Download Title - IJETR

829
International Journal of Emerging
Technology & Research
Volume 1, Issue 4, May-June, 2014
(www.ijetr.org)
ISSN (E): 2347-5900 ISSN (P): 2347-6079
High Efficiency Single Input Triple Output Dc-Dc Converter
Kamala Chindhu.M1, Belcy Jenifer.J2, Sangeetha.P3
1, 2, 3
PG Student, Department of Electrical and Electronics Engineering, Loyola Institute Of Technology,
Chennai
Abstract-In this paper, a single input triple output DCDC converter is designed and developed using coupled
inductor. Portable applications require multiple
outputs with different output levels. This converter
boosts the low-voltage input power source to a
controllable high-voltage dc bus, middle-voltage output
terminals and inverted output terminal. The
controllable high voltage dc terminal can be used as
active front terminal of a DC-AC converter (inverter)
and also used as the main power source for high
voltage DC load. Middle voltage output terminal can
be used for charging battery modules and also can be
used for individual middle voltage DC loads. Some
applications require negative outputs. Coupled
inductor based DC-DC converter gives high efficiency
power conversion, various output voltages with
different levels and high step up ratio. Simulation of
proposed converter is done and results obtained are
satisfactory.
Keywords: DC-DC converter, coupled inductor, single
input triple output converter, high efficiency
conversion
power
1. INTRODUCTION
Portable devices are made of various sub modules that can
provide several functions like Liquid crystal display (LCD),
Light Emitting Diode(LED) backlight and various utilities.
These applications require step-up, step-down and bipolar
supplies. Power management design comprises boost to
step-up, buck to step-down and buck-boost for negative
supply.
Some of the works are capable of delivering buck and
boost outputs along with inverted outputs. Various voltage
levels are also used in power converters of an FC
generation. Several studies have been carried out in Single
input multiple output with different voltage gains and are
combined to satisfy the requirements of various voltage
© Copyright reserved by IJETR
levels so that the system control is complicated and cost is
more. The main aim of this study is to design a single input
triple output converter with increased conversion
efficiency, high step up ratio, saving the manufacturing
cost.
A SIMO converter was investigated with two outputs from
a single input using single switch [1]. The multiple output
dc-dc converter uses the soft switching technique and
reduces switching losses but it is more complicated
because of the three full-bridge converter [2]. A new multi
output dc-dc converter has been designed which can share
its output between different series of output voltages for
low and high power applications [3].A SIMO converter is
designed which is capable of generating buck, boost and
inverted outputs simultaneously but it is applicable only
for low power application and more than one switch for
one output is used [4].
This newly designed SITO converter with coupled
inductor uses three power switches to achieve the
objectives of high efficiency power conversion, high stepup ratio and different output voltage levels. Auxillary
inductors are designed in order to adjust the middle
voltage output terminals, and the output voltages of high
voltage dc bus is controlled by proportional integral
control. This converter study is organized into five sections.
First is introduction in section I, SITO converter design is
given in the section II, circuit operation in section III,
simulation studies in section IV, results and discussion in
section V and conclusion in section V.
The text must be in English. Authors whose English
language is not their own are certainly requested to have
their manuscripts checked (or co-authored) by an English
native speaker, for linguistic correctness before submission
and in its final version, if changes had been made to the
initial version. The submitted typeset scripts of each
contribution must be in their final form and of good
appearance because they will be printed directly. The
(Impact Factor: 0.997)
829
International Journal of Emerging Technology & Research
(www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079
Volume 1, Issue 4, May-June, 2014
document you are reading is written in the format that
should be used in your paper.
3. CIRCUIT OPERATION
3.1 Operating Modes
2. NEW CONVERTER DESIGN
1) Mode 1(t0-t1)
The circuit diagram of proposed SITO converter is shown
in Fig.1.This SITO converter consists of five parts
including low voltage side circuit(LVSC), an auxillary
circuit, a middle-voltage circuit, a high voltage side
circuit(HVSC) and an inverted circuit. The symbols
represented in the diagram are given below. Vin and V01
denotes the voltages of the input power source and the low
voltage side output load and the auxillary circuit. iin and
i01 are the currents of input and low voltage side circuit
and auxillary circuit.V02 and i02 are the output voltage
and current in the high voltage side circuit. Cin,C01,C02
and C04 are the filter capacitors at the low voltage side
circuit, the auxillary circuit, high voltage side circuit and
the inverted circuit.C1 and C2 are the low voltage and
high voltage side capacitors .Lp and Ls are the primary and
secondary inductors of coupled inductor Tr. Primary side
inductor is connected to the low voltage side and Laux is
the auxillary circuit inductor.R01, R02 and R03 are the
output voltages of auxillary circuit, high voltage side
circuit and inverted circuit. The main switch is represented
as S in the low voltage side and S1 and S2 are the switches
in inverted circuit.
In this mode the switch S turned ON . the diode D3 is also
turned ON with the positive polarity of the coupled
inductor causing capacitor C2 to get charged by secondary
current. while Laux releases the charge completely causing
diode D2 to turn OFF completing the mode. Also when
switch S1 is ON and switch S2 is OFF the diode D6 is
forward biased thus charging capacitor C3.
2)Mode 2(t1-t2)[Fig.3]
In this mode the switch S is turned ON continuously
causing the primary inductor to be charged by input source
and by the magnetizing current ILmp. At the same time,
the voltage capacitor C2 is charged by secondary voltage
through the diode D3. while Laux releases the charge
completely causing diode D2 to turn OFF completing the
mode. Also when switch S1 is ON and switch S2 is OFF
the diode D6 is forward biased thus charging capacitor C3.
3)Mode 3(t2-t3)[Fig.4]
With switch S turned OFF , the secondary voltage
continues to charge the capacitor C2 through diode D3.the
diode D1 is turned ON when the voltage across the switch
S is greater than the voltage across capacitor C1 thus
charging capacitor C1.at the same time the diode D2
conducts when the partial energy is transferred to auxillary
inductor from primary inductor Lkp causing the current to
pass through diode D2 to the hvsc load. Also when the
coupled inductor releases it energy completely the diode
D3 is turned OFF and switch S1 is turned ON and Switch
S2 is turned OFF thus causing diode D6 to be forward
biased charging capacitor C3.
4)Mode 4(t3-t4)[Fig.5]
With switch S turned OFF , a secondary current is induced
in reverse to flow through diode D4 to HVSC from
magnetizing inductor and also partial energy of the
leakage inductor is transmitted to auxillary inductor
causing D2 to conduct supplying power to the output in
auxillary circuit. By keeping switch S1 is turned OFF and
switch S2 is turned ON causing diode D5 to conduct
charging capacitor C2 and supplies power to inverter load.
Fig.1 System configuration of Single input triple output DC-DC
converter
© Copyright reserved by IJETR
5)Mode 5(t4-t5)[Fig.6]
With switch S turned OFF, diode D1 turns OFF because
iLkp equals to the auxillary current. The input power,
primary winding of the transformer and the auxillary
inductor connected in series to supply the power to the
auxillary output through D2.At the same time, input power
(Impact Factor: 0.997)
830
International Journal of Emerging Technology & Research
(www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079
Volume 1, Issue 4, May-June, 2014
source, secondary winding of the transformer, the capacitor
C1, C2 connected in series to supply energy to HVSC
through D4. By keeping switch S1 is turned OFF and
switch S2 is turned ON causing diode D5 to conduct
charging capacitor C2 and supplies power to inverter load.
6)Mode 6(t5-t6)[Fig.7]:
With switch S turned ON , The Diode D2, capacitor C1,
secondary winding of the coupled inductor, middle voltage
capacitor C2 connected in series to release the energy into
HVSC through the diode D4 causing Laux to release its
energy through the diode D2. Also switch S1 is turned
OFF and switch S2 is turned ON causing diode D5 to
conduct and charge capacitor C2 and supplying power to
the inverted load. The main switch S is turned On and the
coupled inductor is charged by the input power source and
when the switch is turned OFF, the coupled inductor
releases its stored energy to the auxillary circuit.
Figure.4 Mode 3
Figure.5 Mode 4
Figure.2 Mode 1
Figure.6 Mode 5
Figure.3 Mode 2
© Copyright reserved by IJETR
(Impact Factor: 0.997)
831
International Journal of Emerging Technology & Research
Volume 1, Issue 4, May-June, 2014
(www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079
Figure.7 Mode 6
The main switch S is turned On and the coupled inductor is
charged by the input power source and when the switch is
turned OFF, the coupled inductor releases its stored
energy to the auxillary circuit.
auxillary circuit output is used for charging auxillary
power sources like batteries. The high voltage side circuit
gives an output of 200V which is used as an active front
terminal of a dc-ac inverter is given in Fig.9(c).
Figure.9 Input and output voltages
4. SIMULATION
STUDIES
It can also be taken as the main power source for a high
voltage dc bus. The inverted side circuit gives an output of
-170V in Fig.9(d).
Table I
INPUT AND OUTPUT VOLTAGES
Input voltage
12V
Auxillary circuit
output
24V
HVSC output
200V
Inverted circuit
output
170V
Figure.8 Simulation circuit
6. CONCLUSION
On the basis of obtained design, simulation results are
carried out. The voltage is measured across the low voltage
side, auxillary circuit , high voltage side and inverted side
circuit. Capacitors are added across each load for filtering
purpose. The output voltage gets boosted by charging the
coupled inductors and auxillary inductor
5. RESULTS AND DISCUSSIONS
The simulated input and output voltages are given below.
From the results three output voltages are obtained from a
single input with a switching frequency of 100kHz. 12V is
given as input for the SITO converter which is shown in
the Fig.9(a) A single input is given to the circuit and three
outputs are achieved. Fig.9(b)shows the auxillary circuit
output of 24V boosted by the coupled inductor. This
This study has successfully developed a high-efficiency
SITO dc–dc converter, and this coupled-inductor-based
converter was applied well to a single-input power source
plus three output terminals composed of an auxiliary
battery module, a high-voltage dc bus and inverted output.
The major scientific contributions of the proposed SITO
converter are as follows: 1) this topology uses single input
to achieve the objective of high-efficiency power
conversion; 2) an auxiliary inductor is designed for
providing the charge power to the auxiliary battery. The
high-efficiency SITO converter topology provides
designers with an alternative choice for boosting a lowvoltage power source to multiple outputs with different
voltage levels efficiently.
It is not appropriate to be used as the active front for DCAC multilevel inverters. So future work is to design it as a
front terminal for DC-AC multilevel inverters.
REFERENCES
[1]
Rong-Jong Wai and Kun-Huai Jheng,”HighEfficiency Single-Input
C-DC Converter,” IEEE
Trans.Power Electron., vol.28,no.2, pp.886-898 ,Feb
2013
© Copyright reserved by IJETR
(Impact Factor: 0.997)
832
International Journal of Emerging Technology & Research
(www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079
Volume 1, Issue 4, May-June, 2014
[2] Y. Chen, Y. Kang, S. Nie, and X. Pei, “The multipleoutput DC–DC converter with shared ZCS lagging
leg,” IEEE Trans. Power Electron., vol. 26, no. 8, pp.
2278–2294, Aug. 2011.
[3] A. Nami, F. Zare, A. Ghosh, and F. Blaabjerg,
“Multiple-output DC–DC converters based on diodeclamped converters configuration: Topology and
control strategy,” IEEE Power Electron., vol. 3, no. 2,
pp. 197–208,2010.
[4] P. Patra, A. Patra, and N. Misra, “A single-inductor
multiple-output switcher with simultaneous buck, boost
and inverted outputs,” IEEE Trans. Power Electron.,
vol. 27, no. 4, pp. 1936–1951, Apr. 2012.
[5] H.Wu, R. Chen, J. Zhang, Y. Xing, H. Hu, and H. Ge,
“A family of three port half-bridge converters for a
stand-alone renewable power system,” IEEE Trans.
Power Electron., vol. 26, no. 9, pp. 2697–2706, Sep.
2012.
© Copyright reserved by IJETR
(Impact Factor: 0.997)
833