switching converter boost converter buck/boost converter buck converter + v in - + v out - i in ioio
TRANSCRIPT
Switching ConverterBoost ConverterBuck/Boost ConverterBuck Converter
+VIN-
+VOUT-
IIN IO
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,
iL
IL
iL,max
iL,min
TS = t1+t2
t1 =DTS t2 =(1-D)TS
Buck-Boost Converter : Switch Current
DII LIN
IL
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
-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 ,
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 ,
,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