Buck/Boost Converter
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Switching Converter PowerPoint PPT Presentation


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Buck/Boost Converter. Boost Converter. Switching Converter. Buck Converter. I IN. I O. + V OUT -. + V IN -. Buck-Boost Converter : Inductor Current. i L. i L,max. m 1. m 2. I L. I L,crit. i L,min. t 1 =DT S. t 2 =(1-D)T S. T S = t 1 +t 2.

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Switching Converter

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Switching converter

Buck/Boost Converter

Boost Converter

Switching Converter

Buck Converter

IIN

IO

+

VOUT

-

+

VIN

-


Switching converter

Buck-Boost Converter : Inductor Current

iL

iL,max

m1

m2

IL

IL,crit

iL,min

t1 =DTS

t2 =(1-D)TS

TS = t1+t2


Switching converter

Buck-Boost Converter : Switch Current

iL

iL,max

IL

DIL

iL,min

t1 =DTS

t2 =(1-D)TS

TS = t1+t2


Switching converter

B/B Converter : Forward Diode Current

iD = -iO

iL,max

IL

DIL

iL,min

t1 =DTS

t2 =(1-D)TS

TS = t1+t2


Switching converter

B/B Converter: Capacitor Current – High Po

-iC

DIL

+ DQ

0

- DQ

IO

t1 =DTS

t2 =(1-D)TS

TS = t1+t2


Switching converter

B/B Converter: Capacitor Current – Low Po

iD

tx

IL,max

DIL

+ DQ

0

  • - DQ

IO

t1

t2

TS = t1+t2


Switching converter

Switching Converter Parameters

Reverse diode for VIN < 0

DCM if IO/IO,cr < 1


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