High step up interleaved forward-flyback boost converter with three-winding coupled inductors

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IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
HIGH STEP-UP INTERLEAVED FORWARD-FLYBACK BOOST CONVERTER WITH
THREE-WINDING COUPLED INDUCTORS
By
A
PROJECT REPORT
Submitted to the Department of electronics & communication Engineering in the
FACULTY OF ENGINEERING & TECHNOLOGY
In partial fulfillment of the requirements for the award of the degree
Of
MASTER OF TECHNOLOGY
IN
ELECTRONICS & COMMUNICATION ENGINEERING
APRIL 2016

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CERTIFICATE
Certified that this project report titled “HIGH STEP-UP INTERLEAVED FORWARD-
FLYBACK BOOST CONVERTER WITH THREE-WINDING COUPLED
INDUCTORS” is the bonafide work of Mr. _____________Who carried out the research under
my supervision Certified further, that to the best of my knowledge the work reported herein does
not form part of any other project report or dissertation on the basis of which a degree or award
was conferred on an earlier occasion on this or any other candidate.
Signature of the Guide Signature of the H.O.D
Name Name

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DECLARATION
I hereby declare that the project work entitled “HIGH STEP-UP INTERLEAVED
FORWARD-FLYBACK BOOST CONVERTER WITH THREE-WINDING COUPLED
INDUCTORS” Submitted to BHARATHIDASAN UNIVERSITY in partial fulfillment of the
requirement for the award of the Degree of MASTER OF APPLIED ELECTRONICS is a record
of original work done by me the guidance of Prof.A.Vinayagam M.Sc., M.Phil., M.E., to the
best of my knowledge, the work reported here is not a part of any other thesis or work on the
basis of which a degree or award was conferred on an earlier occasion to me or any other
candidate.
(Student Name)
(Reg.No)
Place:
Date:

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ACKNOWLEDGEMENT
I am extremely glad to present my project “HIGH STEP-UP INTERLEAVED FORWARD-
FLYBACK BOOST CONVERTER WITH THREE-WINDING COUPLED
INDUCTORS” which is a part of my curriculum of third semester Master of Science in
Computer science. I take this opportunity to express my sincere gratitude to those who helped me
in bringing out this project work.
I would like to express my Director, Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.),
PGDCA., CGT., M.A.(Psy.) of who had given me an opportunity to undertake this project.
I am highly indebted to Co-Ordinator Prof. Muniappan Department of Physics and thank from
my deep heart for her valuable comments I received through my project.
I wish to express my deep sense of gratitude to my guide
Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for
successful completion of this project.
I also express my sincere thanks to the all the staff members of Computer science for their kind
advice.
And last, but not the least, I express my deep gratitude to my parents and friends for their
encouragement and support throughout the project.

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ABSTRACT:
A novel high step-up interleaved converter for highpower high-voltage applications is
proposed in this paper. Through three-winding coupled inductors, a high step-up conversion with
high efficiency is obtained. The proposed converter not only reduces the current stress, but also
constrains the input current ripple, which decreases the conduction losses and lengthens the life
time of input source. In addition, due to the lossless passive clamp performance, leakage energy
is recycled to the output terminal. Hence, large voltage spikes across the main switches are
alleviated and the efficiency is improved. Even, the low-voltage stresses on semiconductor
components are substantially lower than the output voltage. Finally, the prototype circuit with
input voltage 48 V, output voltage 380 V, and output power 2 kWis operated to verify its
performance. The highest efficiency is 96.5%, and the full-load efficiency is 92.6%.

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INTRODUCTION:
A novel high step-up interleaved converter for high power high-voltage applications is
proposed in this paper. Through three-winding coupled inductors, a high step-up conversion with
high efficiency is obtained. The proposed converter not only reduces the current stress, but also
constrains the input current ripple, which decreases the conduction losses and lengthens the life
time of input source.
In addition, due to the lossless passive clamp performance, leakage energy is recycled to
the output terminal. Hence, large voltage spikes across the main switches are alleviated and the
efficiency is improved. Even, the low-voltage stresses on semiconductor components are
substantially lower than the output voltage
The proposed boost/forward/flyback converter not only utilizes the switched capacitors,
but also integrates three-winding characteristicswell into coupled inductors, which achieves more
flexible step-up regulation and voltage stress adjustment. Thus, the proposed converter is suitable
as an excellent candidate for high step-up conversion with high power and high efficiency.
The three-winding coupled inductors can be designed to extend step-up gain and to adjust
voltage stresses. The advantages of the proposed converter are as follows: 1) the characteristics
of low-input current ripple and low conduction losses, increase life-time of renewable energy
sources and make it suitable for high-power applications; 2) the high step-up gain that renewable
energy systems require is easily obtained; 3) leakage energy is recycled to the output terminal,
hence, large voltage spikes across the main switches are alleviated and the efficiency is
improved; 4) the low voltage stresses on semiconductor components are substantially lower than
the output voltage.

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EXISTING SYSTEM:
Conventional step-up converters, such as the boost converter and flyback converter,
cannot achieve a high step-up conversion with high efficiency because of the resistances of
elements or leakage inductance; also, the voltage stresses are large. A boost converter (step-up
converter) is a DC-to-DC power converter with an output voltage greater than its input voltage. It
is a class of switched-mode power supply (SMPS) containing at least two semiconductors (a
diode and a transistor) and at least one energy storage element, a capacitor, inductor, or the two
in combination. Filters made of capacitors (sometimes in combination with inductors) are
normally added to the output of the converter to reduce output voltage ripple.

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PROPOSED SYSTEM:
The proposed boost/forward/flyback converter not only utilizes the switched capacitors,
but also integrates three-winding characteristics well into coupled inductors, which achieves
more flexible step-up regulation and voltage stress adjustment. Thus, the proposed converter is
suitable as an excellent candidate for high step-up conversion with high power and high
efficiency. The three-winding coupled inductors can be designed to extend step-up gain and to
adjust voltage stresses

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ADVANTAGES:
 The characteristics of low-input current ripple and low conduction losses, increase life-
time of renewable energy sources and make it suitable for high-power applications.
 The high step-up gain that renewable energy systems require is easily obtained.
 Leakage energy is recycled to the output terminal, hence, large voltage spikes across the
main switches are alleviated and the efficiency is improved.
 The low voltage stresses on semiconductor components are substantially lower than the
output voltage.

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BLOCK DIAGRAM:

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TOOLS AND SOFTWARE USED:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation

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APPLICATIONS:
 Fuel cells.
 Photovoltaic cells.

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CONCLUSION:
A 2-kW prototype of the proposed high step-up converter is tested. The electrical
specifications is shown in Table I. The design consideration of the proposed converter includes
components selection and coupled inductors design, which are based on the analysis presented in
the previous chapter. In the proposed converter, the values of the primary leakage inductors of
the coupled inductors are set as close as possible for current sharing performance. Due to the
performances of high step-up gain, the turns ratios can be set as 1 for the prototype circuit to
reduce cost, volume, and conduction loss of windings. Thus, the copper resistances which affect
efficiency much can be decreased.

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REFERENCES:
[1] J. T. Bialasiewicz, “Renewable energy systems with photovoltaic power generators:
Operation and modeling,” IEEE Trans. Ind. Electron., vol. 55, no. 7, pp. 2752–2758, Jul. 2008.
[2] T.Kefalas andA.Kladas, “Analysis of transformersworking under heavily saturated conditions
in grid-connected renewable energy systems,” IEEE Trans. Ind. Electron., vol. 59, no. 5, pp.
2342–2350, May. 2012.
[3] Y. Xiong, X. Cheng, Z. J. Shen, C. Mi, H.Wu, and V. K. Garg, “Prognostic and warning
system for power-electronic modules in electric, hybrid electric, and fuel-cell vehicles,” IEEE
Trans. Ind. Electron., vol. 55, no. 6, pp. 2268–2276, Jun. 2008.
[4] A. K. Rathore, A. K. S. Bhat, and R. Oruganti, “Analysis, design and experimental results of
wide range ZVS active-clamped L-L type currentfed dc/dc converter for fuel cells to utility
interface,” IEEE Trans. Ind. Electron., vol. 59, no. 1, pp. 473–485, Jan. 2012

High step up interleaved forward-flyback boost converter with three-winding coupled inductors

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High step up interleaved forward-flyback boost converter with three-winding coupled inductors