Cuk dc dc+converter-ii(1)

PowerPoint

DC-DC Converter(II)(Buck-Boost & Cuk)

March. 24. 2011

Presented by Won-yong SungEnergy Mechatronics Lab.School of Information and Communication Eng.Sungkyunkwan Universityhttp://seml.skku.ac.kr

Sungkyunkwan Univ., Energy Mechatronics Lab.#Buck-Boost Converter

Step-DownStep-UpStep-Down/Up

Sungkyunkwan Univ., Energy Mechatronics Lab.#

Mode Analysis - 1Switch on, Diode off - Inductor current increases - Diode Voltage -

Buck-Boost Converter(CCM Analysis)


Mode Analysis - 2Switch off, Diode on - Inductor current decreases - Switch Voltage -



Buck ModeBoost Mode



Inductor Current Analysis



Inductor Current AnalysisBuck-Boost Converter(CCM Analysis)


Capacitor Voltage Analysis



Buck-Boost Converter

Boundary Conduction Mode


Discontinuous Conduction Mode


Simulation


Buck-Boost Converter

Simulation

L=1280uF>640uF=> CCML=640uF=640uF=> BCML=320uF DCM

Sungkyunkwan Univ., Energy Mechatronics Lab.#Cuk ConverterBuck-Boost


Cuk Converter Switch OFF / Diode ON

Mode Analysis - 1


Cuk Converter Switch ON / Diode OFF

Mode Analysis - 2


Buck ModeBoost ModeCuk Converter


Cuk Converter


Cuk Converter


Cuk Converter


Cuk Converter


Cuk Converter


Cuk Converter


SimulationCuk Converter


SimulationCuk Converter

Sungkyunkwan Univ., Energy Mechatronics Lab.#D

10

8

4

2

0

Gv

0.2

0.4

6

0.6

0.8

1

iD

t

Imax

Imin

DT

T

iS

Imax

Imin

t

DT

T

iL

t

Imax

Imin

DT

T

iD

t

Imax

Imin

DT

T

iS

Imax

Imin

t

DT

T

iL

t

Imax

Imin

DT

T

Io=Vo/R

-Io

iC

t

DT

T

Io

iD

t

Imax

Imin

DT

T

t

DT

T

vC-Vo

vo

D

10

8

4

2

0

Gv

0.2

0.4

6

0.6

0.8

1

t

t

iC1

t

Imax1

Imin1

- Imax2

- Imin2

DT

T

vC1 VC1

vC1

t

iC2

(Imax2 Imin2)

1

2

(Imax2 Imin2)

1

2

t

vC2 - Vo

vo

DT

DT

T

T

Engineering

Cuk dc dc+converter-ii(1)