再谈LLC串联谐振变换器
Delta Electronics (Shanghai) Design Center
Alpha J. Zhang 章进法
Shanghai, March 2010
LLC Series Resonant Converter
再谈LLC串联谐振变换器
Delta Confidential
Delta Electronics (Shanghai) Design Center
PFC
Rectifier
DC/DC
Converter
1. PFC rectifier for satisfy...
Delta Electronics (Shanghai) Design Center
Alpha J. Zhang 章进法
Shanghai, March 2010
LLC Series Resonant Converter
再谈LLC串联谐振变换器
Delta Confidential
Delta Electronics (Shanghai) Design Center
PFC
Rectifier
DC/DC
Converter
1. PFC rectifier for satisfying input harmonic current limit
2. 400v Bus voltage design for small bus capacitor selection
3. DC/DC Converter operates at 400v input at normal operation
4. DC/DC operates at lower input voltage when AC line fails
Typical Architecture of Switching Power Supply
Delta Electronics (Shanghai) Design Center
Efficiency Characteristic of Conventional Converters
Single-end Forward Converter
Dual-Switch Forward Converter
Half-Bridge DC/DC Converter
Full-Bridge DC/DC Converter
Asymmetric H/B DC/DC Converter
Phase-Shift F/B DC/DC Converter
SPRC Bridge DC/DC Converters
C
o
n
v
e
r
s
i
o
n
E
f
f
i
c
i
e
n
c
y
Input Voltage
Low Efficiency at High Input
High Efficiency at Low Input
High Effi.
@ Low-In
Low Effi.
@ High-In
Wanted Efficiency
Characteristics
Delta Electronics (Shanghai) Design Center
Ls
Cs
Cin
S1
S2
Co
Tr D1
D2
1. Whole range ZVS for switches and ZCS for rectifiers
2. Wide range operation and higher efficiency for higher input
3. 96% efficiency under variable frequency control
4. Magnetic integration and smaller size
LLC-Series Resonant Converter
--- LLC-SRC
Delta Electronics (Shanghai) Design Center
S1
S2
iLb
iLs
iC1
vc
vp iLm
Ls
CsS1
S2
TriC1
iLs
D1
D2
Co
iLb
Lm
vc vp
Cin
Mode I
Operation Analysis of LLC-SRC Converter
Delta Electronics (Shanghai) Design Center
S1
S2
iLb
iLs
iC1
vc
vp iLm
Ls
CsS1
S2
TriC1
iLs
D1
D2
Co
iLb
Lm
vc vp
Cin
Mode II
Operation Analysis of LLC-SRC Converter
Delta Electronics (Shanghai) Design Center
S1
S2
iLb
iLs
iC1
vc
vp iLm
Ls
CsS1
S2
TriC1
iLs
D1
D2
Co
iLb
Lm
vc vp
Cin
Mode III
Operation Analysis of LLC-SRC Converter
Delta Electronics (Shanghai) Design Center
S1
S2
iLs
iLb
iC1
Ls
Cs
Cin
S1
S2
Tr
iC1
iLs
D1
D2
Co
iLb
Typical Operation Current Waveforms:
Delta Electronics (Shanghai) Design Center
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.5 1 1.5
M
D
C
G
a
i
n r=2
r=4
r=6
r=8
8=r
6=r
4=r
2=r
Ω Rω
ω=Ω
sR
o
L
Rnr ω
2
=
( )R
s
min
o TTnC
I
n
VV −+=
42 RR TTT <<−
DC Gain vs. Switching Frequency
Delta Electronics (Shanghai) Design Center
---- H/B Converter with 400V Input and 48V 20A Output
Ls
Cs
Cin
S1
S2
Co
Tr D1
D2
S1,S2: IRFP37N50A C1: 470uF / 450V
D1,D2: 30CPQ150 Cs: 22nF *4
Tr: EE42/20 - 3F3 (14T:3T:3T) C3: 1000uF / 80V*6
Experimental Verification of LLC-SRC Converter
Delta Electronics (Shanghai) Design Center
91
92
93
94
95
96
97
98
Load Current (A)
C
o
n
v
e
r
s
i
o
n
E
f
f
i
c
i
e
n
c
y
300V
350V
400V
450V
300V 95.55 96.15 95.1 93.16
350V 95.72 96.45 96.13 95.35
400V 96.07 96.6 96.52 96.09
450V 96.17 96.82 96.86 96.52
5 10 15 20
@ 54 V
20Amp
Output
Tested Results: Conversion Efficiency
Delta Electronics (Shanghai) Design Center
91
92
93
94
95
96
97
Input Voltage (V)
E
f
f
i
c
i
e
n
c
y
(
%
)
LLC-SRC 94.6 95.4 96.1
LLC-SRC 91.8 93.2 94.2 95 95.2
Asy. H/B 95.1 94.4 93.5
200 250 300 350 400
400V
Input
@ 54 V
Output
Comparison with Asymmetrical H/B Converter
Delta Electronics (Shanghai) Design Center
0
20
40
60
80
100
120
Input Voltage(V)
F
r
e
q
u
e
n
c
y
(
k
H
z
)
Zero
Full
Zero 69 76.5 82.6 93 104
Full 60.2 67.3 73 82.5 89
300 330 350 380 400
@ 54 V
Output
Tested Results: Frequency Changing
Delta Electronics (Shanghai) Design Center
300Khz Switching
Schuttky Diode Rectifiers
250v-400v Input Range Operation
>20mS Hold-up Time Design
47u Bus Capacitor
EFD25 Core for Transformer
Ls
CsS1
S2
Tr
D1
D2
Co
Lm
IM
400v Input
LLC-SRC with Diode Rectifier
100Khz Switching
Synchronous Rectifiers
380v-400v Input Range Operation
<1mS Hold-up Time Design
68u Bus Capacitor
PT30/19 Core for Transformer
400v Input
Ls
CsS1
S2
Tr
D1
D2
Co
Lm
IM
Ld
AHB with Synchronous Rectifier
Early Stage Demonstration Design
86.00
87.00
88.00
89.00
90.00
91.00
92.00
Input Voltage (V)
E
f
f
i
c
i
e
n
c
y
(
%
)
AHB 88.85 90.20 90.50 90.80 91.00 91.60
LLC-SRC 88.60 89.90 90.60 90.90 91.20 91.60
90v 120v 150v 180v 220v 260v
60
65
70
75
80
85
90
95
Load Current (A)
E
f
f
i
c
i
e
n
c
y
(
%
)
effi. (%) 64.2 72.5 79.9 87.7 90.1 90.8 91.2 91.1
0.26 0.45 0.75 1.75 2.75 3.75 4.75 5.75
---- High Efficiency & Low Cost Adapter
Delta Electronics (Shanghai) Design Center
---- Symmetrical Half-Bridge LLC-SRC DC/DC Converter
Early Stage Demonstration Design
1kw AC/DC converter
Size: 330*120*70 mm
Frequency: 150kHz
Efficiency: 81%~87%
Power density: 6W/inch3
Size: 220*120*40 mm
Frequency.: 340kHz
Efficiency: 85%~91%
Power density: 15W/inch3
Ls
Cs1
Cin
S1
S2
Co2
Tr D1
D2
Co
Ld
Cs2
Delta Electronics (Shanghai) Design Center
LLC-SRC Topology Extensions
Ls
Cs
Cin
S1
S2
CoTr D1
D2
LsCin
S1
S2
Tr D1
D2
Co
Cs1
Cs2
LsCin
S1
S2
Tr
Cs1
Cs2 SR1
Co
SR2
Ls
Cs
Cin
S1
S2
Tr
Co
SR2SR1
Delta Electronics (Shanghai) Design Center
Ls
Cs
Cin
S1
S2
Tr D1
D2
Co
S3
S4
Ls
Cs
Cin
S1
S2
Co
Tr
S3
S4
D1
D2
D3
D4
Ls
Cs
Cin
S1
S2
Co1
Tr
S3
S4
D1
D2
D3
D4
Co2
Ls
Cs
Co
Tr
D1
D2
Cin1
S1
S2
S3
S4
Cin2
LLC-SRC Topology Extensions
Delta Electronics (Shanghai) Design Center
Application for High Density Modular Converter
32.0 x 21.5 x 6.0
778W/in3 & 12.3g
58.4 x 22.8 x 11.2
218W/in3 & 31.8g
Delta Electronics (Shanghai) Design Center
Application for High Efficiency LED Power
Input
Filter
LLC-SRC
With SR
Interleaved
Boost PFC
Buck
Cap.
Output
Filter
Ls
400
Vdc
S1
S2
12/24
Vdc
Tr
SR1SR2
Cs1
Cs2
Delta Electronics (Shanghai) Design Center
Application for Golden/Platinum Sever Power
Input
Filter
LLC-SRC
With SR
Interleaved
Boost PFC
Buck
Cap.
Output
Filter
Ls
S1
S2
12
Vdc
Tr
400
Vdc
SR1SR2
S1
S2
Cs
72.0
74.0
76.0
78.0
80.0
82.0
84.0
86.0
88.0
90.0
92.0
94.0
96.0
Output Current (A)
E
f
f
i
c
i
e
n
c
y
(
%
)
230Vac-I 74.0 85.0 90.0 89.5
110Vac-I 72.0 82.0 86.0 85.5
230Vac-II 88.4 92.5 94.3 93.3
110Vac-II 84.2 89.5 91.9 90.7
10% 20% 50% 100%
80 Plus
Delta Electronics (Shanghai) Design Center
230Vac/50Hz
87
88
89
90
91
92
93
94
95
96
97
10
%
20
%
30
%
40
%
50
%
60
%
70
%
80
%
90
%
10
0%
Ouput Current (A)
E
f
f
.
(
%
)
Application for High Efficiency Rectifier
Ls
Cs
400
Vdc
S1
S2
48
VdcTr
S3
S4
SR3SR1
SR4SR2
Input
Filter
LLC-SRC
With SR
Interleaved
Boost PFC
Buck
Cap.
Output
Filter
Delta Electronics (Shanghai) Design Center
Application for PHEV/EV AC/DC Charger
Input
Filter
LLC-SRC
Converter
Interleaved
Boost PFC
Buck
Cap.
Output
Filter
Ls
Cs
400
Vdc
S1
S2
300
Vdc
Tr
S3
S4
D1
D2
D3
D4
Delta Electronics (Shanghai) Design Center
Application for High Efficiency Solar Inverter
Ls
Cs
500
Vdc
S1
S2
400
Vdc
Tr
S3
S4
D1
D2
D3
D4
Pre-Reg.
Boost
HF DC
Transformer
HF
Inverter
95.0
96.0
97.0
98.0
99.0
Load (%)
E
f
f
i
c
i
e
n
c
y
(
%
)
Effi. 96.6 98.0 98.6 98.8 98.8 98.4
5% 10% 20% 30% 50% 100%
Delta Electronics (Shanghai) Design Center
THANK YOU
WELCOME TO VISIT US
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WELCOME TO VISIT US
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