High voltage step- up DC- DC converter using

coupled inductor and switched capacitor

techniques

UNDER THE GUIDENCE OF

Mr P.Hema sundar M-Tech,

Assistant professor.

BATCH NO: EEEK6141508,

V.SANTOSH KUMAR(12K65A0214).

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Problem Definition

By connecting the PV solar cell can in series to produce the

high voltages but, the voltage might effect by shadow effect.

If any one of the PV cell is broken ,the PV array leads to

shutdown the grid.

Those problems can be overcome by using the converters(DC-

DC converter).

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CONTENTS:

Abstract

Introduction

Types of converters

Applications

Design&analysis

Simulation of converter

References

Pos&peos

Plan of action3

ABSTRACT

The coupled inductor and switched capacitor a technique is proposed in high

voltage step up dc-dc converter.

The capacitors are charged in parallel and discharged in series by the coupled

inductor, stacking on the output capacitor.

On performing this project can achieve high step up voltage gain in which

the input dc voltage is 24 volts and we will get output voltage 400 volts with

appropriate duty ratio.

Besides the voltage spike on the main switch can be clamped, therefore

conduction losses are reduced and hence efficiency will be increased.

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Introduction

Renewable energy systems are

more and more widely used to

provide electric energy.

Energy derived from natural

processes that are replenished at a

faster rate than they are consumed.

28% of electricity was produced by

Renewable energy sources in over

all production.

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Modernly converters are classified into two types

Non isolation converters(basic):

Buck converter

Boost converter

Buck-boost converter

Isolation converters:

Fly back converter

Forward converter

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Comparison Of Converters

Buck converter: step-down, has one switch, simple, high

efficiency greater than 90%, provides one polarity output voltage

and unidirectional output current.

Boost converter: step-up, has one switch, simple, high

efficiency, provides one polarity output voltage.

Buck-boost converter: step-up/step-down, has one switch,

simple, high efficiency, provides output voltage polarity reversal.

Fly back converter: four-quadrant operation, has multiple

switches, can be used in regenerative braking.

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Methods to produce high voltages

Capacitor means:

cascaded boost converter techniques

Voltage-lift techniques

Inductor means:

coupled inductor techniques

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HISTORY

Integrated boost- sepic converter

• Limited step up voltage

• Parasitic resistance

Boost converter with coupled inductor

• Active clamp circuit

• Zero-voltage switching

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Transformer less dc-dc converter

• Conventional dc-dc boost converter has low efficiency

• High step up voltage gain is low

A Generalized high voltage gain boost converter

• High voltage gain

• Lower blocking voltage across the controller switches

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Applications

Regulated switch mode power supply,

Dc motor drives,

Electric automobiles, trolley cars,

Marine hoists, mine haulers,

Personalcomputers, office equipment,

spacecraft power systems, laptop

computers,

Telecommunications equipment.

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Subjects related to my project

Power electronics

Power systems

Electrical machines

Electrical circuit analysis

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Design & Analysis

The DC to DC converter is used to step up the given input

voltage.

Input voltage is 24V as mentioned in the proposed converter.

That volage is step up by using the converter into 400V DC

supply without any ripples at load.

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Circuit Diagram

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Operation Of Converter

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SIMULATION CIRCUIT FOR PROPOSED

CONVERTER

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Input voltage

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Output Voltage

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References

[1] K. B. Park, H. W. Seong, H. S. Kim, G. W. Moon, and M. J. Youn, “Integrated boost-sepic converter for high step-up

applications,” in Proc. Power Electron. Spec. Conf., Rohode, Greece, 2008, pp. 944–950.

[2] T. F. Wu, Y. S. Lai, J. C. Hung, and Y. M. Chen, “Boost converter with coupled inductors and buck-boost type of

active clamp,” IEEE Trans. Ind. Electron., vol. 55, no. 1, pp. 154–162, Jan. 2008.

[3] B. Axelrod, Y. Berkovich, S. Tapuchi, and A. Ioinovici, “Steep conversion ration C´ uk, Zeta, and sepic converters

based on a switched coupled inductor cell,” in Proc. IEEE Power Electron. Spec. Conf., Jun. 2008, pp. 3009–3014.

[4] R. J. Wai, C. Y. Lin, C. Y. Lin, R. Y. Duan, and Y. R. Chang, “High efficiency power conversion system for kilowatt-

level stand-alone generation unit with low input voltage,” IEEE Trans. Ind. Electron., vol. 55, no. 10, pp. 3702–3714,

Oct. 2008.

[5] V. Scarpa, S. Buso, and G. Spiazzi, “Low-complexity MPPT technique exploiting the PV module MPP locus

characterization,” IEEE Trans. Ind. Electron., vol. 56, no. 5, pp. 1531–1538, May 2009.

[6] A. Timbus, M. Liserre, R. Teodorescu, P. Rodriguez, and F. Blaabjerg, “Evaluation of current controllers for

distributed power generation systems,” IEEE Trans. Power Electron., vol. 24, no. 3, pp. 654–664, Mar. 2009.

[7] L. S. Yang, T. J. Liang, and J. F. Chen, “Transformer-less dc-dc converter with high voltage gain,” IEEE Trans. Ind.

Electron., vol. 56, no. 8, pp. 3144–3152, Aug. 2009.

[8] S. V. Araujo, R. P. Torrico-Bascope, and G. V. Torrico-Bascope, “Highly efficient high step-up converter for fuel-cell

power processing based on three-state commutation cell,” IEEE Trans. Ind. Electron., vol. 57, no. 6, pp. 1987–1997, Jun.

2010.

[9] C. L. Chen, Y. Wang, J. S. Lai, Y. S. Lee, and D. Martin, “Design of parallel inverters for smooth mode transfer micro

grid applications,” IEEE Trans. Power Electron., vol. 25, no. 1, pp. 6–15, Jan. 2010.

[10] S. K. Changchien, T. J. Liang, J. F. Chen, and L. S. Yang, “Novel high step-up dc-dc converter for fuel cell energy

conversion system,” IEEE Trans. Ind. Electron. vol. 57, no. 6, pp. 2007–2017, Jun. 2010.

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POS:

Program Educational Objectives Relevance

Graduates shall have good technical knowledge

and skills in the area of Electrical & Electronics

engineering to fulfill the needs of industry and

society.

We got good

technical skills

by doing this

project

Graduates shall have research capabilities to

achieve success in their chosen fields with team

work

We got more

knowledge about

mentioned fields

Graduates shall be successful engineers with

lifelong learning, right attitude and Ethics

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PEOS:

Program Outcomes Relevance

An ability to apply knowledge of mathematics,

science, and engineering.

While doing a design of converter

An ability to design and conduct experiments, as

well as to analyze and interpret data.

We can Conduct more experiments in MAT-

LAB

An ability to design a system, component, or

process to meet desired needs within realistic

Constraints such as economic, environmental,

social, political, ethical, health and safely.

Manufacturability and sustainability.

Converter is used for environmental,scoitey

needs to achieve high voltage

An ability to function on multi-disciplinary teamsMaths,science,engineering and management

An ability to identify, formulate, and solve

engineering problems

Identified problem by using non renewable

energy sources

An understanding of professional and ethical

responsibility22

PEOS:Program Educational Objectives Relevance

An ability to communicate effectively

The broad education necessary to understand the impact of

engineering solutions in a global, economic, environmental and

societal context

A recognition of the need for, and an ability to engage in life-long

learning

A knowledge of contemporary issues

An ability to use the techniques, skills, and modern engineering tools

necessary for engineering practice.

We can use more

techniques,skills noting but

coulped inductor.

An ability to carry out research in the field of Power Electronics and

Power Systems resulting in product development.

Why because, my project is

power electronics oriented

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CONCLUSION

To have large high step-up voltage gain, some converters have

been proposed which use the coupled-inductor as a transformer

in fly back and forward converter.

To get large efficiency of converter, reduces the conduction

losses and voltage spikes occurs across the power switch.

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PLAN OF ACTION

S.NO ACTION STEPS COMPLETION DATE

1 Title and Abstract 28/07/2014

2 Literature survey and po’s and peo’s 18/09/2014

3. Modeling of circuit 15/10/2014

4 Simulation of converter 29/12/2014

5 Fabrication of converter 28/01/2015

6 Results & documentation thesis with rough

copy

27/02/2015

7 Thesis submission(softcopy and hardcopy) 15/03/2015

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