1 Series Resonant Converter with Series-Parallel Transformers for High Input Voltage Applications C-H Chien 1 ,B-R Lin 2 ,and Y-H Wang 1 1 Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan 2 Department of Electrical Engineering, National Yunlin University of
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Series Resonant Converter with Series-Parallel Transformers for High Input Voltage Applications
Series Resonant Converter with Series-Parallel Transformers for High Input Voltage Applications. C-H Chien 1 ,B-R Lin 2 ,and Y-H Wang 1 1 Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan - PowerPoint PPT Presentation
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Series Resonant Converter with Series-Parallel Transformers for High Input Voltage Applications
C-H Chien1,B-R Lin2,and Y-H Wang1
1 Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan
2 Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan
For 3-phase 380V (or 480V) AC/DC converters the DC bus voltage > 500V (or 650V)
∴ select suitable power MOSFETs → difficult 3 level neutral-point clamp converter → overcome these drawbacks
more power switches more circuit components high cost complicated control schemes split capacitors and clamp diodes
the Vstress of MOSFETs → ½ DC bus voltage
What’s for in this study?
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What’s new in this study? A novel DC/DC converter (24V/40A, 960W)
2 circuit modules for high voltage application 2 capacitors and 2 half-bridge
series in high Voltage clamp the Vstress of MOSFET
Vstress = ½ input V
interleaved switching signal→ phase-shift ¼ switching T → 90° reduce ripple current (input and output) share the load current reduce the size of magnetic core
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Why is the topology ?
A series resonant tank high conversion efficiency high power density 2 series Transformers
balance the 2 winding current all semiconductors soft switching
switching loss ↓ ∵ (ZVS & ZCS)
wide input voltage and load 480V~600V all load
2 windings in parallel Istress ↓
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Circuit configuration
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Circuit configuration and key waveforms
Key waveforms Circuit configuration
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Different modes during 1 period
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
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Mode 1 ( t0≦t < t1 ) S1 off , S2 → off
VLm1=nVo= VLm2
Cs1, Cs2, and Lr1 → resonant iLr1
Cs2 => from 0 V → Vin/2 → charge Cs1 => from Vin/2 → 0 V → discharge
iLm1 → iLm2 → iD1 → iD3 →
mmmm
LmLm LLLL
ttnVtiti
21
00022 ,
)()()(
))()(()( 111 titinti LmLrD
))()(()( 213 titinti LmLrD
s
p
m
LmLmn
nn
L
ttnVtiti
,
)()()( 00
011
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Mode 2 ( t1≦t < t2 ) S2 off , S1 → ZVS→ on
iLm1= iLm2= iLr1 → mode end VLm1=nVo= VLm2
Cr1 and Lr1 → resonant applied voltage = (Vin/2 - 2nV0)