Hybrid phase shift-controlled three-level and llc dc–dc converter with active connection at the secondary side

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HYBRID PHASE-SHIFT-CONTROLLED THREE-LEVEL AND LLC DC–DC
CONVERTER WITH ACTIVE CONNECTION AT THE SECONDARY SIDE
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 “HYBRID PHASE-SHIFT-CONTROLLED THREE-
LEVEL AND LLC DC–DC CONVERTER WITH ACTIVE CONNECTION AT THE
SECONDARY SIDE” 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 “HYBRID PHASE-SHIFT-CONTROLLED
THREE-LEVEL AND LLC DC–DC CONVERTER WITH ACTIVE CONNECTION AT
THE SECONDARY SIDE” 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 “HYBRID PHASE-SHIFT-CONTROLLED
THREE-LEVEL AND LLC DC–DC CONVERTER WITH ACTIVE CONNECTION AT
THE SECONDARY SIDE” 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:
This paper proposes a hybrid phase-shift-controlled three-level (TL) and LLC dc–dc
converter. The TL dc–dc converter and LLC dc–dc converter have their own transformers.
Compared with conventional half-bridge TL dc–dc converters, the proposed one has no
additional switch at the primary side of the transformer, where the TL converter shares the
lagging switches with the LLC converter. At the secondary side of the transformers, the TL and
LLC converters are connected by an active switch. With the aid of the LLC converter, the zero
voltage switching (ZVS) of the lagging switches can be achieved easily even under light load
conditions. Wide ZVS range for all the switches can be ensured. Both the circulating current at
the primary side and the output filter inductance are reduced. Furthermore, the efficiency of the
converter is improved dramatically. The features of the proposed converter are analyzed, and the
design guidelines are given in the paper. Finally, the performance of the converter is verified by
a 1-kW experimental prototype.

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INTRODUCTION:
This paper proposes a hybrid phase-shift-controlled three-level (TL) and LLC dc–dc
converter. The TL dc–dc converter and LLC dc–dc converter have their own transformers.
Compared with conventional half-bridge TL dc–dc converters, the proposed one has no
additional switch at the primary side of the transformer, where the TL converter shares the
lagging switches with the LLC converter. At the secondary side of the transformers, the TL and
LLC converters are connected by an active switch.
With the aid of the LLC converter, the zero voltage switching (ZVS) of the lagging
switches can be achieved easily even under light load conditions. Wide ZVS range for all the
switches can be ensured. Both the circulating current at the primary side and the output filter
inductance are reduced.

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EXISTING SYSTEM:
A high-frequency DC-DC power converter for high-voltage and high power is
introduced, which features zero voltage-switching, switching at constant frequency, regulation
by pulse-width-modulation, and low RMS current stress upon power switches. Its greatest
attribute, in comparison to the ZVS-PWM-full bridge converter is that the voltage across the
switches is the half of the input voltage. This property is achieved due to the employment of the
three level leg.

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PROPOSED SYSTEM:
In this paper, a hybrid TL and LLC dc–dc converter is proposed with simple phase-shift
control. The TL converter and LLC converter have their individual transformers. At the primary
side of the transformers, the TL converter shares the lagging switches with the LLC converter. At
the secondary side, the TL and LLC converters are connected by an active switch to minimize the
conduction loss. The ZVS of the leading switches is similar to conventional HB TL dc–dc
converters, while the ZVS of the lagging switches is determined by the LLC converter.
Therefore, wide ZVS range can be achieved. Furthermore, the primary-side circulating current
can be reduced, so the conversion efficiency can be improved.

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ADVANTAGES:
 Higher efficiency.
 Minimize the conduction loss

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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:
 Industrial applications.

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CONCLUSION:
In this paper, a hybrid TL and LLC converter by sharing the lagging switches is proposed
for higher efficiency. Since the switches only withstand half of the input voltage, the proposed
converter is suitable for high input voltage applications. The LLC circuit can extend the ZVS
range of the lagging switches. The output current ripple and circulating current of the primary
side are reduced. Connecting the hybrid TL output and LLC by the proposed active switch based
on the proposed switching sequence can significantly increase the conversion efficiency further
during the wide load range. The good performance of the proposed converter and design method
has been verified by a 1-kW experimental prototype.

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REFERENCES:
[1] X. Ruan, B. Li, Q. Chen, S. Tan, and C. Tse, “Fundamental considerations of three-level dc–
dc converters: Topologies, analyses, and control,” IEEE Trans. Circuits Syst. I, Reg. Papers, vol.
55, no. 11, pp. 3733–3743, Dec. 2008.
[2] J. R. Pinheiro and I. Barbi, “The three-level ZVS-PWM dc-to-dc converter,” IEEE Trans.
Power Electron., vol. 8, no. 4, pp. 486–492, Jul. 1993.
[3] E. Deschamps and I. Barbi, “A comparison among three-level ZVS-PWM isolated dc-to-dc
converters,” in Proc. IEEE 24th Annu. Conf. Ind. Electron. Soc., 1998, pp. 1024–1029.
[4] J. R. Pinheiro and I. Barbi, “Wide load range three-level ZVS-PWM dcto- dc converter,” in
Proc. IEEE 24th Annu. IEEE Power Electron. Spec. Conf., 1993, pp. 171–177.
[5] X. Ruan, D. Xu, L. Zhou, B. Li, and Q. Chen, “Zero-voltage-switching PWM three-level
converter with two clamping diodes,” IEEE Trans. Ind. Electron., vol. 49, no. 4, pp. 790–799,
Aug. 2002.

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Hybrid phase shift-controlled three-level and llc dc–dc converter with active connection at the secondary side

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Hybrid phase shift-controlled three-level and llc dc–dc converter with active connection at the secondary side