply through the rectifier capacitor circuit[1]. The
AC input supply is gives to the rectifier circuit or it
can be alternate the voltage by step-down
transformer. so, the DC voltage is applied to the buck
converter circuit.
Then, this DC voltage is converter into AC
voltage by chopper or switching transistor. Again it
will be reconverted into original DC voltage. Always,

it maintain the constant the output voltage if input
supply is does not get the properly and if the input
supply is maximum vary.
In winter,time of sunrays are very low.But
we need the more power to charge the battery.So,at
that time,boost converter is widely used to extracts
maximum power and charge the battery.
BOOST CONVERTER
It is a step up converter which steps up voltage
or step down current from its supply to load. This
converter which DC input voltage is less than the DC
output voltage. These converters provides the
maximum power efficiency. It step up the input
voltage to the required output voltage. An Inductor, a
Diode and a high frequency switch is the main part of
boost converter[2].
Fig. Boost converter circuit
When the switch is ON,the inductor output is
connected to ground and voltage Vin across it.so, the
inductor current increases at Vin/L[5] . When the
switch ids OFF,voltage across the inductor is
changed.so,the output voltage equal to inpu
voltage.The boost converter is harvested the
Maximum current from the photovoltaic module. In
summer,time of sunrays are more.So,more sunrays
are followed on the PV module and maximum power
stored into the battery.If we used buck converter,it
maintain the constant output and prevent
overcharge the battery.
VOLTAGE CONSTANT METHOD
In this project,we can implement the MPPT
charge controller using the voltage constant
method.Constant voltage is term is defined as the
output voltage is regulated to a constant value under
various conditions ans also it is based on a constant
ratio to the measured open circuit voltage[3]. A
constant voltage maximum power point that
automatically adjust the reference voltage to account
for varying environmental conditionis present.
The constant voltage MPPT is the simplest
method.The operating point of the photovoltaic
module is near the maximum power point by
regulating the solar output voltage to match an
unmovable reference voltage[4].The reference voltage
is set equal to voltage at maximum power point of
characteristic photovoltaic module.From observ
that,the constant voltage technique is more effective
than other techniques which are used for MPPT.
BLOCK DIAGRAM
WORKING OF SYSTEM
In our project we use a voltage tracking
based system, in which we track the input for
optimising maximum power point. We have used IC
TL494 for that purposes. The TL494 IC is a fixed
frequency variable duty cycle IC, it is operated as DC-
DC converter & Tracker.
The TL494 has two in built comparator, we
have use one comparator for to maintain output
voltage constant whereas another for input voltage
tracking purposes. We take overall day analysis on
100W solar panel for checking the operating voltage
where achieves a maximum power point, we find

that 13.5 to 14.5 panel voltage achieves maximum
power. So if we track this i/p voltage then obtain
maximum power every time.This is done by we use
TL494 for that purpose, one comparator of TL494 IC
compares the input voltage with ref value (set Value
i.e. 13.5) i/p voltage lock to this value by adjusting
duty cycle (it has inbuilt function). TL494 operates
on the frequency of 22Khz by choosing CT & RT value
and we use this IC in push pull mode, using centre
tapped ferrite core transformer, we have use push
pull amplifier based on IRF3205 MOSFETs which will
derived through BC547 & BC557 transistor. The
output of ferrite core transformer is rectified through
a schotky diode and filtered through LC type filter to
get pure dc output voltage.
DESCRIPTION
1.This project is divided into two parts. one is the
without MPPT and another is with MPPT.
2.In without MPPT, we can directly connected PV
module to load and measure the voltage and current
by voltmeter and multimeter. Then, calculate the
power.
3.In with MPPT, buck-boost converter circuit is
connected between the PV module and load. Then,
see the power on the lcd display.
4.Now, we have two power readings from two parts.
So, we calculate the difference between the two
powers in percentage.
5.So, this percentage is called as efficiency and then
check the how many efficiency is increased.
6.From this project, we can show the increased
efficiency using the MPPT charge controller than
without MPPT used.
ACTUAL IMPLEMENTATION
Fig:-Implementation of MPPT Charge
Controller
Fig. Experimental Set-up
CONCLUSION
In this project, we have implemented MPPT
charge controller system based on buck-boost
converter is very efficient to increase the efficiency of
solar system and provide the maximum power to
load. This system is helpful to reduce the cost of
generating power than other techniques of
generating power. From this technique.we can
increase 25-30% efficiency. Here we
implement less system complexity. That means, if we
used voltmeter and ammeter to measure the voltage
and current. Then, some mistakes are occurred at
taking readings. power does not get accurate. so, we

used to lcd display to show directly voltage, current
and power. Thats why, we get the accurate power
when the buck-boost converter circuit is connected.
But in without MPPT we have to used voltmeter and
multimeter to measure voltage and current for
calculate power.
Acknowledgment
I would like to thank my project guide Prof. P.
V.Kothawale for giving us guidance and help for the
project.I am pleased to them for their support.
I am also thankful to Dr. S. R. Chougule.
HOD,SGI college of Engineering for her support and
opinion.
REFERENCES
1. WWW.learnaboutelectronics.org/PSU/psu31.
php
2. ‘’ADVANCED ALGORITHM FOR MPPT
CONTROL OF PHOTOVOLTAIC SYSTEM’’
Conference system Theory ,2011 IEEE.
3. a.b.”Design and simulation of an open voltage
algorithm based maximum power point
tracker for battery charging PV
system”.IEEE.org.
4. Referred paper of 2014 IEEE Global
Conference on Wireless Computing and
Networking Hardware Implementation of
DC-DC Converter for MPPT in PV Application
5. Referred journal of Power and Energy
Engineering,2014

Paper on Implementation Of MPPT Charge Controller Based Buck-Boost Converter

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Paper on Implementation Of MPPT Charge Controller Based Buck-Boost Converter