In this paper an approach of a step-up/down dc-dc converter with wide range conversion called Boost2-Buck is presented. The proposed converter presents non pulsating input and output current. It has operations equivalent to a cascade converter consisting of two boost converter and one buck converter, but with the advantage of using single active switch. Mathematical analysis and experimental results are presented for converter operating with output power of 20W

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A Non-Insulated Step-Up/Down DC-DC Converter
with Wide Range Conversion
ABSTRACT:
In this paper an approach of a step-up/down dc-dc converter with wide range conversion called
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Boost
2
-Buck is presented. The proposed converter presents non pulsating input and output
current. It has operations equivalent to a cascade converter consisting of two boost converter and
one buck converter, but with the advantage of using single active switch. Mathematical analysis
and experimental results are presented for converter operating with output power of 20W.
KEY WORDS:
1. Buck-Boost converters
2. converters
SOFTWARE: MATLAB/SIMULINK

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CIRCUIT DIAGRAM:
Fig: 1 Schematic boost
2
-buck.
EXPECTED SIMULATION RESULTS:
Figure 2. Waveforms for Vi=180V (Bottom: Voltage on capacitor 0020 Figure 3. Waveforms for Vi=180V (Bottom: Voltage on capacitor C
2
–
C
1
– 100V/Div; Top: Voltage V
DS
on Switch S – 100V/Div). 100V/Div; Top: Voltage V
DS
on Switch S – 100V/Div).

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Figure 4. Waveforms for Vi=180V (Bottom: Voltage on Figure 5. Efficiency of the boost
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2
-buck Converter
capacitor C
3
– 50V/Div; Top: Voltage V
DS
on Switch S – 100V/Div).
CONCLUSION:
The boost
2
-buck converter presented in this paper provides a wide range of dc conversion when
compared with the conventional non-insulated dc-dc converters. This topology presents non
pulsating input and output current. It has operations equivalent to a cascade converter consisting
of two boost converter and one buck converter, but with the advantage of using single active
switch. Consequently, when compared with a converter cascade, it is cheaper, less bulky and
uses circuit control simpler. Through the experimental results is possible to prove the
performance of the converter as well as the theoretical analysis presented.

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REFERENCES:
[1] J. A. Morales-Saldaña, J. Leyva-Ramos, E. E. Carbajal-Gutiérrez, M. G. Ortiz-Lopez,
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Power Electronics Specialists Conference, Rhoedes, 2008.
[3] J. R. de Britto, A. E. Demian Jr., E. A. A. Coelho, L. C. de Freitas, V. J. Farias, J. B. Vieira
Jr., “LED Lamp Driver Using a Converter with Wide Range Conversion Microcontroller-
Based,” 34th Annual Conference of the IEEE Industrial Electronics Society (Accepted), Orlando,
2008.
[4] J. A. Morales-Saldaña, J. Leyva-Ramos, E. E. Carbajal-Gutiérrez, “Modeling of Switch-
Mode DC-DC Cascade Converters,” IEEE Trans. on Aerospace and Electronic Systems, vol. 38,
pp. 295–299, Jan. 2002.
[5] D. Maksimovic, S. Cuk, “Switching Converters with Wide DC Conversion Range,” IEEE
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