switch mode power supply - iea
TRANSCRIPT
![Page 1: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/1.jpg)
IE
Switch mode power supply
230 Vac 50 Hz
15 Vdc
Low frequency (50 Hz)
rectifying High frequency AC generation
Isolation, Adopting voltage
Stabilize DC-voltage
High frequency rectifying
![Page 2: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/2.jpg)
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Switch mode power supply Transformer definition
V1 N1 N2 V2
=
=
=
2
2
1
2
1
1
2
2
1
2
1
2
1
NN
ZZ
NN
II
NN
VV
![Page 3: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/3.jpg)
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Switch mode power supply Transformer
φm φ1
φ2
![Page 4: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/4.jpg)
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Switch mode power supply Transformer equivalent circuit
reduced to one side
φ1 φ2
φM
![Page 5: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/5.jpg)
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Forward converter
vC Rload
VDc Cdc
vS
C D2
D1 D3
Z
VD1
L
S
N1 N2
![Page 6: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/6.jpg)
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Forward converter at turn on
vC Rload
VDc Cdc
vS
C D2
D1 D3
Z
VD1
L
N1 N2
Turn on
![Page 7: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/7.jpg)
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Forward converter at turn off
vC Rload
VDc Cdc
vS
C D2
D1 D3
Z
VD1
L
N1 N2
Turn off
![Page 8: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/8.jpg)
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Fly-back converter vD
vC
VDc Cdc
vS
C
![Page 9: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/9.jpg)
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Fly-back converter at turn on
vD
vC
VDc Cdc
vS
C
Turn on
![Page 10: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/10.jpg)
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Fly-back converter at turn off
vD
vC
VDc Cdc
vS
C
Turn off
![Page 11: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/11.jpg)
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Fly-back converter Transformer snubber
vC C
![Page 12: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/12.jpg)
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Fly-back converter Switch snubber
vC C
![Page 13: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/13.jpg)
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Fly-back converter Diode snubber
vC C
![Page 14: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/14.jpg)
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Fly-back converter RCD snubber at turn off
Leakage inductance requires a freewheeling path
![Page 15: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/15.jpg)
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Switch mode power supply Transformer
φm φ1
φ2
![Page 16: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/16.jpg)
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Fly-back converter RCD snubber at turn on
Transformer leakage inductance requires a freewheeling path. Design of capacitor C i based on voltage over C
C
stUCtIUCQechtoTime
FC
VUHL
AIExample
UILCWWequalEnergies
UCWCinenergyElectric
ILWenergyMagneticUvoltagecapacitorAllowed
em
e
m
µ
µ
µ
6610
151044arg
44151010
1510010
6
24
2
221
221
<⋅⋅
=⇒⋅=⋅⇒⋅=
=
⋅=
=∆==
∆
⋅=⇒=
∆⋅⋅=
⋅⋅=
∆
−
−
![Page 17: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/17.jpg)
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Fly-back converter RC snubber over main switch
Needed due to fast switching and stray inductance
![Page 18: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/18.jpg)
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Fly-back converter Diode snubber
vC C
vC C
![Page 19: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/19.jpg)
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Fly-back converter Rectifier
![Page 20: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/20.jpg)
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Fly-back converter Common mode filter
![Page 21: Switch mode power supply - IEA](https://reader030.vdocuments.pub/reader030/viewer/2022012414/616e09c6bd766258a674ce4f/html5/thumbnails/21.jpg)
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Fly-back converter. Inrush current limitation
T-
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Fly-back converter Differential mode filter
T-