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Licensed Unlicensed Requires Authentication Published by De Gruyter July 26, 2018

A Buck-Boost DC/DC Converter with High Efficiency Suitable for Renewable Energies

  • M Maalandish ORCID logo EMAIL logo , S. H. Hosseini , T Jalilzadeh and S Pourjafar

Abstract

In this paper, a non-isolated buck-boost dc/dc converter with only one switch is presented. The proposed converter consists of one switch in the input side (S), four inductors, four diodes, six capacitors and a capacitor in the output side (Co). In fact, the combination of the inductor, diode and capacitor leads voltage level is increased. Actually, the voltage stress on power switch is decreased for higher power limits at various duty-cycles by combining these components. Therefore, conduction losses can be reduced by using a switch with lower resistance RDS(ON). Another advantage of the proposed converter is that the normalized voltage stress on diodes is low. As a result, the efficiency of proposed converter is high. In order to investigate the competences of the proposed converter, comparison results with other structures are provided. The principle of operation, theoretical analysis and the experimental prototype of proposed converter in about 120 W with operating at 25 kHz are provided.

Appendix

A

Nomenclature

D

Duty-Cycle

M

Voltage conversion ratio

MD

Normalized voltage stress across diode

MS

Normalized voltage stress across switch

TS

Period of switching

CCM

Continuous conduction mode

DCM

Discontinuous conduction mode

fS

Switching frequency

ΔI

Current ripple across the inductors

I

Sum of the peak current of all inductors

Pr-DS(ON)

Losses of on-state resistance

Pswitching

Losses of switching

PRF

Losses of forward resistance

PVF

Losses of forward voltage

PL

Losses of inductors

PRc

Losses of capacitors

Ltot

Equivalent inductor

ξb

Boundary normalized inductor time constant

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Received: 2017-11-24
Revised: 2018-06-26
Accepted: 2018-07-03
Published Online: 2018-07-26

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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