switching converter boost converter buck/boost converter buck converter + v in - + v out - i in ioio

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Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN I O

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Page 1: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

Switching ConverterBoost ConverterBuck/Boost ConverterBuck Converter

+VIN-

+VOUT-

IIN IO

Page 2: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

iL

iL,max

iL,min

IL,crit

IL

TS = t1+t2

t1 =DTS t2 =(1-D)TS

m2m1

Buck-Boost Converter : Inductor Current

L

Vm IN1 L

Vm O2

Lf

DVI IN

L

D

DVV

DVDV

INO

OIN

1

1

INO

O

VV

VD

LfVV

VVI

INO

INOcritL 2,

Page 3: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

iL

IL

iL,max

iL,min

TS = t1+t2

t1 =DTS t2 =(1-D)TS

Buck-Boost Converter : Switch Current

DII LIN

IL

Page 4: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

iD = -iO

IL

iL,max

iL,min

TS = t1+t2

t1 =DTS t2 =(1-D)TS

B/B Converter : Forward Diode Current

DII LO 1

IL

Page 5: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

-iC

IL

IO

TS = t1+t2

t1 =DTS t2 =(1-D)TS

B/B Converter: Capacitor Current – High Po

0

- Q

+ Q

f

DIQ O

C

QV ppO

,

INOcrOO VVIP ,

Page 6: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

iD

IL

IO

TS = t1+t2

t1 t2

B/B Converter: Capacitor Current – Low Po

0

Q

+ QIL,max

tx

,max

2

L Ox

L

I It

t I

fI

IIDIItQ

L

OLOLx

2

1

2

2max,max,

INOcrOO VVIP ,

Page 7: Switching Converter Boost Converter Buck/Boost Converter Buck Converter + V IN - + V OUT - I IN IOIO

,2 O O crI I

,O O crI I

,O O cr O INI I V V

,2 IN IN crI I ,2 O O crI I

,O O crI I,O O crI I

,O O crI I ,O O crI I

Reverse diode for VIN < 0 DCM if IO/IO,cr < 1

Switching Converter

Parameters

crOO II ,1