Two stage power conversion architecture suitable

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IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
TWO-STAGE POWER CONVERSION ARCHITECTURE SUITABLE FOR WIDE
RANGE INPUT VOLTAGE
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 “TWO-STAGE POWER CONVERSION
ARCHITECTURE SUITABLE FOR WIDE RANGE INPUT VOLTAGE” 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 “TWO-STAGE POWER CONVERSION
ARCHITECTURE SUITABLE FOR WIDE RANGE INPUT VOLTAGE” 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 “TWO-STAGE POWER CONVERSION
ARCHITECTURE SUITABLE FOR WIDE RANGE INPUT VOLTAGE” 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 presents amerged-two-stage circuit topology suitable for eitherwide-range dc
input voltage or ac line voltage at low-to-moderate power levels (e.g., up to 30 W). This two-
stage topology is based on a soft-charged switched-capacitor preregulator/ transformation stage
and a high-frequency magnetic regulator stage. Soft charging of the switched capacitor circuit,
zero voltage switching of the high-frequency regulator circuit, and time-based power density,
and high power factor. The proposed architecture is applied to an LED driver circuit, and two
implementations are demonstrated: a wide input voltage range dc–dc converter and a line
interfaced ac–dc converter. The dc–dc converter shows 88%– 96%efficiency at 30-W power
across 25–200-V input voltage range, and the ac–dc converter achieves 88% efficiency with 0.93
power factor at 8.4-W average power.

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INTRODUCTION:
In this paper, we explore improved design in this voltage and power range, with a focus
on LED driver circuits as an important application in this space. Light emitting diode devices
promise unprecedented reductions in energy consumption in comparison to incandescent and
fluorescent lights, but come with an as-yet unmet demand for high power density, high
efficiency, and high-power-factor LED driver circuitry.
An examination of commercial LED drivers illustrates this: considering a group of
commercial line interfaced (120 Vac ) LED drivers in the 3–12 W output power range, and
power factors of 0.73–0.93, with no systems achieving both high efficiency and high power
factor. The switching frequencies of these drivers were in the range of 57–104 kHz, with all
having correspondingly low power densities below 5 W/in3.
Recently published academic designs are harder to fully evaluate and compare because of
large variation on LED output configurations (e.g., separation to multiple LED loads or diverse
LED voltage specifications), but appear to provide generally similar performance with moderate
improvements in individual aspects.
Overall, the volume of the converters was uniformly dominated by magnetic components,
and in each case the driver circuit represented a major contribution to the LED system size.
These examinations indicate that power electronics continues to be a significant limitation in
solid-state lighting and that there is a need for major improvements in miniaturization and
performance in this voltage and power range.
.

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EXISTING SYSTEM:
The converter architecture is well-suited to the available devices in such a process: The
SC transformation stage can achieve a large voltage step-down, and can be designed for very
high power density and efficiency using slow, moderate-voltage devices at relatively low
switching frequency. The unregulated voltage, Vunreg is low so that the regulating stage can
utilize fast, low-voltage devices operating at a high switching frequency to provide high-
bandwidth regulation and a small additional voltage step-down. Since the regulation stage
operates at a high frequency, the size of its passive components can be made small. By
separating the transformation and regulation stage in this manner, the benefits typically
associated with SC converters (i.e. high efficiency, high power density) can be preserved, while
the main drawback (poor regulation) is done away with by the use of a separate magnetic
regulation stage

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PROPOSED SYSTEM:
The first stage is a variable-topology SC circuit operating at moderate switching
frequencies (e.g., tens to hundreds of kilohertz). The SC circuit can achieve high power density
and efficiency at these frequencies because it employs only switches and capacitors and
incorporates soft-charging operation. However, the SC converter alone cannot efficiently provide
the fine voltage regulation capability needed in this application. Instead, this stage serves both to
reduce the voltage range over which the second stage needs to operate, and to reduce the
maximum voltage level (and hence impedance level) for which the second stage must be
designed, in keeping with the design considerations described in the previous section.
The second stage is a magnetic-based stage that provides both additional voltage
transformation and fine voltage regulation, and is operated at high frequency (e.g., HF, 3–30
MHz) in order to minimize magnetic component size. High-frequency operation is more readily
achieved with high efficiency in the second stage because it operates at lower voltages and
smaller voltage range with voltage transformation of the SC first stage.

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ADVANTAGES:
 Increases in switching frequency.
 Low device stress, high efficiency, high power density, and high power factor

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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:
 LED driver applications.

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CONCLUSION:
A merged two-stage power conversion architecture and associated circuit topology and
its application to LED driver circuits are demonstrated. This approach is specifically designed to
address the challenges of low-power conversion from high and wide-range input voltages. A
soft-charged multimode SC converter stage is introduced that provides compression of an 8:1
input range to a 2:1 output range. Depending on operating mode, this topology provides partial
or complete soft charging of the capacitors appropriate load. We detail operation of this
reconfigurable transformation stage and also introduce appropriate drive and bootstrap
techniques for it. We further show that merging this stage with a resonant transition
discontinuousmode inverted buck converter enables conversion from a high, wide-range input
voltage down to a low output voltage at greatly increased operating frequencies, and
consequently greatly reduced magnetics size.

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REFERENCES:
[1] (2009, Mar.). Multi-Year Program Plan FY’09-FY’15 Solid-State Lighting Research and
Development. Office of Energy Efficiency and Renewable Energy, U.S. Dept. of Energy by
Navigant Consulting, Radcliffe Advisors, and SSLS. [Online]. Available: http://www.osti.gov/
scitech/servlets/purl/953678
[2] S. Wang, X. Ruan, K. Yao, S.-C. Tan, Y. Yang, and Z. Ye, “A flickerfree electrolytic
capacitor-less AC-DC led driver,” IEEE Trans. Power Electron., vol. 27, no. 11, pp. 4540–4548,
Nov. 2012.
[3] X. Wu, C. Hu, J. Zhang, and C. Zhao, “Series-parallel autoregulated charge-balancing
rectifier for multioutput light-emitting diode driver,” IEEE Trans. Ind. Electron., vol. 61, no. 3,
pp. 1262–1268, Mar. 2014.
[4] J. Zhang, H. Zeng, and T. Jiang, “A primary-side control scheme for highpower- factor LED
driver with triac dimming capability,” IEEE Trans. Power Electron., vol. 27, no. 11, pp. 4619–
4629, Nov. 2012.
[5] X. Xie, M. Ye, Y. Cai, and J. Wu, “An optocouplerless two-stage high power factor LED
driver,” in Proc. IEEE 26th Annu. Appl. Power Electron. Conf. Expo., 2011, pp. 2078–2083

Two stage power conversion architecture suitable

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Two stage power conversion architecture suitable