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.K L
Design and Implementation of a High Step-Up Boost-Sepic
Hybrid Converter with Soft Switching
Sayyed Mohammad Mehdi Mirtalaei(1)- Mahnaz Mohtaj(2) – Hmid Reza Karami(3)
(1) Assistant Professor - Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Esfahan, Iran
mirtalaei.iaun@gmail.com
(2) Msc. – Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Esfahan, Iran
mahnaz.mohtaj@yahoo.com
(3) Assistant Professor - Department of the Electrical Engineering, Bu Ali Sina University, Hamadan, Iran hamidr.karami@basu.ac.ir
In this paper a compound boost- sepic converter with soft switching for high voltage application is proposed. One of the advantages of this converter is that, the main switch is turned on under the ZCS condition without need to any auxiliary switch so we have lower switching loss. In order to increase the voltage gain in this topology, a boost converter used in series with the output stage of sepic converter, therefore the output voltage of boost converter added to the output voltage of sepic converter and the voltage gain has been increased. Also a coupled inductor has been used in the boost converter topology which leads to a further increase in the voltage gain of the converter. In order to evaluate the operation of the proposed converter, simulation results and analysis of converter operational modes are presented. In addition, experimental results are presented for a typical boost-sepic converter. These results verify the proper operation of proposed converter.
Index Terms: Boost-sepic converter, soft switching, high voltage gain.
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) 2 * w , (
: * + − + − + − + − + − + − + − ) Y+ 1 C D < , :( A D N
Fig. (1): Schematic of the proposed boost-sepic converter
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Vcb + (VO2/n
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+
−
+ − + −
+
− +
−
Vin
VO
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L3 L4
Q
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+
−
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+
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−
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Co2
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Do2
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(a)
t0
<
t1
(b)
t1 <
t2
(a)
t2
<
t3
(a)
t3
<
t4
Fig. (2): Equivalent circuit for deferent modes: (a) t0-t1, (b) t1-t2, (c) t2-t3, (d) t3-t4
t0 t1 t2 t3 t4 t5
(vcb-vo1-vl 2+vo2/n)/
LlKg
(Ii+ILM )/ n Ii
ILM
IL2
Ilkg
IQ
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IDO 2
IL2-Ilkg
VC B/Lm -Vo2/(nLm)
Ii+ILM
Ii+ILM
Y+ ) 3 { Y+ :( C -7 *
Fig. (3): Converter waveforms
Y+ ) 4 76 L F ) X { Y+ :(
Fig. (4): Switch voltage and current
) Y+ 5 ( Y+ : 76 ) X {
Y+ ) 6 - , .7 ) X { Y+ :(
) 31 (
Y+ ) 7 :( ) { Y+
DO2
Fig. (7): Diod DO2
) Y+ 8 ) ) X { Y+ :(
DO1
Fig. (8): Diod DO1
Y+ ) 9 ) X { Y+ :(
Fig. (9): Input current
Table (1): Circuit parameters
) X 1 * * A:(
* G * A
4 H Llkg.7
3 ns 5 ,* <
50 F C1,C2 Z
11 F CB Z
MUR460 D2 D1 )
IRF640 Q 5
100 kHz fs-, S J u, 6 :
10 v Vin L F
55 v VO-X Z L F
30 w PO -X Z * <
4 / A B ) "
w w A wC U wsi -w a E E C [) , M ww, * 5 ww * *Www:*
ORCAD
. ww * ww EwwJ* * Vwwi Hww)*
) X EJ* * C U si 1
Y+w . * * , (
) 4 ( ) 5 { Y+ ( H) L F
w 76 ) X n
Q
wR<
Q)*
ZCS
- , ( H EaRF ) ) Y+w .
6 Y+w (
w) X {
Llkg
-w w , * w
.
) Y+w 7 ( ) 8 { w Y+w (
) X w) w
DO1 DO2
wR< * Q)* w
ZCS
w ,
-) Y+ . 9 - ) X { Y+ ( .
5 #: B )
E C - a E Z [) , Hw)* w A wC w
) Y+ . * EJ* * Vi 10
) ( 11 { Y+ ( Hw) L F
76 ) X n
Q
Q)* R<
ZCS
( w Hw EaRF )
- , ) Y+ .
12 ( - , * -X Z L F ) Y+ .
13 (
) 14 ) X { Y+ ( w) w
w
DO1
DO2
Q)* w wR< *
ZCS
-w , ) Y+w . w
15 ( w) X { w Y+w
Llkg w , *
-.
)Y+ 16 - U c * Z Y+ ( .
Y+ ) 10 ) S J ) X { Y+ :( H ) A
H) L F ( ) n
K (
Fig. (10): Switch current (below) and drain-source voltage (above), vertical scale 25V/div or 4A/div, time scale 1µs/div
) Y+ 11 S J L F ) X { Y+ :(
) Y+ 12 :( Y+ -X Z L F {
Fig. (12): Output voltage, vertical scale 50V/div, time scale 1µs/div
Y+ ) 13 ) ) X { Y+ :(
DO1
Fig. (13): Diod DO1 current, vertical scale 1.5A/div, time scale
1µs/div
Y+ ) 14 ) { Y+ :(
DO2
Fig. (14): Diod DO2 current, vertical scale .7A/div, time scale
1µs/div
) Y+ 15 - , .7 ) X { Y+ :(
Fig. (15):Leakage inductance current, vertical scale 1.1A/div, time scale 1µ s/div)
) Y+ 16 A C :(
Fig. (16): Proposed converter
/> ) " D
C D) EF G H)*
-N w M , -, 76 ) X D
EJ* * K L F ) O
Q)* w wR< S J C H)* .
ZCS
w
- -, 76 -: T* 76 S V w6 -, w 76 U w57< H)*
. ) w wC -wX Z D N C -X Z C H)*
- * -C 6 < C D) Y + < E6
D) EF G H)*
E: T* C E [) W< .7 tw8 ? Hw)* * 5 * E6
- V)*W:* O
[) w , 1 w EJ* * E C [) , EF G H)* .
- J < * a, Y 7R< . 6
: A 6
1- Uninterrupted power supply (UPS)
2- High-intensity-discharge (HID)
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