Lecture 6 - EEL 5245 Power Electronics I Lecture 6...

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1 EEL 5245: Power Electronics I Lecture # 6 Non-Isolated Dc-dc Converters Insturctor: Dr. Sam Abdel-Rahman School of Electrical Engineering and Computer Science University of Central Florida
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2 CCM Buck-Boost Converter Mode 1: S on Mode 2: S off Note that buck-boost is an inverting converter (output is negative) Mode 1: Mode 2: 0 DT DT T Switch and diode voltage stress= Vin + Vo
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3
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4 (from mode 1) (from mode 2) Using the above two equations, or using volt-second balance 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 1 2 3 3 0 MD () 1 0D M>1 M<1 M=1
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5 1 - D : D
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6 Min & Max inductor current Critical inductor Converter enters DCM when inductor current reaches zero find critical Io?
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7 CCM Buck-Boost Output voltage ripple Use capacitor charge o o c c o QD T I DTV V CR V D VR C f ∆= = find v c (t)?
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8 DCM Buck-Boost Converter Mode 1: S on Mode 2: S off Mode 3: S & D off Mode 1: Mode 2: 0 DT DT D 1 T D 1 T T Mode 3: () 0 Lc o it I == Switch and diode voltage stress= Vin + Vo
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9 () L Vin I DT DT L = 11 0 ( ) LL Vo ID T D D TID T L == +
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This note was uploaded on 10/05/2010 for the course EEL 5245 taught by Professor Abdel-rahman during the Fall '10 term at University of Central Florida.

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Lecture 6 - EEL 5245 Power Electronics I Lecture 6...

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