Single inductor dual buck full bridge inverter

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IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
SINGLE INDUCTOR DUAL BUCK FULL-BRIDGE INVERTER
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 “SINGLE INDUCTOR DUAL BUCK FULL-BRIDGE
INVERTER” 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 “SINGLE INDUCTOR DUAL BUCK FULL-
BRIDGE INVERTER” 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:
ACKNOWLEDGEMENT

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I am extremely glad to present my project “SINGLE INDUCTOR DUAL BUCK FULL-
BRIDGE INVERTER” 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 new single inductor dual buck full-bridge inverter is proposed in this paper. The
inverter is improved on the basis of a dual buck inverter, and it retains theadvantage of a no
reverse recovery of body diode. The dc voltage utilization rate can be increased by adopting the
voltage commutation bridge instead of the voltage-dividing capacitors in the inverter. In
addition, comparing with other dual buck inverters, the inverter has just one filter inductor,
which can make the volume and weight of the system decreased observably and improve the
integration. The controlling method, combining the high- and low-frequency modulation, is
adopted to weaken the complexity of control and improve the reliability and stability of the
system. The operating principle, characteristic analysis, simulation and experiment are provided
in this paper. A 1-kW prototype is established and tested, and the results of simulation and
experiment verify the correctness of the theoretical analysis.

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INTRODUCTION:
The shoot-through problem is a major killer of the reliability. It needs to set dead time to
avoid the problem, but the dead-time effect will cause the distortion of output. During the dead
time, the inductor current flows through the body diode, which has long reverse recovery time
and great loss.
Therefore, except for the bridge-type inverter, the dual-buck type inverter is proposed
along with lots of research and development in recent years. The basic unit of dual-buck-type
inverter is unidirectional buck circuit;
thus, there is no shoot-through problem in the inverter and the freewheeling current
flows through the independent diodes instead of body diodes of the switches, which is conducive
to reducing the reverse recovery loss, increasing the switching frequency and using the super-
junction power metal–oxide–v-semi-conductor field-effect transistor with low on-resistance. In
addition, it is easy to have the series and parallel combinations for the inverter and construct a
three-phase system.
Therefore, except for the bridge-type inverter, the dual-bucktype inverter is proposed
along with lots of research and development in recent years. The basic unit of dual-buck-type
inverter is unidirectional buck circuit; thus, there is no shootthrough problem in the inverter and
the freewheeling current flows through the independent diodes instead of body diodes of the
switches, which is conducive to reducing the reverse recovery loss, increasing the switching
frequency and using the super-junction power metal–oxide–vsemiconductor fieldeffect transistor
with low on-resistance.

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In addition, it is easy to have the series and parallel combinations for the inverter and
construct a three-phase system. The rudiment of a dual buck inverter was proposed used it for the
high-frequency power amplifier treated this circuit as the CII inverter, which was used to the
threephase system to get the interleaved ripple current of two buck bridge legs.

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EXISTING SYSTEM:
The DBHBI without circulation current was introduced, which contributed to realizing
high reliability, high frequency, and high efficiency. The half-bridge input mode, which leads to
a low input-voltage utilization rate and high voltage stress

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PROPOSED SYSTEM:
This paper proposed a new single inductor dual buck full-bridge inverter, which works
without circulation current and adopts sinusoidal pulse width modulation (SPWM) control
method. The schematic of SIDBFBI proposed, which consists of voltage commutation bridge
and bidirectional current-mode high-frequency chopper circuit. The voltage commutation bridge
works at low frequency, just changing the polarity of the input voltage Ui, and the output voltage
uA is power-frequency square wave. Then, the bidirectional current mode high-frequency
chopper circuit with no shoot-through problem carries out the high-frequency chopping for uA,
outputting single polar high-frequency modulation wave uC, which is changed into the output
voltage uo by filtering

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ADVANTAGES:
 It retains the advantages of a dual buck inverter as follows: high conversion efficiency,
no reverse recovery of body diode. In addition, the switches of the commutation bridge
work at power frequency; thus, the effect of shoot-through problem can be ignored.
 Compared with other dual buck inverters, the inverter has only one filter inductor; thus,
the volume and weight of the system are observably decreased, and the integration is
more improved.
 Compared with the half-bridge style inverter, the voltage dividing capacitor is not needed
at the dc side, and the voltage stress of power devices can be reduced at the same output
voltage, which is suitable for the high-voltage and high-power occasions

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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:
 Aerospace.
 New energy power generation.
 Smart power grids.
 High voltage and high- power converting fields.

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CONCLUSION:
This paper has proposed a new single inductor dual buck full-bridge inverter, analyzing
the particular working process of the inverter and verifying the process by simulation and
experiment. From the theoretical analysis and experimental result of the prototype, it is obtained
that the proposed inverter has the following advantages. 1) It retains the advantages of a dual
buck inverter as follows: high conversion efficiency, no reverse recovery of body diode. In
addition, the switches of the commutation bridge work at power frequency; thus, the effect of
shootthrough problem can be ignored. 2) Compared with other dual buck inverters, the inverter
hasnonly one filter inductor; thus, the volume and weight ofnthe system are observably
decreased, and the integrationnis more improved. 3) Compared with the half-bridge style
inverter, the voltagedividing capacitor is not needed at the dc side, and the voltage stress of
power devices can be reduced at the same output voltage, which is suitable for the high-voltage
and high-power occasions. 4) The proposed can be used as a grid-connected inverter, and the
leakage current is restrained and meets the safety standard. 5) The structure and control of the
inverter are simple, and easy to be realized. The inverter is suitable for the occasion requiring
highreliability, high conversion efficiency, small volume and weight.

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REFERENCES:
[1] W. Yu et al., “High-efficiency inverter with H6-type configuration for photovoltaic non-
isolated AC module applications,” in Proc. 25th Annu. IEEE APEC, 2010, pp. 1056–1061.
[2] N. R. Zargari, P. D. Zargari, and G. Joos, “Two switch high performance current regulated
DC/AC converter module,” in Conf. Rec. IEEE IAS Annu. Meet., 1995, pp. 929–934.
[3] G. R. Stanley and K. M. Bradshaw, “Precision DC-to-AC power conversion by optimization
of the output current waveform-the half bridge revisited,” IEEE Trans. Power Electron., vol. 14,
no. 2, pp. 372–380, Mar. 1999.
[4] A. M. Knight, J. Ewanchuk, and J. C. Salmon, “Coupled three-phase inductors for interleaved
inverter switching,” IEEE Trans. Magn., vol. 44, no. 11, pp. 4119–4122, Nov. 2008.

Single inductor dual buck full bridge inverter

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Single inductor dual buck full bridge inverter