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Power e Lab HKU . Power e Lab HKU. A ZVS approach for AC/DC converter with PFC. The Power Electronics Lab., Hong Kong University N. K. Poon C. P. Liu M. H. Pong Speaker Bryan M. H. Pong. Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ 1. Load. Power e Lab - PowerPoint PPT Presentation
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A ZVS approach for AC/DC converter with A ZVS approach for AC/DC converter with PFCPFC The Power Electronics Lab., Hong Kong The Power Electronics Lab., Hong Kong
UniversityUniversityN. K. Poon N. K. Poon C. P. Liu C. P. Liu M. H. PongM. H. Pong
Speaker Speaker Bryan M. H. PongBryan M. H. Pong
PowereLab HKU
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 11Power Power eeLabLab
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Some basic concepts
Input rectifiers and capacitor produce Pulsating input current
Harmonic currents are generated
Load
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 22Power Power eeLabLab
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A conventional method
A boost converter and a DC/DC converter
IpfcIdc
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 33Power Power eeLabLab
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A popular method among researchers
Single stage design which combines the boost and the DCDC converters
IpfcIdc
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 44Power Power eeLabLab
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Is single stage design always better?
Let us take a look
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Why two-stage design?Why two-stage design?
Ipfc Idc
•AdvantageAdvantage•Losses Losses IIpfcpfc
22 + + IIdcdc22
•Fix DCDC input Fix DCDC input voltagevoltage•Controllable bulk Controllable bulk voltagevoltage
•DisadvantageDisadvantage•Need two controllersNeed two controllers•One more MOSFETOne more MOSFET
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 66Power Power eeLabLab
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Why single-stage design?Why single-stage design? •AdvantageAdvantage
•One controllerOne controller•One MOSFET lessOne MOSFET less
•DisadvantageDisadvantage•Losses Losses ( (IIpfcpfc + + IIdcdc))22
•High High IIdcdc at low lineat low line•Higher Higher IIpfcpfc •High current stressHigh current stress•High voltage stressHigh voltage stress
IpfcIdc
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 77Power Power eeLabLab
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Good reasons for two-Good reasons for two-stagestage
oSingle StageSingle Stage•AdvantagesAdvantages
•One controllerOne controller•One MOSFET lessOne MOSFET less
•DisadvantagesDisadvantages•Losses Losses ( (IIpfcpfc + + IIdcdc))22
•High High IIdcdc at low lineat low line•Higher Higher IpfcIpfc •High current stressHigh current stress•High voltage stressHigh voltage stress
oTwo-StageTwo-Stage•AdvantagesAdvantages
•Losses Losses IIpfcpfc22 + + IIdcdc
22
•Fix DCDC input Fix DCDC input voltagevoltage•Controllable bulk Controllable bulk voltagevoltage
•DisadvantagesDisadvantages•Need two controllerNeed two controller•One more MOSFETOne more MOSFET
Prepared by Franki Poon Prepared by Franki Poon www.eee.hku.hk/power_electronics_lab/ www.eee.hku.hk/power_electronics_lab/ 88
Power Power eeLabLab
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Our new idea Our new idea Boost + Asymmetric half-bridge with soft Boost + Asymmetric half-bridge with soft switchingswitching
DDMpfcMpfc > D > DM2M2
Mpf
c
M2
M1
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Zero voltage state -Zero voltage state - M M22
MM11 turn off then . .turn off then . .
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AfterAfter M M22 turn onturn on
Zero voltage state -Zero voltage state - M Mpfcpfc
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MM22 turn onturn onMpMpfcfc turn onturn on
Two separate convertersTwo separate converters
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M2 turn offMpfc turn on
Zero voltage state –Zero voltage state – M M11
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MM11 turn onturn onMpMpfcfc turn onturn on
One cycle on asymmetricOne cycle on asymmetric
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MM11 turn onturn onMpMpfcfc turn offturn off
One cycle on PFCOne cycle on PFC
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It’s great, but . . . It’s great, but . . . If If DDMpfcMpfc < D < DM2M2
DDMpfc Mpfc == DDM2M2
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For allFor all D DMpfcMpfc and all and all DDM2M2
Mpf
c
M2
M1
Maux
After all – After all – small small MMauxaux added added
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M2 gate drive
M1 gate drive
Maux gate drive
Mpfc gate drive
Final timing arrangement Final timing arrangement
A
B
VVAA = V = VBB
VVMaux_dsMaux_ds = V = VAA-V-VBB =0 =0
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Mpf
c
M2
M1
Maux
Doff
guarantee a path for Laux current when M2 off at any time
Practical consideration Practical consideration
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STPS12NM50
Practical circuit – Practical circuit – O/P O/P 12V@10A12V@10A
250uH
STD5NM50
IRF840A
12uH
STPS12NM50
8uH
Two diodes are used to clamp
ringing
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M2 gate
M1 gate
Maux gate
Mpfc gate
L5991
O/PSync
O/P
SyncL4981
Simplified timing circuit Simplified timing circuit
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How does it look? How does it look?
Width = 12.6cmWidth = 12.6cm
Depth = 6.3cmDepth = 6.3cm
Height = 1.9cmHeight = 1.9cm
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ZVS on ZVS on MM22
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ZVS on ZVS on MMpfcpfc
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ZVS on ZVS on MMpfcpfc & & MM22
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Power loss vs. Output power at 115V input
02
46810121416
0 24 48 72 96 120
Output power/W
Pow
er lo
ss/W
Efficiency vs. Input voltage at 12V@10A output
80828486889092949698100
90 100 115 150 200 230 240
Input voltage/V
Effic
ienc
y/%
Losses and EfficiencyLosses and Efficiency
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Finally . . . Finally . . . •Simple Boost + Asymmetric Half-bridge configuration – Good Combination.•All ZVS behaviors – Very little added cost.•Two separate converter – Easy to control•Active diode can be incorporated – <1W no load power•Simple PWM controller – simple ASIC
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