Switch mode power supply - IEA

22
IE Switch mode power supply 230 V ac 50 Hz 15 V dc Low frequency (50 Hz) rectifying High frequency AC generation Isolation, Adopting voltage Stabilize DC-voltage High frequency rectifying

Transcript of Switch mode power supply - IEA

Page 1: Switch mode power supply - IEA

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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

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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

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Switch mode power supply Transformer

φm φ1

φ2

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Switch mode power supply Transformer equivalent circuit

reduced to one side

φ1 φ2

φM

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Forward converter

vC Rload

VDc Cdc

vS

C D2

D1 D3

Z

VD1

L

S

N1 N2

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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

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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

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Fly-back converter vD

vC

VDc Cdc

vS

C

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Fly-back converter at turn on

vD

vC

VDc Cdc

vS

C

Turn on

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Fly-back converter at turn off

vD

vC

VDc Cdc

vS

C

Turn off

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Fly-back converter Transformer snubber

vC C

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Fly-back converter Switch snubber

vC C

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Fly-back converter Diode snubber

vC C

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Fly-back converter RCD snubber at turn off

Leakage inductance requires a freewheeling path

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Switch mode power supply Transformer

φm φ1

φ2

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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

<⋅⋅

=⇒⋅=⋅⇒⋅=

=

⋅=

=∆==

⋅=⇒=

∆⋅⋅=

⋅⋅=

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Fly-back converter RC snubber over main switch

Needed due to fast switching and stray inductance

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Fly-back converter Diode snubber

vC C

vC C

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Fly-back converter Rectifier

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Fly-back converter Common mode filter

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Fly-back converter. Inrush current limitation

T-

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Fly-back converter Differential mode filter

T-